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Reasons for the frosting of the compressor of the high and low temperature alternating damp heat test chamber
Occasionally, some customers report that the compressor of the high and low temperature alternating damp and heat test chamber will be frosted and frozen. In fact, this is not an equipment problem, as long as we pay attention to maintenance work, it can be avoided!
1. After the technical tube of the high and low temperature alternating damp heat test chamber was opened, it was not sealed or repaired in time. There is also a type of compressor that has been left for a long time and is prone to frost when it is used without drying.
2. The refrigeration evaporator may be damaged. In addition, after a long time start, the water molecules in the freezer compartment will be carried into the compressor together with the water vapor in the air.
3. When the evaporator is poorly ventilated, if the cold is not taken away, it will also cause frosting and freezing, and the compressor pressure will be too low, resulting in frosting of the compressor shell.
4. When the test chamber is in normal working condition, the compressor sucks back refrigerant vapor instead of liquid. If there is too much refrigerant and refrigerating oil in the refrigeration system, or the flow rate adjusted by the expansion valve is too large, frosting will also occur.
5. In the case of aging failure, the filter drier loses its drying and water absorption capacity. The inability to absorb water vapor inside the compressor can also cause frost.
The above points may cause frosting in the compressor of the high and low temperature alternating damp heat test chamber, so users should pay more attention to these problems when using them, and do a good job of maintenance and repair.
Sunlight carbon arc aging machine (domestic)
UV Carbon Arc weather Meter
UV Aging Test Chamber
Ozone resistance testing machine function
The ozone resistance tester is used to test the resistance to cracking of rubber products such as vulcanized rubber, thermoplastic rubber, and cable insulation sheaths in an ozone environment. The ozone resistance testing machine can control and adjust the concentration of ozone environment to determine the ozone resistance of the test piece.
The content of ozone in the atmosphere is very small but it is the main factor of rubber cracking. The ozone resistance testing machine simulates and strengthens the ozone conditions in the atmosphere, and quickly identifies and evaluates the rubber anti-ozone aging performance and anti-ozone agent protection efficiency methods, and then adopts Effective anti-aging measures to improve the service life of rubber products.
According to the test methods and standards, it can be divided into "static" and "dynamic". Static means that the sample is stretched and placed in the test box for testing, while dynamic means that the sample is placed on the fixture of the test box and stretched while doing the test. In the test, the tensile fluctuation is about 5%-45% of the tested sample itself.
How to choose the right xenon lamp aging tester
ging detection
Aging detection is a process of simulating various factors involved in the actual use conditions of the product to carry out corresponding conditions and strengthening experiments. This experiment is mainly for plastic materials. Common aging mainly includes light aging, damp heat aging, and hot air aging. . The product is used outdoors for a long time under the sun. If you want to know the life of the product can be used outdoors, it is necessary to simulate the sun's ultraviolet light to perform a UV aging experiment. Of course, the intensity of the experiment is much greater than the actual outdoor light intensity, thus shortening the test time , You can understand the aging status of the product after how many years of use through a short-term test.
Aging detection test range
Plastic/rubber products (including PP, PVC, natural rubber, etc.), especially product plastic shells, plastic fasteners, etc.
Coating/adhesive products (industrial coatings, architectural coatings), especially coatings for outdoor use.
Outdoor decorations (including outdoor light boxes, outdoor electroplating parts, etc.). More test ranges should be determined according to specific test requirements.
The breakdown of products that can be tested by aging test is as follows:
The aging test of plastic products includes: plastic particles, plastic wires, plastic ropes, plastic belts, hoses, rigid pipes, corrugated pipes, plastic sheets, plastic films, plastic switches, plastic doors and windows, plastic rods, artificial leather, cables, foam materials, plastics Profiles, car accessories, etc.
Rubber products aging tests include: hoses, sealing rings, films, conveyor belts, sealing strips, insulating sheaths, tires, rubber pads, hoses, conveyor belts, rubber materials, waterproof membranes, car accessories, etc.
Coating adhesive aging tests include: anti-corrosion coating, waterproof coating, heat insulation coating, high temperature resistant coating, conductive coating, potting adhesive, self-adhesive, hot melt adhesive, universal adhesive, etc.
Metal salt spray test materials: steel, metal components, etc.
Specification for flammability test of building materials and products
Canadian Requirements for the Combustibility of Building Mat
Chemical test items for footwear and leather products
my country is the world’s largest textile producer and exporter. As people’s living standards continue to improve, consumers’ quality requirements for textile, apparel, shoes and leather products have evolved from a single product comfort, functionality, and safety to a whole Every stage of the industrial chain, from raw materials to finished products, must protect public health and safety.
Footwear and leather products use a lot of chemical materials in the manufacturing process, and these materials are often the source of harmful substances. In order to avoid the potential hazards of footwear and leather products to human health, it is an inevitable requirement to limit the content of harmful substances such as formaldehyde, azo dyes, extractable heavy metals, and phthalates.
In addition, in recent years, my country's footwear and leather products have been recalled due to excessive harmful substances. Only by testing these products for harmful substances can we avoid trade risks to the greatest extent.
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Air Permeability Tester[/url]
How do I connect through VoIP?
There are three main types of connectivity options for VoIP:
Analog Telephone Adapter (ATA) – A device used to physically connect an existing analog telephone to a VoIP network. ATAs usually have multiple phone jacks and an Ethernet network connection, though some perform analog-to-digital conversion and connect directly to a PBX.
Internet Protocol Phones (IP Phones) – Phones designed specifically for use in a VoIP system. Like our Rhynotel handsets, IP phones accept the digital signal directly and have a variety of features at easy access that standard analog phones may lack such as Follow Me, Call Parking and Do Not Disturb, at the push of a button. IP phones are also plug-and-play in that they can be moved from one location to another on your network easily while keeping the same number.
Softphones - A softphone is a software program that enables you to make VoIP calls using your computer in lieu of your office handset. If you have an internet-connected laptop or mobile device, a softphone is accessible wherever you have the device, giving you the ability to make and receive calls from your office phone number without giving your private or mobile number.
How Much does a VOIP Phone System Cost
New Rock MX 8G for a Spain Laboratory
Hotel Voip IP PBX System
How VoIP / Internet Voice Works
VoIP services convert your voice into a digital signal that travels over the Internet. If you are calling a regular phone number, the signal is converted to a regular telephone signal before it reaches the destination.
VoIP can allow you to make a call directly from a computer, a special VoIP phone, or a traditional phone connected to a special adapter. In addition, wireless "hot spots" in locations such as airports, parks, and cafes allow you to connect to th
Enterprise IP voice communication system
Frequency conversion series air compressor chemical industry
Chemical industry in the production process often uses and produces corrosive gases, liquids and dust, a large number of flammable and explosive dangerous substances, as well as irritant, polluting and other toxic substances, so chemical plants are mostly built on water. In the design of building structure and production equipment will be considered in all aspects of anti-corrosion, fire, explosion-proof measures. With the rapid development of science and technology, modern chemical plants mostly use energy-saving, intelligent regulation and centralized control of chemical equipment.
Clean and stable compressed air is indispensable in the complex production process of chemical plant. The compressed air from the air compressor is compressed and discharged into clean and stable gas after passing through a set of precise post-treatment system of gas storage tank, dryer and filter, and then divided into two pipelines: one is used to drive some pneumatic equipment, the other is used to produce nitrogen and chemical raw materials. Therefore, a high quality air compressor and post-treatment system will be directly related to the production process of the whole chemical plant.
Waste heat recovery of air compressor
Air compressor in the process of work produces very large heat energy, but let it white out to the air is a very pity, so there is what we call air compressor waste heat recovery. The waste heat recovery of air compressor is to transfer the heat of high temperature oil of air compressor to cold water through superheat exchange technology. The cold water is heated and flows into the heat preservation water tank, so as to achieve the purpose of heat recovery.
Because 73% of the heat energy of the air compressor is in the oil, and the technical treatment and heat exchange of the oil will produce a continuous stream of hot water, that is, the air compressor can work under constant temperature, and can meet the needs of the factory or life of hot water, kill two birds with one stone, and the hot water generated by the waste heat recovery technology of air compressor does not need any additional cost, which reduces the cost Less investment by factories to make hot water. Air compressor waste heat recovery is a very environmental protection and energy saving way.
Dry screw vacuum pump
The screw vacuum pump has a recovery system, which is fully in line with the concept of energy conservation and environmental protection, and is more widely used. But why is the market share of dry-type screw vacuum pump not high? In addition to the price plateau, there are also users who do not have a good understanding of the dry vacuum pump and can not see the future economic benefits brought to the enterprise. This paper focuses on how to optimize the selection of dry vacuum pump?
For these different types of dry vacuum pump, we are eager to be able to reduce its physical size. But this is in contradiction with the pumping rate of the vacuum pump, because the pumping rate of the vacuum pump is directly proportional to the volume of the vacuum pump. Small physical size means small volume. Of course, there is also an important factor that affects the pumping rate of vacuum pump, that is, the rotational speed. In order to match the pumping rate of small size vacuum pump with that of large size vacuum pump, it is necessary to increase its speed.
There are two ways to change the speed of vacuum pump, one is to change the frequency of power supply, that is to use frequency converter; the other is to change the transmission ratio of gearbox. The advantage of frequency converter is that it can provide a closed-loop control, but it is easy to cause torque loss under heavy load. Changing the gear ratio of the gearbox is a very economical method. Of course, it can only provide a single speed which is not controllable.
Application of magnetic drive pump in medical device
The pharmaceutical field occupies a very important position in the national economy. In the process of pharmaceutical production, the medium such as liquid medicine, intermediate, pure water, acid and reducing agent is transported by pump to meet the requirements of process production. According to the different devices and transport media, some typical medical devices in China. Generally, centrifugal pump, rotor pump, metering pump and vacuum pump are selected. Centrifugal pump accounts for 90% of the total medical pump. The magnetic drive pump itself has the characteristics of no leakage, zero pollution and environmental protection, which is very suitable for the pharmaceutical industry.
The pharmaceutical industry is a special industry. Due to the complex characteristics of the medium in the pharmaceutical production process (most of the pumps are used for the transportation of toxic, harmful, flammable, explosive and corrosive media), the magnetic pump, as a key supporting equipment, has attracted more and more attention. Its particularity is mainly shown in the following aspects.
(1) The quality of pumps for medical devices is very strict. Although petroleum, chemical and other industries also have quality requirements, it is difficult to compare with drugs. The quality of drugs must meet the requirements of Pharmacopoeia and GMP of the people's Republic of China. Pumps for medical devices should also meet GMP requirements.
(2) Pharmaceutical industry has high requirements in all aspects of the production process. In drug production, flammable, explosive, toxic and harmful solvents and intermediates are often encountered. Therefore, the pump used in medical device must be selected according to the medium and application situation.
Application advantages of horizontal multistage centrifugal pump
What do you know about horizontal multistage centrifugal pump? As the name implies, it lies on the ground, is a multi-stage centrifugal pump, this pump is made of stainless steel, so it is also one of the stainless steel centrifugal pumps, with very high efficiency, and the multi-stage performance makes its use range is very wide, not only safe, but also very stable. No matter you can't understand it, it doesn't matter. Next you will have a chance to contact it comprehensively, hoping to help you.
The horizontal multi-stage centrifugal pump is different from the single-stage centrifugal pump. When it works, the noise is very small. Therefore, this kind of pump is common in the roof of high-rise buildings in cities. The volume of the whole pump is very large, and the multi-stage diversion is used for water supply and drainage of factories and mines, long-distance water delivery, domestic water supply and so on.
Because of the powerful function of horizontal multi-stage centrifugal pump, it is necessary to pay special attention to the installation, because a little carelessness will lead to work errors and bring great losses. In this regard, if you are doing homework, please pay attention to the following aspects. First, because the weight of the whole pump is very large, so do not repeat the superposition when splicing the pipeline, resulting in the pump bearing too much pressure to avoid damage to the centrifugal pump. Second, when installing, we must tighten all parts, and often check the key points. The centrifugal pump will produce large vibration during operation, which will have a greater impact on all parts. Once it is not solid, it is likely to crack and other damage. Third, it is necessary to ensure that there is no hard material in the pump flow channel before operation, because accidents are easy to occur under rapid movement.
Electric mode of electric diaphragm pump
In real life, the use of electric diaphragm pump is also relatively common. In many occasions, the diaphragm pump with electric characteristics will be used. It breaks the traditional application mode, has certain electric performance and automation performance, and is very small in volume, especially light in weight, and easy to move and install. It has no complex control system, and there is no computer and fuse wait.
This ensures its safety. The diaphragm pump can be used in various industries, such as chemical industry, petroleum industry, coating industry, daily chemical industry, mining industry, water treatment industry and food industry. And in the modern furniture industry and metallurgical casting industry can also be used, without any negative impact.
And this kind of electric diaphragm pump can always maintain a high efficiency, not because of wear and tear and reduce its use efficiency, do not need lubricating oil for lubrication, its maintenance is very simple and convenient, there will be no dripping pollution of the working environment.
Roots Blower Anti Corrosion And Rust Removing Methods
Cleaning method of water ring vacuum pump
After using the water ring vacuum pump for a long time, it is inevitable that the pump body will be contaminated with some dust and other impurities. If these impurities enter into the pump, it will seriously affect the service performance of the water ring pump. Therefore, the user needs to clean the pump regularly. The water ring vacuum pump manufacturer introduces the following cleaning methods for us.
1. Clean the rolling bearing of water ring vacuum pump with gasoline, and wait for it to dry or blow dry after cleaning.
2. Clean the pump parts with anhydrous kerosene, and then wipe them with cotton cloth to ensure that there is no cotton fiber left on the parts.
3. Place diluted nitric acid or other soluble substances in the container and wait for about one hour, and then wash them with clear water directly. If there is pressure, the effect will be better.
The long-term use of water ring vacuum pump is inseparable from its regular cleaning and maintenance. Its cleaning operation includes not only external cleaning, but also internal cleaning. If the residual substances in the parts are not cleaned in time, they will mix into the newly changed lubricating oil, which will affect the oil quality and lubrication effect. Therefore, the user should pay attention to the cleaning operation of the pump.
The reason of noise of water ring vacuum pump and its solution
Many users report that their own water ring vacuum pump often produces noise in the process of use, and the higher the pumping rate and vacuum degree of the pump, the greater the noise. The following content for you to introduce the cause of the water ring pump noise and specific solutions, you can refer to!
1. Large noise of the motor: if the noise of the water ring vacuum pump is caused by the large noise of the motor, the motor with low noise can be selected or the motor acoustic cover can be added.
2. Loud noise caused by installation: check whether the equipment foundation is installed firmly to avoid vibration; the motor shall be aligned with the pump coupling to avoid noise and vibration caused by insufficient connection accuracy.
3. Noise caused by vent of exhaust port: if noise is caused by this problem, muffler can be installed at the outlet.
4. The vacuum pump works under the limit vacuum: the limit vacuum of the water ring pump disc distribution board structure vacuum pump is 33hpa (absolute pressure), which will vibrate and increase the noise when it works at 50hpa generally. The limit vacuum of the water ring pump of the vertebral body distributor structure is 100hPa (absolute pressure), which will vibrate and increase the noise when it works at 110hpa generally. Therefore, we should correctly select the vacuum pump and avoid working at the extreme Vacuum limit.
5. Mechanical friction: we should often remove scale to avoid excessive noise caused by mechanical friction.
When the noise of the water ring vacuum pump is too loud in use, we should find out the cause of the noise in time, so that we can take targeted measures to solve the problem.
Introduction of heat dissipation mode of water ring vacuum pump
When the water ring vacuum pump draws vacuum in the fields of petroleum, chemical industry, medicine and so on, due to the high working pressure, it will produce certain heat. If the heat can't be dissipated in time, it will affect or even damage the internal parts of the pump for a long time. At this time, we will take an effective way to dissipate heat, which is determined according to the heat of different parts of the pump body Now, the water ring vacuum pump manufacturer will introduce it to us!
1. Add lubricating oil: since the working vacuum of water ring vacuum pump is not very high, generally, 46 mechanical oil can be used to replace the vacuum pump oil. Generally speaking, before start-up, the oil level in the oil window at both ends of the pump shall not be less than 2 / 3 of the height of the oil window, and shall not be less than 1 / 2 of the height during operation.
2. Use of the unit composed of the front-end pump: the main pump of the unit is water ring vacuum pump, and other mechanical vacuum pumps such as liquid ring vacuum pump, rotary vane vacuum pump and slide valve vacuum pump are the front-end pumps. The automatic operation, automatic overheating and overload protection of the unit are achieved through various vacuum instruments and control equipment. According to different process requirements and different configuration of the front stage pump, the pump can be composed of one or more pumps and the front stage pump.
Heat dissipation is conducive to slowing down the use pressure of the water ring vacuum pump, prolonging the service life of the pump and improving the working efficiency of the pump. Therefore, when using the water ring vacuum pump, we should choose the appropriate heat dissipation mode to ensure that the pump can be used for a long time.
Electric High Vacuum Butterfly Valve Selection Guide
The water softener is made of glass fiber reinforced plastic and stainless steel. We recommend the use of stainless steel water softener, mainly because of the reason: the glass fiber reinforced plastic water softener on the market now uses the control valve interface to feed and discharge. The control valve must be removed for the filter material. If the water softener is years old, the joints will easily break when they are disassembled, causing unnecessary losses, and it is not convenient to remove the original resin from the top, and the side of the stainless steel water softener can be opened. It is easy to use the inlet and outlet without removing the automatic control head. There are also high-grade stainless steel materials, the disadvantage is that the cost is relatively high compared to glass fiber reinforced plastic water softeners.
Related products:
Vacuum Pump
How to select vacuum pump correctly for vacuum packaging machine?
At present, many customers in the purchase of vacuum packaging at the same time of the selection of vacuum pump is unclear, vacuum packaging machine in general with what vacuum pump?
Vacuum pump is the core part of the vacuum packaging machine and the center of the vacuum packaging machine. It has a great influence on the packaging effect, service life and failure rate during the use of the vacuum packaging machine. How to select vacuum pump correctly for vacuum packaging machine?
The domestic vacuum pump generally refers to the vacuum pump produced by a wholly domestic enterprise, which is characterized by low price and general quality. In the process of use, the vacuum effect is not obvious and the use performance is not stable. But the general small vacuum packaging machine can use the domestic vacuum pump. Because the vacuum chamber of the small vacuum packaging machine is small, the vacuum effect can achieve the effect of vacuumizing in a small range of space and time, so it is no problem to use the general vacuum pump.
If some users choose medium-sized or large-scale vacuum packaging machines, small editors suggest using joint venture vacuum pumps or imported vacuum pumps. After all, as the equipment needed for production, the performance, service life and failure rate of vacuum packaging machines can directly meet the current production needs. In addition, domestic vacuum pumps are more suitable for small-scale production and large-scale production It is not recommended for mass production.
What about the leakage rate of water ring vacuum pump?
With the development of vacuum industry, water ring vacuum pump has been widely used. In use, the most difficult problem for users is to detect the leakage rate of water ring vacuum pump. And it includes internal leakage and external leakage. The external leakage is better to detect, while the internal leakage is more difficult to handle. Here is a brief introduction to the leakage rate detection of the water ring vacuum pump:
1. Most of the internal leakage occurred on the equipment with water-cooled jacket. No doubt was found through checking the external leakage, but there were the following phenomena: the pumping speed of the mechanical pump was obviously low, the indication value of the vacuum gauge was low, the mechanical pump oil was quickly emulsified, and the iron-based parts in the vacuum chamber were obviously rusted. If the above conditions are met, internal leakage can be basically determined. Clean the inner wall first, and then pass cooling water to see if there is any wet point. The wet point is the leakage point.
2. Small leakage and micro leakage are difficult to check. The commonly used method is to use the ionization tube sensitive to some gases in high vacuum state to detect leakage, such as acetone or ethanol. Use a medical syringe to spray acetone or ethanol to the suspicious place. When it is sprayed to the leakage point, the pointer of the ionization meter will swing obviously. In this way, it is necessary to be patient and wait until the indicator value of the ionization meter is stable - that is, the pumping capacity and leakage rate of the vacuum unit are balanced, and then spray. It is better to repeat several times to confirm the leakage point.
3. For larger leakage point, flame method can be used. Based on the principle that air flow can make the flame deviate, vacuum first. For example, use candle or lighter to gradually search around the suspicious point, and it will be found that the flame deviates to the leakage point, then the leakage point can be found.
4. The stainless steel water ring vacuum pump can be selected. It has strong corrosion resistance and will not be used properly!
How to use vacuum solenoid valve in vacuum system?
How to use vacuum solenoid valve in vacuum system Vacuum solenoid valve is a special valve for vacuum installed on mechanical vacuum pump. The valve and the pump are connected to the same power source. The opening and stopping of the pump directly control the opening and closing of the valve. How to use vacuum solenoid valve in vacuum system?
Vacuum solenoid valve is a special vacuum valve installed on a mechanical vacuum pump. The valve and the pump are connected to the same power source. The opening and stopping of the pump directly control the opening and closing of the valve. When the pump stops working or the power supply is suddenly interrupted, the valve can automatically close the vacuum system and fill the atmosphere into the pump cavity through the air inlet of the pump to prevent the pump oil from flowing back and polluting the vacuum system. The working medium for vacuum solenoid valve is air and non-corrosive gas.
How to use the vacuum solenoid valve in the vacuum system mainly includes the following points:
1. Before installing the vacuum solenoid valve, you should carefully read the instruction manual of the product, check whether the product fully meets the requirements for use, be familiar with the installation points, and make preparations.
2. During installation, the coil of the vacuum solenoid valve is upward and maintains a vertical position. The arrow or mark on the ZCA vacuum solenoid valve should be consistent with the flow direction of the pipeline.
3. Ordinary vacuum solenoid valves should not be used in flammable and explosive dangerous places.
4. When the vacuum solenoid valve fails, in order to isolate the ZCA vacuum solenoid valve in time and ensure the normal operation of the system, it is best to install a bypass device.
5. Do not install the vacuum solenoid valve in the low recess of the pipeline, so as to avoid steam condensate, impurities and other deposits in the valve and hinder the action.
6. In the case of insufficient pipeline rigidity, it is recommended to fix the front and rear pipes of the vacuum solenoid valve with a bracket to prevent vibration caused by the ZCA vacuum solenoid valve during operation.
7. Before taking over, fully flush the pipeline with a pressure of 0.3MPa to completely remove the metal powder sealing material residues and rust in the pipeline; the working medium of the vacuum solenoid valve should be clean and free of particles; impurities, it is recommended to install a filter in front of the valve. Install steam traps in the steam line; dirt and filters on the inner surface of the inlet solenoid valve must be cleaned regularly.
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