Device for detecting oil content of compressed gas

Abstract

The utility model provides an oil content detection device for compressed gas. The oil content detection device comprises a high-pressure gas cylinder, an oil-gas separator, an oil filter, a compressor and a gas recovery bottle, the inlet end of the gas recovery bottle communicates with the outlet end of the compressor, and the gas recovery bottle is used for recovering gas compressed by the compressor. According to the detection device, high-pressure gas can pass through lubricating oil to form oil-containing gas, then oil in the oil-containing gas is filtered and absorbed through the oil filter, and the oil content of the gas in unit weight can be obtained by calculating the difference of the front weight and the rear weight of the oil filter and the weight of the recycled gas. Therefore, the mass of the lubricating oil remained on the filter element of the oil filter after the compression medium with a certain flow passes through the oil-gas separation device is simulated, the amount of the lubricating oil carried by the unit compression medium, namely the oil content, is calculated, and corresponding lubricating oil products can be reasonably screened out according to different gases or refrigerants.

Description

Technical Field

[0001] The utility model relates to the field of inspection and testing equipment, in particular to a device for detecting the oil content of compressed gas. Background Art

[0002] The compression of gas in industrial production is inseparable from compressors. In process compression or refrigeration compression, screw compressors need to be fully mixed with the compressed medium in the compression chamber to achieve the purpose of cooling and lubrication. After the compressed gas is discharged, it needs to be separated from the oil and gas by an oil-gas separation device to meet the recycling requirements of oil and gas (including refrigerant in refrigeration compression). The effect of oil-gas separation is of great significance to subsequent recycling. Simply compressing the gas or achieving the purpose of gas transportation through compression, a small amount of oil in the gas has little effect, but in the refrigeration compressor, if the refrigerant gas contains a certain amount of oil, it is easy to cause the refrigeration system pipeline to be blocked, affecting the refrigeration effect or even failing to refrigerate. Therefore, it is very important to accurately detect the oil content in the gas and reasonably select the corresponding lubricant products for different gases or refrigerants. Utility Model Content

[0003] The main purpose of the utility model is to provide a device for detecting the oil content in compressed gas, so as to at least solve the problem in the prior art that there is a lack of suitable detection process equipment capable of accurately detecting whether the refrigeration compressed gas contains oil and how much the oil content is.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a compressed gas oil content detection device, comprising: a high-pressure gas cylinder, in which high-pressure gas is stored; an oil-gas separator, in which a predetermined amount of lubricating oil is stored; a gas inlet end of the oil-gas separator is connected to an outlet end of the high-pressure gas cylinder so as to introduce the high-pressure gas in the high-pressure gas cylinder into the oil-gas separator and form oil-containing gas through the lubricating oil; an oil filter, in which the inlet end of the oil filter is connected to the oil-gas outlet end of the oil-gas separator, and the oil filter is used to absorb and filter the oil in the oil-containing gas; a compressor, inlet end of the compressor is connected to outlet end of the oil filter, and the compressor is used to compress the gas filtered by the oil filter; a gas recovery bottle, inlet end of the gas recovery bottle is connected to outlet end of the compressor, and the gas recovery bottle is used to recover the gas compressed by the compressor; a weighing mechanism, and the weighing mechanism is used to weigh the oil filter.

[0005] Further, the compressed gas oil content detection device further includes: a first pressure gauge disposed at the outlet end of the high-pressure gas cylinder, and the first pressure gauge is used to monitor the pressure of the high-pressure gas cylinder; a pressure reducing valve, the inlet end of the pressure reducing valve is communicated with the outlet end of the high-pressure gas cylinder, and the pressure reducing valve is used to reduce the pressure of the gas in the high-pressure gas cylinder; a second pressure gauge disposed at the outlet end of the pressure reducing valve, and the second pressure gauge is used to monitor the gas pressure flowing to the oil-gas separator after the pressure reduction by the pressure reducing valve.

[0006] Further, the compressed gas oil content detection device further includes: a gas flow meter, the inlet end of the gas flow meter is communicated with the outlet end of the pressure reducing valve, and the outlet end of the gas flow meter is communicated with the gas inlet end of the oil-gas separator, and the gas flow meter is used to monitor the gas flow rate flowing to the oil-gas separator.

[0007] Further, the lubricating oil liquid level stored in the oil-gas separator is located at one-third of the height of the oil-gas separator; the gas inlet end of the oil-gas separator is located below the lubricating oil liquid level; the lower end of the oil-gas separator is provided with a discharging valve.

[0008] Further, the compressed gas oil content detection device further includes: a heater disposed on the oil-gas separator, and the heater is used to heat the lubricating oil stored in the oil-gas separator.

[0009] Further, the compressed gas oil content detection device further includes: a temperature gauge disposed on the oil-gas separator, and the temperature gauge is used to monitor the temperature of the lubricating oil in the oil-gas separator; a third pressure gauge disposed at the outlet end of the oil filter, and the third pressure gauge is used to monitor the pressure of the oil-containing gas after the lubricating oil passes through the oil-gas separator.

[0010] Further, the compressed gas oil content detection device further includes: a one-way control valve disposed on the pipeline between the outlet end of the oil filter and the inlet end of the compressor, and the one-way control valve is used to control the unidirectional flow of the gas filtered by the oil filter into the gas recovery bottle for recovery; a cooler, the inlet end of the cooler is communicated with the outlet end of the one-way control valve, and the cooler is used to cool the gas filtered by the oil filter; a dryer, the inlet end of the dryer is communicated with the outlet end of the cooler, and the outlet end of the dryer is communicated with the inlet end of the compressor; the dryer is used to dry the gas cooled by the cooler.

[0011] The oil content detection device for compressed gas of the technical solution of the present utility model includes a high-pressure gas cylinder, an oil-gas separator, an oil filter, a compressor, a gas recovery bottle, and a weighing mechanism. The high-pressure gas cylinder stores high-pressure gas; the oil-gas separator stores a predetermined amount of lubricating oil; the gas inlet end of the oil-gas separator is communicated with the outlet end of the high-pressure gas cylinder to introduce the high-pressure gas in the high-pressure gas cylinder into the oil-gas separator and form an oil-containing gas through the lubricating oil; the inlet end of the oil filter is communicated with the oil-gas outlet end of the oil-gas separator, and the oil filter is used to absorb and filter the oil in the oil-containing gas; the inlet end of the compressor is communicated with the outlet end of the oil filter, and the compressor is used to compress the gas filtered by the oil filter; the inlet end of the gas recovery bottle is communicated with the outlet end of the compressor, and the gas recovery bottle is used to recover the gas compressed by the compressor; the weighing mechanism is used to weigh the oil filter. Through this detection device, high-pressure gas can be formed into an oil-containing gas through lubricating oil, and then the oil in the oil-containing gas can be filtered and absorbed by the oil filter. The oil content per unit weight of the gas can be obtained by weighing the oil filter before and after the experiment by the weighing mechanism and the weight of the recovered gas. Thus, it can simulate the mass of the lubricating oil remaining on the oil filter element after a certain flow rate of the compressed medium passes through the oil-gas separation device, calculate the amount of lubricating oil carried out per unit of the compressed medium, that is, the oil content rate, and further can reasonably select the corresponding lubricating oil product for different gases or refrigerants. It solves the problems that under the existing technical conditions, the oil content rate of the gas cannot be accurately measured, resulting in no suitable screening means when selecting compressor oil and compressed medium, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0013] Figure 1 FIG. is a schematic structural diagram of an oil content detection device for compressed gas according to an embodiment of the present utility model.

[0014] Among them, the above-mentioned drawings include the following reference numerals:

[0015] 10. High-pressure gas cylinder; 20. Oil-gas separator; 30. Oil filter; 40. Compressor; 50. Gas recovery bottle; 60. First pressure gauge; 70. Pressure reducing valve; 80. Gas flowmeter; 90. Second pressure gauge; 100. Discharge valve; 110. Heater; 120. Temperature measuring instrument; 130. Third pressure gauge; 140. Check valve; 150. Cooler; 160. Dryer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will describe the present utility model in detail with reference to the drawings and in conjunction with the embodiments.

[0017] The oil content detection device for compressed gas according to the embodiment of the present utility model, as Figure 1 shown, includes a high-pressure gas cylinder 10, an oil-gas separator 20, an oil filter 30, a compressor 40, and a gas recovery bottle 50. The high-pressure gas cylinder 10 stores high-pressure gas; a predetermined amount of lubricating oil is stored in the oil-gas separator 20; the gas inlet end of the oil-gas separator 20 is communicated with the outlet end of the high-pressure gas cylinder 10 to introduce the high-pressure gas in the high-pressure gas cylinder 10 into the oil-gas separator 20 and form an oil-containing gas through the lubricating oil; the inlet end of the oil filter 30 is communicated with the oil-gas outlet end of the oil-gas separator 20, and the oil filter 30 is used to absorb and filter the oil in the oil-containing gas; the inlet end of the compressor 40 is communicated with the outlet end of the oil filter 30, and the compressor 40 is used to compress the gas filtered by the oil filter 30; the inlet end of the gas recovery bottle 50 is communicated with the outlet end of the compressor 40, and the gas recovery bottle 50 is used to recover the gas compressed by the compressor 40; a weighing mechanism is used to weigh the oil filter. Through this detection device, high-pressure gas can be formed into an oil-containing gas through lubricating oil, and then the oil in the oil-containing gas is filtered and absorbed by the oil filter 30. The oil content per unit weight of the gas can be obtained by weighing the oil filter 30 before and after the experiment by the weighing mechanism and the weight of the recovered gas. Thus, the mass of the lubricating oil remaining on the filter element of the oil filter 30 after a certain flow rate of the compressed medium passes through the oil-gas separation device is simulated, and the amount of lubricating oil carried out by the unit compressed medium, that is, the oil content rate, can be calculated. Furthermore, for different gases or refrigerants, the corresponding lubricating oil products can be reasonably selected. This solves the problems that under the existing technical conditions, the oil content rate of the gas cannot be accurately measured, resulting in no suitable screening means when selecting the oil of the compressor 40 and the compressed medium.

[0018] In specific implementation, the compressed media applicable to the detection device of this embodiment include the oil content in gases such as air, ammonia, hydrocarbon gases, etc. and refrigerant gases such as R22, R34, etc. The high-pressure gas cylinder 10 can be a commonly used pressure-resistant steel cylinder with a minimum pressure resistance of ten megapascals. The compressed gas oil content detection device further includes a first pressure gauge 60, a pressure reducing valve 70, a gas flowmeter 80, and a second pressure gauge 90. The first pressure gauge 60 is arranged at the outlet end of the high-pressure gas cylinder 10, and the first pressure gauge 60 is used to monitor the original gas pressure of the high-pressure gas cylinder 10; the inlet end of the pressure reducing valve 70 is communicated with the outlet end of the high-pressure gas cylinder 10, and the pressure reducing valve 70 is used to reduce the pressure of the gas in the high-pressure gas cylinder 10; the inlet end of the gas flowmeter 80 is communicated with the outlet end of the pressure reducing valve 70, the outlet end of the gas flowmeter 80 is communicated with the gas inlet end of the oil-gas separator 20, the gas flowmeter 80 is acid and alkali resistant, and it is provided with a regulating valve for adjusting the flow rate; the gas flowmeter 80 is used to monitor the gas flow rate flowing to the oil-gas separator 20; the second pressure gauge 90 is arranged at the outlet end of the pressure reducing valve 70, and the second pressure gauge 90 is used to monitor the gas pressure flowing to the oil-gas separator 20 after the pressure reduction by the pressure reducing valve 70. Through the pressure reducing valve 70, the gas flowmeter 80, and the second pressure gauge 90, it is ensured that the gas in the high-pressure gas cylinder 10 can be transported to the oil-gas separator 20 at a predetermined pressure and flow rate after pressure reduction, ensuring that no obvious bubbles are generated in the lubricating oil in the oil-gas separator 20 during the experiment.

[0019] Further, the oil-gas separator 20 is of a cylindrical barrel structure and is installed vertically. Inside the oil-gas separator 20, there is a coarse metal filter screen and a baffle. The baffle is used to change the rising path and speed of the oil-containing gas. The upper and lower parts of the side wall of the oil-gas separator 20 are respectively provided with a pressure-resistant glass window, which is used to observe the height of the lubricating oil level in the oil-gas separator 20 and whether a large number of bubbles are generated after the high-pressure gas enters during the experiment; in fact, the bubbles are formed by a certain amount of gas wrapped by an oil film. If there are too many bubbles, under the supporting action of the gas, they will rise to the oil filter 30 and adsorb on it. After the bubbles burst, the oil film will adsorb on the surface of the oil filter 30, resulting in inaccurate measurement results, which is an abnormal phenomenon; at the same time, it will also prevent the subsequent gas from passing through and cause the system to be blocked by pressure. The lubricating oil level stored in the oil-gas separator 20 is at one-third of the height of the oil-gas separator 20; if the lubricating oil level is too high, the rising and separating space of the oil and gas is too small to achieve the oil-gas separation effect, and a large amount of oil droplets will be carried by the gas to the oil filter, causing the oil filter 30 to be blocked; if the liquid level is too low, the carried oil volume will be too small to be detected on the oil filter 30. The gas inlet end of the oil-gas separator 20 is arranged on the side wall of the oil-gas separator 20 and is located below the lubricating oil level. The oil-gas outlet end of the oil-gas separator 20 is located at the top of the oil-gas separator 20; the oil filter 30 is located above the oil-gas separator 20 and is connected to the oil-gas separator 20 through a flange or a screw thread. There is a control valve between the oil-gas outlet end of the oil-gas separator 20 and the oil filter 30, which can control the speed of the oil-containing gas entering the oil filter 30. The oil filter 30 includes a metal shell, and the inside of the metal shell is filled with filter paper or filter cloth, which can absorb and filter the oil in the oil-containing gas. The lower end of the oil-gas separator 20 is provided with a discharge valve 100, and through the discharge valve 100, the lubricating oil after the experiment can be discharged.

[0020] Furthermore, the compressed gas oil content detection device further includes a heater 110. The heater 110 is disposed on the oil-gas separator 20 and is used to heat the lubricating oil stored in the oil-gas separator 20. Specifically, the heater 110 includes an electric heating tape or a heating blanket, and the heater 110 is externally provided with a temperature monitoring and control system, which can accurately control the internal temperature of the oil-gas separator. A temperature measuring instrument 120 is disposed on the oil-gas separator 20, and the temperature measuring instrument 120 is used to monitor the actual temperature of the lubricating oil in the oil-gas separator 20 so as to ensure that the lubricating oil can be heated to a preset temperature. Different temperatures will cause changes in the viscosity of the oil product, and the separation effect of oil products with different viscosities from gas is different, that is, the amount of oil carried by the gas is different. By heating and maintaining the lubricating oil at a constant temperature, lubricating oils with different viscosities can be prepared according to different experimental requirements. A third pressure gauge 130 is disposed at the outlet end of the oil filter, and the third pressure gauge 130 is used to monitor the pressure of the oil-containing gas after the lubricating oil passes through the oil-gas separator 20. The pressure difference before and after the oil-gas separator 20 shall not be greater than 0.02 MPa, that is, the pressure difference between the second pressure gauge 90 and the third pressure gauge 130 cannot exceed the set value, otherwise it will cause system pressure buildup and affect the normal progress of the experiment. System pressure buildup is mainly caused by blockage of the oil filter 30, resulting in poor gas flow. If the pressure difference is very large, it may pierce the filter paper or filter cloth in the oil filter 30, causing filtration failure.

[0021] Furthermore, the compressed gas oil content detection device further includes a one-way control valve 140. The one-way control valve 140 is disposed on the pipeline between the outlet end of the oil filter 30 and the inlet end of the compressor 40. The one-way control valve 140 is used to control the unidirectional flow of the gas filtered by the oil filter 30 into the gas recovery bottle 50 for recovery. The inlet end of the cooler 150 is communicated with the outlet end of the one-way control valve 140. The cooler 150 is used to cool down the high-temperature gas filtered by the oil filter 30. The cooler 150 can be selected from water cooling, oil cooling, air cooling and other methods. The inlet end of the dryer 160 is communicated with the outlet end of the cooler 150, and the outlet end of the dryer 160 is communicated with the inlet end of the compressor 40. The dryer 160 is used to dry the gas cooled by the cooler 150. The dryer 160 can withstand the pressure of the compressor 40, and the inside of the dryer 160 is filled with desiccants such as activated carbon and silica gel.

[0022] The specific operation steps of the compressed gas oil content detection device according to the embodiment of the present invention are as follows:

[0023] First, before the test, clean the oil-gas separator 20 with petroleum ether or other organic solvents and blow it dry with compressed air, and add a certain amount of lubricating oil to about one-third of the height of the oil-gas separator 20. The liquid level of the lubricating oil is at the midline of the lower glass window of the oil-gas separator 20.

[0024] Second, accurately weigh the brand-new dried oil filter 30 with a ten-thousandth balance and then install it at the oil and gas outlet end at the upper end of the oil and gas separator 20.

[0025] Third, turn on the heating system of the oil and gas separator 20, heat it to the specified temperature, and the temperature measuring instrument 120 monitors the oil temperature in real time. When the temperature reaches the set temperature, keep it at a constant temperature for standby.

[0026] Fourth, open the main valve of the high-pressure gas cylinder 10, adjust the pressure reducing valve 70 and the gas flowmeter 80, so that the gas is transported to the oil and gas separator 20 at an appropriate flow rate (no obvious foam can be seen through the glass window of the oil and gas separator 20). Ensure that the pressure difference before and after the oil and gas separator 20 shall not be greater than 0.02 MPa, otherwise it will cause system pressure build-up.

[0027] Fifth, turn on the compressor 40, compress the cooled and dried gas discharged from the oil and gas separator 20 into the gas recovery bottle 50 for recovery.

[0028] Sixth, after the test is completed, close the control valves before and after the high-pressure gas cylinder 10 and the oil and gas separator 20, remove the oil filter 30, weigh it with a ten-thousandth balance and record it.

[0029] Seventh, according to the weight increase of the oil filter 30 and the weight of the recovered gas, the lubricating oil amount carried in the gas per unit volume can be calculated, that is, the gas oil content; the weight of the recovered gas can be calculated through the gas flow rate and time, or obtained through the change in the weight of the gas cylinder.

[0030] Eighth, the gas can be reused after being recovered into the gas recovery bottle 50. If the weight increase of the oil filter 30 cannot be accurately measured, the test time can be extended until enough lubricating oil is adsorbed on the oil filter 30 and can be measured;

[0031] Ninth, by adjusting the temperature of the oil and gas separator 20, the test can be repeated to measure the oil content under different temperature conditions, so as to reasonably screen out the corresponding lubricating oil products for different gases or refrigerants.

[0032] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An oil content detection device for compressed gas, characterized in that, Comprising: A high-pressure gas cylinder (10) storing high-pressure gas therein; An oil-gas separator (20) storing a predetermined amount of lubricating oil therein; the gas inlet end of the oil-gas separator (20) is in communication with the outlet end of the high-pressure gas cylinder (10) to introduce the high-pressure gas in the high-pressure gas cylinder (10) into the oil-gas separator (20) and pass through the lubricating oil to form oil-containing gas; An oil filter (30) whose inlet end is detachably in communication with the oil-gas outlet end of the oil-gas separator (20), and the oil filter (30) is used to absorb and filter the oil content in the oil-containing gas; A compressor (40) whose inlet end is in communication with the outlet end of the oil filter (30), and the compressor (40) is used to compress the gas filtered by the oil filter (30); A gas recovery bottle (50) whose inlet end is in communication with the outlet end of the compressor (40), and the gas recovery bottle (50) is used to recover the gas compressed by the compressor (40); A weighing mechanism for weighing the oil filter (30).

2. The compressed gas oil content detection device according to claim 1, characterized in that, The compressed gas oil content detection device further comprises: A first pressure gauge (60) provided at the outlet end of the high-pressure gas cylinder (10), and the first pressure gauge (60) is used to monitor the pressure of the high-pressure gas cylinder (10); A pressure reducing valve (70) whose inlet end is in communication with the outlet end of the high-pressure gas cylinder (10), and the pressure reducing valve (70) is used to reduce the pressure of the gas in the high-pressure gas cylinder (10); A second pressure gauge (90) provided at the outlet end of the pressure reducing valve (70), and the second pressure gauge (90) is used to monitor the gas pressure flowing to the oil-gas separator (20) after the pressure reduction by the pressure reducing valve (70).

3. The compressed gas oil content detection device according to claim 2, characterized in that, The compressed gas oil content detection device further comprises: A gas flowmeter (80) whose inlet end is in communication with the outlet end of the pressure reducing valve (70), and the outlet end of the gas flowmeter (80) is in communication with the gas inlet end of the oil-gas separator (20), and the gas flowmeter (80) is used to monitor the gas flow rate flowing to the oil-gas separator (20).

4. The compressed gas oil content detection device according to claim 1, characterized in that, The lubricating oil liquid level stored in the oil-gas separator (20) is at one-third of the height of the oil-gas separator (20); the gas inlet end of the oil-gas separator (20) is located below the lubricating oil liquid level; the lower end of the oil-gas separator (20) is provided with a discharge valve (100).

5. The compressed gas oil content detection device according to claim 1, characterized in that, The compressed gas oil content detection device further comprises: A heater (110) provided on the oil-gas separator (20), and the heater (110) is used to heat the lubricating oil stored in the oil-gas separator (20).

6. The compressed gas oil content detection device according to claim 5, characterized in that, The compressed gas oil content detection device further comprises: A temperature measuring instrument (120) provided on the oil-gas separator (20), and the temperature measuring instrument (120) is used to monitor the temperature of the lubricating oil in the oil-gas separator (20). A third pressure gauge (130) is provided at the outlet end of the oil filter (30), and the third pressure gauge (130) is used to monitor the pressure of the oil-containing gas after the lubricating oil passes through the oil-gas separator (20).

7. The compressed gas oil content detection device according to claim 1, wherein The compressed gas oil content detection device further includes: A one-way control valve (140) is provided on the pipeline between the outlet end of the oil filter (30) and the inlet end of the compressor (40), and the one-way control valve (140) is used to control the unidirectional flow of the gas filtered by the oil filter (30) into the gas recovery bottle (50) for recovery; A cooler (150), the inlet end of the cooler (150) is communicated with the outlet end of the one-way control valve (140), and the cooler (150) is used to cool the gas filtered by the oil filter (30); A dryer (160), the inlet end of the dryer (160) is communicated with the outlet end of the cooler (150), and the outlet end of the dryer (160) is communicated with the inlet end of the compressor (40); the dryer (160) is used to dry the gas cooled by the cooler (150).

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