Oil-water separator capable of actively pressurizing by using compressed air

Abstract

The invention relates to an oil-water separator capable of actively pressurizing by using compressed air, and relates to the technical field of oil-water separation devices. The device comprises a control unit, a liquid level sensor, a main filter, an oil discharge pipe, an oil collection barrel, a piston valve, an electromagnetic valve and the like. The liquid level sensor is used for monitoring the liquid level of condensate, and the control unit controls opening and closing of the valve and on-off of compressed air according to signals of the liquid level sensor. According to the oil-water separator, firstly, a floating oil layer above condensate is removed by utilizing gravity separation and a pressure difference principle, and then compressed air is actively introduced to push the condensate in a main cavity of a shell into a main filter, so that an oil component in the condensate is removed. The filter has the advantages of being easy to operate, durable and small in energy consumption, and the common problem that condensate overflows due to the fact that resistance of a filter in the industry is increased at present is solved.

Description

Technical Field

[0001] The present application relates to the field of oil-water separation, and in particular to an oil-water separator that uses compressed air for active pressurization. Background Art

[0002] Oil-water separators are often used in conjunction with air compressors to produce compressed air by sucking in and compressing ambient air. In this process, since the compressed air is not dried, the water contained in the ambient air will accumulate in the form of condensate. Assuming the volume flow rate of the compressor sucking air is 60m 3 / h, it can usually intermittently produce a condensate flow of about 1.23L / h and about 240 mg / h of oil, which is equivalent to about 195 mg of oil per liter of condensate. In my country, the oil content requirement for direct liquid discharge is 10 mg / L, and in some areas it is 5 mg / L. Therefore, the condensate generated by the air compressor is a waste liquid and needs to be purified by an oil-water separator before it can be discharged.

[0003] The oil-water separators in the related art are mainly divided into two categories: The first type uses two stages for oil-water separation: In the first stage, the condensate is usually slowly discharged into the pre-separator through a pressure relief element. According to the principle of gravity separation, the density is greater than 1kg / dm 3 Heavy pollutants are deposited at the bottom of the condensate with a density of less than 1kg / dm 3 The oil content of the condensate floats on the upper layer. The floating oil layer flows to the collection container. In the second stage, the condensate flows into the adsorption filter, which usually uses oleophilic materials and activated carbon with a very large internal surface area to further adsorb the oil content in the condensate.

[0004] The other type uses the method of passing the condensate and the floating oil layer through the adsorption filter: the filter element floats on the surface of the condensate and absorbs the oil component in it. Using the principle of pressure difference, the treated condensate flows out of the equipment at the clean water outlet.

[0005] With respect to the above-mentioned related technologies, the inventor believes that there are the following defects: no matter which method is used to separate the oil and liquid, the filter element is ultimately required to adsorb the oil and liquid, and as the oil and liquid separator is operated for a longer time, the condensate will become more viscous or form a viscous layer, which will increase the flow resistance of the filter element, so that the condensate will overflow or flow back. In order to prevent the above situation from happening, even if the adsorption capacity of the filter element has not been exhausted, the filter element must be replaced as soon as possible, which will lead to a waste of the adsorption capacity of the filter element, so it needs to be improved. Summary of the invention

[0006] In order to reduce the waste caused by premature replacement of filter elements whose adsorption capacity has not been exhausted, the present application provides an oil-water separator that uses compressed air for active pressurization.

[0007] The present application provides an oil-water separator that uses compressed air for active pressurization, which adopts the following technical solution: The oil-water separator of the present invention is suitable for removing oil-containing components from condensate, wherein the condensate comes from an air compressor.

[0008] The oil-water separator consists of a main filter designed to separate oily components from condensate. The condensate to be purified passes through the main filter and is discharged from the oil-water separator. Based on the pressure difference principle, the amount of treated condensate leaving the device is the same as the amount of new condensate flowing into the device.

[0009] Therefore, the device can be operated without additional energy supply in principle and can continuously and stably separate the oil component from the condensate. According to the present invention, the oil-water separator has a control unit, which can control the compressed air to enter the oil-water separator. The compressed air pushes the condensate to overcome the flow resistance and enter the main filter.

[0010] During normal operation, the device can separate oil and water according to the principle of gravity separation. If the flow resistance of the filter element increases, the control unit controls the compressed air to enter the oil-water separator, pushing the condensate to overcome the flow resistance and enter the main filter, thereby avoiding condensate overflow. Therefore, the device has two operating modes that can be used alternately, which can ensure that the condensate passes through the filter even if the flow resistance increases. This makes the service life of the filter element longer, thereby extending the interval between shutdowns for maintenance. At the same time, it can also ensure that the device can operate normally during the maintenance interval.

[0011] In order to detect whether the flow resistance of the filter element increases, a liquid level sensor for detecting the condensate level can be provided in the oil-water separator, and the sensor is connected to the control unit. If the flow resistance of the filter element increases, the condensate level in the device will also rise. In one embodiment of the present invention, if the liquid level sensor detects a predetermined maximum working liquid level A, the control unit controls the compressed air to enter the oil-water separator. The liquid level A is the maximum working liquid level of the condensate, and theoretically it should not exceed this liquid level.

[0012] If the liquid level sensor detects that the real-time liquid level of the condensate reaches the predetermined minimum working liquid level B, the control unit stops filling the oil-water separator with compressed air. After the compressed air stops entering the oil-water separator, the condensate continues to flow in, raising the condensate level until it reaches the maximum working liquid level A again. The two operating modes are alternated. In this way, the operating liquid level of the equipment is always between A and B.

[0013] Optionally, a further level C can be defined below the minimum operating level B. This level C constitutes a minimum alarm level, below which the condensate level should not fall. If the condensate level falls below this level C, an alarm can be output and / or the device can be automatically shut down.

[0014] The control unit can perform various evaluation and control functions and can also provide user interaction functions. Therefore, the control unit also includes, for example, a display and an input device for entering commands. The user can issue control commands via the interactive function to control the flow of compressed air into the oil-water separator. For example, during equipment maintenance, the filter element needs to be replaced. This function can be used before replacing the filter element to discharge most of the condensate in the oil-water separator, avoiding a large amount of condensate flowing out when the filter is disassembled.

[0015] Preferably, during the period when the compressed air is passed into the oil-water separator, the condensate is stopped from entering the oil-water separator. In this way, the condensate inlet is closed to prevent the compressed air from escaping from the inlet. Such a structure is conducive to building up pressure in the chamber to overcome the flow resistance of the filter element.

[0016] The compressed air can enter the housing chamber in different ways and with different valves. In one embodiment of the invention, the compressed air and the condensate enter the housing chamber through a common piston valve, which can be pushed by the compressed air. The piston valve has a compressed air chamber and a condensate chamber, which are separated from each other by a piston. The piston valve also has a condensate inlet, through which the condensate enters the condensate chamber, and a compressed air inlet, through which the compressed air enters the compressed air chamber. At the same time, the condensate outlet of the piston valve is used to discharge the condensate from the condensate chamber into the chamber in the housing, and there is also a compressed air outlet, which is used to discharge the compressed air from the compressed air chamber into the chamber in the housing. The condensate inlet of the valve can be closed by the piston filling the compressed air chamber. Therefore, the compressed air can enter the housing chamber by flowing through the compressed air chamber of the piston valve. At the same time, the compressed air closes the condensate inlet of the piston valve by moving the piston, thereby preventing the condensate from flowing further into the chamber in the housing. At the same time, the compressed air cannot escape from the closed condensate inlet.

[0017] In order to enable the compressed air to build up sufficient pressure in the compressed air chamber to push the piston, the compressed air outlet of the piston valve preferably has a smaller opening cross section than the compressed air inlet. Therefore, the compressed air can quickly increase the pressure in the compressed air chamber, thereby pushing the piston and preventing condensate from entering the piston valve.

[0018] In addition to the main filter for separating the oil components, the oil-water separator can also have further functional elements. For example, it can be provided that the housing of the device has a condensate inlet, through which the condensate can first enter the pressure relief chamber in the housing and then enter the main chamber of the housing via the pressure relief chamber. In order to prevent the compressed air from escaping from the pressure relief chamber, it can be sealed with a closable valve, which can also be activated by the control unit. If the above-mentioned piston valve is used, the pressure relief chamber is connected to the condensate chamber of the piston valve via the condensate inlet.

[0019] In order to remove the floating oil layer from the condensate before the main filter, in one embodiment of the present invention, the floating oil on the upper layer of the condensate can be discharged from the main chamber through an oil drain pipe. The oil drain pipe can be connected to a collection container. During the period when the control unit controls the compressed air to enter the main chamber of the housing, the inlet of the oil drain pipe can also be closed by controlling a valve such as a solenoid valve, thereby preventing the compressed air from escaping from the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the embodiment of the present application in a non-pressurized state; Figure 2 This is a schematic diagram of the structure of the embodiment of the present application under a pressurized state; Figure 3 This is a schematic diagram of the structure inside the piston valve module in the non-pressurized state of the embodiment of the present application; Figure 4 This is a schematic diagram of the structure inside the piston valve module in the pressurized state of an embodiment of the present application.

[0021] In the figure: 11. Condensate to be treated; 11'. Condensate after gravity separation of floating oil; 11", clean water after passing through the main filter; 12. Pressure relief port; 13. Floating oil layer; 14. Compressed air; 20. Shell; 21. Pressure relief chamber; 22. Condensate inlet; 23. Shell connection port; 24. Main chamber; 25. Pressure relief filter element; 30. Main filter; 31. Adsorption filter material; 32. Main filter inlet; 33. Main filter outlet; 40. Standpipe; 41. Exhaust port; 42. Clean water outlet; 50. Piston valve module; 51. Valve body; 52. Compressed air chamber; 53. Condensate chamber; 54. Piston; 55. Condensate inlet; 56. Condensate outlet; 57. Compressed air outlet; 58. Compressed air inlet; 60. Control unit; 62. Valve; 63. Compressed air interface; 64. Liquid level sensor; 70. Oil collecting barrel; 71. Oil drain pipe; 72. Valve; A. Maximum working liquid level; B. Minimum working liquid level; C. Minimum alarm liquid level. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-4 This application is described in further detail.

[0023] The embodiment of the present application discloses an oil-water separator that uses compressed air for active pressurization.

[0024] Reference Figure 1 , Figure 1 The various components of the oil-water separator of the present invention are schematically shown (and in the illustrated state, the condensate is in a normal circulation state). The oil-water separator comprises at least one main filter 30, which has a housing in which a corresponding adsorption filter material 31 is inserted. It is used to treat the condensate 11 to be treated from the air compressor, and separate the oil component from the condensate through the adsorption filter material 31. Preferably, the adsorption filter material 31 contains a material that can separate finely dispersed or even emulsified oil, and can be selected from a surface compacted oleophilic melt-spinning polymer with distribution orientation, activated carbon with suitable consistency and size to absorb the finest oil droplets, and an oleophilic polymer foaming material.

[0025] The oil-water separator also includes a control unit 60, by which various functions of the device can be controlled. Specifically, it includes the evaluation of various sensor signals, the opening and closing of valves and the detection of cycles. The control unit 60 also preferably has an input device for manually inputting control commands, for example, maintenance work can be performed on the device by manually inputting control commands. The control unit 60 may also include a display device for displaying device status, warnings and service notifications.

[0026] The oil-water separator works based on the principle of pressure difference, and has a housing 20. The housing 20 is usually connected above the main filter 30, and is connected to the main filter 30 through the housing connection port 23 at the bottom of the housing. The connection method can adopt the detachable connection method in the existing public technology to facilitate the subsequent replacement / maintenance of the main filter 30. The main filter 30 can be one or more freely combined cartridge filters. The main filter 30 is connected to the housing connection port 23 at the bottom of the housing 20 through the main filter inlet 32 ​​at the top of the main filter 30, which can be achieved by threaded connection.

[0027] The condensate 11 comes from the air compressor and enters the interior of the housing 20 through the condensate inlet 22 opened on the housing 20. Due to the effect of gravity, the condensate 11 finally flows into the main filter 30 located below the housing 20. The main filter 30 is connected to the standpipe 40 through the main filter outlet 33 opened at the bottom of the main filter 30, and the clean water 11" after passing through the main filter is finally discharged through the standpipe 40. The main filter outlet 33 can be connected to the standpipe 40 through threads, so that the main filter 30 can be replaced as an independent whole. The amount of clean water 11" flowing out of the device from the clean water outlet is the same as the amount of new condensate 11 flowing into the housing 20.

[0028] At the height of the condensate level in the housing 20 thus generated, an oil drain pipe 71 is provided, which is connected to the oil collection barrel 70 via a valve 72. The valve 72 is a solenoid valve that can be controlled by the control unit 60. The floating oil layer 13 on the upper layer of the condensate 11' in the housing 20 can be discharged and collected via the oil drain pipe 71. The density of these floating oil components is less than 1 kg / dm 3 That is, before the condensate 11 enters the main filter 30 , the floating oil layer 13 is pre-separated, so that the pre-purified condensate 11 ′ enters the main filter 30 . In other optional embodiments, the separation of the floating oil layer 13 can also be integrated into the cartridge filter of the main filter 30 .

[0029] For separation density > 1 kg / dm 3 The intermediate collector of the condensate of the heavy sediment-like components (not shown in the figure) can be arranged upstream or downstream of the condensate inlet 22. The device makes these components settle at the bottom of the device according to the principle of gravity separation, and do not enter the main filter 30. Since this part is the technical content available in the public prior art and is not related to the core invention of the present application, it is not repeated in this embodiment.

[0030] Reference Figure 1 The housing 20 has a pressure relief chamber 21 and a main chamber 24 inside. The condensate 11 passes through the pressure relief chamber 21 and the main chamber 24 in sequence and then enters the main filter 30. The main chamber 24 and the pressure relief chamber 21 together constitute the internal chamber of the housing. The condensate 11 first enters the pressure relief chamber 21, so that the compressed air mixed in the condensate can be discharged at the pressure relief port 12 at the top of the pressure relief chamber 21 to release the pressure. The pressure relief port 12 is equipped with a pressure relief filter element 25 to absorb the oil component brought out by the compressed air, and a valve (not shown) that can be controlled to open and close can also be provided.

[0031] After the condensate 11 is depressurized from the pressure relief chamber 21, it enters the main chamber 24 and is separated by gravity in a natural state. The floating oil layer 13 accumulates at the oil drain pipe 71 and is discharged through the oil drain pipe 71. The condensate 11' after gravity separation below the floating oil layer 13 flows into the main filter 30. The clean water 11" after passing through the main filter 30 is discharged into the sewer through the riser 40. Under normal operating conditions, a certain height of condensate level will be formed in the main chamber 24.

[0032] However, as the upper filter element of the main filter 30 is saturated with adsorption and a viscous layer of liquid is formed, the flow resistance of the main filter 30 may increase. If this happens, the condensate level in the main chamber 24 will rise, which may cause the condensate to overflow. In addition, due to the rise in the condensate level, the condensate 11' after only the floating oil is separated by gravity will also flow into the oil collection barrel 70.

[0033] Therefore, the present invention proposes that the compressed air 14 can be used to overcome the aforementioned flow resistance, and the condensate 11 ′ can be “passively” pushed into the main filter 30 by air pressure.

[0034] like Figure 2 As shown. The oil-water separator is connected to a compressed air interface 63 with a valve 62, and the compressed air 14 enters the main chamber 24 from the compressed air interface 63 to achieve the above-mentioned process of overcoming fluid resistance. At least one liquid level sensor 64 is arranged inside the housing 20 to detect the condensate level in the main chamber 24. The liquid level sensor 64 is connected to the control unit 60, and the control unit 60 evaluates the signal of the liquid level sensor 64, and when the condensate level rises to a certain level, opens the valve 62 to allow the compressed air to enter the main chamber 24.

[0035] Preferably, the compressed air 14 enters the main chamber 24 at a suitable pressure, so that a pressure difference is generated between the main chamber 24 and the main filter outlet 33, and the condensate 11' is pushed into the main filter 30 by the pressure difference. If high-pressure compressed air is selected, it can be adjusted by the throttling effect of the valve 62 until the pressure is in a suitable range to achieve smooth pushing of the condensate.

[0036] The premise of using compressed air for pressurization is that the main chamber 24 and the connection between the main chamber 24 and the main filter 30 are tight, and the compressed air cannot escape from the connection of the connector. In addition, the valve 72 above the oil collection barrel 70 can be closed by the control unit 60, and the entry of new condensate 11 is stopped during the introduction of compressed air to prevent the compressed air from escaping.

[0037] Reference Figure 1 A piston valve module 50 is disposed in the main chamber 24 , and the piston valve module 50 includes two chambers: a compressed air chamber 52 and a condensate chamber 53 . The two chambers are separated from each other by a piston 54 .

[0038] Under normal circumstances, the condensate 11 flows out of the pressure release chamber 21 and flows into the condensate chamber 53 inside the piston valve module 50 through the condensate inlet 55, and then flows into the main chamber 24 through the condensate outlet 56. The clean water 11" after passing through the main filter flows out of the equipment at the clean water outlet 42 and flows into the sewer, and its amount is the same as the amount of condensate 11 flowing into the chamber 24 from the condensate outlet 56. In this process, a certain height of condensate level is formed in the main chamber 24.

[0039] The liquid level sensor 64 is preferably configured to detect only the liquid level of the condensate 11 ′, and the detection result does not include the thickness of the floating oil layer 13 above the condensate.

[0040] If the flow resistance of the main filter 30 increases, the condensate level rises. For example, the liquid level A is set as the maximum liquid level of the condensate. If the liquid level sensor 64 detects that the condensate level is higher than the maximum working liquid level A, the control unit 60 opens the valve 62 to allow the compressed air 14 to enter the compressed air chamber 52 inside the piston valve module 50, and then enter the main chamber 24 of the housing 20 through the compressed air outlet 57.

[0041] The compressed air outlet 57 has a smaller cross section than the compressed air inlet 58, so the compressed air 14 can quickly build up pressure in the compressed air chamber 52. Under the push of the compressed air, the piston 54 in the piston valve module 50 will move to the left in the direction toward the condensate inlet 55 and close the condensate inlet 55, so that the condensate 11 cannot continue to enter the main chamber 24. The control unit 60 also stops the condensate 11 from entering the pressure release chamber 21 at the same time. This can be combined with an intermediate condensate collector upstream of the oil-water separator, or in other embodiments, the condensate can flow to another oil-water separator connected in parallel.

[0042] After the piston 54 closes the condensate inlet 55, no air can escape from the main chamber 24 into the pressure relief chamber 21. During this process, the control unit 60 will also close the valve 72 to further prevent the compressed air from escaping. As the compressed air continues to enter the main chamber 24 until the pressure in the chamber rises to a level sufficient to overcome the flow resistance of the filter element, the condensate 11' can be pushed into the main filter 30, and the clean water after passing through the main filter is also pushed through the riser 40 and discharged into the sewer. This ensures that the equipment continues to operate normally, and the condensate will not overflow due to the increase in the flow resistance of the filter. During this process, the compressed air 14 is first used to push the piston 54 to close the condensate inlet 55, and then used to build pressure in the main chamber 24, as shown in Figure 2. The condensate level has reached the highest working level A, and the piston 54 closes the condensate inlet 55.

[0043] Figure 3 and Figure 4 Schematic diagram of the operation mode of the piston valve module 50. The piston valve module 50 has a shell-shaped valve body 51, and the piston 54 separates the two chambers of the valve body 51, the compressed air chamber 52 and the condensate chamber 53. Figure 3 ), the piston 54 is in a position where the condensate inlet 55 is open, and condensate can flow in from the condensate inlet 55, pass through the condensate chamber 53, and then flow out from the condensate outlet 56. If compressed air 14 is passed into the compressed air inlet 58, the pressure in the compressed air chamber 52 increases, and the piston 54 is pressed against the condensate inlet 55, thereby sealing the latter. Compressed air flows out from the compressed air outlet 57, thereby building up pressure in the main chamber of the housing.

[0044] Under predetermined conditions, the control unit 60 can control the compressed air 14 to stop entering the oil-water separator. For example, if the condensate level reaches the minimum working level B, the compressed air can be stopped. If the compressed air 14 is stopped, the piston 54 returns to its initial position ( Figure 1 ) and open the condensate inlet 55, and new condensate 11 can flow into the main chamber 24. If the condensate level rises to the highest working level A again, compressed air can be introduced again, so that normal operation and compressed air introduction are continuously alternated. Therefore, during normal operation, the condensate level moves between point A and point B.

[0045] If the condensate level in the main chamber 24 does not reach the minimum operating level B during continuous operation, but remains above the minimum operating level B even during pressurization, an error message can be issued on the control unit 60. This indicates that the main filter 30 is clogged or the piston valve module 50 is defective.

[0046] The compressed air 14 may also be turned off after a predetermined period of time. For example, based on operating experience, the time required for the liquid level in the main chamber 24 to drop to the corresponding B liquid level can be summarized, and the A liquid level can be defined and timer control can be implemented.

[0047] In addition, a minimum alarm level C is provided, at which the condensate level must not drop. It is located below the B level. If the condensate level is lower than the minimum alarm level C, this indicates that the solenoid valve 62 is faulty and compressed air continues to flow in uncontrollably. In this case, an error notification may be output on the control unit 60, otherwise the container may be completely emptied. Therefore, point C may be selected as the alarm point.

[0048] It can also be provided that the control unit 60 outputs a service notification, for example, that a predefined number of cycles has been reached. A service notification can also be output if a maintenance cycle has expired (for example, 6 months).

[0049] For some purposes during maintenance, compressed air can also be actively introduced into the oil-water separator. The maintenance personnel can input the corresponding service command into the control unit 60, which generates a control command to start introducing compressed air 14. For example, if the main filter 30 is a filter cartridge, the condensate inside it can be emptied to facilitate the replacement of a new main filter 30. Otherwise, if the main chamber 24 is emptied by a pump in order to replace the main filter 30, backflow may occur.

[0050] The valves used in the above embodiments of the present invention are merely examples and are not limited to a specific type of valve. For example, the solenoid valve 72 may also be configured like the piston valve module 50. In addition, other types of valves, such as ball valves, sliding gate valves, pinch valves, etc., may also be used for the above two valves.

[0051] The applicant further declares that the present invention illustrates the implementation method and device structure of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned implementation methods, that is, it does not mean that the present invention must rely on the above-mentioned methods and structures to be implemented. Those skilled in the art should understand that any improvement to the present invention, equivalent replacement of the implementation method selected by the present invention, addition of steps, selection of specific methods, etc., all fall within the scope of protection and disclosure of the present invention.

[0052] The present invention is not limited to the above-mentioned embodiments. All methods that use similar structures and methods to the present invention to achieve the purpose of the present invention are within the scope of protection of the present invention. For example, in the part of the present application regarding the piston valve module, various valves can be directly set to cooperate with pipelines to realize the opening / closing of the gas circuit and the liquid circuit. These methods are also within the scope of protection of the present invention.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oil-water separator that uses compressed air for active pressurization, comprising a main filter (30) connected to the oil-water separator for separating oil components in condensate, characterized in that: The oil-water separator has a control unit (60), and the control unit (60) controls compressed air to enter the oil-water separator to push condensate through the main filter (30).

2. The oil-water separator using compressed air for active pressurization according to claim 1, characterized in that: A liquid level sensor (64) for detecting the liquid level of condensate is arranged in the oil-water separator, and the liquid level sensor (64) is connected to the control unit (60).

3. The oil-water separator using compressed air for active pressurization according to claim 2, characterized in that: The liquid level sensor (64) is provided with a maximum working liquid level A, and when the control unit (60) detects that the condensate liquid level has reached a predetermined maximum working liquid level A, the compressed air is controlled to enter the oil-water separator.

4. The oil-water separator using compressed air for active pressurization according to claim 2, characterized in that: The liquid level sensor (64) is provided with a minimum working liquid level B, and when the control unit (60) detects that the condensate liquid level has reached a predetermined minimum working liquid level B, the compressed air is stopped from entering the oil-water separator.

5. The oil-water separator using compressed air for active pressurization according to claim 1, characterized in that: The oil-water separator comprises a housing (20), wherein the housing (20) has a main chamber (24) for condensate to enter; The housing (20) has a condensate inlet (22) for allowing condensate to enter the main chamber (24); The housing (20) has a housing connection port (23) for conveying condensate from the main chamber (24) to the main filter (30); The control unit (60) controls compressed air to enter the main chamber (24) in the housing (20) and pushes condensate from the main chamber (24) into the main filter (30) through the housing connection port (23).

6. The oil-water separator using compressed air for active pressurization according to claim 5, characterized in that: Compressed air and condensate enter the main chamber (24) through a piston valve module (50); the piston valve module (50) comprises a compressed air chamber (52) and a condensate chamber (53) separated by a piston (54); The piston valve module (50) further comprises: a condensate inlet (55) for allowing condensate to enter the condensate chamber (53); A compressed air inlet (58) for admitting compressed air into the compressed air chamber (52); Discharge condensate from the condensate chamber (53) to a condensate outlet (56) of the main chamber (24); Discharge compressed air from the compressed air chamber (52) to a compressed air outlet (57) of the main chamber (24); When compressed air enters the compressed air chamber (52), the compressed air pushes the piston (54) to block the condensate inlet (55).

7. The oil-water separator using compressed air for active pressurization according to claim 6, characterized in that: The opening cross-sectional area of ​​the compressed air outlet (57) is smaller than the opening cross-sectional area of ​​the compressed air inlet (58).

8. The oil-water separator using compressed air for active pressurization according to claim 5, characterized in that: The housing (20) has a pressure relief chamber (21), and the pressure relief chamber (21) is connected to the condensate inlet (22) and the main chamber (24).

9. The oil-water separator using compressed air for active pressurization according to claim 5, characterized in that: The housing (20) is provided with an oil discharge pipe (71) for discharging the floating oil layer.

10. The oil-water separator using compressed air for active pressurization according to claim 1, characterized in that: The main filter (30) is detachably connected to the oil-water separator.

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