Gas source purification device and control method thereof

Abstract

The invention discloses an air source purification device and a control method thereof, and belongs to the technical field of compressed air purification treatment.The air source purification device comprises a base, the base is provided with an air inlet and an air outlet, and the base is provided with a left air inlet channel, a right air inlet channel, a left exhaust channel, a right exhaust channel, a regeneration channel, a left pilot channel and a right pilot channel; the regeneration channel is arranged between the left exhaust channel and the right exhaust channel; the purification mechanism is arranged on the base and comprises a steam-water separator and an oil removal filter, the air inlet is communicated with the steam-water separator, the steam-water separator is communicated with the oil removal filter, and the oil removal filter is communicated with the left air inlet channel and the right air inlet channel; and the left drying cylinder and the right drying cylinder are both arranged on the base, and the air inlet end of the left drying cylinder and the air inlet end of the right drying cylinder communicate with the left air inlet channel and the right air inlet channel correspondingly.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air purification and processing, and in particular to an air source purification device and a control method thereof. Background Art

[0002] As the core equipment for supplying dry and clean compressed air to brake systems, instruments, air springs, pneumatic doors and other components, vehicle-mounted air source purification devices are widely used in various types of vehicles. With the increasing popularity of air brake technology and air spring technology, vehicle-mounted compressed air dryers have become key components related to vehicle safety, and their performance and reliability have attracted more and more attention from major automakers.

[0003] Due to the structural characteristics, the traditional single-tank dryer can only passively switch between adsorption and regeneration through a mechanical release valve, and only has the function of adsorbing gaseous water, and has no filtering effect on liquid water, dust and oil mist. The double-tank dryers on the market can achieve continuous adsorption and regeneration, but their control function is single and cannot complete active switching and complex functions. At the same time, their single function of adsorbing gaseous water is difficult to meet customers' increasing demand for purification device functions. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an air source purification device and a control method thereof, which can integrate multiple functions of dust removal, water removal and oil removal, and the filter element has a long service life and strong safety and reliability.

[0005] According to the first aspect of the present invention, the air source purification device comprises: a base, an air inlet and an air outlet are provided on the base, a left air inlet channel, a right air inlet channel, a left exhaust channel, a right exhaust channel, a regeneration channel, a left pilot channel and a right pilot channel are provided on the base, and the regeneration channel is arranged between the left exhaust channel and the right exhaust channel; a purification mechanism, the purification mechanism is arranged on the base, the purification mechanism comprises a steam-water separator and an oil removal filter, the air inlet is connected with the steam-water separator, the steam-water separator is connected with the oil removal filter, and the oil removal filter is connected with both the left air inlet channel and the right air inlet channel; a left drying cylinder and a right drying cylinder, the left drying cylinder and the right drying cylinder are both arranged on the base, and the left drying cylinder The air inlet ends of the drying cylinder and the right drying cylinder are connected to the left air inlet channel and the right air inlet channel respectively, the exhaust ends of the left drying cylinder and the right drying cylinder are connected to the left exhaust channel and the right exhaust channel respectively, both the left exhaust channel and the right exhaust channel are connected to the air outlet, the left air intake control valve and the right air intake control valve, the left air intake control valve is arranged in the left pilot channel, and the right air intake control valve is arranged in the right pilot channel; the left intake piston and the right intake piston, the left intake piston is arranged in the left intake channel, and the right intake piston is arranged in the right intake channel, both the left intake piston and the right intake piston are connected to the exhaust port, and the piston valve cores of the left intake piston and the right intake piston are controlled by the left pilot channel and the right pilot channel respectively.

[0006] The air source purification device according to the embodiment of the present invention has at least the following beneficial effects: by introducing two two-position three-way solenoid valves to independently control the left air intake control valve and the right air intake control valve, the problems of switching delay and inadequate switching in the existing scheme are improved, and the reliability of equipment operation is improved. The independent air intake control valve solves the problem of pressure relief of vehicles where the existing compressed air purification equipment with continuous air supply cannot realize the synchronous operation of the vehicle-mounted air compressor and the engine, ensures stable air replenishment when the air pressure at the air end of such vehicles drops, and the front-end pressure is released when the air pressure at the air end reaches, ensuring the safe and reliable operation of the air source system. The left air intake control valve and the right air intake control valve are independently provided with exhaust mufflers, shortening the exhaust path and regenerating more thoroughly, while avoiding the problem of contamination of another valve body due to unclean regenerated gas in a certain cavity. The piston valve core adopts riveting and nut fastening method to reduce the number of parts, reduce the size of the valve core, and then reduce the size of the valve body, improve the integration of the equipment, and at the same time adopt riveting structure to improve the production process, improve the assembly consistency of the valve core assembly, and improve product quality.

[0007] According to some embodiments of the present invention, a first one-way valve is provided between the steam-water separator and the oil removal filter.

[0008] According to some embodiments of the present invention, the purification mechanism further includes a drain valve, the water vapor separator is connected to the drain valve, and the oil removal filter is connected to the drain valve via a second one-way valve.

[0009] According to some embodiments of the present invention, a third one-way valve and a fourth one-way valve are respectively provided on the left exhaust passage and the right exhaust passage.

[0010] According to some embodiments of the present invention, a muffler is provided on the exhaust port.

[0011] According to some embodiments of the present invention, a throttle valve is provided on the regeneration passage.

[0012] According to some embodiments of the present invention, dust removal filters are provided in both the left drying cylinder and the right drying cylinder.

[0013] A control method for an air source purification device according to a second aspect of the present invention includes:

[0014] The air inlet on the base is connected to the front-end air supply equipment. The compressed air first passes through the steam-water separator to separate most of the liquid, and then passes through the oil removal filter to separate the remaining liquid accumulation. The liquid separated by the oil removal filter passes through the second one-way valve and is discharged from the drain valve.

[0015] The left air intake control valve loses power, the right air intake control valve gains power, and the air source purification device enters state 1: at this time, the piston valve core of the left air intake piston moves under the action of the spring force, so that the left air intake channel is in an open state, and the compressed air enters the left drying cylinder through the left air intake channel and is adsorbed in the left drying cylinder; at the same time, the right air intake valve gains power to open the right pilot channel, and the high-pressure pilot air in the right pilot channel pushes the piston valve core of the right air intake piston to move, blocking the right air intake channel and isolating the right drying cylinder from the undried compressed air; part of the compressed air dried by the left drying cylinder passes through the left exhaust channel, and the other part passes through the regeneration channel to enter the right drying cylinder for regeneration, and the regenerated exhaust gas passes through the right intake piston and the muffler and is discharged;

[0016] The left air intake control valve is energized, the right air intake control valve is de-energized, and the air source purification device enters state two: at this time, the piston valve core of the right air intake piston moves under the action of the spring force, so that the right air intake channel is in an open state, and the compressed air enters the right drying cylinder through the right air intake channel and is adsorbed in the right drying cylinder; at the same time, the left air intake valve is energized to open the left pilot channel, and the high-pressure pilot air in the left pilot channel pushes the piston valve core of the left air intake piston to move, blocking the left air intake channel and isolating the left drying cylinder from the undried compressed air; part of the compressed air dried by the right drying cylinder passes through the right exhaust channel, and the other part passes through the regeneration channel to enter the left drying cylinder for regeneration, and the regenerated exhaust gas passes through the left intake piston and the muffler and is discharged;

[0017] The gas source purification device switches alternately between state one and state two to achieve continuous gas supply.

[0018] According to some embodiments of the present invention, the air source purification device receives a pressure feedback signal from a rear-end air storage device. When the pressure of the rear-end air storage device is higher than the set pressure for stopping the air supply, the control valve and the right air intake control valve are both energized, and the air source purification device enters state four: the piston valve cores of the left air intake piston and the right air intake piston respectively block the left air intake channel and the right air intake channel to prevent compressed air from continuing to enter the rear-end air storage device and causing excessive pressure in the rear-end air-using equipment, resulting in safety hazards. At the same time, the drain valve is energized to open, and the compressed air continuously supplied by the air compressor is discharged into the atmosphere through the drain valve.

[0019] According to some embodiments of the present invention, the left air intake control valve and the right air intake control valve both lose power, and the air source purification device enters state four: at this time, the piston valve cores of the left air intake piston and the right air intake piston are moved by the spring force, the left air intake channel and the right air intake channel are both opened, and the left drying cylinder and the right drying cylinder are connected to the undried compressed air at the same time, and the unpurified compressed air is continuously supplied to the rear-end gas consumption points to ensure that the vehicle still has stable pressure gas to use when the air source system is in an abnormal state.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0022] Figure 1 is a schematic structural diagram of an air source purification device according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Right view of;

[0024] Figure 3 yes Figure 2 A cross-sectional view of

[0025] Figure 4 yes Figure 1 A cross-sectional view of

[0026] Figure 5 It is the hydraulic principle diagram of the air source purification device in the operating state 1;

[0027] Figure 6 It is the hydraulic principle diagram of the air source purification device in the second operating state;

[0028] Figure 7 This is the hydraulic principle diagram of the air source purification device in operating state three;

[0029] Figure 8 It is the hydraulic principle diagram of the fourth operating state of the air source purification device. Description of the drawings:

[0031] Base 100; air inlet 111; air outlet 112; left air inlet channel 121; right air inlet channel 122; left exhaust channel 123; right exhaust channel 124; regeneration channel 125; left pilot channel 126; right pilot channel 127; third one-way valve 128; fourth one-way valve 129; throttle valve 130;

[0032] Purification mechanism 200; steam-water separator 210; oil removal filter 220; first one-way valve 230; second one-way valve 240; drain valve 250;

[0033] Left drying cylinder 310; right drying cylinder 320; dust removal filter 330;

[0034] Left air intake control valve 410; right air intake control valve 420;

[0035] Left air intake piston 510 ; right air intake piston 520 ; exhaust port 530 ; muffler 531 ; piston valve core 540 . DETAILED DESCRIPTION

[0036] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] refer to Figures 1 to 8 An air source purification device and a control method thereof according to an embodiment of the present invention are described.

[0041] like Figures 1 to 8As shown, the air source purification device according to the embodiment of the present invention comprises: a base 100, an air inlet 111 and an air outlet 112 are provided on the base 100, a left air inlet channel 121, a right air inlet channel 122, a left exhaust channel 123, a right exhaust channel 124, a regeneration channel 125, a left pilot channel 126 and a right pilot channel 127 are provided on the base 100, and the regeneration channel 125 is arranged between the left exhaust channel 123 and the right exhaust channel 124; a purification mechanism 2 00, the purification mechanism 200 is arranged on the base 100, the purification mechanism 200 includes a steam-water separator 210 and an oil removal filter 220, the air inlet 111 is connected to the steam-water separator 210, the steam-water separator 210 is connected to the oil removal filter 220, the oil removal filter 220 is connected to both the left air inlet channel 121 and the right air inlet channel 122; the left drying cylinder 310 and the right drying cylinder 320, both of which are arranged on the base 100, The air inlet ends of the left drying cylinder 310 and the right drying cylinder 320 are respectively connected to the left air inlet channel 121 and the right air inlet channel 122, and the exhaust ends of the left drying cylinder 310 and the right drying cylinder 320 are respectively connected to the left exhaust channel 123 and the right exhaust channel 124, and the left exhaust channel 123 and the right exhaust channel 124 are both connected to the air outlet 112, and the left air intake control valve 410 and the right air intake control valve 420 are respectively connected to the left pilot channel 126 and the right pilot channel 126. The air control valve 420 is arranged in the right pilot channel 127; the left intake piston 510 and the right intake piston 520, the left intake piston 510 is arranged in the left intake channel 121, and the right intake piston 520 is arranged in the right intake channel 122, the left intake piston 510 and the right intake piston 520 are both connected to the exhaust port 530, and the piston valve core 540 of the left intake piston 510 and the right intake piston 520 are respectively controlled by the left pilot channel 126 and the right pilot channel 127.

[0042] like Figures 1 to 8 As shown, a first one-way valve 230 is provided between the steam-water separator 210 and the oil removal filter 220. The purification mechanism 200 also includes a drain valve 250, the steam separator is connected to the drain valve 250, and the oil removal filter 220 is connected to the drain valve 250 through the second one-way valve 240. A third one-way valve 128 and a fourth one-way valve 129 are provided on the left exhaust channel 123 and the right exhaust channel 124, respectively. A muffler 531 is provided on the exhaust port 530. A throttle valve 130 is provided on the regeneration channel 125. Dust removal filters 330 are provided in both the left drying cylinder 310 and the right drying cylinder 320.

[0043] like Figures 1 to 8 As shown, a control method of an air source purification device according to an embodiment of the present invention includes:

[0044] The air inlet 111 on the base 100 is connected to the front-end air supply device. The compressed air first passes through the steam-water separator 210 to complete the separation of most of the liquid, and then passes through the oil removal filter 220 to complete the separation of the remaining liquid accumulation. The liquid separated by the oil removal filter 220 passes through the second one-way valve 240 and is discharged by the drain valve 250;

[0045] The left air intake control valve 410 loses power, the right air intake control valve 420 gains power, and the air source purification device enters state one: at this time, the piston valve core 540 of the left air intake piston 510 moves under the action of the spring force, so that the left air intake channel 121 is in an open state, and the compressed air enters the left drying cylinder 310 through the left air intake channel 121, and is adsorbed in the left drying cylinder 310; at the same time, the right air intake valve gains power to open the right pilot channel 127, and the high-pressure pilot air in the right pilot channel 127 pushes the piston valve core 540 of the right air intake piston 520 to move, blocking the right air intake channel 122, isolating the right drying cylinder 320 from the undried compressed air; a part of the compressed air dried by the left drying cylinder 310 passes through the left exhaust channel 123, and the other part passes through the regeneration channel 125 to enter the right drying cylinder 320 for regeneration, and the regenerated exhaust gas passes through the right intake piston 520 and the muffler 531 and is discharged;

[0046] The left air intake control valve 410 is energized, the right air intake control valve 420 is de-energized, and the air source purification device enters state 2: at this time, the piston valve core 540 of the right air intake piston 520 moves under the action of the spring force, so that the right air intake channel 122 is in an open state, and the compressed air enters the right drying cylinder 320 through the right air intake channel 122, and is adsorbed in the right drying cylinder 320; at the same time, the left air intake valve is energized to open the left pilot channel 126, and the high-pressure pilot air in the left pilot channel 126 pushes the piston valve core 540 of the left air intake piston 510 to move, blocking the left air intake channel 121, and isolating the left drying cylinder 310 from the undried compressed air; a part of the compressed air dried by the right drying cylinder 320 passes through the right exhaust channel 124, and the other part passes through the regeneration channel 125 to enter the left drying cylinder 310 for regeneration, and the regenerated exhaust gas passes through the left intake piston 510 and the muffler 531 and is discharged;

[0047] The gas source purification device switches alternately between state one and state two to achieve continuous gas supply.

[0048] like Figure 7As shown, the gas source purification device receives the pressure feedback signal of the rear-end gas storage equipment. When the pressure of the rear-end gas storage equipment is higher than the set pressure for stopping gas supply, the control valve and the right air intake control valve 420 are both energized, and the gas source purification device enters state four: the piston valve cores 540 of the left air intake piston 510 and the right air intake piston 520 respectively block the left air intake channel 121 and the right air intake channel 122 to prevent the compressed air from continuing to enter the rear-end gas storage equipment and causing excessive pressure in the rear-end gas-using equipment, resulting in safety hazards. At the same time, the drain valve 250 is energized to open, and the compressed air continuously supplied by the air compressor is discharged into the atmosphere through the drain valve 250.

[0049] like Figure 8 As shown, the left air intake control valve 410 and the right air intake control valve 420 both lose power, and the air source purification device enters state four: at this time, the piston valve cores 540 of the left air intake piston 510 and the right air intake piston 520 move under the action of the spring force, the left air intake channel 121 and the right air intake channel 122 are both opened, and the left drying cylinder 310 and the right drying cylinder 320 are connected to the undried compressed air at the same time, and the compressed air that is not completely purified is continuously supplied to the rear-end gas consumption point, so as to ensure that the vehicle still has stable pressure gas to use when the air source system is in an abnormal state.

[0050] For vehicles with independent working of onboard air compressor and engine, this air source purification device normally switches alternately between state 1 and state 2 to realize continuous air supply. When encountering an emergency, this air source purification device operates in state 4. At this time, the air source purification device is in emergency state, and continuously supplies compressed air that is not completely purified to the rear-end gas point to ensure that the vehicle still has stable pressure gas for use when the air source system is in abnormal state, and is used for emergency situations.

[0051] For vehicles with on-board air compressors and engines working synchronously, the operating principle of the air source purification device includes state one, state two, state three, and state four. Among them, the control methods of state one, state two, and state four are the same as the control methods of vehicles with on-board air compressors and engines working independently. In the operating state three, the air source purification device receives the pressure feedback signal of the rear-end gas storage device. When the pressure of the rear-end gas storage device is higher than the set pressure for stopping the gas supply, the left air intake control valve 410 and the right air intake control valve 420 are energized at the same time, and the piston valve cores 540 of the left air intake piston 510 and the right air intake piston 520 respectively block the left air intake channel 121 and the right air intake channel 122 to prevent the compressed air from continuing to enter the rear-end gas storage device and causing the pressure of the rear-end gas-using equipment to be too high, resulting in safety hazards. At the same time, the drain valve 250 is energized to open, and the compressed air continuously supplied by the air compressor is discharged into the atmosphere through the drain valve 250, ensuring that the entire air source system works under a reliable pressure state. When the vehicle continues to use gas and the pressure of the rear-end gas storage equipment drops to the set pressure for continued gas supply, the gas source purification device receives the pressure feedback signal of the rear-end gas storage equipment, and the control state switches between state one and state two again to ensure that clean and dry compressed air continues to be provided to the rear-end gas storage equipment.

[0052] Therefore, the air source purification device introduces two two-position three-way solenoid valves to independently control the left air intake control valve 410 and the right air intake control valve 420, thereby improving the problems of delayed switching and inadequate switching in the existing scheme and improving the reliability of equipment operation. The independent air intake control valve solves the problem of pressure relief in vehicles where the existing compressed air purification equipment with continuous air supply cannot realize the synchronous operation of the on-board air compressor and the engine, ensures stable air replenishment when the air pressure at the air end of such vehicles drops, and releases the front pressure when the air pressure at the air end reaches, ensuring the safe and reliable operation of the air source system. The left air intake control valve 410 and the right air intake control valve 420 are independently provided with exhaust mufflers 531, shortening the exhaust path and regenerating more thoroughly, while avoiding the problem of contamination of another valve body due to unclean regenerated gas in a certain cavity. The piston valve core 540 adopts riveting and nut fastening method to reduce the number of parts, reduce the size of the valve core, and then reduce the size of the valve body, improve the integration of the equipment, and at the same time adopt a riveting structure to improve the production process, improve the assembly consistency of the valve core component, and improve product quality.

[0053] Two two-position three-way solenoid valves are used to independently control the operation of the left intake control valve 410 and the right intake control valve 420, and various control actions of the left intake control valve 410 and the right intake control valve 420 can be realized, such as simultaneous opening, simultaneous closing, left open and right closed, and left closed and right open; the control air path is greatly shortened, and the piston valve core 540 moves without delay, thereby solving the problem of discontinuous air supply; the simultaneous closing function of the left intake control valve 410 and the right intake control valve 420 can cover vehicles with synchronous operation of the air compressor and the engine, thereby avoiding driving safety hazards caused by continuous compressed air supply to the rear-end gas consumption point; the left intake control valve 410 and the right intake control valve 420 are independently equipped with a muffler 531 with a small discharge stroke, which can quickly realize the pressure relief of the dryer cylinder and ensure complete regeneration of the dryer cylinder.

[0054] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A gas source purification device, characterized in that: include: A base, an air inlet and an air outlet are provided on the base, a left air inlet channel, a right air inlet channel, a left exhaust channel, a right exhaust channel, a regeneration channel, a left pilot channel and a right pilot channel are provided on the base, and the regeneration channel is arranged between the left exhaust channel and the right exhaust channel; The purification mechanism is arranged on the base, and the purification mechanism includes a steam-water separator and an oil removal filter. The air inlet is connected to the steam-water separator, the steam-water separator is connected to the oil removal filter, and the oil removal filter is connected to both the left air inlet channel and the right air inlet channel; The left drying cylinder and the right drying cylinder are both arranged on the base, the air inlet ends of the left drying cylinder and the right drying cylinder are respectively connected with the left air inlet channel and the right air inlet channel, the exhaust ends of the left drying cylinder and the right drying cylinder are respectively connected with the left exhaust channel and the right exhaust channel, and the left exhaust channel and the right exhaust channel are both connected with the air outlet, a left air intake control valve and a right air intake control valve, wherein the left air intake control valve is arranged in the left pilot passage, and the right air intake control valve is arranged in the right pilot passage; A left intake piston and a right intake piston, the left intake piston is arranged in the left intake channel, the right intake piston is arranged in the right intake channel, the left intake piston and the right intake piston are both connected with exhaust ports, and the piston valve cores of the left intake piston and the right intake piston are respectively controlled by the left pilot channel and the right pilot channel.

2. The air source purification device according to claim 1, characterized in that: A first one-way valve is arranged between the steam-water separator and the oil removal filter.

3. The air source purification device according to claim 2, characterized in that: The purification mechanism also includes a drain valve, the water vapor separator is connected to the drain valve, and the oil removal filter is connected to the drain valve through a second one-way valve.

4. The air source purification device according to claim 3, characterized in that: A third one-way valve and a fourth one-way valve are respectively arranged on the left exhaust passage and the right exhaust passage.

5. The air source purification device according to claim 4, characterized in that: A muffler is provided on the exhaust gas outlet.

6. The air source purification device according to claim 5, characterized in that: A throttle valve is provided on the regeneration passage.

7. The air source purification device according to claim 5, characterized in that: Dust removal filters are provided in both the left drying cylinder and the right drying cylinder.

8. A control method for an air source purification device, characterized in that: The air source purification device is the air source purification device according to claim 6, and the control method comprises: The air inlet on the base is connected to the front-end air supply equipment. The compressed air first passes through the steam-water separator to separate most of the liquid, and then passes through the oil removal filter to separate the remaining liquid accumulation. The liquid separated by the oil removal filter passes through the second one-way valve and is discharged from the drain valve. The left air intake control valve loses power, the right air intake control valve gains power, and the air source purification device enters state 1: at this time, the piston valve core of the left air intake piston moves under the action of the spring force, so that the left air intake channel is in an open state, and the compressed air enters the left drying cylinder through the left air intake channel and is adsorbed in the left drying cylinder; at the same time, the right air intake valve gains power to open the right pilot channel, and the high-pressure pilot air in the right pilot channel pushes the piston valve core of the right air intake piston to move, blocking the right air intake channel and isolating the right drying cylinder from the undried compressed air; part of the compressed air dried by the left drying cylinder passes through the left exhaust channel, and the other part passes through the regeneration channel to enter the right drying cylinder for regeneration, and the regenerated exhaust gas passes through the right intake piston and the muffler and is discharged; The left air intake control valve is energized, the right air intake control valve is de-energized, and the air source purification device enters state two: at this time, the piston valve core of the right air intake piston moves under the action of the spring force, so that the right air intake channel is in an open state, and the compressed air enters the right drying cylinder through the right air intake channel and is adsorbed in the right drying cylinder; at the same time, the left air intake valve is energized to open the left pilot channel, and the high-pressure pilot air in the left pilot channel pushes the piston valve core of the left air intake piston to move, blocking the left air intake channel and isolating the left drying cylinder from the undried compressed air; part of the compressed air dried by the right drying cylinder passes through the right exhaust channel, and the other part passes through the regeneration channel to enter the left drying cylinder for regeneration, and the regenerated exhaust gas passes through the left intake piston and the muffler and is discharged; The gas source purification device switches alternately between state one and state two to achieve continuous gas supply.

9. The control method of the air source purification device according to claim 8, characterized in that: The air source purification device receives the pressure feedback signal of the rear-end air storage equipment. When the pressure of the rear-end air storage equipment is higher than the set pressure for stopping air supply, the control valve and the right air intake control valve are both energized, and the air source purification device enters state four: the piston valve cores of the left air intake piston and the right air intake piston respectively block the left air intake channel and the right air intake channel to prevent compressed air from continuing to enter the rear-end air storage equipment and causing excessive pressure in the rear-end air-using equipment, resulting in safety hazards. At the same time, the drain valve is energized to open, and the compressed air continuously supplied by the air compressor is discharged into the atmosphere through the drain valve.

10. The control method of the air source purification device according to claim 9, characterized in that: The left air intake control valve and the right air intake control valve both lose power, and the air source purification device enters state four: at this time, the piston valve cores of the left air intake piston and the right air intake piston move under the action of spring force, the left air intake channel and the right air intake channel are both opened, and the left dryer and the right dryer are connected to the undried compressed air at the same time, continuously supplying the compressed air that is not completely purified to the rear-end gas consumption point, to ensure that the vehicle still has stable pressure gas to use when the air source system is in an abnormal state.

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