A pressure energy-based car washing wastewater treatment system

Abstract

The application discloses a car washing wastewater treatment system based on pressure energy, which comprises a pressure energy unit, a filtering unit and an aeration unit; the pressure energy unit is used for converting mechanical energy generated by a vehicle into pressure energy; the filtering unit is used for filtering car washing wastewater to remove solid matters in the car washing wastewater; the aeration unit is used for aerating the filtered car washing wastewater to increase the dissolved oxygen content in the car washing wastewater, so as to accelerate the degradation of organic matters in the wastewater; the aeration unit is connected with the pressure energy unit, so that the pressure energy generated by the pressure energy unit can be used to drive the aeration unit to aerate. The application can convert the mechanical energy generated by the vehicle into pressure energy, and can treat the car washing wastewater by using the pressure energy, so that the energy consumption and operation cost can be effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and relates to car wash wastewater, and particularly to a car wash wastewater treatment system based on pressure energy. Background Technology

[0002] In recent years, the number of vehicles has continued to increase, and the car wash industry has also developed rapidly, making car wash water an important part of urban domestic water use.

[0003] Meanwhile, with the development of the car wash industry, self-service car wash machines have also come into view, allowing vehicles to be washed quickly while driving, greatly saving people's time. However, existing car washes either lack a wastewater treatment system, directly discharging the wastewater after washing, which mainly contains solids such as mud and sand and detergents, undoubtedly causing environmental pollution; or the existing wastewater treatment systems rely solely on electricity as an energy source, resulting in high energy consumption. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a car wash wastewater treatment system based on pressure energy. This invention can convert the mechanical energy generated by vehicle driving into pressure energy and use the pressure energy to treat car wash wastewater, which can effectively reduce energy consumption and operating costs.

[0005] The technical solution of this invention is implemented as follows:

[0006] A car wash wastewater treatment system based on pressure energy includes a pressure energy unit, a filtration unit, and an aeration unit.

[0007] The pressure energy unit is used to convert the mechanical energy generated by the vehicle into pressure energy.

[0008] The filtration unit is used to filter car wash wastewater to remove solids from it.

[0009] The aeration unit is used to aerate the filtered car wash wastewater to increase the dissolved oxygen content in the wastewater, thereby accelerating the degradation of organic matter in the wastewater; the aeration unit is connected to the pressure energy unit, so that the pressure energy generated by the pressure energy unit can be used to drive the aeration unit to aerate.

[0010] Furthermore, the pressure energy unit includes an oil tank, an accumulator, and several hydraulic cylinders.

[0011] All hydraulic cylinders are arranged in at least one row, with corresponding cylinders in each row. A lifting mechanism is provided at the bottom of the hydraulic cylinders in the same row to control the lifting and lowering of that row. A horizontal support plate is provided on the top of the piston cylinder of the hydraulic cylinders in the same row. The two ends of the whole formed by all the hydraulic cylinders in the row are the vehicle entrance end and the vehicle exit end, respectively. A weight sensor is provided at the vehicle entrance end to collect vehicle weight data. The weight sensor and all lifting mechanisms are connected to the controller, so that when the vehicle enters from the vehicle entrance end, the controller controls the lifting mechanism to raise and lower each row of hydraulic cylinders according to the received vehicle weight data, so that the vehicle can drive normally and exit from the vehicle exit end while compressing the hydraulic cylinders.

[0012] All hydraulic cylinder outlets are connected to the oil collection tank inlet via oil collection pipelines, facilitating the delivery of hydraulic fluid from the vehicle's hydraulic cylinders to the oil collection tank for storage. The oil collection tank outlet is connected to the accumulator inlet via oil delivery pipelines, facilitating the delivery of oil from the oil collection tank to the accumulator for compression, converting the oil into high-pressure oil for storage in the accumulator.

[0013] Furthermore, it also includes a wastewater treatment tank with an open top surface. The filtration unit includes a first filter screen, which is set on the top of the wastewater treatment tank to close the top surface of the wastewater treatment tank, so that the car wash wastewater can be filtered when it enters the wastewater treatment tank from the top surface. The bottom of the wastewater treatment tank is provided with a drain outlet for connecting a drain pipe to discharge the water in the wastewater treatment tank.

[0014] Furthermore, it also includes a cleaning unit, which includes a cleaning water compression chamber located on one side of the first filter screen. The cleaning water compression chamber has an inlet on one side wall, and the inlet of the cleaning water compression chamber is connected to the wastewater treatment tank through a pipeline, so that water in the wastewater treatment tank can enter the cleaning water compression chamber.

[0015] The front end of the cleaning water compression chamber is provided with a water spray nozzle, and the rear end of the cleaning water compression chamber is connected to the first oil outlet of the accumulator through a first pipeline, and a first solenoid valve is provided on the first pipeline; a first piston is provided in the cleaning water compression chamber, and the first piston divides the cleaning water compression chamber into front and rear chambers. A first spring is provided in the front chamber of the cleaning water compression chamber, and the first spring is horizontally arranged with its two ends connected to the first piston and the corresponding inner wall of the cleaning water compression chamber, respectively.

[0016] Furthermore, a collection box is detachably installed on the side wall of the wastewater treatment tank opposite the cleaning water compression chamber for collecting solids washed off from the first filter screen.

[0017] Furthermore, the first filter screen has vertical baffles on both sides to ensure that all cleaning water and solids enter the collection box. At the same time, the bottom of the collection box has a water outlet, and a second filter screen is installed at the water outlet. The water outlet is connected to the wastewater treatment tank through a return water pipe, which facilitates the return of the cleaning water in the collection box to the wastewater treatment tank.

[0018] Furthermore, the aeration unit includes a gas compression chamber, which is located on the side wall of the wastewater treatment tank and partially within the wastewater treatment tank. The front side wall of the gas compression chamber is provided with an air inlet, which is connected to an air inlet pipe. The air inlet pipe communicates with the outside air to facilitate the entry of gas into the gas compression chamber.

[0019] The front end of the gas compression chamber is provided with several jet nozzles, and the rear end of the gas compression chamber is connected to the second oil outlet of the accumulator through a second pipeline. A second solenoid valve is provided on the second pipeline. A second piston is provided in the gas compression chamber, which divides the gas compression chamber into front and rear chambers. A second spring is provided in the front chamber of the gas compression chamber. The second spring is horizontally arranged and its two ends are respectively connected to the second piston and the corresponding inner wall of the gas compression chamber.

[0020] Furthermore, a check valve is installed on the oil collection line to prevent the oil in the oil collection tank from flowing back into the hydraulic cylinder.

[0021] Furthermore, it also includes an oil distribution tank. The return port of the accumulator and the inlet of the oil distribution tank are connected through a first return oil pipe. A third solenoid valve and a pressure switch are installed on the first return oil pipe. The pressure switch is located near the return port of the accumulator and is used to detect the oil pressure in the accumulator. The third solenoid valve and the pressure switch are connected to the controller. When the pressure switch detects that the oil pressure in the accumulator is less than a set value, it controls the third solenoid valve to open so that the oil in the accumulator flows back to the oil distribution tank. The oil distribution tank has an outlet that corresponds to each hydraulic cylinder. Each outlet of the oil distribution tank and the corresponding inlet of the hydraulic cylinder are connected through a second return oil pipe. A check valve is installed on the second return oil pipe to prevent the oil in the hydraulic cylinder from entering the oil distribution tank.

[0022] Furthermore, the side walls of the cleaning water compression chamber and the gas compression chamber corresponding to the water inlet and the air inlet are provided with inlets for the entry of cleaning water or gas and plugs for sealing the inlets. The plugs are inclinedly arranged on one side of the inlet and are connected to the outside of the inlet. A plug is provided inside the plug, which can reciprocate within the plug, so as to facilitate the opening and closing of the inlet during the reciprocating movement of the first piston or the second piston. At least two limiting grooves are provided on the side wall of the compression chamber corresponding to the plug along the length direction of the plug. Correspondingly, guide blocks are provided on the plug that correspond one-to-one with the limiting grooves. The plug guide blocks are placed on the limiting grooves, so that the plug can only reciprocate within the range of the limiting grooves.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This invention filters car wash wastewater through a filtration unit to remove solids such as mud and sand, and then aerates the filtered car wash wastewater through an aeration unit to increase the dissolved oxygen content, thereby accelerating the degradation of organic matter in the car wash wastewater and achieving the purpose of treating car wash wastewater.

[0025] 2. The pressure energy unit of the present invention utilizes the mechanical energy generated when the vehicle is driving in the car wash and converts it into pressure energy. The pressure energy is used to aerate the car wash wastewater and clean the filter unit, without wasting electrical energy, thereby effectively reducing energy consumption and operating costs. Attached Figure Description

[0026] Figure 1 - A schematic diagram of the structure of the present invention.

[0027] Figure 2 - A schematic diagram of the cleaning unit.

[0028] Figure 3 - A schematic diagram of the aeration unit.

[0029] Wherein: 1-Vehicle entrance; 2-Weight sensor; 3-Support plate; 4-Hydraulic cylinder; 5-Lifting mechanism; 6-Vehicle exit; 7-Second return oil line; 8-Accumulator; 9-Second solenoid valve; 10-First solenoid valve; 11-Oil distribution tank; 12-Oil collection tank; 13-Aeration unit; 13a-Gas compression chamber; 13b-Second piston; 13c-Air inlet; 13d-Second spring; 13e-Air nozzle; 14-Wastewater treatment tank; 15-Collection box; 16-First filter screen; 17-Cleaning unit; 17a-Cleaning water compression chamber; 17b-First piston; 17c-Water inlet; 17d-First spring; 17e-Water spray nozzle; 18-One-way valve; 19-First return oil line; 20-Third solenoid valve; 21-Pressure switch. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] See Figure 1 , Figure 2 and Figure 3 A pressure energy-based car wash wastewater treatment system includes a pressure energy unit, a filtration unit, and an aeration unit.

[0032] The pressure energy unit is used to convert the mechanical energy generated by the vehicle into pressure energy.

[0033] The filtration unit is used to filter car wash wastewater to remove solids from it.

[0034] The aeration unit 13 is used to aerate the filtered car wash wastewater to increase the dissolved oxygen content in the wastewater, thereby accelerating the degradation of organic matter in the wastewater; the aeration unit 13 is connected to the pressure energy unit, so that the pressure energy generated by the pressure energy unit can be used to drive the aeration unit 13 to aerate.

[0035] In this way, the filtration unit filters the car wash wastewater, removing solids such as mud and sand. Then, the aeration unit aerates the wastewater to increase its dissolved oxygen content, thereby accelerating the degradation of organic matter and achieving the goal of treating the wastewater. Here, the pressure energy unit utilizes the mechanical energy generated by vehicle movement and converts it into pressure energy. This pressure energy drives the aeration unit, effectively saving electricity consumption and achieving energy conservation and reduced operating costs.

[0036] In specific implementation, the pressure energy unit includes an oil collection tank 12, an accumulator 8, and several hydraulic cylinders 4.

[0037] All hydraulic cylinders 4 are arranged in at least one row, and the hydraulic cylinders 4 in all rows are correspondingly arranged. A lifting mechanism 5 is provided at the bottom of the hydraulic cylinders 4 in the same row to control the lifting and lowering of the hydraulic cylinders 4 in that row. A support plate 3 is horizontally provided on the top of the piston cylinder of the hydraulic cylinder 4 in the same row. The two ends of the whole formed by all rows of hydraulic cylinders 4 are the vehicle entrance end 1 and the vehicle exit end 6, respectively. A weight sensor 2 is provided at the vehicle entrance end 1 to collect vehicle weight data. The weight sensor 2 and all lifting mechanisms 5 are connected to the controller, so that when the vehicle enters from the vehicle entrance end, the controller controls the lifting mechanism 5 to lift and lower each row of hydraulic cylinders 4 according to the received vehicle weight data, so that the vehicle can drive normally and exit from the vehicle exit end while compressing the hydraulic cylinders 4.

[0038] All hydraulic cylinders 4 have their oil outlets connected to the oil inlet of the oil collection tank 12 via oil collection pipelines, which facilitates the delivery of oil from the vehicle's hydraulic cylinders to the oil collection tank 12 for storage. The oil outlet of the oil collection tank 12 is connected to the oil inlet of the accumulator 8 via an oil delivery pipeline, which facilitates the delivery of oil from the oil collection tank 12 to the accumulator 8 for compression to convert it into high-pressure oil for storage in the accumulator 8.

[0039] Here, the self-service car wash machine can be set up on a sloping surface, with the vehicle entrance at the higher end and the vehicle exit at the lower end. A recess is excavated in the ground below the self-service car wash machine to house the lifting mechanism and hydraulic cylinders. The support plate on the row of hydraulic cylinders near the vehicle entrance is flush with the ground surface at the entrance, allowing vehicles to drive normally into the self-service car wash area. As the vehicle enters the self-service car wash area, it compresses the hydraulic cylinders during its movement, converting the work done by the vehicle into pressure energy. To ensure normal vehicle operation, the controller will pre-lower the height of the lifting mechanism below the hydraulic cylinders. The lowering height increases sequentially from the vehicle entrance to the vehicle exit. The resulting effect is shown in the diagram below. Figure 1 As shown, the support plate on the last stage hydraulic cylinder is flush with the ground at the vehicle's exit end, allowing the vehicle to drive out normally after washing, thus completing the washing process. This converts some of the mechanical energy during the vehicle washing process into kinetic energy, which is then stored in the accumulator.

[0040] In a specific implementation, it also includes a wastewater treatment tank 14 with an open top surface. The filtration unit includes a first filter screen 16, which is set on the top of the wastewater treatment tank 14 to close the top surface of the wastewater treatment tank 14, so that the car wash wastewater can be filtered when it enters the wastewater treatment tank 14 from the top surface. The bottom of the wastewater treatment tank 14 is provided with a drain outlet for connecting a drain pipe to discharge the water in the wastewater treatment tank 14.

[0041] Here, the water discharged from the wastewater treatment pond can be directly reused for car washing, thus realizing the recycling of water resources.

[0042] In a specific implementation, it also includes a cleaning unit 17, which includes a cleaning water compression chamber 17a located on one side of the first filter screen 16. The cleaning water compression chamber 17a has a water inlet on one side wall. The water inlet of the cleaning water compression chamber is connected to the wastewater treatment tank 14 through a pipeline, so that the water in the wastewater treatment tank 14 can enter the cleaning water compression chamber 17a.

[0043] The front end of the cleaning water compression chamber 17a is provided with a water spray nozzle 17e, and the rear end of the cleaning water compression chamber 17a is connected to the first oil outlet of the accumulator 8 through a first pipeline, and a first solenoid valve 10 is provided on the first pipeline; a first piston 17b is provided inside the cleaning water compression chamber 17a, and the first piston 17b divides the cleaning water compression chamber 17a into front and rear chambers. A first spring 17c is provided in the front chamber of the cleaning water compression chamber 17a. The first spring 17c is horizontally arranged and its two ends are respectively connected to the first piston 17b and the corresponding inner wall of the cleaning water compression chamber 17a.

[0044] Here, the end where the water nozzle is located is the front end of the cleaning water compression chamber, and the end connected to the accumulator is the rear end of the cleaning water compression chamber. In this way, after the pressurized oil from the accumulator enters the rear chamber of the cleaning water compression chamber, it will push the first piston forward, compress the first spring, and at the same time spray the water in the front chamber of the cleaning water compression chamber onto the first filter screen to wash away the mud and other solids on the first filter screen. Then, the oil in the cleaning water compression chamber flows back to the accumulator. Under the action of the first spring, it pushes the first piston back to its original position and draws the water in the wastewater treatment tank into the front chamber of the cleaning water compression chamber.

[0045] In a specific implementation, a collection box 15 is detachably installed on the side wall of the wastewater treatment tank 14 on the opposite side of the cleaning water compression chamber 17a, for collecting solids washed off from the first filter screen 16.

[0046] In practice, the first filter screen 16 has vertical baffles (not shown in the figure) on both sides to ensure that all cleaning water and solids enter the collection box. At the same time, the bottom of the collection box 15 has a water outlet and a second filter screen is installed at the water outlet. The water outlet is connected to the wastewater treatment tank 14 through a return water pipe to facilitate the return of the cleaning water in the collection box 15 to the wastewater treatment tank 14.

[0047] For specific implementation, please refer to Figure 3 The aeration unit 13 includes a gas compression chamber 13a, which is located on the side wall of the wastewater treatment tank 14 and partially inside the wastewater treatment tank 14. The front side wall of the gas compression chamber 13a is provided with an air inlet 13c, which is connected to an air inlet pipe. The air inlet pipe is connected to the outside air to facilitate the entry of gas into the gas compression chamber 13a.

[0048] The front end of the gas compression chamber 13a is provided with several jet nozzles 13e. The rear end of the gas compression chamber 13a is connected to the second oil outlet of the accumulator 8 through a second pipeline. A second solenoid valve 9 is provided on the second pipeline. A second piston 13b is provided inside the gas compression chamber 13a. The second piston 13b divides the gas compression chamber 13a into front and rear chambers. A second spring 13d is provided in the front chamber of the gas compression chamber 13a. The second spring 13d is horizontally arranged and its two ends are respectively connected to the second piston 13b and the corresponding inner wall of the gas compression chamber 13a.

[0049] Here, the end where the jet nozzle is located is the front end of the gas compression chamber, and the end connected to the accumulator is the rear end of the gas compression chamber. After the pressurized oil from the accumulator enters the rear chamber of the gas compression chamber, it pushes the second piston forward, compressing the second spring. At the same time, it forces the gas in the front chamber of the gas compression chamber into the wastewater treatment tank, thereby aerating the water in the wastewater treatment tank. Then, the oil in the gas compression chamber flows back to the accumulator, and under the action of the second spring, it pushes the second piston back to its original position, drawing outside air into the front chamber of the gas compression chamber.

[0050] In practice, a one-way valve 18 is installed on the oil collection pipeline to prevent the oil in the oil collection tank 12 from flowing back to the hydraulic cylinder 4.

[0051] In specific implementation, it also includes an oil distribution tank 11. The return oil port of the accumulator 8 and the inlet of the oil distribution tank 11 are connected through a first return oil pipe. A third solenoid valve 20 and a pressure switch 21 are provided on the first return oil pipe 19. The pressure switch 21 is close to the return oil port of the accumulator and is used to detect the oil pressure in the accumulator. The third solenoid valve 20 and the pressure switch 21 are connected to the controller. When the pressure switch detects that the oil pressure in the accumulator is less than the set value, it controls the third solenoid valve to open so that the oil in the accumulator flows back to the oil distribution tank. The oil distribution tank 11 has an outlet corresponding to each hydraulic cylinder. Each outlet of the oil distribution tank and the corresponding hydraulic cylinder inlet are connected through a second return oil pipe 7. A one-way valve is provided on the second return oil pipe 7 to prevent the oil in the hydraulic cylinder 4 from entering the oil distribution tank 11.

[0052] For specific implementation, please refer to Figure 2 and Figure 3 The cleaning water compression chamber 17a and the gas compression chamber 13a corresponding to the water inlet 17c and the air inlet 13c are provided with inlets for the entry of cleaning water or gas and plugs for sealing the inlets. The plugs are inclined on one side of the inlet and are connected to the outside of the inlet. A plug is provided in the plug and can move back and forth in the plug, so as to realize the opening and closing of the inlet during the reciprocating movement of the first piston 17b or the second piston 13b. At least two limiting grooves are provided on the side wall of the compression chamber corresponding to the plug along the length direction of the plug. Correspondingly, a guide block is provided on the plug that corresponds to the limiting groove. The plug guide block is placed on the limiting groove so that the plug can only move back and forth within the limit groove.

[0053] In this way, the cooperation between the limiting groove and the guide block allows the plug to move back and forth within the plug opening while preventing the plug from being sucked into the compression chamber or forced out of the plug opening. This ensures that during the forward movement of the first and second pistons to compress the cleaning water and gas, the plug blocks the corresponding inlets. Conversely, during the backward movement of the first and second pistons, the plug opens the corresponding inlets, drawing the cleaning water and gas into the front chambers of the cleaning water compression chamber and the gas compression chamber, respectively.

[0054] Finally, it should be noted that the above embodiments of the present invention are merely illustrative examples and not intended to limit the implementation of the invention. Those skilled in the art can make other variations and modifications based on the above description. It is impossible to exhaustively list all possible implementations here. All obvious variations or modifications derived from the technical solutions of this invention are still within the scope of protection of this invention.

Claims

1. A car wash wastewater treatment system based on pressure energy, characterized in that, Includes pressure energy unit, filtration unit and aeration unit; The pressure energy unit is used to convert the mechanical energy generated by the vehicle into pressure energy. The filtration unit is used to filter car wash wastewater to remove solids from it. The aeration unit is used to aerate the filtered car wash wastewater to increase the dissolved oxygen content in the wastewater, thereby accelerating the degradation of organic matter in the wastewater; the aeration unit is connected to the pressure energy unit, so that the pressure energy generated by the pressure energy unit can be used to drive the aeration unit to aerate. The pressure energy unit includes an oil tank, an accumulator, and several hydraulic cylinders; All hydraulic cylinders are arranged in at least one row, with corresponding cylinders in each row. A lifting mechanism is provided at the bottom of the cylinders in the same row to control the lifting and lowering of that row. A horizontal support plate is provided on the top of the piston cylinder of the cylinders in the same row. The two ends of the whole formed by all the rows of hydraulic cylinders are the vehicle entrance end and the vehicle exit end, respectively. A weight sensor is provided at the vehicle entrance end to collect vehicle weight data. The weight sensor and all lifting mechanisms are connected to the controller, so that when the vehicle enters from the vehicle entrance end, the controller controls the lifting mechanism to raise and lower each row of hydraulic cylinders according to the received vehicle weight data, so that the vehicle can drive normally and exit from the vehicle exit end while compressing the hydraulic cylinders. All hydraulic cylinder outlets are connected to the oil collection tank inlet via oil collection pipelines, facilitating the delivery of hydraulic fluid from the vehicle's hydraulic cylinders to the oil collection tank for storage. The oil collection tank outlet is connected to the accumulator inlet via oil delivery pipelines, facilitating the delivery of oil from the oil collection tank to the accumulator for compression, converting the oil into high-pressure oil for storage in the accumulator.

2. The car wash wastewater treatment system based on pressure energy according to claim 1, characterized in that, It also includes a wastewater treatment tank with an open top surface. The filtration unit includes a first filter screen, which is set on the top of the wastewater treatment tank to close the top surface of the wastewater treatment tank, so that the car wash wastewater can be filtered when it enters the wastewater treatment tank from the top surface. The bottom of the wastewater treatment tank is provided with a drain outlet for connecting a drain pipe to discharge the water in the wastewater treatment tank.

3. The car wash wastewater treatment system based on pressure energy according to claim 2, characterized in that, It also includes a cleaning unit, which includes a cleaning water compression chamber located on one side of the first filter screen. The cleaning water compression chamber has a water inlet on one side wall. The water inlet of the cleaning water compression chamber is connected to the wastewater treatment tank through a pipeline, so that water in the wastewater treatment tank can enter the cleaning water compression chamber. The front end of the cleaning water compression chamber is provided with a water spray nozzle, and the rear end of the cleaning water compression chamber is connected to the first oil outlet of the accumulator through a first pipeline, and a first solenoid valve is provided on the first pipeline; a first piston is provided in the cleaning water compression chamber, and the first piston divides the cleaning water compression chamber into front and rear chambers. A first spring is provided in the front chamber of the cleaning water compression chamber, and the first spring is horizontally arranged with its two ends connected to the first piston and the corresponding inner wall of the cleaning water compression chamber, respectively.

4. The car wash wastewater treatment system based on pressure energy according to claim 3, characterized in that, A collection box is detachably installed on the side wall of the wastewater treatment tank opposite the cleaning water compression chamber to collect solids washed off the first filter screen.

5. A car wash wastewater treatment system based on pressure energy according to claim 4, characterized in that, The first filter screen has vertical baffles on both sides to ensure that all cleaning water and solids enter the collection tank. At the same time, the bottom of the collection tank has a water outlet, and a second filter screen is installed at the water outlet. The water outlet is connected to the wastewater treatment tank through a return water pipe, which facilitates the return of the cleaning water in the collection tank to the wastewater treatment tank.

6. The car wash wastewater treatment system based on pressure energy according to claim 1, characterized in that, The aeration unit includes a gas compression chamber, which is located on the side wall of the wastewater treatment tank and partially inside the wastewater treatment tank. The front side wall of the gas compression chamber is provided with an air inlet, which is connected to an air inlet pipe. The air inlet pipe is in communication with the outside air to facilitate the entry of gas into the gas compression chamber. The front end of the gas compression chamber is provided with several jet nozzles, and the rear end of the gas compression chamber is connected to the second oil outlet of the accumulator through a second pipeline. A second solenoid valve is provided on the second pipeline. A second piston is provided in the gas compression chamber, which divides the gas compression chamber into front and rear chambers. A second spring is provided in the front chamber of the gas compression chamber. The second spring is horizontally arranged and its two ends are respectively connected to the second piston and the corresponding inner wall of the gas compression chamber.

7. The car wash wastewater treatment system based on pressure energy according to claim 1, characterized in that, A check valve is installed on the oil collection line to prevent oil in the oil collection tank from flowing back into the hydraulic cylinder.

8. The car wash wastewater treatment system based on pressure energy according to claim 1, characterized in that, It also includes an oil distribution tank. The return port of the accumulator and the inlet of the oil distribution tank are connected through a first return oil pipeline. A third solenoid valve and a pressure switch are installed on the first return oil pipeline. The pressure switch is located near the return port of the accumulator and is used to detect the oil pressure in the accumulator. The third solenoid valve and the pressure switch are connected to the controller. When the pressure switch detects that the oil pressure in the accumulator is less than a set value, it controls the third solenoid valve to open so that the oil in the accumulator flows back to the oil distribution tank. The oil distribution tank has an outlet that corresponds to each hydraulic cylinder. Each outlet of the oil distribution tank and the corresponding inlet of the hydraulic cylinder are connected through a second return oil pipeline. A check valve is installed on the second return oil pipeline to prevent the oil in the hydraulic cylinder from entering the oil distribution tank.

9. A car wash wastewater treatment system based on pressure energy according to claim 3 or 6, characterized in that, The side walls of the cleaning water compression chamber and the gas compression chamber corresponding to the water inlet and air inlet are provided with inlets for the entry of cleaning water or gas and plugs for sealing the inlets. The plugs are inclinedly arranged on one side of the inlet and are connected to the outside of the inlet. A plug is provided in the plug, which can reciprocate within the plug to facilitate the opening and closing of the inlet during the reciprocating movement of the first piston or the second piston. At least two limiting grooves are provided on the side wall of the compression chamber corresponding to the plug along the length of the plug. Correspondingly, guide blocks are provided on the plug that correspond one-to-one with the limiting grooves. The plug guide blocks are placed on the limiting grooves so that the plug can only reciprocate within the range of the limiting grooves.

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