Car washing nozzle and car washing pipeline system with cleaning liquid and high pressure water

Abstract

A kind of cleaning fluid and high-pressure water two-in-one car washing nozzle and its car washing pipeline system, the nozzle includes high-low pressure dual-purpose channel for high-pressure water spraying, and low-pressure channel mainly for spraying cleaning fluid foam, the one-way valve in low-pressure channel is automatically closed after high-pressure water source is connected, only high-low pressure dual-purpose channel is left to spray water outward;The one-way valve in low-pressure channel opens after low-pressure cleaning fluid foam is connected, at this time high-low pressure dual-purpose channel and low-pressure channel are both used to spray cleaning fluid foam, the car washing pipeline system, through foaming pipe section, low-pressure pipeline system and high-pressure water pipe system are connected respectively, low-pressure pipeline system is used to supply mixed cleaning fluid, and different pipeline switches are used for control, connect the two-in-one car washing nozzle described above, high-pressure water and cleaning fluid foam can be perfectly realized in one nozzle spraying, reduce operation difficulty, especially suitable for self-service car washer.

Description

Technical Field

[0001] This utility model relates to the technical field of car washing, and in particular to a two-in-one car wash nozzle that combines cleaning fluid and high-pressure water, and its car wash piping system. Background Technology

[0002] The main tools used in existing car wash machines are high-pressure water guns and cleaning fluid spray guns. High-pressure water guns are used to wet the car and provide powerful cleaning, while cleaning fluid spray guns are used to spray cleaning fluid foam for stain removal. The typical process involves first wetting the car with the high-pressure water gun, then applying cleaning fluid to the car body using the cleaning fluid spray gun. After a short soaking time to remove dirt, a person using a cloth wipes the car to remove the dirt adhering to the surface. Finally, the high-pressure water gun is used to rinse off the cleaning fluid foam to achieve a clean car. However, this cleaning method requires the alternating use of two spray guns, necessitating running around to switch them. Especially with the increasingly popular unattended automatic car wash machines, customers need to wash their cars themselves. Non-professional car wash workers have to switch spray guns repeatedly and confirm the functions of both, which affects washing efficiency and wastes time. This can lead to a loss for self-service car wash machines when there are long queues, making improvements and upgrades necessary. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems by providing a two-in-one car wash nozzle for cleaning fluid and high-pressure water, and its car wash pipeline system. This nozzle can achieve both high-pressure water spraying and low-pressure spraying of cleaning fluid foam through a single nozzle, automatically switching according to the pressure, making it convenient to use.

[0004] A two-in-one car wash nozzle combining cleaning fluid and high-pressure water includes a nozzle housing as the main body, and a high-low pressure dual-purpose channel and a low-pressure channel inside the nozzle housing. The nozzle is characterized in that: the rear part of the housing is a liquid receiving cavity, and an interface for connecting to a car wash pipe is provided at the outer end of the liquid receiving cavity; the inner end face of the liquid receiving cavity has two holes that communicate with the high-low pressure dual-purpose channel and the low-pressure channel respectively; the high-low pressure dual-purpose channel passes forward through the housing and forms a high-low pressure dual-purpose nozzle at the front end of the housing; the low-pressure channel passes forward through the housing and forms a low-pressure nozzle at the front end of the housing; and a forward-closing high-pressure one-way valve is provided in the portion of the low-pressure channel near the liquid receiving cavity.

[0005] In use: After connecting to the car wash hose, the car wash hose can supply flushing water under high pressure or supply cleaning solution foam under low pressure. The opening and closing pressure of the one-way valve is between the high pressure and low pressure mentioned above.

[0006] When the high-pressure water source is connected, the one-way valve inside the low-pressure channel automatically closes, leaving only the dual-purpose high- and low-pressure channel spraying water for high-pressure rinsing. When the low-pressure cleaning foam is connected, its one-way valve opens, and both the dual-purpose high- and low-pressure channels are used to spray the cleaning foam. At this time, the dual-purpose high- and low-pressure channel can also spray the cleaning foam, increasing the spray volume and coverage, improving spray efficiency, and shortening spray time.

[0007] This nozzle can be used as a high-pressure water rinsing nozzle or a cleaning fluid foam spray nozzle. When used in the cleaning industry, it can be connected to a two-in-one supply line. During use, it will automatically switch according to the pressure in the supply line without manual switching.

[0008] Preferably, the high-pressure one-way valve includes a spring, a valve ball, a sealing ring, and a pressure cap. The low-pressure channel, near the liquid receiving chamber, has two stepped surfaces of different sizes with corresponding stepped holes of different sizes. The sealing ring is fixed to the larger stepped surface, and the lower end of the spring is supported on the smaller stepped surface. The upper end of the spring passes through the inner hole of the sealing ring and presses the valve ball against the lower surface of the pressure cap. The pressure cap is fixed to the liquid receiving chamber by screws and has a water passage hole A communicating with the low-pressure channel. When the connected car wash pipe supplies high-pressure washing water, the high-pressure water acts on the valve ball, compressing the spring and pressing it against the central hole of the sealing ring, thus closing the one-way valve. In this way, high-pressure water can only be sprayed from the dual-purpose high and low pressure channel, forming a high-pressure water flow for washing the car. When low-pressure cleaning fluid foam is connected, the pressure generated on the valve ball is insufficient to overcome the spring force. The spring lifts the valve ball to the positioning hole on the pressure plate, opening the one-way valve.

[0009] Preferably, the pressure cap is provided with a circular positioning hole at the position corresponding to the valve ball. The diameter of the positioning hole is smaller than the diameter of the valve ball, and several fan-shaped water passage holes are evenly distributed around the positioning hole.

[0010] Preferably, the size and shape of the pressure cap match the size and shape of the inner end face of the liquid containing cavity. The pressure cap is also provided with a water passage hole B corresponding to the high and low pressure dual-purpose channel. The pressure cap is fixed to the inner end face of the liquid containing cavity by screws.

[0011] Preferably, the flow diameter of the high- and low-pressure dual-purpose channel is d1, and the flow diameter of the low-pressure channel is d2, where d1 < d2.

[0012] Preferably, the low-pressure nozzle is a fan-shaped nozzle.

[0013] A car wash piping system based on the aforementioned two-in-one car wash nozzle is characterized by:

[0014] The car wash piping system includes the two-in-one car wash nozzle and a foaming tube section connected to the nozzle. Upstream of the foaming tube section, a T-junction (A) connects to both a high-pressure piping system and a low-pressure piping system. The high-pressure piping system includes a high-pressure pipe and a high-pressure water source connected via a one-way valve. The low-pressure piping system includes a gas-liquid mixing pipe connected to T-junction (A) via a one-way valve. Upstream of the gas-liquid mixing pipe, a T-junction (B) connects to both a liquid-water mixing pipe and a pressurized air pipe. The pressurized air pipe is connected to a pressurized air source via a one-way valve, and the liquid-water mixing pipe is connected to T-junction (C) via a one-way valve. Upstream of T-junction (C) are a cleaning fluid pipe and a low-pressure water pipe. The cleaning fluid pipe is connected to a cleaning fluid water source via a one-way valve, and the low-pressure water pipe is connected to a low-pressure water source via a one-way valve. Both the low-pressure water pipe and the cleaning fluid pipe are equipped with concentration adjustment valves. This car wash piping system, with the foaming tube section connecting to both the low-pressure and high-pressure water piping systems, supplies the mixed cleaning fluid, while the high-pressure water piping system supplies high-pressure cleaning water. By controlling different pipeline switches and connecting to the aforementioned two-in-one car wash nozzle, it perfectly achieves the sharing of high-pressure water and cleaning solution foam spray from a single nozzle, significantly reducing the difficulty of operation during car washing, and is especially suitable for use on self-service car wash machines. In use, the operator only needs to switch the switch to control the spraying of high-pressure water or car wash foam; there is no need to change the spray gun.

[0015] Preferably, the pressure air pipe is equipped with a pressure regulating valve between the one-way valve and the pressure air source, and a safety valve is connected to the gas-liquid mixing pipe.

[0016] Preferably, a pressure switch B is provided between the check valve of the high-pressure pipe and the high-pressure water source, and a pressure switch A is provided between the check valve of the liquid-water mixing pipe and the three-way valve C.

[0017] Preferably, the foamed pipe section is connected to an antifreeze filling bypass near the T-junction, or an antifreeze filling bypass is connected to the pressurized air pipe, or an antifreeze filling bypass is connected to the gas-liquid mixing pipe, for pipeline antifreeze after low-temperature venting.

[0018] This car wash nozzle, which combines cleaning fluid and high-pressure water, along with its piping system, includes a high- and low-pressure dual-purpose channel for high-pressure water spraying and a low-pressure channel primarily for spraying cleaning fluid foam. When the high-pressure water source is connected, the one-way valve inside the low-pressure channel automatically closes, allowing only the high- and low-pressure dual-purpose channel to spray water. When the low-pressure cleaning fluid foam is connected, its one-way valve opens, allowing both the high- and low-pressure dual-purpose channel and the low-pressure channel to spray the cleaning fluid foam. The piping system connects to the low-pressure system and the high-pressure water system via foaming pipes. The low-pressure system supplies the mixed cleaning fluid, and different pipe switches control the system. Connecting to the aforementioned two-in-one car wash nozzle allows for perfect spraying of both high-pressure water and cleaning fluid foam from a single nozzle, reducing operational difficulty and making it particularly suitable for use in self-service car wash machines. Attached Figure Description

[0019] Figure 1 A front cross-sectional view of the structure of a car wash nozzle that combines cleaning fluid and high-pressure water.

[0020] Figure 2 A three-dimensional structural diagram of a car wash nozzle that combines cleaning fluid and high-pressure water;

[0021] Figure 3 This is one of the three-dimensional structural diagrams of the nozzle housing;

[0022] Figure 4 This is the second schematic diagram of the three-dimensional structure of the nozzle housing;

[0023] Figure 5 This is the second schematic diagram of the three-dimensional structure of the pressure plate;

[0024] Figure 6 This is one of the schematic diagrams of a car wash piping system;

[0025] Figure 7 This is the second schematic diagram of a car wash piping system.

[0026] Figure 1-5 In the middle: 1. Nozzle housing, 2. High and low pressure dual-purpose channel, 3. Low pressure channel, 31. Large step surface, 32. Small step surface, 4. Liquid receiving cavity, 5. Interface of liquid receiving cavity, 6. Hole, 7. High and low pressure dual-purpose nozzle, 8. Low pressure nozzle, 9. High pressure one-way valve, 92. Spring, 91. Valve ball, 93. Sealing ring, 10. Pressure cap, 101. Water passage hole A, 102. Circular positioning hole, 103. Water passage hole B, 104. Screw through hole, 11. Screw, 12. Inner end face of liquid receiving cavity, 13. Threaded hole. Detailed Implementation

[0027] Example 1: See Figure 1-5A two-in-one car wash nozzle combining cleaning fluid and high-pressure water includes a nozzle housing as the main body, and a high-low pressure dual-purpose channel and a low-pressure channel inside the nozzle housing. The nozzle is characterized in that: the rear part of the housing is a liquid receiving cavity, and an interface for connecting to a car wash pipe is provided at the outer end of the liquid receiving cavity; the inner end face of the liquid receiving cavity has two holes that communicate with the high-low pressure dual-purpose channel and the low-pressure channel respectively; the high-low pressure dual-purpose channel passes forward through the housing and forms a high-low pressure dual-purpose nozzle at the front end of the housing; the low-pressure channel passes forward through the housing and forms a low-pressure nozzle at the front end of the housing; and a forward-closing high-pressure one-way valve is provided in the portion of the low-pressure channel near the liquid receiving cavity.

[0028] In use: After connecting to the car wash hose, the car wash hose can supply flushing water under high pressure or supply cleaning solution foam under low pressure. The opening and closing pressure of the one-way valve is between the high pressure and low pressure mentioned above.

[0029] When the high-pressure water source is connected, the one-way valve inside the low-pressure channel automatically closes, leaving only the dual-purpose high- and low-pressure channel spraying water for high-pressure rinsing. When the low-pressure cleaning foam is connected, its one-way valve opens, and both the dual-purpose high- and low-pressure channels are used to spray the cleaning foam. At this time, the dual-purpose high- and low-pressure channel can also spray the cleaning foam, increasing the spray volume and coverage, improving spray efficiency, and shortening spray time.

[0030] This nozzle can be used as a high-pressure water rinsing nozzle or a cleaning fluid foam spray nozzle. When used in the cleaning industry, it can be connected to a two-in-one supply line. During use, it will automatically switch according to the pressure in the supply line without manual switching.

[0031] Example 2: See Figure 1-5 Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that the structure of Example 2 is more detailed. The high-pressure one-way valve in Example 2 includes a spring, a valve ball, a sealing ring, and a pressure cap. The low-pressure channel near the liquid-containing cavity has two stepped surfaces of different sizes, with corresponding stepped holes of different sizes. The sealing ring is fixed to the larger stepped surface, and the lower end of the spring is supported on the smaller stepped surface. The upper end of the spring passes through the inner hole of the sealing ring and pushes the valve ball against the lower surface of the pressure cap. The pressure cap is fixed to the liquid-containing cavity by screws. The pressure cap has a water passage hole A communicating with the low-pressure channel. A circular positioning hole, smaller in diameter than the valve ball, is provided on the pressure cap at a position corresponding to the valve ball. Several fan-shaped water passage holes A are evenly distributed around the positioning hole. The size and shape of the pressure cap match the size and shape of the inner end face of the liquid-containing cavity. The pressure cap also has a water passage hole B corresponding to the high and low pressure dual-purpose channel. The pressure cap is fixed to the inner end face of the liquid-containing cavity by screws.

[0032] When the connected car wash pipe supplies high-pressure flushing water, the high-pressure water acts on the valve ball. After being pressed, the valve ball compresses the spring and squeezes against the central hole of the sealing ring, thus closing the one-way valve. In this way, the high-pressure water can only be sprayed out from the high- and low-pressure dual-purpose channel, forming a high-pressure water flow for cleaning the car. When the low-pressure cleaning fluid foam is connected, the pressure generated on the valve ball is insufficient to overcome the spring force. The spring lifts the valve ball to the positioning hole on the pressure plate, and the one-way valve opens. At this time, the cleaning fluid foam is sprayed outwards simultaneously through both channels, resulting in a larger spray area and a larger coverage area, enabling efficient and rapid coverage of the car surface by the foam.

[0033] The flow diameter of the high-low pressure dual-purpose channel is d1, and the flow diameter of the low-pressure channel is d2, where d1 < d2. This means that when switching to high-pressure flushing water in the car wash pipe, the water outlet channel narrows rapidly, causing the internal pressure to rise quickly. This improves the closing speed and effectiveness of the one-way valve. When using the high-low pressure dual-purpose channel alone for rinsing, the high-pressure water is sprayed out with more force, resulting in a better rinsing effect.

[0034] The low-pressure channel diameter d2 is much larger than the high-low pressure dual-purpose channel diameter d1. When the low-pressure channel is open to spray foam, the nozzle outlet pressure decreases, which facilitates the mixing of gas and foam liquid, resulting in excellent foaming effect. The low-pressure nozzle is a fan-shaped nozzle, which also allows for a larger coverage area of ​​the sprayed cleaning fluid foam. Combined with the assistance of the high-low pressure dual-purpose nozzle, the overall spray coverage area is larger, enabling faster foam spraying and improving work efficiency. The interface at the outer end of the liquid receiving chamber is a threaded connection interface, facilitating connection to pipelines supplying cleaning water and cleaning fluid foam.

[0035] Example 3: See Figure 1-6 The figure shows a car wash piping system, which includes a two-in-one car wash nozzle as described in Embodiment 1 or 2, and a foaming tube section connected to the nozzle. Figure 6 As shown by the purple line in the middle, the high-pressure pipeline system and the low-pressure pipeline system are connected respectively via a tee joint upstream of the foaming pipe section. The high-pressure pipeline system includes a high-pressure pipe ( Figure 6 (As shown by the red line in the middle) and the high-pressure water source connected to it via a one-way valve, specifically a high-pressure water pump or a matching high-pressure water supply.

[0036] The low-pressure pipeline system includes a gas-liquid mixing pipe connected to a three-way valve via a one-way valve. Figure 6 (As shown by the green line in the middle), upstream of the gas-liquid mixing pipe, a liquid-water mixing pipe is connected via a tee (B) respectively. Figure 6 (shown by the blue line) and compressed air tube ( Figure 6(As shown by the white line in the middle); the liquid-water mixing pipe is connected to the three-way connector C via a one-way valve. The upstream of the three-way connector C is connected to the cleaning liquid pipe and the low-pressure water pipe, respectively. The cleaning liquid pipe is connected to the cleaning liquid water source via a one-way valve, and the low-pressure water pipe is connected to the low-pressure water source via a one-way valve. The low-pressure water pipe and the cleaning liquid pipe are equipped with concentration ratio regulating valves. These regulating valves are two-way linkage regulating valves. When the amount of cleaning liquid is increased, the amount of water used is reduced simultaneously, so that the ratio adjustment is faster. Of course, two unrelated valves can also be set up and adjusted separately to achieve the ratio adjustment.

[0037] The pressure air pipe is equipped with a pressure regulating valve between the one-way valve and the pressure air source. The pressure regulating valve is used to adjust the pressure of the incoming air, thereby controlling the foaming effect. After the gas-liquid mixing pipe is used, the mixture is then fully mixed and foamed in the foaming pipe section. A large amount of foam is sprayed out from the low-pressure channel and the high-low pressure channel of the nozzle at the same time.

[0038] A safety valve is connected to the gas-liquid mixing pipe to protect the low-pressure pipeline system in case the check valve at this location malfunctions. Pressure switch B is installed between the check valve on the high-pressure pipe and the high-pressure water source, and pressure switch A is installed between the check valve on the liquid-water mixing pipe and the tee C. Pressure switches B and A are used to control the flow of liquid in the two pipes, with one of them opening selectively.

[0039] This car wash piping system connects to a low-pressure piping system and a high-pressure water piping system via foaming pipe sections. The low-pressure piping system supplies the mixed cleaning solution, while the high-pressure water piping system supplies high-pressure cleaning water. Controlled by different pipe switches, it connects to the two-in-one car wash nozzle described in Example 1, perfectly enabling the sharing of high-pressure water and cleaning solution foam from a single nozzle. This significantly reduces the difficulty of operation during car washing, making it particularly suitable for use in self-service car wash machines. During use, the operator only needs to switch switches to control the spraying of high-pressure water or car wash foam; there is no need to change the spray gun.

[0040] In addition, the above-mentioned piping system can be arranged closer to the main unit of the self-service car wash machine. The relevant T-junction is placed inside the main unit housing. The foaming pipe section is led out from the main unit and there is a total of one foaming pipe section to the two-in-one nozzle held by the operator (this foaming pipe section is only defined as a foaming pipe section and performs different piping functions in different working states). This makes the overall structure more compact.

[0041] During high-pressure water cleaning: Pressure switch A is closed. Figure 6 The check valve on the pipe indicated by the blue and green lines is closed, pressure switch B is open, and high-pressure water supplied by the high-pressure water source flows along... Figure 6 The high-pressure pipe, indicated by the red line, passes through a tee and then through... Figure 6The purple foaming tube section in the middle reaches the two-in-one car wash nozzle. The pressure of the high-pressure water seals the one-way valve inside the nozzle, and the high-pressure water is sprayed out through the high and low pressure channels and its nozzles, providing powerful cleaning water to achieve the rinsing effect.

[0042] When the cleaning fluid foam is sprayed: pressure switch B is closed. Figure 6 The one-way valve on the high-pressure pipe (shown by the red line) is closed, and pressure switch A is open. The cleaning fluid and water supplied by the cleaning fluid pipe and the low-pressure water pipe flow together through T-junction C into the liquid-water mixing pipe to form a diluted cleaning fluid. The diluted cleaning fluid and air then flow through T-junction B into the vapor-liquid mixing pipe, and then through T-junction A into the foaming section. In the vapor-liquid mixing pipe and the foaming section, the mixing of air and cleaning fluid generates foam, achieving the foaming effect. The foamed cleaning fluid finally reaches the two-in-one car wash nozzle. Because the pressure of the cleaning fluid foam is low, it cannot close the one-way valve inside the nozzle. At this point, the cleaning fluid foam simultaneously passes through the high-pressure and low-pressure channels and its nozzle, spraying the foam over a large area to cover the vehicle being cleaned.

[0043] Post-shutdown drainage and antifreeze measures: After cleaning, both pressure switches A and B are closed. Air can be used to dry the vapor-liquid mixing pipe and foaming pipe section, primarily to blow out any residual liquid inside the foaming pipe section located outside the main unit until it is completely dry. This reduces the possibility of ice formation inside the foaming pipe section at low temperatures, ensuring it will not affect future use. At this time, the high-pressure and low-pressure channels in the two-in-one nozzle are used for drainage simultaneously. The high-speed, smooth airflow within the pipes results in better drainage and minimizes the possibility of liquid residue in the vapor-liquid mixing pipe.

[0044] Example 4: See Figure 7 Example 4 is basically the same as Example 3, and the similarities will not be repeated. The difference is that in Example 4, the foaming pipe section is connected to an antifreeze filling bypass pipe near the T-junction. Figure 6 As shown by the yellow line in the middle. After the air purging and drainage are completed, add an appropriate amount of antifreeze through this bypass. A small amount of antifreeze is blown out of the nozzle by the airflow. At this time, the small amount of water remaining in the pipe mixes with the antifreeze, and it will not freeze at low temperatures, thus completely achieving antifreeze protection for the foamed pipe section located outside the main unit.

[0045] Of course, the antifreeze filling bypass in the above embodiment four can also be replaced by setting it on the pressure air pipe or on the gas-liquid mixing pipe.

Claims

1. A two-in-one car wash nozzle combining cleaning fluid and high-pressure water, comprising a nozzle housing as the main body, and a high-low pressure dual-purpose channel and a low-pressure channel inside the nozzle housing, characterized in that: The rear part of the housing is a liquid-containing cavity. An interface for connecting to a car wash pipe is provided at the outer end of the liquid-containing cavity. The inner end face of the liquid-containing cavity is provided with two holes that are respectively connected to a high-low pressure dual-purpose channel and a low-pressure channel. The high-low pressure dual-purpose channel passes forward through the housing and is a high-low pressure dual-purpose nozzle at the front end of the housing. The low-pressure channel passes forward through the housing and is a low-pressure nozzle at the front end of the housing. A high-pressure one-way valve that closes forward is provided in the part of the low-pressure channel near the liquid-containing cavity.

2. The car wash nozzle combining cleaning fluid and high-pressure water according to claim 1, characterized in that: The high-pressure one-way valve includes a spring, a valve ball, a sealing ring, and a pressure cap. The low-pressure channel has two stepped surfaces of different sizes near the liquid receiving cavity, with corresponding stepped holes of different sizes. The sealing ring is fixed on the larger stepped surface, and the lower end of the spring is supported on the smaller stepped surface. The upper end of the spring passes through the inner hole of the sealing ring and pushes the valve ball against the lower surface of the pressure cap. The pressure cap is fixed in the liquid receiving cavity by screws, and the pressure cap has a water passage hole A that communicates with the low-pressure channel.

3. The car wash nozzle combining cleaning fluid and high-pressure water according to claim 2, characterized in that: The pressure cap is provided with a circular positioning hole at the position corresponding to the valve ball. The diameter of the positioning hole is smaller than the diameter of the valve ball, and several fan-shaped water passage holes are evenly distributed around the positioning hole.

4. The car wash nozzle combining cleaning fluid and high-pressure water according to claim 2, characterized in that: The size and shape of the pressure cap match the size and shape of the inner end face of the liquid containing cavity. The pressure cap is also provided with a water passage hole B corresponding to the high and low pressure dual-purpose channel. The pressure cap is fixed to the inner end face of the liquid containing cavity by screws.

5. The car wash nozzle combining cleaning fluid and high-pressure water according to claim 1, characterized in that: The flow diameter of the high- and low-pressure dual-purpose channel is d1, and the flow diameter of the low-pressure channel is d2, where d1 < d2.

6. The car wash nozzle combining cleaning fluid and high-pressure water according to claim 1, characterized in that: The low-pressure nozzle is a fan-shaped nozzle.

7. A car wash piping system comprising a two-in-one car wash nozzle according to any one of claims 1-6, characterized in that: The car wash piping system includes the two-in-one car wash nozzle and a foaming pipe section connected to the nozzle. Upstream of the foaming pipe section, a T-junction A connects to both a high-pressure piping system and a low-pressure piping system. The high-pressure piping system includes a high-pressure pipe and a high-pressure water source connected to it via a one-way valve. The low-pressure piping system includes a gas-liquid mixing pipe connected to T-junction A via a one-way valve. Upstream of the gas-liquid mixing pipe, a liquid-water mixing pipe and a pressurized air pipe are connected via T-junction B. The pressurized air pipe is connected to a pressurized air source via a one-way valve, and the liquid-water mixing pipe is connected to T-junction C via a one-way valve. Upstream of T-junction C, a cleaning fluid pipe and a low-pressure water pipe are connected. The cleaning fluid pipe is connected to a cleaning fluid water source via a one-way valve, and the low-pressure water pipe is connected to a low-pressure water source via a one-way valve. Concentration adjustment valves are installed on both the low-pressure water pipe and the cleaning fluid pipe.

8. The car wash piping system according to claim 7, characterized in that: The pressure air pipe is equipped with a pressure regulating valve between the check valve and the pressure air source, and a safety valve is connected to the gas-liquid mixing pipe.

9. The car wash piping system according to claim 7, characterized in that: Pressure switch B is installed between the check valve of the high-pressure pipe and the high-pressure water source, and pressure switch A is installed between the check valve of the liquid-water mixing pipe and the three-way valve C.

10. The car wash piping system according to claim 7, characterized in that: The foaming pipe section is connected to an antifreeze filling bypass near the T-junction, or an antifreeze filling bypass is connected to the pressurized air pipe, or an antifreeze filling bypass is connected to the gas-liquid mixing pipe.

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