Pressure holding valve of high pressure cleaner

Abstract

This utility model provides a pressure-holding valve for a high-pressure washer, which solves the problem of excessive width in existing pressure-holding valves. The pressure-holding valve includes a valve body with an adjusting hole, an inlet channel, and an outlet channel formed within it. A drain outlet is located at the rear of the inlet channel. An adjusting rod slides vertically within the adjusting hole, and an annular seat is located in the middle of the adjusting rod, sealing against the inner wall of the adjusting hole. A closed cavity is formed between the lower side of the annular seat and the inner wall of the adjusting hole, and this closed cavity connects to the outlet channel through a guide hole formed within the valve body. A sealing head is located at the upper end of the adjusting rod, and a water guide cylinder is located at the upper end of the adjusting hole. A high-pressure chamber is formed between the upper side of the annular seat and the water guide cylinder, and this high-pressure chamber connects to the inlet channel through the inner hole of the water guide cylinder. The left end of the left water hole connects to the high-pressure chamber, and an inlet is located on the rear wall of the high-pressure chamber. The sealing head is located inside the water guide cylinder, and a spring is provided within the high-pressure chamber to cause the adjusting rod to move downwards and to cause the sealing head to cut off the inner hole of the water guide cylinder. This pressure-holding valve for a high-pressure washer has a small width.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a high-pressure cleaner, and more particularly to a pressure holding valve for a high-pressure cleaner. Background Technology

[0002] A high-pressure washer is a device that uses a power unit to drive a high-pressure plunger to generate high-pressure water to rinse the surface of an object.

[0003] The pressure holding valve is an important component of a high-pressure washer. Its structure is as disclosed in the Chinese Patent Database for a low-pressure holding switch valve used in a washer (application number: 202120689763.7). It includes a pump head with an inlet and an outlet, a pressure regulating and unloading valve, a switch valve, a micro switch, and a check valve. The pump head has an inlet chamber, a pump chamber, and an outlet chamber. The check valve is located at the outlet. A pressure relief channel is also opened between the inlet chamber and the pump chamber, and a pressure regulating and unloading valve is installed at the pressure relief channel. The switch valve includes a switch valve chamber, in which a switch valve rod and a switch valve spring are movably installed. One end of the switch valve chamber is connected to the pump chamber, and the other end is connected to the outlet chamber through a secondary pressure relief channel. The pump chamber and the outlet chamber are separated by a secondary pressure relief rod and a pressure relief sealing ring.

[0004] In the aforementioned switching valve, the components that provide pressure relief and pressure holding functions are roughly arranged in a T-shape, which increases the thickness of the switching valve and thus lengthens the overall length of the cleaning machine, resulting in a large space occupation. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a compact pressure-holding valve for high-pressure cleaners.

[0006] The objective of this utility model can be achieved through the following technical solution: a pressure-holding valve for a high-pressure washer, comprising a valve body, wherein a vertically arranged adjusting hole and horizontally arranged inlet and outlet water channels are formed within the valve body. A drain outlet is provided on the rear side of the inlet water channel. An adjusting rod is vertically slidably arranged within the adjusting hole, with the lower end of the adjusting rod extending out of the adjusting hole. The outlet water channel consists of a connected left water hole and a right water hole. A one-way component is provided within the right water hole, which acts on the right end of the left water hole to ensure unidirectional flow of the outlet water channel from left to right. The feature is that an annular seat is provided on the outer wall of the middle portion of the adjusting rod, and the annular... The outer wall of the annular seat is in contact with the inner wall of the regulating hole for sealing; a closed cavity is formed between the lower side of the annular seat and the inner wall of the regulating hole, and the closed cavity is connected to the right water hole through a guide hole formed in the valve body; the upper end of the regulating rod is a sealing head, the upper end of the regulating hole has a water guide cylinder, a high-pressure cavity is formed between the upper side of the annular seat and the water guide cylinder, and the high-pressure cavity is connected to the water inlet channel through the inner hole of the water guide cylinder, the left end of the left water hole is connected to the high-pressure cavity, and a water inlet is opened on the rear side wall of the high-pressure cavity; the sealing head is located inside the water guide cylinder, and a spring is provided in the high-pressure cavity to make the regulating rod move downward and make the sealing head cut off the inner hole of the water guide cylinder.

[0007] In the actual product, the cleaning machine includes a plunger pump and a micro switch. The plunger pump includes a pump head and a motor, and the pressure holding valve is fixed to the front of the pump head. The micro switch is used to control the motor's start and stop. Under the action of a spring, the lower end of the adjusting rod presses against the contact of the micro switch. The aforementioned drain port and inlet port are respectively connected to the inlet chamber and outlet chamber of the pump head.

[0008] In use, the water gun is connected to the right end of the outlet channel. Water enters through the inlet channel. Due to the spring action of the sealing head on the adjusting rod cutting off the inner hole of the guide tube, the water can only flow into the plunger pump head for pressurization. The pressurized water flows out through the outlet chamber of the plunger pump to the high-pressure chamber, then flows into the outlet channel and is discharged through the water gun. When the water gun is turned off, the high-pressure water at the outlet channel will backflow due to the plunger pump motor still running. Limited by the one-way component, the high-pressure water will enter the closed chamber through the guide hole, forcing the adjusting rod to overcome the spring force and move upward to open the inner hole of the guide tube. At this time, the adjusting rod moves away from the micro switch contact to turn off the motor. The high-pressure chamber and the inlet channel are connected, releasing the high pressure at the high-pressure chamber and the plunger pump head. After the high pressure is released, the adjusting rod moves down to reset under the action of the spring and cuts off the inner hole of the guide tube again, entering the low-pressure holding state.

[0009] The components for high-pressure release and low-pressure holding are integrated into the adjustment hole, which greatly shortens the distance between the components. At the same time, the adjustment hole is set vertically, which can effectively shorten the width of the valve body, making the structure of the plunger pump and valve body of the cleaning machine more compact, reducing the overall length of the cleaning machine and reducing space occupation.

[0010] In the pressure-holding valve of the high-pressure washer described above, the regulating hole is located below the water inlet channel, with its upper end extending to the inner wall of the water inlet channel. A water guide tube is fixed inside the regulating hole, forming a seal between the outer wall of the water guide tube and the inner wall of the regulating hole, and the upper end of the water guide tube extends into the water inlet channel. This design shortens the distance between the water inlet channel and the regulating hole, making the valve body structure more compact.

[0011] In the pressure-holding valve of the high-pressure washer described above, a spring is sleeved outside the adjusting rod, with both ends of the spring acting on the annular seat and the water guide cylinder, respectively. The adjusting rod consists of an upper rod and a lower rod that are coaxially arranged and fixedly connected. The upper end of the upper rod is the aforementioned sealing head, and the annular seat is mounted on the lower rod, with the lower end of the lower rod extending out of the adjusting hole. Sleeving the spring outside the adjusting rod can reduce the diameter of the adjusting hole, making the structure of the washer more compact.

[0012] In the pressure holding valve of the high-pressure cleaner mentioned above, a threaded hole is axially opened on the top surface of the lower rod, and an external threaded post matching the threaded hole is vertically formed on the bottom surface of the upper rod. The external threaded post is threaded into the threaded hole to facilitate adjustment of the length of the adjusting rod to adjust the spring compression amount, which is beneficial for debugging.

[0013] In the aforementioned pressure-holding valve for a high-pressure washer, the valve body consists of a connector and a main body that are integrated into one unit. The main body has a vertical straight hole for accommodating the adjusting rod and the water guide tube. The upper end of the connector is fixed inside the lower end of the straight hole, and the inner hole of the connector and the straight hole together form the aforementioned adjusting hole. The outer wall of the water guide tube and the upper inner wall of the adjusting hole are tightly fitted and fixed together. The inner wall of the connector forms a seal with the outer wall of the adjusting rod through an oil seal, and the lower side of the annular seat, the adjusting rod, the oil seal, and the connector together form the aforementioned closed cavity. During assembly, the adjusting rod, the water guide tube, and the spring are first assembled into a whole, then the whole assembly is pressed into the straight hole, and finally the connector is installed. Assembly is relatively convenient.

[0014] In the pressure-holding valve of the aforementioned high-pressure washer, a retaining ring is coaxially fixed inside the connector. The retaining ring is fitted over the adjusting rod with a clearance fit, and is positioned directly above the oil seal. The retaining ring above the oil seal prevents most of the high-pressure water flowing into the closed cavity from impacting the oil seal, thus extending its lifespan.

[0015] In the pressure-holding valve of the high-pressure washer described above, the sealing head has a conical surface (I) whose diameter gradually decreases from top to bottom. A second conical surface (II) matching the first conical surface is formed on the inner wall of the water guide cylinder. Under the action of a spring, the first conical surface can press against the second conical surface to form a seal. The cooperation of the first and second conical surfaces not only stably cuts off the inner hole of the water guide cylinder but also uses the taper to correct the position of the adjusting rod, thereby improving the sliding accuracy of the adjusting rod and ensuring stable operation of the washer.

[0016] In the pressure-holding valve of the high-pressure washer described above, the guide hole is a straight hole, which is inclined and connected to the right water hole and the closed cavity at both ends. This design reduces the amount of material used in the valve body and makes the valve body more compact.

[0017] In the pressure holding valve of the high-pressure cleaner mentioned above, an annular groove coaxial with the water guide cylinder is provided on the outer wall of the water guide cylinder. A sealing ring is provided in the annular groove, and the outer side of the sealing ring contacts and seals the inner wall of the adjustment hole.

[0018] In the pressure holding valve of the high-pressure cleaner mentioned above, an annular groove 2, coaxial with the adjusting rod, is provided on the outer wall of the annular seat. A sealing ring 2 is provided in the annular groove 2, and the outer side of the sealing ring 2 contacts and seals with the inner wall of the adjusting hole.

[0019] Compared with existing technologies, the pressure holding valve of this high-pressure washer integrates the components for high-pressure release and low-pressure holding into the adjustment hole, which greatly shortens the distance between the components. At the same time, the adjustment hole is set to be vertical, which can effectively shorten the width of the valve body, making the structure of the washer plunger pump and valve body more compact, reducing the overall length of the washer and reducing space occupation. Attached Figure Description

[0020] Figure 1 This is a 3D schematic diagram of the pressure holding valve of a high-pressure washer.

[0021] Figure 2 This is a schematic diagram of the installation of the pressure holding valve of a high-pressure washer.

[0022] Figure 3 This is a cross-sectional schematic diagram of the pressure holding valve of a high-pressure washer.

[0023] Figure 4 yes Figure 3 Enlarged diagram of point A in the middle.

[0024] In the diagram, 1. Piston pump; 1a. Pump head; 1b. Motor; 2. Valve body; 2a. Adjusting hole; 2b. Inlet channel; 2c. Outlet channel; 2c1. Left water hole; 2c2. Right water hole; 2d. Guide hole; 2e. Connector; 2f. Main body; 2g. Drain outlet; 2h. Inlet; 3. Microswitch; 4. Inlet pipe; 5. Outlet pipe; 6. One-way assembly; 6a. Valve core; 7. Adjusting rod; 7a. Annular seat; 7b. Sealing ring II; 7c. Sealing head; 7c1. Conical surface I; 7d. Upper rod; 7d1. External threaded column; 7e. Lower rod; 8. Closed cavity; 9. Water guide tube; 10. High pressure chamber; 11. Spring; 12. Sealing ring I; 13. Oil seal; 14. Retaining ring. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] Example 1: As Figure 2 As shown, the high-pressure washer includes a plunger pump 1 and a micro switch 3. Both the plunger pump 1 and the micro switch 3 are existing products. The plunger pump 1 includes a pump head 1a and a motor 1b, with the motor 1b located behind the pump head 1a. The micro switch 3 is used to control the start and stop of the motor 1b. This control method is existing common technology and will not be described in detail here.

[0027] Specifically like Figure 1 and Figure 3As shown, this pressure-holding valve includes a valve body 2 fixed to the front side of the pump head 1a. The valve body 2 has an adjusting hole 2a, an inlet channel 2b, and an outlet channel 2c formed within it. The adjusting hole 2a is a straight, vertically oriented hole; the inlet channel 2b and the outlet channel 2c are both horizontally oriented. The outlet channel 2c is located to the right of the adjusting hole 2a, and the adjusting hole 2a is located below the inlet channel 2b. The inlet channel 2b is open at its left end and closed at its right end, and a drain outlet 2g is provided at its rear side. Preferably, the upper end of the adjusting hole 2a extends to the inner wall of the inlet channel 2b to connect the two and shorten the distance between them. In the actual product, the axes of the inlet channel 2b and the outlet channel 2c are parallel; the left end of the inlet channel 2b is connected to the inlet pipe 4; and the right end of the outlet channel 2c is connected to the outlet pipe 5.

[0028] The inlet chamber on pump head 1a is connected to inlet channel 2b. In the actual product, the rear side of valve body 2 is pressed against pump head 1a, at which point drain outlet 2g is directly opposite and connected to the inlet chamber. There are at least two drain outlets 2g, distributed axially along inlet channel 2b. Furthermore, an annular sealing gasket is clamped between valve body 2 and pump head 1a. The annular sealing gasket is coaxial with the inlet chamber to prevent leakage.

[0029] The water outlet channel 2c consists of a connected left water hole 2c1 and a right water hole 2c2, which are continuously distributed in the left-right direction. The right water hole 2c2 contains a one-way component 6, which acts on the right end of the left water hole 2c1 to ensure unidirectional flow of the water outlet channel 2c from left to right. Specifically, the one-way component 6 includes a valve core 6a and a telescopic spring. The two ends of the telescopic spring act on the inner wall of the right water hole 2c2 and the right end of the valve core 6a, respectively. Under the action of the telescopic spring, the left end of the valve core 6a is pressed against the inner wall of the left water hole 2c1 to cut off the connection between the left water hole 2c1 and the right water hole 2c2.

[0030] An adjusting rod 7 is vertically slidably mounted inside the adjusting hole 2a. The lower end of the adjusting rod 7 extends out of the adjusting hole 2a and presses against the contact of the micro switch 3. In actual use, when the lower end of the adjusting rod 7 presses against the contact of the micro switch 3, the motor 1b is turned on; conversely, when the upper end of the adjusting rod 7 moves upward away from the contact of the micro switch 3, the motor 1b is turned off. An annular seat 7a is located on the outer wall of the middle part of the adjusting rod 7. The annular seat 7a and the adjusting rod 7 are coaxially arranged, and the outer wall of the annular seat 7a is in contact with and seals against the inner wall of the adjusting hole 2a. Further, an annular groove 2, coaxial with the adjusting rod 7, is formed on the outer wall of the annular seat 7a. A sealing ring 2b is provided in the annular groove 2, and the outer surface of the sealing ring 2b is in contact with and seals against the inner wall of the adjusting hole 2a, thereby enhancing the sealing performance between the annular seat 7a and the inner wall of the adjusting hole 2a.

[0031] A closed annular cavity 8 is formed between the lower side of the annular seat 7a and the inner wall of the adjusting hole 2a. The closed cavity 8 and the adjusting rod 7 are coaxially arranged, and the closed cavity 8 is connected to the right water hole 2c2 through a guide hole 2d formed in the valve body 2. Preferably, the guide hole 2d is a straight hole and is inclined, and its two ends are connected to the right water hole 2c2 and the closed cavity 8, respectively. With the above design, the material input of the valve body 2 can be reduced, and the valve body 2 can be made more compact.

[0032] The upper end of the adjusting rod 7 is a sealing head 7c, and the upper end of the adjusting hole 2a has a water guide tube 9. A high-pressure chamber 10 is formed between the upper side of the annular seat 7a and the water guide tube 9, and the high-pressure chamber 10 is connected to the water inlet channel 2b through the inner hole of the water guide tube 9. The left end of the left water hole 2c1 and the water outlet chamber on the pump head 1a are both connected to the high-pressure chamber 10. The sealing head 7c is located inside the water guide tube 9, and the high-pressure chamber 10 is provided with a spring 11 that causes the adjusting rod 7 to move downward and causes the sealing head 7c to cut off the inner hole of the water guide tube 9. In the actual product, the left end of the left water hole 2c1 extends to the inner wall of the high-pressure chamber 10 to connect the two; the rear wall of the high-pressure chamber 10 has an inlet 2h that faces and connects to the above-mentioned water outlet chamber, and an annular sealing gasket is provided at the edge of the outlet chamber to prevent water leakage.

[0033] In use, the water gun is connected to the right end of the outlet channel 2c. Water enters through the inlet channel 2b. Due to the sealing head 7c on the adjusting rod 7 being cut off by the spring 11, the water can only flow into the pump head 1a of the plunger pump 1 for pressurization. The pressurized water flows out through the outlet chamber of the plunger pump 1 to the high-pressure chamber 10, and then flows into the outlet channel 2c and is discharged through the water gun. When the water gun is turned off, the high-pressure water at the outlet channel 2c will backflow due to the motor 1b still running. Limited by the one-way component 6, the high-pressure water will enter the closed chamber 8 through the guide hole 2d, forcing the adjusting rod 7 to move upward against the elastic force of the spring 11 and open the inner hole of the water gun 9. At this time, the adjusting rod 7 moves away from the contact of the micro switch 3 to turn off the motor 1b. The high-pressure chamber 10 and the inlet channel 2b are connected, releasing the high pressure at the high-pressure chamber 10 and the pump head 1a of the plunger pump 1. After the high pressure is released, the adjusting rod 7 moves down to reset under the action of the spring 11 and cuts off the inner hole of the water gun 9 again, entering the low-pressure holding state.

[0034] The components for high-pressure release and low-pressure holding are integrated in the adjustment hole 2a, which greatly shortens the distance between the components. At the same time, the adjustment hole 2a is set to be vertical, which can effectively shorten the width of the valve body 2 in the axial direction of the plunger pump 1, making the structure after the plunger pump 1 and valve body 2 are combined more compact, reducing the overall length of the cleaning machine and reducing space occupation.

[0035] In this embodiment, like Figure 3 and Figure 4As shown, the water guide tube 9 is installed as follows: the water guide tube 9 is fixed inside the adjusting hole 2a, a seal is formed between the outer wall of the water guide tube 9 and the inner wall of the adjusting hole 2a, and the upper end of the water guide tube 9 extends into the water inlet channel 2b. This design shortens the distance between the water inlet channel 2b and the adjusting hole 2a, making the valve body 2 structure more compact. Preferably, the water guide tube 9 is cylindrical; an annular groove coaxial with the water guide tube 9 is formed on the outer wall of the water guide tube 9, and a sealing ring 12 is provided inside the annular groove. The outer surface of the sealing ring 12 contacts and seals the inner wall of the adjusting hole 2a, thereby increasing the sealing performance between the water guide tube 9 and the adjusting hole 2a.

[0036] The specific structure of valve body 2 is as follows: Valve body 2 consists of connector 2e and main body 2f, which is an integral structure. In this case, inlet channel 2b and outlet channel 2c are both located on main body 2f. A vertical straight hole for accommodating adjusting rod 7 and water guide cylinder 9 is also provided inside main body 2f. The upper end of connector 2e is fixed inside the lower end of the straight hole, and the inner hole of connector 2e and the straight hole together constitute the aforementioned adjusting hole 2a. In the actual product, the upper end of connector 2e is threaded into the straight hole, and the outer wall of connector 2e forms a seal with the inner wall of the straight hole through a sealing ring. Connector 2e is sleeved on the adjusting rod 7, and the inner wall of connector 2e forms a seal with the outer wall of adjusting rod 7 through oil seal 13. The lower side of the annular seat 7a, adjusting rod 7, oil seal 13, and connector 2e together form the aforementioned closed cavity 8. Further, a retaining ring 14 is coaxially fixed inside connector 2e. The retaining ring 14 is sleeved on the adjusting rod 7 with a clearance fit, and the retaining ring 14 is directly above the oil seal 13. A retaining ring 14 is installed above the oil seal 13 to prevent most of the high-pressure water flowing into the closed cavity 8 from impacting the oil seal 13, thus extending the service life of the oil seal 13. In the actual product, an annular step coaxial with the joint 2e is provided on the inner wall of the joint 2e. There are two annular steps, which are continuously distributed along the axial direction of the joint 2e. The retaining ring 14 and the oil seal 13 are respectively installed in the two annular steps.

[0037] In the actual product, the micro switch 3 is fixed at the lower end of the connector 2e.

[0038] It is preferable that the outer wall of the water guide tube 9 and the upper inner wall of the adjustment hole 2a are tightly fitted and fixed together. In this way, during assembly, the adjustment rod 7, the water guide tube 9 and the spring 11 are first assembled into a whole, then the whole is pressed into the straight hole, and finally the connector 2e is installed, which makes the assembly more convenient.

[0039] The spring 11 is installed as follows: The spring 11 is sleeved around the adjusting rod 7, with both ends of the spring 11 acting on the annular seat 7a and the water guide tube 9, respectively. The adjusting rod 7 consists of an upper rod 7d and a lower rod 7e, coaxially arranged and fixedly connected. The upper end of the upper rod 7d is the aforementioned sealing head 7c. The annular seat 7a is mounted on the lower rod 7e, and the lower end of the lower rod 7e extends out of the adjusting hole 2a and presses against the contact of the micro switch 3. Sleeving the spring 11 around the adjusting rod 7 reduces the diameter of the adjusting hole 2a, making the cleaning machine structure more compact.

[0040] The connection between the upper rod 7d and the lower rod 7e is as follows: a threaded hole is axially opened on the top surface of the lower rod 7e, and an external threaded post 7d1 matching the threaded hole is vertically formed on the bottom surface of the upper rod 7d. The external threaded post 7d1 is threaded into the threaded hole to facilitate the adjustment of the length of the adjusting rod 7 to adjust the compression of the spring 11, which is conducive to debugging.

[0041] like Figure 4 As shown, the sealing head 7c cuts off the inner hole of the water guide cylinder 9 in the following way: the side of the sealing head 7c is a conical surface 7c1 whose diameter gradually decreases from top to bottom. A second conical surface matching the first conical surface 7c1 is formed on the inner wall of the water guide cylinder 9. Under the action of the spring 11, the first conical surface 7c1 can be pressed against the second conical surface to form a seal. The cooperation of the first conical surface 7c1 and the second conical surface not only stably cuts off the inner hole of the water guide cylinder 9, but also uses the taper to correct the position of the adjusting rod 7, thereby improving the sliding accuracy of the adjusting rod 7 and ensuring stable operation of the cleaning machine.

[0042] Example 2: The structure and principle of Example 2 are basically the same as those of Example 1. The difference is that the sealing head 7c cuts off the inner hole of the water guide tube 9 in the following way: A ring-shaped sealing seat is formed on the inner wall of the water guide tube 9, and the sealing seat is coaxially arranged with the water guide tube 9. A ring-shaped rubber pad is fixed on the bottom surface of the sealing head 7c, and under the action of the spring 11, the rubber pad is pressed against the top surface of the sealing seat to form a seal.

[0043] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A pressure-holding valve for a high-pressure washer, comprising a valve body (2), wherein the valve body (2) has a vertically arranged adjusting hole (2a) and a horizontally arranged inlet channel (2b) and outlet channel (2c), a drain outlet (2g) is provided on the rear side of the inlet channel (2b), an adjusting rod (7) is vertically slidably arranged in the adjusting hole (2a), the lower end of the adjusting rod (7) extends out of the adjusting hole (2a), the outlet channel (2c) is composed of a connected left water hole (2c1) and a right water hole (2c2), a one-way component (6) is provided in the right water hole (2c2), the one-way component (6) acts on the right end of the left water hole (2c1) to make the outlet channel (2c) unidirectionally open from left to right, characterized in that, The regulating rod (7) has an annular seat (7a) on its outer wall in the middle, and the outer wall of the annular seat (7a) is in contact with and sealed to the inner wall of the regulating hole (2a); a closed cavity (8) is formed between the lower side of the annular seat (7a) and the inner wall of the regulating hole (2a), and the closed cavity (8) is connected to the right water hole (2c2) through the guide hole (2d) formed in the valve body (2); the upper end of the regulating rod (7) is a sealing head (7c), and the upper end of the regulating hole (2a) has a water guide cylinder (9), and the upper side of the annular seat (7a) and the water guide cylinder (9) are connected to the right water hole (2c2). A high-pressure chamber (10) is formed between the cylinders (9), and the high-pressure chamber (10) is connected to the water inlet channel (2b) through the inner hole of the water guide cylinder (9). The left end of the left water hole (2c1) is connected to the high-pressure chamber (10), and an inlet (2h) is provided on the rear side wall of the high-pressure chamber (10). The sealing head (7c) is located inside the water guide cylinder (9), and a spring (11) is provided inside the high-pressure chamber (10) to make the adjusting rod (7) move downward and make the sealing head (7c) cut off the inner hole of the water guide cylinder (9).

2. The pressure-holding valve for a high-pressure washer according to claim 1, characterized in that, The aforementioned regulating hole (2a) is located below the water inlet channel (2b). The upper end of the regulating hole (2a) extends to the inner wall of the water inlet channel (2b). The water guide tube (9) is fixed inside the regulating hole (2a). A seal is formed between the outer wall of the water guide tube (9) and the inner wall of the regulating hole (2a), and the upper end of the water guide tube (9) extends into the water inlet channel (2b).

3. The pressure-holding valve for a high-pressure washer according to claim 2, characterized in that, The spring (11) is sleeved on the outside of the adjusting rod (7), and the two ends of the spring (11) act on the annular seat (7a) and the water guide tube (9) respectively. The adjusting rod (7) consists of an upper rod (7d) and a lower rod (7e) that are coaxially arranged and fixedly connected. The upper end of the upper rod (7d) is the sealing head (7c) mentioned above. The annular seat (7a) is set on the lower rod (7e), and the lower end of the lower rod (7e) extends out of the adjusting hole (2a).

4. The pressure-holding valve for a high-pressure washer according to claim 3, characterized in that, The lower rod (7e) has an axially threaded hole on its top surface, and the upper rod (7d) has an external threaded post (7d1) that matches the threaded hole on its bottom surface. The external threaded post (7d1) is threaded into the threaded hole.

5. The pressure-holding valve for a high-pressure washer according to claim 2 or 3, characterized in that, The valve body (2) consists of a connector (2e) and a main body (2f) that is an integral structure. The main body (2f) has a vertical straight hole for accommodating the adjusting rod (7) and the water guide tube (9). The upper end of the connector (2e) is fixed inside the lower end of the straight hole, and the inner hole of the connector (2e) and the straight hole together constitute the above-mentioned adjusting hole (2a). The outer wall of the water guide tube (9) and the inner wall of the upper end of the adjusting hole (2a) are tightly fitted and fixed together. The inner wall of the connector (2e) forms a seal with the outer wall of the adjusting rod (7) through the oil seal (13), and the lower side of the annular seat (7a), the adjusting rod (7), the oil seal (13) and the connector (2e) together form the above-mentioned closed cavity (8).

6. The pressure-holding valve for a high-pressure cleaner according to claim 5, characterized in that, A retaining ring (14) is also coaxially fixed inside the connector (2e). The retaining ring (14) is sleeved outside the adjusting rod (7) and the two are fitted with a clearance. The retaining ring (14) is located directly above the oil seal (13).

7. The pressure-holding valve for a high-pressure washer according to claim 1, characterized in that, The side of the sealing head (7c) is a cone surface 1 (7c1) whose diameter gradually decreases from top to bottom. The inner wall of the water guide tube (9) is formed with a cone surface 2 that matches the cone surface 1 (7c1). Under the action of the spring (11), the cone surface 1 (7c1) can be pressed against the cone surface 2 to form a seal.

8. The pressure-holding valve for a high-pressure cleaner according to claim 1, characterized in that, The guide hole (2d) is a straight hole, and the guide hole (2d) is inclined. The two ends of the guide hole (2d) are connected to the right water hole (2c2) and the closed cavity (8) respectively.

9. The pressure-holding valve for a high-pressure cleaner according to claim 2, characterized in that, An annular groove coaxial with the water guide tube (9) is provided on the outer wall of the water guide tube (9). A sealing ring (12) is provided in the annular groove, and the outer side of the sealing ring (12) contacts and seals the inner wall of the adjustment hole (2a).

10. The pressure-holding valve for a high-pressure cleaner according to claim 1, characterized in that, The outer wall of the annular seat (7a) is provided with an annular groove 2 coaxial with the adjusting rod (7), and a sealing ring 2 (7b) is provided in the annular groove 2, and the outer side of the sealing ring 2 (7b) contacts and seals the inner wall of the adjusting hole (2a).

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