Pressure regulating valve

Abstract

This application relates to the field of high-pressure washer accessories, and more particularly to a pressure speed control valve, including a valve body, a valve stem, and an elastic component. The valve body includes a mating end with a water inlet and a flow channel. In the mating state, the water inlet communicates with the high-pressure zone of the pump body; the flow channel communicates with the water inlet; the valve body has a slide rail coaxially arranged with the mating end; the core rod includes a rod body and a piston coaxially arranged, and under the separation of the piston, the slide rail forms a closed pressurization zone communicating with the flow channel on the side of the piston axially away from the mating end; the elastic component is used to provide elastic force, so that the core rod has a tendency to move axially away from the mating end. In this application, during operation, the tension of the throttle cable on the valve stem, or the entire speed control valve, is basically on the axis of the valve body, which is beneficial to the stability of the connection between the mating end and the pump body.

Description

Technical Field

[0001] This application relates to the field of high-pressure cleaner accessories, and more particularly to a pressure speed regulating valve. Background Technology

[0002] Currently, some engine-type high-pressure cleaners typically have a speed control valve (sometimes called a regulator or speed controller) installed between the cleaner's gasoline engine and the high-pressure pump. The speed control valve can control the throttle opening and closing degree of the gasoline engine according to the working status of the high-pressure pump.

[0003] In related technologies, the speed control valve mainly includes a main body and a core rod located within the main body that can move axially relative to the main body. One end of the main body forms a docking end for connection with the high-pressure zone of the high-pressure pump. The throttle cable of the gasoline engine is controlled by the core rod. During operation, when the water gun of the cleaning machine is turned on for high-pressure operation, the high-pressure water flow enters the main body and pushes the core rod to move axially. In turn, the core rod pulls the throttle cable, thereby increasing the throttle opening and causing the gasoline engine to run at high speed, so that the cleaning machine enters the high-pressure operation state. Conversely, when the water gun stops working, under the paralysis effect within the speed control valve, the core rod returns to its initial state, thereby decreasing the throttle opening, so that the gasoline engine enters the idling state.

[0004] However, in the related technology, in the speed control valve that is in conjunction with the throttle cable, the cooperation structure between the throttle cable and the core rod is as follows: when the core rod moves away from the docking end, the throttle cable is pulled to increase the throttle opening; conversely, when the core rod moves closer to the docking end, the throttle cable resets step by step to decrease the throttle opening. For speed control valves using this cooperation structure, refer to the throttle adjustment mechanism for gasoline cleaning machines disclosed in announcement number CN205370770U.

[0005] While the speed control valve with the above-mentioned fitting structure can achieve speed regulation, it still has shortcomings in practical applications. The main issue is that, in this method, since the throttle cable opens the throttle when the core rod moves away from the docking end, it cannot be directly and coaxially mounted on the core rod. Instead, it can only be led out from the side of the core rod. In this case, the tension of the throttle cable on the core rod is off-axis. This can lead to some adverse effects. For example, during long-term operation, the connection point between the speed control valve and the high-pressure pump is prone to loosening due to the frequent pulling of the throttle cable. In addition, fixing the throttle cable to the side increases the radial dimension of the entire regulating valve, thus occupying more space. Utility Model Content

[0006] In order to solve at least one of the technical problems mentioned in the background art, the purpose of this application is to provide a pressure regulating valve.

[0007] To achieve the above objectives, this application provides the following technical solution.

[0008] This application provides a pressure regulating valve for installation on the pump body of a cleaning machine and connection to the throttle cable of an engine, comprising: The valve body includes a docking end and a flow channel. The docking end is used to dock with the valve body and includes a water inlet. In the docking state, the water inlet is connected to the high-pressure zone of the pump body. One end of the flow channel is connected to the water inlet, and the other end forms an output end. The valve body is provided with a slide rail coaxially arranged with the docking end. The core rod includes a rod body and a piston arranged on the same axis. Both the rod body and the piston are slidably and sealingly fitted in a slide rail, allowing the core rod to move axially along the slide rail. Under the separation of the piston, the slide rail forms a closed pressurization zone on the side of the piston axially away from the docking end. The pressurization zone is connected to the output end of the flow channel, so that the water output from the high-pressure zone of the pump body can flow into the pressurization zone through the flow channel to push the piston axially towards the docking end. The throttle cable can be coaxially mounted on the core rod. An elastic member is used to provide an elastic force, under which the core rod tends to move axially away from the mating end.

[0009] As an optional embodiment of this application, the piston protrudes radially from the rod body to form a stepped surface. The slide includes a first slide adapted to the rod body and a second slide adapted to the piston. The first slide and the second slide are coaxially arranged. In the assembled state, the rod body is slidably and sealingly fitted in the first slide, and the piston is slidably and sealingly fitted in the second slide.

[0010] As an optional embodiment of this application, a first sealing ring is embedded between the outer peripheral wall of the rod and the inner peripheral wall of the first slide, and / or a second sealing ring is embedded between the outer peripheral wall of the piston and the inner peripheral wall of the second slide.

[0011] As an optional embodiment of this application, a first sealing ring is embedded between the outer peripheral wall of the rod and the inner peripheral wall of the first slide, and the portion of the rod located between the first sealing ring and the step surface is fitted with the first slide to form a gap area.

[0012] As an optional embodiment of this application, a limiting surface is formed at the end of the first slide near the piston portion, and an end side is formed at the end of the second slide away from the docking end. In the axial direction, a hollow area is formed between the end side and the limiting surface at an interval, and the output end of the flow channel is connected to the gap area through the hollow area.

[0013] As an optional implementation of this application, in the initial state, the step surface abuts against the limiting surface, and there is a gap between the step surface and the limiting surface that connects the gap area and the hollow area, so that the water flowing into the hollow area can flow into the gap area through the gap.

[0014] As an optional embodiment of this application, the valve body is provided with a guide assembly, and the first slide is formed in the guide assembly; the guide assembly includes a sealing gasket, a retaining ring and a pressure plate stacked axially in sequence, and a first sealing ring is pressed between the retaining ring and the pressure plate; a third sealing ring is embedded between the outer periphery of the sealing gasket and the inner peripheral wall of the valve body.

[0015] As an optional embodiment of this application, the valve body includes a valve seat and a valve cover, which are detachably joined together axially; and the guide assembly is pressed between the valve body and the valve cover.

[0016] As an optional embodiment of this application, the end of the rod away from the docking end is provided with a first connecting part for connecting the core of the throttle cable; the valve body is provided with a second connecting part for connecting the sleeve of the throttle cable; in the assembled state, the core of the throttle cable moves along the axial direction of the valve body through the second connecting part and is fixed by the first connecting part, and the sleeve of the throttle cable is fixed or abuts against the second connecting part.

[0017] As an optional embodiment of this application, the slide forms a movable chamber on the piston portion near the docking end, and the movable chamber is connected to the ambient air pressure; and / or the flow channel is formed in the wall of the valve body.

[0018] Compared with the prior art, this application has the following advantages: Firstly, in this application, the logic of the valve stem controlling the throttle cable action is as follows: when the valve stem moves closer to the docking end, the throttle cable is pulled to increase the throttle opening; conversely, when the valve stem moves away from the docking end, the throttle cable retracts to reset, thereby reducing the throttle opening. Thanks to this method, the throttle cable can be installed on the lever in a basically coaxial state. Thus, during operation, the tension of the throttle cable on the valve stem, or rather the entire speed control valve, is basically on the axis of the valve body, which is beneficial to the stability of the connection between the docking end and the pump body.

[0019] Furthermore, in this application, the throttle cable can be directly led out from one axial end of the valve body. Compared with the method of fixing the throttle cable to the side, this application does not require a component to fix the throttle cable to the side of the valve body. This helps to reduce the radial dimension of the entire regulating valve, making the whole device more compact and not requiring more radial space.

[0020] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0021] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0022] Figure 1 A schematic diagram of the structure of this application is shown; Figure 2 This invention presents a structural schematic diagram showing the throttle cable installed. Figure 3 It shows Figure 2 A magnified view of a portion of the image; Figure 4 This invention presents a structural schematic diagram showing the state in which the core rod pulls the throttle cable. Figure 5 A partial schematic diagram of the guide member in the state where the core rod has been removed is shown; Figure 6 A schematic diagram of the valve seat structure of this application is shown; Figure 7 A partial structural schematic diagram of the valve stem of this application is shown; Figure 8 A schematic diagram of the structure of the second connecting part of this application is shown.

[0023] Explanation of the labels in the diagram: 1. Valve body; 11. Valve seat; 111. Connecting end; 112. Water inlet; 113. Flow channel; 114. Air vent; 115. Installation area; 12. Valve cover; 2. Slide; 21. First slide; 22. Second slide; 23. Gap area; 24. Hollow area; 25. Limiting surface; 26. End side; 3. Core rod; 31. Rod body; 32. Piston; 320. Stepped surface; 321. Second sealing ring; 4. Spring; 5. Guide assembly; 51. Sealing gasket; 52. Retaining ring; 53. First sealing ring; 54. Pressure plate; 55. Third sealing ring; 6. First connecting part; 61. End; 611. First wire through hole; 612. Locking bolt; 7. Second connecting part; 71. Connector; 711. Second wire guide hole; 712. Positioning hole. Detailed Implementation

[0024] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Example 1 Reference Figures 1-8 As shown, this embodiment provides a pressure speed regulating valve for installation on the pump body of a cleaning machine and connection to the throttle cable M of the engine.

[0026] The cleaning machine here is mainly an engine-type high-pressure cleaner, which mainly consists of an engine, a pump body, and a spray gun. The engine is mainly a gasoline engine, and the throttle opening and closing action of the gasoline engine is controlled by the throttle cable M. It can be understood that the structure of the throttle cable M is similar to that of a brake cable. It mainly consists of a wire core M2 and a sleeve M2 that goes through the outside of the wire core M2. The wire core M2 can be pulled relative to the sleeve M2 to control the opening and closing of the throttle. Generally speaking, when the wire core M2 is stretched relative to the sleeve M2, the throttle opening increases, and when the wire core M2 returns to its original position, the throttle opening decreases.

[0027] The pressure regulating valve (hereinafter referred to as the regulating valve) provided in this embodiment, also known as the speed control valve, is mainly used to be installed on the pump body and linked with the throttle cable M. When the pump body is performing high-pressure operation, that is, when the spray gun is turned on to output high-pressure water flow, the high-pressure water flow enters the high-pressure zone in the pump body, thereby driving the regulating valve to act, pulling the core M2 of the throttle cable M to control the throttle opening of the gasoline engine to increase, so that the gasoline engine speed increases to meet the high-pressure operation of the pump body; conversely, when the spray gun is turned off, the high-pressure zone in the pump body will not form a high-pressure water flow, so the regulating valve automatically resets to the initial state, and the core M2 of the throttle cable M also resets relative to the sleeve M2 under the action of related components, thereby reducing the throttle opening and putting the cleaning machine into idle state.

[0028] like Figure 1 As shown, the regulating valve provided in this embodiment mainly includes a valve body 1, a core rod 3, and elastic components, etc. The following is a detailed explanation of each component.

[0029] The valve body 1, as the main body of the entire regulating valve, is used for direct installation on the pump body of the cleaning machine. Typically, the pump body has a connection port that communicates with the high-pressure zone within the pump body. A mating end 111 is formed on the end side of the valve body 1, and the mating end 111 is installed on the connection port of the main body to achieve the installation of the valve body 1. For example, as... Figure 1 As shown, the mating end 111 can be a threaded head structure, which is installed on the connection port of the pump body in a threaded manner.

[0030] like Figure 1 As shown, in some embodiments, the valve body 1 is generally cylindrical in shape, and the mating end 111 is basically coaxially arranged with the valve body 1, that is, the axis of the valve body 1 and the axis of the mating end 111 are basically coincident. Unless otherwise specified, the axial direction claimed in this embodiment can be understood as the axial direction of the valve body 1. L1 in the figure can be understood as the axis of the valve body. In addition, the coaxial arrangement claimed in this embodiment can be understood as the axes of the corresponding two components coinciding.

[0031] In addition, a water inlet hole 112 is provided in the docking end 111. When the docking end 111 is installed on the valve body 1, that is, in the docking state, the water inlet hole 112 is connected to the high pressure zone of the pump body.

[0032] In addition, the valve body 1 is provided with a flow channel 113 for water flow. In some embodiments, the flow channel 113 is directly opened in the wall of the valve body 1, for example, on the peripheral wall of the valve body 1.

[0033] Moreover, one end of the flow channel 113 is connected to the water inlet 112, and the other end serves as the output end for outputting high-pressure water flow. That is, when the cleaning machine is operating under high pressure, the high-pressure water flow in the high-pressure zone of the pump body enters the flow channel 113 through the water inlet 112 and is finally output from the output end of the flow channel 113.

[0034] In some embodiments, a specific valve body 1 structure is provided: like Figure 1 As shown, the valve body 1 includes a valve seat 11 and a valve cover 12, which are axially connected. Preferably, the two are connected to each other in a detachable manner, for example, by threaded engagement. The mating end 111 is preferably located on the end side of the valve seat 11.

[0035] In addition, such as Figure 5 As shown, the valve body 1 is provided with a slide 2 coaxially arranged with the docking end 111. For example, in this embodiment, the slide 2 is arranged in the valve seat 11. In addition, the valve cover 12 is provided with an installation space that can accommodate related components.

[0036] The core rod 3 is basically coaxial with the slide rail 2, passes through the slide rail 2, and can move relative to the slide rail 2 along the axial direction of the slide rail 2.

[0037] Combination Figure 2 and Figure 7 As shown, the valve stem provided in this embodiment mainly includes a stem body 31 and a piston 32 arranged on the same axis. In some embodiments, the stem body 31 and / or the piston 32 are basically cylindrical.

[0038] Both the rod body 31 and the piston 32 are slidably and sealed in the slide rail 2, so that the core rod 3 can move axially along the slide rail 2.

[0039] Here, a slidable sealing fit can be understood as two mating parts that can slide relative to each other and also form a sealing relationship.

[0040] Furthermore, under the separation of piston 32, slide 2 is divided into a pressurizing zone and a movable chamber located on both sides of piston 32 along its axial direction; the pressurizing zone is a closed structure located on the side of piston 32 away from docking end 111 along its axial direction, while the movable chamber is located on the side of piston 32 closer to docking end 111 along its axial direction. Figure 1 Taking the perspective as an example, it can also be understood that the slide 2 forms a pressurization zone on the upper side of the piston 32 and a movable chamber on the lower side of the piston 32 (the movable chamber can be understood as part of the second slide 22). The piston 32 can slide axially within the movable chamber.

[0041] To prevent the piston 32 from moving downwards due to high air pressure in the movable chamber when it moves towards the docking end 111 (i.e., downwards), in some embodiments, it is preferable to connect the movable chamber to the ambient air pressure. For example, an air hole 114 is provided at the bottom of the valve seat 11, and the movable chamber is connected to the external environment through the air hole 114.

[0042] The pressurization zone is connected to the output end of the flow channel 113 so that the water output from the high-pressure zone of the pump body can flow into the pressurization zone through the flow channel 113 to push the piston 32 to move axially toward the docking end 111.

[0043] The throttle cable can be mounted on the core rod 3 in a substantially coaxial manner. Specifically, the core M2 of the throttle cable M is fixed on the core rod 3 and pulled by the core rod 3.

[0044] The elastic member is mainly used to provide elastic force. Under the action of the elastic force, the core rod 3 tends to move axially away from the mating end 111. That is, the elastic member provides an upward elastic thrust to the core rod 3 to drive the core rod 3 to reset.

[0045] Thus, when the cleaning machine is operating under high pressure, the high-pressure water flow entering the high-pressure zone of the pump body will sequentially enter the pressurization zone through the water inlet 112 and the flow channel 113, thereby forming a high-pressure water flow in the pressurization zone. Under the pressure of the high-pressure water flow in the pressurization zone, the piston 32 will be pushed to move towards the docking end 111 (i.e., move downward). As a result, the rod body 31 will also move downward, and then the rod body 31 will pull the core M2 of the throttle cable M to move downward relative to the sleeve M2 of the throttle cable M. Thus, under the pull of the throttle cable M, the throttle of the gasoline engine will be opened, and the gasoline engine will enter a high-speed state to provide sufficient power to adapt to the high-pressure operation of the cleaning machine.

[0046] Conversely, when the spray gun is turned off, the high-pressure water flow in the high-pressure zone of the pump body is released, thus causing the high-pressure water flow in the pressurization zone to disappear. Then, under the elastic force of the elastic component, the core rod 3 is pushed upward to reset. In this way, the core M2 of the throttle cable M will also gradually retract, thereby reducing the throttle opening and causing the gasoline engine to enter the idling state to reduce fuel consumption.

[0047] It is worth noting that in this application, the logic of the valve stem controlling the throttle cable M is as follows: when the valve stem moves closer to the docking end 111, the throttle cable M is pulled to increase the throttle opening; conversely, when the valve stem moves away from the docking end 111, the throttle cable M retracts to reset, thereby reducing the throttle opening. Thanks to this method, the throttle cable M can be installed on the pull rod in a basically coaxial state. Thus, during operation, the pulling force of the throttle cable M on the valve stem, or rather the entire speed control valve, is basically on the axis of the valve body 1, which is beneficial to the stability of the connection between the docking end 111 and the pump body.

[0048] Furthermore, in this application, the throttle cable M can be directly led out from one axial end of the valve body 1. Compared with the method of fixing the throttle cable M to the side, this application does not require setting a component to fix the throttle cable M to the side of the valve body 1. This helps to reduce the radial dimension of the entire regulating valve, making the whole device more compact and not requiring more radial space.

[0049] In some embodiments, a specific mating structure is provided for the rod body 31 and piston 32 with the slide 2, specifically: like Figure 7 As shown, the diameter of piston 32 is larger than the diameter of rod 31, so that piston 32 can protrude radially from rod 31 to form a stepped surface 320; correspondingly, as Figure 5 As shown, the slide 2 includes a first slide 21 adapted to the rod body 31 and a second slide 22 adapted to the piston 32. The first slide 21 and the second slide 22 are arranged on the same axis. It can be understood that since the first slide 21 and the second slide 22 are adapted to the rod body 31 and the piston 32 respectively, the diameter of the first slide 21 is smaller than the diameter of the second slide 22, so as to adapt to the rod body 31 and the piston 32 respectively.

[0050] In the assembled state, such as Figure 4 As shown, the rod body 31 is slidably and sealingly fitted in the first slide rail 21, for example, as Figure 3 As shown, a first sealing ring 53 is embedded between the outer peripheral wall of the rod body 31 and the inner peripheral wall of the first slide 21. The first sealing ring 53 is kept in a fixed position, and its inner ring abuts against the outer peripheral wall of the rod body 31, so that the two can slide relative to each other and form a seal.

[0051] Similarly, the piston 32 is slidably and sealingly fitted in the second slide 22, for example, as Figure 3 As shown, a second sealing ring 321 is embedded between the outer peripheral wall of the piston 32 and the inner peripheral wall of the second slide 22, wherein the second sealing ring 321 is relatively fixed to the piston 32, and its outer ring abuts against the inner peripheral wall of the second slide 22.

[0052] In some embodiments, the slide 2 is specifically constructed as follows: Figure 5 As shown, the second slide 22 is opened inside the valve seat 11; the first slide 21 is formed by a guide assembly 5 installed inside the valve body 1, that is, the guide assembly 5 has a channel in the center for the rod body 31 to pass through, and this channel serves as the first slide 21.

[0053] In this embodiment, the guide component 5 has two functions: firstly, it guides the axial sliding of the valve stem; secondly, it can form a sliding seal between the stem body 31 and the second slide 22.

[0054] In some embodiments, a specific guiding component 5 is provided, such as... Figure 5 As shown, it includes a sealing gasket 51, a retaining ring 52 and a pressure plate 54 stacked axially in sequence. It can be understood that in this embodiment, the sealing gasket 51, the retaining ring 52 and the pressure plate 54 are all annular structures so that the rod body 31 can pass through. At this time, the annular hole of the guide assembly 5 is equivalent to forming the aforementioned first slide 21.

[0055] The specific installation structure of guide component 5 is as follows: Figure 6 As shown, a mounting area 115 for mounting guide assembly 5 is formed within the valve seat 11, located on the upper side of the second slide rail 22 (i.e., the side away from the mating end 111); combined with Figure 5 As shown, the sealing gasket 51, the retaining ring 52, and the pressure plate 54 are coaxially installed in the mounting area 115 from top to bottom; the first sealing ring 53 is sandwiched between the retaining ring 52 and the pressure plate 54, and the retaining ring 52 is pressed between the sealing gasket 51 and the first sealing ring 53; under the pressure of the valve cover 12, the guide assembly 5 is axially pressed into the mounting area 115.

[0056] To ensure the sealing performance of the outer periphery of the guide assembly 5, in some embodiments, a third sealing ring 55 is embedded between the outer periphery of the sealing gasket 51 and the inner peripheral wall of the valve body 1, that is, the third sealing ring 55 is embedded between the outer peripheral wall of the sealing gasket 51 and the inner peripheral wall of the mounting area 115 to form a seal. The retaining ring 52 mainly acts as a skeleton, providing support for the sealing gasket 51, the first sealing ring 53, and the third sealing ring 55.

[0057] In some embodiments, the first sealing ring 53, the second sealing ring 321, and the third sealing ring 55 may all be O-rings.

[0058] In some embodiments, the aforementioned pressurized zone is specifically constructed as follows: like Figure 3 As shown, the portion of the rod body 31 located between the first sealing ring 53 and the stepped surface 320 is in clearance fit with the first slide rail 21 to form a gap area 23. Here, clearance fit means that there is a gap between the rod body 31 and the first slide rail 21. At this time, the aforementioned gap area 23 constitutes part of the pressurization zone.

[0059] The first slide 21 forms a limiting surface 25 near the piston 32 (i.e., the lower end of the first slide 21). Specifically, in this embodiment, it can also be understood that the lower end surface of the pressure plate 54 forms a limiting surface 25.

[0060] The end of the second slide 22 away from the docking end 111 (i.e. the upper end of the second slide 22) forms an end side 26, which can also be understood as the bottom surface of the mounting area 115.

[0061] In the axial direction, such as Figure 5 As shown, a hollow area 24 is formed between the end side surface 26 and the limiting surface 25. This means that the limiting surface 25 is raised a certain height in the axial direction relative to the end side surface 26 to form the hollow area 24. For example, a portion of the bottom surface of the pressure plate 54 near the outer periphery protrudes axially downward and abuts against the end side surface 26, thereby raising the limiting surface 25 a certain height in the axial direction relative to the end side surface 26.

[0062] The output end of the flow channel 113 is connected to the gap region 23 through the hollow region 24. In some embodiments, the output end of the flow channel 113 is opened on the aforementioned end side 26 so that it can be directly connected to the hollow region 24. In addition, the hollow region 24 is also connected to the gap region 23. At this time, the high-pressure water flow output by the flow channel 113 can enter the gap region 23 through the hollow region 24 to generate sufficient water pressure to push the piston 32 to move axially downward.

[0063] It is understandable that the hollow region 24 is also part of the pressurization region at this time. In other words, the pressurization region includes at least the gap region 23 and the hollow region 24. In addition, it is worth noting that in this embodiment, the volume of the pressurization region is not constant. It is equivalent to a floating chamber, and its volume will change according to the moving position of the piston 32. For example, in the initial state, the pressurization region is equivalent to a combination of the hollow region 24 and the gap region 23. When the piston 32 moves downward a certain distance so that the step surface 320 is lower than the end side surface 26, the pressurization region is equivalent to the hollow region 24, the gap region 23, and the area between the step surface 320 and the end side surface 26.

[0064] Additionally, in the initial state, such as Figure 2As shown, when no water pressure is applied to the pressurized zone, the core rod 3 is pushed by the elastic force of the elastic component, and the stepped surface 320 abuts against the limiting surface 25. There is a gap between the stepped surface 320 and the limiting surface 25 that connects the gap area 23 and the hollow area 24, so that the water flowing into the hollow area 24 can flow into the gap area 23 through the gap. That is to say, the stepped surface 320 and the limiting surface 25 are not completely fitted together. At least there must be a gap between them so that the high-pressure water flow in the hollow area 24 can flow into the gap area 23 through the gap.

[0065] The gap can be formed by creating a radially arranged groove on the limiting surface 25 and / or the step surface 320. When the step surface 320 and the limiting surface 25 are in contact, the groove is equivalent to the aforementioned gap, and the water flow in the hollow area 24 can enter the gap area 23 through the water channel.

[0066] Of course, in some other alternative embodiments, the stepped surface 320 or the limiting surface 25 may have a protrusion to lift them axially a certain distance from each other. Alternatively, the stepped surface 320 and / or the limiting surface 25 may be rough surfaces so that when they are fitted together, they do not form a seal but rather some small gaps, which serve as areas for water flow.

[0067] In order to enable the throttle cable M to be installed coaxially, in some embodiments, the end of the lever body 31 away from the docking end 111 is provided with a first connecting part 6 for connecting the core M2 of the throttle cable; the valve body 1 is provided with a second connecting part 7 for connecting the sleeve M2 of the throttle cable M; in the assembled state, the core M2 of the throttle cable M moves along the axial direction of the valve body 1 through the second connecting part 7 and is fixed by the first connecting part 6, and the sleeve M2 of the throttle cable M is fixed or abuts against the second connecting part 7.

[0068] The first connecting part 6 is preferably detachably mounted on the rod body 31, for example, as shown in the example. Figure 1 As shown, the first connecting part 6 includes an end 61, which is threadedly installed on the rod body 31. Specifically, the rod body 31 has an axially extending connecting hole, and the end of the connecting hole away from the piston 32 is a threaded hole structure. One end of the end 61 is threadedly inserted into the connecting hole. The end 61 also has a first cable passage hole 611 extending axially along the rod body 31. A locking bolt 612 is threadedly connected to the side of the end 61. During installation, the core M2 of the throttle cable M passes through the first cable passage hole 611. Then, by tightening the locking bolt 612, the core M2 of the throttle cable M is pressed against the first cable passage hole 611 through the inner end of the locking bolt 612.

[0069] In addition, such as Figure 1 and Figure 8As shown, the second connecting part 7 is also detachably mounted on the rod body 31. For example, the second connecting part 7 includes a connector 71 that is threaded along the valve body 1 to the top of the valve cover 12 and is substantially coaxial with the valve stem. The connector 71 has a second wire hole 711 that is substantially coaxial with the valve stem. The top of the second wire hole 711 is widened to form a positioning hole 712 for the sleeve M2 of the positioning throttle cable M.

[0070] During installation, the core M2 of the throttle cable M passes through the second cable hole 711 and is fixed to the first connecting part 6. The end of the sleeve M2 of the throttle cable M is inserted into the positioning hole 712 and abuts against the bottom of the positioning hole 712 to restrict the sleeve M2 from entering the second cable hole 711. Of course, in some other optional embodiments, the sleeve M2 can also be directly fixed in the positioning hole 712 by a fixed connection.

[0071] Thus, when the lever 31 moves downward, the lever 31 will pull the core M2 of the throttle cable M downward relative to the sleeve M2 of the throttle cable M, thereby causing the core M2 of the throttle cable M to increase the throttle opening of the gasoline engine, so that the gasoline engine can provide sufficient power for the cleaning machine to perform high-pressure operation.

[0072] In some embodiments, the elastic member may be a spring 4, which is sleeved on the rod body 31. Its two ends abut against the end 61 and the guide member, respectively. Specifically, the lower end of the spring 4 abuts against the upper wall of the sealing gasket 51 of the guide member. The spring 4 generates an upward elastic thrust on the push head to push the core rod 3 to reset.

[0073] Example 2 Reference Figures 1-8 As shown, this embodiment provides a high-pressure cleaner based on embodiment 1, which includes a pump body and an engine-type gasoline engine, wherein the throttle cable M of the gasoline engine is installed on the pump body through the speed control valve provided in embodiment 1.

[0074] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0076] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pressure governor valve for mounting on a pump body of a cleaning machine and for connection to a throttle pull wire of an engine, characterised in that, include: The valve body includes a docking end and a flow channel. The docking end is used to dock with the valve body and includes a water inlet. In the docking state, the water inlet is connected to the high-pressure zone of the pump body. One end of the flow channel is connected to the water inlet, and the other end forms an output end. The valve body is provided with a slide rail coaxially arranged with the docking end. The core rod includes a rod body and a piston arranged on the same axis. Both the rod body and the piston are slidably and sealingly fitted in a slide rail, allowing the core rod to move axially along the slide rail. Under the separation of the piston, the slide rail forms a closed pressurization zone on the side of the piston axially away from the docking end. The pressurization zone is connected to the output end of the flow channel, so that the water output from the high-pressure zone of the pump body can flow into the pressurization zone through the flow channel to push the piston axially towards the docking end. The throttle cable can be coaxially mounted on the core rod. An elastic member is used to provide an elastic force, under which the core rod tends to move axially away from the mating end.

2. The pressure regulating valve according to claim 1, characterized in that, The piston protrudes radially from the rod body to form a stepped surface. The slide includes a first slide adapted to the rod body and a second slide adapted to the piston. The first slide and the second slide are arranged on the same axis. In the assembled state, the rod body is slidably and sealingly fitted in the first slide, and the piston is slidably and sealingly fitted in the second slide.

3. The pressure regulating valve according to claim 2, characterized in that, A first sealing ring is embedded between the outer peripheral wall of the rod and the inner peripheral wall of the first slide, and / or a second sealing ring is embedded between the outer peripheral wall of the piston and the inner peripheral wall of the second slide.

4. The pressure regulating valve according to claim 2, characterized in that, A first sealing ring is embedded between the outer peripheral wall of the rod and the inner peripheral wall of the first slide. The portion of the rod located between the first sealing ring and the stepped surface is fitted with the first slide to form a gap area.

5. The pressure regulating valve according to claim 4, characterized in that, The first slide rail forms a limiting surface at the end near the piston, and the second slide rail forms an end side surface at the end away from the docking end. In the axial direction, a hollow area is formed between the end side surface and the limiting surface at an interval, and the output end of the flow channel is connected to the gap area through the hollow area.

6. The pressure regulating valve according to claim 5, characterized in that, In the initial state, the step surface and the limiting surface abut against each other, and there is a gap between the step surface and the limiting surface that connects the gap area and the hollow area, so that the water flowing into the hollow area can flow into the gap area through the gap.

7. The pressure regulating valve according to claim 2, characterized in that, The valve body is provided with a guide assembly, and the first slide is formed in the guide assembly; the guide assembly includes a sealing gasket, a retaining ring and a pressure plate stacked axially in sequence, and a first sealing ring is pressed between the retaining ring and the pressure plate; a third sealing ring is embedded between the outer periphery of the sealing gasket and the inner peripheral wall of the valve body.

8. The pressure regulating valve according to claim 7, characterized in that, The valve body includes a valve seat and a valve cover, which are detachably joined together axially; and the guide assembly is pressed between the valve body and the valve cover.

9. The pressure regulating valve according to claim 1, characterized in that, The rod body has a first connecting part for connecting the core of the throttle cable at the end away from the docking end; the valve body has a second connecting part for connecting the sleeve of the throttle cable; in the assembled state, the core of the throttle cable moves along the axial direction of the valve body through the second connecting part and is fixed by the first connecting part, and the sleeve of the throttle cable is fixed or abuts against the second connecting part.

10. The pressure regulating valve according to claim 1, characterized in that, The slide forms a movable chamber on the piston section near the docking end, and the movable chamber is connected to the ambient air pressure; and / or the flow channel is formed in the wall of the valve body.

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