A pressure-regulating plunger pump controlled by a water gun

Abstract

The present invention relates to a pressure-regulating plunger pump for water gun control, which includes a motor, a plunger pump, and a water gun. The plunger pump is driven by the motor to operate, and the water gun is connected to the plunger pump through a high-pressure water pipe. A total water inlet pipe, a return water inlet pipe, a water outlet pipe, and a high-pressure water flow cavity are provided on the pump body of the plunger pump. The total water inlet pipe and the return water inlet pipe are connected to the cooling circulation cavity on the motor through a circulation device. One end of the water outlet pipe is connected to the high-pressure water flow cavity, and the other end is connected to a communication pipe in the water gun through a high-pressure water pipe. The present invention has the advantages of compact structure, stable performance, and convenient control of the water flow size.

Description

Technical Field

[0001] The present invention belongs to the technical field of plunger pumps, and particularly relates to a pressure-regulating plunger pump controlled by a water gun. Background Art

[0002] A high-pressure washer is a machine that uses a power device (motor, gasoline engine or diesel engine) to make a high-pressure plunger pump generate high-pressure water to wash the surface of an object, and realizes the washing of the surface of the object through a water gun connected to the high-pressure plunger pump. The power device, high-pressure plunger pump and water gun in the existing high-pressure washer have the following defects:

[0003] 1. Generally, the motors in the existing power devices basically use fan blades for heat dissipation. Using fan blades for heat dissipation not only has slow heat dissipation, but also generates high noise; there are also some water-cooled motors in the existing ones, but the existing water-cooled motors have a relatively complex structure, slow operation of the cooling system, and relatively simple functions;

[0004] 2. Generally, the existing control of the water flow rate and speed of the water gun is achieved through a pressure-regulating valve on the high-pressure plunger pump. In this way, during the process of washing the surface of an object with the water gun, the adjustment is very inconvenient, and the adjustment of the water flow rate during the washing process cannot be carried out in a timely manner;

[0005] 3. The high-pressure plunger pump used in the high-pressure washers on the market is an important device for distributing cleaning fluid. The rationality of the position distribution of each valve in the pump body and the structure design of the pump body itself can affect the performance and pressure stabilization effect of the entire high-pressure washer. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies existing in the prior art, and provide a pressure-regulating plunger pump controlled by a water gun with a compact structure, stable performance and convenient control of the water flow rate.

[0007] The object of the present invention is achieved by the following technical solutions. This pressure-regulating plunger pump controlled by a water gun includes a motor, a plunger pump, and a water gun. The plunger pump is driven by the motor to operate, and the water gun is connected to the plunger pump through a high-pressure water pipe. A total water inlet pipe, a return water inlet pipe, a water outlet pipe, and a high-pressure water flow cavity are provided on the pump body of the plunger pump. The total water inlet pipe and the return water inlet pipe are connected to the cooling circulation cavity on the motor through a circulation device. One end of the water outlet pipe is connected to the high-pressure water flow cavity, and the other end is connected to a communication pipe in the water gun through a high-pressure water pipe. A first mounting seat for mounting a main valve and a second mounting seat for mounting a pressure stabilizing valve are installed between the high-pressure water flow cavity and the water outlet pipe. The first mounting seat is connected to the second mounting seat, and the first mounting seat is connected to the water outlet pipe. The second mounting seat is respectively connected to the high-pressure water flow cavity and the working cavity of the pump body. A stop valve and a pressure-regulating valve for adjusting the water flow rate are sequentially installed on the communication pipe in the water gun. The valve rod column of the stop valve is hinged to the trigger in the water gun.

[0008] Preferably, a cavity housing consistent with the shape of the housing is fixed on the outer surface of the housing of the motor, and the cooling circulation cavity is formed between the cavity housing and the housing. A third mounting seat is installed between the total water inlet pipe and the return water inlet pipe, and the return water inlet pipe is connected to the working cavity of the pump body. The circulation device includes a first connecting pipe and a second connecting pipe. A water passing seat is installed on the housing wall of the cavity housing, and the first connecting pipe and the second connecting pipe are connected through the water passing seat. A fourth mounting seat is installed between the first connecting pipe and the second connecting pipe, and the fourth mounting seat is connected and fixedly installed with the third mounting seat.

[0009] Preferably, two through holes are provided on the housing wall of the cavity housing. The first through hole is connected to the first connecting pipe connected to the water passing seat, and the second through hole is connected to the second connecting pipe connected to the water passing seat. A water separating rib is provided along the axial direction of the housing wall of the cavity housing, and the water separating rib is located between the first through hole and the second through hole. The water separating rib is in close contact with the outer surface of the housing of the motor, and two annular grooves for installing O-ring seals are provided on the housing wall of the cavity housing. The two annular grooves are respectively located on both sides of the water separating rib.

[0010] Preferably, the pressure-regulating valve includes a first valve body, a first valve core, and a valve rod. The first valve body is integrally formed with the communication pipe. The first valve core is located in the valve cavity of the first valve body, and the valve cavity is communicated with the communication pipe. One end of the valve rod is integrally formed with the first valve core and is located in the first valve body. The other end of the valve rod is a knob end and is located outside the gun housing of the water gun. The first valve core is a rectangular body structure, and the end faces adapted to the valve cavity wall are respectively the left end face, the right end face, the front end face, and the rear end face, and the valve cavity wall is circular.

[0011] Preferably, the left end face is integrally formed by an arc surface and a concave surface, and the arc surface and the concave surface each account for half of the whole left end face; the right end face is an arc surface, the distance between the right end face and the valve cavity wall is equal to the distance between the concave surface of the left end face and the valve cavity wall, and the arc surface of the left end face is in close contact with the valve cavity wall; the front end face and the rear end face are both flat surfaces, and the distance between the front end face and the valve cavity wall is equal to the distance between the rear end face and the valve cavity wall.

[0012] Preferably, a number of flow channels for installing one-way valves are provided in the working cavity of the pump body, a number of channels arranged in sequence are provided in the high-pressure water flow-through cavity, and the channels are sequentially communicated and one-way valves are installed in the channels; a number of channels in the high-pressure water flow-through cavity are in one-to-one correspondence and communicated with a number of flow channels in the working cavity through flow pipes.

[0013] Preferably, the pipe wall of the water outlet pipe is communicated with the working cavity of the pump body through a transition channel, the water outlet pipe is communicated with the end channel in the high-pressure water flow-through cavity, and an overflow valve is installed in the water outlet pipe, and a controller for controlling the start and stop of the plunger pump is installed on the water outlet pipe; the side wall of the second mounting seat is communicated with the end channel in the high-pressure water flow-through cavity, and the bottom end of the second mounting seat is communicated with the working cavity of the pump body; the side wall of the first mounting seat is communicated with the side wall of the second mounting seat through a transition channel, and the bottom end of the first mounting seat is communicated with the water outlet pipe.

[0014] Preferably, the pressure stabilizing valve includes a second valve body, a valve seat and a second valve core. The valve seat is installed in the second mounting seat, and a first water flow hole is provided at the radial end of the valve seat. The second valve body is fixedly installed on the second mounting seat by a threaded connection method, and a second water flow hole is provided at the radial end of the second valve body. A valve sleeve is installed between the second valve body and the valve seat; the second valve core is inserted and movably arranged on the second valve body, the valve sleeve and the valve seat, and one end of the second valve core is in contact with the water return port provided at the center of the bottom of the valve seat, and the other end of the second valve core is embedded in a spring retaining ring, and a spring is installed between the spring retaining ring and the pressure regulating knob.

[0015] Preferably, two water inlet channels are provided on the side wall of the second mounting seat, and one water return channel is provided at the bottom of the second mounting seat. Among them, the first water inlet channel is communicated with the first water flow hole and is also communicated with the side wall of the first mounting seat. The second water inlet channel is communicated with the second water flow hole and is also communicated with the high-pressure water flow-through cavity. The water return channel is communicated with the water return port and is also communicated with the working cavity of the pump body.

[0016] Preferably, the outer diameter of the middle core of the second spool is larger than that of the two end cores. The middle core is located inside the second valve body. One end of the two end cores is fixed to the spring retainer, and the other end is in contact with the water return port, and the end face of this end is arc-shaped.

[0017] The beneficial effects of the present invention are as follows: 1. By directly arranging a pressure regulating valve inside the water gun, during the process of flushing the surface of an object with the water gun, the water flow and flow rate can be timely adjusted through the pressure regulating valve. Compared with the prior art, it has the advantages of compact structure, convenient pressure regulation, and the ability to adjust the pressure at any time through the water gun; 2. By the combined use of a water-cooled motor and a plunger pump, it not only supplies water to the plunger pump but also achieves the effect of quickly and stably cooling the motor, having the advantages of better operation stability, longer service life, and convenient use of the entire plunger pump. At the same time, through the modular installation method between the water-cooled motor and the plunger pump, the installation and disassembly are more convenient, and the total water inlet pipe is located at the plunger pump end, making the volume more compact and the cooling effect of the motor better; 3. Through the new structural design of the pump body and the reasonable arrangement of the positions of some components required on the pump body, during the use of the high-pressure cleaner, it has the advantages of compact volume, more stable performance, and convenient maintenance. A pressure stabilizing valve mounting seat is added to the pump body, making the pressure stabilizing effect of the entire pump body better; 4. By adopting the pressure stabilizing valve of this design and being used in combination with the pump body, during the use process, it has the advantages of better sealing performance, more compact structure, more stable performance, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic three-dimensional structure of the present invention Figure 1 。

[0019] Figure 2 is a schematic three-dimensional structure of the present invention Figure 2 。

[0020] Figure 3 is a schematic diagram of the cooling circulation cavity structure of the present invention.

[0021] Figure 4 is a schematic diagram of the pump body structure of the present invention Figure 1 。

[0022] Figure 5 is a schematic diagram of the pump body structure of the present invention Figure 2 。

[0023] Figure 6 is a schematic diagram of the pump body structure of the present invention Figure 3 。

[0024] Figure 7 is a schematic diagram of the pressure stabilizing valve structure of the present invention.

[0025] Figure 8It is a schematic front view sectional structure diagram between the connecting pipe and the pressure regulating valve of the present invention.

[0026] Figure 9 It is a schematic structure diagram of the water flow state flowing through the pressure regulating valve of the present invention Figure 1 .

[0027] Figure 10 It is a schematic structure diagram of the water flow state flowing through the pressure regulating valve of the present invention Figure 2 .

[0028] Figure 11 It is a schematic structure diagram of the water flow state flowing through the pressure regulating valve of the present invention Figure 3 .

[0029] The reference numerals in the drawings are respectively: 1, motor; 2, plunger pump; 3, water gun; 4, high-pressure water pipe; 5, cooling circulation cavity; 6, main valve; 7, pressure stabilizing valve; 8, pressure regulating valve; 9, stop valve; 10, cavity housing; 11, housing; 12, third mounting seat; 13, first connecting pipe; 14, second connecting pipe; 15, water passing seat; 16, fourth mounting seat; 17, first through hole; 18, second through hole; 19, water separating rib; 20, annular groove; 21, main water inlet pipe; 22, return water inlet pipe; 23, water outlet pipe; 24, high-pressure water flow cavity; 25, first mounting seat; 26, second mounting seat; 27, working cavity; 28, flow pipe; 29, controller; 31, connecting pipe; 32, trigger; 24-1, channel; 26-1, return water channel; 26-2, first water inlet channel; 26-3, second water inlet channel; 27-1, flow channel; 71, second valve body; 72, valve seat; 73, second valve core; 74, valve sleeve; 75, spring retainer; 76, pressure regulating knob; 77, spring; 71-1, second water flow hole; 72-1, first water flow hole; 72-2, water return port; 73-1, intermediate core body; 73-2, end core bodies; 81, first valve body; 82, first valve core; 83, valve rod; 84, valve cavity; 82-1, left end face; 82-2, right end face; 82-3, front end face; 82-4, rear end face; 84-1, valve cavity wall; 91, valve rod column. Detailed implementation manners

[0030] The present invention will be described in detail below with reference to the accompanying drawings: The present invention includes a motor 1, a plunger pump 2, and a water gun 3. The plunger pump 2 is driven by the motor 1 to operate. The water gun 3 is connected to the plunger pump 2 through a high-pressure water pipe 4. A main water inlet pipe 21, a return water inlet pipe 22, a water outlet pipe 23, and a high-pressure water flow cavity 24 are provided on the pump body of the plunger pump 2. A circulation device is provided between the main water inlet pipe 21 and the return water inlet pipe 22 to communicate with a cooling circulation cavity 5 on the motor 1. One end of the water outlet pipe 23 communicates with the high-pressure water flow cavity 24, and the other end communicates with a communication pipe 31 in the water gun 3 through the high-pressure water pipe 4. A first mounting seat 25 for mounting a main valve 6 and a second mounting seat 26 for mounting a pressure stabilizing valve 7 are installed between the high-pressure water flow cavity 24 and the water outlet pipe 23. The first mounting seat 25 communicates with the second mounting seat 26, and the first mounting seat 25 communicates with the water outlet pipe 23. The second mounting seat 26 communicates with the high-pressure water flow cavity 24 and the working cavity 27 of the pump body respectively. A stop valve 9 and a pressure regulating valve 8 for adjusting the water flow rate are sequentially installed on the communication pipe 31 in the water gun 3. The valve rod column 91 of the stop valve 9 is hinged to a trigger 32 in the water gun 3. Its working principle is as follows:

[0031] The high-pressure cleaner passes water into the first connecting pipe 13 through the main water inlet pipe 21 provided on the pump body, then enters the first through hole 17 of the cavity housing 10 through the water passing seat 15, and flows into the cavity housing 10, flows around the cooling circulation cavity 5 for one circle until it flows to the second through hole 18 of the cavity housing 10, then enters the second connecting pipe 14 through the water passing seat 15, and flows through the return water inlet pipe 22 along the second connecting pipe 14, and flows into the working cavity 27 of the pump body through the return water inlet pipe 22. Then the water in the working cavity 27 enters the flow channels 27-1 respectively and generates high-pressure water through the operation of the plunger pump and flows into the channel 24-1 of the high-pressure water flow cavity 24 through their respective flow pipes 28. This high-pressure water flows into the water outlet pipe 23 through the end channel, enters the high-pressure water pipe 4 from the water outlet pipe 23, and directly enters the communication pipe 31 in the water gun 3. Through the adjustment of the pressure regulating valve 8, the water flow rate in the communication pipe 31 in the water gun 3 can be controlled.

[0032] As shown in the appendix Figure 1 、 3As shown, a cavity housing 10 with the same shape as the housing is fixed on the outer surface of the housing 11 of the motor 1, and a cooling circulation cavity 5 is formed between the cavity housing 10 and the housing 11; a third mounting seat 12 is installed between the main water inlet pipe 21 and the return water inlet pipe 22, and the return water inlet pipe 22 is communicated with the working cavity 27 of the pump body; the circulation device includes a first connecting pipe 13 and a second connecting pipe 14. A water passing seat 15 is installed on the housing wall of the cavity housing 10. The first connecting pipe 13 and the second connecting pipe 14 are connected through the water passing seat 15. A fourth mounting seat 16 is installed between the first connecting pipe 13 and the second connecting pipe 14, and the fourth mounting seat 16 is communicated with and fixedly installed on the third mounting seat 12; through the detachable modular installation method between the third mounting seat 12 and the fourth mounting seat 16, the connection pipe between the motor and the plunger pump is more conveniently installed.

[0033] In order to separate the water flow flowing into the cooling circulation cavity 5, two through holes are provided on the housing wall of the cavity housing 10. The first through hole 17 is communicated with the first connecting pipe 13 connected to the water passing seat 15, and the second through hole 18 is communicated with the second connecting pipe 14 connected to the water passing seat 15; in order to prevent the water flow in the annular cavity from cross-flowing, a water separation rib 19 is provided along the axial direction of the housing wall of the cavity housing 10, and the water separation rib 19 is located between the first through hole 17 and the second through hole 18; the water separation rib 19 is in close contact with the outer surface of the housing 11 of the motor 1, and two annular grooves 20 for installing O-ring seals are provided on the housing wall of the cavity housing 10, and the two annular grooves 20 are respectively located on both sides of the water separation rib 19. The cavity housing 10 is fixed on the outer surface of the housing 11 of the motor 1 by welding or sealed assembly; in order to reasonably arrange the water-cooling structure on the whole motor, the length of the cavity housing 10 is 1 / 3 to 1 / 2 of the length of the housing 11 of the motor 1.

[0034] By the combined use of the water-cooled motor and the plunger pump, it not only supplies water to the plunger pump, but also can achieve the effect of quickly and stably cooling the motor, having the advantages of better operation stability, longer service life and more convenient use of the whole plunger pump; at the same time, through the modular installation method between the water-cooled motor and the plunger pump, the installation and disassembly are more convenient, and the main water inlet pipe is located at the plunger pump end, making the volume more compact and the cooling effect of the motor better.

[0035] As attached Figure 2 、 8As shown in the figure, the pressure regulating valve 8 includes a first valve body 81, a first valve core 82, and a valve rod 83. The first valve body 81 is integrally formed with the connecting pipe 31. The first valve core 82 is located in the valve cavity 84 of the first valve body 81, and the valve cavity 84 communicates with the connecting pipe 31. The water flow rate in the connecting pipe 31 is controlled by the rotational movement of the first valve core 82. One end of the valve rod 83 is integrally formed with the first valve core 82 and is located inside the first valve body 81, which makes the synchronization of the valve core and the valve rod consistent, making it more convenient to control and also more convenient for disassembly and installation. The other end of the valve rod 83 is a knob end and is located outside the gun housing of the water gun 3. When the water flow rate of the water gun needs to be adjusted, at this time, as long as the knob end is held and rotated, the movement of the valve core can be achieved. The first valve core 82 is a rectangular body structure, and the end faces adapted to the valve cavity wall 84-1 are the left end face 82-1, the right end face 82-2, the front end face 82-3, and the rear end face 82-4 respectively, and the valve cavity wall 84-1 is circular in shape.

[0036] The left end face 82-1 is integrally formed by an arc surface and a concave surface, and the arc surface and the concave surface each account for half of the whole left end face. The right end face 82-2 is an arc surface. The distance between the right end face 82-2 and the valve cavity wall 84-1 is equal to the distance between the concave surface of the left end face 82-1 and the valve cavity wall 84-1, and the arc surface of the left end face 82-1 is in close contact with the valve cavity wall 84-1. The front end face 82-3 and the rear end face 82-4 are both flat surfaces, and the distance between the front end face 82-3 and the valve cavity wall 84-1 is equal to the distance between the rear end face 82-4 and the valve cavity wall 84-1. Its working principle is: by rotating the valve core counterclockwise,

[0037] As shown in the attached Figure 9 figure, its state is that the water flow rate is the largest. At this time, the front end face 82-3 and the rear end face 82-4 are parallel to the water flow direction of the connecting pipe 31, and the water flow in the water gun is the largest amount.

[0038] As shown in the attached Figure 10 figure, its state is that the water flow rate is reduced. At this time, the front end face 82-3 and the rear end face 82-4 are at an oblique angle to the water flow direction of the connecting pipe 31, and the distance between the right end face 82-2 and the valve cavity wall 84-1 remains unchanged. The arc surface of the left end face 82-1 is getting farther and farther away from the water flow hole of the valve cavity wall where the connecting pipe is located, and the water flow rate in the water gun gradually decreases.

[0039] As shown in the attached Figure 11 figure, its state is that the water flow rate is the smallest. At this time, the front end face 82-3 and the rear end face 82-4 are perpendicular to the water flow direction of the connecting pipe 31, and the distance between the right end face 82-2 and the valve cavity wall 84-1 remains unchanged. The arc surface of the left end face 82-1 is completely perpendicular to the water flow hole of the valve cavity wall where the connecting pipe is located, and the water flow rate in the water gun is in the smallest state.

[0040] By directly installing a pressure regulating valve inside the water gun, during the process of flushing an object's surface with the water gun, the water flow and flow rate can be timely adjusted through the pressure regulating valve. Compared with the prior art, it has the advantages of compact structure, convenient pressure regulation, and the ability to adjust the pressure at any time through the water gun.

[0041] As shown in the Figures 4 to 6 attachment, several flow channels 27-1 for installing check valves are provided in the working chamber 27 of the pump body. To make the high-pressure water flow through cavity structure more compact and the spatial position distribution more reasonable, several channels 24-1 arranged in sequence are provided in the high-pressure water flow through cavity 24, and the channels 24-1 are connected in sequence and check valves are installed in the channels; several channels 24-1 in the high-pressure water flow through cavity 24 and several flow channels 27-1 in the working chamber 27 are connected in one-to-one correspondence through the connecting pipe 28.

[0042] The pipe wall of the water outlet pipe 23 is connected to the working chamber 27 of the pump body through a transition channel. The water outlet pipe 23 is connected to the end channel in the high-pressure water flow through cavity 24, and an overflow valve is installed in the water outlet pipe 23. A controller 29 for controlling the start and stop of the plunger pump is installed on the water outlet pipe 23; the side wall of the second mounting seat 26 is connected to the end channel in the high-pressure water flow through cavity 24, and the bottom end of the second mounting seat 26 is connected to the working chamber 27 of the pump body, with a more compact structure, better overall performance of the pump body, and better voltage stabilizing effect of the voltage stabilizing valve; the side wall between the first mounting seat 25 and the side wall of the second mounting seat 26 is connected through a transition channel, and the bottom end of the first mounting seat 25 is connected to the water outlet pipe 23; such a structural distribution enables the main valve to protect the performance of the voltage stabilizing valve in a timely manner during the control process, and the performance of the entire pump body is also better.

[0043] Through the new structural design of the pump body and the reasonable arrangement of the orientations of some components required on the pump body, during the use of the high-pressure cleaner, it has the advantages of compact volume, more stable performance, and convenient maintenance; and a voltage stabilizing valve mounting seat is added to the pump body, making the voltage stabilizing effect of the entire pump body better.

[0044] As shown in the Figure 5 attachment, 7As shown in the figure, the pressure stabilizing valve 7 includes a second valve body 71, a valve seat 72, and a second valve core 73. The valve seat 72 is installed in the second mounting seat 26, and a first water flow hole 72-1 is provided at the radial end of the valve seat 72. The second valve body 71 is fixedly installed on the second mounting seat 26 by means of threaded connection, and a second water flow hole 71-1 is provided at the radial end of the second valve body 71. A valve sleeve 74 is installed between the second valve body 71 and the valve seat 72; the second valve core 73 is inserted and movably arranged on the second valve body 71, the valve sleeve 74 and the valve seat 72, and one end of the second valve core 73 is in contact with a water return port 72-2 provided at the center of the bottom of the valve seat 72. The other end of the second valve core 73 is embedded on a spring retainer 75, and a spring 77 is installed between the spring retainer 75 and the pressure regulating knob 76, and the pressure regulating knob 26 is fixedly connected to the valve body 21 by means of threaded connection. Its working principle is as follows:

[0045] When the high-pressure water gun shuts off or other water supply is cut off, the pressure in the pump will increase at this time. Under the action of the water pressure, the high-pressure water in the pump enters the second water flow hole 71-1 in the valve body 71 through the second water inlet channel 26-3 on the pump body, and causes the second valve core 73 to move upward against the spring force. At this time, the second valve core 73 is separated from the water return port 72-2. The high-pressure water in the high-pressure water gun section enters the first water flow hole 72-1 in the valve seat 72 through the first water inlet channel 26-2, and returns water through the water return port 72-2, and the pressure of the pump body drops, and the second valve core reaches a new balance state; when the high-pressure water gun is opened, the second valve core 73 resets. At this time, the second valve core 73 abuts against the water return port 72-2, and the high-pressure piston pump resumes operation.

[0046] Two water inlet channels are provided on the side wall of the second mounting seat 26, and a water return channel 26-1 is provided at the bottom of the second mounting seat 26. Among them, the first water inlet channel 26-2 communicates with the first water flow hole 72-1, and the first water inlet channel 26-2 communicates with the side wall of the first mounting seat 25. The second water inlet channel 26-3 communicates with the second water flow hole 71-1, and the second water inlet channel 26-3 communicates with the high-pressure water flow cavity 24. The water return channel 26-1 communicates with the water return port 72-2, and the water return channel 26-1 communicates with the working cavity 27 of the pump body.

[0047] In order to enable the second valve core 73 to move up and down smoothly and make the structure of the entire pressure stabilizing valve more compact, the outer diameter of the middle core body 73-1 of the second valve core 73 is larger than the outer diameters of the two end core bodies 73-2. The middle core body 73-1 is located in the second valve body 71. One end of each of the two end core bodies 73-2 is fixed to the spring retainer 75, and the other end is in contact with the water return port 72-2. The end face of this end is arc-shaped, and the arc-shaped end face contacts the corner end of the water return port 72-2, so that the sealing performance is better.

[0048] By adopting the pressure stabilizing valve of the present design and using it in conjunction with the pump body, during use, it has the advantages of better sealing performance, more compact structure, more stable performance, and low cost.

[0049] The present invention is not limited to the above embodiments. No matter what changes are made in its shape or material composition, as long as the structural design provided by the present invention is adopted, it is a variation of the present invention and should be considered within the protection scope of the present invention.

Claims

1. A pressure-regulating piston pump controlled by a water gun, comprising a motor (1), a piston pump (2), and a water gun (3). The piston pump (2) is driven by the motor (1) to operate, and the water gun (3) is connected to the piston pump (2) through a high-pressure water pipe (4); characterized in that: The pump body of the plunger pump (2) is provided with a main water inlet pipe (21), a return water inlet pipe (22), a water outlet pipe (23) and a high-pressure water flow cavity (24). A circulation device is provided between the main water inlet pipe (21) and the return water inlet pipe (22) to communicate with a cooling circulation cavity (5) on the motor (1). One end of the water outlet pipe (23) is communicated with the high-pressure water flow cavity (24), and the other end is communicated with a communication pipe (31) in the water gun (3) through a high-pressure water pipe (4). A first mounting seat (25) for mounting a main valve (6) and a second mounting seat (26) for mounting a pressure stabilizing valve (7) are installed between the high-pressure water flow cavity (24) and the water outlet pipe (23). The first mounting seat (25) is communicated with the second mounting seat (26), and the first mounting seat (25) is communicated with the water outlet pipe (23). The second mounting seat (26) is respectively communicated with the high-pressure water flow cavity (24) and the working cavity (27) of the pump body. A stop valve (9) and a pressure regulating valve (8) for adjusting the water flow rate are sequentially installed on the communication pipe (31) in the water gun (3). The valve rod column (91) of the stop valve (9) is hinged with a trigger (32) in the water gun (3). The pressure stabilizing valve (7) includes a second valve body (71), a valve seat (72), and a second valve core (73). The valve seat (72) is installed in the second mounting seat (26), and a first water flow hole (72-1) is opened at the radial end of the valve seat (72). The second valve body (71) is fixedly installed on the second mounting seat (26) by a threaded connection method, and a second water flow hole (71-1) is opened at the radial end of the second valve body (71). A valve sleeve (74) is installed between the second valve body (71) and the valve seat (72). The second valve core (73) is inserted and movably arranged on the second valve body (71), the valve sleeve (74) and the valve seat (72). One end of the second valve core (73) is in contact with a water return port (72-2) provided at the center of the bottom of the valve seat (72). The other end of the second valve core (73) is embedded on a spring retainer ring (75), and a spring (77) is installed between the spring retainer ring (75) and a pressure regulating knob (76). The pipe wall of the water outlet pipe (23) is communicated with the working cavity (27) of the pump body through a transition channel. The water outlet pipe (23) is communicated with the end channel in the high-pressure water flow cavity (24), and an overflow valve is installed in the water outlet pipe (23). A controller (29) for controlling the start and stop of the plunger pump is installed on the water outlet pipe (23). The side wall of the second mounting seat (26) is communicated with the end channel in the high-pressure water flow cavity (24), and the bottom end of the second mounting seat (26) is communicated with the working cavity (27) of the pump body. The side wall of the first mounting seat (25) is communicated with the side wall of the second mounting seat (26) through a transition channel, and the bottom end of the first mounting seat (25) is communicated with the water outlet pipe (23).

2. The pressure-regulating piston pump controlled by a water gun according to claim 1, characterized in that: A cavity housing (10) having the same shape as the housing is fixed on the outer surface of the housing (11) of the motor (1), and a cooling circulation cavity (5) is formed between the cavity housing (10) and the housing (11); A third mounting seat (12) is installed between the main water inlet pipe (21) and the return water inlet pipe (22), and the return water inlet pipe (22) communicates with the working cavity (27) of the pump body; The circulation device includes a first connecting pipe (13) and a second connecting pipe (14). A water passing seat (15) is installed on the housing wall of the cavity housing (10). The first connecting pipe (13) and the second connecting pipe (14) are connected through the water passing seat (15). A fourth mounting seat (16) is installed between the first connecting pipe (13) and the second connecting pipe (14), and the fourth mounting seat (16) communicates with and is fixedly installed on the third mounting seat (12).

3. The pressure-regulating piston pump controlled by a water gun according to claim 2, characterized in that: Two through holes are provided on the housing wall of the cavity housing (10). The first through hole (17) communicates with the first connecting pipe (13) connected to the water passing seat (15), and the second through hole (18) communicates with the second connecting pipe (14) connected to the water passing seat (15); A water blocking rib (19) is provided along the axial direction of the housing wall of the cavity housing (10), and the water blocking rib (19) is located between the first through hole (17) and the second through hole (18); The water blocking rib (19) is in close contact with the outer surface of the housing (11) of the motor (1), and two annular grooves (20) for installing O-ring seals are provided on the housing wall of the cavity housing (10), and the two annular grooves (20) are respectively located on both sides of the water blocking rib (19).

4. The pressure-regulating piston pump controlled by a water gun according to claim 1, characterized in that: The pressure regulating valve (8) includes a first valve body (81), a first valve core (82), and a valve rod (83). The first valve body (81) and the connecting pipe (31) are integrally formed. The first valve core (82) is located in the valve cavity (84) of the first valve body (81), and the valve cavity (84) communicates with the connecting pipe (31); One end of the valve rod (83) is integrally formed with the first valve core (82) and is located inside the first valve body (81); The other end of the valve rod (83) is a knob end and is located outside the gun housing of the water gun (3); The first valve core (82) is a rectangular body structure, and the end faces adapted to the valve cavity wall (84-1) are respectively a left end face (82-1), a right end face (82-2), a front end face (82-3), and a rear end face (82-4), and the valve cavity wall (84-1) is circular in shape.

5. The pressure-regulating piston pump controlled by a water gun according to claim 4, characterized in that: The left end face (82-1) is integrally formed by an arc face and a concave face, and the arc face and the concave face each account for half of the whole left end face; the right end face (82-2) is an arc face, the distance between the right end face (82-2) and the valve cavity wall (84-1) is equal to the distance between the concave face of the left end face (82-1) and the valve cavity wall (84-1), and the arc face of the left end face (82-1) is in close contact with the valve cavity wall (84-1); the front end face (82-3) and the rear end face (82-4) are both flat surfaces, and the distance between the front end face (82-3) and the valve cavity wall (84-1) is equal to the distance between the rear end face (82-4) and the valve cavity wall (84-1).

6. The pressure-regulating piston pump controlled by a water gun according to claim 1, characterized in that: A number of flow channels (27-1) for installing one-way valves are provided in the working cavity (27) of the pump body, a number of channels (24-1) arranged in sequence are provided in the high-pressure water flow-through cavity (24), and the channels (24-1) are connected in sequence and one-way valves are installed in the channels; a number of channels (24-1) in the high-pressure water flow-through cavity (24) and a number of flow channels (27-1) in the working cavity (27) are in one-to-one correspondence and connected through a flow pipe (28).

7. The pressure-regulating piston pump controlled by a water gun according to claim 1, characterized in that: Two water inlet channels are provided on the side wall of the second mounting seat (26), and a water return channel (26-1) is provided at the bottom of the second mounting seat (26). Among them, the first water inlet channel (26-2) communicates with the first water flow hole (72-1), and the first water inlet channel (26-2) is connected to the side wall of the first mounting seat (25), the second water inlet channel (26-3) communicates with the second water flow hole (71-1), and the second water inlet channel (26-3) is connected to the high-pressure water flow-through cavity (24), the water return channel (26-1) communicates with the water return port (72-2), and the water return channel (26-1) is connected to the working cavity (27) of the pump body.

8. The pressure-regulating piston pump controlled by a water gun according to claim 1, characterized in that: The outer diameter of the middle core body (73-1) of the second valve core (73) is larger than the outer diameters of the two end core bodies (73-2), and the middle core body (73-1) is located in the second valve body (71). One end of each of the two end core bodies (73-2) is fixed to the spring retainer (75), and the other end is in contact with the water return port (72-2), and the end face of the other end is arc-shaped.

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