Leakage-preventing internal circulation type plunger pump

Abstract

The present invention discloses an anti-leakage internal circulation plunger pump. A plunger is provided in the pump body, and a water outlet and a water outlet cavity are provided on the pump cover. A check valve is provided in the water outlet. An inlet is provided on the pump body. A pressurizing cavity corresponding to the plunger is provided in the pump body. An inlet cavity is formed by connecting between the pump body and the pump cover. The inlet cavity, the pressurizing cavity, and the water outlet cavity are communicated in sequence. A check valve is provided in the inlet cavity. Water entering from the inlet enters the pressurizing cavity through the check valve. A return channel is provided on the pump cover, and the return channel communicates the pressurizing cavity and the inlet cavity. A sealing assembly that is in dynamic sealing cooperation with the plunger is provided in the pressurizing cavity. The water leaking between the pressurizing cavity and the sealing assembly flows along the sealing assembly through the return channel and the check valve and then returns to the pressurizing cavity. For the anti-leakage internal circulation plunger pump of the present invention, after the sealing structure on the plunger leaks due to high pressure, the leaked water can be returned to the inlet cavity through the internal flow channel, preventing the water from leaking outside the pump body and not affecting the normal use of the plunger pump.

Description

Technical Field

[0001] The present invention relates to the field of plunger pumps, and particularly to an anti-leakage internal circulation plunger pump for a cleaning machine. Background Art

[0002] Traditional plunger pumps include an inlet valve, an outlet valve, and an exchange chamber connected to them. A reciprocating plunger is arranged in the exchange chamber. When the plunger moves away from the exchange chamber, the pressure in the exchange chamber is negative. At this time, the outlet valve closes and the inlet valve opens, sucking the low-pressure water in the liquid inlet chamber into the exchange chamber through the inlet valve. When the plunger moves into the exchange chamber, the pressure in the exchange chamber is high. At this time, the inlet valve closes and the outlet valve opens, pressing the high-pressure water in the exchange chamber into the high-pressure chamber through the outlet valve. In this way, a complete cycle of changing water from low pressure to high pressure is completed.

[0003] Since the extrusion of the plunger on water will form high pressure, the sealing performance between the plunger and the exchange chamber determines the effect of high pressure. In order to improve the sealing performance between the plunger and the exchange chamber, a sealing ring is generally installed between the plunger and the exchange chamber. It can be seen from the process of the reciprocating movement of the plunger that half of the time of the sealing ring is in a high-pressure state. It is subjected to the extrusion of high-pressure water and generates a large clamping force on the surface of the plunger. Since the movement of the plunger is not only a reciprocating linear movement, but also a rotational movement and a slight swing, there will always be a small amount of water leakage at the joint between the surface of the plunger and the sealing ring. These waters may accumulate on the other side of the exchange chamber and may leak to the outside of the pump body. Summary of the Invention

[0004] The main technical problem to be solved by the present invention is to provide an anti-leakage internal circulation plunger pump, which can, after the sealing structure on the plunger leaks due to high pressure, return the leaked water to the inlet chamber through an internal flow channel, avoid water leakage to the outside of the pump body, and will not affect the normal use of the plunger pump.

[0005] To solve the above technical problem, a technical solution adopted by the present invention is: to provide an anti-leakage internal circulation plunger pump, including a pump body and a pump cover. A plunger is arranged in the pump body. An outlet and an outlet chamber are arranged on the pump cover. An outlet check valve is arranged in the outlet. An inlet is arranged on the pump body. A boosting chamber corresponding to the plunger is provided in the pump body. An inlet chamber is formed by connecting the pump body and the pump cover. The inlet chamber, the boosting chamber, and the outlet chamber are communicated in sequence. A check valve is arranged in the inlet chamber. The water entering through the inlet enters the boosting chamber through the check valve. A return channel is arranged on the pump cover. The return channel connects the boosting chamber and the inlet chamber. A sealing component that is in dynamic sealing cooperation with the plunger is provided in the boosting chamber. The water leaked between the boosting chamber and the sealing component flows back to the boosting chamber through the check valve along the sealing component from the return channel.

[0006] In a preferred embodiment of the present invention, a reflux chamber A is formed between the pressurizing chamber and the sealing assembly, a reflux chamber B is formed between the one-way valve and the water inlet chamber, and the reflux chamber A and the reflux chamber B are communicated through a reflux channel.

[0007] In a preferred embodiment of the present invention, the one-way valve is provided with a reflux hole, and a valve port communicating with the water inlet is opened at the lower end. The reflux chamber B is communicated with the reflux hole, and the water in the reflux chamber B enters the one-way valve through the reflux hole and then merges with the water at the water inlet and flows through the one-way valve to the pressurizing chamber.

[0008] In a preferred embodiment of the present invention, the reflux holes are arranged at equal intervals along the circumferential direction of the surface of the one-way valve, and the reflux holes are above the valve port of the one-way valve.

[0009] In a preferred embodiment of the present invention, the sealing assembly includes a high-pressure water seal and a low-pressure water seal arranged in the pressurizing chamber. The high-pressure water seal and the low-pressure water seal are sleeved on the plunger. The internal leakage between the plunger and the high-pressure water seal causes the water in the pressurizing chamber to enter the reflux chamber through the low-pressure water seal.

[0010] In a preferred embodiment of the present invention, the low-pressure water seal is provided with a diversion hole. The gap between the low-pressure water seal and the pressurizing chamber forms the reflux chamber A, and the diversion hole is communicated with the reflux chamber A.

[0011] In a preferred embodiment of the present invention, the lower end of the low-pressure water seal is installed in the pump body and is hermetically connected between the pump body, the pump cover and the plunger. The upper end extends into the pressurizing chamber, and the diversion hole is located at the upper end of the low-pressure water seal.

[0012] In a preferred embodiment of the present invention, a sealing pressure ring is further installed inside the lower end of the low-pressure water seal. The sealing pressure ring is hermetically connected with the plunger, and the sealing pressure ring is located in the pump body.

[0013] In a preferred embodiment of the present invention, the water inlet chamber includes a lower water inlet chamber opened on the pump body and an upper water inlet chamber opened on the pump cover. The pump body and the pump cover are connected to communicate the upper water inlet chamber and the lower water inlet chamber to form the water inlet chamber. The lower water inlet chamber is communicated with the water inlet, and the upper water inlet chamber is communicated with the pressurizing chamber.

[0014] In a preferred embodiment of the present invention, the one-way valve is installed in the upper water inlet chamber. The gap between the one-way valve and the upper water inlet chamber forms the reflux chamber B. The lower end of the one-way valve is hermetically connected between the cylinder block and the cylinder head.

[0015] The beneficial effects of the present invention are as follows: For the anti-leakage internal circulation plunger pump of the present invention, a reflux channel is added between the pressurizing chamber and the water inlet chamber. After the high-pressure water in the pressurizing chamber leaks internally between the plunger and the sealing assembly, it can return to the water inlet chamber through the reflux channel and then flow to the pressurizing chamber again through the check valve inside the water inlet chamber, avoiding the leakage of the water in the pressurizing chamber to the outside of the pump body and realizing the circulation of the internally leaked water.

[0016] For the anti-leakage internal circulation plunger pump of the present invention, sealing is achieved between the high-pressure water seal, low-pressure water seal, and sealing pressure ring and the plunger. A reflux chamber A is formed between the low-pressure water seal and the pressurizing chamber. When leakage occurs between the high-pressure water seal and the plunger due to operation, the water in the pressurizing chamber will flow through the low-pressure water seal, enter the reflux chamber, and then enter the reflux channel. Under the action of the low-pressure water seal and the sealing pressure ring, the leaked water can be prevented from leaking from other parts, ensuring that the leaked water can achieve internal circulation.

[0017] For the anti-leakage internal circulation plunger pump of the present invention, a reflux chamber B is formed between the check valve and the water inlet chamber. The leaked water flowing out of the reflux channel flows into the reflux chamber B, and then enters the check valve along the reflux hole of the check valve from the reflux chamber B. After converging with the original high-pressure water in the water inlet chamber, it flows through the check valve to the pressurizing chamber again, realizing the complete internal circulation of the internally leaked water. The internally leaked water circulates internally among the high-pressure chamber, reflux chamber A, reflux channel, reflux chamber B, and water inlet chamber, avoiding external leakage. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0019] Figure 1 is a schematic structural diagram of a preferred embodiment of the anti-leakage internal circulation plunger pump of the present invention;

[0020] Figure 2 is Figure 1 a partial structural diagram;

[0021] Figure 3 is a three-dimensional structural diagram of the low-pressure water seal;

[0022] Figure 4 is Figure 3 a sectional view;

[0023] Figure 5 is a three-dimensional structural diagram of the check valve;

[0024] Figure 6 is Figure 5 a sectional view;

[0025] The markings of each component in the attached drawings are as follows: 1. pump cover, 11. water outlet, 12. water outlet cavity, 13. check valve for water outlet, 14. pressurizing cavity, 15. water inlet cavity, 151. lower water inlet cavity, 152. upper water inlet cavity, 16. return passage, 2. pump body, 21. water inlet, 3. check valve, 31. return hole, 4. sealing assembly, 41. high-pressure water seal, 42. low-pressure water seal, 421. diversion hole, 43. sealing pressure ring, 5. plunger, return cavity A, return cavity B. Specific embodiments

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope that can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope that the present invention can be implemented.

[0027] Please refer to Figures 1 to 6 , an anti-leakage internal circulation type plunger pump, including a pump body 2 and a pump cover 1. A plunger 5 is provided in the pump body 2. A water outlet 11 and a water outlet cavity 12 are provided on the pump cover 1. A check valve for water outlet 13 is provided in the water outlet 11. A water inlet 21 is provided on the pump body 2. A pressurizing cavity 14 corresponding to the plunger 5 is provided in the pump body 2. An inlet cavity 15 is formed by connecting the pump body 2 and the pump cover 1. The inlet cavity 15, the pressurizing cavity 14, and the water outlet cavity 12 are connected in sequence. A check valve 3 is provided in the inlet cavity 15. The water entering through the water inlet 21 enters the pressurizing cavity 14 after passing through the check valve 3. A return passage 16 is provided on the pump cover 1, and the return passage 16 connects the pressurizing cavity 14 and the inlet cavity 15. Water from the water source enters the inlet cavity 15 through the water inlet 21. The check valve 3 in the inlet cavity 15 opens, and the check valve for water outlet 13 closes. The water enters the pressurizing cavity 14 from the inlet cavity 15 after passing through the check valve 3. The plunger 5 moves to pressurize the water in the pressurizing cavity 14. The check valve 3 closes, and the check valve for water outlet 13 opens. The pressurized water is discharged through the water outlet cavity 12 and the water outlet 11. The principle of the plunger pump spraying high-pressure water is similar to that of the existing plunger pump. The plunger adopts an inclined disk type plunger structure, and other existing plunger structures can also be used.

[0028] There is a sealing assembly 4 in the pressurizing chamber 14 that is in dynamic sealing cooperation with the plunger. The sealing assembly 4 includes a high-pressure water seal 41 and a low-pressure water seal 42 disposed in the pressurizing chamber 14. The high-pressure water seal 41 and the low-pressure water seal 42 are sleeved on the plunger 5. The internal leakage between the plunger 5 and the high-pressure water seal 41 allows the water in the pressurizing chamber 14 to enter the return chamber through the low-pressure water seal 42. There is a diversion hole 421 on the low-pressure water seal 42, and the diversion hole 421 is located at the upper end of the low-pressure water seal 42. Figure 3 and 4 In Figure 3 and 4 , the number of the diversion holes 421 is 1, which is arranged on the circular ring part of the middle protrusion of the low-pressure water seal 42. There is a gap between the circular ring part and the pressurizing chamber 14 to facilitate the leakage water to pass through. The gap between the low-pressure water seal 42 and the pressurizing chamber 14 forms a return chamber A, and the diversion hole 421 is connected to the return chamber A. The lower end of the low-pressure water seal 42 is installed in the pump body 2 and is in sealed connection with the pump body 2, the pump cover 1, and the plunger 5. The upper end extends into the pressurizing chamber 14. A sealing pressure ring 43 is also installed inside the lower end of the low-pressure water seal 42. The sealing pressure ring 43 is in sealed connection with the plunger 5, and the sealing pressure ring 43 is located in the pump body 2. The outside of the low-pressure water seal 42 is sealed with the bottom surface of the pump cover 1 by embedding an O-ring to ensure the internal sealing effect.

[0029] The high-pressure water seal 41, the low-pressure water seal 42, and the sealing pressure ring 43 are all in dynamic sealing connection with the plunger 5. During the reciprocating movement of the plunger 5, the high-pressure water seal 41 will be worn due to the high pressure of the water. The wear occurs on the contact surface between the high-pressure water seal 41 and the plunger 5, that is, the inner hole of the high-pressure water seal 41 is the worn part. At this time, the water in the pressurizing chamber 14 will leak downward along the plunger 5 through the worn part. After the water leaks downward, due to the effect of the sealing pressure ring 43, the leakage water will accumulate between the low-pressure water seal 42 and the sealing pressure ring 43 and will not leak out. As the leakage water increases, the leakage water between the low-pressure water seal 42 and the sealing pressure ring 43 will enter the return chamber A along the diversion hole 421, and the water in the return chamber A will enter the return passage 16. Through the above structure, it is effectively ensured that the internally leaked water will not overflow to the outside of the pump body 2, and it is ensured that the internally leaked water is always inside the pump body 2.

[0030] The water inlet cavity 15 includes a lower water inlet cavity 151 formed on the pump body 2 and an upper water inlet cavity 152 formed on the pump cover 1. The pump body 2 and the pump cover 1 are connected to communicate the upper water inlet cavity 152 and the lower water inlet cavity 151 to form the water inlet cavity 15. The lower water inlet cavity 151 is communicated with the water inlet 21, and the upper water inlet cavity 152 is communicated with the pressurizing cavity 14. The check valve 3 is installed in the upper water inlet cavity 152. The gap between the check valve 3 and the upper water inlet cavity 152 forms a return cavity B. The lower end of the check valve 3 is hermetically connected between the cylinder block and the cylinder head. Sealing rings are also embedded at the contact parts between the lower end of the one-way valve and the pump body 2 and the pump cover 1. Combined with the sealing rings on the low-pressure water seal 42, it ensures that the water source inside the water inlet cavity 15 will not leak through between the pump body and the pump cover 1. The water inlet cavity 15 is divided into a split structure of a lower water inlet cavity 151 and an upper water inlet cavity 152. After the pump body 2 and the pump cover 1 are assembled, the complete water inlet cavity 15 is formed by the lower water inlet cavity 151 and the upper water inlet cavity 152. After the water inlet 21 is filled with water, the water first flows into the lower water inlet cavity 151, and then enters the inside of the check valve 3 through the valve port at the lower end of the check valve 3. At the same time, the check valve 3 opens, and the water flows from the check valve 3 to the upper water inlet cavity 152 and then enters the pressurizing cavity 14. The positions and structures of the water inlet cavity 15 and the check valve 3 are readjusted. This structural adjustment can make the volumes of the pump body 2 and the pump cover 1 smaller. The check valve 3 not only undertakes the function of water inlet but also plays a role in the circulation of the internally leaked water.

[0031] The return cavity A and the return cavity B are communicated through a return channel 16. The check valve 3 is provided with a return hole 31, and a valve port communicated with the water inlet 21 is opened at the lower end. The return cavity B is communicated with the return hole 31. The water in the return cavity B enters the check valve 3 through the return hole 31 and then merges with the water at the water inlet 21 and flows to the pressurizing cavity 14 through the check valve 3. The return holes 31 are arranged at equal intervals along the circumferential direction of the surface of the check valve 3, and the return holes 31 are above the valve port of the check valve 3. Figure 5 and 6 In [reference], the number of the return holes 31 is 3. There is a gap between the return holes 31 and the pump cover 1. The number of the return holes 31 provided can be adjusted and is not limited to the number shown in the figure. When the leaked water enters the return cavity B through the return channel 16, the water in the return cavity B gradually increases. The water in the return cavity B will enter the check valve 3 through the return holes 31, merge with the water in the water inlet cavity 15, and flow to the pressurizing cavity 14 together during the next water inlet of the plunger pump, ensuring that the water leaked inside the plunger pump always circulates and will not leak outside the pump body 2. The regional components such as the spring in the check valve 3 adopt the conventional check valve structure, which is a conventional choice in the art.

[0032] Different from the prior art, the anti-external-leakage internal-circulation plunger pump of the present invention can, after the sealing structure on the plunger leaks due to high pressure, return the leaked water to the water inlet cavity through the internal flow channel, avoid the water from leaking outside the pump body, and will not affect the normal use of the plunger pump.

[0033] The above has schematically described the present invention and its embodiments. This description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. An anti-leakage internal circulation type plunger pump, comprising a pump body and a pump cover. A plunger is arranged inside the pump body, and a water outlet and a water outlet cavity are arranged on the pump cover. A check valve is arranged inside the water outlet, and a water inlet is arranged on the pump body. A pressurizing cavity corresponding to the plunger is arranged inside the pump body, and it is characterized in that, A water inlet cavity is formed by connecting the pump body and the pump cover. The water inlet cavity, the pressurizing cavity and the water outlet cavity are communicated in sequence. A check valve is arranged in the water inlet cavity. Water entering from the water inlet enters the pressurizing cavity after passing through the check valve. A return channel is arranged on the pump cover, and the return channel communicates the pressurizing cavity and the water inlet cavity. A sealing component that is in dynamic seal cooperation with the plunger is arranged in the pressurizing cavity. Water leaking between the pressurizing cavity and the sealing component flows along the sealing component, passes through the check valve from the return channel and then returns to the pressurizing cavity. A return cavity A is formed between the pressurizing cavity and the sealing component, and a return cavity B is formed between the check valve and the water inlet cavity. The return cavity A and the return cavity B are communicated through the return channel. The check valve is provided with a return hole, and a valve port communicating with the water inlet is opened at the lower end. The return cavity B is communicated with the return hole. Water in the return cavity B enters the check valve through the return hole, is combined with the water at the water inlet, and then flows through the check valve to the pressurizing cavity. The return holes are arranged at equal intervals along the circumferential direction of the surface of the check valve, and the return holes are above the valve port of the check valve. The sealing component includes a high-pressure water seal and a low-pressure water seal arranged in the pressurizing cavity. The high-pressure water seal and the low-pressure water seal are sleeved on the plunger. Internal leakage between the plunger and the high-pressure water seal causes water in the pressurizing cavity to enter the return cavity through the low-pressure water seal.

2. The anti-leakage internal circulation plunger pump according to claim 1, characterized in that, The low-pressure water seal is provided with a diversion hole. A gap between the low-pressure water seal and the pressurizing cavity forms the return cavity A, and the diversion hole is communicated with the return cavity A.

3. The anti-leakage internal circulation plunger pump according to claim 2, wherein The lower end of the low-pressure water seal is installed in the pump body and is hermetically connected between the pump body, the pump cover and the plunger. The upper end extends into the pressurizing cavity, and the diversion hole is located at the upper end of the low-pressure water seal.

4. The anti-leakage internal circulation type plunger pump according to claim 3, wherein A sealing pressure ring is further installed inside the lower end of the low-pressure water seal. The sealing pressure ring is hermetically connected with the plunger, and the sealing pressure ring is located in the pump body.

5. The anti-leakage internal circulation type plunger pump according to any one of claims 1-4, characterized in that, The water inlet cavity includes a lower water inlet cavity opened on the pump body and an upper water inlet cavity opened on the pump cover. The pump body and the pump cover are connected so that the upper water inlet cavity and the lower water inlet cavity are communicated to form the water inlet cavity. The lower water inlet cavity is communicated with the water inlet, and the upper water inlet cavity is communicated with the pressurizing cavity.

6. The anti-leakage internal circulation type plunger pump according to claim 5, wherein The check valve is installed in the upper water inlet cavity. A gap between the check valve and the upper water inlet cavity forms the return cavity B. The lower end of the check valve is hermetically connected between the cylinder block and the cylinder head.

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