Pump cover device for cleaning machine, plunger pump and cleaning machine

Abstract

The utility model relates to the technical field of cleaning machines, and discloses a pump cover device for a cleaning machine. Comprising an overflow valve assembly, a one-way valve assembly, an overflow channel, a first liquid channel, a first pressure relief channel, a pump cover inlet used for being connected with a pump body of the plunger pump, a pump cover outlet used for being connected with a spray gun and a second liquid channel communicated with the pump cover outlet. The overflow channel, the first liquid channel and the first pressure relief channel are all connected into the overflow valve assembly, one end of the one-way valve assembly is connected with the second liquid channel, the other end of the one-way valve assembly is connected with the overflow channel and the first liquid channel, and the one-way valve assembly comprises a second pressure relief channel. And the first liquid channel is communicated with the pump cover inlet. According to the device, the burden of high-pressure liquid on the pump cover is reduced through secondary pressure relief, the service life of the pump cover device is prolonged, and the use safety is improved. The utility model further discloses a plunger pump and a cleaning machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cleaning machines, in particular to a pump cover device for a cleaning machine, a plunger pump and a cleaning machine. BACKGROUND

[0002] A high-pressure cleaning machine is used to clean the surface of an object by means of a power device to generate high-pressure water in a high-pressure plunger pump. When the impact force of water is greater than the adhesion of dirt to the surface of the object, the high-pressure water will strip and flush away the dirt, achieving the effect of cleaning the surface of the object. Some cleaning machines on the market still run when the gun is turned off, resulting in waste of energy. Some cleaning machines can turn off the gun and stop running only once, but the liquid in some water passages inside the plunger pump is still in a high-pressure state, which can easily cause the cleaning machine to malfunction, reduce the service life of the plunger pump, and even cause the high-pressure gun to burst, endangering the personal safety of the user. CONTENT OF THE UTILITY MODEL

[0003] To solve the above problems, the utility model provides a pump cover device for a cleaning machine, a plunger pump and a cleaning machine.

[0004] The utility model provides a pump cover device for a cleaning machine, which comprises an overflow valve assembly, a one-way valve assembly, an overflow channel, a first liquid channel, a first pressure relief channel, a pump cover inlet for connecting with the pump body of a plunger pump, a pump cover outlet for connecting with a spray gun and a second liquid channel in communication with the pump cover outlet, wherein the overflow channel, the first liquid channel and the first pressure relief channel are connected to the overflow valve assembly, one end of the one-way valve assembly is connected to the second liquid channel, and the other end is connected to the overflow channel and the first liquid channel respectively, the one-way valve assembly comprises a second pressure relief channel, and the first liquid channel is in communication with the pump cover inlet.

[0005] When the spray gun is turned off, the overflow valve assembly is used to connect the first liquid channel and the first pressure relief channel to complete one-time pressure relief, and the one-way valve assembly is used to open the second pressure relief channel to make the overflow channel and the second liquid channel in communication with the first liquid channel to complete two-time pressure relief.

[0006] In an embodiment, the pump cover device further comprises a switch for controlling the power supply of the cleaning machine, one end of the overflow valve assembly is connected to the overflow channel, and the other end is connected to the switch.

[0007] In an embodiment, the overflow valve assembly comprises a first valve rod, a valve sleeve and a first elastic member, one end of the first valve rod is sleeved with the valve sleeve, the other end is connected to the switch, the first elastic member is arranged on the first valve rod, a first sealing part is arranged on the first valve rod, and the first sealing part is in abutment with the valve sleeve.

[0008] In an embodiment, the overflow valve assembly further comprises a first sealing member arranged at both ends of the first valve rod respectively, a first sealing portion arranged in the middle of the first valve rod and abutting against the valve sleeve, and a first elastic member arranged in the first valve rod and abutting against the inner wall of the fastener.

[0009] In an embodiment, the overflow valve assembly further comprises a fastener arranged at one end of the first valve rod close to the switch member and fixing the valve sleeve, and a first elastic member arranged in the first valve rod and abutting against the inner wall of the fastener.

[0010] In an embodiment, the one-way valve assembly comprises a one-way valve, a second valve rod, a limiting member arranged in the one-way valve close to one end of the second liquid channel, a second valve rod arranged in the one-way valve and connected with the limiting member, and a second elastic member arranged in the second valve rod and abutting against the inner wall of the one-way valve, and a second pressure relief channel penetrating through the one-way valve.

[0011] In an embodiment, the one-way valve assembly further comprises a second sealing member arranged between the second valve rod and the limiting member.

[0012] In an embodiment, the one-way valve is provided with a second sealing portion at one end close to the first liquid channel, the second sealing portion is of an outer hexagonal structure, and the connection between the second sealing portion and the first liquid channel is provided with a tapered inclined surface.

[0013] Another aspect of the embodiments of the present application further provides a plunger pump comprising a pump body and the pump cover device provided by the foregoing embodiments, and the pump body is connected with the pump cover inlet.

[0014] Another aspect of the embodiments of the present application further provides a cleaning machine comprising a spray gun and the plunger pump provided by the foregoing embodiments, and the spray gun is connected with the pump cover outlet.

[0015] The beneficial effects of the present application are as follows: the overflow valve assembly is connected with the first liquid channel and the first pressure relief channel to realize first pressure relief, the second pressure relief channel of the one-way valve assembly is connected to realize second pressure relief, the liquid pressure in the pump cover device can be further reduced, the burden of the pump cover device caused by high-pressure liquid can be reduced, the service life of the pump cover device can be prolonged, the safety risk caused by the explosion of the spray gun due to high-pressure liquid can be avoided, and the use safety of the user and the stability of the pump cover device can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic cross-sectional view of the pump cover device according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A cross-sectional view of the overflow valve assembly at point A with the spray gun in the open state.

[0019] Figure 3 for Figure 1 A cross-sectional view of the overflow valve assembly at point A with the spray gun closed.

[0020] Figure 4 for Figure 1 A cross-sectional view of the one-way valve assembly at point B with the spray gun in the open state.

[0021] Figure 5 for Figure 1 A cross-sectional view of the one-way valve assembly at point B with the spray gun closed. Detailed Implementation

[0022] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. Based on the description of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] The terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, and are merely for the convenience of description and simplification of the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0025] The terms "first", "second", "third" and the like merely distinguish similar attributes, and do not indicate or imply relative importance or a particular order.

[0026] The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to the listed elements, other elements not explicitly listed can also be included.

[0027] Please refer to Figures 1-5 , which shows a pump cover device for a cleaning machine provided in the embodiment of the utility model, comprising: an overflow valve assembly 1, a one-way valve assembly 2, an overflow channel 3, a first liquid channel 4, a first pressure relief channel 5, a pump cover inlet (not shown in the figure) for connecting with the pump body of the plunger pump, a pump cover outlet 6 for connecting with the spray gun, and a second liquid channel 7 communicating with the pump cover outlet 6, the overflow channel 3, the first liquid channel 4 and the first pressure relief channel 5 are all connected to the overflow valve assembly 1, one end of the one-way valve assembly 2 is connected with the second liquid channel 7, and the other end is respectively connected with the overflow channel 3 and the first liquid channel 4, the one-way valve assembly 2 comprises a second pressure relief channel 212, and the first liquid channel 4 communicates with the pump cover inlet;

[0028] When the spray gun is closed, the overflow valve assembly 1 is used to communicate the first liquid channel 4 and the first pressure relief channel 5, to complete a pressure relief, and the one-way valve assembly 2 is used to open the second pressure relief channel 212 to make the overflow channel 3 and the second liquid channel 7 communicate with the first liquid channel 4, to complete a secondary pressure relief.

[0029] As shown in Figures 1-5 , in the embodiment, when the spray gun is opened, the overflow valve assembly 1 disconnects the first liquid channel 4 and the first pressure relief channel 5, the one-way valve assembly 2 is opened and the second pressure relief channel 212 is closed, the first liquid channel 4 communicates with the overflow channel 3 and the second liquid channel 7, and the liquid passes through the pump cover inlet (not shown in the figure), the first liquid channel 4, the overflow channel 3, the second liquid channel 7 and the pump cover outlet 6 in turn and is sprayed out after entering the spray gun;

[0030] When the spray gun is closed, the one-way valve assembly 2 is closed, the first liquid channel 4 is disconnected from the overflow channel 3 and the second liquid channel 7, the overflow valve assembly 1 connects the first liquid channel 4 and the first pressure relief channel 5, liquid flows from the first liquid channel 4 into the first pressure relief channel 5, completing the first pressure relief; the liquid in the overflow channel 3 and the second liquid channel 7 is still in a high-pressure state, so that the one-way valve assembly 2 opens the second pressure relief channel 212, and at the same time the overflow channel 3 and the second liquid channel 7 are connected to the first liquid channel 4 through the second pressure relief channel 212, liquid flows from the overflow channel 3, the second liquid channel 7, the second pressure relief channel 212 and the first liquid channel 4 into the first pressure relief channel 5 in turn, completing the second pressure relief.

[0031] The first pressure relief is achieved by connecting the first liquid channel 4 and the first pressure relief channel 5 through the overflow valve assembly 1, and the second pressure relief is achieved through the second pressure relief channel 212 of the one-way valve assembly 2, which can further reduce the liquid pressure inside the pump cover device, reduce the burden of high-pressure liquid on the pump cover device, prolong the service life of the pump cover device, avoid the safety risk caused by the explosion of the spray gun due to high-pressure liquid, and improve the safety of the user and the stability of the pump cover device.

[0032] In an embodiment, the pump cover device further comprises a switch piece 8 for controlling the power supply of the cleaning machine, one end of the overflow valve assembly 1 is connected with the overflow channel 3, and the other end is connected with the switch piece 8.

[0033] As shown in Figures 1-3 In this embodiment, the overflow valve assembly 1 controls the opening and closing of the switch piece 8.

[0034] When the spray gun is opened, the overflow valve assembly 1 disconnects the first liquid channel 4 and the first pressure relief channel 5, and opens the switch piece 8, so that the power supply of the cleaning machine is powered on and the cleaning machine operates normally.

[0035] When the spray gun is closed, the overflow valve assembly 1 connects the first liquid channel 4 and the first pressure relief channel 5, and the overflow valve assembly 1 closes the switch piece 8, so that the power supply of the cleaning machine is powered off, liquid flows from the first liquid channel 4 into the first pressure relief channel 5, completing the first pressure relief; the liquid in the overflow channel 3 and the second liquid channel 7 is still in a high-pressure state, so that the one-way valve assembly 2 opens the second pressure relief channel 212, and at the same time the overflow channel 3 and the second liquid channel 7 are connected to the first liquid channel 4 through the second pressure relief channel 212, liquid flows from the overflow channel 3, the second liquid channel 7, the second pressure relief channel 212 and the first liquid channel 4 into the first pressure relief channel 5 in turn, completing the second pressure relief, and the overflow valve assembly 1 is still in the state of closing the switch piece 8, realizing the second pressure relief function of gun-off shutdown. Not only saves energy, but also improves the safety and stability of the pump cover device.

[0036] In one embodiment, the overflow valve assembly 1 includes a first valve stem 11, a valve sleeve 12, and a first elastic member 14. One end of the first valve stem 11 is fitted with the valve sleeve 12, and the other end is connected to the switch member 8. The first elastic member 14 passes through the first valve stem 11. The first valve stem 11 is provided with a first sealing part 111, and the first sealing part 111 abuts against the valve sleeve 12.

[0037] like Figures 1-3 As shown, in this embodiment, when the spray gun is turned on, the first sealing part 111 abuts against the valve sleeve 12 through the first elastic element 14, thereby disconnecting the first liquid channel 4 and the first pressure relief channel 5, and the switch 8 is in the open state, allowing the cleaning machine to operate normally. When the spray gun is turned off, the liquid in the overflow channel 3 and the second liquid channel 7 is under high pressure, thereby pushing the first valve stem 11 to move relative to the switch 8. The first sealing part 111 gradually disengages from the valve sleeve 12, and the first elastic element 14 sleeved on the first valve stem 11 is compressed, connecting the first liquid channel 4 and the first pressure relief channel 5, achieving the first pressure relief. At the same time, the first valve stem 11 closes the switch 8, disconnecting the power supply to the cleaning machine and stopping its operation. The degree of the first pressure relief can be controlled by the first elastic element 14. When the elastic force and the liquid pressure are balanced, the first pressure relief is completed, and the liquid pressure in the first liquid channel 4 and the first pressure relief channel 5 is in a balanced state.

[0038] In one embodiment, the overflow valve assembly 1 further includes a first sealing element 13, which is respectively disposed at both ends of the first valve stem 11, a first sealing part 111 is disposed in the middle of the first valve stem 11 and has a conical structure that abuts against the valve sleeve 12, and a first elastic element 14 passes through the end of the first valve stem 11 near the switch element 8.

[0039] like Figures 1-3 As shown, in this embodiment, the first sealing part 111 is located in the middle of the first valve stem 11 and has a conical structure that abuts against one end of the valve sleeve 12, which helps to improve the overall sealing performance.

[0040] In one embodiment, the overflow valve assembly 1 further includes a fastener 15, which is disposed at one end of the first valve stem 11 near the switch member 8 and fixes the valve sleeve 12. The first elastic member 14 passes through the first valve stem 11 and abuts against the inner wall of the fastener 15.

[0041] like Figures 1-3As shown, in this embodiment, the first sealing element 13 is respectively disposed at both ends of the first valve stem 11. One end of the first valve stem 11 passes through the valve sleeve 12 and is connected to the overflow channel 3, and a first sealing element 13 is provided between it and the valve sleeve 12. The first sealing element 13 separates the high-pressure liquid in the overflow channel 3 from the low-pressure liquid in the overflow valve assembly 1, and the resulting hydraulic difference helps to push the first valve stem 11 to move relative to the switch element 8. The other end of the first valve stem 11 passes through the fastener 15 and is connected to the switch element 8, and another first sealing element 13 is provided between it and the fastener 15. The first sealing element 13 separates the liquid in the overflow valve assembly 1 from the switch element 8, preventing liquid from entering and causing the switch element 8 to fail. The first elastic element 14 passes through the first valve stem 11, and one end of the first elastic element 14 abuts against the first sealing part 111, and the other end abuts against the inner wall of the fastener 15. The inner wall of the fastener 15 provides support for the first elastic element 14, better limiting the compression stroke, and further controlling the degree of pressure relief.

[0042] In one embodiment, the one-way valve assembly 2 includes a one-way valve 21, a second valve stem 22, a limiting member 23, and a second elastic member 25. The limiting member 23 is disposed inside the one-way valve 21 near the end of the second liquid channel 7. The second valve stem 22 is disposed inside the one-way valve 21 and connected to the limiting member 23. The second elastic member 25 is sleeved on the second valve stem 22 and abuts against the inner wall of the one-way valve 21. The second pressure relief channel 212 penetrates the one-way valve 21.

[0043] like Figures 4-5 As shown, in this embodiment, when the spray gun is turned on, the second valve stem 22 abuts against the limiting member 23 under the action of the second elastic member 25, closing the second pressure relief channel 212 and opening the one-way valve 21. The liquid flows to the overflow channel 3, the second liquid channel 7, and the pump cover outlet 6, and then enters the spray gun and is sprayed out. When the spray gun is turned off, the one-way valve 21 closes, the first liquid channel 4 is disconnected from the overflow channel 3 and the second liquid channel 7, and the overflow valve assembly 1 connects the first liquid channel 4 and the first pressure relief channel 5. The liquid flows from the first liquid channel 4 into the first pressure relief channel 5, completing one pressure relief. The liquid in the overflow channel 3 and the second liquid channel 7 is still under high pressure, causing the second valve stem 22 to gradually disengage. The second pressure relief channel 212 opens and the overflow channel 3 and the second liquid channel 7 are connected to the first liquid channel 4 through the second pressure relief channel 212. Liquid flows into the first pressure relief channel 5 in sequence from the overflow channel 3, the second liquid channel 7, the second pressure relief channel 212 and the first liquid channel 4, completing the secondary pressure relief. After the secondary pressure relief is completed, the second elastic element 25 pushes the second valve stem 22 to abut against the limit element 23 and closes the second pressure relief channel 212. At this time, the liquid pressure in the pump cover device is in a balanced state. The residual liquid pressure still keeps the switch element 8 in the open state, achieving the effect of both completing the secondary pressure relief and stopping the machine.

[0044] The degree of the second pressure relief can be controlled by the second elastic element 25, so that the liquid pressure in the pump cover device reaches a new balance, further improving the stability and safety of the pump cover device.

[0045] In one embodiment, the one-way valve assembly 2 further includes a second seal 24 disposed between the second valve stem 22 and the limiting member 23.

[0046] like Figures 4-5 As shown, in this embodiment, the high-pressure liquid in the second liquid channel 7 is separated from the low-pressure liquid in the second pressure relief channel 212 by the second seal 24, and the resulting hydraulic difference is more conducive to pushing the second valve stem 22 to move.

[0047] In one embodiment, the one-way valve 21 is provided with a second sealing part 211 at one end near the first liquid channel 4. The second sealing part 211 has an external hexagonal structure, and a tapered inclined surface is provided at the connection between the second sealing part 211 and the first liquid channel 4.

[0048] like Figures 4-5 As shown, in this embodiment, when the spray gun is opened, the second sealing part 211 forms a gap with the first liquid channel 4, which facilitates the flow of liquid into the second liquid channel 7 and the overflow channel 3; when the spray gun is closed, the second sealing part 211 is connected to and sealed with the first liquid channel 4. The sealing effect is better because the second sealing part 211 has an external hexagonal structure and a conical inclined surface.

[0049] Another embodiment of this application provides a plunger pump, including a pump body and a pump cover device provided in the foregoing embodiments, wherein the pump body is connected to the pump cover inlet.

[0050] The plunger pump in this embodiment uses the pump cover device provided in the aforementioned embodiments, which improves user safety and stability through secondary pressure relief and extends the service life of the plunger pump.

[0051] Another embodiment of this application also provides a cleaning machine, including a spray gun and a plunger pump provided in the foregoing embodiments, wherein the spray gun is connected to the pump cover outlet 6.

[0052] The cleaning machine in this embodiment uses the plunger pump provided in the aforementioned embodiments to achieve a second pressure relief, which can further reduce the liquid pressure inside the plunger pump, reduce the burden of high-pressure liquid on the plunger pump and spray gun, extend the service life of the plunger pump, avoid the safety risk caused by the spray gun exploding due to high-pressure liquid, and improve the user's safety and the stability of the cleaning machine.

[0053] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A pump cover device for a cleaning machine, characterized in that, The pump cover device comprises an overflow valve assembly (1), a one-way valve assembly (2), an overflow channel (3), a first liquid channel (4), a first pressure relief channel (5), a pump cover inlet for connecting with a pump body of a plunger pump, a pump cover outlet (6) for connecting with a spray gun, and a second liquid channel (7) in communication with the pump cover outlet (6), the overflow channel (3), the first liquid channel (4), and the first pressure relief channel (5) are connected to the overflow valve assembly (1), one end of the one-way valve assembly (2) is connected to the second liquid channel (7), and the other end is connected to the overflow channel (3) and the first liquid channel (4) respectively, the one-way valve assembly (2) comprises a second pressure relief channel (212), and the first liquid channel (4) is in communication with the pump cover inlet. When the spray gun is closed, the overflow valve assembly (1) is used to communicate the first liquid channel (4) and the first pressure relief channel (5) to complete a pressure relief, and the one-way valve assembly (2) is used to open the second pressure relief channel (212) to make the overflow channel (3) and the second liquid channel (7) in communication with the first liquid channel (4) to complete a secondary pressure relief. The pump cover device further comprises a switch piece (8) for controlling the power supply of the cleaning machine, one end of the overflow valve assembly (1) is connected to the overflow channel (3), and the other end is connected to the switch piece (8).

2. The pump cover arrangement of claim 1, wherein The overflow valve assembly (1) comprises a first valve rod (11), a valve sleeve (12), and a first elastic piece (14), one end of the first valve rod (11) is sleeved with the valve sleeve (12), the other end is connected to the switch piece (8), the first elastic piece (14) is arranged on the first valve rod (11), the first valve rod (11) is provided with a first sealing portion (111), and the first sealing portion (111) is in abutment with the valve sleeve (12).

3. The pump cover arrangement of claim 2, wherein The overflow valve assembly (1) further comprises a first sealing piece (13), the first sealing piece (13) is arranged at both ends of the first valve rod (11), the first sealing portion (111) is arranged in the middle of the first valve rod (11) and is in abutment with the valve sleeve (12), and the first elastic piece (14) is arranged on one end of the first valve rod (11) close to the switch piece (8).

4. The pump cover arrangement of claim 3, wherein The overflow valve assembly (1) further comprises a fastener (15), the fastener (15) is arranged at one end of the first valve rod (11) close to the switch piece (8) and fixes the valve sleeve (12), and the first elastic piece (14) is arranged on the first valve rod (11) and abuts against the inner wall of the fastener (15).

5. The pump cover arrangement of claim 4, wherein, ​ 6. The pump cover arrangement of claim 2, wherein The one-way valve assembly (2) comprises a one-way valve (21), a second valve rod (22), a limiting piece (23), and a second elastic piece (25), the limiting piece (23) is arranged inside the one-way valve (21) near one end of the second liquid channel (7), the second valve rod (22) is arranged in the one-way valve (21) and connected with the limiting piece (23), the second elastic piece (25) is sleeved on the second valve rod (22) and abuts against the inner wall of the one-way valve (21), and the second pressure relief channel (212) penetrates the one-way valve (21).

7. The pump cover arrangement of claim 6, wherein The one-way valve assembly (2) further comprises a second sealing piece (24), which is arranged between the second valve rod (22) and the limiting piece (23).

8. The pump cover arrangement of claim 7, wherein, The one-way valve (21) is provided with a second sealing part (211) near one end of the first liquid channel (4), the second sealing part (211) is of an outer hexagonal structure, and a tapered inclined surface is arranged at the connection between the second sealing part (211) and the first liquid channel (4).

9. A piston pump characterized in that The pump comprises a pump body and the pump cover device according to any one of claims 1 to 8, and the pump body is connected with the pump cover inlet.

10. A cleaning machine characterized by, The plunger pump comprises a spray gun and the plunger pump according to claim 9, and the spray gun is connected with the pump cover outlet (6).

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