Quick-release plunger pump with backflow function

Abstract

The utility model discloses a kind of quick-release type plunger pumps with backflow function, including power end, pump body, sealing sleeve group, water inlet valve group, water outlet valve group and pressing plate;The pump body both ends opening is provided, and linear cavity structure for containing sealing sleeve, water inlet valve group and water outlet valve group is arranged in the pump body, the power end and pressing plate are respectively arranged in the both ends of pump body, and the movable end on the pump body is provided with backflow component for medium backflow;The structure mode of the present scheme can greatly shorten assembly dismounting length, simplify assembly process, reduce assembly threshold, and non-professional person can also easily and quickly complete assembly dismounting, greatly improve assembly dismounting efficiency, and each backflow structure is provided in the present scheme, and the medium at original leakage place can be backflowed.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure plunger reciprocating pump technology, and in particular to a quick-release plunger pump with reflux function. Background Technology

[0002] Plunger reciprocating pumps, as a common liquid transfer device, are widely used in petrochemical, water treatment, and food processing industries. Their core working principle relies on the reciprocating motion of the plunger, changing the volume of the pump chamber to achieve liquid intake and discharge. During the operation of the reciprocating pump, a gap exists between the plunger and the sealing surface. The medium flows out through this gap, and as the operating time increases, this gap widens, leading to greater leakage. Handling leaked media is a common problem for plunger reciprocating pump manufacturers. Traditional plunger reciprocating pumps use direct external discharge or pipeline collection methods. These methods affect the aesthetics of the equipment, reduce pump output flow, waste the leaked medium, and may also cause external pollution.

[0003] Meanwhile, the hydraulic end structure of traditional plunger reciprocating pumps is relatively complex, and disassembly and assembly are inconvenient and time-consuming, requiring professional personnel to complete the process. Because the components are scattered and not modularized, it is easy to confuse them or not understand their assembly locations during assembly, making the assembly process quite complex. Utility Model Content

[0004] The purpose of this utility model is to provide a quick-release plunger pump with reflux function to address the above-mentioned shortcomings, thereby solving the leakage problem between the plunger and the sealing pair in the prior art. At the same time, it also solves the problems that the hydraulic end structure of traditional plunger reciprocating pumps is relatively complex, disassembly and assembly are inconvenient, maintenance takes a long time, and disassembly and assembly require professional personnel.

[0005] This utility model is achieved through the following solution:

[0006] A quick-release plunger pump with reflux function includes a power end, a pump body, a sealing sleeve assembly, an inlet valve assembly, an outlet valve assembly, and a pressure plate. The pump body has openings at both ends, and the pump body has a linear cavity structure inside for accommodating the sealing sleeve, the inlet valve assembly, and the outlet valve assembly. The power end and the pressure plate are respectively located at both ends of the pump body, and a reflux assembly for medium reflux is provided at the movable end of the pump body.

[0007] Based on the above-mentioned structure of a quick-release plunger pump with reflux function, the linear cavity structure includes a sealing cavity, an inlet valve cavity, and an outlet valve cavity; the sealing sleeve is disposed in the sealing cavity, the water inlet valve assembly is disposed in the inlet valve cavity, and the water outlet valve assembly is disposed in the outlet valve cavity; the size of the inlet valve cavity is not smaller than the size of the sealing cavity, and the reflux assembly is disposed between the sealing sleeve and the inlet valve cavity.

[0008] Based on the structure of the quick-release plunger pump with reflux function described above, the sealing assembly includes a plunger, a sealing element, and a sealing sleeve. The sealing sleeve is disposed in a sealing cavity, and a first cavity that mates with the sealing element is provided inside the sealing sleeve. A first through hole that mates with the plunger is provided at the end of the sealing sleeve. The sealing element is disposed in the first cavity, and a second through hole that mates with the plunger is provided in the sealing element. The plunger passes through the first through hole and the second through hole. A support sleeve is provided in the radial direction of the plunger, and the support sleeve contacts the sealing element. The power end is connected to the end of the plunger away from the inlet valve assembly.

[0009] Based on the structure of the quick-release plunger pump with reflux function described above, the sealing sleeve extends into the inlet valve cavity to cooperate with the water inlet valve assembly; a first sealing ring is provided on the contact portion between the sealing sleeve and the sealing cavity; a second sealing ring is provided on the contact portion between the support sleeve and the plunger; and a third sealing ring is provided on the contact portion between the support sleeve and the first cavity.

[0010] Based on the structure of the quick-release plunger pump with reflux function described above, the reflux assembly includes a first reflux channel, a second reflux channel, and a check valve; the first reflux channel is disposed on the support sleeve near the end of the seal; the second reflux channel is disposed along the radial and axial directions of the seal sleeve and penetrates the inlet valve chamber; the check valve is disposed at the end of the second reflux channel.

[0011] Based on the structure of the quick-release plunger pump with reflux function described above, the first reflux channel includes a first circulation hole, a second circulation hole, and a connecting guide hole. The first circulation hole is disposed on the contact surface between the support sleeve and the plunger, and the second circulation hole is disposed on the contact surface between the support sleeve and the first cavity. The connecting guide hole is respectively connected to the first circulation hole and the second circulation hole, and at least one connecting guide hole is provided between the first circulation hole and the second circulation hole. The second circulation hole is connected to the second reflux channel.

[0012] Based on the structure of the quick-release plunger pump with reflux function described above, the second reflux channel includes a radial guide hole and an axial guide hole; the axial guide hole is arranged perpendicular to the radial guide hole, and the one-way valve is arranged at the end of the axial guide hole away from the radial guide hole; the axial guide hole is arranged at the contact part between the sealing sleeve and the sealing cavity; a liquid storage cavity is provided at the connection between the radial guide hole and the axial guide hole.

[0013] Based on the structure of the quick-release plunger pump with reflux function described above, the second reflux channel is provided in multiple ways in the sealing sleeve; the inlet of each second reflux channel is connected to the second circulation hole, and the inlet of each second reflux channel is connected to the inlet valve chamber.

[0014] Based on the structure of the quick-release plunger pump with reflux function described above, the reflux assembly includes a first reflux channel, a second reflux channel, a filter module, and a check valve; the first reflux channel is disposed on the support sleeve near the end of the seal; the second reflux channel is disposed along the radial and axial directions of the seal sleeve and the pump body, and penetrates the inlet valve chamber; the filter module is disposed on the second reflux channel; and the check valve is disposed at the end of the second reflux channel.

[0015] Based on the structure of the quick-release plunger pump with reflux function described above, the second reflux channel includes a first radial pipeline, a first axial pipeline, and a second radial pipeline; the first radial pipeline passes through the sealing sleeve and the side wall of the pump body, the first axial pipeline is arranged along the length direction of the outer side wall of the pump body, and the second radial pipeline passes through the side wall of the pump body and communicates with the inlet valve chamber; the filter module is arranged in the first axial pipeline, and the one-way valve is arranged at the end of the second radial pipeline.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] 1. This innovative design features a linear internal structure for the pump body, ensuring that the power unit, sealing sleeve, inlet valve assembly, and outlet valve assembly are all aligned on the same straight line and secured by pressure plates. When disassembly is required, only the pressure plates need to be removed, allowing for independent removal of the sealing sleeve, inlet valve assembly, and outlet valve assembly from their open ends. This streamlined disassembly significantly reduces assembly time compared to traditional methods. Furthermore, the modular design allows for direct replacement of the entire module (sealing sleeve, inlet valve assembly, and outlet valve assembly), further saving time. Moreover, the modular structure allows for easy disassembly and replacement even for non-professionals. Traditional structures often have numerous and complex components, requiring skilled professionals for internal component replacement. This design also incorporates a backflow mechanism to recirculate the medium from any leak points.

[0018] 2. The structural design of this solution can greatly shorten the assembly and disassembly time, simplify the assembly process, lower the assembly threshold, and enable non-professionals to easily and quickly complete the assembly and disassembly, thus greatly improving the efficiency of assembly and disassembly. Attached Figure Description

[0019] Figure 1This is a top view of the overall structure of Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the linear cavity structure in this utility model;

[0021] Figure 3 This is a top view of the overall structure of Embodiment 2 of this utility model;

[0022] Figure Descriptions: 1. Power end; 2. Pump body; 3. Sealing sleeve assembly; 4. Inlet valve assembly; 5. Outlet valve assembly; 6. Pressure plate; 7. Linear cavity structure; 8. Reflux assembly; 31. Piston; 32. Seal; 33. Sealing sleeve; 34. First cavity; 35. First through hole; 36. Second through hole; 37. First sealing ring; 38. Second sealing ring; 39. Third sealing ring; 310. Support sleeve; 41. Inlet; 71. Sealing cavity; 72. Liquid inlet valve cavity; 73. Liquid outlet valve cavity; 81. Check valve; 82. First circulation hole; 83. Second circulation hole; 84. Connecting guide hole; 85. Radial guide hole; 86. Axial guide hole; 87. Liquid storage cavity; 88. Filter module; 89. First radial pipeline; 810. First axial pipeline; 811. Second radial pipeline. Detailed Implementation

[0023] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0024] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown, this utility model provides a technical solution:

[0029] A quick-release plunger pump 31 with reflux function includes, but is not limited to, a power end 1, a pump body 2, a sealing sleeve 3, an inlet valve group 4, an outlet valve group 5, and a pressure plate 6; the pump body 2 is open at both ends, and the pump body 2 is provided with a straight cavity structure 7 for accommodating the sealing sleeve 33, the inlet valve group 4, and the outlet valve group 5; the power end 1 and the pressure plate 6 are respectively located at both ends of the pump body 2; and a reflux assembly 8 for media reflux is provided at the movable end of the pump body 2.

[0030] Based on the above structure, this solution innovatively sets the internal cavity of the pump body 2 as a linear structure, so that the power end 1, sealing sleeve 3, inlet valve group 4, and outlet valve group 5 are all on the same straight line and are fixed by pressure plate 6. When disassembly is required, only pressure plate 6 needs to be removed, and the sealing sleeve 3, inlet valve group 4, and outlet valve group 5 can be independently removed from its open end. Disassembly can be carried out from one end only, which can greatly save assembly time compared with the traditional method. Moreover, during disassembly, the components (sealing sleeve 3, inlet valve group 4, and outlet valve group 5) can be directly removed and replaced as a whole module, which saves a lot of time. At the same time, due to the modular structure, non-professionals can also complete the disassembly and replacement. Traditional structures have many and complicated parts, requiring skilled professionals to complete the disassembly and replacement of internal parts. In addition, this solution is equipped with a return flow structure to return the medium that was originally leaking.

[0031] The hydraulic end of the traditional plunger 31 reciprocating pump has the same structure as the traditional hydraulic end. Figure 1 The plunger 31 and sealing pair can only be removed from the left end, while the inlet and outlet valve assembly 5 can be removed from the top and bottom. To facilitate the removal of the plunger 31 and sealing pair, the structural dimensions of the power end 1 will be larger. Furthermore, removing them from different directions increases the difficulty of disassembly and assembly. Another traditional hydraulic end structure... Figure 2 The inlet and outlet valves are disassembled and assembled from the right end, while the plunger 31 and sealing pair are disassembled and assembled from the left end. Similarly, the structural size of the power end 1 is large, making disassembly and assembly inconvenient and time-consuming.

[0032] As an example, the linear cavity structure 7 may include a sealing cavity 71, an inlet valve cavity 72, and an outlet valve cavity 73; a sealing sleeve 3 is disposed in the sealing cavity 71, an inlet valve assembly 4 is disposed in the inlet valve cavity 72, and an outlet valve assembly 5 is disposed in the outlet valve cavity 73; the size of the inlet valve cavity 72 is not smaller than the size of the sealing cavity 71, and a reflux assembly 8 is disposed between the sealing sleeve 3 and the inlet valve cavity 72.

[0033] Based on the above structure, since liquid leakage usually occurs at the movement point of the plunger 31, that is, during the operation of the reciprocating pump, there is a gap between the plunger 31 and the sealing pair. The medium will flow out through the gap, and as the operating time increases, the gap will widen, leading to increased leakage. In this embodiment, the leakage point is the connection point N between the plunger 31 and the power end 1. Therefore, this solution provides a return structure on the sealing sleeve 3 to return the leaked medium flowing through the surface of the plunger 31. On the one hand, this can prevent the sprayed medium from affecting the oil seal life of the power end 1 and contaminating the lubricating oil in the tank. At the same time, the leaked medium is not visible, making the entire device drier and cleaner, giving a better appearance. On the other hand, the circulation return also avoids medium waste and improves medium utilization. At the same time, the leakage medium return along this route also plays a role in circulating cooling of the friction pairs such as the seal 32 and the plunger 31, which can also greatly improve the life of the sealing pairs.

[0034] As an example, the sealing sleeve assembly 3 may include a plunger 31, a seal 32, and a sealing sleeve 33; the sealing sleeve 33 is disposed in the sealing cavity 71, and a first cavity 34 that mates with the seal 32 is disposed inside the sealing sleeve 33. A first through hole 35 that mates with the plunger 31 is disposed at the end of the sealing sleeve 33. The seal 32 is disposed in the first cavity 34, and a second through hole 36 that mates with the plunger 31 is disposed in the seal 32. The plunger 31 passes through the first through hole 35 and the second through hole 36. A support sleeve 310 is disposed in the radial direction of the plunger 31. The support sleeve 310 contacts the seal 32, and the power end is connected to the end of the plunger 31 that is away from the water inlet valve assembly 4.

[0035] Based on the above structure, the power end can drive the plunger 31 to move, and the support sleeve 310 can ensure that the plunger 31 can run stably in a predetermined direction. Under the movement of the plunger 31, the water inlet valve group 4 and the water outlet valve group 5 are realized.

[0036] As an example, the sealing sleeve 33 extends into the liquid inlet valve cavity 72 to cooperate with the water inlet valve assembly 4; a first sealing ring 37 may be provided on the contact portion between the sealing sleeve 33 and the sealing cavity 71;

[0037] Based on the above structure, the first sealing ring 37 can prevent the medium from leaking from the contact part between the sealing sleeve 33 and the sealing cavity 71, thus ensuring the overall sealing performance.

[0038] As an example, a second sealing ring 38 is provided at the contact portion between the support sleeve 310 and the plunger 31, and a third sealing ring 39 is provided at the contact portion between the support sleeve 310 and the first cavity 34.

[0039] Based on the above structure, the sealing performance can be guaranteed to a certain extent by means of the second sealing ring 38 and the third sealing ring 39. However, due to the movement characteristics of the plunger 31, it is still inevitable that the medium will leak from the outer surface of the plunger 31.

[0040] As an example, the reflux assembly 8 may include a first reflux channel, a second reflux channel, and a one-way valve 81; the first reflux channel is disposed on the support sleeve 310 near the end of the seal 32; the second reflux channel is disposed radially and axially along the seal sleeve 33 and penetrates the inlet valve chamber 72; and the one-way valve 81 is disposed at the end of the second reflux channel.

[0041] Based on the above structure, a first sealing ring 37 and a second sealing ring 38 are provided on the support sleeve 310, which can form a sealing structure under a certain pressure to prevent oil leakage; a first return channel is provided on the end of the support sleeve 310 near the seal 32, which can force the leaked medium to flow from the first return channel to the second return channel until it flows back into the liquid inlet valve chamber 72, realizing the return of the oil medium, avoiding the waste of oil, and also cooling the oil for a certain period of time.

[0042] As an example, the first return channel may include a first circulation hole 82, a second circulation hole 83, and a connecting guide hole 84. The first circulation hole 82 is disposed on the contact surface between the support sleeve 310 and the plunger 31, and the second circulation hole 83 is disposed on the contact surface between the support sleeve 310 and the first cavity 34. The connecting guide hole 84 is configured to communicate with the first circulation hole 82 and the second circulation hole 83 respectively, and at least one connecting guide hole 84 is configured between the first circulation hole 82 and the second circulation hole 83. The second circulation hole 83 is connected to the second return channel.

[0043] Based on the above structure, by setting the first circulation hole 82, a space can be provided for the oil medium leaking annularly along the plunger 31. The oil medium is cut off and transported to the second circulation hole 83 through the connecting guide hole 84. The liquid can be transported to the second return channel through the second circulation hole 83.

[0044] As an example, the second return channel may include a radial guide hole 85 and an axial guide hole 86; the axial guide hole 86 is arranged perpendicular to the radial guide hole, and a one-way valve 81 is arranged on the end of the axial guide hole 86 away from the radial guide hole 85; the axial guide hole 86 may be arranged at the contact portion between the sealing sleeve 33 and the sealing cavity 71.

[0045] A liquid storage chamber 87 may be provided at the connection between the radial guide hole 85 and the axial guide hole 86.

[0046] Based on the above structure, the liquid is transported through the second circulation hole 83 and then transported along the direction of the radial guide hole 85 and the axial guide hole 86. Since the axial guide hole 86 is set perpendicular to the radial guide hole, the oil medium will decelerate at the corner. The liquid storage chamber 87 can release the pressure at this point to a certain extent, so that the oil medium can flow back smoothly.

[0047] As an example, multiple second return channels can be provided in the sealing sleeve 33; the inlet of each second return channel is connected to the second circulation hole 83, and the inlet of each second return channel is connected to the inlet valve chamber 72.

[0048] Based on the above structure, by setting multiple secondary return channels, the cooling and heat dissipation effect of the plunger 31 can be greatly increased, which can significantly extend the service life of the sealing pair. Similarly, pressurized medium can be connected to the return path to accelerate the circulation return rate, which can also greatly increase the heat dissipation effect of the sealing pair and extend its service life.

[0049] As an example, an inlet 41 is provided at the bottom of the inlet valve chamber, and the outlet of the outlet valve group 5 is a two-sided outlet. At least two sets of sealing rings are provided on the contact part between the outlet valve group 5 and the outlet valve chamber 73.

[0050] Based on the above structure, the inlet valve group 4 in this solution is a conventional component, which includes a water valve core, valve spring, valve seat, etc. The outlet valve group 5 is a conventional component, which includes an outlet valve core, valve spring, valve seat, etc. This solution does not improve its structure, so the description of its structural parts will not be repeated. The improvement of the outlet valve group 5 in this solution is that the outlet position is changed to water outlet on both sides, and its end is sealed by pressure plate 6, so that water cannot be discharged. Two sets of sealing rings are set on the outlet valve group 5 to ensure the sealing of its end.

[0051] In this design, the plunger 31, support sleeve 310, and seal 32 are all installed inside the sealing sleeve 33; the sealing sleeve 33, inlet and outlet valve bodies, inlet valve assembly 4, outlet valve assembly 5, and sealing block are all installed inside the pump body 2. The plunger 31 is driven forward and backward by the power end 1, delivering low-pressure water from the inlet 41 through the inlet and outlet valves to the container requiring pressurization. This structure is suitable for solutions involving the recirculation of leaking media from the sealing pair.

[0052] Example 2

[0053] like Figure 3 As shown, this utility model provides a technical solution:

[0054] A quick-release plunger pump 31 with reflux function includes, but is not limited to, a power end 1, a pump body 2, a sealing sleeve 3, an inlet valve group 4, an outlet valve group 5, and a pressure plate 6; the pump body 2 is open at both ends, and the pump body 2 is provided with a straight cavity structure 7 for accommodating the sealing sleeve 33, the inlet valve group 4, and the outlet valve group 5; the power end 1 and the pressure plate 6 are respectively located at both ends of the pump body 2; and a reflux assembly 8 for media reflux is provided at the movable end of the pump body 2.

[0055] Based on the above structure, this solution innovatively sets the internal cavity of the pump body 2 as a linear structure, so that the power end 1, sealing sleeve 3, inlet valve group 4, and outlet valve group 5 are all on the same straight line and are fixed by pressure plate 6. When disassembly is required, only pressure plate 6 needs to be removed, and the sealing sleeve 3, inlet valve group 4, and outlet valve group 5 can be independently removed from its open end. Disassembly can be carried out from one end only, which can greatly save assembly time compared with the traditional method. Moreover, during disassembly, the components (sealing sleeve 3, inlet valve group 4, and outlet valve group 5) can be directly removed and replaced as a whole module, which saves a lot of time. At the same time, due to the modular structure, non-professionals can also complete the disassembly and replacement. Traditional structures have many and complicated parts, requiring skilled professionals to complete the disassembly and replacement of internal parts. In addition, this solution is equipped with a return flow structure to return the medium that was originally leaking.

[0056] The hydraulic end of the traditional plunger 31 reciprocating pump has the same structure as the traditional hydraulic end. Figure 1 The plunger 31 and sealing pair can only be removed from the left end, while the inlet and outlet valve assembly 5 can be removed from the top and bottom. To facilitate the removal of the plunger 31 and sealing pair, the structural dimensions of the power end 1 will be larger. Furthermore, removing them from different directions increases the difficulty of disassembly and assembly. Another traditional hydraulic end structure... Figure 2 The inlet and outlet valves are disassembled and assembled from the right end, while the plunger 31 and sealing pair are disassembled and assembled from the left end. Similarly, the structural size of the power end 1 is large, making disassembly and assembly inconvenient and time-consuming.

[0057] As an example, the linear cavity structure 7 may include a sealing cavity 71, an inlet valve cavity 72, and an outlet valve cavity 73; a sealing sleeve 3 is disposed in the sealing cavity 71, an inlet valve assembly 4 is disposed in the inlet valve cavity 72, and an outlet valve assembly 5 is disposed in the outlet valve cavity 73; the size of the inlet valve cavity 72 is not smaller than the size of the sealing cavity 71, and a reflux assembly 8 is disposed between the sealing sleeve 3 and the inlet valve cavity 72.

[0058] Based on the above structure, since liquid leakage usually occurs at the movement point of the plunger 31, that is, during the operation of the reciprocating pump, there is a gap between the plunger 31 and the sealing pair. The medium will flow out through the gap, and as the operating time increases, the gap will widen, leading to increased leakage. In this embodiment, the leakage point is the connection point N between the plunger 31 and the power end 1. Therefore, this solution provides a return structure on the sealing sleeve 3 to return the leaked medium flowing through the surface of the plunger 31. On the one hand, this can prevent the sprayed medium from affecting the oil seal life of the power end 1 and contaminating the lubricating oil in the tank. At the same time, the leaked medium is not visible, making the entire device drier and cleaner, giving a better appearance. On the other hand, the circulation return also avoids medium waste and improves medium utilization. At the same time, the leakage medium return along this route also plays a role in circulating cooling of the friction pairs such as the seal 32 and the plunger 31, which can also greatly improve the life of the sealing pairs.

[0059] As an example, the sealing sleeve assembly 3 may include a plunger 31, a seal 32, and a sealing sleeve 33; the sealing sleeve 33 is disposed in the sealing cavity 71, and a first cavity 34 that mates with the seal 32 is disposed inside the sealing sleeve 33. A first through hole 35 that mates with the plunger 31 is disposed at the end of the sealing sleeve 33. The seal 32 is disposed in the first cavity 34, and a second through hole 36 that mates with the plunger 31 is disposed in the seal 32. The plunger 31 passes through the first through hole 35 and the second through hole 36. A support sleeve 310 is disposed in the radial direction of the plunger 31. The support sleeve 310 contacts the seal 32, and the power end is connected to the end of the plunger 31 that is away from the water inlet valve assembly 4.

[0060] Based on the above structure, the power end can drive the plunger 31 to move, and the support sleeve 310 can ensure that the plunger 31 can run stably in a predetermined direction. Under the movement of the plunger 31, the water inlet valve group 4 and the water outlet valve group 5 are realized.

[0061] As an example, the sealing sleeve 33 extends into the liquid inlet valve cavity 72 to cooperate with the water inlet valve assembly 4; a first sealing ring 37 may be provided on the contact portion between the sealing sleeve 33 and the sealing cavity 71;

[0062] Based on the above structure, the first sealing ring 37 can prevent the medium from leaking from the contact part between the sealing sleeve 33 and the sealing cavity 71, thus ensuring the overall sealing performance.

[0063] As an example, a second sealing ring 38 is provided at the contact portion between the support sleeve 310 and the plunger 31, and a third sealing ring 39 is provided at the contact portion between the support sleeve 310 and the first cavity 34.

[0064] Based on the above structure, the sealing performance can be guaranteed to a certain extent by means of the second sealing ring 38 and the third sealing ring 39. However, due to the movement characteristics of the plunger 31, it is still inevitable that the medium will leak from the outer surface of the plunger 31.

[0065] As an example, the reflux assembly 8 may include a first reflux channel, a second reflux channel, a filter module 88, and a one-way valve 81; the first reflux channel is disposed on the support sleeve 310 near the end of the seal 32; the second reflux channel is disposed along the radial and axial directions of the seal sleeve 33 and the pump body 2, and passes through the inlet valve chamber 72; the filter module 88 is disposed on the second reflux channel; and the one-way valve 81 is disposed at the end of the second reflux channel.

[0066] Based on the above structure, a first sealing ring 37 and a second sealing ring 38 are provided on the support sleeve 310, which can form a sealing structure under a certain pressure to prevent oil leakage; a first return channel is provided on the end of the support sleeve 310 near the seal 32, which can force the leaked medium to flow from the first return channel to the second return channel until it flows back into the liquid inlet valve chamber 72, realizing the return of the oil medium, avoiding the waste of oil, and also cooling the oil for a certain period of time.

[0067] As an example, the first return channel may include a first circulation hole 82, a second circulation hole 83, and a connecting guide hole 84. The first circulation hole 82 is disposed on the contact surface between the support sleeve 310 and the plunger 31, and the second circulation hole 83 is disposed on the contact surface between the support sleeve 310 and the first cavity 34. The connecting guide hole 84 is configured to communicate with the first circulation hole 82 and the second circulation hole 83 respectively, and at least one connecting guide hole 84 is configured between the first circulation hole 82 and the second circulation hole 83. The second circulation hole 83 is connected to the second return channel.

[0068] Based on the above structure, by setting the first circulation hole 82, a space can be provided for the oil medium leaking annularly along the plunger 31. The oil medium is cut off and transported to the second circulation hole 83 through the connecting guide hole 84. The liquid can be transported to the second return channel through the second circulation hole 83.

[0069] As an example, the second return channel may include a first radial pipe 89, a first axial pipe 810, and a second radial pipe 811; the first radial pipe 89 is disposed through the sealing sleeve 33 and the side wall of the pump body 2, the first axial pipe 810 is disposed along the length direction of the outer side wall of the pump body 2, and the second radial pipe 811 is disposed through the side wall of the pump body 2 and communicates with the inlet valve chamber 72; the filter module 88 is disposed in the first axial pipe 810, and the one-way valve 81 is disposed at the end of the second radial pipe 811.

[0070] Based on the above structure, the liquid is transported through the second circulation hole 83 and then transported along the first radial pipeline 89, the first axial pipeline 810 and the second radial pipeline 811. Since the sealing material (such as soft material filler) will be worn away by friction with the plunger 31, it may affect the valve group if it enters the inlet 41 area. Therefore, a filter module 88 is set on the first axial pipeline 810 to filter impurities and ensure the cleanliness of the oil medium. At the same time, the filter module 88 is set on the outside of the pump body 2 to facilitate the removal of impurities.

[0071] As an example, an inlet 41 is provided at the bottom of the inlet valve chamber, and the outlet of the outlet valve assembly 5 is a two-sided outlet. At least two sets of sealing rings are provided on the contact part between the outlet valve assembly 5 and the outlet valve chamber 73.

[0072] Based on the above structure, the inlet valve group 4 in this solution is a conventional component, which includes a water valve core, valve spring, valve seat, etc. The outlet valve group 5 is a conventional component, which includes an outlet valve core, valve spring, valve seat, etc. This solution does not improve its structure, so the description of its structural parts will not be repeated. The improvement of the outlet valve group 5 in this solution is that the outlet position is changed to water outlet on both sides, and its end is sealed by pressure plate 6, so that water cannot be discharged. Two sets of sealing rings are set on the outlet valve group 5 to ensure the sealing of its end.

[0073] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quick-release plunger pump with reflux function, characterized in that: It includes a power end (1), a pump body (2), a sealing sleeve assembly (3), an inlet valve assembly (4), an outlet valve assembly (5), and a pressure plate (6); the pump body (2) has openings at both ends, and the pump body (2) has a straight cavity structure (7) inside for accommodating the sealing sleeve (33), the inlet valve assembly (4), and the outlet valve assembly (5); the power end (1) and the pressure plate (6) are respectively located at both ends of the pump body (2); and a return flow assembly (8) for medium return flow is provided at the movable end of the pump body (2).

2. A quick-release plunger pump with reflux function as described in claim 1, characterized in that: The linear cavity structure (7) includes a sealing cavity (71), an inlet valve cavity (72), and an outlet valve cavity (73); the sealing sleeve assembly (3) is disposed in the sealing cavity (71), the water inlet valve assembly (4) is disposed in the inlet valve cavity (72), and the water outlet valve assembly (5) is disposed in the outlet valve cavity (73); the size of the inlet valve cavity (72) is not smaller than the size of the sealing cavity (71), and the reflux assembly (8) is disposed between the sealing sleeve assembly (3) and the inlet valve cavity (72).

3. A quick-release plunger pump with reflux function as described in claim 2, characterized in that: The sealing sleeve assembly (3) includes a plunger (31), a seal (32), and a sealing sleeve (33); the sealing sleeve (33) is disposed in the sealing cavity (71), and the sealing sleeve (33) has a first cavity (34) that cooperates with the seal (32) inside. The end of the sealing sleeve (33) has a first through hole (35) that cooperates with the plunger (31). The seal (32) is disposed in the first cavity (34), and the seal (32) has a second through hole (36) that cooperates with the plunger (31). The plunger (31) passes through the first through hole (35) and the second through hole (36). A support sleeve (310) is disposed in the radial direction of the plunger (31), and the support sleeve (310) contacts the seal (32). The power end is connected to the end of the plunger (31) away from the water inlet valve assembly (4).

4. A quick-release plunger pump with reflux function as described in claim 3, characterized in that: The sealing sleeve (33) extends into the liquid inlet valve chamber (72) and cooperates with the water inlet valve assembly (4); a first sealing ring (37) is provided on the contact part between the sealing sleeve (33) and the sealing chamber (71); a second sealing ring (38) is provided on the contact part between the support sleeve (310) and the plunger (31); and a third sealing ring (39) is provided on the contact part between the support sleeve (310) and the first cavity (34).

5. A quick-release plunger pump with reflux function as described in claim 4, characterized in that: The reflux assembly (8) includes a first reflux channel, a second reflux channel, and a one-way valve (81); the first reflux channel is located on the support sleeve (310) near the end of the seal (32); the second reflux channel is arranged along the radial and axial directions of the seal sleeve (33) and passes through the inlet valve chamber (72); the one-way valve (81) is located at the end of the second reflux channel.

6. A quick-release plunger pump with reflux function as described in claim 5, characterized in that: The first return channel includes a first circulation hole (82), a second circulation hole (83), and a connecting guide hole (84). The first circulation hole (82) is disposed on the contact surface between the support sleeve (310) and the plunger (31). The second circulation hole (83) is disposed on the contact surface between the support sleeve (310) and the first cavity (34). The connecting guide hole (84) is respectively connected to the first circulation hole (82) and the second circulation hole (83). At least one connecting guide hole (84) is provided between the first circulation hole (82) and the second circulation hole (83). The second circulation hole (83) is connected to the second return channel.

7. A quick-release plunger pump with reflux function as described in claim 6, characterized in that: The second return channel includes a radial guide hole (85) and an axial guide hole (86); the axial guide hole (86) is arranged perpendicular to the radial guide hole, and the one-way valve (81) is arranged on the end of the axial guide hole (86) away from the radial guide hole (85); the axial guide hole (86) is arranged at the contact part between the sealing sleeve (33) and the sealing cavity (71); a liquid storage cavity (87) is provided at the connection between the radial guide hole (85) and the axial guide hole (86).

8. A quick-release plunger pump with reflux function as described in claim 7, characterized in that: The second return channel is provided in multiple ways in the sealing sleeve (33); the inlet of each second return channel is connected to the second circulation hole (83), and the inlet of each second return channel is connected to the inlet valve chamber (72).

9. A quick-release plunger pump with reflux function as described in claim 4, characterized in that: The reflux assembly (8) includes a first reflux channel, a second reflux channel, a filter module (88), and a one-way valve (81); the first reflux channel is located on the support sleeve (310) near the end of the seal (32); the second reflux channel is arranged radially and axially along the seal sleeve (33) and the pump body (2), and passes through the inlet valve chamber (72); the filter module (88) is located on the second reflux channel; and the one-way valve (81) is located at the end of the second reflux channel.

10. A quick-release plunger pump with reflux function as described in claim 9, characterized in that: The second return channel includes a first radial pipe (89), a first axial pipe (810), and a second radial pipe (811); the first radial pipe (89) is disposed through the sealing sleeve (33) and the side wall of the pump body (2), the first axial pipe (810) is disposed along the length direction of the outer side wall of the pump body (2), and the second radial pipe (811) is disposed through the side wall of the pump body (2) and communicates with the inlet valve chamber (72); the filter module (88) is disposed in the first axial pipe (810), and the one-way valve (81) is disposed at the end of the second radial pipe (811).

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