Hydraulic pump

Abstract

The utility model provides a hydraulic pump which comprises a first shell and a second shell which are connected with each other, the first shell is provided with a hydraulic cavity and a communication port communicated with the hydraulic cavity, and the second shell is provided with a booster cavity. The driving shaft is rotatably arranged at the communicating port, one end of the driving shaft extends into the hydraulic cavity, and the other end of the driving shaft extends into the pressurizing cavity; the sealing sleeve is arranged on the driving shaft in a sleeving mode, the sealing sleeve is arranged at the end of the communicating opening, the sealing sleeve is provided with an inner wall face and a first end face which are connected with each other, the inner wall face is in sealing contact with the driving shaft, the first end face is arranged opposite to a gap between the driving shaft and the communicating opening, and the first end face is in sealing contact with the end wall, located at the communicating opening, of the first shell. According to the technical scheme provided by the utility model, the technical problem that hydraulic oil in the plunger pump shell in the prior art is completely sucked can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, in particular to a hydraulic pump. Background Art

[0002] At present, when the atmospheric pressure of the environment where the plunger pump is located decreases, the inlet pressure of the plunger pump will decrease. In this case, the plunger pump will cavitate, generate noise and vibration, damage the parts inside the plunger pump, and reduce the performance of the plunger pump. In this case, a booster pump is usually added in front of the plunger pump to increase the inlet pressure of the plunger pump to avoid cavitation.

[0003] However, the combination of the plunger pump and the booster pump usually makes the oil suction port of the booster pump connected to the housing of the plunger pump. When the pump body is working, part of the hydraulic oil in the plunger pump housing will enter the oil inlet of the booster pump, causing the hydraulic oil in the housing to be sucked out by the booster pump, resulting in low pressure in the housing and affecting the sealing of the pump body. At the same time, this will also prevent the hydraulic oil in the housing from entering the oil tank, and part of the hydraulic oil will not be filtered by the filter, so that impurities in the hydraulic oil will enter the friction pair, causing abnormal wear of parts. Utility Model Content

[0004] The main purpose of the utility model is to provide a hydraulic pump to solve the technical problem that the hydraulic oil in the casing of the plunger pump in the prior art is sucked out.

[0005] In order to achieve the above object, the utility model provides a hydraulic pump, comprising:

[0006] A first shell and a second shell connected to each other, the first shell having a hydraulic chamber and a communication port communicating with the hydraulic chamber, and the second shell having a pressurizing chamber;

[0007] A drive shaft is rotatably disposed at the communication port, one end of the drive shaft extends into the hydraulic chamber, and the other end of the drive shaft extends into the boost chamber;

[0008] A sealing sleeve is sleeved on the drive shaft and is arranged at the end of the communicating port. The sealing sleeve has an inner wall surface and a first end surface that are connected to each other. The inner wall surface is in sealing contact with the drive shaft. The first end surface is arranged opposite to the gap between the drive shaft and the communicating port. The first end surface is in sealing contact with the end wall of the first shell located at the communicating port.

[0009] Furthermore, the sealing sleeve is arranged on a side of the first housing close to the hydraulic chamber.

[0010] Furthermore, a mounting groove is provided on the first shell, the mounting groove is located at the end of the communicating port, the mounting groove is communicated with the communicating port, the mounting groove is matched with the shape of the outer circumferential surface of the sealing sleeve, and the sealing sleeve is installed in the mounting groove.

[0011] Furthermore, the mounting groove is arranged on a side of the first housing close to the hydraulic chamber.

[0012] Furthermore, the sealing sleeve has an outer wall surface, and the outer wall surface is in sealing contact with the peripheral wall of the installation groove.

[0013] Furthermore, the sealing sleeve also has a second end surface, and the first end surface and the second end surface are respectively located at two ends of the sealing sleeve;

[0014] Wherein, the second end surface is arranged flush with the installation top surface of the periphery of the notch of the installation slot;

[0015] Alternatively, the second end surface is located in the mounting groove.

[0016] Furthermore, a gap between the outer wall of the driving shaft and the communicating port is d1, 0.025 mm ≤ d1 ≤ 0.15 mm.

[0017] Furthermore, a keyway is provided on the drive shaft; and the hydraulic pump further comprises:

[0018] An impeller is arranged on the driving shaft, the impeller is located in the boosting chamber, the impeller comprises a wheel body and a mounting key which are connected to each other, the shape of the mounting key matches the shape of the key slot, and the mounting key is mounted in the key slot;

[0019] Among them, the gap between the installation key and the keyway is d2, 0.025mm≤d2≤0.15mm.

[0020] Furthermore, the sealing sleeve is a shaft sealing structure.

[0021] Further, the first housing is provided with an oil inlet connected to the hydraulic chamber, the oil inlet and the connecting port are spaced apart, the second housing is provided with an oil outlet connected to the boosting chamber, the oil outlet and the oil inlet are arranged opposite to each other; and / or,

[0022] The hydraulic pump also includes a plunger, which is arranged on the drive shaft and is located in the hydraulic chamber.

[0023] By applying the technical solution of the utility model, the inner wall surface of the sealing sleeve can be sealed in contact with the drive shaft through the setting of the sealing sleeve, and the first end surface of the sealing sleeve can be sealed in contact with the end wall of the first housing located at the connecting port, so that the hydraulic oil in the hydraulic chamber will not enter the boosting chamber through the gap between the drive shaft and the connecting port, thereby avoiding the possibility of the hydraulic oil in the hydraulic chamber being sucked out, ensuring the pressure inside the hydraulic chamber, and also ensuring that the hydraulic oil in the hydraulic chamber can smoothly flow into the oil tank and be filtered by the filter, avoiding impurities in the hydraulic oil from entering the friction pair, and effectively reducing the failure rate of the pump body. Therefore, the hydraulic pump provided by this embodiment can solve the technical problem of the hydraulic oil in the plunger pump housing being sucked out in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0025] Figure 1 A partial cross-sectional structural schematic diagram of a hydraulic pump provided according to an embodiment of the utility model is shown;

[0026] Figure 2 Shows Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0027] The above drawings include the following reference numerals:

[0028] 10. First housing; 11. Hydraulic chamber; 12. Communication port; 13. Mounting groove; 14. Mounting top surface; 15. Oil inlet; 16. Active clearance;

[0029] 20. Second housing; 21. Pressurization chamber; 22. Oil outlet;

[0030] 30. Drive shaft;

[0031] 40. Sealing sleeve; 41. Inner wall surface; 42. First end surface; 43. Outer wall surface; 44. Second end surface;

[0032] 50. Impeller; 51. Wheel body; 52. Mounting key. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] like Figure 1 to Figure 2 As shown, an embodiment of the utility model provides a hydraulic pump, which includes a first housing 10 and a second housing 20 connected to each other, the first housing 10 has a hydraulic chamber 11 and a communication port 12 connected to the hydraulic chamber 11, and the second housing 20 has a boost chamber 21. The hydraulic pump also includes a drive shaft 30, which is rotatably arranged at the communication port 12, one end of the drive shaft 30 extends into the hydraulic chamber 11, and the other end of the drive shaft 30 extends into the boost chamber 21. The hydraulic pump also includes a sealing sleeve 40, which is sleeved on the drive shaft 30, and the sealing sleeve 40 is arranged at the end of the communication port 12. The sealing sleeve 40 has an inner wall surface 41 and a first end surface 42 connected to each other, the inner wall surface 41 is in sealing contact with the drive shaft 30, the first end surface 42 is arranged opposite to the gap between the drive shaft 30 and the communication port 12, and the first end surface 42 is in sealing contact with the end wall of the first housing 10 located at the communication port 12.

[0035] The hydraulic pump provided by this embodiment can make the inner wall surface 41 of the sealing sleeve 40 in sealing contact with the drive shaft 30 through the setting of the sealing sleeve 40, and at the same time make the first end surface 42 of the sealing sleeve 40 in sealing contact with the end wall of the first housing 10 located at the connecting port 12, so that the hydraulic oil in the hydraulic chamber 11 will not enter the boosting chamber 21 through the gap between the drive shaft 30 and the connecting port 12, thereby avoiding the possibility of the hydraulic oil in the hydraulic chamber 11 being sucked out, ensuring the pressure inside the hydraulic chamber 11, and also ensuring that the hydraulic oil in the hydraulic chamber 11 can smoothly flow into the oil tank and be filtered by the filter, avoiding impurities in the hydraulic oil from entering the friction pair, and effectively reducing the failure rate of the pump body. Therefore, the hydraulic pump provided by this embodiment can solve the technical problem of the hydraulic oil in the plunger pump housing being sucked out in the prior art.

[0036] Specifically, the sealing sleeve 40 is arranged on a side of the first housing 10 close to the hydraulic chamber 11. With such a structural arrangement, the sealing sleeve 40 can be further pressed by the oil pressure inside the hydraulic chamber 11 to ensure its sealing performance. At the same time, such an arrangement can also avoid mutual interference between the sealing sleeve 40 and other structural components in the second housing 20, ensuring the operational stability of the pump body.

[0037] In this embodiment, a mounting groove 13 is provided on the first housing 10, the mounting groove 13 is located at the end of the communication port 12, the mounting groove 13 is connected to the communication port 12, the mounting groove 13 is adapted to the shape of the outer peripheral surface of the sealing sleeve 40, and the sealing sleeve 40 is installed in the mounting groove 13. With such a structural setting, the sealing sleeve 40 can be placed in the mounting groove 13 through the setting of the mounting groove 13, avoiding mutual interference between the sealing sleeve 40 and other structural components near the communication port 12, thereby ensuring the stability of the pump body operation.

[0038] Specifically, the mounting groove 13 is arranged on one side of the first housing 10 close to the hydraulic chamber 11. With such a structural arrangement, the sealing sleeve 40 can be further pressed by the oil pressure inside the hydraulic chamber 11 to ensure its sealing performance. At the same time, such an arrangement can also avoid mutual interference between the sealing sleeve 40 and other structural components in the second housing 20, ensuring the operational stability of the pump body.

[0039] Specifically, the sealing sleeve 40 has an outer wall surface 43, and the outer wall surface 43 is in sealing contact with the peripheral wall of the installation groove 13. In this way, the hydraulic oil in the hydraulic chamber 11 can be prevented from flowing into the gap between the outer wall surface 43 and the peripheral wall of the installation groove 13, further improving the sealing effect.

[0040] Specifically, the sealing sleeve 40 further has a second end face 44, and the first end face 42 and the second end face 44 are respectively located at two ends of the sealing sleeve 40. The second end face 44 is flush with the mounting top face 14 of the groove edge of the mounting groove 13. With such a structural arrangement, the sealing sleeve 40 can be better pressed by utilizing the oil pressure in the hydraulic chamber 11, further improving the sealing effect, and also facilitating better reduction of interference between the sealing sleeve 40 and other structural components, thereby ensuring the running stability of the pump body.

[0041] Specifically, the second end surface 44 is located in the installation groove 13, so that the interference between the sealing sleeve 40 and other structural components can be better reduced, thereby ensuring the operational stability of the pump body.

[0042] Specifically, there is a movable gap 16 between the outer wall of the drive shaft 30 and the communication port 12, so that when the drive shaft 30 rotates, the drive shaft 30 will not interfere with other structural components in the first housing 10, effectively preventing the drive shaft 30 from getting stuck.

[0043] Specifically, the gap between the outer wall of the drive shaft 30 and the communication port 12 is d1, 0.025mm≤d1≤0.15mm. With such a structural setting, an oil film can be formed when the hydraulic oil flows through the gap between the outer wall of the drive shaft 30 and the communication port 12, and the oil film is used to achieve sealing, thereby preventing the hydraulic oil in the hydraulic chamber 11 from flowing into the boost chamber 21, causing the hydraulic oil in the hydraulic chamber 11 to be sucked out, and effectively ensuring the stable operation of the pump body.

[0044] In this embodiment, a keyway is provided on the drive shaft 30. The hydraulic pump further comprises an impeller 50, which is provided on the drive shaft 30 and is located in the boost chamber 21. The impeller 50 comprises a wheel body 51 and a mounting key 52 which are connected to each other. The shape of the mounting key 52 matches the shape of the keyway, and the mounting key 52 is installed in the keyway. The gap between the mounting key 52 and the keyway is d2, 0.025mm≤d2≤0.15mm. With such a structural setting, the keyway can be set to facilitate the quick installation between the impeller 50 and the drive shaft 30. At the same time, by setting the gap between the mounting key 52 and the keyway, an oil film can be formed when the hydraulic oil flows through the gap between the mounting key 52 and the keyway, and the sealing is achieved by the oil film, so that the hydraulic oil in the hydraulic chamber 11 is prevented from flowing into the boost chamber 21, resulting in the hydraulic oil in the hydraulic chamber 11 being sucked out, thereby effectively ensuring the stable operation of the pump body.

[0045] Specifically, the gap between the installation key 52 and the key slot is the gap between the bottom wall of the key slot and the key surface of the installation key 52 .

[0046] Specifically, the installation key may be a flat key or a spline.

[0047] Specifically, the second housing 20 is a volute, and the volute has a boosting chamber 21. The impeller 50 and the volute form a boosting pump part.

[0048] In order to achieve stable sealing, the sealing sleeve 40 is a shaft sealing structure.

[0049] In this embodiment, the first housing 10 is provided with an oil inlet 15 connected to the hydraulic chamber 11, and the oil inlet 15 is spaced apart from the connecting port 12. The second housing 20 is provided with an oil outlet 22 connected to the boosting chamber 21, and the oil outlet 22 is arranged opposite to the oil inlet 15. With such a structural arrangement, the hydraulic oil pumped out of the boosting chamber 21 can enter the oil inlet 15 through the oil outlet 22, and then enter the hydraulic chamber 11, thereby increasing the hydraulic oil pressure in the hydraulic chamber 11 and effectively avoiding the occurrence of cavitation.

[0050] Specifically, the hydraulic pump further includes a plunger, which is arranged on the drive shaft 30 and is located in the hydraulic chamber 11. In this way, the hydraulic oil in the hydraulic chamber 11 is pressurized and pumped by the plunger to form a plunger pump part. The hydraulic pump in this embodiment forms an integrated arrangement of a plunger pump and a booster pump.

[0051] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: a shaft seal is added between the pump housing and the boost chamber to ensure that the hydraulic oil in the housing does not enter the boost chamber, effectively preventing the hydraulic oil in the housing from being sucked out, and ensuring that the hydraulic oil is filtered.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0054] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0057] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A hydraulic pump, characterized in that: include: A first housing (10) and a second housing (20) connected to each other, wherein the first housing (10) has a hydraulic chamber (11) and a communication port (12) communicating with the hydraulic chamber (11), and the second housing (20) has a pressurizing chamber (21); A drive shaft (30) is rotatably disposed at the communication port (12), one end of the drive shaft (30) extends into the hydraulic chamber (11), and the other end of the drive shaft (30) extends into the pressure chamber (21); A sealing sleeve (40) is sleeved on the drive shaft (30), the sealing sleeve (40) is arranged at the end of the connecting port (12), the sealing sleeve (40) has an inner wall surface (41) and a first end surface (42) which are connected to each other, the inner wall surface (41) is in sealing contact with the drive shaft (30), the first end surface (42) is arranged relative to the gap between the drive shaft (30) and the connecting port (12), and the first end surface (42) is in sealing contact with the end wall of the first shell (10) located at the connecting port (12).

2. The hydraulic pump according to claim 1, characterized in that: The sealing sleeve (40) is arranged on a side of the first housing (10) close to the hydraulic chamber (11).

3. The hydraulic pump according to claim 1, characterized in that: The first shell (10) is provided with a mounting groove (13), the mounting groove (13) is located at the end of the connecting port (12), the mounting groove (13) is connected to the connecting port (12), the mounting groove (13) is matched with the shape of the outer peripheral surface of the sealing sleeve (40), and the sealing sleeve (40) is installed in the mounting groove (13).

4. The hydraulic pump according to claim 3, characterized in that: The mounting groove (13) is arranged on a side of the first housing (10) close to the hydraulic chamber (11).

5. The hydraulic pump according to claim 3, characterized in that: The sealing sleeve (40) has an outer wall surface (43), and the outer wall surface (43) is in sealing contact with the peripheral wall of the installation groove (13).

6. The hydraulic pump according to claim 3, characterized in that: The sealing sleeve (40) further comprises a second end surface (44), wherein the first end surface (42) and the second end surface (44) are respectively located at two ends of the sealing sleeve (40); Wherein, the second end surface (44) is arranged flush with the installation top surface (14) at the periphery of the slot opening of the installation slot (13); Alternatively, the second end surface (44) is located in the mounting groove (13).

7. The hydraulic pump according to claim 2, characterized in that: The gap between the outer wall of the driving shaft (30) and the communicating port (12) is d1, and 0.025 mm ≤ d1 ≤ 0.15 mm.

8. The hydraulic pump according to claim 2, characterized in that: The drive shaft (30) is provided with a keyway; the hydraulic pump further comprises: An impeller (50) is arranged on the driving shaft (30), the impeller (50) is located in the boost chamber (21), the impeller (50) comprises a wheel body (51) and a mounting key (52) connected to each other, the shape of the mounting key (52) is adapted to the shape of the key slot, and the mounting key (52) is mounted in the key slot; Wherein, the gap between the installation key (52) and the key slot is d2, 0.025mm≤d2≤0.15mm.

9. The hydraulic pump according to any one of claims 1 to 8, characterized in that The sealing sleeve (40) is a shaft sealing structure.

10. The hydraulic pump according to any one of claims 1 to 8, characterized in that The first housing (10) is provided with an oil inlet (15) communicating with the hydraulic chamber (11), the oil inlet (15) and the communication port (12) being arranged at a distance, and the second housing (20) is provided with an oil outlet (22) communicating with the boosting chamber (21), the oil outlet (22) being arranged opposite to the oil inlet (15); and / or, The hydraulic pump further comprises a plunger, wherein the plunger is arranged on the drive shaft (30) and is located in the hydraulic chamber (11).

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