Hydraulic pump station

Abstract

The utility model provides a hydraulic pump station, and belongs to the technical field of hydraulic pumps. The problem that an existing hydraulic pump station is poor in sealing performance is solved. The hydraulic pump station comprises a main cylinder body, two cylinder covers arranged at the two ends of the main cylinder body respectively and a piston shaft arranged on the main cylinder body and matched with the main cylinder body in a sliding mode, through holes allowing a piston rod to axially penetrate through are formed in the cylinder covers, and outer cylinder bodies connected with the cylinder covers and matched with the piston rod are arranged on the cylinder covers. A stabilizing unit which is connected with the piston shaft and improves operation stability is arranged on the peripheral wall, located in the main cylinder body, of the piston shaft, and a sealing unit which is connected with the piston shaft, matched with the outer cylinder body and improves sealing performance of the connecting position is arranged on the peripheral wall, located at the outer cylinder body, of the piston shaft. A connecting unit which is connected with the cylinder cover and enables the outer cylinder body to be connected with the cylinder cover is arranged at the position, connected with the outer cylinder body, of the cylinder cover. The sealing structure has the advantage of being good in sealing performance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydraulic pump technical field relates to a kind of hydraulic pump station. BACKGROUND

[0002] Hydraulic pump station is by hydraulic pump, driving motor, oil tank, directional valve, throttle valve, overflow valve and so on constitute the hydraulic source device or the hydraulic device including control valve. According to the flow direction, pressure and flow required by driving device, oil is supplied, suitable for driving device and hydraulic station separation on various machines, connect hydraulic station and driving device (oil cylinder or motor) with oil pipe, and hydraulic system can realize various specified actions, its internal seal is generally sealed by sealing ring, but in actual use process, single sealing ring structure cannot long-term satisfy sealing effect, so it needs to be checked and replaced regularly, and its checking process is relatively inconvenient, so it does not meet the use demand. SUMMARY

[0003] The utility model discloses a kind of hydraulic pump stations for the above problems existing in prior art, with good sealing and prolong its service life.

[0004] The utility model discloses a kind of hydraulic pump stations, including main cylinder body, two respectively set up in the cylinder cover of main cylinder body both ends and set up on the piston shaft of main cylinder body and with its sliding fit, the through hole for piston rod axial installation is set up in the cylinder cover, and the outer cylinder body is set up in the cylinder cover and is connected with it and is matched with piston rod, it is characterized in that, the outer peripheral wall of the piston shaft in main cylinder body is provided with the stability unit being connected with it and improving operating stability, the outer peripheral wall of the piston shaft at outer cylinder body is provided with the sealing unit being connected with it, and is matched with outer cylinder body, and improves the sealing property of connecting portion, the cylinder cover is provided with the connecting unit being connected with cylinder cover and making outer cylinder body and cylinder cover be connected in the connecting portion of outer cylinder body.

[0005] In the above-mentioned hydraulic pump station, the stability unit includes a piston ring provided on the piston rod, an annular groove is formed in the outer peripheral wall of the piston ring, and a sealing ring is provided in the annular groove. The outer end of the sealing ring is located outside the annular groove, and the outer end surface of the sealing ring is arranged in an arc shape. Elastic grooves are formed in the two side walls of the annular groove to improve the elastic sealing effect of the sealing ring.

[0006] In the hydraulic pump station, the connecting unit comprises a connecting flange which is in contact with the cylinder cover and is hollow, and connecting studs which connect the connecting flange and the cylinder cover, and the connecting flange is coaxial with the outer cylinder body, the inner wall of the connecting flange is provided with a convex ring part one which protrudes radially inward, and the outer wall of the outer cylinder body at the connecting flange is provided with a convex ring part two which protrudes radially outward and is in contact with the convex ring part one.

[0007] In the hydraulic pump station, the connecting flange and the cylinder cover are provided with an O-ring which is embedded in the connecting flange and is in contact with the cylinder cover.

[0008] In the hydraulic pump station, the piston shaft and the cylinder cover are provided with a bushing which is sleeved on the piston shaft, the cylinder cover is provided with an assembly groove which is used for assembling the bushing and limiting the position of the bushing, and the piston shaft and the cylinder cover are also provided with a sealing ring which is sleeved on the piston shaft and is used for enhancing the sealing performance.

[0009] In the hydraulic pump station, the sealing unit comprises a plurality of rubber rings, the rubber rings are sleeved on the piston shaft, the outer cylinder body is provided with a plurality of assembly grooves which are used for assembling the corresponding rubber rings and limiting the positions of the rubber rings, and the rubber rings are also provided with elastic grooves.

[0010] Compared with the prior art, the hydraulic pump station improves the sealing performance of the connection through the sealing unit. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a sectional view of the hydraulic pump station.

[0012] In the figure, 1 is a main cylinder body, 2 is a cylinder cover, 3 is a piston shaft, 4 is an outer cylinder body, 5 is a piston ring, 6 is a sealing ring, 7 is a connecting flange, 8 is a connecting stud, 9 is a convex ring part one, 10 is a convex ring part two, 11 is a bushing, and 12 is a rubber ring. DETAILED DESCRIPTION

[0013] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0014] As Figure 1As shown, the hydraulic pump station comprises a main cylinder body 1, two cylinder covers 2 respectively arranged at two ends of the main cylinder body 1, and a piston shaft 3 arranged on the main cylinder body 1 and in sliding fit with the main cylinder body 1, the cylinder cover 2 is provided with a through hole for the piston rod to pass through in the axial direction, and the cylinder cover 2 is provided with an outer cylinder body 4 connected with the cylinder cover 2 and matched with the piston rod, the outer peripheral wall of the piston shaft 3 located in the main cylinder body 1 is provided with a stabilizing unit connected with the piston shaft 3 and improving the operation stability, the outer peripheral wall of the piston shaft 3 located at the outer cylinder body 4 is provided with a sealing unit connected with the piston shaft 3 and matched with the outer cylinder body 4, and the sealing performance of the connection part is improved, the cylinder cover 2 located at the connection part of the outer cylinder body 4 is provided with a connecting unit connected with the cylinder cover 2 and connecting the outer cylinder body 4 with the cylinder cover 2, the stabilizing unit comprises a piston ring 5 arranged on the piston rod, the outer peripheral wall of the piston ring 5 is provided with an annular groove, the piston ring 5 located in the annular groove is provided with a sealing ring 6, the outer end of the sealing ring 6 is located outside the annular groove, and the outer end surface of the sealing ring 6 is arranged in an arc structure, the sealing ring 6 located in the annular groove is provided with an elastic groove on the two side walls to improve the elastic sealing effect, the connecting unit comprises a connecting flange 7 in hollow fit with the cylinder cover 2 and a plurality of connecting studs 8 connecting the connecting flange 7 with the cylinder cover 2, and the connecting flange 7 is coaxially arranged with the outer cylinder body 4, the inner wall of the connecting flange 7 is provided with a convex ring part one 9 protruding radially inward, the outer wall of the outer cylinder body 4 located at the connecting flange 7 is provided with a convex ring part two 10 protruding radially outward and abutting against the convex ring part one 9, and the sealing unit comprises a plurality of rubber rings 12, the plurality of rubber rings 12 are sleeved on the piston shaft 3, the outer cylinder body 4 is provided with a plurality of installation grooves for installing the corresponding rubber rings 12 and limiting the position of the rubber rings 12, the rubber rings 12 are also provided with elastic grooves, and the rubber rings 12 located at the elastic grooves are provided with an elastic expansion part on the side wall.

[0015] As a preferred structure, an O-ring is arranged between the connecting flange 7 and the cylinder cover 2 and embedded in the connecting flange 7 and abutting against the cylinder cover 2.

[0016] As a preferred structure, a bushing 11 is sleeved on the piston shaft 3 between the piston shaft 3 and the cylinder cover 2, the cylinder cover 2 is provided with an assembly groove for installing the bushing 11 and limiting the position of the bushing 11, and a sealing ring is also arranged between the piston shaft 3 and the cylinder cover 2 and sleeved on the piston shaft 3 to strengthen the sealing performance, the cylinder cover 2 is also provided with an assembly groove for installing the sealing ring, and the sealing ring is also provided with an elastic groove.

[0017] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

[0018] Although the same terms are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present application; it is against the spirit of the present application to interpret them as any kind of additional limitation.

Claims

1. A hydraulic pump station, comprising a main cylinder body (1), two cylinder heads (2) respectively disposed at both ends of the main cylinder body (1), and a piston shaft (3) disposed on and slidably engaged with the main cylinder body (1), wherein each cylinder head (2) is provided with a through hole for the piston rod to pass through axially for installation, and an outer cylinder body (4) connected to and engaged with the piston rod is provided on the cylinder head (2), characterized in that, The piston shaft (3) is provided with a stabilizing unit on the outer peripheral wall inside the main cylinder (1) to improve the stability of operation. The piston shaft (3) is provided with a sealing unit on the outer peripheral wall of the outer cylinder (4) to improve the sealing of the connection. The cylinder head (2) is provided with a connecting unit at the connection with the outer cylinder (4) to connect the cylinder head (2) and connect the outer cylinder (4) with the cylinder head (2).

2. A hydraulic pump station according to claim 1, characterized in that, The stabilizing unit includes a piston ring (5) disposed on the piston rod. An annular groove is provided on the outer peripheral wall of the piston ring (5). A sealing ring (6) is disposed in the annular groove of the piston ring (5). The outer end of the sealing ring (6) is located outside the annular groove, and the outer end face of the sealing ring (6) is arranged in an arc shape. Elastic grooves for improving the elastic sealing effect are provided on the two side walls of the sealing ring (6) located in the annular groove.

3. A hydraulic pump station according to claim 1, characterized in that, The connecting unit includes a connecting flange (7) that fits against the cylinder head (2) and is hollow, and several connecting studs (8) that connect the connecting flange (7) to the cylinder head (2). The connecting flange (7) and the outer cylinder body (4) are coaxially arranged. The inner wall of the connecting flange (7) is provided with a radially inward protruding convex ring part one (9). The outer wall of the outer cylinder body (4) located at the connecting flange (7) is provided with a radially outward protruding convex ring part two (10) that abuts against the convex ring part one (9).

4. A hydraulic pump station according to claim 3, characterized in that, An O-ring is provided between the connecting flange (7) and the cylinder head (2), which is embedded in the connecting flange (7) and abuts against the cylinder head (2).

5. A hydraulic pump station according to claim 1, characterized in that, A bushing (11) is provided between the piston shaft (3) and the cylinder head (2) and is fitted on the piston shaft (3). The cylinder head (2) is provided with an assembly groove for installing the bushing (11) and restricting its position. A sealing ring is also provided between the piston shaft (3) and the cylinder head (2) and is fitted on the piston shaft (3) and is used to enhance the sealing performance.

6. A hydraulic pump station according to claim 1, characterized in that, The sealing unit comprises several rubber rings (12), which are sleeved on the piston shaft (3). The outer cylinder (4) has several mounting grooves for mounting the corresponding rubber rings (12) and for limiting the position of the rubber rings (12). The rubber rings (12) also have elastic grooves.

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