Improved hydraulic pump system

Abstract

The utility model discloses an improved hydraulic pump system, the oil storage cavity between the outer cover and oil cylinder is equipped with throttle valve, the throttle valve is located between the oil drain valve and the mailbox, the throttle valve is arranged in the oil return hole of valve body, the oil circuit inside oil pump valve body is reoptimized design, the throttle valve is set to the back of oil drain valve, namely the throttle valve is located between the oil drain valve and oil tank (the cavity formed between the outer cover and oil cylinder), and such setting is low to the sealing of throttle valve and the accuracy requirement of spare part, can greatly reduce the technological cost, promotes the reliability and durability of product, obviously improves production efficiency, and reduces cost.

Description

Technical Field

[0001] This utility model relates to an improved hydraulic pump system, belonging to the field of jack technology. Background Technology

[0002] The throttle valve of the existing hydraulic pump system is located at the front end of the drain valve, as shown in the figure. That is, the throttle valve is located between the oil cylinder and the drain valve. In this way, the throttle valve is always under high pressure during normal operation. The working conditions of the throttle valve are harsh, the sealing requirements of the throttle valve are extremely high, and the design and processing requirements of the components are high. Working in such an environment for a long time will affect its service life and durability. Utility Model Content

[0003] To address the aforementioned technical problems in existing technologies, this utility model proposes an improved hydraulic pump system. The internal oil circuit of the pump valve body is redesigned and the throttle valve is positioned after the drain valve, specifically between the drain valve and the oil tank (within the cavity formed between the outer casing and the cylinder). With this configuration, when the hydraulic cylinder is operating normally (at which point the drain valve is closed, and the pressurized oil in the cylinder is disconnected from the throttle valve), the throttle valve is in a zero-pressure state. When the drain valve opens and the hydraulic cylinder is drained, the hydraulic oil flows directly back to the oil tank through the throttle valve. At this time, the pressure on the throttle valve is also extremely low, meaning the throttle valve is always in a zero-pressure or low-pressure state. This reduces the requirements for the throttle valve's sealing and the precision of its components, significantly lowering process costs and improving product reliability and durability.

[0004] The technical solution adopted in this utility model is:

[0005] An improved hydraulic pump system includes an outer sleeve (1), a valve body (2), a pump body (5) that mates with the valve body (2), a pump core (7), and a cylinder (3) with a piston rod (4). The outer sleeve (1) is coaxially fitted onto the outside of the cylinder (3) and is fixed to the cylinder (3) by a top cap (11). There is an oil storage chamber between the outer sleeve (1) and the cylinder (3), and a sealed oil chamber between the piston installed at the insertion end of the piston rod (4) and the cylinder (3). The valve body (2) is installed on the outer sleeve (1). At the end of the pump core, the pump core is inserted into the inner cavity of the pump body (5) and is slidably connected to it in a sealed manner; a drain valve rod (6) is installed on the valve body (2), the drain valve rod (6) is installed in the drain hole of the valve body (2), characterized in that a throttle valve (13) is installed in the oil storage cavity between the outer sleeve (1) and the oil cylinder (3), the throttle valve (13) is located between the drain valve (14) and the oil tank, the throttle valve (13) is set in the return oil hole of the valve body (2), wherein:

[0006] The throttle valve (13) includes a throttle pin, a throttle valve screw and a return spring. The inner end face of the throttle valve screw is provided with an oil return chamber, which is connected to the oil storage chamber through a first connecting hole.

[0007] The inner end face of the drain valve stem and the drain hole form a drain chamber, and the drain chamber is connected to the sealing oil chamber; the throttling section is connected to the drain chamber through the second connecting hole; a steel ball (10) is provided between the second connecting hole and the drain chamber.

[0008] Furthermore, the oil return hole is a two-stage stepped hole, including a sealing section for inserting a throttle valve screw and a throttle section for placing a throttle pin. The diameter of the sealing section is larger than the diameter of the throttle section. The throttle valve screw is coaxially inserted into the sealing section of the oil return hole from the outside to the inside, and the two are sealed and screwed together. The throttle pin is coaxially inserted into the throttle section of the oil return hole, and a throttle gap is left between the throttle pin and the throttle section. The throttle pin can move axially along the throttle section, wherein the end face of the throttle pin can block the stepped end face of the oil return cavity of the throttle valve screw. The inner end face of the throttle pin is provided with a throttle groove. One end of the return spring is connected to the upper end face of the throttle pin, and the other end is connected to the inner end face of the oil return cavity.

[0009] Furthermore, the throttle valve screw (9) is coaxially arranged with the throttle pin (8).

[0010] Furthermore, a sealing ring is provided between the throttle valve screw (9) and the valve body (2).

[0011] Furthermore, a protective sleeve (9) is fitted onto the pump body (5).

[0012] Furthermore, a universal joint component (8) is provided at the upper end of the drain valve stem (6).

[0013] When the hydraulic cylinder system of this utility model is working normally, the drain valve is closed, the pressure oil in the cylinder is disconnected from the throttle valve, and the throttle valve is in a zero-pressure state. When the drain valve is opened and the hydraulic cylinder unloads oil, the hydraulic oil flows directly back to the oil tank through the throttle valve. At this time, the pressure on the throttle valve is also extremely low, that is, the throttle valve is always in a zero-pressure or low-pressure state.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention optimizes the internal oil circuit of the oil pump valve body by redesigning the throttle valve and placing it after the drain valve. Specifically, the throttle valve is located between the drain valve and the oil tank (in the cavity formed between the outer sleeve and the oil cylinder). This arrangement ensures that the throttle valve is always in a zero-pressure or low-pressure state, reducing the requirements for the sealing of the throttle valve and the precision of its components. This can greatly reduce process costs, improve product reliability and durability, significantly increase production efficiency, and reduce costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a hydraulic schematic diagram.

[0018] Figure 3 This is a schematic diagram of the existing technology structure. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0027] refer to Figures 1 to 2 This utility model discloses an improved hydraulic pump system, comprising an outer sleeve 1, a valve body 2, a pump core 7 cooperating with the valve body 2, and a cylinder 3 with a piston rod 4. The outer sleeve 1 is coaxially fitted onto the outside of the cylinder 3 and fixed to the cylinder 3 by a top cap 11. An oil storage chamber is located between the outer sleeve 1 and the cylinder 3, and a sealed oil chamber is located between the piston installed at the insertion end of the piston rod 4 and the cylinder 3. The valve body 2 is installed at the end of the outer sleeve 1, and the pump core is inserted into the inner cavity of the pump body 5 and slidably connected thereto. A drain valve rod 6 is installed on the valve body 2, and the drain valve rod 6 is installed in the drain hole of the valve body 2. The system is characterized in that a throttle valve 13 is installed in the oil storage chamber between the outer sleeve 1 and the cylinder 3, the throttle valve 13 is located between the drain valve 14 and the oil tank, and the throttle valve 13 is located in the return oil hole of the valve body 2.

[0028] The throttle valve 13 includes a throttle pin, a throttle valve screw, and a return spring. The inner end face of the throttle valve screw has an oil return chamber, which is connected to the oil storage chamber through a first connecting hole.

[0029] The inner end face of the drain valve stem and the drain hole form a drain chamber, and the drain chamber is connected to the sealing oil chamber; the throttling section is connected to the drain chamber through the second connecting hole; a steel ball 10 is provided between the second connecting hole and the drain chamber.

[0030] In one embodiment, the oil return hole is a two-stage stepped hole, including a sealing section for inserting a throttle valve screw and a throttling section for placing a throttle pin. The diameter of the sealing section is larger than the diameter of the throttle section. The throttle valve screw is coaxially inserted into the sealing section of the oil return hole from the outside to the inside, and the two are sealed and screwed together. The throttle pin is coaxially inserted into the throttle section of the oil return hole, and a throttling gap is left between the throttle pin and the throttle section. The throttle pin can move axially along the throttle section, wherein the end face of the throttle pin can block the stepped end face of the oil return cavity of the throttle valve screw. The inner end face of the throttle pin is provided with a throttling groove. One end of the return spring is connected to the upper end face of the throttle pin, and the other end is connected to the inner end face of the oil return cavity.

[0031] In one embodiment, the throttle valve screw 9 is coaxially arranged with the throttle pin 8.

[0032] In one embodiment, a sealing ring is provided between the throttle valve screw 9 and the valve body 2.

[0033] Furthermore, a protective sleeve 9 is fitted onto the pump body 5.

[0034] In one embodiment, a universal joint component 8 is provided at the upper end of the drain valve stem 6.

[0035] When the hydraulic cylinder system of this utility model is working normally, the drain valve is closed, the pressure oil in the cylinder is disconnected from the throttle valve, and the throttle valve is in a zero-pressure state. When the drain valve is opened and the hydraulic cylinder unloads oil, the hydraulic oil 12 flows directly back to the oil tank through the throttle valve. At this time, the pressure on the throttle valve is also extremely low, that is, the throttle valve is always in a zero-pressure or low-pressure state.

[0036] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An improved hydraulic pump system, comprising an outer sleeve (1), a valve body (2), a pump body (5) cooperating with the valve body (2), a pump core (7), and a cylinder (3) with a piston rod (4), wherein the outer sleeve (1) is coaxially fitted outside the cylinder (3) and fixed to the cylinder (3) by a top cap (11); an oil storage chamber is formed between the outer sleeve (1) and the cylinder (3), and a sealed oil chamber is formed between the piston installed at the insertion end of the piston rod (4) and the cylinder (3); the valve body (2) is installed at the end of the outer sleeve (1), and the pump core is inserted into the inner cavity of the pump body (5) and is slidably connected thereto; a drain valve rod (6) is installed on the valve body (2), and the drain valve rod (6) is installed in the drain hole of the valve body (2), characterized in that, A throttle valve (13) is installed in the oil storage chamber between the outer sleeve (1) and the oil cylinder (3). The throttle valve (13) is located between the drain valve (14) and the oil tank. The throttle valve (13) is installed in the return oil hole of the valve body (2). The throttle valve (13) includes a throttle pin, a throttle valve screw and a return spring. The inner end face of the throttle valve screw is provided with an oil return chamber, which is connected to the oil storage chamber through a first connecting hole. The inner end face of the drain valve stem and the drain hole form a drain chamber, and the drain chamber is connected to the sealing oil chamber; the throttling section is connected to the drain chamber through the second connecting hole; a steel ball (10) is provided between the second connecting hole and the drain chamber.

2. The improved hydraulic pump system as described in claim 1, characterized in that, The return oil hole is a two-stage stepped hole, including a sealing section for inserting a throttle valve screw and a throttling section for placing a throttle pin. The diameter of the sealing section is larger than the diameter of the throttle section. The throttle valve screw is coaxially inserted into the sealing section of the return oil hole from the outside to the inside, and the two are sealed and screwed together. The throttle pin is coaxially inserted into the throttle section of the return oil hole, and a throttling gap is left between the throttle pin and the throttle section. The throttle pin can move axially along the throttle section, wherein the end face of the throttle pin can block the stepped end face of the return oil cavity of the throttle valve screw. The inner end face of the throttle pin is provided with a throttling groove. One end of the return spring is connected to the upper end face of the throttle pin, and the other end is connected to the inner end face of the return oil cavity.

3. An improved hydraulic pump system as described in claim 2, characterized in that, The throttle valve screw is coaxially arranged with the throttle pin.

4. An improved hydraulic pump system as described in claim 3, characterized in that, A sealing ring is provided between the throttle valve screw and the valve body.

5. An improved hydraulic pump system as described in claim 1, characterized in that, The pump body is fitted with a protective sleeve.

6. An improved hydraulic pump system as described in claim 1, characterized in that, The upper end of the drain valve stem is provided with a universal joint component.

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