Bidirectional throttle valve device for controlling bidirectional hydraulic jar

Abstract

The utility model discloses a two-way throttle valve device for controlling a two-way hydraulic jar, which is characterized in that a valve body is axially provided with a drainage channel hole penetrating through two end surfaces of the valve body, the drainage channel hole comprises a valve needle hole in the middle, a valve needle is arranged in the valve needle hole, the valve needle hole consists of an upper striking valve needle hole and a lower striking valve needle hole, and the upper striking valve needle hole is communicated with the lower striking valve needle hole. The upper striking valve needle hole and the lower striking valve needle hole are different in hole diameter. According to the single-cavity two-way jar, the drainage channel hole penetrating through the two end faces is formed in the valve body and comprises the lower striking valve needle hole and the upper striking valve needle hole which are different in size, and only one valve needle is arranged in the valve needle hole, so that two-way throttling flow can be adjusted respectively, and control over different upper striking force and lower striking force of the single-cavity two-way jar is achieved. The bidirectional hydraulic jar is simple in structure, the single valve body has the bidirectional jar function of controlling the upward jar and the downward jar of the bidirectional hydraulic jar, the jar delay of the upward jar and the downward jar can be independently adjusted, the number of parts of the bidirectional hydraulic jar and the total length of tools are reduced, the manufacturing cost is reduced, and the bidirectional hydraulic jar is convenient to maintain.

Description

Technical Field

[0001] This utility model relates to a throttle valve device, and more particularly to a bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber. Background Technology

[0002] Existing bidirectional hydraulic shock absorbers all have bidirectional throttling functions, but the upper and lower shock structures are basically controlled by two hydraulic cavities. There are two basic mechanisms for controlling the bidirectional shock force of the upper and lower shocks. One is to control the shock force by slit leakage through a shaft hole, with the shock piston and valve core or valve body and valve needle (valve core) structure. The outer circle of the piston (valve body) is press-fitted with the outer cylinder hole, and the inner hole of the piston is press-fitted with the outer circle of the core shaft for sealing, or the inner hole of the piston (valve core) is chamfered and sealed with the core shaft. For example, CN 217481224U is a valve core with a chamfered inner hole and a core shaft sealing fit, and the outer circle of the valve core is press-fitted for sealing; application number 202021456249.0 is a delay mechanism for hydraulic shock absorbers and a self-cleaning hydraulic shock absorber; application number 202123105879.0 is a throttling valve for shock absorbers with shaft hole leakage through sealing of the outer cylindrical surface and the end. Another method involves controlling the impact force through a gap in the valve body's end face, such as the energy storage device for a hydraulic shocker (application number 2022117240505). The application requirements of bidirectional hydraulic shockers and the petroleum industry standard SY / T 5496-2017 stipulate that the impact force and delay differ between upward and downward impacts, with the upward impact force being significantly greater than the downward impact force—more than twice the latter. Therefore, the bidirectional (upward and downward) impact control of existing bidirectional hydraulic shockers is essentially achieved in two different hydraulic cavities. Even the existing patented technology, such as the single-cavity double-stroke shocker (application number 202411125050.2), actually uses two sets of oil injection holes and oil outlet holes to inject oil into the upper and lower high-pressure zones separately, ensuring a single-cavity oil injection effect but not a true single-cavity system. Therefore, bidirectional shock absorbers basically use two valve body assemblies to achieve bidirectional shock force in two hydraulic stroke chambers, namely (valve body and valve core (valve needle) or piston and valve needle / filter element flow control assembly). The valve body assembly is a high-cost part and there are many parts in the two hydraulic chambers. The tools for assembling the shock absorber are long, which increases the manufacturing cost and makes maintenance and disassembly cumbersome. Summary of the Invention

[0003] The purpose of this invention is to provide a bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber. This device provides a single-chamber throttle valve that can control different upper and lower impact forces, enabling single-chamber control of different upper and lower impact forces.

[0004] The technical solution of this utility model is as follows: a bidirectional throttling valve device for controlling a bidirectional hydraulic shock absorber, comprising a cylindrical valve body, wherein the valve body is provided with a discharge channel hole through both ends of the valve body along its axial direction, the discharge channel hole includes a valve needle hole in the middle, a valve needle is provided in the valve needle hole, the valve needle hole is composed of an upper valve needle hole and a lower valve needle hole, the upper valve needle hole and the lower valve needle hole have different diameters.

[0005] In the aforementioned bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber, the discharge channel hole further includes a filter element mounting hole and a screw plug mounting hole respectively disposed on the outer ends of the upper shock valve needle hole and the lower shock valve needle hole, wherein a filter element and a hollow screw plug are respectively disposed in the filter element mounting hole and the screw plug mounting hole.

[0006] In the aforementioned bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber, both screw plug mounting holes are radially provided with vent holes that communicate with the outside. The vent holes are divided into an upper vent hole and a lower vent hole.

[0007] In the aforementioned bidirectional throttling valve device for controlling a bidirectional hydraulic shock absorber, a sealing cylindrical boss is provided on each of the valve body near both end faces, and the outer diameter of the sealing cylindrical boss is larger than the outer diameter of the valve body on both sides.

[0008] In the aforementioned bidirectional throttling valve device for controlling a bidirectional hydraulic shocker, the outer wall of the valve body between two sealing cylindrical bosses forms a central flow surface. Multiple pressure balance holes are provided on the outer periphery of the valve body at the central flow surface. The pressure balance holes are connected to the inner hole of the valve body. Multiple axially penetrating semi-circular groove fluid flow channels are provided on the inner wall of the valve body.

[0009] In the aforementioned bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber, the sealing cylindrical boss and the valve bodies on both sides are transitioned by a small conical angle surface.

[0010] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model, by setting a venting channel hole that runs through both ends of the valve body, and including venting channel holes containing downward-impact valve needle holes and upward-impact valve needle holes of different sizes, and setting only one valve needle in the valve needle hole, can adjust the bidirectional throttling flow rate separately, thereby realizing the control of different upward and downward impact forces of the single-cavity bidirectional shocker. This utility model has a simple structure, and a single valve body has the bidirectional shock function of controlling the upward and downward impacts of the bidirectional hydraulic shocker. At the same time, the shock delay of the upward and downward impacts can be adjusted independently, reducing the number of parts and the total length of the tool in the bidirectional hydraulic shocker, reducing manufacturing costs, and facilitating maintenance. Attached Figure Description

[0011] Figure 1 It is a structural diagram of the utility model;

[0012] Figure 2 for Figure 1 A schematic diagram of the side structure;

[0013] Figure 3 This is a schematic diagram of the valve body.

[0014] Reference numerals: 1-Valve body, 2-Valve needle, 3-Filter element, 4-Hollow screw plug, 5-Upper drain hole, 6-Lower drain hole, 7-Drainage channel hole, 7-1-Screw plug mounting hole, 7-2-Filter element mounting hole, 7-3-Lower valve needle hole, 7-4-Upper valve needle hole, 8-Semi-circular groove fluid flow channel, 9-Pressure balance hole, 10-Central flow surface, 11-Sealing cylindrical boss. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0016] An embodiment of this utility model: A bidirectional throttling valve device for controlling a bidirectional hydraulic shock absorber includes a cylindrical valve body 1. The valve body 1 has a discharge channel hole 7 extending through both ends of the valve body 1 along its axial direction. The discharge channel hole 7 includes a valve needle hole in the middle. A valve needle 2 is provided in the valve needle hole. The valve needle hole is composed of an upper valve needle hole 7-4 and a lower valve needle hole 7-3. The upper valve needle hole 7-4 and the lower valve needle hole 7-3 have different diameters.

[0017] This device mainly consists of a valve body 1, a valve needle 2, a filter element 3, and a hollow screw plug 4. It is installed into the pressure chamber of a bidirectional hydraulic shock absorber, and works in conjunction with the outer cylinder and spindle of the shock absorber to control its upward and downward impact movements. The impact force and pressure holding time differ between the upward and downward movements. The filter element 3 and the hollow screw plug 4 are symmetrically arranged on the valve body 1, which is the main component. Because the diameters of the upward-impact valve needle hole 7-4 and the downward-impact valve needle hole 7-3 are different, the gap between the valve needle 2 and different valve needle holes varies when the valve needle 2 is located in different needle holes, thus controlling different impact forces.

[0018] The venting channel hole 7 also includes a filter element mounting hole 7-2 and a screw plug mounting hole 7-1 respectively located on the outer ends of the upper valve needle hole 7-4 and the lower valve needle hole 7-3. A filter element 3 and a hollow screw plug 4 are respectively installed in the filter element mounting hole 7-2 and the screw plug mounting hole 7-1. Both screw plug mounting holes 7-1 have radially arranged venting holes communicating with the outside, which are divided into an upper venting hole 5 and a lower venting hole 6. Specifically, the two ends of the venting channel hole 7 have a stepped hole structure with large and small holes. The larger hole has internal threads for installing the hollow screw plug 4, and the smaller hole inside the larger hole is for installing the filter element 3.

[0019] The hollow screw plug 4 has an internal hexagonal hole at one end, with a small hole in the middle through the plug. The hollow screw plug 4 is connected to the valve body 1 by an external thread.

[0020] The filter element 3 has a mesh cylindrical structure, which can filter impurities in the hydraulic chamber and ensure that the valve needle 2 works normally in the valve body 1.

[0021] Each of the valve body 1 has a sealing cylindrical boss 11 located near both end faces on its outer periphery. The outer diameter of the sealing cylindrical boss 11 is larger than the outer diameter of the valve body 1 on both sides. The two sealing cylindrical bosses 11 form sealing surface A and sealing surface B, respectively. The purpose of setting the two sealing cylindrical bosses 11 is to reduce the sealing contact area due to pressure build-up from above and below.

[0022] The outer wall of the valve body 1 between the two sealing cylindrical bosses 11 forms a central flow surface 10. Multiple pressure balance holes 9 are provided on the outer periphery of the valve body 1 at the central flow surface 10. These pressure balance holes 9 communicate with the inner bore of the valve body 1. Multiple axially penetrating semi-circular groove fluid flow channels 8 are provided on the inner wall of the valve body 1. The semi-circular groove fluid flow channels 8 are used for the left and right flow of fluid in the hydraulic chamber. The function of the pressure balance holes 9 is as follows: When the double-acting shock absorber performs upward and downward shock-absorbing movements, the sealing surfaces A / B of the sealing cylindrical bosses 11 are pressurized. The pressure balance holes 9 balance the pressure between the high-pressure chamber and the pressurized valve body 1, thus achieving pressure balance on the central flow surface 10. This prevents the valve body 1 from pressurizing and vibrating, ensuring smooth movement of the valve body 1.

[0023] The upper and lower end faces of the valve body 1 are flat and require a high surface roughness, generally set to a roughness of 0.8 or higher. The sealing cylindrical bosses 11 at both ends of the valve body 1 form sealing surfaces A and B. Small conical angle surfaces are provided on the left and right sides of the sealing cylindrical bosses 11 to facilitate the navigation transition when the valve body 1 moves up and down. The edges where the small conical angles intersect with the sealing cylindrical bosses 11 are chamfered and polished.

Claims

1. A bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber, characterized in that: The valve body (1) is cylindrical. The valve body (1) has a discharge channel hole (7) that passes through both ends of the valve body (1) along its axial direction. The discharge channel hole (7) includes a valve needle hole in the middle. A valve needle (2) is provided in the valve needle hole. The valve needle hole is composed of an upper valve needle hole (7-4) and a lower valve needle hole (7-3). The diameters of the upper valve needle hole (7-4) and the lower valve needle hole (7-3) are different.

2. The bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber according to claim 1, characterized in that: The drain channel hole (7) also includes a filter element mounting hole (7-2) and a screw plug mounting hole (7-1) respectively located on the outer ends of the upper valve needle hole (7-4) and the lower valve needle hole (7-3). A filter element (3) and a hollow screw plug (4) are respectively installed in the filter element mounting hole (7-2) and the screw plug mounting hole (7-1).

3. The bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber according to claim 2, characterized in that: Both screw plug mounting holes (7-1) are radially provided with vent holes that communicate with the outside. The vent holes are divided into an upper vent hole (5) and a lower vent hole (6).

4. The bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber according to claim 1, characterized in that: The valve body (1) is provided with a sealing cylindrical boss (11) at each end face near the outer periphery of the valve body (1). The outer diameter of the sealing cylindrical boss (11) is larger than the outer diameter of the valve body (1) on both sides.

5. A bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber according to claim 4, characterized in that: The outer wall of the valve body (1) between the two sealing cylindrical bosses (11) forms a central flow surface (10). Multiple pressure balance holes (9) are provided on the outer periphery of the valve body (1) at the central flow surface (10). The pressure balance holes (9) are connected to the inner hole of the valve body (1). Multiple axially penetrating semi-circular groove liquid flow channels (8) are provided on the inner wall of the valve body (1).

6. A bidirectional throttle valve device for controlling a bidirectional hydraulic shock absorber according to claim 4, characterized in that: The sealing cylindrical boss (11) and the valve bodies (1) on both sides are transitioned by a small conical surface.

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