Bypass valve opening pressure testing device

Abstract

The utility model discloses a bypass valve opening pressure testing device which comprises a base, the base is fixedly connected with a vertical plate upwards, the A surface of the vertical plate is fixedly connected with a supporting frame, the supporting frame is connected with a pressing cylinder through a linear motion structure, and the pressing cylinder is used for containing a tested bypass valve and is communicated with an inlet of the bypass valve. The side wall of the pressing cylinder is connected with a liquid inlet; a mounting hole is formed in the face A of the vertical plate, a mounting ring is arranged at the mounting hole, the radial inner end of the mounting ring protrudes towards the face B and is inserted into the mounting hole, and the mounting ring is fixedly connected with the vertical plate through a bolt; a sealing ring is embedded in the mounting ring in the A surface direction; the sealing ring, the mounting hole and the mounting ring are coaxial. The sealing ring is used for being in tight pressing fit with the end face of the pressing cylinder to form sealing. The structure is compact, the occupied space is small, two hands can conveniently operate the pressing piece and the bypass valve at the same time, the testing efficiency is improved, and the testing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of production of hydraulic filter bypass valves, and particularly to a bypass valve opening pressure testing device. Background Art

[0002] In the automotive industry, a hydraulic filter is a component for filtering hydraulic oil and plays an important role in ensuring the normal operation of the automotive hydraulic system.

[0003] During cold start, the filter resistance of the filter element to hydraulic oil is very high. During long-term use, as more and more impurities accumulate in the filter element, the filter element of the hydraulic filter will become increasingly blocked, and the filter resistance of the filter element to hydraulic oil will gradually increase.

[0004] When the filter resistance is high due to cold start or blockage, it is difficult for hydraulic oil to pass through the filter element smoothly. At this time, the bypass valve can ensure the smoothness of the hydraulic oil circuit and thus ensure the normal operation of the hydraulic system.

[0005] If the opening pressure of the bypass valve is too high, when the filter resistance of the filter element is high due to cold start or blockage, the bypass valve cannot be opened normally and cannot effectively ensure the normal operation of the hydraulic system.

[0006] If the opening pressure of the bypass valve is too low, the bypass valve may open when the filter element can still pass oil normally, resulting in unfiltered hydraulic oil flowing downstream and bringing impurity hazards to the hydraulic system.

[0007] Therefore, before the bypass valve leaves the factory, it is necessary to test its opening pressure to ensure that the opening pressure of the bypass valve is within a suitable range and can match the blockage pressure of a filter element of a specific model.

[0008] The common bypass valve testing method is realized by processing a set of outer shells and fixing them by threaded connection and radial sealing with a sealing ring. This often results in a large diameter of the tooling. When the operator actually operates, due to the influence of hydraulic oil, it is inconvenient to disassemble and assemble the tooling and replace the test piece, resulting in a long working time and waste of resources. Content of the Utility Model

[0009] The purpose of the utility model is to provide a bypass valve opening pressure testing device, which has a compact structure, occupies a small space, is convenient for operating the pressing member and the bypass valve with both hands simultaneously, and improves the testing efficiency.

[0010] To achieve the above purpose, the bypass valve opening pressure testing device of the utility model includes a base, a vertical plate is fixedly connected upward to the base, and the two side surfaces of the vertical plate are respectively surface A and surface B.

[0011] A support frame is fixedly connected to surface A of the vertical plate, the support frame is connected with a pressure cylinder through a linear motion structure, the pressure cylinder is used for accommodating the bypass valve to be tested and communicating with the inlet of the bypass valve; a liquid inlet is connected to the side wall of the pressure cylinder, and the liquid inlet is used for connecting an external hydraulic oil source.

[0012] The A side of the vertical plate is provided with mounting holes, and mounting rings are arranged at the mounting holes. The radially inner end of the mounting ring protrudes towards the B side and is inserted into the mounting hole. The outer diameter of the mounting ring is larger than the outer diameter of the mounting hole, and the mounting ring is fixedly connected to the vertical plate by bolts; on the A side, the mounting ring is recessed with an annular sealing groove, and a sealing ring protruding from the sealing groove is embedded in the sealing groove;

[0013] The sealing ring, the mounting hole and the mounting ring are all coaxial. The diameter of the sealing ring matches the diameter of the pressing cylinder. The sealing ring is used for tightly pressing and mating with the end face of the pressing cylinder to form a seal.

[0014] The linear motion structure includes a screw rod, and the screw rod is in threaded cooperation with the support frame; the screw rod is coaxial with the mounting hole. One end of the screw rod facing the vertical plate is provided with an annular sliding groove along the circumferential direction. One end of the pressing cylinder facing the screw rod protrudes with a connecting portion, and a connecting groove is provided in the center of the connecting portion. The annular sliding groove extends into the connecting groove; a limit bolt is fixedly connected to the connecting portion, and the limit bolt extends radially into the annular sliding groove; the other end of the screw rod extends out of the support frame and is connected with a handle;

[0015] A guiding slide bar parallel to the screw rod is arranged in the support frame. One end of the guiding slide bar is fixedly connected to the vertical plate and the other end is fixedly connected to the support frame; one side of the pressing cylinder is connected with a guiding slider, and the guiding slide bar passes through the guiding slider and is in sliding cooperation with the guiding slider.

[0016] The base is arranged in the recycling container; the support frame is connected to the top of the support frame and is higher than the recycling container.

[0017] The utility model has the following advantages:

[0018] The structure of the utility model is simple. The bypass valve to be tested is installed at the central hole of the mounting ring or in the pressing cylinder. Through the linear motion mechanism, it is very easy to tightly press the pressing cylinder on the sealing ring. At this time, the oil outlet of the bypass valve is exposed on the B side of the vertical plate, and the oil inlet of the bypass valve communicates with the inner cavity of the pressing cylinder. Hydraulic oil is input into the inner cavity of the pressing cylinder through the liquid inlet, and the pressure is gradually increased from low to high until the bypass valve opens, and then the opening pressure of the bypass valve can be conveniently confirmed (the test pressure when the oil comes out from the B side is the opening pressure of the bypass valve to be tested). During use, the staff can install the bypass valve with one hand and operate the linear motion mechanism to drive the pressing part (i.e., the pressing cylinder) with the other hand. The operation of disassembling and assembling the bypass valve and replacing the test piece has greatly improved the operation efficiency and reduced the test cost compared with the past. If higher operation efficiency is pursued, a motor controlled by a button can be used to replace manual operation of the linear motion mechanism.

[0019] The limiting bolt extends radially into the annular sliding groove, enabling it to be constrained by the annular sliding groove axially and move in the same direction as the screw rod, and not being constrained circumferentially, so that when the pressing cylinder is axially driven by the screw rod, it does not need to rotate circumferentially with the screw rod. During use, only by rotating the screw rod forward or backward through the handle, the pressing cylinder can be driven to press against the vertical plate or move away from the vertical plate.

[0020] The guiding slide rod restricts the pressing cylinder from rotating circumferentially through the guiding slider, and together with the screw rod, it realizes the movement state that the pressing cylinder can move axially while being fixed circumferentially, avoiding damage to the sealing ring and seal failure caused by circumferential rotation when pressing tightly on the sealing ring.

[0021] The base is placed in the recovery container, and the hydraulic oil leaked when replacing the test piece is accommodated by the recovery container. The hydraulic oil can be reused, which not only avoids polluting the environment, but also reduces the amount of hydraulic oil used in the test and lowers the test cost. The support frame is higher than the recovery container, facilitating the operation of the operator. Brief Description of the Drawings

[0022] Figure 1 is the top view structural schematic diagram of the present utility model.

[0023] Figure 2 is Figure 1 the A-A cross-sectional view of

[0024] Figure 3 is the three-dimensional structural schematic diagram of the present utility model in the state where the pressing cylinder presses on the vertical plate and the sealing ring. In this state, hydraulic oil can be introduced to test the bypass valve.

[0025] Figure 4 is the three-dimensional structural schematic diagram of the present utility model in the state where the pressing cylinder moves away from the vertical plate. In this state, the bypass valve can be disassembled and assembled.

[0026] Figure 5 is Figure 2 the enlarged view of part A in Detailed Description of the Embodiment

[0027] As Figures 1 to 5 shown, the bypass valve opening pressure testing device of the present utility model includes a base 1, a vertical plate 2 is fixedly connected upward to the base 1, and the two side surfaces of the vertical plate 2 are respectively surface A and surface B;

[0028] A support frame 3 (in a U shape in the top view direction) is fixedly connected to surface A of the vertical plate 2. The support frame 3 is connected to a pressing cylinder 4 through a linear motion structure. The pressing cylinder 4 is used to accommodate the bypass valve 5 to be tested and communicate with the inlet of the bypass valve 5; a liquid inlet 6 is connected to the side wall of the pressing cylinder 4. The liquid inlet 6 is used to connect to an external hydraulic oil source through a hose, such as connecting to the outlet of an oil pump, and the inlet of the oil pump communicates with a hydraulic oil container; the hydraulic oil source such as an oil pump is a conventional technology and is not shown in the figure.

[0029] The A side of the vertical plate 2 is provided with mounting holes, and a mounting ring 7 is provided at the mounting holes. The radially inner end of the mounting ring 7 protrudes towards the B side and is inserted into the mounting holes (this structure facilitates the assembly of the mounting ring 7 at the mounting holes). The outer diameter of the mounting ring 7 is larger than the outer diameter of the mounting holes, and the mounting ring 7 is fixedly connected to the vertical plate 2 by bolts; on the A side, the mounting ring 7 is recessed with an annular sealing groove, and a sealing ring 8 protruding from the sealing groove is embedded in the sealing groove; the spatial positions of the mounting holes and the mounting ring overlap, and in order to avoid messy lines, the mounting holes are not indicated in the figure.

[0030] The sealing ring 8, the mounting holes and the mounting ring 7 are all coaxial. The sealing ring 8 is matched with the diameter of the pressure cylinder 4, and the sealing ring 8 is used for tightly pressing and fitting with the end face of the pressure cylinder 4 to form a seal.

[0031] The bypass valve 5 is connected with a sealing plate 9. After the bypass valve 5 is installed on the mounting ring 7, the sealing plate 9 closes the B-side outlet of the mounting ring 7.

[0032] The structure of the present utility model is simple. The bypass valve 5 to be tested is installed at the central hole of the mounting ring 7 or inside the pressure cylinder 4. Through the linear motion mechanism, it is very easy to tightly press the pressure cylinder 4 on the sealing ring 8. At this time, the oil outlet of the bypass valve 5 is exposed on the B side of the vertical plate 2, and the oil inlet of the bypass valve 5 communicates with the inner cavity of the pressure cylinder 4. Hydraulic oil is input into the inner cavity of the pressure cylinder 4 through the liquid inlet 6 and gradually pressurized from low to high until the bypass valve 5 opens, and then the opening pressure of the bypass valve 5 can be conveniently confirmed (the test pressure when oil flows out from the B side is the opening pressure of the bypass valve 5 to be tested). During use, the operator can install the bypass valve 5 with one hand and operate the linear motion mechanism with the other hand. The operation of disassembling and installing the bypass valve 5 and replacing the test piece has greatly improved the operation efficiency compared with the past. If higher operation efficiency is pursued, a motor controlled by a button can be used to replace the manual operation of the linear motion mechanism.

[0033] The linear motion structure includes a screw rod 11, and the screw rod 11 is in threaded cooperation with the support frame 3; the screw rod 11 is coaxial with the mounting holes. One end of the screw rod 11 facing the vertical plate 2 is provided with an annular sliding groove 10 along the circumferential direction. One end of the pressure cylinder 4 facing the screw rod 11 protrudes with a connecting portion 12, and a connecting groove 13 is provided at the center of the connecting portion 12. The annular sliding groove 10 extends into the connecting groove 13; a limiting bolt 14 is fixedly connected to the connecting portion 12, and the limiting bolt 14 extends radially into the annular sliding groove 10; the other end of the screw rod 11 extends out of the support frame 3 and is connected with a handle 15;

[0034] A guiding slide bar 16 parallel to the screw rod 11 is arranged inside the support frame 3. One end of the guiding slide bar 16 is fixedly connected to the vertical plate 2 and the other end is fixedly connected to the support frame 3; one side of the pressure cylinder 4 is connected with a guiding slider 17, and the guiding slide bar 16 passes through the guiding slider 17 and is in sliding cooperation with the guiding slider 17. The guiding slide bar 16 is blocked by the support frame 3 in the three-dimensional view and is not shown in the three-dimensional view.

[0035] The limiting bolt 14 extends radially into the annular chute 10, realizing that it is axially constrained by the annular chute 10 and moves in the same direction as the screw rod 11, and is not circumferentially constrained, so that when the pressing cylinder 4 is axially driven by the screw rod 11, it does not need to rotate circumferentially with the screw rod 11. During use, only by rotating the screw rod 11 forward or backward through the handle 15, the pressing cylinder 4 can be driven to press against the vertical plate 2 or move away from the vertical plate 2.

[0036] The guiding slide rod 16 restricts the pressing cylinder 4 from rotating circumferentially through the guiding slider 17, and together with the screw rod 11, realizes the movement state that the pressing cylinder 4 can move axially while being circumferentially fixed, avoiding damage to the sealing ring 8 and seal failure caused by circumferential rotation when pressing tightly on the sealing ring 8.

[0037] The base 1 is arranged in the recovery container; the support frame 3 is connected to the top of the support frame 3 and is higher than the recovery container. The recovery container is a conventional container, not shown in the figure.

[0038] The base 1 is placed in the recovery container, and the hydraulic oil leaked during the replacement of the test piece is all contained by the recovery container. The hydraulic oil can be reused, which not only avoids polluting the environment, but also reduces the amount of hydraulic oil used in the test and lowers the test cost. The support frame 3 is higher than the recovery container, which is convenient for the operator to operate.

[0039] During use, fix the recovery container on the workbench, place the base 1 in the recovery container, and the support frame 3 is higher than the recovery container. Therefore, it is convenient for the operator to operate the handle 15 and the bypass valve 5 to be tested at the support frame 3. Connect the liquid inlet 6 and the external hydraulic oil source with the oil supply hose. The hydraulic oil source is usually an oil pump, and the oil inlet end of the oil pump is connected to the hydraulic oil container; if the liquid level in the recovery container is sufficient, the oil inlet end of the oil pump can also be connected to the recovery container, but it should be noted that a filter is set at the oil inlet end of the oil pump to prevent impurities from entering the recovery container.

[0040] The operator positions the bypass valve 5 in the mounting ring 7 with one hand, and the sealing plate 9 closes the outlet on the B side of the mounting ring 7, so that the hydraulic oil can only flow out through the oil outlet end of the bypass valve 5 during the test. The oil outlet end of the bypass valve 5 is exposed on the B side of the vertical plate 2, and the oil inlet end of the bypass valve 5 faces the pressing cylinder 4. The operator rotates the handle 15 with the other hand, so that the pressing cylinder 4 advances towards the vertical plate 2 and the sealing ring 8. Under the constraint of the guiding slide rod 16, the pressing cylinder 4 can only move axially and will not rotate circumferentially. The operator rotates the handle 15 until the pressing cylinder 4 presses tightly on the sealing ring 8. Start the oil pump (it can be a variable-frequency oil pump), inject hydraulic oil into the pressing cylinder 4 and gradually increase the pressure from low to high. When the oil starts to flow out from the oil outlet end of the bypass valve 5 on the B side of the vertical plate 2, the oil pressure of the oil pump at this time is the opening pressure of the bypass valve 5. When the opening pressure of the bypass valve 5 is within the set qualified opening pressure range, the bypass valve 5 is a qualified product. When the opening pressure of the bypass valve 5 is higher than or lower than the set qualified opening pressure range, the bypass valve 5 is a non-conforming product.

[0041] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the present invention, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims

1. Bypass valve opening pressure testing device, comprising a base, a vertical plate fixedly connected upward to the base, with the two side surfaces of the vertical plate being surface A and surface B respectively, characterized in that: A support frame is fixedly connected to surface A of the vertical plate. The support frame is connected to a pressing cylinder through a linear motion structure. The pressing cylinder is used to accommodate the bypass valve to be tested and is communicated with the inlet of the bypass valve; a liquid inlet is connected to the side wall of the pressing cylinder, and the liquid inlet is used to connect an external hydraulic oil source; An installation hole is provided on surface A of the vertical plate. An installation ring is provided at the installation hole. The radially inner end of the installation ring protrudes towards surface B and is inserted into the installation hole. The outer diameter of the installation ring is larger than the outer diameter of the installation hole. The installation ring is fixedly connected to the vertical plate through bolts; on surface A, the installation ring is recessed with an annular sealing groove, and a sealing ring protruding from the sealing groove is embedded in the sealing groove; The sealing ring, the installation hole and the installation ring are all coaxial. The sealing ring matches the diameter of the pressing cylinder, and the sealing ring is used to tightly press-fit with the end face of the pressing cylinder to form a seal.

2. The bypass valve opening pressure test device according to claim 1, characterized in that: The linear motion structure includes a screw rod, which is in threaded cooperation with the support frame; the screw rod is coaxial with the installation hole. One end of the screw rod facing the vertical plate is provided with an annular chute along the circumference. One end of the pressing cylinder facing the screw rod protrudes with a connecting portion, and a connecting groove is provided at the center of the connecting portion. The annular chute extends into the connecting groove; a limit bolt is fixedly connected to the connecting portion, and the limit bolt extends radially into the annular chute; the other end of the screw rod extends out of the support frame and is connected with a handle; A guide slide bar parallel to the screw rod is provided inside the support frame. One end of the guide slide bar is fixedly connected to the vertical plate and the other end is fixedly connected to the support frame; one side of the pressing cylinder is connected with a guide slider, and the guide slide bar passes through the guide slider and is in sliding cooperation with the guide slider.

3. The bypass valve opening pressure test device according to claim 1, wherein: The base is arranged in a recovery container; the support frame is connected to the top of the support frame and is higher than the recovery container.

Images