A pilot filter element air tightness test device

Abstract

The utility model discloses a pilot filter element air tightness inspection device, comprising a base plate and a support column fixed on the base plate, a positioning groove is arranged on the top of the support column, a U-shaped groove is arranged on both sides of the upper end of the positioning groove, a door-shaped groove extending in the same direction as the U-shaped groove is arranged on the bottom of the support column, a bidirectional double-axis cylinder is installed in the door-shaped groove on the base plate, and the cylinder shafts at both ends of the bidirectional double-axis cylinder are installed with pressure plates, the upper end of the pressure plate is arranged on the outside of the U-shaped groove adjacent to it, a plug is installed on the upper end of the pressure plate, an air cavity is arranged in the middle of the plug, the inner end of the air cavity is arranged to be open, and a cover plate is arranged on the outer end, an air pressure sensor is inserted into one of the cover plates, an air charging tube is arranged on the other cover plate, a pressure cap with an outer diameter larger than the outer diameter of the plug is fixed on the inner end of the plug, and a sealing gasket is arranged on the end face of the pressure cap. The pilot filter element air tightness inspection device is simple to operate and is convenient for inspecting the sealing of the left-in and right-out filter.

Description

Technical Field

[0001] The utility model relates to an airtightness testing device, in particular to an airtightness testing device for a pilot filter element. Background Art

[0002] Pilot element filter, also known as pilot filter, is commonly used in mechanical and industrial systems. It is mainly used as a pre-filter to reduce the pressure and impact on the subsequent filtration system by preliminary filtering of the fluid, thereby protecting the equipment and extending its service life. The role of the pilot filter is to filter and collect impurities, especially in the pilot system of equipment such as excavators. The pilot filter filters the impurities in the hydraulic oil of the pilot system to ensure that the low-pressure system can smoothly control and operate the entire high-pressure system. This is very important for the operation of the entire excavator, because the pilot system is a low-pressure system that plays a controlling role. Therefore, the pilot filter plays an indispensable role in mechanical and industrial systems.

[0003] Pilot element filters can be divided into top-in and bottom-out, top-in and top-out, bottom-in and bottom-out, left-in and left-out, right-in and right-out, left-in and right-out, or top-in and side-out according to the position distribution of the inlet and outlet pipes. In order to facilitate the replacement of the filter element inside the filter, a cover structure needs to be provided at the end of the filter. The sealing performance between the cover structure and the filter body affects the overall use of the filter. Therefore, it is necessary to test the sealing performance of the pilot element filter.

[0004] Chinese patent CN201710757357.8 discloses a dry-type air tightness tester for a filter, comprising an operating table; a lifting and rotating device arranged on the operating table, used to lift and rotate the filter; a gas conveying mechanism connected to the lifting and rotating device, used to introduce gas into the filter; a micro-pressure detection device fixedly connected to the operating table, used to press the filter and perform air tightness detection on the outer wall of the rotating filter. The dry-type air tightness tester can only test the air tightness of end-in and end-out filters, and it is difficult to test the air tightness of left-in and right-out filters. Utility Model Content

[0005] The utility model aims to provide an airtightness testing device for a pilot filter element, which is easy to operate and convenient for testing the sealing performance of a left-inlet and right-outlet filter.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an airtight inspection device for a pilot filter element, which comprises a base plate and a support column fixedly connected to the base plate, the top of the support column is provided with a positioning groove, and both sides of the upper end of the positioning groove are respectively provided with a U-shaped groove, and the bottom of the support column is provided with a door-shaped groove extending in the same direction as the U-shaped groove, a two-way double-axis cylinder is installed on the base plate and located in the door-shaped groove, and the cylinder shafts at both ends of the two-way double-axis cylinder are both provided with a pressure plate, the upper end of the pressure plate is arranged on the outer side of the U-shaped groove adjacent to it, and a plug is installed on the upper end of the pressure plate, an air cavity is arranged in the middle of the plug, the inner end of the air cavity is arranged to be open, and a cover plate is arranged on the outer end, an air pressure sensor is inserted into one of the cover plates, and an inflation tube is arranged on the other cover plate, the inner end of the plug is fixedly connected with a pressure cover whose outer diameter is larger than the outer diameter of the plug, and a sealing gasket is arranged on the end face of the pressure cover.

[0007] Preferably, a screw having a diameter smaller than that of the cylinder shaft is provided at the outer end of the cylinder shaft, a first through hole capable of being sleeved on the screw is provided at the lower end of the pressure plate, and a first nut for locking the pressure plate is installed on the outer side of the screw.

[0008] Preferably, an external thread is provided on the outer side of the plug, a second through hole which can be sleeved on the outer side of the external thread is provided on the upper end of the pressure plate, and a second nut for locking the pressure plate is installed on the external thread and located on the outer side of the pressure plate.

[0009] Preferably, a recessed groove is provided on the side of the gland facing the U-shaped groove, and the sealing gasket is embedded in the recessed groove.

[0010] Preferably, a plurality of vertically extending emptying grooves are provided on the inner wall of the positioning groove.

[0011] Preferably, guide rods are fixedly connected to both sides of the support column, and the pressure plate is provided with guide holes that are slidably matched with the guide rods.

[0012] Preferably, a plurality of mounting holes are provided on the bottom plate.

[0013] The filter element of claim 1, wherein the filter element has a plurality of cams and a plurality of support columns, each of which is adapted to engage a plurality of airbags and a plurality of support columns, each of which has a plurality of cams and a plurality of support columns.

[0014] The use and beneficial effects of the pilot filter element air tightness inspection device are as follows: insert the filter body into the positioning groove, and make the inlet pipe and outlet pipe on both sides of the filter body limited in the U-shaped grooves on both sides, so as to limit the position of the filter body. Then, by shrinking the cylinder shafts at both ends of the bidirectional double-axis cylinder, the glands at both ends are respectively pressed on the outer ends of the inlet pipe and the outlet pipe, so that the air cavity at one end is connected with the inlet pipe, and the air cavity at the other end is connected with the outlet pipe. Then, the air is punched into the plug air cavity connected with it through the inflation pipe, and the inflation enters the inner cavity of the filter body through the inlet pipe, increasing the pressure in the inner cavity of the filter body. After maintaining the pressure for a period of time, the pressure value in the inner cavity of the filter body is obtained through the air pressure sensor. When the pressure value decreases, it means that there is a problem with the sealing of the filter body, otherwise the product is qualified. In addition, a sealing gasket is set on the end face of the gland to improve the contact sealing performance between the gland and the inlet pipe or outlet pipe, and avoid leakage of the contact surface between the inlet pipe or outlet pipe and the gland during the inspection process.

[0015] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0017] Figure 1 It is a structural diagram of a preferred embodiment of the pilot filter element air tightness test device;

[0018] Figure 2 It is a top view of a preferred embodiment of the pilot filter element air tightness test device;

[0019] Figure 3 yes Figure 2 AA cross-sectional structural diagram;

[0020] Figure 4 yes Figure 3 Schematic diagram of the local enlarged structure of area B in the middle.

[0021] Description of Reference Numerals

[0022] 1-base plate; 2-support column; 3-door-shaped groove; 4-bidirectional dual-axis cylinder; 5-mounting hole; 6-screw; 7-first nut; 8-pressure plate; 9-guide rod; 10-inflating tube; 11-plug; 12-external thread; 13-second nut; 14-pressure cover; 15-U-shaped groove; 16-filter body; 17-sealing gasket; 18-outlet pipe; 19-inlet pipe; 20-drain groove; 21-air pressure sensor; 22-positioning groove. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0024] In the present utility model, unless otherwise stated, directional words contained in terms such as "up, down, left, right, front, back, inside, outside" merely represent the orientation of the terms in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the terms.

[0025] See also Figure 1-4 The pilot filter element air tightness inspection device shown in the figure comprises a base plate 1 and a support column 2 fixedly connected to the base plate 1, the top of the support column 2 is provided with a positioning groove 22, and the upper ends of the positioning groove 22 are respectively provided with a U-shaped groove 15, and the bottom of the support column 2 is provided with a gate-shaped groove 3 extending in the same direction as the U-shaped groove 15, and a bidirectional double-axis cylinder 4 is installed in the gate-shaped groove 3 on the base plate 1, and the cylinder shafts at both ends of the bidirectional double-axis cylinder 4 are installed with pressure Plate 8, the upper end of the pressure plate 8 is arranged on the outside of the U-shaped groove 15 adjacent to it, a plug 11 is installed on the upper end of the pressure plate 8, an air cavity is arranged in the middle of the plug 11, the inner end of the air cavity is arranged to be open, and a cover plate is arranged on the outer end, an air pressure sensor 21 is inserted into one of the cover plates, and an inflation tube 10 is arranged on the other cover plate, the inner end of the plug 11 is fixedly connected to a pressure cover 14 whose outer diameter is larger than that of the plug 11, and a sealing gasket 17 is arranged on the end face of the pressure cover 14.

[0026] Through the implementation of the above technical solution, during the inspection, the filter body 16 is inserted into the positioning groove 22, and the inlet pipe 19 and the outlet pipe 18 on both sides of the filter body are respectively limited in the U-shaped grooves 15 on both sides, so as to define the position of the filter body 16. Then, by contracting the cylinder shafts at both ends of the bidirectional double-axis cylinder 4, the pressure caps 14 at both ends are respectively pressed against the outer ends of the inlet pipe 19 and the outlet pipe 18, so that the air cavity at one end is connected with the inlet pipe 19, and the air cavity at the other end is connected with the outlet pipe 18. Then, through the inflation pipe 10, the air is punched into the air cavity of the plug 11 connected thereto, and the inflation enters the inner cavity of the filter body 16 through the inlet pipe 19, increasing the pressure in the inner cavity of the filter body 16. After maintaining the pressure for a period of time, the pressure value in the inner cavity of the filter body 16 is obtained through the air pressure sensor 21. When the pressure value decreases, it means that there is a problem with the sealing of the filter body 16, otherwise the product is qualified. In addition, providing a sealing gasket 17 on the end face of the gland 14 can improve the contact sealing performance between the gland 14 and the inlet pipe 19 or the outlet pipe 18, thereby avoiding air leakage at the contact surface between the inlet pipe 19 or the outlet pipe 18 and the gland 14 during the inspection process.

[0027] In this embodiment, in order to further provide a detachable connection method between the cylinder shaft and the pressure plate 8 to facilitate the later replacement of the pressure plate 8, the outer end of the cylinder shaft is provided with a screw 6 with a diameter smaller than the diameter of the cylinder shaft, and the lower end of the pressure plate 8 is provided with a first through hole that can be sleeved on the screw 6, and a first nut 7 for locking the pressure plate 8 is installed on the screw 6 and located on the outside of the pressure plate 8.

[0028] In this embodiment, in order to further provide a detachable connection method between the plug 11 and the pressure plate 8 to facilitate subsequent replacement and maintenance, an external thread 12 is provided on the outer side of the plug 11, and a second through hole that can be sleeved on the outside of the external thread 12 is provided on the upper end of the pressure plate 8, and a second nut 13 for locking the pressure plate 8 is installed on the external thread 12 and located on the outer side of the pressure plate 8.

[0029] The pressure head in the utility model is cylindrical, and the pressure cover 14 and the pressure head form an integral T-shaped structure, and the pressure plate 8 can be pressed and fixed on the pressure cover 14 in cooperation with the second nut 13. The size of the pressure cover 14 is set so that the pipe openings of the inlet pipe 19 and the outlet pipe 18 can all be pressed on the sealing gasket 17 to achieve sealing.

[0030] In this embodiment, the side of the gland 14 facing the U-shaped groove 15 is provided with a recessed groove, and the sealing gasket 17 is embedded in the recessed groove. Through such an arrangement, the sealing gasket 17 can be completely embedded in the recessed groove, and the center hole of the sealing gasket 17 is connected to the air cavity of the plug 11.

[0031] In this embodiment, a plurality of vertically extending emptying slots 20 are provided on the inner wall of the positioning slot 22. The provision of the emptying slots 20 solves the problem that the air in the positioning slot 22 is difficult to be discharged when the filter body 16 is placed in the positioning slot 22, forming a large resistance.

[0032] In this embodiment, guide rods 9 are fixedly connected to both sides of the support column 2, and the pressure plate 8 is provided with guide holes that slide with the guide rods 9. The setting of the guide rods 9 makes the pressure plate 8 more stable when moving laterally, and one or more guide rods 9 can be set on each side of the support column 2.

[0033] In this embodiment, a plurality of mounting holes 5 are provided on the base plate 1. Through the provision of the plurality of mounting holes 5, the base plate 1 can be fixed on the operating station by passing bolts through the mounting holes 5.

[0034] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0035] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0036] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A pilot filter element air tightness test device, characterized in that: The invention comprises a bottom plate (1) and a support column (2) fixedly connected to the bottom plate (1), wherein a positioning groove (22) is arranged at the top of the support column (2), and a U-shaped groove (15) is arranged on both sides of the upper end of the positioning groove (22), and a door-shaped groove (3) extending in the same direction as the U-shaped groove (15) is arranged at the bottom of the support column (2), and a bidirectional double-axis cylinder (4) is installed in the door-shaped groove (3) on the bottom plate (1), and the cylinder shafts at both ends of the bidirectional double-axis cylinder (4) are both installed with a pressure plate (8), and the upper end of the pressure plate (8) is provided with a pressure plate (8). The end is arranged on the outside of the U-shaped groove (15) adjacent to it, a plug (11) is installed on the upper end of the pressure plate (8), an air cavity is arranged in the middle of the plug (11), the inner end of the air cavity is arranged to be open, and a cover plate is arranged on the outer end, one of the cover plates is inserted with an air pressure sensor (21), and the other cover plate is arranged with an inflation tube (10), the inner end of the plug (11) is fixedly connected with a pressure cover (14) whose outer diameter is larger than the outer diameter of the plug (11), and the end face of the pressure cover (14) is provided with a sealing gasket (17).

2. The pilot filter element air tightness test device according to claim 1, characterized in that: The outer end of the cylinder shaft is provided with a screw rod (6) whose diameter is smaller than that of the cylinder shaft, the lower end of the pressure plate (8) is provided with a first through hole capable of being sleeved on the screw rod (6), and a first nut (7) for locking the pressure plate (8) is installed on the screw rod (6) and located on the outer side of the pressure plate (8).

3. The pilot filter element air tightness test device according to claim 1, characterized in that: The outer side of the plug (11) is provided with an external thread (12), the upper end of the pressure plate (8) is provided with a second through hole that can be sleeved outside the external thread (12), and a second nut (13) for locking the pressure plate (8) is installed on the external thread (12) and located on the outer side of the pressure plate (8).

4. The pilot filter element air tightness test device according to claim 1, characterized in that: A recessed groove is provided on the side of the gland (14) facing the U-shaped groove (15), and the sealing gasket (17) is embedded in the recessed groove.

5. The pilot filter element air tightness test device according to claim 1, characterized in that: A plurality of vertically extending emptying grooves (20) are provided on the inner wall of the positioning groove (22).

6. The pilot filter element air tightness test device according to claim 1, characterized in that: Guide rods (9) are fixedly connected to both sides of the support column (2), and guide holes that are slidably matched with the guide rods (9) are provided on the pressure plate (8).

7. The pilot filter element air tightness test device according to claim 1, characterized in that: The bottom plate (1) is provided with a plurality of mounting holes (5).

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