A valve airtightness test bench

Abstract

The present invention discloses a valve airtightness test bench, which relates to a detection device and includes a bench body. An air source device is fixedly installed inside the bench body, on which a first pressing block and a driving structure are fixedly installed. A second pressing block that can be driven by the driving structure to perform linear reciprocating motion relative to the first pressing block is fixedly installed on the action end of the driving structure. Air holes are respectively formed on the first pressing block and the second pressing block. The air hole on the first pressing block is connected to the air source device through a first conduit. A normally closed first two-way three-way solenoid valve is installed on the first conduit. A first air flow observation device is also communicated through a second conduit on the first conduit between the first two-way three-way solenoid valve and the corresponding air hole. A normally closed second two-way three-way solenoid valve is also installed on the second conduit. The air hole on the second pressing block is connected to a second air flow observation device through a third conduit. A third two-way three-way solenoid valve is installed on the third conduit; the present invention can effectively detect the airtightness of the valve.

Description

Technical Field

[0001] The present invention relates to a detection device, and particularly to a valve airtightness test device. Background Art

[0002] Before a valve leaves the factory, its airtightness parameters need to be tested, and it can only leave the factory after testing that the valve has no leakage. Currently, most of the existing equipment has a complex structure, cumbersome operation, and many testing links. It is not easy for operators to get started, and the work efficiency is low, resulting in extremely difficult large-scale valve testing, especially airtightness testing. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a valve airtightness test bench to solve the technical problem of difficult valve airtightness testing in the prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] A valve airtightness test bench includes a bench frame body. A gas source device is fixedly installed inside the bench frame body, and a first pressing block and a driving structure are fixedly installed thereon. A second pressing block that can be driven by the driving structure to perform linear reciprocating motion relative to the first pressing block is fixedly installed on the action end of the driving structure. Air holes are respectively formed on the first pressing block and the second pressing block, and when the valve body is clamped by the first pressing block and the second pressing block, its inner cavity can be connected to an external pipeline through the two air holes. The air hole on the first pressing block is connected to the gas source device through a first conduit, and a normally closed first two-way three-way solenoid valve is also installed on the first conduit. A first air flow observation device is also communicated through a second conduit on the first conduit between the first two-way three-way solenoid valve and the corresponding air hole, and a normally closed second two-way three-way solenoid valve is also installed on the second conduit. The air hole on the second pressing block is connected to a second air flow observation device through a third conduit, and a third two-way three-way solenoid valve is installed on the third conduit.

[0006] Further, the input end and an output end of a two-way shunt seat are connected in series on the first conduit between the first two-way three-way solenoid valve and the first pressing block, and the input end of the two-way shunt seat faces the first two-way three-way solenoid valve; the connection point between the second conduit and the first conduit is between the two-way shunt seat and the first pressing block, and the other output end of the two-way shunt seat is connected to an intake pressure gauge through a fourth conduit.

[0007] Further, a fifth conduit is communicated on the second conduit between the second two-way three-way solenoid valve and the first conduit, and a normally closed fourth two-way three-way solenoid valve is installed on the fifth conduit.

[0008] Further, the input end and an output end of a three-way flow splitter are connected in series on the third conduit between the third two-way three-way solenoid valve and the second pressing block, and the input end of the three-way flow splitter faces the second pressing block. The second output end of the three-way flow splitter is communicated with a test pressure gauge through a sixth conduit; the third output end of the three-way flow splitter is connected with a seventh conduit, and a normally closed fifth two-way three-way solenoid valve is installed on the seventh conduit.

[0009] Further, a first Y-type filter is also connected in series on the second conduit between the second two-way three-way solenoid valve and the two-way flow splitter, and the connection point between the fifth conduit and the second conduit is between the first Y-type filter and the second two-way three-way solenoid valve. A second Y-type filter is also connected in series on the third conduit between the three-way flow splitter and the second pressing block.

[0010] Further, a normally closed sixth two-way three-way solenoid valve is provided. The sixth two-way three-way solenoid valve is connected in series on an eighth conduit. One end of the eighth conduit is communicated with the third conduit between the three-way flow splitter and the third two-way three-way solenoid valve and the third conduit between the third two-way three-way solenoid valve and the second air flow observation device respectively.

[0011] Further, the end of the fifth conduit facing away from the first two-way three-way solenoid valve and the end of the seventh conduit facing away from the three-way flow splitter are respectively communicated with an input end of a manifold block, and the output end of the manifold block is connected with a filter.

[0012] Further, the air source device, the driving structure, and the six two-way three-way solenoid valves are respectively in signal connection with a controller.

[0013] Further, a concave notch is provided at the front end of the middle part of the bench body, and the bottom of the notch is a horizontal operation surface. The first pressing block is fixedly installed on the top of the operation surface, and a second pressing block is arranged directly above it. The top of the second pressing block is connected with a driving structure installed on the top of the bench body. The intake pressure gauge, the test pressure gauge, the two air flow observation devices, and the controller are respectively installed on the front end face of the top of the bench body.

[0014] Further, a throttle valve installed on the side wall of the bench body is installed on the third conduit between the third two-way three-way solenoid valve and the second air flow observation device. The connection point between the eighth conduit and the third conduit between the third two-way three-way solenoid valve and the second air flow observation device is between the throttle valve and the second air flow observation device. A plurality of annular sealing rings with different inner diameters are evenly embedded on the side walls of the first pressing block and the second pressing block facing each other.

[0015] The present invention has the following advantages compared with the prior art:

[0016] A valve airtightness test bench provided by the present invention can effectively detect the air flow direction inside the valve by setting a plurality of two-way three-way solenoid valves and air flow observation devices, thereby determining the side where the internal leakage point of the valve is located, improving the judgment efficiency, and at the same time, the equipment is easy to operate, avoiding the defect of difficult operation of traditional equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic structural diagram of a valve airtightness test bench provided for an embodiment;

[0018] Figure 2 FIG. is a schematic connection diagram of each air circuit and control circuit in a valve airtightness test bench provided for an embodiment.

[0019] In the figure: 1, bench body; 2, air source device; 3, first pressing block; 4, driving structure; 5, second pressing block; 6, air hole; 7, first conduit; 8, first two-way three-way solenoid valve; 9, second conduit; 10, first air flow observation device; 11, second two-way three-way solenoid valve; 12, third conduit; 13, third two-way three-way solenoid valve; 14, two-way flow splitter; 15, fourth conduit; 16, intake pressure gauge; 17, fifth conduit; 18, fourth two-way three-way solenoid valve; 19, first Y-type filter; 20, second Y-type filter; 21, three-way flow splitter; 22, sixth conduit; 23, test pressure gauge; 24, seventh conduit; 25, fifth two-way three-way solenoid valve; 26, sixth two-way three-way solenoid valve; 27, eighth conduit; 28, manifold; 29, filter; 30, controller; 31, throttle valve; 32, annular sealing ring; 33, second air flow observation device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment

[0022] Combined with the attached Figure 1 and 2 , this embodiment provides a valve airtightness test bench, including a bench body 1. The structure of the bench body 1 can be various, as long as it meets the functional requirements. In this embodiment, combined with the attached Figure 1, in this embodiment, the bench body 1 is specifically in the shape of a cuboid cabinet structure, with a concave notch opened on the front end face of the middle part thereof. The bottom of the notch is a horizontal operation surface, which is convenient for equipment operation therein. Columns are respectively arranged on both sides of the notch in this embodiment to support and connect its upper and lower ends, so as to achieve the purpose of support;

[0023] In order to facilitate the inspection of the air tightness of the valve, in this embodiment, a first pressing block 3 and a second pressing block 5 are first provided. The two pressing blocks are arranged facing each other. The first pressing block 3 is fixedly installed, and the second pressing block 5 is installed on the bench body 1 through a driving structure 4. The driving structure 4 can drive the second pressing block 5 to perform linear reciprocating motion towards the first pressing block 3, so that the valve placed between the two can be effectively clamped or unloaded; Particularly, in order to detect the air tightness of the valve, in this embodiment, air holes 6 are first opened in the first pressing block 3 and the second pressing block 5. One end of each air hole 6 respectively penetrates the side wall of the corresponding pressing block facing the other pressing block, and the other end penetrates the other side wall of the corresponding pressing block, so that the external air flow can enter through one end of the air hole 6, pass through its interior, and enter the valve cavity between the two pressing blocks through the other end, so as to achieve the purpose of injecting gas into the valve cavity;

[0024] At the same time, in order to facilitate the operation of the equipment, in this embodiment, the first pressing block 3 is fixedly installed at the bottom of the notch, and the driving structure 4 is fixedly installed inside the top end of the bench body 1, that is, inside the bench body 1 above the top of the notch; The driving structure 4 is specifically a hydraulic device in this embodiment, so that it can move up and down stably. A second pressing block 5 is installed below it, so as to facilitate clamping the valve body between the two pressing blocks;

[0025] Particularly, in order to achieve the purpose of detecting air tightness, in this embodiment, the end of the air hole 6 in the first pressing block 3 facing away from the other pressing block is connected to the air source device 2 fixedly installed at the bottom of the inner cavity of the bench body 1 through a first conduit 7. The air source device 2 is specifically a device such as an air pump installed in the bench body 1. A normally closed first two-way three-way solenoid valve 8 is installed on the first conduit 7. A first air flow observation device 10 is also communicated through a second conduit 9 on the first conduit 7 between the first two-way three-way solenoid valve 8 and the corresponding air hole 6. At the same time, a second two-way three-way solenoid valve 11 is also installed on the second conduit 9. Secondly, the air hole 6 in the second pressing block 5 is connected to the second air flow observation device 33 through a third conduit 12, and a normally closed third two-way three-way solenoid valve 13 is also communicated on the third conduit 12.

[0026] With the above settings, the first two-way three-way solenoid valve 8 can effectively control the air supply from the air source device 2 to the valve cavity between the two pressing blocks through the first conduit 7. Before the air supply, the valve remains open. When supplying air, the first two-way three-way solenoid valve 8 is opened, and the air flow enters the valve cavity through the first conduit 7. At the same time, the normally closed states of the second and third two-way three-way solenoid valves enable the air flow to stay in the valve cavity, thus achieving the purpose of inflation. After the inflation is completed, the first two-way three-way solenoid valve 8 is closed, and then the valve is operated to make it enter the closed state. Then, the second two-way three-way solenoid valve 11 or the third two-way three-way solenoid valve 13 is opened. The air flow on one side of the valve spool flows into the corresponding air flow observation device through the corresponding conduit. Initially, due to the large air flow rate, violent disturbances will occur. After this period of time, if there are still intermittent or continuous weak air flows, the airtightness of the corresponding side is unqualified, otherwise it is qualified. The same operation is carried out on the other side of the valve for detection; among them, the two air flow observation devices have the same structure, both of which are devices that can observe the air flow pattern and can achieve the purpose of judging whether the air flow is discharged and the discharge state. Specifically, in this embodiment, both of them are specifically composed of a transparent plastic cup or a glass cup, filled with water or petroleum inside. The bottoms of the two are respectively connected to the corresponding conduits. At the same time, the height of a part of the conduit body is higher than the height of the liquid in the corresponding air flow observation device, so as to prevent the liquid from flowing back.

[0027] After the valve is inflated and then closed to make it in the closed state, then the second or third two-way three-way solenoid valve is opened, so that the air flow on one side of the valve surges into the corresponding air flow observation device through the corresponding pipeline and generates a series of bubbles. If there are still small, continuous or intermittent bubbles after the violent generation of bubbles, the airtightness of the corresponding side is unqualified; for example, when inspecting a gate valve, after the inner air hole 6 of the gate valve is filled with gas and has a certain pressure, the first two-way three-way solenoid valve 8 is closed, and then the gate valve is closed. The second or third two-way three-way solenoid valve is opened. For example, when the second two-way three-way solenoid valve 11 is opened, the air flow at its lower part first surges violently into the air flow observation device to generate a series of bubbles. After this series of bubbles occur, if there is a leak at the lower sealing surface of the gate valve, the air flow will flow from its upper part through the leak into the lower part and then surge into the corresponding air flow observation device through the corresponding conduit to generate bubbles. And because this series of bubbles flow in and out through the leak, they will not be as violent as the bubbles that surged in at the beginning, so they are relatively easy to distinguish. The presence of bubbles means that there is a leak at the corresponding side of the gate valve; similarly, when the third two-way three-way solenoid valve 13 is opened, if there are weak continuous bubbles at the corresponding rear end, there is a corresponding leak, otherwise the corresponding sealing surface is qualified; when detecting a globe valve, after inflating the valve first, then the globe valve is closed, and then the first two-way three-way solenoid valve 8 is closed, and then the third two-way three-way solenoid valve 13 is opened to observe whether there will be continuous weak bubbles at the rear end of the second air flow observation device 33. If so, there is a leak and the airtightness is unqualified, otherwise it is qualified.

[0028] Specifically, for the convenience of observing the pressure of the airflow in the charging valve, in this embodiment, the input end and an output end of a two-way shunt seat 14 are connected in series on the first conduit 7 between the first two-position three-way solenoid valve 8 and the first pressure block 3. At the same time, the input end of the two-way shunt seat 14 faces the first two-position three-way solenoid valve 8. The connection point between the second conduit 9 and the first conduit 7 is on the second conduit 9 between the two-way shunt seat 14 and the first pressure block 3. The other output end of the two-way shunt seat 14 is communicated with an intake pressure gauge 16 through a fourth conduit 15 to realize the detection of the charging pressure.

[0029] Specifically, in order to prevent the liquid from overflowing due to the excessive pressure of the valve airflow causing violent disturbance in the corresponding airflow observation device when the second or third two-position three-way solenoid valve is opened, in this embodiment, a fifth conduit 17 is also communicated with the second conduit 9 between the second two-position three-way solenoid valve 11 and the first conduit 7. A fourth two-position three-way solenoid valve 18 is installed on the fifth conduit 17. Thus, the fourth two-position three-way solenoid valve 18 can be opened first before opening the second two-position three-way solenoid valve 11 to effectively relieve the pressure. After opening, it is closed and the second two-position three-way solenoid valve 11 is opened. On the one hand, this can effectively prevent the airflow from violently disturbing the first airflow observation device 10, and at the same time, it can determine whether there is a leakage point.

[0030] Similarly, in this embodiment, the input end and an output end of a three-way shunt seat 21 are connected in series on the third conduit 12 between the third two-position three-way solenoid valve 13 and the second pressure block 5. The input end of the three-way shunt seat 21 faces the second pressure block 5. The other output end of the three-way shunt seat 21 is communicated with a test pressure gauge 23 through a sixth conduit 22, so as to detect the pressure in the valve. The third output end of the three-way shunt seat 21 is connected with a seventh conduit 24. A normally closed fifth two-position three-way solenoid valve 25 is installed on the seventh conduit 24. Thus, the upper part of the valve can be effectively relieved of pressure through the fifth two-position three-way solenoid valve 25, and at the same time, the air pressure in the valve can be observed through the test pressure gauge 23.

[0031] Specifically, in order to prevent impurities from being contained in the airflow, in this embodiment, a first Y-type filter 19 is also connected in series on the second conduit 9 between the second two-position three-way solenoid valve 11 and the two shunt seats. At the same time, the connection point between the fifth conduit 17 and the second conduit 9 is between the first Y-type filter 19 and the second two-position three-way solenoid valve 11. At the same time, a second Y-type filter 20 is also connected in series on the third conduit 12 between the three-way shunt seat 21 and the second pressure block 5. The two Y-type filters can effectively filter the airflow impurities.

[0032] Specifically, in order to facilitate the detection during the airtightness detection of the globe valve, in this embodiment, a normally closed sixth two-way three-way solenoid valve 26 is further provided, which is connected in series on the eighth conduit 27. One end of the eighth conduit 27 is respectively communicated with the third conduit 12 between the three-way shunt seat 21 and the third two-way three-way solenoid valve 13, and the third conduit 12 between the third two-way three-way solenoid valve 13 and the second air flow observation device 33.

[0033] Through the above settings, during the detection of the globe valve, after the globe valve is clamped by the first pressing block 3 and the second pressing block 5, the first two-way three-way solenoid valve 8 and the third two-way three-way solenoid valve 13 are opened, the air flow enters the valve inner cavity, and bubbles are generated in the second air flow observation device 33 through the third two-way three-way solenoid valve 13. Then the globe valve is closed, the fifth two-way three-way solenoid valve 25 is opened for pressure relief and then closed together with the third two-way three-way solenoid valve 13. Then the sixth two-way three-way solenoid valve 26 is opened to observe whether bubbles are generated to judge whether there is leakage.

[0034] Specifically, in order to facilitate the control of the pressure relief air flow, in this embodiment, the end of the fifth conduit 17 away from the first two-way three-way solenoid valve 8 and the end of the seventh conduit 24 away from the three-way shunt seat 21 are respectively communicated with an input end of the flow collector 28, and the output end of the flow collector 28 is communicated with the filter 29. Thus, the air flows discharged from the two conduits can enter the filter 29 through the flow collector, so as to achieve the purpose of controlling the pressure relief air flow.

[0035] Specifically, in order to facilitate the control of the equipment, the air source device 2, the driving structure 4, and the six two-way three-way solenoid valves are respectively signal-connected to the controller 30, so as to facilitate the control of the equipment; at the same time, the controller 30 is installed on the front end face at the top of the bench body 1, and the air source device 2, the driving structure 4, and the six two-way three-way solenoid valves are installed in the inner cavity of the bench body 1, and the two air flow observation devices and the two pressure gauges are both installed on the front end face at the top of the bench body 1, so as to facilitate the observation of the equipment.

[0036] Specifically, a throttle valve 31 installed on the side wall of the bench body 1 is installed on the third conduit 12 between the third two-way three-way solenoid valve 13 and the second air flow observation device 33. The connection point between the eighth conduit 27 and the third conduit 12 between the third two-way three-way solenoid valve 13 and the second air flow observation device 33 is between the throttle valve 31 and the second air flow observation device 33. Annular sealing rings 32 are evenly embedded on the side walls of the first pressing block 3 and the second pressing block 5 facing each other, that is, a plurality of annular sealing rings 32 with different inner diameters are embedded on the side wall of each pressing block facing the other pressing block.

[0037] By setting the throttle valve 31, the discharge amount of the air flow can be effectively controlled, thereby avoiding violent disturbance of the liquid in the second air flow observation device 33. The annular sealing ring 32 can effectively seal valves of different sizes, thus improving the applicable range of the equipment.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A valve airtightness test bench, including a bench body, characterized in that, An air source device is fixedly installed in the platform body, a first pressure block and a driving structure are fixedly installed on it, a second pressure block which can be driven by it to perform linear reciprocating motion relative to the first pressure block is fixedly installed on the action end of the driving structure, air holes are respectively opened on the first pressure block and the second pressure block, and when the valve body is clamped by the first pressure block and the second pressure block, its inner cavity can be connected to the external pipeline through the two air holes, the air holes on the first pressure block are connected to the air source device through the first conduit, a normally closed first two-position three-way solenoid valve is also installed on the first conduit, a first airflow observation device is also connected to the first conduit between the first two-position three-way solenoid valve and the corresponding air holes through the second conduit, a normally closed second two-position three-way solenoid valve is also installed on the second conduit, the air holes on the second pressure block are connected to the second airflow observation device through the third conduit, and a third two-position three-way solenoid valve is installed on the third conduit; The third conduit between the third two-position three-way solenoid valve and the second pressure block is connected in series with an input end and an output end of a three-way diverter seat, and the input end of the three-way diverter seat faces the second pressure block, and the second output end of the three-way diverter seat is connected to the test pressure gauge through the sixth conduit; the third output end of the three-way diverter seat is connected to the seventh conduit, and the normally closed fifth two-position three-way solenoid valve is installed on the seventh conduit; A normally closed sixth two-position three-way solenoid valve is also provided. The sixth two-position three-way solenoid valve is connected in series to the eighth conduit. One end of the eighth conduit is respectively connected to the third conduit between the three-way diverter seat and the third two-position three-way solenoid valve, and to the third conduit between the third two-position three-way solenoid valve and the second airflow observation device.

2. The airtightness test bench for a valve according to claim 1, characterized in that, An input end and an output end of a two-way diverter seat are connected in series on the first conduit between the first two-position three-way solenoid valve and the first pressure block, and the input end of the two-way diverter seat faces the first two-position three-way solenoid valve; the connection point between the second conduit and the first conduit is between the two-way diverter seat and the first pressure block, and the other output end of the two-way diverter seat is connected to the intake pressure gauge through a fourth conduit.

3. The airtightness test bench for a valve according to claim 2, characterized in that, The second conduit between the second two-position three-way solenoid valve and the first conduit is connected with a fifth conduit, and a normally closed fourth two-position three-way solenoid valve is installed on the fifth conduit.

4. The valve airtightness test bench according to claim 2, characterized in that, A first Y-type filter is also connected in series on the second conduit between the second two-position three-way solenoid valve and the two-way diverter seat, and the connection point between the fifth conduit and the second conduit is between the first Y-type filter and the second two-position three-way solenoid valve, and a second Y-type filter is also connected in series on the third conduit between the three-way diverter seat and the second pressure block.

5. The airtightness test bench for a valve according to claim 4, characterized in that, The end of the fifth conduit away from the first two-position three-way solenoid valve and the end of the seventh conduit away from the three-way flow diverter seat are respectively connected to an input end of the current collector seat, and the output end of the current collector seat is connected to the filter.

6. The airtightness test bench for a valve according to claim 5, characterized in that The air source device, the driving structure, and the six two-position three-way solenoid valves are respectively connected to the controller signal.

7. The airtightness test bench for a valve according to claim 6, characterized in that, A concave notch is provided at the front end of the middle part of the bench body, and the bottom of the notch is a horizontal operation surface. The first pressing block is fixedly installed on the top of the operation surface, and a second pressing block is arranged directly above it. The top of the second pressing block is connected to a driving structure installed on the top of the bench body. The intake pressure gauge, the test pressure gauge, two air flow observation devices, and the controller are respectively installed on the front end surface of the top of the bench body.

8. The airtightness test bench for a valve according to claim 7, characterized in that, A throttle valve installed on the side wall of the bench body is installed on the third conduit between the third two-position three-way solenoid valve and the second air flow observation device. The connection point between the eighth conduit and the third conduit between the third two-position three-way solenoid valve and the second air flow observation device is between the throttle valve and the second air flow observation device. A plurality of annular sealing rings with different inner diameters are evenly embedded on the side walls of the first pressing block and the second pressing block facing each other.

Images