Sealing plug

Abstract

The application aims to provide a sealing plug, which comprises a base, a quick-change assembly and a sealing assembly. The base is provided with a T-shaped groove along a radial direction. The quick-change assembly comprises a screw cap and an inner shell. The bottom of the inner shell is provided with a T-shaped block, which is arranged in the T-shaped groove. The screw cap is screwed with the inner shell. The sealing assembly comprises a piston, a sealing ring and an elastic member. The inner shell is provided with a back pressure cavity. The piston is arranged in the back pressure cavity. The piston is provided with a gas injection hole. The elastic member is respectively abutted with the piston and the bottom wall of the back pressure cavity. The sealing ring is sleeved on the piston and abutted with the inner side wall of the back pressure cavity. The angle of the sealing plug and the assembly direction position of the T-shaped groove can be adjusted appropriately. The piston with the sealing ring has a certain free swing in the axial direction, which can effectively adapt to the test of different sizes of valve bodies. The sealing plug is adaptively sealed with the valve body by using the reverse thrust of the test gas, and the fault tolerance of the installation position is improved. The application can be applied to the sealing field.

Description

TECHNICAL FIELD

[0001] The present application relates to the sealing field, in particular to a sealing plug. BACKGROUND

[0002] Valve body refers to a device for controlling the flow of medium (liquid, gas and other flowable substances), flow direction, flow pressure, flow size, which will be involved in both industrial equipment and household appliances, such as flow valve in industrial manufacturing, or control valve used in household natural gas, which can be collectively referred to as valve body.

[0003] As a flow medium regulating device, the primary characteristic of the valve body is sufficient sealing, so that no matter what type of valve body, in the production process, needs to be strictly tested for sealing, for example, a reserved opening is provided, and the remaining openings of the valve body are blocked, and the valve body is injected into the reserved opening, so that the air leakage of the valve body can be detected, and the sealing performance of the valve body can be measured.

[0004] However, due to the different types and sizes of valve bodies on the market, each company needs to use corresponding plugs for valve bodies with specific structural shapes when testing the valve body, resulting in a lack of compatibility of the existing plug structure, and secondly, the existing plug mostly adopts a threaded screwing fixing method, which requires a lot of time to rotate the plug during valve sealing test, not only reducing the sealing test efficiency, but also the threaded screwing method has poor sealing performance. Therefore, in order to solve the above technical problems, the sealing plug of the present application is proposed. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a sealing plug which can be used for sealing test of various valve bodies, has good sealing performance, simple structure and convenient operation.

[0006] The technical solution adopted by the present application is:

[0007] A sealing plug, comprising:

[0008] A base is provided with a T-shaped groove along the radial direction;

[0009] A quick-change assembly includes a screw cap and an inner shell, the bottom of the inner shell is provided with a T-shaped block, the T-shaped block is fitted into the T-shaped groove, and the screw cap is screwed with the inner shell to fix the inner shell on the base;

[0010] The plugging assembly comprises a piston, a sealing ring and an elastic member, a back pressure cavity is formed on the end of the inner shell away from the base, the piston is at least partially arranged in the back pressure cavity, a gas injection hole is formed on the piston and communicates with the back pressure cavity, a clamping protrusion is arranged on the outer side wall of the piston in the back pressure cavity, a limiting protrusion is arranged on the end of the rotary cap away from the base, the elastic member is arranged in the back pressure cavity and abuts against the bottom wall of the back pressure cavity and the piston respectively, the elastic member is used for pushing the piston so that the clamping protrusion abuts against the limiting protrusion, and the sealing ring is sleeved on the piston and abuts against the inner side wall of the back pressure cavity.

[0011] Preferably, the T-shaped block and the inner shell are integrally formed.

[0012] Preferably, the base, the rotary cap, the inner shell and the piston are all cylindrical structures.

[0013] Preferably, a tightening screw hole is formed on the bottom wall of the T-shaped groove, a tightening screw is arranged in the tightening screw hole and abuts against the bottom surface of the T-shaped block.

[0014] Preferably, the elastic member is a spring.

[0015] Preferably, an installation groove is formed on the outer side wall of the clamping protrusion, and the sealing ring is sleeved in the installation groove.

[0016] Preferably, an anti-abutting surface is arranged on the end of the piston in the back pressure cavity, and the anti-abutting surface is perpendicular to the axis of the piston.

[0017] Preferably, a soft pad is arranged on the end of the piston away from the inner shell, and an air hole is formed on the soft pad and communicates with the gas injection hole.

[0018] Preferably, a groove is formed on the end of the piston away from the inner shell, and the soft pad is arranged in the groove.

[0019] Preferably, a friction concave line is formed on the outer side wall of the rotary cap.

[0020] The present application has the following advantages:

[0021] 1. The plugging assembly and the quick change assembly can be quickly disassembled and replaced through the cooperation of the rotary cap and the inner shell, so that the sealing detection of valve bodies of different sizes can be compatible.

[0022] 2. The structure is simple. It uses the reverse thrust generated by the test gas to improve the tightness between the piston and the valve body, so that the sealing plug can adaptively seal the valve body opening. Compared with the traditional screw-on sealing structure, it is more convenient to operate.

[0023] 3. The piston is tilted at a certain angle relative to the inner shell, which can also reliably seal the valve body, thereby improving the fault tolerance of the sealing plug installation position. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a sealing plug according to one embodiment of the present invention;

[0025] Figure 2 for Figure 1 The diagram shows a partial structural schematic of the sealing plug;

[0026] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the sealing plug shown;

[0027] Figure 4 for Figure 1 The diagram shows the structure of another part of the sealing plug;

[0028] Figure 5 for Figure 1 The diagram shows the implementation structure of the sealing plug. Detailed Implementation

[0029] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention.

[0030] like Figures 1 to 3 As shown, a sealing plug 1 includes a base 11, a quick-change assembly 12, and a sealing assembly 13. The base 11 has a T-slot 111 along the radial direction. The quick-change assembly 12 includes a screw cap 121 and an inner shell 122. A T-block 123 is provided at the bottom of the inner shell 122. The T-block 123 is adapted to pass through the T-slot 111. The screw cap 121 is screwed to the inner shell 122 so that the inner shell 122 is fixedly installed on the base 11.

[0031] Specifically, the sealing assembly 13 is mounted on the base 11 via the quick-change assembly 12. The base 11 has a T-slot 111, and the bottom of the inner shell 122 has a T-block 123. Both the T-slot 111 and the T-block 123 extend radially along the base 11. The inner wall of the cap 121 has internal threads, and the outer wall of the inner shell 122 has external threads, allowing the cap 121 to be screwed onto the inner shell 122. Thus, as the cap 121 is tightened, it presses against the base 11, thereby causing the T-block 123 on the inner shell 122 to engage with the inner wall of the T-slot 111, thus fixing the inner shell 122 and the base 11 together. The sealing assembly 13 is mounted on the inner shell 122. Thus, through the screw-on structure of the cap 121 and the inner shell 122, and the engaging action of the T-block 123 and the T-slot 111, the sealing assembly 13 can be quickly installed and removed. Specifically, during removal, simply loosen the cap 121, and the inner shell 122, along with the sealing assembly 13, can be slid radially along the base 11, allowing the T-block 123 to slide out of the T-slot 111, thus enabling removal. Therefore, the sealing assembly 13 can be replaced according to the different sizes of the valve body opening.

[0032] Furthermore, such as Figures 1 to 3 As shown, the sealing assembly 13 includes a piston 131, a sealing ring 132, and an elastic element 133. A back pressure chamber 1221 is formed on the end face of the inner shell 122 away from the base 11. At least a portion of the piston 131 is inserted into the back pressure chamber 1221. An air injection port 1311 communicating with the back pressure chamber 1221 is formed on the piston 131. A locking protrusion 134 is provided on the outer wall of the piston 131 within the back pressure chamber 1221. The cap 12... A limiting protrusion 124 is provided on one end away from the base 11. An elastic element 133 is located in the back pressure cavity 1221, and the elastic element 133 abuts against the piston 131 and the bottom wall of the back pressure cavity 1221 respectively. The elastic element 133 is used to push the piston 131 so that the locking protrusion 134 abuts against the limiting protrusion 124. The sealing ring 132 is sleeved on the piston 131, and the sealing ring 132 abuts against the inner side wall of the back pressure cavity 1221.

[0033] Specifically, a back pressure cavity 1221 is formed on the top surface of the inner shell 122, and then the piston 131 is installed in the back pressure cavity 1221. Part of the piston 131 is located in the back pressure cavity 1221, and the remaining part extends out of the back pressure cavity 1221. In order to prevent the piston 131 from sliding directly out of the back pressure cavity 1221, a locking protrusion 134 is provided on the outer wall of the piston 131 located in the back pressure cavity 1221, and a limiting protrusion 124 is provided on the screw cap 121. The inner diameter of the limiting protrusion 124 is smaller than the outer diameter of the locking protrusion 134. In this way, when the piston 131 slides out of the back pressure cavity 1221, the limiting protrusion 124 is ensured to abut against the locking protrusion 134, so that the piston 131 has a limit position when sliding in the back pressure cavity 1221. The elastic element 133 is installed in the back pressure chamber 1221, and the elastic element 133 abuts against the piston 131 and the bottom wall of the back pressure chamber 1221 respectively. For example, the elastic element 133 is a spring. In this way, the elastic thrust of the elastic element 133 makes the piston 131 have a tendency to slide away from the base 11, and finally the locking protrusion 134 abuts against the limiting protrusion 124.

[0034] The working principle of the sealing plug 1 described above will be explained below. When the valve body is subjected to a sealing test, one opening needs to be reserved for inflation, while the remaining openings need to be blocked. The sealing plug 1 of this application is used to block the remaining openings. Specifically, the opening of the valve body to be blocked is placed against the top surface of the piston 131, so that the air injection port 1311 and the back pressure chamber 1221 are connected to the cavity of the valve body. Thus, when the valve body abuts against the piston 131, the elastic element 133 is compressed. As the valve body is inflated for a sealing test, the inflated gas enters the back pressure chamber 1221 through the air injection hole 1311. The pressure of the gas then acts on the side of the piston 131 closest to the inner shell 122. Under the pressure generated by the test gas, the piston 131 can be tightly abutted against the opening of the valve body, thereby enabling the sealing plug 1 of this application to reliably seal the valve body. Therefore, compared with the traditional plug using threaded connections, the sealing plug 1 of this application uses the pressure of the test gas to reliably seal the valve body. It has a simple structure, is easy to operate, and improves test efficiency by shortening the preparation time for the sealing test.

[0035] The quick-change component 12 of the plugging component 13 enables rapid replacement, so the plugging component 13 of different sizes can be replaced according to the different opening sizes of the valve body, thereby effectively improving versatility.

[0036] Furthermore, since there is a gap between the piston 131 and the inner wall of the back pressure chamber 1221, the gap is then eliminated by the sealing ring 132 to ensure that the piston 131 and the back pressure chamber 1221 are in a sealed state. Thus, under the action of the sealing ring 132 and the elastic force of the elastic element 133, even if the axis of the piston 131 deviates from the axis of the inner shell 122 during the sealing process of the valve body, the sealing between the piston 131 and the inner wall of the back pressure chamber 1221 can still be ensured. This means that when the sealing plug 1 actually closes the valve body opening, even if the valve body opening presses against the piston 131 and causes the piston 131 to swing axially for a certain amplitude, the top surface of the piston 131 can still adaptively fit and abut against the port of the valve body or other workpieces. Therefore, even if there is a certain positional error between the sealing plug 1 and the valve body or other workpieces, the piston 131's characteristic of a certain swing amplitude can eliminate this positional error, reliably and stably sealing the opening of the valve body or other workpieces. This provides greater tolerance for installation position errors during actual installation and use.

[0037] Preferably, the T-block 123 and the inner shell 122 are integrally formed. Specifically, the T-block 123 is disposed on the bottom surface of the inner shell 122. Integrating the T-block 123 and the inner shell 122 into an integral structure ensures the structural strength between them. Further, preferably, the piston 131 and the locking protrusion 134 are also integrally formed, and the screw cap 121 and the limiting protrusion 124 are also integrally formed, thus ensuring sufficient structural strength.

[0038] Furthermore, preferably, the base 11, the screw cap 121, the inner shell 122, and the piston 131 are all cylindrical structures. This facilitates the installation of the components.

[0039] like Figure 1 and Figure 2 As shown, preferably, a tightening screw hole 112 is provided on the bottom wall of the T-slot 111, and a tightening screw is inserted into the tightening screw hole 112, with the tightening screw abutting against the bottom surface of the T-block 123.

[0040] Specifically, in order to improve the structural strength between the inner shell 122 and the base 11, a tightening screw is screwed into the base 11. By tightening the tightening screw, the tightening screw holds the inner shell 122, so that the T-shaped block 123 on the inner shell 122 presses against the upper inner wall of the T-shaped groove 111 to achieve compression and fixation.

[0041] like Figure 3 As shown, preferably, an installation groove 1341 is provided on the outer side wall of the locking protrusion 134, and the sealing ring 132 is fitted inside the installation groove 1341.

[0042] Specifically, in order to ensure that the sealing ring 132 is stably fitted onto the outer wall of the piston 131, thereby reliably sealing the gap between the piston 131 and the inner wall of the back pressure chamber 1221, a mounting groove 1341 is provided on the locking protrusion 134 so that the sealing ring 132 fits into the mounting groove 1341.

[0043] like Figure 3 As shown, preferably, the piston 131 has a reverse top surface 1312 on one end located in the back pressure chamber 1221, and the reverse top surface 1312 is perpendicular to the axis of the piston 131.

[0044] Specifically, during the sealing test, gas is injected into the valve body and enters the back pressure chamber 1221 through the injection port 1311. The gas then pushes against the top surface 1312, causing the piston 131 to generate a reaction force. In this way, the thrust of the test gas is used to improve the contact strength between the valve body opening and the piston 131, thereby improving the tightness between the piston 131 and the valve body opening.

[0045] It should be noted that the area of ​​the reverse top surface 1312 is larger than the side of the piston 131 that is away from the inner shell 122. This makes the force of the test air pressure acting on the reverse top surface 1312 greater than the force of the test air pressure acting on the top surface of the piston 131, thereby increasing the contact force between the piston 131 and the valve body. Therefore, the greater the test air pressure, the greater the air pressure thrust on the reverse top surface 1312, which enables the piston 131 to better seal the valve body and other workpieces.

[0046] like Figures 1 to 3 As shown, preferably, a soft pad 135 is provided on the end of the piston 131 away from the inner shell 122, and a vent hole 1351 communicating with the air injection hole 1311 is provided on the soft pad 135.

[0047] Specifically, in order to further improve the tightness between the piston 131 and the valve body opening, a soft pad 135 is installed on the top surface of the piston 131. For example, the soft pad 135 is made of silicone, and the soft pad 135 and the piston 131 are bonded together.

[0048] Furthermore, preferably, a groove is formed on the end of the piston 131 away from the inner shell 122, and the soft pad 135 is accommodated in the groove. In this way, the structural stability between the soft pad 135 and the piston 131 can be improved.

[0049] Furthermore, such as Figure 1 and Figure 2 As shown, preferably, friction grooves 1211 are provided on the outer side wall of the screw cap 121. In this way, when screwing the screw cap 121, the friction between the fingers and the screw cap 121 can be increased, making it easier to tighten or loosen the screw cap 121.

[0050] like Figure 1 , Figure 3 and Figure 4 As shown, preferably, the sealing plug 1 further includes a mounting base 151, a pin 152, and a push rod 153. The pin 152 is sequentially inserted through the base 11 and the mounting base 151 so that the base 11 can rotate relative to the mounting base 151. The push rod 153 is screwed to the mounting base 151 and abuts against the base 11. The push rod 153 is used to push the base 11 so that the angular position of the base 11 relative to the mounting base 151 is maintained.

[0051] Specifically, the base 11 is rotatably mounted on the mounting base 151, so that the sealing plug 1 can be installed according to the actual structure of the valve body. Moreover, it can maintain a seal even when the piston 131 is tilted relative to the inner shell 122, further improving the ease of use of the sealing plug 1. The base 11 and the mounting base 151 are connected by a pin 152, allowing the base 11 to rotate relative to the mounting base 151. The push rod 153 is screwed to the mounting base 151, and the end of the push rod 153 abuts against the base 11. Thus, once the rotational position of the base 11 relative to the mounting base 151 is determined, the push rod 153 pushes the base 11 to maintain its position.

[0052] Furthermore, such as Figure 1 and Figure 4 As shown, the mounting base 151 has mounting holes 1511, which are used for mounting and fixing by screws. For example, the mounting hole 1511 is an oblong hole. Furthermore, multiple mounting holes 1511 can be provided, so that the mounting base 151 can be easily installed in a specific fixture for use.

[0053] It should be noted that when using the sealing plug 1 of this application, it is necessary to ensure that the valve body applies a certain pressure to the sealing plug 1, for example, the valve body is pressed down by a cylinder so that the valve body generates a thrust on the piston 131.

[0054] like Figure 5 As shown, this is one embodiment of the sealing plug 1 of this application. The port of the test valve body 2 abuts against the soft pad 135. Gas is introduced into the test valve body 2 by an air compressor, causing the airflow to flow into the back pressure chamber 1221 through the port of the test valve body 2. In the back pressure chamber 1221, the gas pushes against the anti-top surface 1312, making the soft pad 135 tightly contact the port of the test valve body 2. This achieves reliable sealing of the port of the test valve body 2.

[0055] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A sealing plug, characterized in that, include: The base has a T-shaped groove formed along the radial direction; A quick-change assembly includes a screw cap and an inner shell. A T-shaped block is provided at the bottom of the inner shell. The T-shaped block is adapted to pass through the T-shaped groove. The screw cap is screwed to the inner shell so that the inner shell is fixedly installed on the base. A tightening screw hole is provided on the bottom wall of the T-shaped groove. A tightening screw passes through the tightening screw hole and abuts against the bottom surface of the T-shaped block. A sealing assembly includes a piston, a sealing ring, and an elastic element. A back pressure cavity is formed on the end face of the inner shell away from the base. At least a portion of the piston's structure passes through the back pressure cavity. An air injection hole communicating with the back pressure cavity is formed on the piston. A locking protrusion is provided on the outer wall of the piston within the back pressure cavity. A limiting protrusion is provided on the end of the cap away from the base. The elastic element is located within the back pressure cavity and abuts against both the piston and the bottom wall of the back pressure cavity. The elastic element is used to push the piston so that the locking protrusion abuts against the limiting protrusion. The sealing ring is fitted onto the piston and abuts against the inner wall of the back pressure cavity.

2. The sealing plug according to claim 1, characterized in that, The T-shaped block and the inner shell are integrally formed.

3. The sealing plug according to claim 1, characterized in that, The base, the screw cap, the inner shell, and the piston are all cylindrical structures.

4. The sealing plug according to claim 1, characterized in that, The elastic element is a spring.

5. The sealing plug according to claim 1, characterized in that, An installation groove is provided on the outer side wall of the card slot protrusion, and the sealing ring is fitted inside the installation groove.

6. The sealing plug according to claim 1, characterized in that, The piston has an inverted top surface at one end located inside the back pressure chamber, and the inverted top surface is perpendicular to the axis of the piston.

7. The sealing plug according to claim 1, characterized in that, A soft pad is provided on the end of the piston away from the inner shell, and a vent hole is provided on the soft pad that communicates with the air injection hole.

8. The sealing plug according to claim 7, characterized in that, A groove is provided on the end of the piston away from the inner shell, and the soft pad is accommodated in the groove.

9. The sealing plug according to claim 1, characterized in that, The outer wall of the screw cap has friction grooves.

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