Standard reference tank capable of finely adjusting equivalent volume

Abstract

The utility model relates to a fine-adjustable equivalent volume standard reference tank. A tank sealing area, a gas inlet pipeline and a detection gas circuit are arranged on a supporting base, wherein the gas inlet pipeline and the detection gas circuit are communicated with the tank sealing area; the tank body is installed on the supporting base corresponding to the tank sealing area, and the tank body and the supporting base define a containing cavity; the piston is embedded in the containing cavity and divides the containing cavity into a detection cavity and a standby cavity, the detection cavity is communicated with an air inlet pipeline and a detection air path on the supporting base, and the volume of the detection cavity is adjusted according to movement of the piston in the containing cavity; the marking piece is connected with the piston, and scales are arranged on the marking piece and can reflect the volume of the detection cavity. The volume-adjustable detection cavity is constructed by utilizing a mode that the piston moves in the accommodating cavity, adjustment can be carried out according to the volume of a detected object, one tank has multiple purposes, a matched independent standard reference tank with a fixed volume is reduced, the use cost is reduced, the disassembly and replacement processes during detection work are also reduced, and the detection efficiency is greatly improved; and meanwhile, a too large setting place is not occupied, and storage is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing detection equipment, in particular to a pressure differential sealing detection instrument. Background Art

[0002] Figure 1 As shown, the differential pressure sealing tester mainly includes an air source 101, a pressure regulating valve 102, a switching valve 103, a product to be tested 104, a standard reference tank 105 and a differential pressure sensor 106. The same air pressure is respectively filled into the product to be tested and the standard reference tank through the air source, the pressure regulating valve and the switching valve. The volumes of the product to be tested and the standard reference tank are consistent, and the differential pressure test is performed under the same temperature environment. The differential pressure sensor provides feedback on the sealing condition of the product to be tested.

[0003] However, the standard reference tank used in existing differential pressure leak detection instruments is an independent tank with a fixed volume. One detection instrument needs to be equipped with multiple standard reference tanks of different volumes, resulting in the following defects:

[0004] 1. During the differential pressure leak detection process of the tested product (seal), each time a different tested product is switched, the "standard reference tank" of the qualified workpiece needs to be switched and the test gas source of the qualified workpiece needs to be reconnected, which increases the disassembly and replacement work and is inefficient. In addition, the previous "standard reference tank" that has been replaced needs to be stored and kept, which increases the storage burden.

[0005] 2. Most of the existing standard reference tanks are imported standard tanks with non-adjustable volumes, are expensive, and have high investment costs. Summary of the Invention

[0006] The purpose of the utility model is to provide a standard reference tank with fine-tunable equivalent volume, which has multiple uses, a simple and compact structure, and is easy to implement, thus effectively solving the above-mentioned technical problems.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] Fine-tunable equivalent volume standard reference tank with:

[0009] A support base is provided with a can sealing area and an air inlet pipe and a detection air path connected to the can sealing area;

[0010] The tank body is mounted on the support base corresponding to the sealing area, and the tank body and the support base enclose a cavity;

[0011] A piston is embedded in the cavity and divides the cavity into a detection cavity and a standby cavity. The detection cavity is connected to the air inlet pipe and the detection air path on the support base, and the volume of the detection cavity is adjusted according to the movement of the piston in the cavity.

[0012] The identification piece is connected to the piston and is provided with a scale so that when the piston moves in the cavity, the scale can reflect the volume of the detection cavity.

[0013] The above scheme is further that the tank body includes a tubular tank body and a top cover, the top cover seals the upper end of the tubular tank body, and the lower end of the tubular tank body covers the sealing area; the sealing area has a raised rim, the rim is inserted into the tubular tank body and is tightly connected to the inner wall of the tubular tank body; the identification part is a screw rod passing through the top cover, the scale is evenly arranged along the axial direction of the screw rod, and the lower end of the screw rod is connected to the piston through a bearing, so that the screw rod can rotate relative to the piston and the axial movement of the screw rod is used to push and pull the piston.

[0014] The above scheme is further that the support base is a long plate body, the can sealing area is located in the central area of the support base, and a control valve and a digital pressure gauge are also installed on the support base. The control valve and the digital pressure gauge are respectively arranged on the left and right sides of the can sealing area. One end of the air intake pipe leads to the center of the can sealing area, and the other end of the air intake pipe is connected to the control valve, and the air intake pipe also leads out a bypass branch to connect the digital pressure gauge.

[0015] The above scheme is further that the lower end of the tubular tank body covers the sealing area and is locked on the support base by bolts, the bolts pass through the support base from the bottom side upward and are threadedly connected to the tubular tank body, and a first sealing ring is embedded between the lower end of the tubular tank body and the support base, the first sealing ring is arranged at the outer root of the ring edge, and the tubular tank body and the support base together positively clamp the first sealing ring.

[0016] The above scheme is further that the piston is disc-shaped, the outer diameter of the piston is consistent with the inner diameter of the cavity, and a second sealing ring and a third sealing ring are provided on the outer periphery of the piston. There are two third sealing rings and they are respectively arranged on the upper and lower sides of the second sealing ring, so that the piston forms a three-level seal with the inner wall of the cavity in the moving direction.

[0017] In the above solution, the second sealing ring is an O-ring, and the third sealing ring is a multi-layer Y-ring.

[0018] The above solution is further provided with a handwheel at the upper end of the screw rod passing through the top cover.

[0019] The standard reference tank provided by the present invention utilizes the movement of a piston in a cavity to construct a detection cavity with adjustable volume. Therefore, it can be adjusted according to the volume of the object to be measured. One tank can be used for multiple purposes, reducing the number of standard reference tanks with independent fixed volumes, reducing the cost of use, and also reducing the disassembly and replacement procedures during detection work, thereby greatly improving detection efficiency. At the same time, the present invention has a simple and compact structure, is easy to implement, does not require a large setting space, and is easy to store.

[0020] The utility model has a reasonable and effective structural design, is stable and reliable, has good sealing, will not leak, and can be used safely for a long time; it is also easy to adjust so that one standard device can correspond to different workpieces, thereby promoting pressure differential sealing detection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attachment Figure 1 It is a structural diagram of an existing differential pressure sealing test instrument;

[0022] Attachment Figure 2 This is a schematic structural diagram of one embodiment of the present utility model;

[0023] Attachment Figure 3 for Figure 2 A schematic diagram of the structural decomposition of an embodiment;

[0024] Attachment Figure 4 、 5 It is a cross-sectional view of the internal structure of the utility model. DETAILED DESCRIPTION

[0025] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

[0026] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] See Figure 2 、 3, 4, and 5 are schematic structural diagrams of preferred embodiments of the present invention. The present invention relates to a standard reference tank with fine-tunable equivalent volume, which comprises a support base 1, a tank body 2, a piston 4, and an identification member 5. The support base 1 is provided with a sealing area 11 and an air intake pipe 12 and a detection air circuit 13 connected to the sealing area 11; the air intake pipe 12 and the detection air circuit 13 are obtained by drilling holes on the support base 1, and the structure is reliable and stable, and the assembly is simplified. The tank body 2 is mounted on the support base 1 corresponding to the sealing area 11, and the tank body 2 and the support base 1 are enclosed to form a cavity 3. The piston 4 is embedded in the cavity 3 and divides the cavity 3 into a detection cavity 31 and a spare cavity 32. The detection cavity 31 is connected to the air intake pipe 12 and the detection air circuit 13 on the support base 1, so that the air intake pipe 12 is filled with the corresponding air pressure, and the detection air circuit 13 leads the air pressure of the detection cavity 31 to the pressure differential sensor for pressure differential sealing detection. The volume of detection chamber 31 is adjusted based on the movement of piston 4 within chamber 3, offering adjustability, allowing a single standard to accommodate different workpieces. An identification member 5 is connected to piston 4 and is provided with a scale 51. As piston 4 moves within chamber 3, scale 51 reflects the volume of detection chamber 31, facilitating adjustment operations with a simple, intuitive, and quick design.

[0028] Figure 2 、 3As shown in Figures 4 and 5, in this embodiment, the tank body 2 comprises a tubular body 21 and a top cover 22. The top cover 22 seals the upper end of the tubular body 21, while the lower end of the tubular body 21 covers the sealing area 11. This simple structure facilitates manufacture, assembly, and maintenance. The sealing area 11 has a raised rim 111 that is inserted into the tubular body 21 and tightly connected to the inner wall of the tubular body, enhancing the assembly structure and sealing performance. Furthermore, the lower end of the tubular tank body 21 covers the sealing area 11 and is locked to the support base 1 by means of bolts 8. The bolts 8 pass through the support base from the lower side of the support base 1 and are then threadedly connected to the tubular tank body 21. A first sealing ring 91 is embedded between the lower end of the tubular tank body 21 and the support base 1. The first sealing ring 91 is arranged at the outer root of the ring edge 111. The tubular tank body 21 and the support base 1 together clamp the first sealing ring 91 in a positive direction. The structure is simple, easy to assemble, and the sealing is synchronized. In this embodiment, the portion where the tubular tank body 21 is threadedly connected to the bolts 8 is designed as a lug to increase the structural and assembly stability of the tubular tank body 21. This embodiment takes four bolts 8 as an example for locking, but is not limited to this form. The number of bolts 8 can be set as needed. The identification member 5 is a screw rod extending from the top cover 22, and the scale 51 is evenly arranged along the axial direction of the screw rod. A corresponding reference point for reading with the scale 51 is provided on the top cover 22. The reference point of this embodiment is a tapered sleeve, and the data is read by aligning the top surface of the tapered sleeve with the scale 51. The structure is simple and intuitive. The lower end of the screw rod is connected to the piston 4 through a bearing, so that the screw rod can rotate relative to the piston 4 and use the axial movement of the screw rod to push and pull the piston 4. The integrated design not only obtains the identification function, but also has a driving effect, which is beneficial to the volume adjustment of the detection chamber 31. Furthermore, a handwheel 52 is provided at the upper end of the screw rod extending from the top cover 22, and the screw rod can be rotated by holding the handwheel 52 to adjust the volume of the detection chamber 31.

[0029] Figure 2 、 3 As shown in Figures 4 and 5, in this embodiment, the support base 1 is a long plate body, and the can sealing area 11 is located in the central area of the support base 1. A control valve 6 and a digital pressure gauge 7 are also installed on the support base 1. The control valve 6 and the digital pressure gauge 7 are respectively arranged on the left and right sides of the can sealing area 11. One end of the air intake pipe 12 leads to the center of the can sealing area 11, and the other end of the air intake pipe 12 is connected to the control valve 6. The air intake pipe 12 also leads to a bypass branch 121 connected to the digital pressure gauge 7. This structure improves the overall layout of the product and is conducive to use in combination with detection instruments. The air intake or exhaust operation of the air intake pipe 12 is controlled by the control valve 6, and the bypass branch 121 feeds back the air pressure to the digital pressure gauge 7 based on the connection method, which is conducive to understanding the size of the air pressure filled in the detection chamber 31. In this embodiment, the detection air path 13 and the air intake pipe 12 are distributed in two mutually perpendicular directions. The structure is not only convenient for production and implementation, but also effectively avoids interference.

[0030] In this embodiment, the piston 4 is disc-shaped, with an outer diameter that matches the inner diameter of the chamber 3. A second sealing ring 92 and a third sealing ring 93 are provided on the outer circumference of the piston 4. Two third sealing rings 93 are provided, one above and one below the second sealing ring 92. This creates a three-level seal between the piston 4 and the inner circumferential wall of the chamber 3 in the direction of movement. Furthermore, the second sealing ring 92 is an O-ring, while the third sealing ring 93 is a multi-layer Y-ring. This structure improves sealing performance, and the use of multiple Y-rings prevents leakage, ensuring long-term, reliable use.

[0031] The standard reference tank provided by the utility model utilizes a piston moving within a cavity to construct a detection chamber with adjustable volume. This allows for adjustment according to the volume of the object being measured, allowing for multiple uses. This reduces the number of standard reference tanks with independent fixed volumes, lowering usage costs and reducing the number of replacement steps during testing, greatly improving testing efficiency. Furthermore, the utility model has a simple and compact structure, is easy to implement, does not require a large installation space, and is convenient for storage. Through a reasonable and effective structural design, the structure is stable and reliable, with good sealing properties and no leakage. It can be used safely for a long time and is easy to adjust, facilitating differential pressure sealing testing.

[0032] The above detailed description of the present invention in combination with the implementation methods is only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the scope of protection of the present invention. Therefore, all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. Fine-tunable equivalent volume standard reference tank, characterized by: have: A support base (1), wherein the support base (1) is provided with a can sealing area (11), an air inlet pipe (12) and a detection air path (13) connected to the can sealing area (11); A tank body (2), the tank body (2) being mounted on the support base (1) corresponding to the tank sealing area (11), and the tank body (2) and the support base (1) enclose a cavity (3); A piston (4) is embedded in the cavity (3) and divides the cavity (3) into a detection cavity (31) and a standby cavity (32), wherein the detection cavity (31) is connected to an air inlet line (12) and a detection air line (13) on the support base (1), and the volume of the detection cavity (31) is adjusted according to the movement of the piston (4) in the cavity (3); The identification member (5) is connected to the piston (4). A scale (51) is provided on the identification member (5) so that when the piston (4) moves in the cavity (3), the scale (51) can reflect the volume of the detection cavity (31).

2. The fine-tunable equivalent volume standard reference tank according to claim 1, characterized in that: The tank body (2) includes a tubular tank body (21) and a top cover (22), wherein the top cover (22) covers the upper end of the tubular tank body (21), and the lower end of the tubular tank body (21) covers the sealing area (11); the sealing area (11) has a raised rim (111), which is inserted into the tubular tank body (21) and tightly connected to the inner wall of the tubular tank body; the identification member (5) is a screw rod extending from the top cover (22), and the scale (51) is evenly arranged along the axial direction of the screw rod. The lower end of the screw rod is connected to the piston (4) through a bearing, so that the screw rod can rotate relative to the piston (4) and the axial movement of the screw rod is used to push and pull the piston (4).

3. The fine-tunable equivalent volume standard reference tank according to claim 1, characterized in that: The support base (1) is a long plate body, and the can sealing area (11) is located in the central area of the support base (1). A control valve (6) and a digital pressure gauge (7) are also installed on the support base (1). The control valve (6) and the digital pressure gauge (7) are respectively arranged on the left and right sides of the can sealing area (11). One end of the air intake pipe (12) leads to the center of the can sealing area (11), and the other end of the air intake pipe (12) is connected to the control valve (6). The air intake pipe (12) also leads to a bypass branch (121) connected to the digital pressure gauge (7).

4. The fine-tunable equivalent volume standard reference tank according to claim 2, characterized in that: The lower end of the tubular tank body (21) covers the sealing area (11) and is locked on the support base (1) by a bolt (8). The bolt (8) passes through the support base from the lower side upward and is threadedly connected to the tubular tank body (21). A first sealing ring (91) is embedded between the lower end of the tubular tank body (21) and the support base (1). The first sealing ring (91) is arranged at the outer root of the ring edge (111). The tubular tank body (21) and the support base (1) together clamp and press the first sealing ring (91) in a positive direction.

5. The fine-tunable equivalent volume standard reference tank according to claim 2, characterized in that: The piston (4) is disc-shaped, and the outer diameter of the piston (4) is consistent with the inner diameter of the cavity (3). A second sealing ring (92) and a third sealing ring (93) are provided on the outer periphery of the piston (4). There are two third sealing rings (93) which are respectively provided on the upper and lower sides of the second sealing ring (92), so that the piston (4) forms a three-level seal with the inner peripheral wall of the cavity (3) in the moving direction.

6. The fine-tunable equivalent volume standard reference tank according to claim 5, characterized in that: The second sealing ring (92) is an O-ring, and the third sealing ring (93) is a multi-layer Y-ring.

7. The finely adjustable equivalent volume standard reference tank according to claim 2, characterized in that: The upper end of the screw rod passing through the top cover (22) is provided with a hand wheel (52).

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