Leakage testing device for corrugated pipe sealing element

Abstract

The utility model relates to a leakage testing device for a corrugated pipe sealing element, which comprises the components of a bottom plate which is provided with an upper surface for a corrugated pipe to be vertically placed thereon, and the edge of a lower end pipe orifice of the corrugated pipe is attached to the upper surface of the bottom plate; the cover plate is located above the bottom plate and used for covering an upper end pipe opening of the corrugated pipe so as to close the upper end pipe opening, and the cover plate is provided with a fluid connecting pipe allowing external fluid to be input into the corrugated pipe; the support is arranged on the bottom plate and used for being located beside the corrugated pipe. The pressing piece is arranged on the support and located above the cover plate, and the pressing piece can move downwards or upwards under the action of external force to be pressed on the cover plate or separated from the cover plate. During detection, the corrugated pipe is vertically placed on the bottom plate, the cover plate covers the upper end pipe opening of the corrugated pipe, then external fluid (such as air, kerosene and the like) is input into the corrugated pipe through the fluid connecting pipe on the cover plate, and the pressing piece is pressed downwards on the cover plate, so that whether the fluid in the corrugated pipe leaks or not can be observed, and the operation is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of detection devices, and in particular relates to a leakage testing device for a bellows seal. Background Art

[0002] Bellows seals have been widely used in chemical plants. The corrugated plate of the bellows is generally processed by welding, which may have welding defects and is difficult to inspect.

[0003] To this end, the Chinese invention patent "A control valve packing bellows sealing detection device" with patent number 202311181592.7 and authorization announcement number CN116907749B discloses a detection device, which includes an automatic fixing mechanism, which includes a workbench, a sliding bracket is fixedly installed on the workbench, a bidirectional screw is rotatably installed on the sliding bracket, an upper slider is slidably installed on the sliding bracket, the upper slider and the bidirectional screw form a threaded fit, a double-screw motor is fixedly installed on the sliding bracket, the output shaft of the double-screw motor is fixedly connected to the bidirectional screw, an upper sealing cover is rotatably installed on the upper slider, a lower slider is slidably installed on the sliding bracket, a bellows control valve is fixedly placed on the lower slider, and a trachea port is fixedly installed on the lower slider. Due to the use of an automated fixing device, the valve is automatically fixed, the valve is placed simply and conveniently, and after the valve is placed, pressurization detection can be automatically performed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a leak testing device for a bellows seal in view of the current status of the prior art, which can test whether the bellows has leakage and is easy to operate.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a leak testing device for a bellows seal, characterized in that it includes:

[0006] The bottom plate has an upper surface for the corrugated pipe to be placed vertically thereon, and the edge of the lower end of the corrugated pipe is in contact with the upper surface of the bottom plate;

[0007] The cover plate is located above the bottom plate and is used to cover the upper end of the bellows to close the upper end. At the same time, the cover plate is provided with a fluid connection pipe for inputting external fluid into the bellows.

[0008] A bracket, disposed on the bottom plate and used to be located beside the corrugated pipe;

[0009] The pressing piece arranged on the bracket is located above the cover plate, and the pressing piece can move downward or upward under the action of external force to press on the cover plate or detach from the cover plate.

[0010] During the inspection, place the bellows vertically on the bottom plate, place the cover plate on the upper end of the bellows, then input the external fluid (such as air, kerosene, etc.) into the bellows through the fluid connecting pipe on the cover plate, and press the clamping piece down on the cover plate to observe whether there is leakage of the fluid in the bellows, which is convenient for operation.

[0011] Preferably, the bracket includes a vertical pole, a slider disposed on the vertical pole and capable of moving up and down along the vertical pole, and the pressing member is disposed on the slider.

[0012] Preferably, the pressing member is constrained to the sliding block in a manner that it can move back and forth so as to be relatively close to or away from the side wall of the vertical pole, thereby being able to adjust the position of the pressing member.

[0013] In order to further adjust the position of the clamping piece so as to be suitable for testing bellows of different sizes, it is preferred to further include a connecting arm, a first end of which is constrained to the slider in a manner that allows it to rotate around an axis extending up and down, and a second end of which extends outwardly relative to the side wall of the vertical rod, and the clamping piece is provided on the connecting arm in a manner that allows it to move back and forth along the length direction of the connecting arm.

[0014] In this way, the position of the pressing piece can be adjusted according to the size and placement position of the corrugated tube.

[0015] Preferably, the connecting arm is provided with a channel extending along its length direction, and one end of the channel opens to the second end of the connecting arm;

[0016] A connecting rod is provided on the pressing member, one end of the connecting rod is connected to the pressing member, and the other end of the connecting rod is inserted into the channel from the second end of the connecting arm.

[0017] Preferably, the compression member is spherical and corresponds to the central position of the cover plate. The contact between the spherical compression member and the cover plate is more accurate, and if there are protruding members such as screws on the cover plate, the spherical compression member can avoid the elevation of the protruding members.

[0018] In order to improve the overall structural stability, preferably, the bracket further comprises two columns arranged side by side, the upper ends of the two columns are connected by a first end plate, and the lower ends of the two columns are supported on the bottom plate;

[0019] The vertical rod is a first screw rod with an external thread, which is located between the above-mentioned two columns, and its upper and lower ends are respectively supported on the first end plate and the bottom plate, so that the first screw rod can rotate around its own axis under the action of external force. At the same time, the above-mentioned slider is threadedly connected to the first screw rod; it also includes a guide rod, which is passed through the guide hole on the slider, and the two ends of the guide rod are supported on the first end plate and the bottom plate.

[0020] In this way, the slider can be driven to move up and down by driving the first screw rod to rotate.

[0021] Preferably, both columns are provided with scale marks for indicating the height of the position of the slider. In this way, the columns can play a supporting role and also indicate the height of the position of the slider. Since the utility model has two columns, scale marks of different units (such as metric cm, imperial luch) can be set on the two columns respectively to meet different needs.

[0022] To improve the overall structural stability, it is also preferred that there are two vertical rods arranged side by side on both sides of the corrugated tube, the upper ends of the two vertical rods are connected by a second end plate, and the lower ends of the two vertical rods are supported on the bottom plate;

[0023] The sliding block is arranged on two vertical poles at the same time;

[0024] The cam is connected to the second end plate of the vehicle body by a screw threading machine, and the screw threading machine is connected to the first end plate of the vehicle body by a screw threading machine. The cam is connected to the first end plate of the vehicle body by a screw threading machine, and the cam is connected to the first end plate of the vehicle body by a screw threading machine. The cam is connected to the second end plate of the vehicle body by a screw threading machine, and the cam is connected to the first end plate of the vehicle body by a screw threading machine. The cam is connected to the second end plate of the vehicle body by a screw threading machine, and the cam is connected to the first end plate of the vehicle body by a screw threading machine. The cam is connected to the second end plate of the vehicle body by a screw threading machine, and the cam is connected to the first end plate of the vehicle body by a screw threading machine. The cam is connected to the second end plate of the vehicle body by a screw threading machine, and the cam is connected to the first end plate of the vehicle body by a screw threading machine. The cam is connected to the second end plate of the vehicle body by a screw threading machine, and the cam is connected to the second end plate of the vehicle body by a screw threading machine.

[0025] In this way, the slider can be driven to move up and down by driving the second screw rod.

[0026] Preferably, both uprights are provided with scale marks for indicating the height of the position of the slider.

[0027] In the above schemes, the fluid can be gas or liquid. Preferably, the fluid is gas, and a valve is provided on the fluid pipe to open or close the passage of the fluid pipe.

[0028] It also includes a pressure measuring device for detecting the air pressure in the space enclosed by the bottom plate and the cover plate in the bellows.

[0029] In order to improve the accuracy of the test results, preferably, at least two anti-movement seats are provided on the bottom plate and are attached to the upper surface of the bottom plate by magnetic attraction, so as to surround the outer periphery of the bellows and attach to the side wall of the bellows. In this way, the anti-movement seats can restrain the bellows and prevent the bellows from moving along the upper surface of the base.

[0030] Compared with the prior art, the utility model has the advantages that: by designing the leak test device to have a structure with a base plate, a cover plate, a bracket and a pressing piece, during detection, the bellows is placed vertically on the base plate, the cover plate is placed on the upper end of the bellows, and then the external fluid (such as air, kerosene, etc.) is input into the bellows through the fluid connecting pipe on the cover plate, and the pressing piece is pressed downward on the cover plate, so as to observe whether there is leakage of the fluid in the bellows, which is convenient for operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a diagram of the use state of the first embodiment of the utility model;

[0032] Figure 2 for Figure 1 Side view of the device (omit the bellows, cover plate and pressure measuring device);

[0033] Figure 3 for Figure 2 A top view of

[0034] Figure 4 This is a schematic structural diagram of a cover plate and a pressure measuring device according to Embodiment 1 of the present utility model;

[0035] Figure 5 This is a schematic structural diagram of a slider according to Embodiment 1 of the present utility model;

[0036] Figure 6 for Figure 5 Side view of the middle slider;

[0037] Figure 7 It is a cross-sectional view of a slider according to Embodiment 1 of the present utility model;

[0038] Figure 8 This is a diagram of the connection structure between the pressing member, the connecting arm and the sliding block in the first embodiment of the utility model;

[0039] Fig. 9 This is a schematic structural diagram of a pressing member according to Embodiment 1 of the present utility model;

[0040] Fig.10 It is a cross-sectional view of the connecting arm of the first embodiment of the utility model;

[0041] Fig.11 This is a schematic structural diagram of the connecting arm of the first embodiment of the utility model;

[0042] Fig.12 This is a diagram of the use state of the second embodiment of the utility model;

[0043] Fig.13 for Fig.12 Side view of

[0044] Fig.14 This is a top view of the corrugated tube of the second embodiment of the utility model when it is placed on the bottom plate. DETAILED DESCRIPTION

[0045] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0046] Embodiment 1:

[0047] like Figures 1 to 11 As shown in FIG. 1 , a preferred embodiment of a leak testing device for a bellows seal of the utility model is shown. The leak testing device includes a base plate 1 , a cover plate 3 , a bracket 4 , a pressing member 5 and a pressure measuring device 7 .

[0048] The bottom plate 1 has an upper surface 11 for the corrugated pipe 2 to be placed vertically thereon, and the edge of the lower end of the corrugated pipe 2 is in contact with the upper surface 11 of the bottom plate 1 .

[0049] The cover plate 3 is located above the base plate 1 and is used to cover the upper end of the bellows 2 to close the upper end. At the same time, the cover plate 3 is provided with a fluid connecting pipe 31 for inputting external fluid (air) into the bellows 2; and a valve is provided on the fluid connecting pipe 31 to open or cut off the passage of the fluid connecting pipe 31.

[0050] The pressure measuring device 7 is a pressure gauge externally connected to the fluid connecting pipe 31 , and is used to detect the air pressure in the space enclosed by the bottom plate 1 and the cover plate 3 in the bellows 2 .

[0051] The bracket 4 is arranged on the bottom plate 1 and is located beside the corrugated tube 2. The bracket 4 includes a vertical rod 41, a slider 42 arranged on the vertical rod 41 and capable of moving up and down along the vertical rod 41, and columns 44 arranged side by side on both sides of the vertical rod 41. Figure 2 As shown, the upper ends of the two columns 44 are connected through the first end plate 441, and the lower ends of the two columns 44 are supported on the bottom plate 1 through the third end plate, and the two columns 44 are provided with scale marks for indicating the height of the position of the slider 42; the vertical rod 41 is a first screw rod with external threads, and its upper and lower ends are respectively supported on the first end plate 441 and the third end plate, so that the first screw rod can rotate around its own axis under the action of external force, and the above-mentioned slider 42 is threadedly connected to the first screw rod, and a handwheel is provided at the upper end of the first screw rod, which is located above the first end plate 441 to drive the first screw rod to rotate. At the same time, Figure 1As shown, the bracket 4 of this embodiment also includes a guide rod 45, which is penetrated by a guide hole 421 on the slider 42 (the structure of the slider 42 is as shown in FIG. Figure 5 , 6 , 7), and both ends of the guide rod 45 are supported on the first end plate 441 and the third end plate, so that the slider 42 can be driven to move up and down when the first screw rod rotates.

[0052] like Figure 8 As shown, the pressing member 5 is arranged on the slider 42 and above the cover plate 3 through the connecting arm 43, so that it can move downward or upward with the slider 42 to press on the cover plate 3 or detach from the cover plate 3. Specifically, as Figure 6 , 7 As shown in FIGS. 8, 10 and 11, the first end of the connecting arm 43 is constrained to the slider 42 in a manner that it can rotate around an axis extending up and down, and the second end of the connecting arm 43 extends outward relative to the side wall of the vertical rod 41, and a channel 430 extending along the length direction of the connecting arm 43 is provided in the connecting arm 43, and one end of the channel 430 opens at the second end of the connecting arm 43; Fig. 9 As shown, the pressing member 5 is spherical, and a connecting rod 51 is provided on the pressing member 5. One end of the connecting rod 51 is connected to the pressing member 5, and the other end of the connecting rod 51 is inserted into the channel 430 from the second end of the connecting arm 43, so that the pressing member 5 can move laterally relative to the vertical rod 41 to move closer to or away from the side wall of the vertical rod 41, and can also rotate circumferentially relative to the vertical rod 41 to adjust its position. The movable direction of the pressing member is as shown in FIG. Figure 3 During the leak test, the pressing member 5 is arranged at the center of the cover plate 3 .

[0053] During the inspection, the bellows 2 is placed vertically on the base plate 1, and the cover plate 3 is placed on the upper end of the bellows 2. Then, the outside air is input into the bellows 2 through the fluid connecting pipe 31 on the cover plate 3, and the pressing piece 5 is pressed downward on the cover plate 3. The pressure measuring device 7 can be used to observe whether there is any leakage of air in the bellows 2, which is convenient for operation.

[0054] In order to prevent air from leaking from the joint between the edge of the lower end of the bellows 2 and the upper surface 11 of the bottom plate 1, kerosene may be dripped at the joint to seal the joint.

[0055] In order to prevent the slider from moving during detection, a locking piece can be set on the first screw rod. When the locking piece is unlocked, the first screw rod can rotate under the drive of the hand wheel. When the locking piece is locked, the first screw rod can be restricted from rotating. The locking piece can refer to the existing locking structure design and will not be described in detail here.

[0056] Embodiment 2:

[0057] like Figures 12-14As shown, it is a preferred embodiment 2 of a leak test device for a bellows seal of the utility model. This embodiment is basically the same as the embodiment 1, except that the structure of the bracket 4 in this embodiment is different. Specifically, the bracket of this embodiment includes two vertical rods 41 and a slider 42. The two vertical rods 41 are arranged side by side on both sides of the bellows 2. The upper ends of the two vertical rods 41 are connected by a second end plate 411, and the lower ends of the two vertical rods 41 are supported on the bottom plate 1. The slider 42 is constrained between the two vertical rods 41 in a manner that it can move up and down along the vertical rods 41, and the central position of the slider 42 is provided below the clamping member 5. Both vertical rods 41 are provided with scale marks for indicating the height of the position of the slider 42.

[0058] In order to drive the slider 42 to move up and down, the present embodiment also includes a horizontally placed second screw rod 6, a first connecting rod 61 and a second connecting rod 62 arranged in a V shape, and a third connecting rod 63 and a fourth connecting rod 64 arranged in an inverted V shape. After the lower end of the first connecting rod 61 and the lower end of the second connecting rod 62 are rotatably connected, they are constrained together with the slider 42 as the tip of the V shape. After the upper end of the third connecting rod 63 and the upper end of the fourth connecting rod 64 are rotatably connected, they are constrained together with the second end plate 411 as the tip of the inverted V shape. After the upper end of the first connecting rod 61 and the lower end of the third connecting rod 63 are rotatably connected, they are threadedly connected to the second screw rod 6 as a first connecting portion 65. After the upper end of the second connecting rod 62 and the lower end of the fourth connecting rod 64 are rotatably connected, they are threadedly connected to the second screw rod 6 as a second connecting portion. Therefore, when the second screw rod 6 rotates around its own axis under the action of external force, it can drive the first connecting portion 65 and the second connecting portion 66 to be relatively close to or away from each other, thereby driving the tip of the V shape to move up and down together with the slider 42. In this embodiment, a hand wheel is provided at one end of the second screw rod 6 to drive the second screw rod 6 to rotate.

[0059] At the same time, the present embodiment also includes two anti-movement seats 8, which are arranged on the base plate 1 and are fitted together with the upper surface 11 of the base plate 1 by magnetic attraction, so as to surround the outer periphery of the bellows 2 and fit with the side walls of the bellows 2, thereby avoiding horizontal displacement of the bellows and improving test accuracy.

Claims

1. A leak testing device for a bellows seal, characterized in that Included are: The bottom plate (1) has an upper surface (11) for the corrugated pipe (2) to be placed vertically thereon, and the edge of the lower end of the corrugated pipe (2) is in contact with the upper surface (11) of the bottom plate (1); A cover plate (3) is located above the bottom plate (1) and is used to cover the upper end of the bellows (2) to close the upper end. At the same time, a fluid connection port (31) is provided on the cover plate (3) for inputting external fluid into the bellows (2); A bracket (4) is arranged on the bottom plate (1) and is used to be located beside the corrugated pipe (2); The pressing member (5) arranged on the bracket (4) is located above the cover plate (3), and the pressing member (5) can move downward or upward under the action of an external force to press on the cover plate (3) or detach from the cover plate (3).

2. The leak test device according to claim 1, characterized in that: The bracket (4) comprises a vertical rod (41), a slider (42) arranged on the vertical rod (41) and capable of moving up and down along the vertical rod (41), and the pressing member (5) is arranged on the slider (42).

3. The leak test device according to claim 2, characterized in that: The pressing member (5) is constrained to the sliding block (42) in a manner that allows it to move back and forth so as to be relatively close to or away from the side wall of the vertical rod (41).

4. The leak test device according to claim 3, characterized in that: It also includes a connecting arm (43), a first end of which is constrained to the slider (42) in a manner that allows it to rotate around an axis extending up and down, and a second end of which extends outwardly relative to the side wall of the vertical rod (41), and the pressing member (5) is arranged on the connecting arm (43) in a manner that allows it to move back and forth along the length direction of the connecting arm (43).

5. The leak test device according to claim 4, characterized in that: The pressing piece (5) is spherical and corresponds to the central position of the cover plate (3).

6. The leak testing device according to claim 2, characterized in that: The support (4) further comprises two columns (44) arranged side by side, the upper ends of the two columns (44) are connected via a first end plate (441), and the lower ends of the two columns (44) are supported on the bottom plate (1); The vertical rod (41) is a first screw rod with an external thread, which is located between the two vertical columns (44), and its upper and lower ends are respectively supported on the first end plate (441) and the bottom plate (1), so that the first screw rod can rotate around its own axis under the action of external force. At the same time, the first screw rod is threadedly connected with the above-mentioned slider (42); it also includes a guide rod (45) that passes through a guide hole (421) on the slider (42), and the two ends of the guide rod (45) are supported on the first end plate (441) and the bottom plate (1).

7. The leak test device according to claim 6, characterized in that: The two upright posts (44) are both provided with scale marks for indicating the height of the position of the slider (42).

8. The leak testing device according to claim 2, characterized in that: There are two vertical rods (41) arranged side by side on both sides of the corrugated tube (2); the upper ends of the two vertical rods (41) are connected via a second end plate (411); and the lower ends of the two vertical rods (41) are supported on the bottom plate (1); The sliding block (42) is arranged on two vertical rods (41) at the same time; The invention also comprises a second threaded rod (6) placed horizontally, a first connecting rod (61) and a second connecting rod (62) arranged in a V shape, and a third connecting rod (63) and a fourth connecting rod (64) arranged in an inverted V shape, wherein the lower end of the first connecting rod (61) and the lower end of the second connecting rod (62) are rotatably connected to each other and are constrained together with the slider (42) as a tip of the V shape, and the upper end of the third connecting rod (63) and the upper end of the fourth connecting rod (64) are rotatably connected to each other and are constrained together with the second end plate (411) as a tip of the inverted V shape, and the first connecting rod (61) and the fourth connecting rod (64) are rotatably connected to each other and are constrained together with the second end plate (411) as a tip of the inverted V shape, and the first connecting rod (61) and the fourth connecting rod (64) are rotatably connected to each other and are constrained together with the slider (42) as a tip of the V shape, and the first connecting rod (61) and the fourth connecting rod (64) are rotatably connected to each other and are constrained together with the second end plate (411) as a tip of the inverted ... The upper end of the second connecting rod (62) and the lower end of the fourth connecting rod (64) are rotatably connected to each other and serve as a first connecting portion (65) to be threadedly connected to the second screw rod (6); the upper end of the second connecting rod (62) and the lower end of the fourth connecting rod (64) are rotatably connected to each other and serve as a second connecting portion to be threadedly connected to the second screw rod (6), so that when the second screw rod (6) rotates around its own axis under the action of an external force, it can drive the first connecting portion (65) and the second connecting portion (66) to move relatively closer or farther away, thereby driving the tip of the V-shape to move up and down together with the slider (42).

9. The leak test device according to any one of claims 1 to 8, characterized in that: The fluid is gas, and a valve is provided on the fluid connecting pipe (31) to open or close the passage of the fluid connecting pipe (31); It also includes a pressure measuring device (7) for detecting the air pressure in the space enclosed by the bottom plate (1) and the cover plate (3) in the bellows (2).

10. The leak test device according to any one of claims 1 to 8, characterized in that: It also includes at least two anti-movement seats (8) which are arranged on the bottom plate (1) and are attached to the upper surface (11) of the bottom plate (1) by means of magnetic attraction so as to surround the outer periphery of the bellows (2) and attach to the side wall of the bellows (2).

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