A mechanical seal air tightness testing device

Abstract

The invention provides a mechanical seal air tightness detection device, which belongs to the technical field of seal air tightness detection. The mechanical seal air tightness detection device comprises a lower shell body and an upper shell body, wherein a fixing plate is fixedly installed inside the lower shell body, and a mounting disk is slidably installed on the top of the upper shell body along the up and down directions. The fixed clamping device also comprises two fixing disks and a locking assembly, wherein the two fixing disks are coaxial and respectively located above the fixing plate and below the mounting disk, and the locking assembly comprises two threaded sleeves, a transmission rod and a clamping block, wherein the two threaded sleeves are respectively fixedly installed on the fixing plate and the mounting disk and are coaxial with the fixing disk, the two transmission rods are respectively threadedly sleeved in the two threaded sleeves, the clamping blocks have a plurality of outer walls surrounding one end of the two transmission rods close to each other, and two connecting rods are arranged on the clamping blocks, so as to avoid unstable contact between a moving ring and a static ring when the two rings rotate relative to each other, thereby preventing the occurrence of misjudgment of poor sealing.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing airtightness detection, and in particular relates to a mechanical sealing airtightness detection device. Background Art

[0002] Mechanical seal refers to a device that prevents fluid leakage by at least one pair of end faces perpendicular to the axis of rotation, which are kept in close contact and slide relative to each other under the action of fluid pressure and the elastic force of the compensation mechanism and the cooperation of auxiliary seals. Its working principle is to rely on the two end faces of the static ring and the dynamic ring to be pressed tightly, and the two end faces are sealed axially under the action of fluid pressure and the spring pressure of the compensation mechanism, thereby preventing fluid leakage. The airtightness of mechanical seals needs to be tested during the production and manufacturing of mechanical seals.

[0003] An application document with application publication number CN111504558A discloses a pneumatic detection device for mechanical seal air tightness, including a bracket, a lifting support mechanism, a pressing mechanism and a detection cover. A detection cover with an open top is placed on the upper part of the bracket, and water is contained in the detection cover. A vertical lifting support mechanism is provided above the bracket, and a pressing mechanism for longitudinally outputting power is installed on the top of the lifting support mechanism. A tooling base is provided below the pressing mechanism, and both sides of the tooling base are longitudinally slidably installed on the lifting support mechanism. An inflation device is connected to the tooling base through a pipeline, and a sealing ring to be tested is placed on the upper part of the tooling base.

[0004] When testing the air tightness of a mechanical seal, it is necessary to simulate its use environment, install it, inject pressure medium into the mechanical seal, and observe the pressure changes. Based on the pressure changes or the indication of the leak detector, determine whether the mechanical seal has a leakage problem.

[0005] The existing testing equipment is not convenient for installing and disassembling mechanical seals, and the mechanical seal device cannot be quickly adjusted according to actual conditions, which makes the dynamic ring and static ring of the mechanical seal device easily lead to unstable contact due to installation problems during testing, resulting in misjudgment of poor sealing, and cannot adapt to mechanical seal devices of different models and sizes. Summary of the invention

[0006] The purpose of the present invention is to provide a mechanical seal air tightness detection device, aiming to solve the problem that the installation and disassembly of mechanical seals in the prior art are inconvenient, which makes the dynamic ring and static ring of the mechanical seal device easily lead to unstable contact due to installation problems during detection, resulting in the misjudgment of poor sealing.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mechanical seal airtightness detection equipment, comprising a lower shell, an upper shell and a mechanical seal device, the mechanical seal device comprising a coaxially arranged dynamic seal and a static seal, a fixed plate is fixedly installed inside the lower shell, a mounting plate is slidably installed on the top of the upper shell along the up and down directions, and also includes a fixed clamping device.

[0008] The fixed clamping device includes two fixed disks and a locking assembly. The two fixed disks are coaxial and respectively located above the fixed plate and below the mounting disk. The mechanical sealing device is located between the two fixed disks. The locking assembly includes two threaded sleeves, a transmission rod and a clamping block. The two threaded sleeves are respectively fixedly mounted on the fixed plate and the mounting disk and are coaxial with the fixed disk. The two transmission rods are respectively threadedly sleeved in the two threaded sleeves. One end of the two transmission rods passes through the fixed plate and the mounting disk respectively. The clamping blocks have multiple outer walls surrounding one end of the two transmission rods close to each other. Two connecting rods are provided on the clamping block. One end of the two connecting rods is hinged to the clamping block, and the other end of the two connecting rods is hinged to the threaded sleeve and the outer wall of the transmission rod.

[0009] The locking assembly also includes two adjusting nuts, which are respectively fixedly mounted on the bottom of the fixing plate and the top of the mounting plate, and are respectively threadedly sleeved on the two transmission rods.

[0010] The effect is that by arranging the locking assembly, the inner wall of the mechanical sealing device can be self-centeringly clamped, and by controlling the mounting plate to slide up and down, the two fixed plates can be controlled to approach each other, so that the dynamic ring and the static ring of the mechanical sealing device can be pressed together, and by rotating the transmission rod, the dynamic ring of the mechanical sealing device is driven to rotate relative to the static ring, thereby simulating the working state of the mechanical sealing device to perform an air tightness test on it, so that when the device performs an air tightness test on the mechanical sealing device, the dust between the dynamic ring and the static ring can be eliminated, which causes the unstable contact between the dynamic ring and the static ring when the dynamic ring and the static ring rotate relative to each other, thereby avoiding the unstable contact between the dynamic ring and the static ring when the dynamic ring and the static ring rotate relative to each other, resulting in the misjudgment of poor sealing, and improving the detection accuracy of the device.

[0011] The fixing clamping device also includes a connecting shaft, which is located between the two transmission rods and is coaxial with the transmission rods. One end of the connecting shaft is fixedly connected to the end of one of the transmission rods, and the other end of the connecting shaft slides through the end of the other transmission rod.

[0012] The effect is that when the static seal and the dynamic seal of the mechanical seal device are self-centering and clamped, the two transmission rods can be made coaxial through the action of the connecting shaft, thereby ensuring that the static seal and the dynamic seal of the mechanical seal device can be coaxial, avoiding misalignment between the static seal and the dynamic seal of the mechanical seal device, which may lead to misjudgment of poor sealing during detection, and improving the detection accuracy of the device.

[0013] A mounting sleeve is fixedly installed on the top of the fixing plate, and an annular sleeve is fixedly installed and slidably installed on the bottom of the mounting plate and passes through the top of the upper shell body. The mounting sleeve and the annular sleeve are coaxial with the fixing plate, and a connecting sleeve with one end fixedly connected to the fixing plate is slidably sleeved inside the mounting sleeve and the annular sleeve. Elastic parts are provided inside the two connecting sleeves, one end of the two elastic parts are respectively fixedly connected to the two fixing plates, and the other ends of the two elastic parts are respectively fixedly connected to the fixing plate and the mounting plate.

[0014] The effect is that when the locking assembly performs self-centering clamping on the mechanical sealing device, the two elastic parts can be compressed under the action of the mechanical sealing device. When the locking assembly completes clamping of the mechanical sealing device, the two elastic parts begin to reset and drive the two fixed disks to move toward the mechanical sealing device, ensuring that the dynamic ring and the static ring of the mechanical sealing device can be tightly closed.

[0015] A conical groove is provided on the opposite side of the two fixed disks, a coaxial annular groove is provided in the middle of the conical groove, a coaxial through hole is provided in the middle of the annular groove, and the transmission rod passes through the fixed disk through the through hole and extends into the inner cavity of the mechanical sealing device.

[0016] The effect is that the end portions of the two ends of the mechanical sealing device can contact with the annular groove, and the sealing ring of the mechanical sealing device can contact with the groove wall of the conical groove, thereby ensuring the sealing between the two ends of the mechanical sealing device and the two fixed disks, and avoiding the liquid or gas from entering the mechanical sealing device through the gap between the mechanical sealing device and the fixed disk during detection, thereby causing the occurrence of misjudgment of poor sealing during detection, thereby improving the detection accuracy of the device.

[0017] A support ring is fixedly installed in the middle of the outer wall of the lower shell, the upper shell is slidably sleeved on the lower shell in the up-down direction, the bottom of the upper shell contacts the support ring, and a driving component for driving the mounting plate to move in the up-down direction is installed on the upper shell.

[0018] The driving assembly includes a limit ring, an inner gear ring, a mounting ring, a screw and a gear. The limit ring is fixedly installed on the top of the upper shell body, the limit ring is sleeved on the outer side of the mounting plate and is coaxial with it, the inner gear ring is rotatably installed on the inner wall of the limit ring and is coaxial with it, the top of the inner gear ring is fixedly installed with a push plate whose top extends out of the limit ring, the mounting ring is rotatably sleeved on the outer wall of the mounting plate, the axis of the screw is parallel to the axis of the mounting ring and is rotatably installed on the top of the upper shell body, the top of the screw passes through the mounting ring, there are at least two screws and are evenly distributed along the circumferential direction of the mounting ring, the gear is located at the bottom of the mounting ring and is meshed with the inner gear ring, and the gear is fixedly sleeved on the outer wall of the screw.

[0019] The effect is that, by setting up a driving assembly, the mounting ring and the mounting plate can be driven to move in the direction close to the mechanical sealing device, exerting pressure on the contact between the dynamic ring and the static ring, thereby eliminating the situation where dust on the dynamic ring and the static ring causes unstable contact between the two when the dynamic ring and the static ring rotate relative to each other, resulting in misjudgment of poor sealing during detection, thereby improving the detection accuracy of the device.

[0020] A locking device for fixing the upper shell to the lower shell is installed on the lower shell, and the locking device includes a fixing rod and a fixing column extending in the up-down direction. There are at least two fixing rods and they are evenly distributed along the circumferential direction of the lower shell. A buckle is provided on the side of the top of the fixing rod close to the upper shell, and the buckle abuts against the top of the upper shell. The axis of the fixing column is perpendicular to the axis of the lower shell. One end of the fixing column slides through the fixing rod and is fixedly connected to the outer wall of the lower shell. There are at least two fixing columns on the same fixing rod.

[0021] A limit plate is fixedly installed on one end of the fixing column away from the lower shell body, a locking spring is installed between the limit plate and the fixing rod, the locking spring is sleeved on the outer wall of the fixing column, and the two ends of the locking spring are fixedly connected to the fixing rod and the limit plate respectively.

[0022] The effect is that the upper shell can be pressed against the lower shell, avoiding the mutual sliding between the upper shell and the lower shell during the airtightness test of the mechanical seal device, which causes a gap between the static ring and the dynamic ring of the mechanical seal device, thereby causing a misjudgment of a poor seal during the test, thereby improving the detection accuracy of the device.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By setting a locking assembly, the inner wall of the mechanical seal device can be self-centeringly clamped. By controlling the installation plate to slide up and down, the two fixed plates can be controlled to approach each other, so that the dynamic ring and the static ring of the mechanical seal device can be close together. By rotating the transmission rod, the dynamic ring of the mechanical seal device is driven to rotate relative to the static ring, thereby simulating the working state of the mechanical seal device to perform air tightness detection on it. When the device performs air tightness detection on the mechanical seal device, dust between the dynamic ring and the static ring is eliminated, which causes unstable contact between the dynamic ring and the static ring when the dynamic ring and the static ring rotate relative to each other, thereby avoiding the unstable contact between the dynamic ring and the static ring when the dynamic ring and the static ring rotate relative to each other, resulting in misjudgment of poor sealing, and improving the detection accuracy of the device.

[0025] 2. By setting a fixed plate and a locking assembly, when installing and disassembling the mechanical sealing device, it is only necessary to remove the upper shell from the lower shell, and then rotate the transmission rod to complete the installation and disassembly of the mechanical sealing device, thereby solving the problem in the prior art that the airtightness detection device cannot be quickly adapted to the mechanical sealing device, and is inconvenient to install and adjust during detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of the airtightness detection device in the present invention;

[0028] Figure 2 It is a cross-sectional structural schematic diagram of the airtightness detection device in the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of the mechanical seal in the present invention;

[0030] Figure 4 It is a schematic structural diagram of the clamping device of the mechanical seal in the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the fixed component of the mechanical seal in the present invention;

[0032] Figure 6 It is a schematic diagram of the clamping assembly of the mechanical seal in the present invention.

[0033] In the figure: 1, lower base; 11, lower shell; 111, support ring; 12, fixing plate; 121, mounting sleeve; 13, supporting plate; 2, upper base; 21, upper shell; 22, limiting ring; 23, inner gear ring; 231, push plate; 24, mounting ring; 25, screw; 26, gear; 27, mounting plate; 271, annular sleeve; 3, locking device; 31, fixing rod; 311, buckle; 32, fixing column; 33, limiting plate; 34, locking spring; 4, fixing Clamping device; 41. fixing plate; 411. conical groove; 412. annular groove; 413. through hole; 42. connecting sleeve; 43. elastic member; 44. locking assembly; 441. threaded sleeve; 442. transmission rod; 443. adjusting nut; 444. clamping block; 445. connecting rod; 45. connecting shaft; 5. mechanical sealing device; 51. dynamic seal; 511. dynamic ring; 512. spring seat; 513. elastic element; 52. static seal; 521. static ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 6 The present invention provides the following technical solutions: a mechanical seal air tightness detection device, comprising a lower base 1, an upper base 2, a locking device 3 for locking and fixing the upper base 2 on the lower base 1, a fixing clamping device 4 and a mechanical seal device 5 to be detected.

[0036] refer to Figure 1 and Figure 2 As shown, the lower base 1 includes a lower shell 11 , a fixing plate 12 and a supporting plate 13 .

[0037] In this embodiment, the lower shell 11 is cylindrical and has an opening at the top. A support ring 111 is fixedly installed in the middle of the outer wall of the lower shell 11 for supporting the upper base 2 .

[0038] In this embodiment, the fixing plate 12 is a circular plate, which is fixedly installed inside the lower shell 11 and is coaxial with the lower shell 11 . A mounting sleeve 121 coaxial with the fixing plate 12 is fixedly installed on the top of the fixing plate 12 .

[0039] In this embodiment, the support plate 13 is a circular plate, which is disposed above the fixed plate 12 in the air and is coaxial with the fixed plate 12 . A circular groove coaxial with the support plate 13 is provided in the middle of the support plate 13 for communicating with the inner hole of the mounting sleeve 121 .

[0040] refer to Figure 1 and Figure 2 As shown, the upper base 2 includes an upper shell 21, a mounting plate 27 located on the top of the upper shell 21, and a driving assembly for driving the mounting plate 27 to slide in the up and down directions.

[0041] In this embodiment, the upper shell 21 is cylindrical and has an opening at the bottom. The upper shell 21 is sleeved on the top of the lower shell 11 and is coaxially arranged with the lower shell 11. The bottom of the upper shell 21 abuts against the top of the support ring 111 on the outer wall of the lower shell 11, and the top of the upper shell 21 is provided with a circular hole coaxial with the upper shell 21.

[0042] The mounting plate 27 is coaxially arranged with the upper shell 21 . An annular sleeve 271 is fixedly installed at the bottom of the mounting plate 27 . The annular sleeve 271 is coaxial with the upper shell 21 and is slidably sleeved in the circular hole along the axial direction of the upper shell 21 .

[0043] The driving assembly includes a limiting ring 22 , an inner gear ring 23 , a mounting ring 24 , a screw rod 25 and a gear 26 .

[0044] The limiting ring 22 is fixedly mounted on the top of the upper shell 21 , and the limiting ring 22 is sleeved on the outer side of the mounting plate 27 and is coaxial therewith.

[0045] The inner gear ring 23 is rotatably mounted on the inner wall of the limiting ring 22 and is coaxial therewith. A push plate 231 is fixedly mounted on the top of the inner gear ring 23 and extends out of the limiting ring 22 . The number of the push plate 231 is at least one.

[0046] The mounting ring 24 is rotatably sleeved on the outer wall of the mounting plate 27 , an annular groove is provided on the inner ring wall of the mounting ring 24 , and the edge of the mounting plate 27 is rotatably sleeved in the annular groove.

[0047] The axis of the screw rod 25 is parallel to the axis of the mounting ring 24 and is rotatably mounted on the top of the upper housing 21 . The top thread of the screw rod 25 penetrates the mounting ring 24 . There are at least two screw rods 25 and they are evenly distributed along the circumference of the mounting ring 24 .

[0048] The gear 26 is located at the bottom of the mounting ring 24 and is meshed with the inner gear ring 23 . The gear 26 is coaxial with the screw rod 25 and is fixedly sleeved on the outer wall of the screw rod 25 .

[0049] refer to Figure 1 and Figure 2 As shown, the locking device 3 includes a fixing rod 31 extending in the up-down direction, a fixing column 32 , a limiting plate 33 and a locking spring 34 .

[0050] There are at least two fixing rods 31 evenly distributed along the circumference of the lower shell 11 . A buckle 311 is provided on the top of the fixing rod 31 close to the upper shell 21 . The buckle 311 abuts against the top of the upper shell 21 .

[0051] The axis of the fixing column 32 is perpendicular to the axis of the lower shell 11 . One end of the fixing column 32 slides through the fixing rod 31 and is fixedly connected to the outer wall of the lower shell 11 . There are at least two fixing columns 32 on the same fixing rod 31 .

[0052] The axis of the limiting plate 33 coincides with the axis of the fixing column 32 , and the limiting plate 33 is fixedly mounted on an end of the fixing column 32 away from the upper housing 21 .

[0053] The locking spring 34 is sleeved on the outer wall of the fixing column 32 , and two ends of the locking spring 34 are fixedly connected to the fixing rod 31 and the limiting plate 33 respectively.

[0054] refer to Figure 3 As shown, the mechanical sealing device 5 includes a dynamic seal 51 and a static seal 52 which are coaxially arranged.

[0055] A spring seat 512 is sleeved on one end of the dynamic seal 51 close to the static seal 52, and a plurality of elastic elements 513 evenly distributed along the circumferential direction of the dynamic seal 51 are installed between the end of the spring seat 512 away from the static seal 52 and the dynamic seal 51. A dynamic ring 511 is fixedly installed on one end of the spring seat 512 close to the static seal 52.

[0056] A static ring 521 that contacts the dynamic ring 511 is installed at one end of the static seal 52 close to the dynamic seal 51 .

[0057] refer to Figure 2-Figure 6 As shown, the fixing clamping device 4 includes a fixing unit, a locking assembly 44 and a connecting shaft 45 .

[0058] refer to Figure 2-Figure 5 As shown, the clamping unit includes a fixing plate 41, a connecting sleeve 42 and an elastic member 43, and there are two fixing plates 41, two connecting sleeves 42 and two elastic members 43.

[0059] The two fixed disks 41 are respectively installed above the mounting sleeve 121 and below the annular sleeve 271 and are coaxial with the mounting sleeve 121 and the annular sleeve 271. Conical grooves 411 are provided on opposite sides of the two fixed disks 41. An annular groove 412 coaxial with the conical groove 411 is provided in the middle thereof. A through hole 413 coaxial with the annular groove 412 is provided in the middle thereof. The mechanical sealing device 5 is installed between the two fixed disks 41 and is coaxial with the fixed disks 41. The dynamic seal 51 contacts the fixed disk 41 on the annular sleeve 271, and the static seal 52 contacts the fixed disk 41 on the mounting sleeve 121.

[0060] The two connecting sleeves 42 are respectively slidably sleeved in the mounting sleeve 121 and the annular sleeve 271 along the axial direction of the mounting sleeve 121 . One end of the two connecting sleeves 42 close to the fixed plate 41 extends out of the mounting sleeve 121 and the annular sleeve 271 and is respectively fixedly connected to the two fixed plates 41 .

[0061] The two elastic members 43 are respectively installed in the two connecting sleeves 42, one end of the two elastic members 43 is respectively fixedly connected to the two fixing plates 41, and the other ends of the two elastic members 43 are respectively fixedly connected to the fixing plate 12 and the mounting plate 27. The two elastic members 43 are springs in this embodiment, and can be elastic telescopic rods, elastic rubber tubes, etc. in other embodiments.

[0062] refer to Figure 2-Figure 4 and Figure 6 As shown, the locking assembly 44 includes a threaded sleeve 441, a transmission rod 442, an adjusting nut 443, a clamping block 444 and a connecting rod 445, wherein there are two threaded sleeves 441, two transmission rods 442 and two adjusting nuts 443.

[0063] The two threaded sleeves 441 are coaxial with the lower shell 11 , one end of the two threaded sleeves 441 is fixedly mounted on the fixing plate 12 and the mounting plate 27 , respectively, and the threads of the two threaded sleeves 441 are respectively arranged on the inner tube walls thereof.

[0064] The two transmission rods 442 are respectively sleeved in the two threaded sleeves 441, and one end of the two transmission rods 442 located inside the threaded sleeves 441 are both threaded rods and are respectively threadedly connected with the two threaded sleeves 441. The ends of the two transmission rods 442 that are away from each other slide through the fixed plate 12 and the mounting plate 27 respectively, and one end of one of the transmission rods 442 that penetrates the mounting plate 27 is connected to the output shaft of the external motor through a coupling. Specifically, the connection can be made through a coupling, or one end of the transmission rod 442 can be directly welded to the output shaft of the external motor.

[0065] The two adjusting nuts 443 are respectively fixedly mounted on the bottom of the fixing plate 12 and the top of the mounting plate 27 and are respectively threadedly sleeved on the threaded rods of the two transmission rods 442 .

[0066] There are multiple clamping blocks 444 that surround the outer walls of one end of the two transmission rods 442 that are close to each other. There are at least three clamping blocks 444 on each transmission rod 442 and they are evenly distributed along the circumference of the transmission rod 442.

[0067] One end of the connecting rod 445 is hinged on the side wall of the clamping block 444 close to the transmission rod 442. Each clamping block 444 has two hinged connecting rods 445. The other ends of the two connecting rods 445 are respectively hinged to the threaded sleeve 441 and the outer wall of one end of the transmission rod 442 away from the adjusting nut 443.

[0068] The connecting shaft 45 is located between the two transmission rods 442 and is coaxial with the transmission rods 442 . One end of the connecting shaft 45 is fixedly connected to the end of one of the transmission rods 442 , and the other end of the connecting shaft 45 slides through and extends into the end of the other transmission rod 442 .

[0069] The implementation principle of the embodiment of the present invention is: when the air tightness of the mechanical sealing device 5 is tested, the two fixing rods 31 are first pulled away from the lower shell 11 and the locking springs 34 are compressed. Then the upper base 2 is removed from the lower base 1, and the fixing rods 31 are loosened to reset under the action of the locking springs 34.

[0070] The end of the static seal 52 away from the static ring 521 is installed in the conical groove 411 of the fixed plate 41, and the end of the static seal 52 is in contact with the bottom wall of the annular groove 412. At this time, the static seal 52 is located outside the locking assembly 44. Then, the transmission rod 442 on the lower base 1 is rotated to move toward the fixed plate 12 through the threaded connection with the threaded sleeve 441. At this time, the transmission rod 442 drives the connecting rod 445 hinged thereon to move toward the direction of the threaded sleeve 441. At this time, the clamping block 444 moves toward the inner wall of the static seal 52 under the action of the connecting rod 445, so that the three clamping blocks 444 are clamped against the static seal 52. The seal 52 is self-centering and clamped, and then the dynamic seal 51 is placed above the static seal 52, and the dynamic ring 511 on the dynamic seal 51 is in contact with the static ring 521 on the static seal 52; the two fixing rods 31 are pulled away from the lower shell 11, and the locking spring 34 is compressed, the upper base 2 is installed on the lower base 1, and the transmission rod 442 on the upper base 2 is connected to the transmission rod 442 on the lower base 1 through the action of the connecting shaft 45. At this time, the bottom of the upper shell 21 is in contact with the support ring 111 of the outer wall of the lower shell 11, and the fixing rod 31 is loosened so that it is under the action of the locking spring 34. The upper base 2 is fixed to the lower base 1 by the buckle 311 on the fixing rod 31; the transmission rod 442 on the upper base 2 is rotated to move toward the mounting plate 27 through the threaded connection with the threaded sleeve 441, and the transmission rod 442 drives the connecting rod 445 hinged thereon to move toward the threaded sleeve 441. At this time, the clamping block 444 moves toward the inner wall of the dynamic seal 51 under the action of the connecting rod 445, so that the three clamping blocks 444 clamp the dynamic seal 51 in a self-centering manner, and then the inner gear ring 23 is driven to rotate through the push plate 231, and the inner gear ring 23 is screwed with the gear 26. The threaded connection drives the screw 25 to rotate, and the screw 25 drives the mounting ring 24 and the mounting plate 27 to move toward the direction close to the mechanical seal device 5 through the threaded connection with the mounting ring 24. At this time, the fixed plate 41 on the upper base 2 cooperates with the locking assembly 44 and the elastic member 43, so that the dynamic seal 51 and the static seal 52 of the mechanical seal device 5 are respectively in contact with the annular grooves 412 on the two fixed plates 41, and the sealing rings on the outer sides of the dynamic seal 51 and the static seal 52 are in conflict with the groove walls of the conical grooves 411 on the two fixed plates 41, and at the same time, the dynamic ring 511 of the dynamic seal 51 and the static ring 521 of the static seal 52 are in conflict.

[0071] At this time, the closed cavity formed by the lower shell 11 and the upper shell 21 is filled with liquid or gas, and then the pressure change in the closed cavity is monitored, and the external motor is started to drive the transmission rod 442 on the upper base 2 to rotate. Since the clamping block 444 connected to the transmission rod 442 has already conflicted with the dynamic seal 51, as the transmission rod 442 rotates, the transmission rod 442 can no longer slide along the axial direction of the threaded sleeve 441, and can only drive the threaded sleeve 441, the mounting plate 27 and the dynamic seal 51 to rotate. Therefore, the device can simulate the working state of the mechanical sealing device 5 to perform an airtightness test on it.

[0072] When it is monitored that the pressure in the closed cavity becomes smaller, it indicates that leakage occurs at the dynamic ring 511 and the static ring 521 of the mechanical seal device 5. At this time, the push plate 231 drives the inner gear ring 23 to rotate, and the inner gear ring 23 drives the screw 25 to rotate through the threaded connection with the internal gear 26. The screw 25 drives the mounting ring 24 and the mounting plate 27 to move toward the mechanical seal device 5 through the threaded connection with the mounting ring 24, and applies pressure to the contact between the dynamic ring 511 and the static ring 521, and eliminates the situation that the dust in the dynamic ring 511 and the static ring 521 causes unstable contact between the two when the dynamic ring 511 and the static ring 521 rotate relative to each other. Then, the dynamic ring 511 and the static ring 521 are driven to rotate relative to each other again, and the pressure change in the closed cavity is monitored. When it is monitored that the pressure in the closed cavity becomes smaller, it indicates that there is a manufacturing defect in the mechanical seal device 5. When it is monitored that the pressure in the closed cavity does not change, it indicates that there is no manufacturing defect in the mechanical seal device 5.

[0073] The inner wall of the mechanical seal device 5 can be self-centeringly clamped, and by controlling the mounting plate 27 to slide up and down, the two fixed plates 41 can be controlled to approach each other, so that the dynamic ring 511 and the static ring 521 of the mechanical seal device 5 can be pressed together, and by rotating the transmission rod 442, the dynamic ring 511 of the mechanical seal device 5 is driven to rotate relative to the static ring 521, thereby simulating the working state of the mechanical seal device 5 to perform an air tightness test on it, so that when the device performs an air tightness test on the mechanical seal device 5, dust between the dynamic ring 511 and the static ring 521 can be eliminated, which may cause unstable contact between the dynamic ring 511 and the static ring 521 when the dynamic ring 511 and the static ring 521 rotate relative to each other, thereby avoiding the unstable contact between the dynamic ring 511 and the static ring 521 when the dynamic ring 511 and the static ring 521 rotate relative to each other, resulting in misjudgment of poor sealing, thereby improving the detection accuracy of the device.

[0074] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A mechanical seal air tightness detection device, comprising a lower shell (11), an upper shell (21) and a mechanical seal device (5), wherein the mechanical seal device (5) comprises a coaxially arranged dynamic seal (51) and a static seal (52), a fixed plate (12) is fixedly installed inside the lower shell (11), and a mounting plate (27) is slidably installed on the top of the upper shell (21) in the up-down direction, characterized in that: It also includes a fixing clamping device (4); The fixing clamping device (4) comprises two fixing disks (41) and a locking assembly (44); the two fixing disks (41) are coaxial and respectively located above the fixing plate (12) and below the mounting disk (27); and the mechanical sealing device (5) is located between the two fixing disks (41); The locking assembly (44) comprises two threaded sleeves (441), a transmission rod (442), two adjusting nuts (443) and a clamping block (444). The two threaded sleeves (441) are respectively fixedly mounted on the fixing plate (12) and the mounting plate (27) and are coaxial with the fixing plate (41). The two transmission rods (442) are respectively threadedly sleeved in the two threaded sleeves (441). One end of the two transmission rods (442) passes through the fixing plate (12) and the mounting plate (27) respectively. The clamping block (444) has a plurality of adjusting nuts (443) and surrounds the fixing plate (12). Two connecting rods (445) are provided on the clamping block (444) at one end of the outer wall of the two transmission rods (442) close to each other, one end of the two connecting rods (445) is hinged to the clamping block (444), and the other end of the two connecting rods (445) is hinged to the threaded sleeve (441) and the outer wall of the transmission rod (442), and two adjusting nuts (443) are respectively fixedly mounted on the bottom of the fixing plate (12) and the top of the mounting plate (27), and the two adjusting nuts (443) are respectively threadedly sleeved on the two transmission rods (442); The fixed clamping device (4) further comprises a connecting shaft (45), the connecting shaft (45) being located between the two transmission rods (442) and being coaxial with the transmission rods (442), one end of the connecting shaft (45) being fixedly connected to the end of one of the transmission rods (442), and the other end of the connecting shaft (45) slidingly passing through the end of the other transmission rod (442); A mounting sleeve (121) is fixedly mounted on the top of the fixing plate (12), and an annular sleeve (271) is fixedly mounted on the bottom of the fixing plate (27) and slides through the top of the upper shell (21). The mounting sleeve (121) and the annular sleeve (271) are both coaxial with the fixing plate (41). A connecting sleeve (42) having one end fixedly connected to the fixing plate (41) is slidably sleeved inside the mounting sleeve (121) and the annular sleeve (271). Elastic members (43) are provided inside the two connecting sleeves (42). One end of the two elastic members (43) is respectively fixedly connected to the two fixing plates (41), and the other end of the two elastic members (43) is respectively fixedly connected to the fixing plate (12) and the fixing plate (27).

2. A mechanical seal airtightness detection device according to claim 1, characterized in that: A conical groove (411) is provided on one side opposite to the two fixed disks (41), a coaxial annular groove (412) is provided in the middle of the conical groove (411), a coaxial through hole (413) is provided in the middle of the annular groove (412), and the transmission rod (442) passes through the fixed disk (41) through the through hole (413) and extends into the inner cavity of the mechanical sealing device (5).

3. The mechanical seal airtightness detection device according to claim 1, characterized in that: A support ring (111) is fixedly mounted on the middle portion of the outer wall of the lower shell (11); the upper shell (21) is slidably sleeved on the lower shell (11) in the up-down direction; the bottom of the upper shell (21) contacts the support ring (111); and a driving component for driving the mounting plate (27) to move in the up-down direction is mounted on the upper shell (21).

4. The mechanical seal airtightness detection device according to claim 3, characterized in that: The driving assembly comprises a limit ring (22), an inner gear ring (23), a mounting ring (24), a screw (25) and a gear (26); the limit ring (22) is fixedly mounted on the top of the upper shell (21); the limit ring (22) is sleeved on the outer side of the mounting plate (27) and is coaxial therewith; the inner gear ring (23) is rotatably mounted on the inner wall of the limit ring (22) and is coaxial therewith; a push plate (231) is fixedly mounted on the top of the inner gear ring (23) and extends out of the limit ring (22); The mounting ring (24) is rotatably sleeved on the outer wall of the mounting plate (27); the axis of the screw rod (25) is parallel to the axis of the mounting ring (24) and is rotatably mounted on the top of the upper shell (21); the top of the screw rod (25) passes through the mounting ring (24); there are at least two screw rods (25) and they are evenly distributed along the circumferential direction of the mounting ring (24); the gear (26) is located at the bottom of the mounting ring (24) and is meshed with the inner gear ring (23); the gear (26) is fixedly sleeved on the outer wall of the screw rod (25).

5. The mechanical seal airtightness detection device according to claim 1, characterized in that: The lower shell (11) is provided with a locking device (3) for fixing the upper shell (21) to the lower shell (11). The locking device (3) comprises a fixing rod (31) and a fixing column (32) extending in the up-down direction. There are at least two fixing rods (31) and they are evenly distributed along the circumferential direction of the lower shell (11). A buckle (311) is provided on the top of the fixing rod (31) close to the upper shell (21). The buckle (311) contacts the top of the upper shell (21). The axis of the fixing column (32) is perpendicular to the axis of the lower shell (11). One end of the fixing column (32) slides through the fixing rod (31) and is fixedly connected to the outer wall of the lower shell (11). There are at least two fixing columns (32) on the same fixing rod (31).

6. The mechanical seal airtightness detection device according to claim 5, characterized in that: A limit plate (33) is fixedly mounted on one end of the fixing column (32) away from the lower housing (11); a locking spring (34) is mounted between the limit plate (33) and the fixing rod (31); the locking spring (34) is sleeved on the outer wall of the fixing column (32); and two ends of the locking spring (34) are respectively fixedly connected to the fixing rod (31) and the limit plate (33).

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