Sealing element testing device

Abstract

The invention provides a sealing element testing device, and belongs to the technical field of testing devices. The problem that an existing testing device is low in detection precision is solved. The sealing element testing device comprises a motor, a pair of sealing seats, a circular-ring-shaped testing cylinder detachably and fixedly connected to one end of the motor and a shaft sleeve detachably and fixedly connected to an output shaft of the motor in a sleeving mode, the inner side wall of the testing cylinder is provided with a testing seat which is annularly and inwards arranged in a protruding mode, and the output shaft of the motor penetrates through the testing seat. The pair of sealing seats are detachably and fixedly connected to the two sides of the testing seat respectively, a medium cavity with an inlet and an outlet is formed among the pair of sealing seats, the shaft sleeve and the testing seat, an installation space for installing a sealing element to be tested is formed between the sealing seats and the shaft sleeve, the installation space is communicated with the medium cavity, and a heat exchange channel surrounding the medium cavity is formed in the testing seat. The sealing element testing device has the advantages that the testing device can simulate different working condition environments to test the sealing element, and the detection precision of the sealing element is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of testing devices and relates to a sealing element testing device. Background Art

[0002] Sealing elements play an important sealing role in various mechanical equipment. The quality of their sealing performance directly affects the safety and reliability of the equipment. In order to accurately judge whether the sealing of the sealing element is reliable, it is necessary to check the sealing performance of the sealing element.

[0003] Existing sealing element detection devices. For example, a Chinese patent document discloses an experimental device for detecting the sealing performance of lip seals [Patent No.: 201610727648.8; Publication No.: CN106226059B]. It includes a driving mechanism. The driving mechanism includes a track platform. A first steel plate, a second steel plate and a third steel plate are movably connected on the track platform. An L-shaped plate is bolted to the second steel plate, and a motor is arranged on the L-shaped plate. The output end of the motor is provided with a test shaft. The test shaft passes through the third steel plate. A detection component is arranged on the third steel plate. The detection component includes a long disc and a short disc. The two discs are sleeved on the test shaft. A detachable cavity is arranged on one side of the short disc. Lip seals are arranged at the positions of the gaps between the test shaft and the long disc and the short disc. The lip seals are in interference fit with the test shaft. A stepped annular convex block is arranged at the end of the test shaft. A stepped annular groove is arranged in the short disc. And the gap between the stepped annular groove and the stepped annular convex block forms a plurality of annular placement grooves.

[0004] For the experimental device with this kind of structure, gas is injected through the air inlet hole, and the air pressure in the space between the two lip seals is detected by a pressure sensor, so as to detect the sealing performance of the lip seals. However, for the experimental device with this kind of structure, the lip seals and the test shaft are in dry friction when rotating, and can only be tested at one temperature, which deviates from the actual diverse working conditions of the seals, and there are great limitations in detection, reducing the detection accuracy of the experimental device. Summary of the Invention

[0005] The object of the present invention is to address the above problems existing in the prior art and propose a sealing element testing device. The technical problem to be solved is how to enable the present testing device to simulate different working conditions to test the sealing element and improve the detection accuracy of the sealing element.

[0006] The object of the present invention can be achieved by the following technical solutions: A seal testing device includes a motor. It is characterized in that it further includes a pair of seal seats, a testing cylinder which is circular ring-shaped and detachably connected to one end of the motor, and a sleeve detachably sleeved and connected to the output shaft of the motor. The inner side wall of the testing cylinder has a testing seat protruding inward in a circular shape. The output shaft of the motor passes through the testing seat. The pair of seal seats are respectively detachably connected to both sides of the testing seat. A medium cavity with an inlet and an outlet is formed among the pair of seal seats, the sleeve and the testing seat. An installation space for installing the seal to be tested is formed between the seal seat and the sleeve. The installation space is communicated with the medium cavity. The testing seat has a heat exchange channel arranged around the medium cavity.

[0007] Lubricating oil can be introduced into the medium cavity to lubricate the seal, making the detection environment of the seal more in line with the actual working condition environment. The rotational speed of the output shaft of the motor can be controlled, so as to detect the service life of the seal at different rotational speeds of the output shaft under normal conditions. Other different chemical media can also be introduced into the medium cavity to bring different chemical media into contact with the seal, and test the applicability and durability of the seal in a specific medium environment. Refrigerant or heat medium can flow into the heat exchange channel. The heat exchange channel plays a role in heat exchange, enabling the seal to be detected at different temperatures. The heat exchange channel is arranged around the medium cavity, making the medium in the seal seat and the medium cavity receive heat evenly and exchange heat evenly, so that the seal receives heat evenly, avoiding uneven heating and improving the detection accuracy of the seal. The rotational speed of the output shaft of the motor, the temperature when the seal works, and the medium in contact with the seal of this testing device can all be controlled, enabling this testing device to simulate different working condition environments, test various performances of the seal, and improve the detection accuracy of the seal. Both the seal seat and the sleeve are detachable, that is, by replacing different seal seats and sleeves, it can be matched to be applicable to seals of different specifications, detect different seals, and improve the versatility of this testing device.

[0008] In the above-mentioned seal testing device, the testing device further includes a gland. The gland is detachably and hermetically connected to the outer end of the testing cylinder. An observation cavity is formed between the gland and the testing cylinder. The observation cavity is used to externally connect to a vacuum pump. After the seal to be tested is installed in the installation space, the observation cavity and the medium cavity are not communicated with each other. By pumping vacuum with the vacuum pump, the pressure in the observation cavity can be controlled, so as to detect the sealing performance of the seal under the action of different pressures on both sides, increase the pressure parameter, and thus can simulate a more real working condition environment to detect the seal, improving the detection accuracy of the seal.

[0009] In the above-mentioned seal testing device, the gland has an observation port, and the observation port is sealed and blocked by an observation glass. The situation inside the observation chamber can be viewed through the observation glass and the observation port to check whether the medium leaks from the seal and to determine whether the seal fails.

[0010] In the above-mentioned seal testing device, the outer ends of the output shaft of the motor and the outer end of the shaft sleeve both pass through the seal seat and extend into the observation chamber. This structure makes it convenient to disassemble and assemble the shaft sleeve and the seal seat. At the same time, it improves the stability of the seal after installation and the detection accuracy of the seal.

[0011] In the above-mentioned seal testing device, the output shaft of the motor has an annular step surface. One end of the shaft sleeve abuts against the step surface, and the other end is blocked by a pressing plate and axially locked along the axial direction of the output shaft of the motor by a fastener to axially position the shaft sleeve. The other end of the shaft sleeve is radially inserted through the shaft sleeve and the output shaft of the motor by a pin shaft to circumferentially position the shaft sleeve. This structure makes it convenient to disassemble and assemble the shaft sleeve, and the shaft sleeve rotates with the output shaft of the motor. A sealing ring is provided between the shaft sleeve and the step surface to ensure that the air pressure in the observation chamber does not leak.

[0012] In the above-mentioned seal testing device, the testing device further includes an M-shaped support frame and a long strip-shaped slide rail. A slider is slidably connected to the slide rail, and the support frame is fixedly connected to the slider. The bottom of the testing cylinder is embedded and placed on the support frame. When the inner end of the testing cylinder is fixedly connected to the motor, one end of the slide rail extends outside the outer end of the testing cylinder. This testing device can detect two seals at a time, improving the testing efficiency. When disassembling the seal, first remove the testing cylinder from the motor, and then move the support frame along the slide rail outwards for a certain distance, so that there is enough space to disassemble and assemble the seal at the inner end. This makes it convenient to disassemble and assemble the seal. And when installing, only need to push the support frame, then the testing cylinder can be located at the installation position, making it convenient and labor-saving to disassemble and assemble the testing cylinder and the motor, thus improving the detection efficiency; at the same time, the support frame is M-shaped and is adapted to the shape of the testing cylinder. The support frame plays a role in supporting the testing cylinder, reducing the radial force between the testing cylinder and the motor, reducing the vibration of the testing cylinder, improving the stability of this testing device, and thus improving the testing accuracy of the seal.

[0013] In the above-mentioned seal testing device, the motor includes a mounting plate, and the testing cylinder is detachably fixedly connected to the mounting plate. The mounting plate serves as an intermediate mounting carrier, enabling the testing cylinder to be better fixedly connected to the motor, improving the mounting stability of the testing cylinder, and thus improving the testing accuracy of the seal.

[0014] In the above-mentioned seal testing device, an avoidance groove recessed inward in a circular shape is provided at the middle of the circumferential outer side of the testing cylinder. The inlet and outlet of the medium in the medium cavity are located in the avoidance groove, and the inlet and outlet of the medium in the heat exchange channel are located in the avoidance groove. The provision of the avoidance groove enables the joint to be located in the avoidance groove without being exposed, facilitating the installation and transportation of the testing cylinder.

[0015] In the above-mentioned seal testing device, the central axis of the output shaft of the motor coincides with the central axis of the testing seat.

[0016] In the above-mentioned seal testing device, the seal seat is a static ring seat or an oil seal seat. When it is a static ring seat, it can be used to test mechanical seals, and when it is an oil seal seat, it can be used to test lip seals.

[0017] Compared with the prior art, a seal testing device provided by the present invention has the following advantages:

[0018] 1. The rotation speed of the output shaft of the motor of this testing device, the temperature during the operation of the seal, the medium in contact with the seal, and the air pressure on both sides of the seal can all be controlled, enabling this testing device to simulate different working conditions and test various performances of the seal, thereby improving the detection accuracy of the seal.

[0019] 2. This testing device supports the testing cylinder through an M-shaped support frame, improving the stability of the testing cylinder and the detection accuracy of the seal; at the same time, in cooperation with the slide rail, the movement of the testing cylinder is convenient and labor-saving, facilitating the disassembly and assembly of the seal located at the inner end of the testing cylinder and improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of this testing device.

[0021] Figure 2 It is a schematic diagram of the overall structure of the motor, testing cylinder and support frame of this testing device.

[0022] Figure 3 It is an axial sectional view and a partial enlarged view of this testing device.

[0023] Figure 4 It is a radial sectional view of the testing cylinder of this testing device.

[0024] Figure 5 It is a schematic diagram of the overall structure of the support frame of this testing device.

[0025] In the figure, 1 is a motor; 1a is an output shaft; 1a1 is a stepped surface; 2 is a seal seat; 3 is a test cylinder; 31 is a test seat; 32 is a heat exchange channel; 33 is an avoidance groove; 4 is a bushing; 5 is a medium cavity; 6 is an installation space; 7 is a gland; 71 is an observation port; 8 is an observation cavity; 9 is a vacuum pump; 10 is an observation glass; 11 is a fastener; 12 is a pin shaft; 13 is a support frame; 14 is a slide rail; 15 is a slider; 16 is a mounting plate; 17 is a seal; 18 is a pressing plate. Detailed implementation manners

[0026] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0027] As Figure 1 , Figure 2 , Figure 3 shown, this seal testing device includes a motor 1, a seal seat 2, a test cylinder 3, a bushing 4, a gland 7, a vacuum pump 9, a support frame 13, a slide rail 14, a slider 15 and a mounting plate 16. In this embodiment, the seal seat 2 is an oil seal seat for installing a lip seal. In actual production, the seal seat 2 can be a stationary ring seat for installing a mechanical seal.

[0028] The motor 1 includes a mounting plate 16, and the test cylinder 3 is detachably fixedly connected to the mounting plate 16. The test cylinder 3 is annular, and on the inner side wall of the test cylinder 3, there is a test seat 31 protruding inward in an annular shape. The output shaft 1a of the motor 1 passes through the test seat 31, and the central axis of the output shaft 1a of the motor 1 coincides with the central axis of the test seat 31. A bushing 4 is detachably sleeved on the output shaft 1a of the motor 1. Specifically, on the output shaft 1a of the motor 1, there is an annular stepped surface 1a1. One end of the bushing 4 abuts against the stepped surface 1a1, and the other end is blocked by a pressing plate 18 and axially locked by a fastener 11 such as a bolt along the axial direction of the output shaft 1a of the motor 1 to axially position the bushing 4. The other end of the bushing 4 is circumferentially positioned by a pin shaft 12 passing through the bushing 4 and the output shaft 1a of the motor 1 in the radial direction of the output shaft 1a of the motor 1.

[0029] A pair of seal seats 2 are respectively detachably fixedly connected to both sides of the test seat 31. A medium cavity 5 with an inlet and an outlet is formed between the pair of seal seats 2, the bushing 4 and the test seat 31. An installation space 6 for installing the seal 17 to be tested is formed between the seal seat 2 and the bushing 4, and the installation space 6 is communicated with the medium cavity 5. As Figure 4 shown, in the test seat 31, there is a heat exchange channel 32 surrounding the medium cavity 5. In the middle of the circumferential outer side of the test cylinder 3, there is an avoidance groove 33 recessed inward in an annular shape. The inlet and outlet of the medium in the medium cavity 5 are located in the avoidance groove 33, and the inlet and outlet of the medium in the heat exchange channel 32 are located in the avoidance groove 33.

[0030] The gland 7 is detachably and hermetically connected to the outer end of the test cylinder 3. An observation chamber 8 is formed between the gland 7 and the test cylinder 3. The observation chamber 8 is used to externally connect to a vacuum pump 9. After the seal to be tested is installed in the installation space, the observation chamber and the medium chamber are not connected to each other. The gland 7 has an observation port 71, and the observation port 71 is hermetically blocked by an observation glass 10. The outer ends of the output shaft 1a of the motor 1 and the outer end of the bushing 4 both pass through the seal seat 2 and extend into the observation chamber 8.

[0031] As Figure 5 shown, the support frame 13 is in an M shape, the slide rail 14 is in a long strip shape, a slider 15 is slidably connected to the slide rail 14, the support frame 13 is fixedly connected to the slider 15, and the bottom of the test cylinder 3 is embedded and placed on the support frame 13. When the inner end of the test cylinder 3 is fixedly connected to the motor 1, one end of the slide rail 14 extends out of the outer end of the test cylinder 3.

[0032] During installation, install the seal 17 to be tested on the seal seat 2, fixedly connect the seal seat 2 to both sides of the test seat 31, sleeved and fixed the matching bushing 4 on the output shaft 1a of the motor 1, then move the support frame 13 along the slide rail 14 so that the bushing 4 passes through the seal 17 and the test seat 31, the outer end of the bushing 4 extends into the observation chamber 8, the test cylinder 3 abuts against the mounting plate 16, and is locked by bolts, and then install the gland 7. During testing, according to the set parameters, control the temperature and flow rate of the refrigerant and the heat medium in the heat exchange channel 32, so as to control the temperature of the seal 17, introduce different media into the medium chamber 5 for detection, evacuate the observation chamber 8, control the pressure on both sides of the seal 17, and observe the failure time of the seal 17. After the test is completed, remove the test cylinder 3 from the mounting plate 16, push the support frame 13 to move along the slide rail 14 so that the bushing 4 leaves the test cylinder 3, and then the seal seat 2, the seal 17 and the bushing 4 can be removed to complete one detection. Repeat the above steps to complete the detection of multiple different seals 17.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0034] Although terms such as motor 1, output shaft 1a, stepped surface 1a1, seal seat 2, test cylinder 3, test seat 31, heat exchange channel 32, relief groove 33, bushing 4, medium chamber 5, installation space 6, gland 7, observation port 71, observation chamber 8, vacuum pump 9, observation glass 10, fastener 11, pin shaft 12, support frame 13, slide rail 14, slider 15, mounting plate 16, seal 17, pressing plate 18, etc. are used more frequently in this text, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A seal testing device, comprising a motor (1), characterized in that: The motor (1) further comprises a pair of sealing seats (2), a test cylinder (3) in an annular shape and detachably fixed to one end of the motor (1), and a sleeve (4) detachably sleeved and fixed to the output shaft (1a) of the motor (1); the inner side wall of the test cylinder (3) comprises a test seat (31) in an annular shape and protruding inwardly; the output shaft (1a) of the motor (1) passes through the test seat (31); the pair of sealing seats (2) are detachably fixed to the two sides of the test seat (31); a medium cavity (5) having an inlet and outlet is formed between the pair of sealing seats (2), the sleeve (4) and the test seat (31); an installation space (6) for installing a seal (17) to be tested is formed between the sealing seat (2) and the sleeve (4); the installation space (6) is communicated with the medium cavity (5); and the test seat (31) comprises a heat exchange channel (32) arranged around the medium cavity (5).

2. A seal testing device according to claim 1, characterized in that: The testing device further comprises a gland (7), wherein the gland (7) is detachably and sealingly fixedly connected to the outer end of the testing cylinder (3), and an observation chamber (8) is formed between the gland (7) and the testing cylinder (3), and the observation chamber (8) is used for connecting to an external vacuum pump (9).

3. A seal testing device according to claim 2, characterized in that: The pressure cover (7) is provided with an observation port (71), and the observation port (71) is sealed and blocked by an observation glass (10).

4. A seal testing device according to claim 2, characterized in that: The outer end of the output shaft (1a) of the motor (1) and the outer end of the shaft sleeve (4) both pass through the sealing seat (2) and extend into the observation chamber (8).

5. A seal testing device according to claim 1 or 2 or 3 or 4, characterized in that: The output shaft (1a) of the motor (1) has an annular step surface (1a1); one end of the shaft sleeve (4) abuts against the step surface (1a1), and the other end is blocked by a pressure plate (18) and locked along the axial direction of the output shaft (1a) of the motor (1) by a fastener (11) so that the shaft sleeve (4) is axially positioned; the other end of the shaft sleeve (4) is inserted through a pin (12) along the radial direction of the output shaft (1a) of the motor (1) and the output shaft (1a) of the motor (1) so that the shaft sleeve (4) is circumferentially positioned.

6. A seal testing device according to claim 1 or 2 or 3 or 4, characterized in that: The testing device further comprises an M-shaped support frame (13) and a long strip-shaped slide rail (14); a slider (15) is slidably connected to the slide rail (14); the support frame (13) is fixedly connected to the slider (15); the bottom of the testing cylinder (3) is embedded and placed on the support frame (13); when the inner end of the testing cylinder (3) is fixedly connected to the motor (1), one end of the slide rail (14) extends out of the outer end of the testing cylinder (3).

7. A seal testing device according to claim 1 or 2 or 3 or 4, characterized in that: The motor comprises a mounting plate (16), and the testing cylinder (3) is detachably fixedly connected to the mounting plate (16).

8. A seal testing device according to claim 1, 2, 3 or 4, characterized in that: The test cylinder (3) has an avoidance groove (33) inwardly arranged in an annular concave shape at the middle of the circumferential outer side, the inlet and outlet of the medium of the medium cavity (5) are located in the avoidance groove (33), and the inlet and outlet of the medium of the heat exchange channel (32) are located in the avoidance groove (33).

9. A seal testing device according to claim 1 or 2 or 3 or 4, characterized in that: The central axis of the output shaft (1a) of the motor (1) overlaps with the central axis of the test seat (31).

10. A seal testing device according to claim 1 or 2 or 3 or 4, characterized in that: The sealing seat (2) is a stationary ring seat or an oil seal seat.

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