A seal testing device

Abstract

The application provides a sealing test device, belonging to the technical field of test devices. The sealing test device comprises a motor, a pair of sealing seats, a test cylinder which is annular and detachably fixed to one end of the motor, and a shaft sleeve which is detachably sleeved and fixed to an output shaft of the motor. The inner side wall of the test cylinder is provided with a test seat which is annular and protrudes inward. The output shaft of the motor penetrates through the test seat. The pair of sealing seats are detachably fixed to the two sides of the test seat. A medium cavity with an inlet and an outlet is formed between the pair of sealing seats, the shaft sleeve and the test seat. An installation space for installing a sealing piece to be tested is formed between the sealing seat and the shaft sleeve. The installation space is in communication with the medium cavity. The test seat is provided with a heat exchange channel which surrounds the medium cavity. The sealing test device has the advantages that the sealing test device can simulate different working conditions to test the sealing piece, and the detection precision of the sealing piece is improved.

Description

Technical Field

[0001] This invention belongs to the field of testing device technology and relates to a sealing component testing device. Background Technology

[0002] Seals play an important role in sealing various mechanical equipment, and their sealing performance directly affects the safety and reliability of the equipment. In order to accurately determine whether the seal is reliable, it is necessary to check the sealing performance of the seal.

[0003] Existing sealing component testing devices, such as the experimental device disclosed in Chinese patent literature for testing the sealing performance of lip seals [Patent No.: 201610727648.8; Application Publication No.: CN106226059B], include a drive mechanism. The drive mechanism includes a track platform, on which a first steel plate, a second steel plate, and a third steel plate are movably connected. An L-shaped plate is bolted to the second steel plate, and a motor is mounted on the L-shaped plate. A test shaft is mounted at the output end of the motor. The shaft passes through a third steel plate, on which a detection assembly is mounted. The detection assembly includes a long disc and a short disc, both of which are fitted onto the test shaft. A detachable cavity is provided on one side of the short disc. A lip seal is provided at the gap between the test shaft and the long and short discs. The lip seal is interference-fitted with the test shaft. A stepped annular protrusion is provided at the end of the test shaft. A stepped annular groove is provided inside the short disc. The gaps between the stepped annular groove and the stepped annular protrusion form multiple annular placement slots.

[0004] This type of experimental setup injects gas through an air inlet and uses a pressure sensor to detect the air pressure in the space between the two lip seals, thereby testing the sealing performance of the lip seals. However, this setup involves dry friction between the lip seals and the test shaft during rotation and can only be tested at a single temperature, which deviates from the diverse actual operating conditions of the seals. This significantly limits the testing accuracy and reduces the overall testing precision of the setup. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a sealing component testing device. The technical problem solved is how to enable this testing device to simulate different working conditions to test sealing components, thereby improving the detection accuracy of sealing components.

[0006] The objective of this invention can be achieved through the following technical solution: A sealing component testing device, comprising a motor, characterized in that it further comprises a pair of sealing seats, a test cylinder that is annular and detachably fixed to one end of the motor, and a bushing that is detachably sleeved and fixed to the output shaft of the motor. The inner sidewall of the test cylinder has a test seat that is annularly protruding inward. The output shaft of the motor passes through the test seat. The pair of sealing seats are detachably fixed to both sides of the test seat. A medium cavity with an inlet and outlet is formed between the pair of sealing seats, the bushing, and the test seat. An installation space for installing the sealing component to be tested is formed between the sealing seats and the bushing. The installation space is connected to the medium cavity. The test seat has a heat exchange channel arranged around the medium cavity.

[0007] Lubricating oil can be introduced into the medium chamber to lubricate the seals, making the testing environment more closely resemble actual working conditions. The rotation speed of the motor output shaft can be controlled, allowing the testing of the seal's service life under normal conditions at different shaft speeds. Different chemical media can also be introduced into the medium chamber to allow them to contact the seals and test their suitability and durability in specific media environments. Refrigerant or heat exchanger can flow into the heat exchange channel, which facilitates heat exchange and allows the seals to be tested at different temperatures. The heat exchange channel surrounds the medium chamber, ensuring uniform heating of the seal seat and the medium within the chamber, thus preventing uneven heating and improving the testing accuracy. The motor output shaft speed, the seal's operating temperature, and the medium in contact with the seal are all controllable in this testing device, enabling it to simulate various working conditions and test various seal performance parameters, thereby improving the testing accuracy. Both the sealing seat and the bushing are detachable, meaning that by replacing different sealing seats and bushings, it can be used to test different specifications of seals, thereby improving the versatility of this testing device.

[0008] In the aforementioned sealing component testing device, the testing device further includes a pressure cap, which is detachably and sealingly fixed to the outer end of the test cylinder. An observation chamber is formed between the pressure cap and the test cylinder, and this observation chamber is used to connect to an external vacuum pump. After the sealing component to be tested is installed in the mounting space, the observation chamber and the medium chamber are not interconnected. By evacuating the chamber with the vacuum pump, the pressure inside the observation chamber can be controlled, thereby allowing the sealing performance of the sealing component to be detected under different pressures on both sides. Increasing the pressure parameter allows for simulating a more realistic working environment for testing the sealing component, thus improving the testing accuracy.

[0009] In the aforementioned sealing component testing device, the gland has an observation port, which is sealed and plugged by an observation glass. The condition inside the observation chamber can be observed through the observation glass and the observation port to see if the medium is leaking from the sealing component and to determine if the sealing component has failed.

[0010] In the aforementioned sealing component testing device, the outer end of the motor output shaft and the outer end of the bushing both extend through the sealing seat into the observation cavity. This structure facilitates the assembly and disassembly of the bushing and sealing seat, while also improving the stability of the sealing component after installation and enhancing the testing accuracy of the sealing component.

[0011] In the aforementioned sealing component testing device, the output shaft of the motor has an annular stepped surface. One end of the bushing abuts against the stepped surface, and the other end is blocked by a pressure plate and locked axially along the output shaft of the motor by fasteners to position the bushing axially. The other end of the bushing is circumferentially positioned by a pin passing radially through the bushing and the motor output shaft. This structure facilitates the assembly and disassembly of the bushing and allows it to rotate with the motor output shaft. A sealing ring is provided between the bushing and the stepped surface to ensure that the air pressure in the observation chamber does not leak out.

[0012] In the aforementioned sealing component testing device, the testing device further includes an M-shaped support frame and a long, narrow 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 test cylinder is embedded in the support frame. When the inner end of the test cylinder is fixedly connected to the motor, one end of the slide rail extends beyond the outer end of the test cylinder. This testing device can test two seals at once, improving testing efficiency. When disassembling a seal, the test cylinder is first removed from the motor, and then moved outward along the slide rail by the support frame, providing sufficient space for disassembly and assembly of the inner seal. This makes disassembly and assembly of the seal convenient. During installation, simply pushing the support frame positions the test cylinder in the installation position, making disassembly and assembly of the test cylinder and motor convenient and labor-saving, thereby improving testing efficiency. Simultaneously, the M-shaped support frame matches the shape of the test cylinder, supporting the test cylinder, reducing the radial force between the test cylinder and the motor, reducing vibration of the test cylinder, improving the stability of the testing device, and thus improving the testing accuracy of the seal.

[0013] In the aforementioned sealing component testing device, the motor includes a mounting plate, and the test cylinder is detachably and fixedly connected to the mounting plate. The mounting plate serves as an intermediate mounting carrier, allowing the test cylinder to be better fixedly connected to the motor, improving the installation stability of the test cylinder, and thus enhancing the testing accuracy of the sealing component.

[0014] In the aforementioned sealing component testing device, the test cylinder has an inwardly recessed annular relief groove at the center of its outer circumference. The inlet and outlet of the medium in the medium cavity and the inlet and outlet of the heat exchange channel are both located within the relief groove. The relief groove ensures that the connectors are not exposed, facilitating the installation and transportation of the test cylinder.

[0015] In the aforementioned sealing component testing device, the central axis of the motor's output shaft overlaps with the central axis of the test base.

[0016] In the aforementioned sealing component testing device, the sealing seat is either a stationary ring seat or an oil seal seat. When it is a stationary ring seat, it can be used to test mechanical seals; when it is an oil seal seat, it can be used to test lip seals.

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

[0018] 1. The speed of the motor output shaft, the temperature of the seal during operation, the medium in contact with the seal, and the air pressure on both sides of the seal are all controllable in this testing device. This allows the testing device to simulate different working conditions and test various properties of the seal, thereby improving the accuracy of seal testing.

[0019] 2. This testing device uses an M-shaped support frame to support the test cylinder, improving the stability of the test cylinder and the detection accuracy of the seals; at the same time, the slide rail makes the test cylinder easy to move and saves effort, and makes it easy to disassemble and assemble the seals located at the inner end of the test cylinder, thus improving the detection efficiency. Attached Figure Description

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

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

[0022] Figure 3 This is an axial sectional view and a magnified view of a portion of the structure of this testing device.

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

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

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

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figure 1 , Figure 2 , Figure 3 As shown, this sealing component testing device includes a motor 1, a sealing 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 sealing seat 2 is an oil seal seat used to install a lip seal ring. In actual production, the sealing seat 2 can be a stationary ring seat used to install a mechanical seal.

[0028] The motor 1 includes a mounting plate 16, and the test cylinder 3 is detachably fixed to the mounting plate 16. The test cylinder 3 is annular, and the inner wall of the test cylinder 3 has a test seat 31 that protrudes 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 overlaps with the central axis of the test seat 31. A bushing 4 is detachably fitted on the output shaft 1a of the motor 1. Specifically, the output shaft 1a of the motor 1 has 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 pressure plate 18 and locked axially along the output shaft 1a by fasteners 11 such as bolts to position the bushing 4 axially. The other end of the bushing 4 is circumferentially positioned by a pin 12 that passes radially along the output shaft 1a of the motor 1.

[0029] A pair of sealing seats 2 are detachably fixed to both sides of the test seat 31. A medium cavity 5 with inlet and outlet is formed between the pair of sealing seats 2, the bushing 4, and the test seat 31. An installation space 6 for installing the seal to be tested 17 is formed between the sealing seats 2 and the bushing 4. The installation space 6 is connected to the medium cavity 5. Figure 4 As shown, the test holder 31 has a heat exchange channel 32 surrounding the medium cavity 5, and the test cylinder 3 has an inwardly recessed relief groove 33 at the middle of the outer side. The inlet and outlet of the medium in the medium cavity 5 are located in the relief groove 33, and the inlet and outlet of the medium in the heat exchange channel 32 are located in the relief groove 33.

[0030] The gland 7 is detachably and sealingly fixed to the outer end of the test cylinder 3, forming an observation chamber 8 between the gland 7 and the test cylinder 3. The observation chamber 8 is used for external connection to the vacuum pump 9. When the seal to be tested is installed in the installation space, the observation chamber and the medium chamber are not connected. The gland 7 has an observation port 71, which is sealed and plugged by the observation glass 10. The outer end of the output shaft 1a of the motor 1 and the outer end of the bushing 4 both extend into the observation chamber 8 through the sealing seat 2.

[0031] like Figure 5 As shown, the support frame 13 is M-shaped, the slide rail 14 is long and narrow, and the slider 15 is slidably connected to the slide rail 14. The support frame 13 is fixed to the slider 15. The bottom of the test cylinder 3 is embedded in the support frame 13. When the inner end of the test cylinder 3 is fixed to the motor 1, one end of the slide rail 14 extends out to the outer end of the test cylinder 3.

[0032] During installation, the seal to be tested 17 is installed on the sealing seat 2, and the sealing seat 2 is fixed to both sides of the test seat 31. The matching bushing 4 is fitted and fixed on the output shaft 1a of the motor 1. Then, the support frame 13 is moved along the slide rail 14, so that the bushing 4 passes through the seal 17 and the test seat 31, and the outer end of the bushing 4 extends into the observation chamber 8. The test cylinder 3 is placed against the mounting plate 16 and locked with bolts. Then, the pressure cap 7 is installed. During testing, the temperature and flow rate of the refrigerant and heat medium in the heat exchange channel 32 are controlled according to the set parameters, thereby controlling the temperature of the seal 17. Different media are introduced into the medium chamber 5 for testing. The observation chamber 8 is evacuated, the pressure on both sides of the seal 17 is controlled, and the failure time of the seal 17 is observed. After the test is completed, the test cylinder 3 is removed from the mounting plate 16, the support frame 13 is pushed along the slide rail 14, so that the bushing 4 leaves the test cylinder 3. Then, the sealing seat 2, the seal 17, and the bushing 4 can be removed to complete one test. By repeating the above steps, the testing of multiple different seals 17 can be completed.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0034] Although this document frequently uses terms such as motor 1, output shaft 1a, stepped surface 1a1, sealing seat 2, test cylinder 3, test base 31, heat exchange channel 32, clearance groove 33, bushing 4, medium cavity 5, installation space 6, pressure cap 7, observation port 71, observation cavity 8, vacuum pump 9, observation glass 10, fastener 11, pin 12, support frame 13, slide rail 14, slider 15, mounting plate 16, seal 17, and pressure plate, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A sealing component testing device, comprising a motor (1), characterized in that, It also includes a pair of sealing seats (2), a test cylinder (3) that is annular and detachably fixed to one end of the motor (1), and a bushing (4) that is detachably sleeved and fixed to the output shaft (1a) of the motor (1). The inner wall of the test cylinder (3) has a test seat (31) that is annularly protruding inward. The output shaft (1a) of the motor (1) passes through the test seat (31). The pair of sealing seats (2) are detachably fixed to both sides of the test seat (31). The pair of sealing seats (2) and the bushing (4) A medium cavity (5) with inlet and outlet is formed between the sealing seat (2) and the test base (31). An installation space (6) for installing the seal to be tested (17) is formed between the sealing seat (2) and the bushing (4). The installation space (6) is connected to the medium cavity (5). The test base (31) has a heat exchange channel (32) arranged around the medium cavity (5). The test device also includes a pressure cap (7). The pressure cap (7) is detachably and sealed to the outer end of the test cylinder (3). The pressure cap (7) and the test cylinder (3) are connected to each other. An observation cavity (8) is formed between the two sides. The observation cavity (8) is used to connect to an external vacuum pump (9). The outer end of the output shaft (1a) of the motor (1) and the outer end of the bushing (4) both extend into the observation cavity (8) through the sealing seat (2). The output shaft (1a) of the motor (1) has an annular stepped surface (1a1). One end of the bushing (4) abuts against the stepped surface (1a1), and the other end is blocked by the pressure plate (18) and locked along the axial direction of the output shaft (1a) of the motor (1) by the fastener (11). The bushing (4) is axially positioned. The other end of the bushing (4) is inserted radially along the output shaft (1a) of the motor (1) by a pin (12) in the bushing (4) and the output shaft (1a) of the motor (1) to position the bushing (4) circumferentially. The test cylinder (3) has an inwardly recessed annular relief groove (33) at the middle of its circumferential outer side. The inlet and outlet of the medium in the medium cavity (5) are located in the relief groove (33), and the inlet and outlet of the medium in the heat exchange channel (32) are located in the relief groove (33).

2. The sealing component testing device according to claim 1, characterized in that, The pressure cap (7) has an observation port (71), which is sealed and blocked by the observation glass (10).

3. A sealing component testing device according to claim 1 or 2, characterized in that, The testing device also includes an M-shaped support frame (13) and a long slide rail (14). A slider (15) is slidably connected to the slide rail (14). The support frame (13) is fixed to the slider (15). The bottom of the test cylinder (3) is embedded in the support frame (13). When the inner end of the test cylinder (3) is fixed to the motor (1), one end of the slide rail (14) extends to the outer end of the test cylinder (3).

4. A sealing component testing device according to claim 1 or 2, characterized in that, The motor includes a mounting plate (16), and the test cylinder (3) is detachably fixed to the mounting plate (16).

5. A sealing component testing device according to claim 1 or 2, 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).

6. A sealing component testing device according to claim 1 or 2, characterized in that, The sealing seat (2) is either a stationary ring seat or an oil seal seat.

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