Lip-shaped sealing ring performance testing device

Abstract

The utility model relates to the field of sealing ring performance testing, in particular to a lip-shaped sealing ring performance testing device which comprises an oil tank, the oil tank comprises an oil cavity outer shell and an oil cavity inner shell, the inner diameter of the oil cavity outer shell is larger than the outer diameter of the oil cavity inner shell, and a testing gap used for sleeving a lip-shaped sealing ring is reserved between the oil cavity outer shell and the oil cavity inner shell. A limiting plate used for limiting the lip-shaped sealing ring is detachably arranged on the oil cavity outer shell, an oil guide hole is formed in the limiting plate, a transmission shaft is detachably connected to the oil cavity inner shell, a torque sensor is arranged on the oil cavity outer shell and communicated with a pressure inlet pipeline, and a pressure sensor, a strain gauge and a temperature measuring element are arranged on the oil tank. By implementing the scheme, the problem that only a single test can be performed on the lip-shaped sealing ring in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the field of sealing ring performance testing, in particular to a lip sealing ring performance testing device. Background Art

[0002] Lip seals are commonly used in hydraulic and pneumatic transmissions. The interference fit between the seal lip and the mating surface, combined with the pressure of the working medium, causes the seal to deform elastomerically, thereby sealing the gap between the two relatively moving parts. This seal prevents fluid or gas leakage, thus enabling the normal operation of the system. With the development of modern industry, the operating conditions of mechanical equipment are becoming increasingly demanding, placing increasing demands on the performance of lip seals. Once the seal fails, excessive leakage of internal fluid will cause immeasurable damage to the equipment. Therefore, both manufacturers of lip seals need to test their various performance characteristics (such as pumping capacity, deformation, friction torque, etc.), and manufacturers who use lip seals for assembly must also test their performance before purchase or assembly.

[0003] At present, the performance test of lip seals is relatively simple. Most of them are to build test benches and focus on the research of one performance indicator, such as a single test study on the sealing or wear resistance of the lip seal. For example, a metal skeleton rotating shaft lip seal performance test and evaluation device with announcement number CN116429334B only tests the sealing; the rotating shaft lip seal friction torque test device with announcement number CN202049005U only tests the friction torque. At present, no device has been found that can perform multiple performance tests on lip seals. Utility Model Content

[0004] The utility model aims to provide a lip seal ring performance test device to solve the problem in the prior art that only a single test can be performed on the lip seal ring.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a lip seal ring performance test device, comprising an oil tank, wherein the oil tank comprises an oil chamber outer shell and an oil chamber inner shell, the inner diameter of the oil chamber outer shell is larger than the outer diameter of the oil chamber inner shell, and a test gap for fitting the lip seal ring is left between the oil chamber outer shell and the oil chamber inner shell, a limit plate for limiting the lip seal ring is detachably provided on the oil chamber outer shell, an oil guide hole is opened on the limit plate, a transmission shaft for driving the oil chamber inner shell to rotate is detachably connected to the oil chamber inner shell, a pressure inlet pipe is connected to the oil chamber outer shell, and a torque sensor, a pressure sensor, a strain gauge and a temperature measuring element are provided on the oil tank.

[0006] Preferably, as an improvement, a guide groove for installing a lip seal ring is provided at the end of the oil chamber housing.

[0007] Preferably, as an improvement, the transmission shaft is connected to a transmission motor via a coupling, and the transmission motor is connected to a frequency converter.

[0008] Preferably, as an improvement, a transition plate is provided between the transmission shaft and the coupling, and the transition plate is detachably connected to the transmission shaft.

[0009] Preferably, as an improvement, a transmission housing is provided outside the transmission shaft, and a bearing is provided between the transmission shaft and the transmission housing.

[0010] Preferably, as an improvement, the pressure inlet pipe includes an air inlet pipe and an oil inlet pipe.

[0011] Preferably, as an improvement, the pressure inlet pipeline is provided with a pressure test device and a pressure regulating valve.

[0012] Preferably, as an improvement, the oil guide hole is connected to an oil collecting pipe for collecting oil leaked from the lip seal ring.

[0013] Preferably, as an improvement, the torque sensor is a patch-type non-contact torque sensor, and the sensing patch of the torque sensor is mounted on the outer wall of the inner shell of the oil chamber.

[0014] The principles and advantages of this solution are:

[0015] 1. It can realize the test of various performances of lip seals. By implementing this device, the pumping capacity, deformation, friction torque, service life, temperature, pressure and other performances of the lip seals can be tested. It solves the problem of using multiple test equipment to test various performances of lip seals in existing testing technology. On the one hand, it reduces the cost of test equipment. On the other hand, it eliminates the need to disassemble and assemble the lip seals between multiple test equipment, greatly simplifying the test process.

[0016] 2. It can simulate the sealing performance under real environment. During actual operation, gas will inevitably enter the sealing cavity. Therefore, in order to test the performance of the lip seal under real operating environment, an air intake pipe is designed in this solution. By introducing a certain amount of gas into the oil tank, the real operating environment of the lip seal is simulated, thereby ensuring more accurate test results.

[0017] 3. At the same time, by setting a pressure regulating valve on the pressure inlet pipe, it is more conducive to testing the influence of the changes of air pressure or oil pressure on the performance of the lip seal ring by adjusting the air pressure or oil pressure during the test, so as to test the performance of the lip seal ring in a more comprehensive and diverse way. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Figure 2for Figure 1 A partial enlarged view of middle A. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods:

[0021] The figure marks in the drawings of the specification include: frame 1, oil tank 2, oil chamber outer shell 3, oil chamber inner shell 4, test gap 5, lip seal ring 6, limit plate 7, transmission shaft 8, transition plate 9, transmission housing 10, torque sensor 11, pressure inlet pipe 12, pressure sensor 13, data acquisition system 14, oil guide hole 15, transmission motor 16.

[0022] The embodiment is basically as shown in the attached Figure 1 、 Figure 2 As shown: A lip seal performance test device includes a frame 1 and an oil tank 2. The oil tank 2 includes an oil chamber outer shell 3 and an oil chamber inner shell 4. The inner diameter of the oil chamber outer shell 3 is larger than the outer diameter of the oil chamber inner shell 4. A test gap 5 for fitting a lip seal 6 is left between the oil chamber outer shell 3 and the oil chamber inner shell 4. In order to facilitate the installation and removal of the lip seal 6 during each test and to enable the lip seal 6 to effectively seal the test gap 5, a guide groove is opened axially at the right end of the oil chamber outer shell 3. The guide groove is connected to the test gap 5. The oil chamber housing 3 is connected to the test gap 5 through the guide groove, and a limit plate 7 for limiting and fixing the lip seal 6 is screwed to the right end of the oil chamber housing 3. In this way, when the lip seal 6 is installed, it can be installed in the test gap 5 through the guide groove, and the lip seal 6 is fastened in the test gap 5 through the limit plate 7. An oil guide hole 15 is opened at the corresponding position of the limit plate 7 and the lip seal 6. The height of the oil guide hole 15 is less than the height of the lip seal 6. The oil guide hole 15 is connected to an oil collecting pipe (not shown in the figure) for collecting oil leaked from the lip seal 6.

[0023] The right side of the oil chamber inner housing 4 is screwed to a drive shaft 8. The right end of the drive shaft 8 is connected to a drive motor 16 via a coupling. A transition plate 9 is connected between the drive shaft 8 and the coupling. The transition plate 9 is screwed to the drive shaft 8, facilitating disassembly and maintenance. The drive motor 16 is connected to a frequency converter for continuously variable speeds between 0 and 6000 rpm. A transmission housing 10 is mounted outside the drive shaft 8, with bearings installed between the two housings.

[0024] The left end of the oil chamber housing 3 is also connected to a pressure inlet pipe 12, which is supported by the frame 1. The pressure inlet pipe 12 includes an air inlet pipe and an oil inlet pipe. In this solution, a certain amount of air is added to the oil tank 2 for testing to simulate the sealing condition of the lip seal 6 in a real environment.

[0025] A torque sensor 11 is installed on the oil tank. In this solution, a patch-type non-contact torque sensor is used. The sensing patch of the torque sensor is installed on the outer wall of the oil chamber inner shell 4, and the torque sensor body is installed on the frame, specifically on the frame on the left side of the oil chamber outer shell. In this way, the extra space between the frame 1 and the oil chamber outer shell 3 can be fully utilized to install the torque sensor body, thereby reducing the space occupied by the experimental device.

[0026] The oil tank 2 is equipped with a pressure sensor 13, a strain gauge (not shown), and a temperature measuring element (not shown). The pressure sensor 13 is mounted on the oil chamber housing 3 to detect the pressure within the oil tank. The strain gauge is mounted on the outer surface of the lip seal 6 and contacts the oil chamber housing 3. Specifically, behind the spring of the lip seal 6, one strain gauge is installed along the circumference, with each gauge being 90° apart. The temperature measuring element can be a thermocouple. Holes are drilled in the oil side of the lip seal 6, and two thermocouples are embedded along the circumference, with each thermocouple being 90° apart.

[0027] The torque sensor 11 , the thermocouple, the strain gauge, and the pressure sensor 13 are connected to a data acquisition system 14 (existing technology) via an interface or a signal transmission cable to display the test values ​​of each sensor.

[0028] The performance test method of lip seal 6 is as follows:

[0029] Install the pressure piece and thermocouple on the lip seal 6, tighten the lip seal 6 to fix it in the test gap 5 between the oil chamber outer shell 3 and the oil chamber inner shell 4, turn on the power of the transmission motor 16, and the transmission motor 16 drives the oil chamber inner shell 4 and the lip seal 6 to rotate through the transmission shaft 8. During the transmission process, the frequency converter is controlled to reach the speed n1. After stabilization, the value measured by the torque sensor 11 is recorded through the data acquisition system 14, which is the friction torque.

[0030] Deformation and pressure test: Connect the pressure inlet pipe 12 to the pressurized test device and the pressure regulating valve, add lubricating oil and air into the oil tank 2 through the air inlet pipe and the oil inlet pipe, then turn on the power of the transmission motor 16, control the frequency converter to reach the speed n1, and after the speed stabilizes, record the temperature t of the thermocouple in the test lip seal 67, the deformation ε of the strain gauge 9, and the pressure p of the pressure sensor 13 on the oil tank through the data acquisition system 14. After the recording is completed, change the air pressure under the condition that the oil pressure remains unchanged, and measure the influence of the air pressure change on the deformation and oil leakage of the lip seal 6; conversely, change the oil pressure under the condition that the air pressure remains unchanged, and measure the influence of the oil pressure change on the deformation and oil leakage of the lip seal 6.

[0031] Pumping capacity test: Before the test, the lip seal ring 6 to be tested is run-in at low speed for 24 hours to make it in a stable state. Within the speed variation range of the transmission motor 16, the speed n is set to run for 1 hour, and the amount of lubricating oil leaked per hour is measured.

[0032] Service life test: The lip seal ring 6 is tested according to the actual working conditions simulated above until the lip seal ring 6 shows failure indicators. Specifically, the abnormal temperature of the lip seal ring 6 caused by the wear of the lip seal ring 6, excessive deformation of the lip seal ring 6, oil leakage, etc. can be used as a failure indicator of the life test to determine whether to end the test.

[0033] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A lip seal performance test device, characterized by: It includes an oil tank, which includes an oil chamber outer shell and an oil chamber inner shell. The inner diameter of the oil chamber outer shell is larger than the outer diameter of the oil chamber inner shell, and a test gap for installing a lip sealing ring is left between the oil chamber outer shell and the oil chamber inner shell. The oil chamber outer shell is detachably provided with a limit plate for limiting the lip sealing ring, and an oil guide hole is opened on the limit plate. The oil chamber inner shell is detachably connected to a transmission shaft for driving the oil chamber inner shell to rotate. The oil chamber outer shell is connected to a pressure inlet pipe. The oil tank is provided with a torque sensor, a pressure sensor, a strain gauge and a temperature measuring element.

2. A lip seal performance test device according to claim 1, characterized in that: The end of the oil chamber housing is provided with a guide groove for installing a lip seal ring.

3. A lip seal performance test device according to claim 2, characterized in that: The transmission shaft is connected to a transmission motor through a coupling, and the transmission motor is connected to a frequency converter.

4. A lip seal performance test device according to claim 3, characterized in that: A transition plate is provided between the transmission shaft and the coupling, and the transition plate is detachably connected to the transmission shaft.

5. A lip seal performance test device according to claim 4, characterized in that: A transmission housing is provided outside the transmission shaft, and a bearing is provided between the transmission shaft and the transmission housing.

6. A lip seal performance test device according to claim 5, characterized in that: The pressure inlet pipeline includes an air inlet pipeline and an oil inlet pipeline.

7. A lip seal performance test device according to claim 6, characterized in that: The pressure inlet pipeline is provided with a pressure test device and a pressure regulating valve.

8. A lip seal performance test device according to claim 7, characterized in that: The oil guide hole is connected to an oil collecting pipe for collecting oil leaked from the lip seal ring.

9. A lip seal performance test device according to claim 8, characterized in that: The torque sensor is a patch-type non-contact torque sensor, and the sensing patch of the torque sensor is installed on the outer wall of the oil chamber inner shell.

Images