A method for using a double-end sealed dynamic operation test bench

Abstract

The present invention discloses a double-end seal dynamic operation test bench, which includes a first main shaft, a motor, a second main shaft and a base. The present application simulates the structure of an on-site machine pump, which is equivalent to a double-support pump, symmetrical on both sides, and forms a sealing cavity on each side of the motor. A set of seals is installed in each sealing cavity on both sides. The seal is driven to rotate by the motor, and pressure is generated in the sealing cavity. Whether the seal has leakage is determined based on the change in pressure, and the performance of the seal is effectively tested through dynamic tests. A method for using a double-end seal dynamic operation test bench is also disclosed, which performs dynamic tests on seals of different shaft diameters, and has the characteristics of flexible installation and strong versatility.

Description

Technical Field

[0001] The invention relates to the field of dynamic operation test of mechanical seals, and in particular to a double-end seal dynamic operation test bench and method. Background Art

[0002] Mechanical seals often leak when the pump is running for a long period of time, so checking for leaks is a very important task. There are two methods to test the sealing performance of mechanical seals: static leak test and dynamic leak test. The static leak test is suitable for checking for leaks in a stationary state of the pump, and is suitable for mechanical seals with obvious leaks and large leakage. However, for seals with unclear leaks and difficult to check, the inspection effect of the static leak test is not obvious. The dynamic leak test is used to check for leaks in running pumps, and the leak detection effect is relatively obvious, but the test wastes sealing fluid and affects the operating conditions of the pump. The mechanical seal operation test bench in the prior art simulates the operating conditions of the mechanical seal in the pump and solves the above problems well. However, the mechanical seal is only driven by one end of the motor for inspection, and the balance of the operation of the motor with a mechanical seal is poor, which cannot well simulate the operating conditions of the mechanical seal in the pump, and the work efficiency is low. Summary of the invention

[0003] In order to better simulate the operating conditions of mechanical seals in pumps and improve the performance of mechanical seals and the working efficiency of test benches, the present invention provides a double-end seal dynamic operation test bench and method for effectively testing the sealing performance of mechanical seals.

[0004] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0005] A double-end sealed dynamic operation test bench comprises a first main shaft, a motor, a second main shaft and a base. The two ends of the motor are respectively connected to the first main shaft and the second main shaft, and the bottom of the motor is connected to the base. A first inner flange is provided at one end of the motor, one end of the first inner flange is connected to one end of the motor, a first bracket is provided at the other end of the first inner flange, one end of the first bracket is connected to the other end of the first inner flange, a first outer flange is provided at the other end of the first bracket, one end of the first outer flange is connected to the other end of the first bracket, a first end cover is provided at the other end of the first outer flange, and the first end cover is connected to the other end of the first outer flange.

[0006] A second inner flange is provided at the other end of the motor, one end of the second inner flange is connected to one end of the motor, a second bracket is provided at the other end of the second inner flange, one end of the second bracket is connected to the other end of the second inner flange, a second outer flange is provided at the other end of the second bracket, one end of the second outer flange is connected to the other end of the second bracket, a second end cover is provided at the other end of the second outer flange, and the second end cover is connected to the other end of the second outer flange.

[0007] Compared with the prior art, the present invention has the following advantages:

[0008] This application simulates the structure of an on-site machine pump, which is equivalent to a double-support pump with symmetry on both sides. A sealed cavity is formed on each side of the motor, and a set of seals is installed in each of the sealed cavities on both sides. The seal is driven to rotate by the motor and pressure is generated in the sealed cavity. The presence of a seal leak is determined based on the change in pressure, and the performance of the seal is effectively tested through dynamic tests.

[0009] More preferably, the first main shaft is provided with a first sleeve, the first sleeve is connected to the first main shaft, and the second main shaft is provided with a second sleeve, the second sleeve is connected to the second main shaft.

[0010] The above technical solution is equivalent to a double-support pump. Two sets of seals can be installed on the two shaft sleeves at the same time to test their sealing performance.

[0011] It is further preferred that: the first sleeve and the second sleeve are both variable diameter sleeves.

[0012] By adopting the above technical solution, seals with different shaft diameters can be installed and tested, and the installation is flexible and the versatility is strong.

[0013] Further preferably, a first pillar is provided at the bottom of the first bracket, an upper end of the first pillar is welded to the bottom of the first bracket, and a lower end of the first pillar is connected to the base.

[0014] By adopting the above technical solution, the first pillar supports the first bracket, and the first bracket is rigidly connected to the base, so as to achieve the purpose of supporting the entire test bench.

[0015] It is further preferred that the first pillar is made of No. 45 steel.

[0016] By adopting the above technical scheme, No. 45 steel has strong comprehensive mechanical properties and high strength. The first pillar made of No. 45 steel has strong load-bearing capacity and has a good supporting effect on the test bench.

[0017] Further preferably, a second support column is provided at the bottom of the second bracket, an upper end of the second support column is welded to the bottom of the second bracket, and a lower end of the second support column is connected to the base.

[0018] By adopting the above technical solution, the second support column supports the second bracket, and the second bracket is rigidly connected to the base, so as to achieve the purpose of supporting the entire test bench.

[0019] It is further preferred that the second pillar is made of No. 45 steel.

[0020] By adopting the above technical scheme, No. 45 steel has strong comprehensive mechanical properties and high strength. The first pillar made of No. 45 steel has strong load-bearing capacity and has a good supporting effect on the test bench.

[0021] A method for using a double-end sealed dynamic operation test bench, characterized in that it includes the following steps:

[0022] Step 1. Remove the first end cover, the first outer flange and the first bracket.

[0023] Step 2. Install the first bushing and seal.

[0024] Step 3. Reinstall the first bracket, the first outer flange and the first end cover.

[0025] Step 4. Remove the second end cover, the second outer flange and the second bracket.

[0026] Step 5. Second bushing and seal.

[0027] Step 6. Reinstall the second bracket, the second outer flange and the second end cover.

[0028] Step 7: Start the motor to start working, and the seal generates pressure as the first main shaft and the second main shaft rotate.

[0029] Step 8. Check the sealing performance of the seal according to the pressure change.

[0030] The above technical solution can not only more effectively test the sealing performance of the mechanical seal, but also can be used to perform dynamic tests on seals of different shaft diameters by replacing the shaft sleeve, thereby having the characteristics of flexible installation and strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of this embodiment;

[0032] Figure 2 is a schematic diagram of this embodiment;

[0033] Figure 3 is a schematic diagram of the present embodiment in which the seal is installed;

[0034] In the figure, 1-first main shaft; 2-motor; 3-second main shaft; 4-first pressure gauge; 5-second pressure gauge; 6-first bracket; 7-second bracket; 8-first bushing; 9-second bushing; 10-base; 11-motor bracket; 12-first outer flange; 13-second outer flange; 14-first inner flange; 15-second inner flange; 16-first end cover; 17-second end cover; 18-first sealing cavity; 19-second sealing cavity; 20-motor shaft; 21-first baffle; 22-second baffle; 60-first pillar; 70-second pillar; 100-first sealing member; 101-second sealing member; 200-first oil inlet pipe; 201-first oil outlet pipe; 300-second oil inlet pipe; 301-second oil outlet pipe. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1 , Figure 2 as well as Figure 3 The present invention is described in further detail.

[0036] like Figure 1 and Figure 2 As shown, a double-end sealed dynamic operation test bench is composed of a first main shaft 1, a motor 2, a second main shaft 3 and a base 10. A motor shaft 20 is provided on the motor 2, and the motor shaft 20 is detachably connected to the motor 2, and the two ends of the motor shaft 20 are respectively connected to the first main shaft 1 and the second main shaft 3. A motor bracket 11 is provided at the bottom of the motor 2, the upper end of the motor bracket 11 is welded to the bottom of the motor 2, and the lower end of the motor bracket 11 is connected to the base 10 by bolts.

[0037] A first inner flange 14 is provided at one end of the motor 2, one end of the first inner flange 14 is connected to one end of the motor 2 by bolts, a first bracket 6 is provided at the other end of the first inner flange 14, one end of the first bracket 6 is connected to the other end of the first inner flange 14 by bolts. A first outer flange 12 is provided at the other end of the first bracket 6, one end of the first outer flange 12 is connected to the other end of the first bracket 6 by bolts, a first end cover 16 is provided at the other end of the first outer flange 12, and the first end cover 16 is connected to the other end of the first outer flange 12 by bolts. The first end cover 16, the first outer flange 12, the first bracket 6 and the first inner flange 14 form a first sealed cavity 18.

[0038] A first pressure gauge 4 is provided on the top of the first end cover 16, and the first pressure gauge 4 is connected to the top of the first end cover 16 through a nut. A first oil inlet pipe 200 is provided at the bottom of the first end cover 16, and the first oil inlet pipe 200 is externally connected to a lubricating oil inlet pipe, which is an existing standard part.

[0039] like Figure 3As shown, a first oil outlet pipe 201 is provided at the top of the first bracket 6, and the first oil outlet pipe 201 is externally connected to a lubricating oil outlet pipe, which is an existing standard part. A first support 60 is provided at the bottom of the first bracket 6, and the upper end of the first support 60 is welded to the bottom of the first bracket 6, and the lower end of the first support 60 is connected to the base 10 by bolts, and the first support 60 plays the role of the first bracket 6 and the seal. In order to support the relatively heavy test tower and seal, the first support 60 is made of 45 steel, which has good comprehensive mechanical properties and high strength, and can better play a supporting role.

[0040] The sealing member includes a first sealing member 100 and a second sealing member 101 .

[0041] In the first sealed cavity 18, a first main shaft 1 is disposed at one end of the motor shaft 20, and one end of the first main shaft 1 is detachably connected to one end of the motor shaft 20. A first baffle 21 is disposed at the other end of the first main shaft 1, and the first baffle 21 is connected to the other end of the first main shaft 1 by bolts. A first sleeve 8 is disposed on the first main shaft 1, and the first sleeve 8 is key-connected to the first main shaft 1. Figure 3 A first sealing member 100 is disposed on the first sleeve 8 , and the first sealing member 100 is detachably connected to the first sleeve 8 .

[0042] The other end of the motor 2 is provided with a second inner flange 15, one end of the second inner flange 15 is connected to one end of the motor 2 by bolts, the other end of the second inner flange 15 is provided with a second bracket 7, one end of the second bracket 7 is connected to the other end of the second inner flange 15 by bolts, the other end of the second bracket 7 is provided with a second outer flange 13, one end of the second outer flange 13 is connected to the other end of the second bracket 7 by bolts, the other end of the second outer flange 13 is provided with a second end cover 17, and the second end cover 17 is connected to the other end of the second outer flange 13 by bolts. The second end cover 17, the second outer flange 13, the second bracket 7 and the second inner flange 15 form a second sealed cavity 19.

[0043] A second pressure gauge 5 is provided on the top of the second end cover 17, and the second pressure gauge 5 is connected to the top of the second end cover 17 through a nut. A second oil inlet pipe 300 is provided at the bottom of the second end cover 17, and the second oil inlet pipe 300 is externally connected to a lubricating oil inlet pipe, which is an existing standard part.

[0044] like Figure 3As shown, a second oil outlet pipe 301 is provided at the top of the second bracket 7, and the second oil outlet pipe 301 is externally connected to a lubricating oil outlet pipe, which is an existing standard part. A second support column 70 is provided at the bottom of the second bracket 7, and the upper end of the second support column 70 is welded to the bottom of the second bracket 7, and the lower end of the second support column 70 is connected to the base 10 by bolts, and the second support column 70 plays the role of the second bracket 7 and the seal. In order to support the relatively heavy test tower and seal, the second support column 70 is made of 45 steel, which has good comprehensive mechanical properties and high strength, and can better play a supporting role.

[0045] In the second sealed cavity 19, the other end of the motor shaft 20 is provided with a second main shaft 3, one end of the second main shaft 3 is detachably connected to the other end of the motor shaft 20, the other end of the second main shaft 3 is provided with a second baffle 22, the second baffle 22 is connected to the other end of the second main shaft 3 by bolts, and the second main shaft 3 is provided with a second sleeve 9, which is key-connected to the second main shaft 3. Figure 3 A second sealing member 101 is disposed on the second shaft sleeve 9 , and the second sealing member 101 is detachably connected to the second shaft sleeve 9 .

[0046] Both ends of the motor shaft 20 can be connected to the first main shaft 1 and the second main shaft 3 of different shaft diameters within ￠120 (including ￠120) at the same time, so that the present application can perform dynamic tests on seals of different shaft diameters within ￠120 shaft diameter, with flexible installation, strong versatility and wide application range.

[0047] Test principle: Lubricating oil is injected from the first oil inlet pipe 200 and the second oil inlet pipe 300 respectively, so that the lubricating oil fills the first sealing cavity 18 and the second sealing cavity 19, and lubricates the sealed friction pair. Start the motor 2, the motor shaft 20 rotates at high speed, and the motor shaft 20 drives the first main shaft 1 and the second main shaft 3 to rotate at the same time. The first sleeve 8 rotates with the first main shaft 1, and the first seal 100 rotates with the first main shaft 1 to generate centrifugal force. The centrifugal force forms pressure in the first sealing cavity 18, and the pressure value is displayed by the first pressure gauge 4. If the pressure value remains stable within a certain range, the first seal 100 has no leakage point and its sealing performance is good. If the pressure value fluctuates greatly or even drops quickly, the first seal 100 has a leakage point and poor sealing performance. At the same time, the second sleeve 9 rotates with the second main shaft 3, and the second seal 100 rotates with the second main shaft 3 to generate centrifugal force. The centrifugal force forms pressure in the second sealing cavity 19, and the pressure value is displayed by the second pressure gauge 5. If the pressure value remains stable within a certain range, the second seal 101 has no leakage points and its sealing performance is good. If the pressure value fluctuates greatly or even drops quickly, the second seal 101 has leakage points and poor sealing performance.

[0048] A method for using a double-end seal dynamic operation test bench method, refer to Figure 1 and Figure 2 , including the following steps:

[0049] Step 1. Loosen the bolts and remove the first end cover 16, the first outer flange 12 and the first bracket 6 in sequence.

[0050] Step 2. Select a first sleeve 8 corresponding to the shaft diameter of the first seal 100, install the first sleeve 8 on the first main shaft 1, install the first seal 100 on the first sleeve 8, and fix it with bolts.

[0051] Step 3. Reinstall the first bracket 6 , connect one end of the first bracket 6 to the other end of the first inner flange 14 by bolts, and connect the lower end of the first bracket 6 to the base 10 .

[0052] Step 4. Reinstall the first outer flange 12 and connect one end of the first outer flange 12 to the other end of the first bracket 6 by bolts.

[0053] Step 5. Reinstall the first end cover 16 and connect the first end cover 16 to the other end of the first outer flange 12 by bolts.

[0054] Step 6. Loosen the bolts and remove the second end cover 17, the second outer flange 13 and the second bracket 7 in sequence.

[0055] Step 7. Select the second sleeve 9 corresponding to the shaft diameter of the second seal 101, install the second sleeve 9 on the second main shaft 3, install the second seal 101 on the second sleeve 9, and fix it with bolts.

[0056] Step 8. Reinstall the second bracket 7 , connect one end of the second bracket 7 to the other end of the second inner flange 15 by bolts, and connect the lower end of the second bracket 7 to the base 10 .

[0057] Step 9. Reinstall the second outer flange 13 and connect one end of the second outer flange 13 to the other end of the second bracket 7 by bolts.

[0058] Step 10. Reinstall the second end cover 17, and connect the second end cover 17 to the other end of the second outer flange 13 via bolts.

[0059] Step 11. Inject lubricating oil into the first oil inlet pipe 200 and the second oil inlet pipe 300 respectively.

[0060] Step 12. Power the motor 2, start the motor 2 to start working, the motor shaft 20 rotates, one end of the motor shaft 20 drives the first main shaft 1 to rotate, the first main shaft 1 rotates to drive the first sleeve 8 to rotate, the first sleeve 8 rotates to drive the first seal 100 to rotate, the first seal 100 rotates to generate centrifugal force and generate pressure in the first sealing cavity 18, and the specific pressure value is displayed by the first pressure gauge 4. The lubricating oil flows out from the first oil outlet pipe 201 to the lubricating oil outlet pipe.

[0061] Step 13. The other end of the motor shaft 20 drives the second main shaft 3 to rotate, the rotation of the second main shaft 3 drives the second sleeve 9 to rotate, the rotation of the second sleeve 9 drives the second seal 101 to rotate, the rotation of the second seal 101 generates centrifugal force and generates pressure in the second sealing cavity 19, and the specific pressure value is displayed by the second pressure gauge 5. The lubricating oil flows out from the second oil outlet pipe 301 to the lubricating oil outlet pipe.

[0062] Step 14. During operation, if the real-time pressure display values ​​of the first pressure gauge 4 and the second pressure gauge 5 are stable and unchanged within a certain range, it means that the lubricating oil has not entered the first seal 100 and the second seal 101, and it is judged that the first seal 100 and the second seal 101 are not leaking, and the sealing performance is good. If the real-time pressure display value of the first pressure gauge 4 continues to drop from a certain pressure value, or the pressure of the first pressure gauge 4 is always at a low value, it means that the lubricating oil has entered the first seal 100, and it is judged that the first seal 100 has a leak and the sealing performance is poor. If the real-time pressure display value of the second pressure gauge 5 continues to drop from a certain pressure value, or the pressure of the second pressure gauge 5 is always at a low value, it means that the lubricating oil has entered the second seal 101, and it is judged that the second seal 101 has a leak and the sealing performance is poor. This method can be used to test the sealing performance of the sealing device, and by replacing the sleeve, it can be used to test the leakage of seals of different shaft diameters. It has strong versatility and achieves a good effect of multiple uses.

[0063] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make non-creative modifications to this embodiment as needed, but as long as it is within the protection scope of the present invention, it will be protected by the patent law.

Claims

1. A method for using a double-end sealed dynamic operation test bench, characterized in that: The following steps are involved: Step 1. Remove the first end cover (16), the first outer flange (12) and the first bracket (6); Step 2. Install the first sleeve (8) and the seal; Step 3. Reinstall the first bracket (6), the first outer flange (12) and the first end cover (16); Step 4. Remove the second end cover (17), the second outer flange (13) and the second bracket (7); Step 5. Install the second sleeve (9) and the seal; Step 6. Reinstall the second bracket (7), the second outer flange (13) and the second end cover (17); Step 7. Start the motor (2) to start working, and the seal generates pressure as the first main shaft (1) and the second main shaft (3) rotate; the motor shaft (20) rotates, and one end of the motor shaft (20) drives the first main shaft (1) to rotate, and the rotation of the first main shaft (1) drives the first sleeve (8) to rotate, and the rotation of the first sleeve (8) drives the first seal (100) to rotate, and the rotation of the first seal (100) generates centrifugal force and generates pressure in the first sealing cavity (18), and the specific pressure value is displayed by the first pressure gauge (4), and the lubricating oil flows out from the first oil outlet pipe (201) to the lubricating oil outlet pipe; The other end of the motor shaft (20) drives the second main shaft (3) to rotate, the rotation of the second main shaft (3) drives the second sleeve (9) to rotate, the rotation of the second sleeve (9) drives the second seal (101) to rotate, the rotation of the second seal (101) generates centrifugal force and generates pressure in the second sealing cavity (19), and the specific pressure value is displayed by the second pressure gauge (5); the lubricating oil flows out from the second oil outlet pipe (301) to the lubricating oil outlet pipe; Step 8. Check the sealing performance of the seal according to the change in pressure; during operation, if the real-time pressure display values ​​of the first pressure gauge (4) and the second pressure gauge (5) remain stable and unchanged within a certain range, it means that the lubricating oil has not entered the first seal (100) and the second seal (101), thereby judging that the first seal (100) and the second seal (101) are not leaking and have good sealing performance; if the real-time pressure display value of the first pressure gauge (4) continuously decreases from a certain pressure value, or the pressure of the first pressure gauge (4) is always at a low value, it means that the lubricating oil has entered the first seal (100), thereby judging that the first seal (100) has leakage and has poor sealing performance; if the real-time pressure display value of the second pressure gauge (5) continuously decreases from a certain pressure value, or the pressure of the second pressure gauge (5) is always at a low value, it means that the lubricating oil has entered the second seal (101), thereby judging that the second seal (101) has leakage; The double-end sealed dynamic operation test bench comprises a first main shaft (1), a motor (2), a second main shaft (3) and a base (10); two ends of the motor (2) are respectively connected to the first main shaft (1) and the second main shaft (3); the bottom of the motor (2) is connected to the base (10); a first inner flange (14) is provided at one end of the motor (2), one end of the first inner flange (14) is connected to one end of the motor (2), a first bracket (6) is provided at the other end of the first inner flange (14), one end of the first bracket (6) is connected to the other end of the first inner flange (14), a first outer flange (12) is provided at the other end of the first bracket (6), one end of the first outer flange (12) is connected to the other end of the first bracket (6), a first end cover (16) is provided at the other end of the first outer flange (12), and the first end cover (16) is connected to the other end of the first outer flange (12); The other end of the motor (2) is provided with a second inner flange (15), one end of the second inner flange (15) is connected to the other end of the motor (2), the other end of the second inner flange (15) is provided with a second bracket (7), one end of the second bracket (7) is connected to the other end of the second inner flange (15), the other end of the second bracket (7) is provided with a second outer flange (13), one end of the second outer flange (13) is connected to the other end of the second bracket (7), the other end of the second outer flange (13) is provided with a second end cover (17), and the second end cover (17) is connected to the other end of the second outer flange (13); the two ends of the motor shaft (20) can be simultaneously connected to the first main shaft (1) and the second main shaft (3) with different shaft diameters within ￠120 (including ￠120); The first main shaft (1) is provided with a first shaft sleeve (8), and the first shaft sleeve (8) is connected to the first main shaft (1); the second main shaft (3) is provided with a second shaft sleeve (9), and the second shaft sleeve (9) is connected to the second main shaft (3); The first shaft sleeve (8) and the second shaft sleeve (9) are both variable diameter shaft sleeves.

2. The method for using the double-end sealed dynamic operation test bench according to claim 1 is characterized in that: A first support column (60) is provided at the bottom of the first bracket (6), the upper end of the first support column (60) is welded to the bottom of the first bracket (6), and the lower end of the first support column (60) is connected to the base (10).

3. The method for using the double-end sealed dynamic operation test bench according to claim 2 is characterized by: The first support column (60) is made of 45 steel.

4. The method for using the double-end sealed dynamic operation test bench according to claim 1 is characterized in that: A second support column (70) is provided at the bottom of the second bracket (7), the upper end of the second support column (70) is welded to the bottom of the second bracket (7), and the lower end of the second support column (70) is connected to the base (10).

5. The method for using the double-end sealed dynamic operation test bench according to claim 4 is characterized in that: The second support column (70) is made of 45 steel.

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