A mechanical seal rotary joint running-in device and running-in method

Abstract

At present, most mechanical seal rotating joint running-in tests are performed together with the whole machine debugging when the mechanical seal rotating joint is installed in the whole mechanism. If the mechanical seal rotating joint running-in test fails, it needs to be disassembled from the whole mechanism, which seriously affects the installation and debugging progress of the whole machine. In order to overcome the deficiencies in the prior art, the present invention proposes a mechanical seal rotating joint running-in device and running-in method, which can realize the running-in test of the mechanical seal rotating joint under the flow of liquid medium, and can realize different running-in directions, running-in speeds, and medium pressure combination conditions during the running-in test.

Description

Technical Field

[0001] The invention belongs to the field of mechanical seal rotating joints, and in particular relates to a mechanical seal rotating joint running-in device and a running-in method. Background Art

[0002] Mechanical seal rotary joint is a device that realizes liquid transmission between two relatively rotating mechanisms through mechanical seal. Mechanical seal rotary joint is a key component in many applications such as national defense, chemical industry, petroleum, metallurgy and machinery manufacturing. The reliability of mechanical seal rotary joint directly affects the liquid transmission of the application mechanism. Therefore, in order to detect the changes in various parameters and their stability when the mechanical seal rotary joint works for a long time, it is necessary to conduct a running-in test on the mechanical seal rotary joint.

[0003] At present, most mechanical seal rotating joint running-in tests are performed together with the whole machine commissioning when the mechanical seal rotating joint is installed in the overall mechanism. If the mechanical seal rotating joint running-in test fails, it needs to be disassembled from the overall mechanism, which seriously affects the installation and commissioning progress of the whole machine. Some existing independent running-in devices for mechanical seal rotating joints seal a liquid medium with a certain pressure inside the rotating joint for running-in tests, which cannot fully simulate the working state of a liquid medium with a certain pressure flowing in the mechanical seal rotating joint under actual working conditions. Moreover, the pressurized liquid medium is sealed in the rotating joint, which will cause the temperature of the mechanical seal rotating joint to rise during the running-in process, thereby affecting the sealing effect of the mechanical seal auxiliary, and even causing irreversible damage to the mechanical seal rotating joint.

[0004] Currently, there is still no device that can realize the running-in test of the mechanical seal rotating joint under the flow of liquid medium, and it is impossible to quantitatively control the running-in speed, running-in direction, liquid medium pressure during the running-in test, etc. There is no running-in device and method for the mechanical seal rotating joint that is the same as the present invention. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the present invention proposes a running-in device and a running-in method for a mechanical seal rotating joint, which can realize a running-in test of the mechanical seal rotating joint under the flow of liquid medium, and can realize different running-in directions, running-in speeds, and medium pressure combination conditions during the running-in test.

[0006] The present invention provides a running-in device for a mechanical seal rotating joint, comprising a mechanical seal rotating joint (1) to be run-in, a mechanical body part, a servo transmission part and a liquid medium circulation part.

[0007] The mechanical body part comprises a running-in test platform (2), an outer shell connecting plate (6), an inner ring mounting plate (7) and an elastic pin coupling (8); the inner ring mounting plate (7), the elastic pin coupling (8) and the outer shell connecting plate (6) are placed in the middle upper part of the running-in test platform (2); the mechanical seal rotating joint (1) to be run-in is installed between the outer shell connecting plate (6) and the elastic pin coupling (8); the outer shell of the mechanical seal rotating joint (1) to be run-in is connected to the outer shell connecting plate (6); the inner ring of the mechanical seal rotating joint (1) to be run-in is connected to the elastic pin coupling (8); and the lower part of the elastic pin coupling (8) is connected to the inner ring mounting plate (7).

[0008] The servo transmission part comprises a cross cylindrical roller bearing, a transmission gear (4) and a servo motor assembly (5); the cross cylindrical roller bearing comprises a cross cylindrical roller bearing outer ring (3-1) and a cross cylindrical roller bearing inner ring (3-2); the cross cylindrical roller bearing outer ring (3-1) is connected to a housing connecting plate (6); the cross cylindrical roller bearing inner ring (3-2) is mounted on a running-in test platform (2); and the transmission gear (4) is mounted on the servo motor assembly (5).

[0009] The liquid medium circulation part comprises a liquid medium circulation unit (11), a connecting pipeline and a pressure control valve (10); the connecting pipeline comprises a mechanical seal rotating joint liquid inlet and return port connecting pipeline (9-1) and a liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2); the mechanical seal rotating joint (1) to be run-in forms a closed loop with the liquid medium circulation unit (11) through the mechanical seal rotating joint liquid inlet and return port connecting pipeline (9-1) and the liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2); and a pressure control valve is provided on the liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2).

[0010] The liquid inlet and return ports of the liquid medium circulation unit (11) are respectively connected to the liquid inlet and return ports at the lower end of the mechanical seal rotating joint (1) to be run-in through the liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2), and the liquid inlet and return ports on both sides of the mechanical seal rotating joint (1) to be run-in are connected to the mechanical seal rotating joint liquid inlet and return port connecting pipeline (9-1), so as to form a liquid medium closed circulation loop.

[0011] Furthermore, a closed loop is formed between the liquid inlet and return liquid ports of the rotating joint of the mechanical seal to be run-in and the liquid medium circulation unit through the liquid medium circulation unit (11) and the connecting pipeline, and the pressure is adjusted by the pressure control valve, thereby realizing the pressurized circulation of the liquid medium during the running-in process.

[0012] Furthermore, the mechanical seal rotating joint (1) to be run-in is fixed on the elastic pin coupling (8) to remain stationary, and the housing of the mechanical seal rotating joint (1) to be run-in is fixed on the outer ring (3-1) of the cross cylindrical roller bearing through the housing connecting plate (6) and rotates together with the outer ring (3-1) of the cross cylindrical roller bearing.

[0013] Furthermore, the servo motor assembly (5) is connected to the cross cylindrical roller bearing through a transmission gear (4), and the running direction and speed of the mechanical seal rotating joint are controlled by controlling the rotation direction and speed of the main shaft of the servo motor assembly (5).

[0014] Furthermore, the elastic pin coupling (8) can compensate for the offset between the outer shell and the inner ring of the mechanical seal rotating joint (1) to be run-in, so as to reduce the additional load caused by the relative offset between the two shafts, thereby protecting the mechanical seal rotating joint (1) to be run-in.

[0015] A mechanical seal rotary joint running-in method proposed by the present invention comprises the following steps:

[0016] Step 1: Connect and fix the lower end of the mechanical seal rotating joint (1) to be run-in with the elastic pin coupling (8) on the running-in device, connect and fix the upper end of the housing connecting plate (6) to the upper end of the mechanical seal rotating joint (1) to be run-in, and connect and fix the lower end of the housing connecting plate (6) to the outer ring (3-1) of the cross cylindrical roller bearing;

[0017] Step 2: Connect the liquid inlet and return port of the liquid medium circulation unit (11) to the liquid inlet and return port of the lower end of the mechanical seal rotating joint (1) to be run-in through the liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2), and connect the liquid inlet and return ports on both sides of the mechanical seal rotating joint to be run-in to the liquid inlet and return port connecting pipeline (9-1) of the mechanical seal rotating joint to form a closed circulation loop of the liquid medium;

[0018] Step 3: Open the liquid medium circulation unit (11), set the pressure value of the pressure control valve (10) on the liquid inlet and return pipelines, start the servo motor assembly (5), set the running-in test direction, speed and time, and start the running-in test.

[0019] The beneficial effects of the present invention are

[0020] (1) A fluid circuit system with a certain pressure liquid medium is provided, and the pressurized liquid running-in medium is provided to the mechanical seal rotating joint to be run-in through the fluid circuit system, so as to realize the running-in test of the mechanical seal rotating joint under the circulating flow environment of the pressurized liquid running-in medium.

[0021] (2) After running-in, the mechanical seal rotating joint can be directly used for the installation of the whole machine. At the same time, the mechanical seal rotating joint with hidden dangers can be found during the running-in process, avoiding the risk of disassembling the mechanical seal rotating joint after installation and running-in without running-in.

[0022] (3) By adjusting the size of the inner ring and the outer shell mounting plate, the running-in test of mechanical seal rotating joints of different sizes can be met. The structure is simple, easy to disassemble and assemble, and easy to process and manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the mechanical seal rotary joint running-in device of the present invention.

[0024] In the figure: 1. Mechanical seal rotating joint; 2. Running-in test platform; 3-1. Outer ring of cross cylindrical roller bearing; 3-2. Inner ring of cross cylindrical roller bearing; 4. Transmission gear; 5. Servo motor assembly; 6. Housing connecting plate; 7. Inner ring mounting plate; 8. Elastic pin coupling; 9-1. Liquid inlet and return connecting pipelines of mechanical seal rotating joint; 9-2. Liquid inlet and return connecting pipelines of liquid medium circulation unit; 10. Pressure control valve; 11. Liquid medium circulation unit. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Reference Figure 1 The mechanical seal rotary joint running-in device of the present invention comprises a mechanical body part, a servo transmission part and a liquid medium circulation part.

[0027] The mechanical body part includes a running-in test platform 2, an outer shell connecting plate 6, an inner ring mounting plate 7 and an elastic pin coupling 8; the inner ring mounting plate 7, the elastic pin coupling 8 and the outer shell connecting plate 6 are placed in the middle and upper part of the running-in test platform 2, the mechanical seal rotating joint 1 to be run-in is installed between the outer shell connecting plate 6 and the elastic pin coupling 8, the outer shell of the mechanical seal rotating joint to be run-in is connected to the outer shell connecting plate 6, the inner ring of the mechanical seal rotating joint to be run-in is connected to the elastic pin coupling 8, and the lower part of the elastic pin coupling 8 is connected to the inner ring mounting plate 7, and the elastic pin coupling 8 can compensate for the offset of the outer shell and the inner ring of the mechanical seal rotating joint 1 to reduce the additional load caused by the relative offset of the two shafts, thereby protecting the mechanical seal rotating joint 1 to be run-in.

[0028] The servo transmission part includes a crossed cylindrical roller bearing, a transmission gear 4 and a servo motor assembly 5; the crossed cylindrical roller bearing includes a crossed cylindrical roller bearing outer ring 3-1 and a crossed cylindrical roller bearing inner ring 3-2, the crossed cylindrical roller bearing outer ring 3-1 is connected to the shell connecting plate 6, the crossed cylindrical roller bearing inner ring 3-2 is installed on the running-in test platform 2, the transmission gear 4 is installed on the servo motor assembly 5, and the transmission gear 4 and the crossed cylindrical roller bearing outer ring 3-1 are gear-driven; the servo motor assembly 5 can control its own rotation direction and speed, and then control the running-in direction and speed.

[0029] The liquid medium circulation part includes a liquid medium circulation unit 11, connecting pipelines and a pressure control valve 10; the connecting pipelines include a mechanical seal rotating joint liquid inlet and return port connecting pipeline 9-1 and a liquid medium circulation unit liquid inlet and return port connecting pipeline 9-2, the mechanical seal rotating joint 1 to be run-in forms a closed loop with the liquid medium circulation unit 11 through the mechanical seal rotating joint liquid inlet and return port connecting pipeline 9-1 and the liquid medium circulation unit liquid inlet and return port connecting pipeline 9-2, thereby realizing liquid medium circulation; pressure control valves are respectively provided on the liquid inlet and return port pipelines of the liquid medium circulation unit to realize liquid circulating medium pressure control.

[0030] The running-in method of the mechanical seal rotary joint running-in device of the present invention comprises the following steps:

[0031] Step 1: Connect and fix the lower end of the mechanical seal rotating joint 1 to be run-in with the elastic pin coupling 8 on the running-in device, connect and fix one end of the shell connecting plate 6 to the upper end of the mechanical seal rotating joint 1 to be run-in, and connect and fix the other end of the shell connecting plate 6 to the outer ring 3-1 of the cross cylindrical roller bearing.

[0032] Step 2: Connect the liquid inlet and return port of the liquid medium circulation unit 11 to the liquid inlet and return port of the lower end of the mechanical seal rotating joint 1 to be run-in through the liquid medium circulation unit liquid inlet and return port connecting pipeline 9-2, and connect the liquid inlet and return ports on both sides of the mechanical seal rotating joint to be run-in to the mechanical seal rotating joint liquid inlet and return port connecting pipeline 9-1 to form a closed circulation loop of the liquid medium.

[0033] Step 3: Open the liquid medium circulation unit 11, set the pressure value of the pressure control valve 10 on the inlet and return liquid pipelines, start the servo motor combination 5, set the running-in test direction, speed and time, and then perform the running-in test.

[0034] The present invention is not limited to the above specific implementations, and the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made to the above implementations based on the technical essence of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mechanical seal rotary joint running-in device, characterized in that: It comprises a mechanical seal rotating joint (1) to be run-in, a mechanical body part, a servo transmission part and a liquid medium circulation part; The mechanical body part comprises a running-in test platform (2), an outer shell connecting plate (6), an inner ring mounting plate (7) and an elastic pin coupling (8); the inner ring mounting plate (7), the elastic pin coupling (8) and the outer shell connecting plate (6) are placed in the middle upper part of the running-in test platform (2); the mechanical seal rotating joint (1) to be run-in is installed between the outer shell connecting plate (6) and the elastic pin coupling (8); the outer shell of the mechanical seal rotating joint (1) to be run-in is connected to the outer shell connecting plate (6); the inner ring of the mechanical seal rotating joint (1) to be run-in is connected to the elastic pin coupling (8); and the lower part of the elastic pin coupling (8) is connected to the inner ring mounting plate (7); The servo transmission part comprises a cross cylindrical roller bearing, a transmission gear (4) and a servo motor assembly (5); the cross cylindrical roller bearing comprises a cross cylindrical roller bearing outer ring (3-1) and a cross cylindrical roller bearing inner ring (3-2); the cross cylindrical roller bearing outer ring (3-1) is connected to a housing connecting plate (6); the cross cylindrical roller bearing inner ring (3-2) is mounted on a running-in test platform (2); and the transmission gear (4) is mounted on the servo motor assembly (5); The liquid medium circulation part comprises a liquid medium circulation unit (11), a connecting pipeline and a pressure control valve (10); the connecting pipeline comprises a mechanical seal rotating joint liquid inlet and return port connecting pipeline (9-1) and a liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2); the mechanical seal rotating joint (1) to be run-in forms a closed loop with the liquid medium circulation unit (11) through the mechanical seal rotating joint liquid inlet and return port connecting pipeline (9-1) and the liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2); and a pressure control valve is provided on the liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2); The liquid inlet and return ports of the liquid medium circulation unit (11) are respectively connected to the liquid inlet and return ports at the lower end of the mechanical seal rotating joint (1) to be run-in through the liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2), and the liquid inlet and return ports on both sides of the mechanical seal rotating joint (1) to be run-in are connected to the mechanical seal rotating joint liquid inlet and return port connecting pipeline (9-1), so as to form a liquid medium closed circulation loop.

2. A mechanical seal rotary joint running-in device according to claim 1, characterized in that: The liquid medium circulation unit (11) and the connecting pipeline are used to form a closed loop between the liquid inlet and return port of the rotating joint of the mechanical seal to be run-in and the liquid medium circulation unit, and the pressure is adjusted by the pressure control valve, thereby achieving pressurized circulation of the liquid medium during the running-in process.

3. A mechanical seal rotary joint running-in device according to claim 1, characterized in that: The mechanical seal rotating joint (1) to be run-in is fixed on the elastic pin coupling (8) and remains stationary. The housing of the mechanical seal rotating joint (1) to be run-in is fixed on the outer ring (3-1) of the cross cylindrical roller bearing through the housing connecting plate (6) and rotates together with the outer ring (3-1) of the cross cylindrical roller bearing.

4. A mechanical seal rotary joint running-in device according to claim 1, characterized in that: The servo motor assembly (5) is connected to the cross cylindrical roller bearing through a transmission gear (4), and the running direction and speed of the mechanical seal rotating joint are controlled by controlling the rotation direction and speed of the main shaft of the servo motor assembly (5).

5. The mechanical seal rotary joint running-in device according to claim 1, characterized in that: The elastic pin coupling (8) can compensate for the offset between the outer shell and the inner ring of the mechanical seal rotating joint (1) to be run-in, so as to reduce the additional load caused by the relative offset between the two shafts, thereby protecting the mechanical seal rotating joint (1) to be run-in.

6. A running-in method for a mechanical seal rotary joint running-in device according to claim 1, characterized in that: The following steps are involved: Step 1: Connect and fix the lower end of the mechanical seal rotating joint (1) to be run-in with the elastic pin coupling (8) on the running-in device, connect and fix the upper end of the housing connecting plate (6) to the upper end of the mechanical seal rotating joint (1) to be run-in, and connect and fix the lower end of the housing connecting plate (6) to the outer ring (3-1) of the cross cylindrical roller bearing; Step 2: Connect the liquid inlet and return port of the liquid medium circulation unit (11) to the liquid inlet and return port of the lower end of the mechanical seal rotating joint (1) to be run-in through the liquid medium circulation unit liquid inlet and return port connecting pipeline (9-2), and connect the liquid inlet and return ports on both sides of the mechanical seal rotating joint to be run-in to the liquid inlet and return port connecting pipeline (9-1) of the mechanical seal rotating joint to form a closed circulation loop of the liquid medium; Step 3: Open the liquid medium circulation unit (11), set the pressure value of the pressure control valve (10) on the liquid inlet and return pipelines, start the servo motor assembly (5), set the running-in test direction, speed and time, and start the running-in test.

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