A rotary union testing system

Abstract

The utility model discloses a rotary joint test system, and the rotary joint includes the clearance fit inner shaft, shell, is passed through and is set up on the shell and has the oil inlet A, oil inlet B, oil return port L, and the test system includes the test oil circuit, and the test oil circuit includes the main oil circuit that is communicated to the oil tank through the pump, and the main oil circuit is connected to the oil circuit no.

Description

Technical Field

[0001] This utility model relates to the field of testing device technology, and in particular to a rotary joint testing system. Background Technology

[0002] A rotary joint is a precision adapter that transfers fluid (such as liquid) from a stationary pipe to a rotating or reciprocating device. It has a wide range of applications and is suitable for industrial environments where media need to be transferred to / from rotating rollers, drums, turntables, or spindles.

[0003] To facilitate transition applications, rotary joints typically consist of a rotating part and a fixed part, such as a rotating inner shaft and a fixed outer shell. The inner shaft is rotatably fitted relative to the outer shell, and fluid entering from the outer shell exits through the inner shaft. To ensure smooth and reliable relative rotation, a gap seal is usually used between the inner shaft and the outer shell. Different gap values ​​are set according to different usage requirements and scenarios.

[0004] Different clearance settings correspond to different leakage rates for the gap seal, while the leakage rate is a relatively constant value under the same clearance setting. In actual operation, due to the existence of form and position tolerances, the rotary joint will be affected by machining and assembly, resulting in unstable quality, such as uneven rotation and coaxiality deviation. This causes the leakage rate of the gap seal to deviate, even far exceeding the preset constant value, seriously affecting the normal use of the rotary joint. Therefore, it is necessary to conduct quality inspection on the rotary joint to determine whether there are any abnormalities in its gap seal performance.

[0005] In the existing technology, there is no device or system for testing the gap sealing performance of rotary joints, and it is impossible to effectively test the gap sealing performance of rotary joints. Utility Model Content

[0006] To address the aforementioned issues, this application provides a reasonably structured rotary joint testing system, which enables the testing of the rotary joint gap sealing performance, effectively helping to ensure the gap sealing performance and quality of the rotary joint. The system is easy to operate and reliable in testing.

[0007] The technical solution adopted in this utility model is as follows: A rotary joint testing system is disclosed. The rotary joint includes an inner shaft and a housing with clearance fitting. An oil inlet A, an oil inlet B, and an oil return port L are provided through the housing. The testing system includes a test oil circuit, which includes a main oil circuit connected to an oil tank via a pump. The main oil circuit is split into two oil circuits via a three-way valve: oil circuit one is connected to oil inlet A, and a return branch A is connected to one side of the oil circuit. Oil circuit two is connected to oil inlet B, and a return branch B is connected to one side of the oil circuit. The system also includes a return branch C connected to the return port L. As a further improvement to the above technical solution: The first oil circuit is equipped with a flow meter 1, which measures the oil inflow or return flow at inlet A; the second oil circuit is equipped with a flow meter 2, which measures the oil inflow or return flow at inlet B; when in the oil inflow state, the corresponding flow meter measures the oil inflow, and when in the oil return state, the corresponding flow meter measures the oil return, which is the leakage amount occurring at the corresponding inlet.

[0008] The return port L is in the return state; both the inlet port A and the inlet port B are in the inlet state, or one is in the inlet state and the other is in the return state.

[0009] The rotary joint is supported and fixed on an external platform by the outer shell. The end of the inner shaft is connected to the rotation drive power. The rotation drive power drives the inner shaft to rotate relative to the outer shell. Combined with the oil inlet A and oil inlet B oil inlet settings, the sealing performance of the gap between the outer shell and the inner shaft is dynamically tested.

[0010] The first oil circuit is connected in series with the first valve and the first flow meter and connected to the oil inlet A. The oil circuit between the first valve and the first flow meter is connected to the return oil branch A. The return oil branch A is connected in series with the second valve and connected to the return oil first. When the first valve is in the connected state and the second valve is in the disconnected state, the oil inlet A is in the oil inlet state. Otherwise, the oil inlet A is in the oil return state.

[0011] The oil circuit 2 is connected in series with valve 3 and flow meter 2 and connected to oil inlet B. The oil circuit 2 located between valve 3 and flow meter 2 is connected to oil return branch B. The oil return branch B is connected in series with valve 4 and connected to oil return 2. When valve 3 is in the connected state and valve 4 is in the disconnected state, oil inlet B is in the oil inlet state, and vice versa.

[0012] Pressure sensor 1 is installed at oil inlet A to monitor the pressure at oil inlet A, and pressure sensor 2 is installed at oil inlet B to monitor the pressure at oil inlet B.

[0013] A filter assembly and a check valve are connected to the main oil line located between the pump and the three-way valve; a branch line connecting to the oil tank is also connected to the main oil line located between the pump and the filter assembly, and a main circuit valve is connected to the branch line.

[0014] It also includes an oil cooler, and a cooling circuit is connected between the oil tank and the oil cooler to cool the oil in the tank; the oil tank is also equipped with a thermometer and a level gauge to monitor the oil temperature and level in the tank in real time.

[0015] The gap seal between the inner shaft and the outer shell of the rotary joint is disassembled into three sections along the axial direction according to the positions of oil inlet A and oil inlet B: the first section located between oil inlet A and oil return port L, the second section located between oil inlet A and oil inlet B, and the third section located between oil inlet B and oil return port L.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This utility model, through the oil inlet and return settings at oil inlets A and B, can test the leakage under different test settings according to test requirements, and realize the test of the gap sealing performance between the inner shaft and the outer shell of the rotary joint. It effectively helps to ensure the gap sealing performance of the rotary joint, ensure the quality of the rotary joint, and is easy to operate and reliable in testing. This utility model also has the following advantages: The flow meter in oil circuit 1 measures the oil inlet or return at inlet A, and the flow meter in oil circuit 2 measures the oil inlet or return at inlet B, satisfying different oil inlet or return setting test requirements. The structure is simplified and the connection layout is ingenious and reasonable. By cleverly utilizing the two oil inlets and one oil return port on the rotary joint, the gap sealing section between the inner shaft and the outer shell of the rotary joint is divided into three sections. Through oil circuit connection and test settings, a comprehensive leakage test is conducted on the gap sealing section, effectively ensuring the sealing performance of the rotary joint and guaranteeing quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the test system of this utility model.

[0018] Figure 2 This is a schematic diagram of the rotary joint of this utility model.

[0019] Figure 3 This is a schematic diagram of the pipeline connection of the testing system of this utility model.

[0020] The components include: 1. Main oil circuit; 2. Three-way valve; 3. Check valve; 4. Filter assembly; 5. Pump; 6. Thermometer; 7. Oil tank; 8. Level gauge; 9. Main circuit valve. 10. Rotary drive power; 20. Rotary joint; 30. Test oil circuit; 40. Cooling circuit; 50. V-type support; 21. Oil inlet A; 22. Oil inlet B; 23. Oil return port L; 24. Inner shaft; 25. Housing; 31. Oil circuit one; 32. Oil circuit two; 33. Main return oil; 311. Valve 1; 312. Return oil 1; 313. Valve 2; 314. Flow meter 1; 315. Pressure sensor 1; 321. Valve 3; 322. Valve 4; 323. Return oil 2; 324. Flow meter 2; 325. Pressure sensor 2. Detailed Implementation

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, a rotary joint testing system includes a rotary joint 20 comprising an inner shaft 24 and a housing 25 fitted with a clearance. The housing 25 has an oil inlet A21, an oil inlet B22, and an oil return port L23. The testing system includes a test oil circuit 30, which includes a main oil circuit 1 connected to an oil tank 7 via a pump 5. The main oil circuit 1 is branched to oil circuit 31 and oil circuit 32 via a three-way valve 2. Oil circuit 31 is connected to the oil inlet A21 and has a lateral oil return branch A. Oil circuit 32 is connected to the oil inlet B22 and has a lateral oil return branch B. The system also includes an oil return branch C connected to the oil return port L23. In this embodiment, by setting the oil inlet and return at oil inlet A21 and oil inlet B22, leakage can be tested under different test settings according to test requirements, thereby achieving the test of the sealing performance of the gap between the inner shaft 24 and the outer shell 25 in the rotary joint 20.

[0023] In this embodiment, oil is supplied from the main oil line 1 to the oil inlet A21 via oil line 31, or oil is returned from the oil inlet A21 via the return branch A; similarly, oil is supplied from the main oil line 1 to the oil inlet B22 via oil line 32, or oil is returned from the oil inlet B22 via the return branch B.

[0024] In this embodiment, oil inlet A21 and oil inlet B22 can be set to oil supply state or oil return state according to different test requirements; oil return port L23 is always in oil return state through oil return branch C. In one embodiment, oil return branch C can be connected to main oil return 33.

[0025] Flow meter 314 is installed in oil circuit 31 to measure the oil inlet or return flow at inlet A21; flow meter 324 is installed in oil circuit 32 to measure the oil inlet or return flow at inlet B22; when in the oil inlet state, the corresponding flow meter measures the oil inlet flow, and when in the oil return state, the corresponding flow meter measures the oil return flow, which is the leakage amount occurring at the corresponding inlet.

[0026] In this embodiment, flow meter 314 in oil circuit 31 measures the oil inlet or return at inlet A21, and flow meter 324 in oil circuit 32 measures the oil inlet or return at inlet B22, thus meeting different oil inlet or return setting test requirements. The structure is simplified and the connection layout is ingenious and reasonable.

[0027] Oil return port L23 is in the oil return state; both oil inlet port A21 and oil inlet port B22 are in the oil inlet state, or one is in the oil inlet state and the other is in the oil return state.

[0028] In actual operation, one of the oil inlet A21 and oil inlet B22 can be set to the oil inlet state to obtain the oil inlet quantity Q. 进 Another setting is to obtain the return oil volume Q under the return oil state. 回 The leakage Q at the return port L23 L回 This is the oil inlet quantity Q. 进 With return oil volume Q 回 The difference; of course, both oil inlet AA21 and oil inlet B22 can be set to oil inlet state to obtain the oil inlet volume respectively, then the leakage volume at oil return port L23 is the sum of the oil inlet volumes at the two oil inlets.

[0029] The rotary joint 20 is supported and fixed on the external platform by the housing 25. The end of the inner shaft 24 is connected to the rotation drive power 10. The rotation drive power 10 drives the inner shaft 24 to rotate relative to the housing 25. Combined with the oil inlet A21 and oil inlet B22 oil inlet settings, the sealing performance of the gap between the housing 25 and the inner shaft 24 is dynamically tested.

[0030] In this embodiment, the inner shaft 24 is driven to rotate by the rotation drive power 10, thereby enabling the sealing performance test of the rotary joint 20 gap seal in the rotating state, which is more in line with the actual use scenario and matches and meets the actual use of the rotary joint 20.

[0031] In this embodiment, the rotation drive power 10 can be a motor assembly, which drives the inner shaft 24 to rotate according to the test requirements.

[0032] In actual operation, the rotary joint 20 can be placed and fixed on an external platform via the housing 25, for example, by being supported and fixed by the V-shaped support 50.

[0033] A valve 311 and a flow meter 314 are connected in series on oil circuit 31 and connected to the oil inlet A21. Oil circuit 31, located between valve 311 and flow meter 314, is laterally connected to return oil branch A. A valve 313 is connected in series on return oil branch A and connected to return oil 312. When valve 311 is in the connected state and valve 313 is in the disconnected state, oil inlet A21 is in the oil inlet state; otherwise, oil inlet A21 is in the oil return state.

[0034] In this embodiment, the opening and closing of valve 311 adjusts whether oil enters through the oil inlet A21 in oil circuit 31, and the opening and closing of valve 313 adjusts whether oil returns through the return branch A of the oil inlet A21. The opening and closing states of valve 311 and valve 313 are opposite to satisfy the oil inlet A21's oil entry or return. For example, when valve 311 is closed and valve 313 is open, oil inlet A21 is in the oil entry state; when valve 311 is open and valve 313 is closed, oil inlet A21 is in the oil return state.

[0035] Oil circuit 2 32 is connected in series with valve 321 and flow meter 2 324 and connected to oil inlet B22. Oil circuit 2 32 located between valve 321 and flow meter 2 324 is connected to return oil branch B. Oil return branch B is connected in series with valve 4 322 and connected to return oil 2 323. When valve 3 321 is in the connected state and valve 4 322 is in the disconnected state, oil inlet B22 is in the oil inlet state, and vice versa.

[0036] In this embodiment, the opening and closing of valve 321 adjusts whether oil enters through the oil inlet B22 in oil circuit 2 32, and the opening and closing of valve 422 adjusts whether oil returns through the return branch B to the oil inlet B22. The opening and closing states of valve 321 and valve 422 are opposite to satisfy the oil inlet B22's oil entry or return. For example, when valve 321 is closed and valve 422 is open, oil inlet B22 is in the oil entry state; when valve 321 is open and valve 422 is closed, oil inlet B22 is in the oil return state.

[0037] Pressure sensor 315 is installed at oil inlet A21 to monitor the pressure at oil inlet A21, and pressure sensor 325 is installed at oil inlet B22 to monitor the pressure at oil inlet B22.

[0038] In this embodiment, pressure at oil inlet A21 and oil inlet B22 is tested using pressure sensor 315 and pressure sensor 325, ensuring that the test is conducted under the set pressure. At the same time, the sealing performance of the rotary joint 20 can be judged by monitoring the pressure and combining the leakage test value with the pressure change.

[0039] In practice, the pressure during testing usually does not change, but excessive leakage can cause pressure changes.

[0040] A filter assembly 4 and a check valve 3 are connected to the main oil circuit 1 located between pump 5 and three-way valve 2, which effectively ensures the test oil supply from oil tank 7 through pump 5 and main oil circuit 1 to rotary joint 20; a branch line connecting to oil tank 7 is connected to the side of the main oil circuit 1 located between pump 5 and filter assembly 4, and a main circuit valve 9 is connected to the branch line.

[0041] It also includes an oil cooler, and a cooling circuit 40 is connected between the oil tank 7 and the oil cooler to cool the oil in the oil tank 7; the oil tank 7 is also equipped with a thermometer 6 and a level gauge 8 to monitor the oil temperature and level in the oil tank 7 in real time.

[0042] In this embodiment, the rotary joint 20, as shown... Figure 2 As shown, the inner shaft 24 of the rotary joint 20 is rotatably mounted in the outer casing 25, and a gap sealing area is formed between the outer wall surface of the inner shaft 24 and the inner wall surface of the outer casing 25. Corresponding to the oil inlet A21 and oil inlet B22, circumferential grooves are formed along the inner shaft 24, which are connected to the holes opened in the axial direction of the inner shaft 24 through the circumferential grooves, so as to realize the actual transfer use of the rotary joint 20 in the rotating state. The outer casing 25 is also provided with an oil return port L23, which is connected to both ends of the gap sealing area. In actual use, some of the oil entering the rotary joint through the oil inlet A21 and oil inlet B22 will be collected in the gap sealing area and flow out through the oil return port L23.

[0043] The gap seal between the inner shaft 24 and the outer shell 25 in the rotary joint 20 is disassembled into three sections along the axial direction according to the positions of the oil inlet A21 and the oil inlet B22. These are the first section L1 located between the oil inlet A21 and the oil return port L23, the second section L2 located between the oil inlet A21 and the oil inlet B22, and the third section L3 located between the oil inlet B22 and the oil return port L23.

[0044] In this embodiment, two oil inlets and one oil return port on the rotary joint 20 are cleverly used to divide the gap sealing section between the inner shaft 24 and the outer shell 25 of the rotary joint 20 into three sections. Through oil circuit connection and test settings, a comprehensive leakage test of the gap sealing section can be performed, effectively ensuring the sealing performance of the rotary joint and ensuring quality.

[0045] In this embodiment, when the rotary joint 20 is installed in the test system, the end of the inner shaft 24 protruding from the outer shell 25 on the rotary joint 20 can be connected to the output end of the rotation drive power 10. At the same time, the orifice opened on the end face of the inner shaft 24 for normal use of the rotary joint 20 is closed so as to facilitate the sealing performance test of the gap sealing section through the oil inlet A21, oil inlet B22, and oil return L23.

[0046] The testing system in this embodiment can perform gap sealing performance tests on the rotary joint 20 according to actual testing needs, such as testing the three gap sealing sections located between the inner shaft 24 and the outer shell 25 in the rotary joint 20.

[0047] In practice, the following testing methods can be used: Test 1: When oil is only supplied through inlet A21, oil will be returned through inlet B22 and outlet L23 to obtain the oil supply quantity Q at inlet A21. A进 Oil return volume Q at oil inlet B22 B回 Oil return volume Q B回 Corresponding to the leakage amount Q2 on the second segment L2, the return oil amount Q at the return port L23 is... L回 Oil intake quantity Q A进 With return oil volume Q B回 The difference, return oil volume Q L回 The leakage amount Q1 corresponds to the first segment L1; Test 2: When oil is only supplied through inlet B22, oil will be returned through inlet A21 and outlet L23 to obtain the oil supply quantity Q at inlet B22. B进 Oil return volume Q at oil inlet A21 A回 Oil return volume Q A回 Corresponding to the leakage amount Q2 on the second segment L2, the return oil amount Q at the return port L23 is... L回 Oil intake quantity Q B进 With return oil volume Q A回 The difference, return oil volume Q L回 The leakage amount Q3 corresponds to the third segment L3; Test 3: When oil is flowing into both inlet A21 and inlet B22, oil will return from outlet L23; obtain the oil flow rate Q at inlet A21. A进 Oil inlet quantity Q at inlet B22 B进 Then the oil return volume Q at return port L23 L回 Oil intake quantity Q A进 With oil intake Q B进 The sum of the oil return volume Q L回 The leakage amount Q corresponds to the first segment L1 and the third segment L3. 1+3 ; The leakage amounts in Test 1 (Q1), Test 2 (Q3), and Test 3 (Q) will be tested. 1+3 Compare each value with a preset value. If all values ​​are less than the preset value, and the sum of the leakage amounts Q1 and Q3 is less than the leakage amount Q... 1+3 If the results are close to the original, the test is passed; otherwise, the test is failed.

[0048] In practice, the order of Test 1, Test 2, and Test 3 is not restricted. After each test, the leakage amount can be compared and judged.

[0049] In practice, the same duration can be set for each test, including Test 1, Test 2, and Test 3. Repeated tests can also be performed to obtain multiple sets of values ​​to ensure the accuracy and reliability of the test.

[0050] Of course, in actual testing, other test settings can also be implemented according to testing requirements.

[0051] In actual operation, static or dynamic tests can be performed depending on whether the inner shaft 24 rotates relative to the outer casing 25; when performing dynamic tests, different speeds can be set for testing.

[0052] In actual testing, the test pressure and test temperature are usually set, for example, the test is conducted at the working pressure and working temperature of the rotary joint 20.

[0053] For the rotary joint 20, in practical use, it is applied to an external object by connecting oil inlet A21 and oil inlet B22 to the pipelines supplying oil to and from the external object, forming a circulating oil circuit connected to the external object. In this embodiment, for testing purposes, the two oil inlets are used as oil inlet / return ports.

[0054] This invention enables the testing of the gap sealing performance of rotary joints, which greatly helps to ensure the gap sealing performance of rotary joints and the quality of rotary joints. It is easy to operate and reliable to test.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0056] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A rotary joint testing system, wherein the rotary joint (20) comprises an inner shaft (24) and a housing (25) fitted with a clearance, and the housing (25) is provided with an oil inlet A (21), an oil inlet B (22), and an oil return port L (23), characterized in that: The test system includes a test oil circuit (30), which includes a main oil circuit (1) connected to the oil tank (7) via a pump (5). The main oil circuit (1) is connected to oil circuit one (31) and oil circuit two (32) via a three-way valve (2). Oil circuit one (31) is connected to the oil inlet A (21), and oil circuit one (31) is laterally connected to the return oil branch A. Oil circuit two (32) is connected to the oil inlet B (22), and oil circuit two (32) is laterally connected to the return oil branch B. It also includes a return oil branch C connected to the return oil inlet L (23).

2. The rotary joint testing system as described in claim 1, characterized in that: The first oil circuit (31) is equipped with a flow meter (314) to measure the oil inlet or return flow of the oil inlet A (21); the second oil circuit (32) is equipped with a flow meter (324) to measure the oil inlet or return flow of the oil inlet B (22); when in the oil inlet state, the corresponding flow meter measures the oil inlet flow, and when in the oil return state, the corresponding flow meter measures the oil return flow, which is the leakage amount at the corresponding oil inlet.

3. The rotary joint testing system as described in claim 1, characterized in that: The return port L (23) is in the return state; both the inlet port A (21) and the inlet port B (22) are in the inlet state, or one is in the inlet state and the other is in the return state.

4. The rotary joint testing system as described in claim 1, characterized in that: The rotary joint (20) is supported and fixed on the external platform by the outer shell (25). The end of the inner shaft (24) is connected to the rotation drive power (10). The rotation drive power (10) drives the inner shaft (24) to rotate relative to the outer shell (25). Combined with the oil inlet A (21) and oil inlet B (22) oil inlet settings, the sealing performance of the gap between the outer shell (25) and the inner shaft (24) is dynamically tested.

5. The rotary joint testing system as described in claim 1, characterized in that: The first oil circuit (31) is connected in series with the first valve (311) and the first flow meter (314) and connected to the oil inlet A (21). The first oil circuit (31) located between the first valve (311) and the first flow meter (314) is connected to the return oil branch A. The return oil branch A is connected in series with the second valve (313) and connected to the return oil first (312). When the first valve (311) is in the connected state and the second valve (313) is in the disconnected state, the oil inlet A (21) is in the oil inlet state. Otherwise, the oil inlet A (21) is in the oil return state.

6. The rotary joint testing system as described in claim 1, characterized in that: The oil circuit 2 (32) is connected in series with valve 3 (321) and flow meter 2 (324) and connected to oil inlet B (22). The oil circuit 2 (32) located between valve 3 (321) and flow meter 2 (324) is connected to return oil branch B. Valve 4 (322) is connected in series with return oil branch B and connected to return oil 2 (323). When valve 3 (321) is in the connected state and valve 4 (322) is in the disconnected state, oil inlet B (22) is in the oil inlet state. Otherwise, oil inlet B (22) is in the oil return state.

7. The rotary joint testing system as described in claim 1, characterized in that: A pressure sensor 1 (315) is installed at the oil inlet A (21) to monitor the pressure at the oil inlet A (21), and a pressure sensor 2 (325) is installed at the oil inlet B (22) to monitor the pressure at the oil inlet B (22).

8. The rotary joint testing system as described in claim 1, characterized in that: A filter assembly (4) and a check valve (3) are connected to the main oil circuit (1) between the pump (5) and the three-way valve (2); a branch line connecting to the oil tank (7) is connected to the main oil circuit (1) between the pump (5) and the filter assembly (4), and a main circuit valve (9) is connected to the branch line.

9. The rotary joint testing system as described in claim 1, characterized in that: It also includes an oil cooler, and a cooling circuit (40) is connected between the oil tank (7) and the oil cooler to cool the oil in the oil tank (7); the oil tank (7) is also equipped with a thermometer (6) and a level gauge (8) to monitor the oil temperature and level in the oil tank (7) in real time.

10. The rotary joint testing system as described in claim 1, characterized in that: The gap seal between the inner shaft (24) and the outer shell (25) of the rotary joint (20) is disassembled into three sections along the axial direction according to the positions of the oil inlet A (21) and the oil inlet B (22). The sections are: the first section (L1) between the oil inlet A (21) and the oil return L (23), the second section (L2) between the oil inlet A (21) and the oil inlet B (22), and the third section (L3) between the oil inlet B (22) and the oil return L (23).

Images