A pipeline pressure difference regulating device used in flexible low-frequency power transmission system

Abstract

The present invention relates to a pipeline pressure difference regulating device applied to a flexible low-frequency power transmission system, comprising a confluence water pipe, a pre-tightening nut, a branch pipe joint and a sealing member, wherein a branch pipe joint is installed at the branch pipe of the confluence water pipe, and an outer wall of the branch pipe joint is provided with an outer edge with a width matching the outer diameter of the confluence water pipe, the pre-tightening nut is sleeved on the connection between the branch pipe of the confluence water pipe and the branch pipe joint, and a sealing member is provided at the connection between the branch pipe joint and the branch pipe of the confluence water pipe and the pre-tightening nut; a branch pipe joint connected to one end of the branch pipe of the confluence water pipe is provided with a water inlet pipe which is inclined at an angle to the confluence water pipe, and the branch pipe joint can rotate along the central axis of the branch pipe on the confluence water pipe, and the rotation of the branch pipe joint drives the inclined water inlet pipe to change the angle of the water flow direction of the confluence water pipe; the present invention adjusts the waterway pressure difference by adjusting the angle between the confluence water pipe and the water inlet pipe of the branch pipe joint, and is not easy to be blocked, has low vibration and noise, and has a compact structure.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible low-frequency power transmission systems, and in particular to a pipeline pressure difference regulating device applied to flexible low-frequency power transmission systems. Background Art

[0002] The flexible low-frequency AC power transmission system is composed of multiple power electronic power modules. Whether the cooling water flow of a single power module meets the design requirements will directly affect the junction temperature of the power electronic devices and the robustness of the entire transmission system. The cooling water flow of a single power module is affected by the size and layout of the system pipelines and the differences in the internal pipelines of each power module. In order to ensure that the cooling water of each power module meets the rated flow and the flow difference between each power module is small, the conventional method is to adjust the length of the branch pipeline, add regulating valves and throttles to match the flow and pressure difference; however, the above-mentioned method of adjusting the length of the branch pipeline has the disadvantages of large size and difficulty in layout, and the method of adding valves and throttles has the disadvantages of increasing flow noise and being easily blocked by impurities in the water system. In order to avoid the above problems, there is an urgent need for a pipeline pressure difference flow regulating device that meets the characteristics of high reliability, compactness and easy operation. Summary of the invention

[0003] The present invention provides a pipeline pressure difference regulating device applied to a flexible low-frequency power transmission system, which adjusts the waterway pressure difference by adjusting the angle between a converging water pipe and a water inlet pipe of a branch pipe joint, is not easy to be clogged, has low vibration and noise, and has a compact structure.

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

[0005] A pipeline pressure difference regulating device applied to a flexible low-frequency power transmission system comprises a converging water pipe, a pre-tightening nut, a branch pipe joint and a sealing member, wherein the branch pipe joint is installed at the branch pipe of the converging water pipe, the outer wall of the branch pipe joint is provided with an outer edge whose width matches the outer diameter of the converging water pipe, the pre-tightening nut is sleeved at the connection between the branch pipe of the converging water pipe and the branch pipe joint, the connection between the branch pipe joint and the branch pipe of the converging water pipe is provided with a sealing member, and the connection between the branch pipe joint and the pre-tightening nut is provided with a sealing member;

[0006] A branch pipe joint connected to one end of the branch pipe of the confluence water pipe is provided with a water inlet pipe which is inclined at an angle to the confluence water pipe, and the other end of the branch pipe joint is provided with a water outlet pipe which is perpendicular to the confluence water pipe, and the diameters of the water inlet pipe and the water outlet pipe are smaller than the diameter of the branch pipe of the confluence water pipe. The branch pipe joint can rotate along the central axis of the branch pipe on the confluence water pipe, and the rotation of the branch pipe joint drives the angle of the water flow direction of the inclined water inlet pipe and the confluence water pipe to change.

[0007] Furthermore, the sealing member includes a pre-compression washer, a sliding washer and a sealing ring. The sealing ring is arranged at the circumferential connection between the branch pipe joint and the branch pipe wall of the converging water pipe. The sliding washer is arranged at the connection between the outer edge of the branch pipe joint and the branch pipe of the converging water pipe. The pre-compression washer is arranged between the upper surface of the outer edge of the branch pipe joint and the pre-compression nut.

[0008] Furthermore, the water inlet pipe inclined with respect to the confluence water pipe has an inclination angle of 45° to 135° relative to the water flow direction in the confluence water pipe.

[0009] Furthermore, the outer wall of the branch pipe of the converging water pipe is provided with an external thread, and the pre-tightening nut is provided with an internal thread matching the external thread of the branch pipe of the converging water pipe.

[0010] Furthermore, a graduated dial is provided on the upper surface of the pre-tightening nut, and a pointer which rotates synchronously with the branch pipe joint is provided on the upper surface of the branch pipe joint. The pointer and the graduated dial are matched to display and indicate the pressure difference gear position.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1) Compared with the conventional pipeline pressure difference regulating device, the technical solution provided by the present invention does not use a valve or throttle to adjust the pressure difference by adopting a local necking method, nor does it use a method of changing the length of the pipeline to adjust the pressure difference. Instead, it uses a method of adjusting the angle between the confluence water pipe and the water inlet pipe of the branch pipe joint to adjust the waterway pressure difference. The overall structure has the characteristics of not being easy to be blocked, low vibration and noise, and compact structure;

[0013] 2) Double circumferential sealing rings are used between the confluence water pipe and the branch pipe joint. The branch pipe joint as a whole can rotate along the central axis of the confluence pipe branch joint. The adopted sealing method greatly improves the reliability of the device;

[0014] 3) A pre-load washer with a certain elasticity is installed between the pre-load nut and the branch pipe joint. The compression amount of the pre-load washer can be adjusted according to the project needs, and then the rotation damping of the device can be adjusted, which is easy to operate and can prevent misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of the top view of the structure of the device of the present invention.

[0017] Figure 3 It is a schematic diagram showing the minimum angle between the water inlet pipe of the branch pipe joint of the present invention and the water flow direction in the converging water pipe.

[0018] Figure 4It is a schematic diagram of the dividing plate when the water inlet pipe of the branch pipe joint of the present invention forms a minimum angle with the water flow direction in the converging water pipe.

[0019] Figure 5 It is a schematic diagram of the case where the water inlet pipe of the branch pipe joint of the present invention forms a maximum angle with the water flow direction in the converging water pipe.

[0020] Figure 6 It is a schematic diagram of the dividing plate when the water inlet pipe of the branch pipe joint of the present invention forms a maximum angle with the water flow direction in the converging water pipe.

[0021] In the figure: 1. Converging water pipe 2. Pre-tightening nut 3. Branch pipe joint 4. Pre-tightening washer 5. Sliding washer 6. Sealing ring 7. Indexing plate 8. Pointer DETAILED DESCRIPTION

[0022] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0023] See Figure 1 , is a schematic diagram of the structure of the present invention. The present invention is a pipeline pressure difference regulating device applied to a flexible low-frequency power transmission system, comprising a confluence water pipe 1, a pre-tightening nut 2, a branch pipe joint 3, a pre-tightening washer 4, a sliding washer 5 and a sealing ring 6. The branch pipe joint 3 is installed at the branch pipe of the confluence water pipe 1, and the outer wall of the branch pipe joint 3 is provided with an outer edge whose width matches the outer diameter of the confluence water pipe 1. The pre-tightening nut 2 is sleeved at the connection between the branch pipe of the confluence water pipe 1 and the branch pipe joint 3. The pre-tightening nut 2 fixes the branch pipe joint 3 at the pipe joint of the confluence water pipe 1. The outer wall of the branch pipe joint 3 is provided with an outer edge, and a sliding washer 5 is installed between the outer edge and the branch pipe of the confluence water pipe 1. The pre-tightening nut 2 is sleeved on the upper surface of the outer edge of the branch pipe joint 3 and the outer wall of the branch pipe of the confluence water pipe 1 through a pre-tightening washer 4 with a certain elasticity. The deformation of the pre-tightening spring can be controlled by adjusting the stroke of the pre-tightening nut 2, thereby adjusting the rotation damping of the branch pipe joint 3;

[0024] The outer wall of the branch pipe of the converging water pipe 1 is provided with an external thread, and the pre-tightening nut 2 is provided with an internal thread matching the external thread of the branch pipe of the converging water pipe 1; the connection between the branch pipe joint 3 and the wall of the branch pipe of the converging water pipe 1 is sealed by two sealing rings 6 in the circumferential direction, and a sliding washer 5 is provided at the connection between the lower surface of the outer edge of the branch pipe joint 3 and the branch pipe of the converging water pipe 1, and the sliding washer 5 can reduce unnecessary rotational friction torque and reduce the wear of the converging water pipe 1 and the branch pipe joint 3 during the rotation process, and a pre-tightening washer 4 is provided between the upper surface of the outer edge of the branch pipe joint 3 and the pre-tightening nut 2;

[0025] The branch pipe joint 3 connected to one end of the branch pipe of the confluence water pipe 1 is provided with a water inlet pipe which is inclined at an angle to the confluence water pipe 1, and the other end of the branch pipe joint 3 is provided with a water outlet pipe which is perpendicular to the confluence water pipe 1, and the diameters of the water inlet pipe and the water outlet pipe are smaller than the diameter of the branch pipe of the confluence water pipe 1, and the branch pipe joint 3 can rotate along the central axis of the branch pipe on the confluence water pipe, and the rotation of the branch pipe joint 3 drives the inclined water inlet pipe and the water flow direction of the confluence water pipe 1 to change the angle.

[0026] The water inlet pipe inclined with respect to the converging water pipe 1 has an inclination angle θ of 45° to 135° relative to the water flow direction in the converging water pipe 1 .

[0027] See Figure 2 The upper surface of the pre-tightening nut 2 is provided with an average indexing plate 7 with 9 gears, and the upper surface of the branch pipe joint 3 is provided with a pointer 8 that rotates synchronously with the branch pipe joint 3. The pointer 8 and the indexing plate 7 are matched and used to display the pressure difference gear.

[0028] See Figure 3-4 The minimum angle θ1=45° is between the water inlet pipe of the branch pipe joint 3 and the water flow direction in the confluence water pipe 1, and the pointer 8 points to the 01 gear position of the dividing plate 7. At this time, the pipeline pressure difference regulating device is in the lowest flow resistance state.

[0029] See Figure 5-6 The water inlet pipe of the branch pipe joint 3 and the water flow direction in the confluence water pipe 1 form a maximum angle θ2=135°, and the pointer 8 points to the 09 gear position of the dividing plate 7. At this time, the pipeline pressure difference regulating device is in the highest flow resistance state.

[0030] By rotating the branch pipe joint 3 to adjust the angle between the water inlet pipe of the branch pipe joint 3 and the water flow direction in the converging water pipe 1, the water inlet flow resistance of the water inlet pipe of the branch pipe joint 3 is adjusted, thereby achieving the adjustment of the pipeline load flow and pressure difference.

[0031] The above embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the following embodiments are conventional methods unless otherwise specified.

Claims

1. A pipeline pressure difference regulating device applied to a flexible low-frequency power transmission system, characterized in that: It comprises a converging water pipe, a pre-tightening nut, a branch pipe joint and a sealing member, wherein the branch pipe joint is installed at the branch pipe of the converging water pipe, the outer wall of the branch pipe joint is provided with an outer edge whose width matches the outer diameter of the converging water pipe, the pre-tightening nut is sleeved at the connection between the branch pipe of the converging water pipe and the branch pipe joint, the connection between the branch pipe joint and the branch pipe of the converging water pipe is provided with a sealing member, and the connection between the branch pipe joint and the pre-tightening nut is provided with a sealing member; A branch pipe joint connected to one end of the branch pipe of the confluence water pipe is provided with a water inlet pipe which is inclined at an angle to the confluence water pipe, and the other end of the branch pipe joint is provided with a water outlet pipe which is perpendicular to the confluence water pipe, and the diameters of the water inlet pipe and the water outlet pipe are smaller than the diameter of the branch pipe of the confluence water pipe. The branch pipe joint can rotate along the central axis of the branch pipe on the confluence water pipe, and the rotation of the branch pipe joint drives the angle of the water flow direction of the inclined water inlet pipe and the confluence water pipe to change.

2. A pipeline pressure difference regulating device for a flexible low-frequency power transmission system according to claim 1, characterized in that: The sealing member comprises a pre-compression washer, a sliding washer and a sealing ring. The sealing ring is arranged at the circumferential connection between the branch pipe joint and the branch pipe wall of the converging water pipe. The sliding washer is arranged at the connection between the outer edge of the branch pipe joint and the branch pipe of the converging water pipe. The pre-compression washer is arranged between the upper surface of the outer edge of the branch pipe joint and the pre-compression nut.

3. The pipeline pressure difference regulating device for a flexible low-frequency power transmission system according to claim 1, characterized in that: The water inlet pipe inclined with respect to the converging water pipe has an inclination angle of 45° to 135° relative to the water flow direction in the converging water pipe.

4. The pipeline pressure difference regulating device for a flexible low-frequency power transmission system according to claim 1, characterized in that: The outer wall of the branch pipe of the converging water pipe is provided with an external thread, and the pre-tightening nut is provided with an internal thread matching the external thread of the branch pipe of the converging water pipe.

5. The pipeline pressure difference regulating device for a flexible low-frequency power transmission system according to claim 1, characterized in that: The upper surface of the pre-tightening nut is provided with a graduated indexing plate, and the upper surface of the branch pipe joint is provided with a pointer that rotates synchronously with the branch pipe joint. The pointer and the indexing plate are matched and used to display and indicate the pressure difference gear position.

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