Transformer butterfly valve

Abstract

The utility model provides a butterfly valve of a transformer. The transformer butterfly valve comprises a valve body, a main shaft, an auxiliary shaft and a butterfly plate, the auxiliary shaft is located on the axis H of a valve port, the main shaft is located beside the auxiliary shaft, the auxiliary shaft is connected to the main shaft, the butterfly plate is installed on the auxiliary shaft, and the main shaft is used for driving the auxiliary shaft to rotate so that the butterfly plate can form a closing position or an opening position; a first conical surface is arranged on the side, close to the face A, of the valve port, an opening, close to the face A, of the first conical surface is smaller than an opening, close to the face B, of the first conical surface, a second conical surface matched with the first conical surface is arranged on the outer circle face of the butterfly plate, the second conical surface of the butterfly plate is attached to the first conical surface in the closing position, and the second conical surface of the butterfly plate is attached to the first conical surface in the opening position. And the second conical surface of the butterfly plate is separated from the first conical surface. The butterfly plate and the valve port are sealed through a conical surface, and meanwhile, under the action of medium pressure, the attached sealing surfaces of the butterfly plate and the valve port are tighter, and reliable sealing is formed.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to a transformer butterfly valve. Background Art

[0002] The butterfly valve used in the transformer is a valve for the oil pipeline of the oil-immersed motor transformer. It is usually installed between the transformer oil tank and the radiator. When the transformer completes the factory test and needs to be transported to the user, in order to avoid damage during transportation, the transformer butterfly valve connecting the cooler and the transformer oil tank is completely closed first, and then the cooler is disassembled. After the butterfly valve is closed, it is necessary to ensure that the transformer oil in the oil tank will not leak after the cooler is removed, and there will be no large amount of transformer oil leakage when the cooler is installed again and the butterfly valve is opened. Therefore, the sealing requirements of the butterfly valve are relatively high.

[0003] There are two main types of transformer butterfly valves. Figure 1 The plate-type hard-sealed transformer-specific butterfly valve shown in the figure is Figure 2 The soft-seal transformer-specific butterfly valve shown.

[0004] like Figure 1 As shown, the butterfly valve is a centerline structure, and the middle of its main shaft 2 is slotted, and a butterfly plate is installed in the slot and fixed by rivets or bolts. When the main shaft 2 (valve stem) rotates to drive the butterfly plate 4 to rotate, the butterfly plate 4 and the inner wall of the valve port 101 are tightly fitted to form a seal. However, there is no seal at C where the main shaft 2 and the butterfly plate 4 are connected, and there is no seal at the connection D between the main shaft 2 and the valve body 1, which may cause leakage (i.e. oil leakage), causing the transformer oil to seep out from C and / or D. In addition, the butterfly plate 4 and the inner wall surface of the valve port 101 are in plane contact, and it is easy for the butterfly plate 4 to get stuck when it rotates, causing the main shaft 2 to have excessive torque, which may easily cause the butterfly plate 4 and / or the main shaft 2 to deform.

[0005] like Figure 2 As shown, the main shaft 2 of the butterfly valve adopts an eccentric structure, and a rubber sealing ring 17 is provided on the outer circumferential surface of the butterfly plate 4, and the sealing ring 17 is tightly fitted with the inner wall of the valve port 101. The temperature of the transformer oil is relatively high during operation, and the transformer oil contains some chemical substances. The sealing ring 17 immersed in the transformer oil with high temperature and chemical substances for a long time will accelerate aging and lose its elasticity, causing the seal to fail. Once the seal fails, a large amount of transformer oil will be sprayed out when the cooler is disassembled, which not only causes environmental pollution, but also requires the oil in the transformer oil tank to be pumped out and the valve to be replaced, which increases the workload of the transformer maintenance unit and causes the power user to be unable to use electricity for a long time. Utility Model Content

[0006] The utility model aims to provide a transformer butterfly valve which can improve the sealing performance of the butterfly valve.

[0007] The technical solution of the utility model is: a transformer butterfly valve, comprising a valve body with a valve port, a main shaft, a shaft and a butterfly plate installed on the valve body, the valve body having an A surface and a B surface arranged oppositely, the secondary shaft being located on the axial center line H of the valve port, the main shaft being located beside the secondary shaft, the secondary shaft being connected to the main shaft, the butterfly plate being installed on the secondary shaft, the main shaft being used to drive the secondary shaft to rotate so that the butterfly plate forms a closed position or an open position; a first conical surface is provided on a side of the valve port close to the A surface, an opening of the first conical surface close to the A surface is smaller than an opening close to the B surface, a second conical surface matched with the first conical surface is provided on the outer circumferential surface of the butterfly plate, in the closed position, the second conical surface of the butterfly plate is fitted with the first conical surface, and in the open position, the second conical surface of the butterfly plate is separated from the first conical surface.

[0008] In the above scheme, the butterfly plate and the valve port are sealed by the conical surface, and at the same time, under the action of the medium pressure, the two are made to fit the sealing surface more closely to form a reliable seal.

[0009] Preferably, a torsion spring is mounted on the secondary shaft, and the torsion spring abuts against the butterfly plate and the main shaft respectively.

[0010] Preferably, the main shaft includes a first shaft body, a second shaft body and a third shaft body which are connected in sequence, the secondary shaft is connected to the third shaft body, one end of the valve body is provided with an inner hole communicating with the valve port, and the other end is provided with a blind hole communicating with the valve port, the third shaft body is sleeved with a first seal, the second shaft body is assembled in the inner hole of the valve body through the second seal, the first seal also abuts against the second shaft body and the bottom of the inner hole at the same time, the first shaft body is fixed to the valve body through a cover cap, and the third shaft body is rotatably arranged in the blind hole away from the end of the first shaft body.

[0011] Preferably, the secondary shaft is connected to the primary shaft via a connecting hinge, a first spring is sleeved on the second shaft body, and the first spring abuts against the connecting hinge and the first sealing member respectively.

[0012] Preferably, the first sealing member comprises a flat washer, a gasket and a sealing ring which are arranged in sequence, the sealing ring is in a C-shape bent toward the gasket, and the sealing ring abuts against the bottom of the second shaft body and the inner hole of the valve body at the same time.

[0013] Preferably, a breakaway opening is provided on the ring segment of the gasket, and the breakaway opening enables the gasket to expand adaptively.

[0014] Preferably, the second seal comprises a main shaft seal and a threaded pressure ring mounted on the second shaft body, the first shaft body is mounted with a limit plate abutting against the threaded pressure ring, the limit plate is located in the valve body, and the cover cap abuts against the outer surface of the limit plate.

[0015] Preferably, the cover cap is fixed to the outer surface of the valve body through a pressing plate, and an anti-loosening plate is installed on the cover cap.

[0016] Preferably, the first shaft is a square shaft, the pressure plate is fixed to the valve body by a first bolt, the anti-loosening plate is sleeved on the cover cap, and an anti-loosening mechanism is connected between the anti-loosening plate and the pressure plate.

[0017] Preferably, a third conical surface connected to the second conical surface is further provided on the outer circumferential surface of the butterfly plate, and the inclination direction of the third conical surface is opposite to that of the second conical surface.

[0018] Compared with the related art, the beneficial effects of the utility model are:

[0019] 1. The butterfly plate and the valve port are sealed by the conical surface. At the same time, under the action of the medium pressure F, the two fit the sealing surface more closely to form a reliable seal;

[0020] Second, the butterfly plate and the valve port are sealed by a conical surface, and the second conical surface on the butterfly plate and the first conical surface on the valve port are concentric circles, which can reduce the friction between the butterfly plate and the inner wall of the valve port, thereby reducing the torque of the main shaft (low torque), avoiding the butterfly plate from getting stuck when rotating, and achieving smooth closing or opening of the butterfly plate;

[0021] 3. A first sealing member is added between the main shaft and the valve body, and the first sealing member is always in contact with the second shaft body and the bottom of the inner hole to prevent transformer oil from leaking from between the main shaft and the valve body, thereby achieving zero leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an existing plate-type hard-sealed transformer-specific butterfly valve;

[0023] Figure 2 It is a structural schematic diagram of an existing butterfly valve for soft-seal transformers;

[0024] Figure 3 A schematic diagram of the structure of a transformer butterfly valve provided by the utility model;

[0025] Figure 4 For along Figure 3 A cross-sectional schematic diagram of EE in FIG.

[0026] Figure 5 for Figure 4 The enlarged schematic diagram of K in FIG.

[0027] Figure 6 is a schematic diagram of the structure of the gasket;

[0028] Figure 7 For along Figure 3 A cross-sectional view of GG in FIG. 1 and a schematic diagram showing the butterfly plate in the closed position;

[0029] Figure 8 for Figure 3 Schematic diagram of top view;

[0030] Fig. 9 This is a schematic diagram of the butterfly plate in the opening process;

[0031] Fig.10 Schematic diagram of the butterfly valve in the open position.

[0032] In the attached drawings: 1. valve body; 101. valve port; 1011. first cylindrical surface; 1012. first conical surface; 1013. second cylindrical surface; 102. inner hole; 103. blind hole; 104. clamping hole; 105. fourth conical surface; 2. main shaft; 21. first shaft body; 22. second shaft body; 23. third shaft body; 3. secondary shaft; 4. butterfly plate; 41. second conical surface; 42. third conical surface; 43. connecting ear plate; 5. first sealing member; 51. flat pad; 52. gasket ; 521, disconnection port; 53, sealing ring; 6, second sealing member; 61, main shaft seal; 62, threaded pressure ring; 7, connecting hinge; 8, pin; 9, torsion spring; 10, first spring; 11, limit plate; 12, pressure plate; 13, cover cap; 14, anti-loosening plate; 15, first bolt; 16, anti-loosening mechanism; 161, first support; 162, second bolt; 163, second support; 164, third bolt; 165, second spring; 17, sealing ring. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0034] like Figure 3 As shown, a transformer butterfly valve provided in this embodiment includes a valve body 1, a main shaft 2, a secondary shaft 3, a butterfly plate 4, a first seal 5, a second seal 6, a connecting hinge 7, a pin 8, a torsion spring 9, a first spring 10, a limit plate 11, a pressure plate 12, a cover cap 13, an anti-loosening plate 14, a first bolt 15 and a second bolt 16.

[0035] like Figure 3 As shown, a cylindrical valve port 101 is provided in the middle of the valve body 1. Figure 4 As shown, the valve body 1 has an A surface and a B surface which are arranged opposite to each other. Figure 7As shown, the valve port 101 is formed with a first cylindrical surface 1011, a first conical surface 1012 and a second cylindrical surface 1013 in sequence from the A surface. The diameter of the first cylindrical surface 1011 is smaller than the diameter of the second cylindrical surface 1013, so that the opening of the first conical surface 1012 near the A surface is smaller than the opening near the B surface.

[0036] like Figure 4 As shown, one end of the valve body 1 is provided with an inner hole 102 communicating with the valve port 101, and the other end is provided with a blind hole 103 communicating with the valve port 101. The axis of the inner hole 102 coincides with the axis of the blind hole 103, so as to install the main shaft 2. Figure 7 As shown, the inner hole 102 and the blind hole 103 are eccentrically arranged.

[0037] like Figure 4 , Figure 5 As shown, a clamping hole 104 is provided at the bottom of the inner hole 102, one end of the clamping hole 104 is a non-through structure, and a fourth cone surface 105 is formed at the non-through end of the clamping hole 104. The clamping hole 104 is used to install the first sealing member 5.

[0038] like Figure 4 As shown, the main shaft 2 includes a first shaft body 21, a second shaft body 22 and a third shaft body 23 connected in sequence. The diameter of the third shaft body 23 is smaller than the diameter of the second shaft body 22, so that a structure symmetrical to the clamping hole 104 is formed between the second shaft body 22 and the third shaft body 23 (as shown in FIG. Figure 5 As shown in FIG. 1 ), the first sealing member 5 which is sleeved on the third shaft body 23 is clamped in the symmetrical structure.

[0039] like Figure 3 , Figure 7 As shown, the secondary shaft 3 is connected to the main shaft 2 through a connecting hinge 7, so that the axis of the secondary shaft 3 coincides with the center line H of the valve body 1. The connecting hinge 7 is a large and a small ear structure, wherein the large end is sleeved on the main shaft 2 and fixed by a pin 8, and the small end is sleeved on the secondary shaft 3 and fixed by a corresponding fastener. Two connecting hinges 7 are sleeved on the third shaft body 23.

[0040] like Figure 7 As shown, the butterfly plate 4 is provided with a connecting ear plate 43 on one side close to the B surface, and the connecting ear plate 43 is sleeved on the secondary shaft 3 and limited by the pin 8. Figure 3 As shown, the secondary shaft 3 is provided with a torsion spring 9. Figure 7 As shown, the torsion spring 9 abuts against the inner surfaces of the main shaft 2 and the butterfly plate 4 respectively, so that the butterfly plate 4 is always close to the main shaft 2, can transmit better, and rotate with the main shaft 2.

[0041] like Figure 7As shown, the outer surface of the butterfly plate 4 is provided with a second conical surface 41 and a third conical surface 42, and the second conical surface 41 is adapted to the first conical surface 1012 so that the two can be in close contact. The inclination direction of the third conical surface 42 is opposite to that of the second conical surface 41, so that the butterfly plate 4 can rotate and open (such as Fig. 9 As shown), the butterfly plate 4 is prevented from excessively contacting the inner wall of the valve port 101 and getting stuck, and the butterfly plate 4 is prevented from deforming. When the butterfly plate 4 is in the closed position, the second conical surface 41 is arranged close to the A surface, and the third conical surface 42 is arranged close to the B surface.

[0042] like Figure 4 As shown, the end of the third shaft body 23 away from the second shaft body 22 is rotatably installed in the blind hole 103, and the second shaft body 22 passes through the inner hole 102 and places the first shaft body 21 outside the valve body 1. The third shaft body 23 is also sleeved with a first spring 10, and the first spring 10 is respectively in contact with the connecting hinge 7 on the adjacent side and the flat gasket 51 of the first sealing member 5.

[0043] like Figure 5 As shown, the first sealing member 5 comprises a flat washer 51, a washer 52 and a sealing ring 53 arranged in sequence. The flat washer 51 is a standard part adapted to the outer diameter of the third shaft body 23. The washer 52 and the sealing ring 53 are made of soft metal material. Figure 6 As shown, a disconnection opening 521 is provided on the ring section of the gasket 52. The sealing ring 53 is a C-shaped shape bent toward the gasket 52. The C-shaped sealing ring 53 wraps the gasket 52 therein, and the two ends of the C-shaped sealing ring 53 slightly extend outwards and are respectively arranged corresponding to the inner wall of the clamping hole 104 and the side wall of the third shaft body 23. The side of the sealing ring 53 away from the gasket 52 abuts against the fourth cone surface 105 of the clamping hole 104 and the transition cone surface of the second shaft body 22. Because there are machining errors in the transition cone surfaces of the clamping hole 104 and the second shaft body 22, in order to overcome this machining error, the first spring 10 abuts against the bottom of the flat gasket 51. Under the action of the first spring 10, the gasket 52 can move up and open to achieve self-adjustment, so that the first sealing member 5 is in full contact with the clamping hole 104 and the main shaft 2, thereby improving the sealing performance. In addition, the first sealing member 5 is made of metal to avoid the problem of easy aging of the rubber sealing ring 17. When the main shaft seal 61 made of rubber material ages and fails, the first seal 5 always maintains sealing, so that the transformer oil does not leak from the main shaft 2.

[0044] like Figure 4As shown, a second sealing member 6 is provided between the second shaft body 22 and the inner hole 102. The second sealing member 6 includes a main shaft seal 61 and a threaded pressure ring 62 which are sleeved on the second shaft body 22. The main shaft seal 61 is arranged close to the third shaft body 23. The threaded pressure ring 62 is threadedly connected to the inner hole 102 and then presses the main shaft seal 61. A limit plate 11 which abuts against the threaded pressure ring 62 is sleeved on the first shaft body 21. A sink is provided at the end of the inner hole 102 of the valve body 1, and the limit plate 11 is placed in the sink. The first shaft body 21 is a square shaft. A square hole which is adapted to the first shaft body 21 is provided inside the cover cap 13, and the outside of the cover cap 13 is a hexagon. The cover cap 13 is sleeved on the outside of the first shaft body 21, and the limit plate 11 is sleeved on the outside of the bottom of the cover cap 13.

[0045] The end of the cap 13 close to the limiting plate 11 is a stepped circle, and the inner hole of the pressure plate 12 used to be sleeved on the cap 13 is a stepped hole. The stepped circle is placed in the stepped hole to achieve axial and radial limiting of the cap 13. The pressure plate 12 is fixed to the valve body 1 by a first bolt 15 (such as Figure 8 as shown).

[0046] like Figure 4 , Figure 8 As shown, the outer part of the cover cap 13 is provided with an anti-loosening plate 14, and the anti-loosening plate 14 is placed on the outer surface of the step circle and the pressure plate 12. The anti-loosening plate 14 is provided with a hexagonal hole adapted to the cover cap 13. After the anti-loosening plate 14 is mounted on the cover cap 13, it also plays an anti-loosening role through the anti-loosening mechanism 16 connected to the pressure plate 12.

[0047] like Figure 3 , Figure 8 As shown, the anti-loosening mechanism 16 includes a first support 161, a second bolt 162, a second support 163, a third bolt 164 and a second spring 165. There are two first supports 161, which are fixed on the anti-loosening plate 14 at 90 degrees. Each first support 161 is threadedly connected with a second bolt 162. The second support 163 is installed on the pressure plate 12, and the third bolt 164 is threadedly connected with the second support 163. When the butterfly plate 4 is in the closed position, the axis center line of one of the second bolts 162 is on the same horizontal line as the axis center line of the third bolt 164 and is aligned with the length direction of the valve body 1 (i.e. Figure 8 The second spring 165 is mounted on the second bolt 162 and the third bolt 164 at the same time. Figure 8 As shown, there is a gap δ between the second screw 162 and the third bolt 164 .

[0048] When the cover cap 13 needs to be rotated clockwise, the third bolt 164 is first retracted to increase the gap δ, and then the second spring 165 is retracted to separate the second spring 165 from the second bolt 162. The cover cap 13 is rotated clockwise (together with the main shaft 3 by 90° to place the butterfly plate 4 in the open position). At this time, another second bolt 162 is rotated to the position of the original first second bolt 162, and the axis of the new second bolt 162 is on the same horizontal line as the axis of the third bolt 164 and in the length direction of the valve body 1. The third bolt 164 is screwed in to reduce the gap δ and reach a suitable value, and then the second spring 165 is reset so that the second spring 165 is simultaneously mounted on the second bolt 162 and the third bolt 164.

[0049] The main shaft 2 rotates to drive the secondary shaft 3 to rotate, so that the butterfly plate 4 forms a closed position or an open position. Figure 7 As shown, in the closed position, the second conical surface 41 of the butterfly plate 4 is in contact with the first conical surface 1012. When the main shaft 2 is rotated in the direction of Fig. 9 Rotate clockwise as shown until a Fig.10 Shown in open position.

[0050] The utility model adopts conical surface matching between the butterfly plate and the valve port to form a seal, which effectively solves the problems of butterfly plate leakage and butterfly plate sticking.

[0051] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A transformer butterfly valve, comprising a valve body with a valve port and a main shaft mounted on the valve body, wherein the valve body has an A surface and a B surface arranged opposite to each other, characterized in that: It also includes a secondary shaft and a butterfly plate, the secondary shaft is located on the axis H of the valve port, the main shaft is located beside the secondary shaft, the secondary shaft is connected to the main shaft, the butterfly plate is installed on the secondary shaft, and the main shaft is used to drive the secondary shaft to rotate so that the butterfly plate forms a closed position or an open position; a first conical surface is provided on the side of the valve port close to the A surface, the opening of the first conical surface close to the A surface is smaller than the opening close to the B surface, and a second conical surface adapted to the first conical surface is provided on the outer circumferential surface of the butterfly plate, when in the closed position, the second conical surface of the butterfly plate is in contact with the first conical surface, and when in the open position, the second conical surface of the butterfly plate is separated from the first conical surface.

2. The transformer butterfly valve according to claim 1, characterized in that: The secondary shaft is sleeved with a torsion spring, which is respectively in contact with the butterfly plate and the main shaft.

3. The transformer butterfly valve according to claim 1, characterized in that: The main shaft includes a first shaft body, a second shaft body and a third shaft body connected in sequence, the secondary shaft is connected to the third shaft body, one end of the valve body is provided with an inner hole communicating with the valve port, and the other end is provided with a blind hole communicating with the valve port, the third shaft body is sleeved with a first seal, the second shaft body is assembled in the inner hole of the valve body through the second seal, the first seal also abuts against the second shaft body and the bottom of the inner hole at the same time, the first shaft body is fixed to the valve body through a cover cap, and the third shaft body is rotatably arranged in the blind hole away from the end of the first shaft body.

4. The transformer butterfly valve according to claim 3, characterized in that: The secondary shaft is connected to the primary shaft via a connecting hinge, a first spring is sleeved on the second shaft body, and the first spring abuts against the connecting hinge and the first sealing member respectively.

5. The transformer butterfly valve according to claim 3, characterized in that: The first sealing member includes a flat washer, a gasket and a sealing ring which are arranged in sequence. The sealing ring is in a C shape which is bent toward the gasket. The sealing ring abuts against the bottom of the inner hole of the second shaft body and the valve body at the same time.

6. The transformer butterfly valve according to claim 5, characterized in that: A disconnection opening is arranged on the ring section of the gasket.

7. The transformer butterfly valve according to claim 3, characterized in that: The second sealing member includes a main shaft seal and a threaded pressure ring mounted on the second shaft body, the first shaft body is mounted with a limit plate abutting against the threaded pressure ring, the limit plate is located in the valve body, and the cover cap abuts against the outer surface of the limit plate.

8. The transformer butterfly valve according to claim 3, characterized in that: The cover cap is fixed to the outer surface of the valve body through a pressing plate, and an anti-loosening plate is installed on the cover cap.

9. The transformer butterfly valve according to claim 8, characterized in that: The first shaft body is a square shaft, the pressure plate is fixed to the valve body by a first bolt, the anti-loosening plate is sleeved on the cover cap, and an anti-loosening mechanism is connected between the anti-loosening plate and the pressure plate.

10. The transformer butterfly valve according to claim 1, characterized in that: A third conical surface connected to the second conical surface is also provided on the outer circumferential surface of the butterfly plate, and the inclination direction of the third conical surface is opposite to that of the second conical surface.

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