Polygonal disc-shaped off-circuit tap switch

Abstract

The utility model relates to a multilateral disc-shaped off-circuit tap-changer which is structurally characterized in that three-phase fixed contacts are respectively fixed on a multilateral disc-shaped switch seat, and three-phase moving contacts are respectively fixed on a left rack, a right rack and a lower rack of the transmission mechanism and are respectively in sliding elastic contact with the three-phase fixed contacts of the corresponding phase; the lower end face of the polygonal disc-shaped switch base is designed to be a concave cavity, the periphery of the polygonal disc-shaped switch base is a polygon formed by three protruding cuboids and a plurality of protruding ribs, and rectangular grooves are formed in the top faces of the concave cavities on the inner sides of one adjacent cuboid and another non-adjacent cuboid respectively in parallel. Three bosses with threaded holes are arranged at the corresponding positions of the top face of the concave cavity, a protruding circular tube is arranged at the corresponding position of the plane of the upper end of the polygonal disc-shaped switch base, and an inner hole of the circular tube is communicated with the concave cavity at the lower end of the polygonal disc-shaped switch base. The switch has the advantages of being high in mechanical strength, stable in electrical performance and high in universality and interchangeability, saving tapping leads, insulating pieces and clamping pieces, and reducing the manufacturing cost of the transformer.

Description

Technical Field:

[0001] The utility model relates to a multi-sided disc-shaped non-excitation tap-changer, which is applied to a three-dimensional wound-core oil-immersed distribution transformer. Background Art:

[0002] In the distribution transformer industry in China, the coil distribution of three-phase power transformers has two forms: one is planar distribution, that is, the coils of phases A, B, and C are in the same plane; the other is three-dimensional distribution, and the coils of phases A, B, and C are respectively distributed in three planes that are 60 degrees apart from each other, and its top view is approximately an equilateral triangle. This type of transformer is called a three-dimensional wound-core transformer, commonly known as a triangular transformer. Triangular transformers account for a certain proportion in the market. Currently, the non-excitation tap-changers used in triangular transformers are circular disc switches and strip switches.

[0003] Among them, the circular disc switch has the following defects:

[0004] 1. Since the three-phase lead terminals of the circular disc switch are evenly distributed along the circumference in three equal parts, they do not correspond to the lead distribution positions of the triangular transformer. It is not convenient for lead connection, increasing the lead length; and the tap lead of one phase coincides with the low-voltage lead part of the transformer, increasing the insulation treatment cost and lead cost.

[0005] 2. The parts of the circular disc switch have no universality and interchangeability with the parts of switches of other structural forms. It increases the production flow cost and brings inconvenience to organizing production.

[0006] 3. The connection method between the fixed contact of the circular disc switch and the transformer tap lead is only the bolt connection method of the terminal, without the copper tube cold pressing connection method, which cannot meet the diverse needs of users.

[0007] The strip switch has the following defects:

[0008] 1. The strip switch is of a traditional structural form, composed of many parts, with poor mechanical and electrical performance stability of the product; the production cost is high.

[0009] 2. It has a large volume and is not convenient to use in small-capacity transformers. Summary of the Invention:

[0010] The purpose of the utility model is to provide a multi-sided disc-shaped non-excitation tap-changer in order to overcome the defects existing in the circular disc-shaped non-excitation tap-changer and the strip-shaped non-excitation tap-changer.

[0011] A multilateral disc-shaped non-excitation tap-changer is composed of a multilateral disc-shaped switch base, a transmission mechanism, three-phase fixed contacts, and three-phase moving contacts. Its characteristics are as follows: The transmission mechanism and the three-phase fixed contacts are respectively fixed on the multilateral disc-shaped switch base. The three-phase moving contacts are respectively fixed on the left rack, right rack, and lower rack of the transmission mechanism and are in sliding elastic contact with the three-phase fixed contacts of the corresponding phases.

[0012] The lower end face of the multilateral disc-shaped switch base is designed as a concave cavity. The periphery is composed of three raised cuboids and multiple raised ribs to form a polyhedron. And on the top surface of the concave cavity inside each of the adjacent cuboid and another non-adjacent cuboid, a rectangular groove is arranged in parallel. At the corresponding position on the top surface of the concave cavity, three bosses with threaded holes are provided. At the corresponding position on the upper plane of the multilateral disc-shaped switch base, a raised circular tube is provided, and the inner hole of the circular tube communicates with the lower concave cavity.

[0013] The transmission mechanism is a gear-rack mechanism, which is composed of a gear shaft, a left rack, a right rack, a lower rack, a chute cover, and a pressing plate. The left rack and the lower rack are respectively installed in the two rectangular grooves on the top surface of the concave cavity of the multilateral disc-shaped switch base. The chute cover is installed on the boss on the top surface of the concave cavity of the multilateral disc-shaped switch base. The chute cover restricts the movement of the gear shaft, the left rack, and the lower rack. There is a raised straight rib on the chute cover, and the groove of the right rack is in matching sliding fit with a raised straight rib provided on the chute cover. The pressing plate is fixed on the chute cover, and the pressing plate restricts the movement of the right rack. The gear shaft is installed on the circular tube of the multilateral disc-shaped switch base and is inserted into the lower concave cavity through the inner hole of the circular tube, so that the gear shaft meshes with the left rack, the right rack, and the lower rack at the same time.

[0014] The multilateral disc-shaped switch base is of injection molding structure or compression molding structure.

[0015] The fixing method of the three-phase fixed contacts is terminal fixing method or copper tube cold pressing connection method.

[0016] The fixing method of the three-phase fixed contacts is terminal fixing method. And for the three raised cuboids correspondingly arranged on the multilateral disc-shaped switch base, on each cuboid, four square grooves are arranged in parallel for a three-step switch or six square grooves are arranged for a five-step switch. The width and depth of each groove respectively match the width and thickness of the terminal fixed contacts. A blind hole or an insert nut is arranged in the middle of each groove, and a U-shaped groove is arranged between two adjacent square grooves.

[0017] The fixing method of the three-phase fixed contacts is copper tube cold pressing connection method. And for the three raised cuboids correspondingly arranged on the multilateral disc-shaped switch base, on each cuboid, four circular through holes are arranged in parallel for a three-step switch or six circular through holes are arranged in parallel for a five-step switch. The diameter of each circular through hole matches the outer diameter of the copper tube cold pressing fixed contacts. A U-shaped groove is arranged between two adjacent through holes.

[0018] The left rack, right rack, lower rack, and gear shaft are all integral structural parts formed by injection molding or compression molding.

[0019] The left rack and the right rack are both in the shape of an inclined T. Two grooves are symmetrically arranged along the thickness direction on one side of the inclined T shape. A through hole is arranged at the symmetrical part of the two grooves. A three-phase moving contact corresponding to each groove is installed in each groove. On the other side of the inclined T shape of the left rack, straight teeth matching the tooth shape of the gear shaft are arranged in the vertical length direction and the geometric dimensions match and slide fit with a groove correspondingly arranged on the multi-sided disc-shaped switch base. On the other side of the inclined T shape of the right rack, a groove and straight teeth matching the tooth shape of the gear shaft are respectively arranged in parallel along the length direction.

[0020] The lower rack is in the shape of a regular T. Two grooves are symmetrically arranged along the thickness direction on one side of the T shape. A through hole is arranged at the symmetrical part of the two grooves. A three-phase moving contact corresponding to each groove is installed in each groove. On the other side of the T shape, straight teeth matching the tooth shape of the gear shaft are arranged in the vertical length direction and the geometric dimensions match and slide fit with a groove correspondingly arranged on the multi-sided disc-shaped switch base.

[0021] Among the three-phase fixed contacts, one phase of the fixed contact is directly fixed in a straight line distribution on one side of the multi-sided disc-shaped switch base; the other two phases of the fixed contacts are respectively directly fixed on the other two adjacent sides of the multi-sided disc-shaped switch base.

[0022] The utility model has the following characteristics:

[0023] 1. The multi-sided disc-shaped switch base of the utility model is formed by injection molding or compression molding, with high mechanical strength and stable electrical performance;

[0024] 2. The components of the switch of the utility model have strong generality and interchangeability with the components of the sector switches that the company has mass-produced, reducing the production flow cost and facilitating the organization of production.

[0025] 3. There are two ways to connect the fixed contact of the switch of the utility model with the tap lead of the triangular transformer: the connection method of terminal bolts and the cold pressing connection method of copper tubes, which meet the different needs of users and can reduce the procurement cost of users at the same time.

[0026] 4. The distribution of the three-phase fixed contacts of the switch of the utility model corresponds to the distribution position of the three-phase leads of the triangular transformer, saving tap leads, insulating parts and clamping parts, and reducing the manufacturing cost of the transformer.

[0027] Therefore, the utility model completely overcomes the defects of the existing circular disc switches and strip switches, and is a transformer tap switch with high cost performance, which is worthy of promotion. Brief description of the drawings:

[0028] Figure 1It is the bottom-up view of the forward cold pressing connection of the present utility model.

[0029] Figure 2 It is the front view of the forward cold pressing connection of the present utility model.

[0030] Figure 3 It is the top view of the forward cold pressing connection of the present utility model.

[0031] Figure 4 It is the bottom-up view of the reverse cold pressing connection of the present utility model.

[0032] Figure 5 It is the front view of the reverse cold pressing connection of the present utility model.

[0033] Figure 6 It is the top view of the reverse cold pressing connection of the present utility model.

[0034] Figure 7 It is the bottom-up view of the forward wiring terminal connection of the present utility model.

[0035] Figure 8 It is the front view of the forward wiring terminal connection of the present utility model.

[0036] Figure 9 It is the top view of the forward wiring terminal connection of the present utility model.

[0037] Figure 10 It is the bottom-up view of the reverse wiring terminal connection of the present utility model.

[0038] Figure 11 It is the front view of the reverse wiring terminal connection of the present utility model.

[0039] Figure 12 It is the top view of the reverse wiring terminal connection of the present utility model.

[0040] Figure 13 It is the bottom-up view of the multi-sided disc-shaped switch base of the present utility model.

[0041] Figure 14 It is Figure 13 the A-A cross-sectional view of.

[0042] Figure 15 It is Figure 13 the B-B cross-sectional view of.

[0043] Figure 16 It is Figure 13 the C-C cross-sectional view of.

[0044] Figure 17 It is the top view of the multi-sided disc-shaped switch base of the present utility model.

[0045] Figure 18 It is Figure 17D-D sectional view.

[0046] In the attached drawings: 1 - three-phase fixed contact, 2 - three-phase moving contact, 3 - left rack, 4 - right rack, 5 - chute cover, 6 - pressing plate, 7 - gear shaft, 8 - lower rack, 9 - multi-sided disc-shaped switch base, 10 - transmission mechanism. Specific implementation manner:

[0047] The present utility model will be further described in conjunction with the attached drawings.

[0048] As Figures 1-12 shown, a multi-sided disc-shaped non-excitation tap-changer is composed of a multi-sided disc-shaped switch base 9, a transmission mechanism 10, a three-phase fixed contact 1, and a three-phase moving contact 2; characterized in that: the transmission mechanism 10 and the three-phase fixed contact 1 are respectively fixed on the multi-sided disc-shaped switch base 9, and the three-phase moving contacts 2 are respectively fixed on the left rack 3, the right rack 4, and the lower rack 8 of the transmission mechanism 10 and are respectively in sliding elastic contact with the three-phase fixed contacts 1 of the corresponding phases; the three-phase moving contacts 2 are respectively constrained in the corresponding parts of the left rack 3, the right rack 4, and the lower rack 8 of the three single phases corresponding to the three-phase fixed contacts 1.

[0049] As Figures 13-18 shown, the lower end surface of the multi-sided disc-shaped switch base 9 is designed as a concave cavity, and the periphery is composed of three convex cuboids and multiple convex ribs to form a multi-sided body, and a rectangular groove is respectively and parallelly arranged on the top surface of the concave cavity inside each of the adjacent cuboid and another non-adjacent cuboid for installing the sliding left rack 3 and the lower rack 8, and three convex platforms with threaded holes are arranged at the corresponding positions on the top surface of the concave cavity for installing the chute cover 5, and a convex circular tube is arranged at the corresponding position on the upper plane of the multi-sided disc-shaped switch base 9, and the inner hole of the circular tube communicates with the lower concave cavity, which is convenient for installing the transmission mechanism 10.

[0050] The transmission mechanism 10 is a gear-rack mechanism and is composed of a gear shaft 7, a left rack 3, a right rack 4, a lower rack 8, a chute cover 5, and a pressing plate 6; the left rack 3 and the lower rack 8 are respectively installed in the two rectangular grooves on the top surface of the concave cavity of the multi-sided disc-shaped switch base 9, the chute cover 5 is installed on the convex platform on the top surface of the concave cavity of the multi-sided disc-shaped switch base 9, and the chute cover restricts the movement of the gear shaft, the left rack, and the lower rack; a convex straight rib is arranged on the chute cover 5, and the groove on the right rack 4 is in sliding fit with a convex straight rib arranged on the chute cover 5; the pressing plate 6 is fixed on the chute cover 5, and the pressing plate 6 restricts the movement of the right rack 4, the gear shaft 7 is installed on the circular tube of the multi-sided disc-shaped switch base 9 and is inserted into the lower concave cavity through the inner hole of the circular tube, so that the gear shaft 7 meshes with the left rack 3, the right rack 4, and the lower rack 8 at the same time. Among them, the left rack 3 and the lower rack 8 are installed and restricted in the two rectangular grooves arranged on the multi-sided disc-shaped switch base 9; the right rack 4 is restricted on a convex straight rib arranged on the chute cover 5.

[0051] Three fixing holes are provided on the described chute cover 5 and are fixedly matched with three corresponding bosses provided with threaded holes on the multi-sided disc-shaped switch base 9. It is used to restrict the movement of the left rack 3, the lower rack 8 and the gear shaft 7. A raised straight rib is provided at the corresponding position on the chute cover 5 and is slidably matched with the straight groove provided on the right rack 4. Two bosses with threaded holes are provided on one side of the raised straight rib of the chute cover 5 for fixing the pressing plate 6, and the pressing plate 6 is used to restrict the movement of the right rack 4.

[0052] The described gear shaft 7 is installed in the vertical center hole of the multi-sided disc-shaped switch base 9. And it meshes with the left rack 3, the right rack 4 and the lower rack 8 at the same time, forming a gear-rack transmission mechanism.

[0053] The described multi-sided disc-shaped switch base 9 is an injection molding structure or a compression molding structure.

[0054] The fixing method of the three-phase fixed contact is the wiring terminal fixing method or the copper tube cold pressing connection method.

[0055] Among the described three-phase fixed contacts 1, one-phase fixed contact is directly linearly distributed and fixed on one side of the multi-sided disc-shaped base 9; the other two-phase fixed contacts are respectively directly fixed on the other two adjacent sides of the multi-sided disc-shaped switch base.

[0056] The fixing method of the three-phase fixed contact 1 is the wiring terminal fixing method, as Figures 7-12 shown, and three raised cuboids are correspondingly arranged on the multi-sided disc-shaped switch base 9. Four square grooves are arranged for the three-position switch or six square grooves are arranged for the five-position switch on each cuboid. The width and depth of each groove respectively match the width and thickness of the wiring terminal fixed contact; a blind hole or an insert nut is provided in the middle of each groove for assembling self-tapping screws or screw-fixed wire terminals fixed contacts. A U-shaped groove is provided between two adjacent square grooves for increasing the creepage distance.

[0057] The fixing method of the three-phase fixed contact 1 is the copper tube cold pressing connection method, as Figures 1-6As shown, the polygonal disc switch seat 9 has three protruding rectangular parallelepiped bodies arranged in parallel, and four circular through holes are arranged in parallel on each rectangular parallelepiped for a three-speed switch or six circular through holes are arranged in parallel on a five-speed switch, and the aperture of each circular through hole matches the outer diameter of the copper tube cold-pressed fixed contact; a U-shaped groove is arranged between two adjacent through holes to increase the creepage distance. The copper tube cold-pressed fixed contact is made of a section of red copper tube, and the method of fixing it on the polygonal disc switch seat 9 is as follows: after inserting the copper tube cold-pressed fixed contact with a groove pressed along the diameter direction of the copper tube (and the length of the groove is greater than the diameter of the copper tube) at one end into the fixing hole of the polygonal disc switch seat 9, the copper tube cold-pressed fixed contact is pressed with another groove in the diameter direction against the outer wall of the fixing hole of the polygonal disc switch seat 9, so that the length of the groove is greater than the diameter of the copper tube. The copper tube cold-pressed fixed contact is fixed and constrained on the polygonal disc switch seat 9 by means of the inner and outer double grooves being larger on both sides and smaller in the middle.

[0058] The left rack 3, the right rack 4, the lower rack 8 and the gear shaft 7 are all integral structural parts formed by injection molding or compression molding.

[0059] The left rack 3 and the right rack 4 are both in an oblique T shape, and two grooves are symmetrically arranged along the thickness direction on one side of the oblique T shape, and a through hole is arranged at the symmetrical position of the two grooves, and a three-phase moving contact 2 of the corresponding phase is installed in each groove, and a straight tooth matching the tooth shape of the gear shaft 7 is arranged in the vertical length direction on the other side of the oblique T shape of the left rack 3, and the geometric size matches and slides with a groove corresponding to the gear shaft 7 on the polygonal disc switch seat 9, and a groove and a straight tooth matching the tooth shape of the gear shaft 7 are arranged in parallel along the length direction on the other side of the oblique T shape of the right rack 4. The lower rack 8 is in a regular T shape, and two grooves are symmetrically arranged along the thickness direction on one side of the T shape, and a through hole is arranged at the symmetrical position of the two grooves, and a three-phase moving contact 2 of the corresponding phase is installed in each groove, and a straight tooth matching the tooth shape of the gear shaft 7 is arranged in the vertical length direction on the other side of the T shape, and the geometric size matches and slides with a groove corresponding to the polygonal disc switch seat 9. The three-phase moving contacts 2 are six in total, with two contacts for each phase, which are respectively constrained in the grooves corresponding to the left rack 3, the right rack 4, and the lower rack 8.

[0060] Among the three-phase fixed contacts, one phase fixed contact is directly distributed in a straight line. Fix On one side of the polygonal disk-shaped switch seat 9; the other two phase fixed contacts are directly fixed on the other two adjacent sides of the polygonal disk-shaped switch seat 9.

[0061] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A multi-sided disc-shaped non-excitation tap changer, which is composed of a multi-sided disc-shaped switch base, a transmission mechanism, three-phase fixed contacts, and three-phase moving contacts; characterized in that: The described transmission mechanism and three-phase fixed contacts are respectively fixed on the polygonal disc-shaped switch base, and the three-phase moving contacts are respectively fixed on the left rack, right rack and lower rack of the transmission mechanism and are respectively in sliding Elasticity contact with the three-phase fixed contacts of the corresponding phases; The lower end face of the multi-sided disc-shaped switch base is designed as a concave cavity, and the periphery is composed of three raised cuboids and multiple raised ribs to form a polyhedron. On the top surface of the concave cavity inside the adjacent cuboid and another non-adjacent cuboid, a rectangular groove is arranged in parallel respectively. At the corresponding position on the top surface of the concave cavity, three bosses with threaded holes are arranged. At the corresponding position on the upper plane of the multi-sided disc-shaped switch base, a raised circular tube is arranged, and the inner hole of the circular tube communicates with the lower concave cavity.

2. The multi-sided disc type non-excitation tap-changer according to claim 1, characterized in that: The transmission mechanism is a gear-rack mechanism, which is composed of a gear shaft, a left rack, a right rack, a lower rack, a chute cover and a pressing plate. The left rack and the lower rack are respectively installed in the two rectangular grooves on the top surface of the concave cavity of the multi-sided disc-shaped switch base. The chute cover is installed on the boss on the top surface of the concave cavity of the multi-sided disc-shaped switch base. The chute cover restricts the movement of the gear shaft, the left rack and the lower rack. There is a raised straight rib on the chute cover, and the groove of the right rack is in sliding fit with a raised straight rib arranged on the chute cover. The pressing plate is fixed on the chute cover, and the pressing plate restricts the movement of the right rack. The gear shaft is installed on the circular tube of the multi-sided disc-shaped switch base and is inserted into the lower concave cavity through the inner hole of the circular tube, so that the gear shaft meshes with the left rack, the right rack and the lower rack at the same time.

3. The multi-sided disc type non-excitation tap-changer according to claim 1 or 2, characterized in that: The multi-sided disc-shaped switch base is an injection molding structure or a compression molding structure.

4. The multi-sided disc type non-excitation tap-changer according to claim 3, characterized in that: The fixing method of the three-phase fixed contact is a wiring terminal fixing method or a copper tube cold pressing connection method.

5. The multi-sided disc type non-excitation tap-changer according to claim 4, characterized in that: The fixing method of the three-phase fixed contact is a wiring terminal fixing method. And for the three raised cuboids correspondingly arranged on the multi-sided disc-shaped switch base, four square grooves are arranged for a three-position switch on each cuboid or six square grooves are arranged for a five-position switch. The width and depth of each groove respectively match the width and thickness of the wiring terminal fixed contact. A blind hole or an insert nut is arranged in the middle of each groove.

6. The multi-sided disc type non-excitation tap-changer according to claim 4, characterized in that: The fixing method of the three-phase fixed contact is a copper tube cold pressing connection method. And for the three raised cuboids correspondingly arranged on the multi-sided disc-shaped switch base, four circular through holes are arranged in parallel for a three-position switch on each cuboid or six circular through holes are arranged in parallel for a five-position switch. The diameter of each circular through hole matches the outer diameter of the copper tube cold pressing fixed contact.

7. The multi-sided disc type non-excitation tap-changer according to claim 2, characterized in that: The left rack, the right rack, the lower rack and the gear shaft are all integral structural parts formed by injection molding or compression molding.

8. The multi-sided disc type non-excitation tap-changer according to claim 7, characterized in that: Both the left rack and the right rack are in an oblique T shape. Two grooves are symmetrically arranged along the thickness direction on one side of the oblique T shape. A through hole is arranged at the symmetric position of the two grooves. One three-phase moving contact of the corresponding phase is installed in each groove. On the other side of the oblique T shape of the left rack, straight teeth matching the tooth shape of the gear shaft are arranged in the vertical length direction and the geometric dimensions are in sliding fit with a groove correspondingly arranged on the multi-sided disc-shaped switch base. On the other side of the oblique T shape of the right rack, a groove and straight teeth matching the tooth shape of the gear shaft are respectively arranged in parallel along the length direction.

9. The multi-sided disc type non-excitation tap-changer according to claim 7, characterized in that: The lower rack is in a regular T shape. Two grooves are symmetrically arranged along the thickness direction on one side of the T shape. A through hole is arranged at the symmetric position of the two grooves. One three-phase moving contact of the corresponding phase is installed in each groove. On the other side of the T shape, straight teeth matching the tooth shape of the gear shaft are arranged in the vertical length direction and the geometric dimensions are in sliding fit with a groove correspondingly arranged on the polygonal disc-shaped switch base.

10. The multi-sided disc type non-excitation tap-changer according to claim 1, characterized in that: Among the described three-phase fixed contacts, one-phase fixed contact is directly distributed linearly and fixed on one side of the polygonal disc-shaped switch base; the other two-phase fixed contacts are respectively directly fixed on the other two adjacent sides of the polygonal disc-shaped switch base.

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