Isolation knife switch of vacuum circuit breaker

Abstract

The utility model relates to an isolation switch of a vacuum circuit breaker, which comprises two switch blades, the outer sides of the front ends of the two switch blades are respectively provided with a reinforcing clamping plate, the front ends of the reinforcing clamping plates protrude out of the front ends of the switch blades, and the rear ends of the two reinforcing clamping plates are provided with first bolt pairs penetrating through the two switch blades in a penetrating manner. A first spring is arranged on a first bolt of the first bolt pair in a penetrating mode, a second bolt pair is arranged at the front ends of the two reinforcing clamping plates in a penetrating mode, and a second spring is arranged on a second bolt of the second bolt pair in a penetrating mode. According to the isolating knife switch of the vacuum circuit breaker, the balance of clamping force in front of and behind the contact point of the knife switch and the static contact is enhanced through the effect of the reinforcing clamping plate, so that the knife switch and the static contact are more stably kept to be jointed, and the performance requirement of dynamic thermal stability of the vacuum circuit breaker is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum circuit breaker technical field, especially a kind of isolation knife switch of vacuum circuit breaker. BACKGROUND

[0002] Vacuum circuit breaker is the device for switching circuit in electrical system, and the isolation knife switch in it is connected or separated with static contact through rotation to realize the closing or opening of isolating switch, in prior art, for example, utility model patent: a kind of outdoor vacuum circuit breaker isolator (publication number: CN207338216U) discloses a kind of vacuum circuit breaker isolator with isolation knife switch, the two blades of isolation knife switch in above-mentioned structure are connected to static contact by the spring on the bolt of the bolt on the front end and the spring threaded on the bolt, to ensure that blade and static contact are stably connected, but the isolation knife switch of above-mentioned structure, since the front end of blade is open, the front end of copper blade will be deformed when being subjected to electric heat impact, and the stability of blade and static contact is affected, even lead to the phenomenon that blade and static contact are disconnected, cannot satisfy the performance requirement of dynamic thermal stability of vacuum circuit breaker well.

[0003] In view of the above problems, the utility model is improved. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of isolation knife switch of vacuum circuit breaker, solve the above-mentioned problems existing in the use process of prior art.

[0005] The technical scheme of the utility model is as follows:

[0006] A kind of isolation knife switch of vacuum circuit breaker, including two blades, the front end outside of two pieces of the blade is provided with a piece of reinforcing clamping plate, the front end of the reinforcing clamping plate protrudes from the front end of blade, the rear end of two pieces of the reinforcing clamping plate is threaded with the first bolt of the first bolt through two blades, the first bolt of the first bolt is threaded with the first spring, the front end of two pieces of the reinforcing clamping plate is threaded with the second bolt, the second bolt of the second bolt is threaded with the second spring.

[0007] Preferably, the reinforcing clamping plate is made of stainless steel material.

[0008] Preferably, the first bolt of the first bolt is threaded with the first limiting sleeve between two blades.

[0009] Preferably, the second bolt of the second bolt is threaded with the second limiting sleeve between two reinforcing clamping plates.

[0010] Preferably, the reinforcing clamping plate is outwardly bent on the upper and lower sides, so that the reinforcing clamping plate is in the form of U-shaped plate.

[0011] Preferably, two first limiting tubes and two second limiting tubes are respectively arranged on the first bolt and the second bolt of the first bolt pair and the second bolt pair, and the first spring and the second spring are respectively arranged in the two first limiting tubes and the two second limiting tubes.

[0012] Preferably, a contact protrusion in a round rectangle shape is arranged on the inner side of the front end of the shutter.

[0013] In conclusion, the utility model has the advantages that the shutter front end is provided with clamping force by the reinforcing clamping plate, the balance of the clamping force before and after the contact point of the shutter and the static contact is strengthened, the deformation of the shutter front end caused by the electric heat impact is prevented, the shutter and the static contact are prevented from being separated, the shutter and the static contact are stably kept in engagement, and the performance requirement of the dynamic heat stability of the shutter and the static contact in engagement is met. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by the ordinary skilled in the art without creative labor.

[0015] Fig. 1 It is a structural schematic diagram of the utility model;

[0016] Fig. 2 It is an exploded schematic diagram of the utility model;

[0017] Fig. 3 It is a partial sectional schematic diagram of the utility model.

[0018] In the drawing: 1, shutter; 11, contact protrusion; 2, reinforcing clamping plate; 3, first bolt pair; 31, first bolt; 32, first nut; 4, first spring; 5, second bolt pair; 51, second bolt; 52, second nut; 6, second spring; 7, first limiting sleeve; 8, second limiting sleeve; 9, first limiting tube; 10, second limiting tube. DETAILED DESCRIPTION

[0019] The drawings in the embodiments of the utility model will be combined below Figs. 1-3 The technical scheme in the embodiments of the utility model is clearly and completely described, obviously, the described embodiments are only some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0020] As shown in the figure, the isolation knife switch of a vacuum circuit breaker comprises two pieces of knife 1, each of which is provided with a reinforcing clamp plate 2 at the outside of the front end and between the two bending parts at the upper and lower ends of the knife 1, the front end of the reinforcing clamp plate 2 protrudes from the front end of the knife 1, the rear end of the reinforcing clamp plate 2 is provided with a first bolt 3 passing through the two pieces of knife 1, the first bolt 31 of the first bolt 3 is provided with a first spring 4, the front end of the reinforcing clamp plate 2 is provided with a second bolt 5, the second bolt 51 of the second bolt 5 is provided with a second spring 6, the first bolt 31 of the first bolt 3 passes through the reinforcing clamp plate 2, the two pieces of knife 1 and the other reinforcing clamp plate 2 in turn, and is screwed with the first nut 32 of the first bolt 3, the second bolt 51 of the second bolt 5 passes through the two reinforcing clamp plates 2 in turn and is screwed with the second nut 52 of the second bolt 5, the reinforcing clamp plate 2 is fixedly connected to the knife 1 through the cooperation of the first bolt 3 and the two bending parts at the upper and lower ends of the knife 1, and the two pieces of knife 1 are clamped by the first spring 4, the two reinforcing clamp plates 2 are fixed by the second bolt 51, and the two reinforcing clamp plates 2 are clamped by the second spring 6.

[0021] Preferably, the reinforcing clamp plate 2 is made of stainless steel.

[0022] In the above structure, when the static contact of the vacuum circuit breaker is engaged with the knife 1 by rotating the knife 1, the static contact slightly pushes the two pieces of knife 1 and the two reinforcing clamp plates 2 and compresses the first spring 4 and the second spring 6 by abutting against the inner sides of the two pieces of knife 1, so that the static contact is inserted between the two pieces of knife 1, the inner sides of the knife 1 are kept in abutment with the static contact by the clamping force of the first spring 4, and the open front ends of the two pieces of knife 1 are clamped by the clamping force of the second spring 6, which strengthens the balance of the clamping force before and after the contact point of the knife 1 and the static contact, prevents the front end of the knife 1 from deforming when subjected to electric heat impact, prevents the knife 1 from being disengaged from the static contact, and keeps the knife 1 and the static contact stably engaged, which meets the performance requirements of the vacuum circuit breaker for the dynamic and thermal stability of the engagement between the knife 1 and the static contact. According to the characteristics of stainless steel, the reinforcing clamp plate 2 has high strength, stably clamps the front end of the knife 1, ensures the dynamic and thermal stability of the engagement between the isolation knife switch and the static contact, and is consistent with the appearance of the stainless steel shell of the vacuum circuit breaker, so that the vacuum circuit breaker has better aesthetics.

[0023] In addition, the first bolt 31 of the first bolt 3 is provided with a first limiting sleeve 7 between the two pieces of knife 1, which limits the distance between the two pieces of knife 1 when the first spring 4 clamps the two pieces of knife 1, matches the distance between the two pieces of knife 1 with the static contact, keeps the engagement between the knife 1 and the static contact stable, and facilitates the insertion of the static contact between the two pieces of knife 1.

[0024] In addition, the second bolt 51 of the second bolt pair 5 is provided with a second limiting sleeve 8 between the two reinforcing clamping plates 2, and the second limiting sleeve 8 limits the distance between the two reinforcing clamping plates 2 when the second spring 6 applies the clamping force to the two reinforcing clamping plates 2, so that the clamping force applied to the front end of the two contact blades 1 by the reinforcing clamping plates 2 is balanced with the clamping force applied to the two contact blades 1 by the first spring 4, and the dynamic thermal stability when the contact blade is combined with the static contact is ensured.

[0025] In addition, the upper and lower side segments of the reinforcing clamping plate 2 are outwardly bent to form a U-shaped plate, so that the reinforcing clamping plate 2 has higher bending strength and can apply stable clamping force to the front end of the contact blade 1.

[0026] In addition, the first bolt 31 of the first bolt pair 3 and the second bolt 51 of the second bolt pair 5 are respectively provided with two first limiting tubes 9 and two second limiting tubes 10 with one end sealed and the other end open, and the two ends of the first spring 4 and the second spring 6 are respectively inserted into the two first limiting tubes 9 and the two second limiting tubes 10, so that the first spring 4 and the second spring 6 are limited by the first limiting tubes 9 and the second limiting tubes 10, respectively, to prevent the first spring 4 and the second spring 6 from being offset in the radial direction when the contact blade 1 is combined with the static contact, so that the first spring 4 and the second spring 6 can stably apply clamping force to the contact blade 1 and the reinforcing clamping plate 2, and the dynamic thermal stability when the contact blade 1 is combined with the static contact is ensured.

[0027] In addition, the front end of the contact blade 1 is formed with a contact protrusion 11 in a round rectangular shape, and the static contact is inserted between the two contact blades 1 and is in contact with the contact protrusion 11, so that the contact protrusion 11 can reduce the resistance of the static contact and the contact blade 1 when the static contact and the contact blade 1 are combined or separated, and the contact between the contact blade 1 and the static contact is more reliable.

[0028] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A disconnector switch for a vacuum circuit breaker, comprising two disconnectors (1), characterized in that: Each of the two blades (1) has a reinforcing clamp (2) on its outer front end. The front end of the reinforcing clamp (2) protrudes from the front end of the blade (1). The rear ends of the two reinforcing clamps (2) are provided with a first bolt pair (3) that passes through the two blades (1). A first spring (4) is provided on the first bolt (31) of the first bolt pair (3). The front ends of the two reinforcing clamps (2) are provided with a second bolt pair (5). A second spring (6) is provided on the second bolt (51) of the second bolt pair (5).

2. The isolating switch of the vacuum circuit breaker according to claim 1, characterized in that: The reinforcing plate (2) is made of stainless steel.

3. The isolating switch of the vacuum circuit breaker according to claim 1, characterized in that: The first bolt (31) of the first bolt assembly (3) is provided with a first limiting sleeve (7) located between the two blades (1).

4. The isolating switch of the vacuum circuit breaker according to claim 1, characterized in that: The second bolt (51) of the second bolt assembly (5) is provided with a second limiting sleeve (8) located between the two reinforcing plates (2).

5. The isolating switch of the vacuum circuit breaker according to claim 1, characterized in that: The upper and lower sections of the reinforcing clamp (2) are bent outward to make the reinforcing clamp (2) U-shaped.

6. The isolating switch of the vacuum circuit breaker according to claim 1, characterized in that: Two first limiting tubes (9) and two limiting tubes (10) with one end sealed and the openings facing each other are respectively inserted on the first bolt (31) of the first bolt set (3) and the second bolt (51) of the second bolt set (5). The two ends of the first spring (4) and the second spring (6) are respectively inserted into the two first limiting tubes (9) and the two second limiting tubes (10).

7. The isolating switch of the vacuum circuit breaker according to claim 1, characterized in that: The inner side of the front end of the guillotine (1) has a rounded rectangular contact protrusion (11).

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