Moving contact structure of frame switch
By setting up a storage space and insulating parts between the arc contact and the main contact, the problem of the frame switch failing to pass through the critical current at high voltage and breaking down the main arc contact is solved, and the high voltage breaking capability is improved.
Patent Information
- Application Number
- CN202422414990.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The dynamic contact structure of the existing frame switch cannot effectively withstand current at high voltage, resulting in the failure of critical current, breakdown of the main arc contact and arcing current of the main contact are too large, which cannot meet the standard requirements of DC2500V.
A receiving space is provided between the arc contact and the main contact, and an insulator is inserted therein. The support rod and the insulator move relative to each other during the on- and disconnection process, increasing the current-carrying area and isolating the arc contact and main contact, reducing the arcing current.
The critical current is increased to prevent the main arc contact from being broken down, and the arcing current of the main contact is reduced, thereby achieving the breaking capability of high voltage in small-voltage products.
Smart Images
Figure CN223218152U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of circuit breakers, and in particular relates to a moving contact structure of a frame switch. Background Art
[0002] In the current low-voltage electrical appliance sector, DC switches can only withstand voltages up to DC1500V. To meet the latest developments in the low-voltage electrical appliance industry, DC switches are required to withstand currents and voltages up to AC2000V and DC3000V. Current products only support DC750V for a single pole and DC1500V for two poles, with no products on the market meeting the DC2500V standard. Traditionally, DC1500V products typically use a 4P resistor, but these are bulky and expensive. To reduce costs, 2P / DC1500V and 2P / DC2000V products have emerged on the market. However, these 2P / DC1500V and 2P / DC2000V products must withstand higher voltages per resistor. Consequently, when extinguishing an arc, the high voltage across each individual pole makes it difficult to extinguish the arc, leading to insulation failure. In the prior art, the contacts of the frame switch can be fully parallel multi-piece contacts or a set of main arc contacts, and the arc contacts are used to extinguish the arc. Figure 1 As shown in the figure, the main contact has a main contact, and the arc contact has a main contact and an arc contact. The main contact and the arc contact are generally arranged in an array with the same gap. When this traditional moving contact is used in high voltage products, the following problems will occur:
[0003] (1) Critical current does not pass;
[0004] (2) Main arc contact breakdown;
[0005] (3) The arcing current of the main contact is too large. Utility Model Content
[0006] The present utility model aims to solve the problems existing in the movable contacts of the above-mentioned existing frame switches when used in high-voltage products, and provides a movable contact structure of a frame switch. By improving the existing movable contact structure, the critical current is increased, the main arc contact is prevented from being broken down, and the arc starting current of the main contact is reduced.
[0007] Technical Solution
[0008] In order to achieve the above technical objectives, the utility model provides a moving contact structure of a frame switch, which includes an arc contact 1 and a main contact 2, and the main contact 2 is arranged side by side on both sides of the arc contact 1. It is characterized in that: there are accommodating spaces a, a' between the two sides of the arc contact 1 and the main contact 2, and the insulating member 4 is inserted in the accommodating spaces a, a' to isolate the arc contact 1 and the main contact 2. A support rod 3 is arranged in the area below the accommodating space a, a' corresponding to the rod portion 201 of the main contact 2. During the connection and disconnection process of the frame switch, the support rod 3 and the insulating member 4 have relative movement.
[0009] In one embodiment, the accommodating spaces a, a′ are limited to a region corresponding to the contact portion 2 a of the main contact 2 .
[0010] In one embodiment, the insulating member 4 is fixedly mounted on the static contact 6 .
[0011] In one embodiment, the support rod 3 is arranged parallel to and alongside the arcing contact 1 and the main contact 2 .
[0012] In one embodiment, the contact part 2a of the main contact 2 is arranged with a main silver point 2a01, and the contact part 1a of the arc contact 1 is arranged with an arc silver point 1a01. The part of the insulating member 4 inserted in the accommodating space a, a' extends through the main silver point 2a01 to isolate the arc contact 1 and the main contact 2.
[0013] In one embodiment, no silver dots are arranged in the area on the arcing contact 1 corresponding to the accommodating spaces a, a′.
[0014] In one embodiment, a main silver point 2a01 is arranged in the area of the contact part 2a of the main contact 2 corresponding to the accommodating space a, a′.
[0015] In one embodiment, the accommodating space a, a′ is equal to the width of a contact piece of at least one main contact 2 .
[0016] In one embodiment, the length of the arcing contact 1 is longer than the length of the main contact 2 .
[0017] In one embodiment, the gas generating member 5 is mounted on the arc extinguishing grid corresponding to the main contact 2 to form a narrow gap d, and the arc silver point 1a01 moves in the narrow gap d.
[0018] Beneficial effects
[0019] The utility model provides a movable contact structure for a frame switch, comprising an arcing contact 1 and a main contact 2, the main contact 2 being arranged side by side on either side of the arcing contact 1. The utility model is characterized by accommodation spaces a and a' being provided between the arcing contact 1 and the main contact 2, and insulating members 4 being inserted into the accommodation spaces a and a' to isolate the arcing contact 1 from the main contact 2. By improving upon the existing movable contact structure, the accommodation spaces a and a' are provided between the arcing contact 1 and the main contact 2, thereby increasing the critical current, preventing breakdown of the main arcing contact, and reducing the arcing current of the main contact. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0021] Attachment Figure 1 This is a schematic diagram of the structure of the main contact and arc contact in the prior art;
[0022] Attachment Figure 2a This is a schematic diagram of the structure of the main contacts and arc contacts in an embodiment of the present utility model;
[0023] Attachment Figure 2b This is a schematic diagram of the position structure of the moving contact and the static contact in the embodiment of the utility model;
[0024] Attachment Figure 3 This is a schematic diagram of a narrow slit in an embodiment of the present utility model;
[0025] Attachment Figure 4 This is a schematic diagram of the installation of the insulating member and the moving contact in the embodiment of the utility model;
[0026] Attachment Figure 5 This is a schematic diagram comparing the timing of the embodiment of the utility model with the prior art; DETAILED DESCRIPTION
[0027] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0028] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.
[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.
[0030] In this application, unless otherwise expressly specified or limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or that the first feature and the second feature are indirectly in contact through an intermediate medium. Furthermore, a first feature being “above,” “above,” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below,” “below,” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0031] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.
[0032] Example
[0033] like Figure 1 As shown in the figure, the main contact has a main contact, and the arc contact has a main contact and an arc contact. The main contact and the arc contact are generally arranged in an array with the same gap. When this traditional moving contact is used in high voltage products, problems such as critical current not passing, main arc contact breakdown, and excessive arcing current of the main contact may occur. In order to solve this problem, as shown in the attached figure, Figure 2a and 2bAs shown, this embodiment provides a movable contact structure for a frame switch, comprising an arcing contact 1 and a main contact 2. The main contacts 2 are arranged side by side on either side of the arcing contact 1. In this embodiment, there are two arcing contacts 1. Accommodation spaces a and a' are located between the arcing contact 1 and the main contacts 2. Insulators 4 are inserted into the accommodating spaces a and a' to isolate the arcing contact 1 from the main contacts 2. In this embodiment, the insulators 4 are preferably fixedly mounted on the stationary contacts 6.
[0034] The length of the arc contact 1 is longer than that of the main contact 1. Figure 3 As shown, the gas generating member 5 is mounted on the arc quenching grid corresponding to the main contact 2 to form a narrow gap d. The arc silver point 1a01 of the arc contact 1 moves in the narrow gap d, which is conducive to the passage of critical current. At the same time, the smaller the narrow gap, the better the effect.
[0035] As shown in FIG2 , the accommodating spaces a and a' are limited to the area corresponding to the contact portion 2a of the main contact 2. A support rod 3 is arranged below the accommodating spaces a and a' in the area corresponding to the rod portion 201 of the main contact 2. During the connection and disconnection of the frame switch, the support rod 3 and the insulating member 4 move relative to each other.
[0036] The support rod 3 is a metal piece, made of copper, the same material as the main contact 2. The support rod 3 is preferably in contact with the adjacent arcing contact 1 and / or main contact 2, which can increase the current carrying area and reduce the temperature rise of the moving contact structure.
[0037] The support rod 3 is arranged parallel to and alongside the arcing contact 1 and the main contact 2. A main silver point 2a01 is located in the area of the contact portion 2a of the main contact 2 corresponding to the accommodation spaces a and a'. An arc silver point 1a01 is located in the contact portion 1a of the arcing contact 1. The portion of the insulating member 4 inserted into the accommodation spaces a and a' extends past the main silver point 2a01, isolating the arcing contact 1 from the main contact 2. Even without a silver point located in the area of the arcing contact 1 corresponding to the accommodation spaces a and a', the timing difference of the arcing contacts can be improved.
[0038] Specifically, as shown in FIG2 , the existing arcing contact has a main contact, but in this embodiment, the arcing contact has no main contact.
[0039] As attached Figure 5 As shown by sequence number 1, it is the closed state, and there is no difference between the existing technology and this embodiment.
[0040] At sequence number 2, the arcing contact 1 is in the just-opened state. The arcing contact 1 provided in this embodiment no longer has a main contact, so there is no arc on the arcing contact 1. However, in the arcing contact of the prior art, when it is just opened, the main contact on the arcing contact still has a certain residual current I', that is, the arcing contact has an arc.
[0041] At sequence number 3, the main contacts are already open, and there is no difference. However, because arcing contact 1 in this embodiment is freed from the influence of main contact 1b earlier, the timing difference is greater (i.e., the time difference between the arcing contact and the main contact is greater in this embodiment). For example, the timing difference is reduced from 1.5ms to 3ms. This small difference can minimize the current on main contact 2, thus minimizing arcing and concentrating the arc primarily on arcing contact 1. Furthermore, eliminating the silver dots in the area of arcing contact 1 can also improve the timing difference of the arcing contacts.
[0042] As attached Figure 4 As shown, the accommodation spaces a and a' correspond to the contact blade width of at least one main contact 2. An insulator 4 is inserted into the accommodation space 1 to isolate the arcing contact 1 from the main contact 2. The isolating feature 4a of the insulator 4 separates the arcing contact from the main contact. This allows high-voltage disconnection to be achieved in a compact design, even without requiring a large contact spacing or insulation distance.
[0043] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0044] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.
Claims
1. A movable contact structure of a frame switch, comprising an arcing contact (1) and a main contact (2), wherein the main contact (2) is arranged side by side on both sides of the arcing contact (1), characterized in that: There are accommodating spaces (a, a') between the two sides of the arcing contact (1) and the main contact (2); an insulating member (4) is inserted into the accommodating spaces (a, a') to isolate the arcing contact (1) and the main contact (2); a support rod (3) is arranged below the accommodating spaces (a, a') in an area corresponding to the rod portion (201) of the main contact (2); and during the connection and disconnection process of the frame switch, the support rod (3) and the insulating member (4) move relative to each other.
2. The movable contact structure of a frame switch according to claim 1, characterized in that: The accommodating space (a, a') is limited to a region corresponding to the contact portion (2a) of the main contact (2).
3. The movable contact structure of a frame switch according to claim 1, characterized in that: The insulating member (4) is fixedly mounted on the static contact (6).
4. The movable contact structure of a frame switch according to claim 1, characterized in that: The support rod (3) is arranged parallel to and alongside the arc contact (1) and the main contact (2).
5. The movable contact structure of a frame switch according to claim 1, characterized in that: The contact portion (2a) of the main contact (2) is provided with a main silver point (2a01), and the contact portion (1a) of the arc contact (1) is provided with an arc silver point (1a01); the portion of the insulating member (4) inserted into the accommodating space (a, a') extends through the main silver point (2a01), isolating the arc contact (1) from the main contact (2).
6. The movable contact structure of a frame switch according to claim 1, characterized in that: The area on the arc contact (1) corresponding to the accommodating space (a, a') is not arranged with silver dots.
7. The movable contact structure of a frame switch according to claim 1, characterized in that: A main silver point (2a01) is arranged in an area of the contact portion (2a) of the main contact (2) corresponding to the accommodation space (a, a').
8. The movable contact structure of a frame switch according to claim 1, characterized in that: The accommodating space (a, a') is the width of a contact piece of at least one main contact (2).
9. The movable contact structure of a frame switch according to claim 1, characterized in that: The length of the arcing contact (1) is longer than the length of the main contact (2).
10. The movable contact structure of a frame switch according to claim 1, characterized in that: The gas generating member (5) is mounted on the arc extinguishing grid corresponding to the main contact (2) to form a narrow gap (d), and the arc silver point (1a01) moves at the narrow gap (d).