DC relay

Abstract

The utility model relates to a DC relay, comprising: a housing; the housing is made of ceramic material; a static contact; a part of the static contact is arranged in the housing; a bottom plate, the bottom plate is located below the static contact and the housing; a first isolation structure is arranged between the housing and the static contact. The DC relay of the present application can improve the insulation performance and pressure resistance performance of the relay system by arranging the first isolation structure, thereby ensuring the safety of the relay system during use.

Description

Technical Field

[0001] The utility model relates to the field of relays, in particular to a direct current relay. Background Art

[0002] A DC relay is an electronic control device that has a control system (also called an input circuit) and a controlled system (also called an output circuit). It is usually used in automatic control circuits. In fact, it is an "automatic switch" that uses a smaller current to control a larger current. It plays the role of automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] During the use of DC relays, foreign matter such as copper slag may splash after arc erosion, which will pollute the inner cavity of the DC relay system, causing the ceramic inner wall and plastic inner wall, which originally have strong insulation and voltage resistance, to be polluted, resulting in reduced insulation and voltage resistance between the moving contact (load high-voltage end) and the coil low-voltage end and between the positive and negative poles of the load. This increases the risk of leakage in the relay system, which may cause the relay system to fail or even cause casualties. In the prior art, a plastic frame is usually added to the cavity to isolate the splashing foreign matter generated by the arc, but the plastic frame will precipitate moisture in the ceramic cavity, causing the system loop resistance to increase and the temperature rise to be too high. In addition, the plastic has poor arc resistance and may be burned under the action of the arc. The combustion products produced will pollute the ceramic cavity, and the burned plastic will also cause a decrease in insulation performance. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, one object of the utility model is to provide a DC relay, which can improve the insulation performance and voltage resistance performance of the relay system, thereby ensuring the safety of the relay system during use.

[0006] According to a first aspect of the present utility model, a DC relay for solving the above-mentioned problem is proposed, comprising:

[0007] include:

[0008] Shell; the shell is made of ceramic material;

[0009] a stationary contact, a portion of which is disposed in the housing;

[0010] A bottom plate, the bottom plate being located below the static contact and the housing;

[0011] A first isolation structure is provided between the housing and the stationary contact.

[0012] Optionally, a second isolation structure is provided between the shell and the bottom plate, and the second isolation structure comprises a step formed by the shell protruding downward from the bottom plate.

[0013] Optionally, a first groove is provided in the housing near an outer end surface of the housing and a bottom of the housing and around a center line T of the housing.

[0014] Optionally, the stationary contact includes a first stationary contact and a second stationary contact.

[0015] Optionally, the first isolation structure comprises a plurality of second grooves arranged in the housing around the axis X of the first stationary contact.

[0016] Optionally, the first isolation structure further comprises a plurality of second grooves arranged in the housing around the axis Y of the second stationary contact.

[0017] Optionally, the first isolation structure comprises ceramic isolation ribs arranged in the housing around the axis X of the first stationary contact.

[0018] Optionally, the first isolation structure further includes ceramic isolation ribs arranged in the housing around the axis Y of the second static contact.

[0019] Optionally, each of the ceramic isolation ribs is connected to the shell by welding.

[0020] Optionally, a push rod assembly and a moving contact piece are provided in the shell, and the push rod assembly is connected to the moving contact piece; in a first state, the moving contact piece and the stationary contact are in contact with each other; in a second state, the moving contact piece and the stationary contact are separated from each other.

[0021] According to the DC relay provided by the embodiment of the utility model, the insulation performance of the relay is enhanced by arranging an isolation rib or groove between the ceramic shell and the static contact of the relay, or arranging a transition step between the ceramic shell and the base plate, or arranging a groove in the ceramic shell near the base plate and the outer end surface of the shell, and it is achieved that only features need to be arranged on the ceramic shell without adding other additional parts, which can reduce the manufacturing cost of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features and advantages of the present invention are described below, which explains the present invention in more detail based on embodiments in conjunction with the accompanying drawings.

[0023] Figure 1 It is a structural cross-sectional view of one embodiment of a DC relay according to the utility model.

[0024] Figure 2 It is a structural cross-sectional view of another embodiment of the DC relay according to the utility model.

[0025] Figure 3 It is a top view of another embodiment of the DC relay according to the utility model.

[0026] Description of reference numerals:

[0027] 11-first stationary contact, 12-second stationary contact, 21-housing; 211-push rod assembly, 212-moving contact piece, 210-outer end surface of housing, 31-bottom plate, 41-ceramic isolation rib, 51-step, 61-second groove, 62-first groove. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "back" and similar expressions used herein are only for the purpose of illustration and are not intended to limit the present invention.

[0029] like Figure 1 and Figure 2 As shown, the DC relay includes: a housing 21; the housing 21 is made of ceramic material; a static contact, a part of which is arranged in the housing 21; a bottom plate 31, the bottom plate 31 is located below the static contact and the housing 21; a first isolation structure is arranged between the housing 21 and the static contact. According to the DC relay provided by the embodiment of the utility model, by arranging the first isolation structure between the ceramic housing 21 and the static contact of the relay, the first isolation structure has a shearing effect and a blocking effect on the arc generated in the arcing process of the relay, so that the arc in the arcing process is extinguished as soon as possible, thereby reducing arcing splashes caused by the arc in the arcing process of the relay.

[0030] The static contact may be made of metal. A ceramic metallization layer may be formed at the connection between the housing 21 and the static contact. Ceramic metallization refers to firmly adhering a layer of metal film to the surface of ceramic. Through the ceramic metallization layer on the housing 21, tight welding between the ceramic housing 21 and the metal static contact can be achieved, thereby obtaining a relay housing 21 with high reliability and high thermal conductivity. Similarly, a ceramic metallization layer may also be formed at the connection between the housing 21 and the base plate 31 to achieve a tighter connection between the housing 21 and the base plate 31.

[0031] The stationary contacts may include a first stationary contact 11 and a second stationary contact 12 .

[0032] like Figure 1 As shown, in one embodiment, the first isolation structure includes a plurality of second slots 61 disposed in the housing 21 around the central axis X of the first stationary contact 11. Preferably, the first isolation structure also includes a plurality of second slots 61 disposed in the housing 21 around the central axis Y of the second stationary contact 12.

[0033] By setting a plurality of second grooves 61 in the shell 21 around the central axis X of the first stationary contact 11 and setting a plurality of second grooves 61 in the shell 21 around the central axis Y of the second stationary contact 12, the plurality of second grooves 61 can serve to cut off the conduction of the arc generated in the relay along the ceramic metallization layer on the shell 21, thereby improving the insulation and voltage resistance performance of the relay.

[0034] Preferably, if Figure 1 As shown, a first groove 62 may also be provided in the housing 21 around the central axis T of the housing, close to the outer end surface 210 of the housing 21 and the bottom of the housing.

[0035] By arranging the first groove 62 in the housing 21 around the housing center axis T near the outer end surface 210 and the bottom of the housing 21, the conduction loop from the arc splash generated in the relay to the bottom plate can be extended, that is, the resistance value of the conduction loop is larger, and the insulation performance of the relay is improved. The first groove 62 can also increase the creepage distance between the static contact and the bottom plate, thereby further improving the insulation and withstand voltage performance of the relay. Moreover, the above-mentioned settings only require feature arrangement on the ceramic housing 21, without adding other parts, such as a plastic frame, etc., which can reduce the production cost of the relay and improve production efficiency.

[0036] like Figure 2 As shown, in another embodiment, the first isolation structure includes a ceramic isolation rib 41 disposed in the housing 21 around the central axis X of the first stationary contact 11 and / or a ceramic isolation rib 41 disposed in the housing 21 around the central axis Y of the second stationary contact 12. Figure 3 As shown, each ceramic isolation rib 41 is preferably connected to the housing 21 by welding.

[0037] Ceramic isolation ribs 41 are arranged in the shell 21 around the central axis X of the first static contact 11 and / or ceramic isolation ribs 41 are arranged in the shell 21 around the central axis Y of the second static contact 12. Thanks to the heat resistance of the ceramic material of the ceramic isolation ribs, the ceramic isolation ribs can maintain insulation performance, and through the stable insulation performance of the ceramic isolation ribs, a longer creepage distance between the static contact and the base plate can be maintained, thereby increasing the resistance value of the conduction circuit and thus improving the insulation performance.

[0038] Preferably, a second isolation structure is also provided between the housing 21 and the bottom plate 31, and the second isolation structure includes a step 51 formed by the housing 21 protruding downward from the bottom plate 31. By forming the step 51 between the ceramic housing 21 and the bottom plate 31, the creepage distance between the static contact and the bottom plate can be increased, thereby improving the insulation performance; at the same time, the step 51 can also make the conduction loop of the relay longer, thereby increasing the resistance value of the conduction loop, thereby improving the insulation performance. In addition, the above-mentioned setting only requires feature arrangement on the ceramic housing 21, without adding other components, such as a plastic frame, etc., which can reduce the production cost of the relay and improve production efficiency.

[0039] The working principle of DC relay can be described as follows Figure 2 As shown, a push rod assembly 211 and a moving contact piece 212 are arranged inside the housing 21. The push rod assembly 211 is connected to the moving contact piece 212, and the moving contact piece 212 can contact and separate with the first and second stationary contacts 11 and 12 through the movement of the push rod assembly 211. The working principle of the first static contact 11, the second static contact 12 and the push rod assembly 211 is similar to that in the prior art, that is, static contacts are provided at the bottom of the first static contact 11 and the second static contact 12, wherein the current flows into one of the static contacts, i.e., the load lead-out terminal, and the current flows through the inside of the housing and flows out of the other static contact, i.e., the load lead-out terminal, and wherein the moving contact piece 212 installed in the housing 21 is installed in the push rod assembly 211 through a spring, and the push rod assembly 211 is connected to the magnetic circuit. Under the action of the magnetic circuit, the push rod assembly 211 drives the moving contact piece 212 to move upward, so that in the first state, the contacts at both ends of the moving contact piece 212 are respectively in contact with the static contacts at the bottom of the first static contact 11 and the second static contact 12, thereby realizing the connection of the load. In the second state, the contacts at both ends of the moving contact piece 212 are respectively separated from the static contacts at the bottom of the first static contact 11 and the second static contact 12. Specifically, the push rod assembly of the present application may use the push rod assembly 211 of CN115881476A, and its specific structure will not be described in detail herein.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, 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.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A DC relay, characterized in that: include: A housing (21); the housing (21) is made of ceramic material; a stationary contact, a portion of which is disposed in the housing (21); A bottom plate (31), the bottom plate (31) being located below the stationary contact and the housing (21); A first isolation structure is provided between the housing (21) and the stationary contact.

2. The DC relay according to claim 1, characterized in that: A second isolation structure is provided between the shell (21) and the bottom plate (31), the second isolation structure comprising a step (51) formed by the shell (21) protruding downward from the bottom plate (31).

3. The DC relay according to claim 1, characterized in that: A first groove (62) is provided in the housing (21) near the outer end surface (210) of the housing (21) and the bottom of the housing and around the central axis T of the housing.

4. The DC relay according to claim 1, characterized in that: The stationary contacts comprise a first stationary contact (11) and a second stationary contact (12).

5. The DC relay according to claim 4, characterized in that: The first isolation structure comprises a plurality of second grooves (61) arranged in the housing (21) around the central axis X of the first stationary contact (11).

6. The DC relay according to claim 5, characterized in that: The first isolation structure also includes a plurality of second grooves (61) arranged in the housing (21) around the central axis Y of the second stationary contact (12).

7. The DC relay according to claim 4, characterized in that: The first isolation structure comprises a ceramic isolation rib (41) arranged in the housing (21) around the central axis X of the first stationary contact (11).

8. The DC relay according to claim 7, characterized in that: The first isolation structure also includes ceramic isolation ribs (41) arranged in the housing (21) around the central axis Y of the second stationary contact (12).

9. The DC relay according to claim 8, characterized in that: Each of the ceramic isolation ribs (41) is connected to the housing (21) by welding.

10. The DC relay according to claim 1, characterized in that: A push rod assembly (211) and a moving contact piece (212) are arranged in the housing (21), and the push rod assembly (211) is connected to the moving contact piece (212); in a first state, the moving contact piece (212) and the stationary contact are in contact with each other; in a second state, the moving contact piece (212) and the stationary contact are separated from each other.

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