Sealing shell structure of thermal protector

Abstract

The utility model relates to the field of thermal protectors, in particular to a sealing shell structure of a thermal protector, which comprises a rectangular shell with an opening at one end, an inner support block and an outer support block are arranged in the shell, a first contact piece, a contact piece and a mounting piece which are parallel to one another are arranged between the inner support block and the outer support block, and the mounting piece is close to the first contact piece. A bimetallic strip is arranged on the mounting piece, one end of the bimetallic strip is electrically connected with the first contact piece, the other end of the bimetallic strip is provided with a contact, and the contact is in contact with the second contact piece at normal temperature; two wiring terminals are embedded in the outer supporting block, the two wiring terminals are electrically connected with the first contact piece and the second contact piece respectively, and wires are led out from the two wiring terminals respectively; a clamping cover is arranged at the opening end of the shell and connected with the shell in a clamped mode. The clamping cover is used for replacing a sealing plug in the prior art, dismounting is more convenient, and meanwhile air needed to be squeezed by the clamping cover and the outer supporting block is reduced through the connecting layer, the movable layer and the sealing layer, and meanwhile the air tightness between the clamping cover and the outer supporting block is guaranteed.

Description

Technical Field

[0001] The utility model relates to a thermal protector, in particular to a sealing shell structure of a thermal protector, belonging to the field of thermal protectors. Background Art

[0002] A thermal protector is a temperature controller composed of two different alloys combined together. A temperature controller refers to a series of automatic control components that, according to the temperature change of the working environment, undergo physical deformation inside the switch, thereby generating certain special effects and producing on or off actions. It is also called a temperature control switch, a temperature protector, a temperature controller, or simply a temperature controller. When the existing thermal protector is in use, the problem of shortening the life of the thermal protector is caused by poor sealing.

[0003] CN218730653U discloses a sealed thermal protector, including a shell and a sealing plug detachably and fixedly assembled at one end of the shell. The sealing plug is used at the opening end of the shell to ensure the sealing inside the shell. However, the following problems exist in this technical solution: 1. The support block needs to be fixedly connected to the shell, and the sealing plug is embedded in the shell. It is not convenient to disassemble when the internal bimetal needs to be inspected; 2. The guide pin assembly is connected to the contact piece, and the guide pin assembly is arranged in the sealing plug. However, when the sealing plug is inserted into the shell, the air between the sealing plug and the outer insulating support block is difficult to be completely discharged, which will cause a gap between the contact pieces of the guide pin assembly, resulting in poor contact; 3. The bimetal is arranged on one contact piece. When the bimetal is deformed by heat and jumps out, it will impact the contact piece, and long-term use will cause the contact piece to deform and affect the service life. Summary of the Utility Model

[0004] The main purpose of the utility model is to overcome the above-mentioned shortcomings existing in the prior art, and to provide a sealing shell structure of a thermal protector.

[0005] The utility model is realized by the following technical solutions:

[0006] A sealing shell structure of a thermal protector includes a rectangular shell with an opening at one end. An inner support block and an outer support block are arranged inside the shell. Between the inner support block and the outer support block, a first contact piece, a second contact piece, and a mounting piece parallel to each other are arranged. The mounting piece is close to the first contact piece, and a bimetal is arranged on the mounting piece. One end of the bimetal is electrically connected to the first contact piece, and the other end is provided with a contact head. The contact head contacts the second contact piece at normal temperature; two wiring terminals are embedded in the outer support block. The two wiring terminals are respectively electrically connected to the first contact piece and the second contact piece, and wires are respectively led out from the two wiring terminals; a snap cover is arranged at the opening end of the shell, and the snap cover is snap-connected to the shell.

[0007] Further, the snap cover includes a cover plate, a buckle, a connection layer, a movable layer, and a sealing layer;

[0008] A plurality of the buckles are provided and arranged on the side surface of the cover plate, and the buckling connection between the cover and the housing is realized by matching with the bumps on the outside of the housing.

[0009] Further, both the connecting layer and the movable layer are hollow cuboids. The connecting layer is fixed to the bottom of the cover plate. The movable layer is elastically connected to the cover plate through a spring and sleeved outside the connecting layer. The sealing layer is arranged at the bottom of the movable layer. When the cover is buckled to the housing, the sealing layer is in close contact with the outer support block under the action of the spring.

[0010] Further, the sealing layer is made of insulating rubber, and the area of the sealing layer is larger than the opening area of the housing.

[0011] Further, a convex ring is arranged inside the housing, a groove adapted to the convex ring is arranged on one side of the outer support block, a sealing ring is arranged between the convex ring and the groove, and the outer support block presses the sealing ring and is in close contact with the convex ring under the action of the cover.

[0012] Further, a wire hole for the wire to pass through is provided on the cover, and a sealing ring is arranged between the wire hole and the wire.

[0013] Advantages of the present utility model:

[0014] By using the cover to replace the original sealing plug in the prior art, the present utility model is more convenient to disassemble. At the same time, the air that needs to be squeezed between the cover and the outer support block is reduced by the connecting layer, the movable layer and the sealing layer, while ensuring the airtightness between the cover and the outer support block.

[0015] By separating the outer insulating block from the housing and using the convex ring and the sealing ring to fix the outer insulating block under the action of the cover, the present utility model is convenient for overall disassembly and maintenance.

[0016] By adding the mounting piece, the bimetallic strip is fixed on the mounting piece and electrically connected to the contact piece. When the bimetallic strip thermally jumps, the mounting piece bears the impact force generated by the deformation of the bimetallic strip, avoiding the deformation of the contact piece and the poor contact with the terminal after being impacted for a long time.

[0017] By embedding the terminal in the outer support block and passing the lead wire through the cover, the present utility model avoids the poor contact that may occur due to the air not being completely squeezed out and the resulting gaps in the prior art.

[0018] The following further describes the present utility model with reference to the drawings and embodiments. Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the present utility model;

[0020] Figure 2 is the structural schematic diagram of the cover of the present utility model;

[0021] Wherein: the housing 1, the convex ring 11, the sealing ring 12, the inner support block 2, the outer support block 3, the first contact piece 4, the second contact piece 5, and the mounting piece 6, the bimetal piece 7, the contact 8, the terminal 9, the card cover 10, the cover plate 101, the buckle 102, the connection layer 103, the active layer 104, and the sealing layer 105. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] As Figure 1 shown, this embodiment provides a sealed housing structure of a thermal protector, including a rectangular housing 1 with one end open. An inner support block 2 and an outer support block 3 are arranged inside the housing 1. Between the inner support block 2 and the outer support block 3, there are arranged a first contact piece 4, a second contact piece 5 and a mounting piece 6 which are parallel to each other. The mounting piece 6 is close to the first contact piece 4, and a bimetal piece 7 is arranged on the mounting piece 6. One end of the bimetal piece 7 is electrically connected to the first contact piece 4, and the other end is provided with a contact 8 which contacts the second contact piece 5 at normal temperature. Two terminals 9 are embedded in the outer support block 3. The two terminals 9 are respectively electrically connected to the first contact piece 4 and the second contact piece 5, and wires are respectively led out from the two terminals 9. A card cover 10 is arranged at the open end of the housing 1, and the card cover 10 is snap-connected to the housing 1.

[0024] In order to solve the problem that it is difficult to completely discharge the air between the sealing plug and the outer support block in the prior art, this embodiment provides a card cover structure: As Figure 2As shown in the figure, it includes a cover plate 101, a buckle 102, a connection layer 103, a movable layer 104 and a sealing layer 105. Among them, a plurality of buckles 102 are provided on the side of the cover plate 101 to realize the clamping connection between the cover plate 101 and the housing 1, and the cover 10 and the housing 1 can also be fixed by other common means. Both the connection layer 103 and the movable layer 104 are hollow cuboids. The connection layer 103 is fixed to the bottom of the cover plate 101. The movable layer 104 is elastically connected to the cover plate 101 by a spring and sleeved outside the connection layer 103. The sealing layer 105 is provided at the bottom of the movable layer 104. The sealing layer 105 is made of insulating rubber and has an area larger than the opening area of the housing 1. When the cover 1 is clamped with the housing 1, the spring squeezes the sealing layer 105 to move outward in the direction of the outer support block 3. The sectional area ratio of the connection layer 103, the movable layer 104, the sealing layer 105 and the opening of the housing 1 is: connection layer 103 < movable layer 104 < housing 1 opening < sealing layer 105. When the cover is inserted, one side of the sealing layer 105 bends. At the same time, under the action of the spring and the buckle, the sealing layer 105 always squeezes the air between the outer support block 3 and the sealing layer 105, and finally the air is completely discharged unidirectionally from both sides of the sealing layer 105, ensuring the airtightness inside the housing 1.

[0025] On the basis of the above embodiments, in order to solve the problem that the outer support block is difficult to disassemble in the prior art, this embodiment provides a matching structure between the outer support block and the housing 1. By setting a convex ring 11 inside the housing 1, a groove 31 adapted to the convex ring 11 is provided on one side of the outer support block 3, and a sealing ring 12 is provided between the convex ring 11 and the groove. The outer support block 3 squeezes the sealing ring 12 and is in close contact with the convex ring 11 under the action of the cover 10, so as to form a sealing structure between the outer support block 3 and the convex ring 11, and while ensuring the detachable structure of the outer support block 3, double guarantee the airtightness of the space inside the bimetallic sheet.

[0026] In this embodiment, both the first contact piece 4 and the second contact piece 5 are electrically connected to the wiring terminal and thus connected to the circuit to be protected. Among them, the wiring terminal is embedded in the outer support block 3, and the wiring terminal and the outer support block 3 can be further sealed. Wires are led out from both wiring terminals 9, pass through the cover 10 and are connected to the external circuit. The contact part between the wire and the cover 10 is sealed. In this embodiment, it is realized by setting a sealing ring.

[0027] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A sealed housing structure of a thermal protector, characterized in that: The invention comprises a rectangular shell (1) with an opening at one end, wherein an inner support block (2) and an outer support block (3) are arranged in the shell (1), and a first contact piece (4), a second contact piece (5) and a mounting piece (6) which are parallel to each other are arranged between the inner support block (2) and the outer support block (3), wherein the mounting piece (6) is close to the first contact piece (4), and a bimetallic piece (7) is arranged on the mounting piece (6), wherein one end of the bimetallic piece (7) is electrically connected to the first contact piece (4), and the other end is provided with a contact (8), wherein the contact (8) contacts the second contact piece (5) at room temperature; two wiring terminals (9) are embedded in the outer support block (3), wherein the two wiring terminals (9) are electrically connected to the first contact piece (4) and the second contact piece (5) respectively, and wires are led out of the two wiring terminals (9); and a card cover (10) is arranged at the open end of the shell (1), and the card cover (10) is card-engaged with the shell (1).

2. The sealed housing structure of a thermal protector according to claim 1, characterized in that: The card cover (10) comprises a cover plate (101), a buckle (102), a connecting layer (103), a movable layer (104) and a sealing layer (105); The buckles (102) are provided in plurality and are arranged on the side of the cover plate (101), and are engaged with protrusions on the outside of the shell (1) to achieve the buckling connection between the card cover (10) and the shell (1).

3. The sealed housing structure of a thermal protector according to claim 2, characterized in that: The connection layer (103) and the movable layer (104) are both hollow rectangular parallelepipeds; the connection layer (103) is fixed to the bottom of the cover plate (101); the movable layer (104) is elastically connected to the cover plate (101) via a spring and sleeved outside the connection layer (103); the sealing layer (105) is arranged at the bottom of the movable layer (104); when the card cover (10) is engaged with the housing (1), the sealing layer (105) is in close contact with the outer support block (3) under the action of the spring.

4. A sealed housing structure of a thermal protector according to claim 2 or 3, characterized in that: The sealing layer (105) is insulating rubber, and the area of ​​the sealing layer (105) is larger than the opening area of ​​the housing (1).

5. The sealed housing structure of a thermal protector according to claim 3, characterized in that: A convex ring (11) is arranged in the housing (1), a groove (31) matching the convex ring (11) is arranged on one side of the outer support block (3), a sealing ring (12) is arranged between the convex ring (11) and the groove, and the outer support block (3) squeezes the sealing ring (12) under the action of the card cover (10) and is in close contact with the convex ring (11).

6. The sealed housing structure of a thermal protector according to claim 1, characterized in that: The card cover (10) is provided with a wire hole (106) for a wire to pass through, and a sealing ring is provided between the wire hole (106) and the wire.

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