Bimetal large-current protector

Abstract

The utility model relates to a bimetallic heavy current protector, comprising an upper terminal and a lower conduction part which are oppositely and fixedly arranged; the elastic guide piece is close to one side of the bimetallic element. According to the utility model, through the combined design of the elastic guide piece and the bimetallic element, two groups of contacts can be formed between the elastic guide piece and the lower conduction part, and the two groups of contacts can form a parallel working effect in position relation, compared with the prior art, the number of the contact groups is increased on the basis that the size is controlled, and the working efficiency is improved. Therefore, when in work, even if one pair of contacts fails to be powered on or powered off, the other pair of contacts can still provide a protection effect, so that better reliability is achieved, and through structural innovation, the use effect is improved, meanwhile, the size requirement for miniaturization is met, and thus better market prospects are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit protection equipment, in particular to a bimetallic high current protector. Background Art

[0002] In some electronic products (such as new energy, medical equipment, smart home appliances, heating appliances, etc.), overheat protection is used to provide power-off protection when the product is overheated or overcurrent occurs. In current technology, overheat protectors mostly use a pair of contacts for overcurrent design. Due to the limited number of contact groups, this design has more significant disadvantages. Specifically: First, when there are foreign objects between the contacts or carbon deposits between the on and off contacts, it is easy to cause the product to not conduct, or cause false triggering signals; second, because the market products tend to be miniaturized, there are also size requirements for the protectors they carry. The existing bimetallic protectors on the market meet the miniaturization size requirements at the same time, but due to the current effect when overcurrent occurs, it is easy to cause the protector itself to heat up, so it is difficult to meet the selection requirements. Utility Model Content

[0003] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0004] In view of the following technical problems in the prior art: the current bimetallic thermal protection products are prone to problems such as unsmooth switching and inconvenience in use due to self-overheating due to the limited number of contacts. To solve this technical problem, the utility model provides the following technical solutions:

[0005] A bimetallic high current protector comprises a housing, a lower terminal, a spring sheet moving contact, a spring sheet static contact, a bimetallic element, a spring sheet, an upper terminal, a fixing seat, a sealant, a wire, a bimetallic element moving contact, and a bimetallic element static contact; a wire welding positioning claw is arranged at one end of the upper terminal, and a spring sheet connecting boss is arranged at the other end; a wire welding positioning claw is arranged at one end of the lower terminal, a fixing seat connecting ring is arranged at the middle end, a spring sheet static contact and a bimetallic element static contact are arranged at the other end, a wire welding positioning claw is arranged at one end of the upper terminal, and a wire welding positioning claw is arranged at one end of the lower terminal Wires are welded on them respectively, and the upper terminal and the lower terminal are simultaneously placed in a plastic mold for injection processing to form a fixed seat assembly; a bimetallic element moving contact is provided at one end of the bimetallic element, the bimetallic element is placed in the groove of the fixed seat, the hole of the hole end of the bimetallic element is sleeved on the elastic conductive sheet connecting boss of the upper terminal, and then the elastic conductive sheet with the moving contact is placed above the bimetallic element, and the other end of the elastic conductive sheet is connected to the elastic conductive sheet connecting boss provided on the upper terminal to form a contact parallel type miniature bimetallic high current protector assembly, and the thermal protector assembly is covered with an outer shell and fixed with a sealant.

[0006] A bimetallic element flip boss is arranged at one end of the fixing seat.

[0007] The bimetallic element is provided with a bimetallic element moving contact.

[0008] There is at least one fixing seat connecting ring arranged at the middle end of the lower terminal.

[0009] The bimetallic high current protector provided by the utility model has the beneficial effect that: through the combined design of the elastic guide and the bimetallic element, two groups of contacts can be formed between the lower conductive part, and the two groups of contacts can form a parallel working effect in terms of positional relationship. Compared with the prior art, the utility model achieves an increase in the number of contact groups on the basis of controlled size, so that when in operation, even if one pair of contacts fails to turn on and off, the other pair can still provide protection, thereby having better reliability. The utility model improves the use effect through structural innovation, while meeting the miniaturized size requirements, thereby having better market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0011] Figure 1This is a diagram showing the internal structure of the utility model from a longitudinal section perspective.

[0012] Figure 2 This is a diagram showing the internal structure of the utility model from a horizontal cross-sectional perspective.

[0013] Figure numerals: 1. housing; 2. lower terminal; 3. spring sheet moving contact; 4. spring sheet static contact; 5. elastic guide; 6. bimetallic element; 7. fixing seat; 8. upper terminal; 9. sealant; 10. wire; 11. bimetallic element moving contact; 12. bimetallic element static contact; 13. wire welding positioning claw; 14. spring sheet connecting boss; 15. fixing seat connecting ring; 16. bimetallic element flip boss; 17. slot. DETAILED DESCRIPTION

[0014] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0015] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0016] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0017] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0018] The utility model provides a bimetallic high current protector, which includes the following parts:

[0019] The upper terminal 8 and the lower conducting part are relatively fixedly arranged and used to connect an external circuit. Specifically, the upper terminal 8 and the lower conducting part are used to connect to a circuit that needs to be controlled inside the product;

[0020] The elastic guide 5 and the bimetallic element 6, one end of each of which is fixedly connected to the upper terminal 8 and is in conduction, and the other ends of each of which are respectively used to contact different locations of the lower conductive portion. In terms of positional relationship, the elastic guide 5 is close to one side of the bimetallic element 6, and when the bimetallic element 6 is heated, a force can be applied to the elastic guide 5;

[0021] In the present invention, a set of contact points is formed between the elastic guide 5 and the lower conducting part, and a set of contact points is formed between the bimetallic element 6 and the lower conducting part, so that two sets of contact points are formed between the upper terminal 8 and the lower conducting part, and the two sets of contacts are connected in parallel in position. The present invention will be specifically described below through two embodiments:

[0022] Example 1

[0023] Reference Figure 1 and 2 The utility model includes a housing 1, a lower terminal 2, a spring sheet moving contact 3, a spring sheet static contact 4, a spring sheet 5, a bimetallic element 6, a fixing seat 7, an upper terminal 8, a sealant 9, a wire 10, a bimetallic element moving contact 11, a bimetallic element static contact 12, a wire welding positioning claw 13, a spring sheet connecting boss 14, a fixing seat connecting ring 15 and a bimetallic element flip boss 16; the lower terminal 2 and the spring sheet static contact 4 and the bimetallic element static contact 12 constitute the lower conducting part described in the utility model, the spring sheet 5 is used to achieve the effect of the elastic guide described in the utility model, one end of the upper terminal 8 is provided with a wire welding positioning claw 13, and the other end is provided with a spring sheet connecting boss 14, one end of the lower terminal 2 is provided with a wire welding positioning claw 13, the middle end is provided with a fixing seat connecting ring 15, and the other end is provided with a spring sheet static contact 4, and the bimetallic element static contact 12. A wire welding positioning claw 13 provided at one end of the upper terminal 8 and a wire welding positioning claw 13 provided at one end of the lower terminal 2 are respectively welded with a wire 10, which is used to connect to the circuit to be detected. The upper terminal 8 and the lower terminal 2 are simultaneously placed in a plastic mold for injection processing to form a fixed seat 7 assembly, and a bimetallic element flip boss 16 is provided at one end of the fixed seat; a bimetallic element 6 provided with a slot hole 17 at one end and a bimetallic element moving contact 11 at the middle end is placed in the slot of the fixed seat 7, and the slot hole at the slot hole end of the bimetallic element 6 is sleeved on the spring sheet connecting boss 14 of the upper terminal 8, and then a spring sheet 5 provided with a spring sheet moving contact 3 is placed above the bimetallic element 6, and the other end of the spring sheet 5 is connected to the spring sheet connecting boss 14 provided on the upper terminal 8 to form a thermal protector assembly, and the thermal protector assembly is covered with the shell 1 and fixed with the sealant 9.

[0024] At least one fixing seat connecting ring 15 is disposed at the middle end of the lower terminal 2 .

[0025] The upper terminal 8 and the lower terminal 2 are simultaneously placed in a plastic mold and injection-processed to form a fixing seat assembly.

[0026] The upper terminal 8 and the lower terminal 2 are respectively provided with wire welding positioning claws.

[0027] A bimetallic element flip boss 16 is disposed at one end of the fixing seat 7 .

[0028] The bimetallic element 6 is provided with a bimetallic element moving contact 11 .

[0029] In the utility model, when the bimetallic element 6 is in normal state, the bimetallic element moving contact 11 is in contact with the bimetallic element static contact 12, and the spring sheet 5 is in contact with the spring sheet moving contact 3 and the spring sheet static contact 4. When the temperature of the protected electrical component is abnormally high, the bimetallic element 6 of the contact parallel type micro bimetallic high current protector senses the pre-made temperature and quickly reverses to push the spring sheet 5 to disconnect the moving contact 3 from the static contact 4, and the main circuit of the protected electrical component is quickly disconnected to avoid damage. When the temperature drops to the reset temperature of the bimetallic element 6, the bimetallic element 6 resumes flipping, and the moving contact and the static contact of the contact parallel type micro bimetallic high current protector are closed, and the main circuit of the protected electrical component is reconnected to restore the normal working state.

[0030] The contact parallel type micro bimetallic high current protector is reasonably designed. The innovative design of two pairs of contacts in parallel can provide reliable protection even if one pair of contacts fails to switch on or off. The utility model is a pure temperature control product with precise temperature control, safer and more reliable product performance, and a small size suitable for automated production of overheating protectors.

[0031] Example 2

[0032] The content of this embodiment is basically the same as that of the first embodiment, except that: in this embodiment, the action direction of the bimetallic element 6 is just set opposite. Specifically, in the normal state, the bimetallic element 6 separates the bimetallic element moving contact 11 from the bimetallic element static contact 12, and the spring sheet 5 is pushed by the bimetallic element 6 to separate the spring sheet moving contact 3 from the spring sheet static contact 4; therefore, in terms of structure, the relationship between the two groups of contact points formed between the upper terminal 8 and the lower conductive part is normally open, which is opposite to the first embodiment. This design can better meet the work of the utility model under different requirements, thereby better taking into account different types of products.

[0033] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A bimetallic high current protector, characterized in that: include: An upper terminal (8) and a lower conducting portion, wherein the upper terminal (8) and the lower conducting portion are relatively fixedly arranged and used to connect an external circuit; The elastic guide (5) and the bimetallic element (6) have one end fixedly connected to the upper terminal (8) and in conduction, and the other end is used to contact different locations of the lower conducting portion. The elastic guide (5) is close to one side of the bimetallic element (6).

2. The bimetallic high current protector according to claim 1, characterized in that: The lower conducting portion comprises a spring sheet static contact (4) and a bimetallic element static contact (12) which are in phase conduction and are fixedly arranged relative to the upper terminal. The spring sheet static contact (4) and the bimetallic element static contact (12) are used to contact the elastic guide (5) and the bimetallic element (6) respectively.

3. The bimetallic high current protector according to claim 2, characterized in that: The lower conducting portion further comprises a lower terminal (2), the lower terminal (2) being in conduction with the spring sheet static contact (4) and the bimetallic element static contact (12), and being used for connecting an external circuit.

4. The bimetallic high current protector according to claim 2, characterized in that: It also includes a spring sheet moving contact (3) and a bimetallic element moving contact (11), wherein the spring sheet moving contact (3) and the bimetallic element moving contact (11) are respectively connected to one end of the elastic guide (5) and the bimetallic element (6), and are respectively used to contact the spring sheet static contact (4) and the bimetallic element static contact (12).

5. The bimetallic high current protector according to claim 3, characterized in that: Also includes: A spring sheet connecting boss (14) fixedly connected to the elastic guide (5); A bimetallic element flip boss (16) fixedly connected to the bimetallic element (6); as well as: The fixing seat (7) is fixedly connected to the spring sheet connecting boss (14) and the bimetallic element flip boss (16), and the fixing seat (7) and the upper terminal (8) are relatively fixedly arranged.

6. The bimetallic high current protector according to claim 5, characterized in that: It also comprises a shell (1), wherein the fixing seat (7) is fixedly arranged in the shell (1) by means of a sealing glue (9).

7. The bimetallic high current protector according to claim 3, characterized in that: It also comprises a wire welding positioning claw (13), the upper terminal (8) and the lower terminal (2) are both provided with a wire welding positioning claw (13), and the two wire welding positioning claws (13) are both connected to a wire (10).

8. The bimetallic high current protector according to claim 5, characterized in that: It also comprises a fixing seat connecting ring (15), and the middle end of the lower terminal (2) is connected to the fixing seat (7) via the fixing seat connecting ring (15).

9. The bimetallic high current protector according to claim 1, characterized in that: The bimetallic element (6) is normally separated from the lower conducting portion, and the elastic guide (5) remains separated from the lower conducting portion under the action of the bimetallic element (6).

10. The bimetallic high current protector according to claim 1, characterized in that: The bimetallic element (6) is in contact with the lower conductive part in a normal state, and the elastic guide (5) is not affected by the bimetallic element (6) and maintains contact with the lower conductive part.

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