Built-in over-temperature and over-current protector

Abstract

The utility model relates to a built-in over-temperature and over-current protector, which comprises a bimetallic element and a static contact, and is characterized in that the bimetallic element is matched with the static contact to form connection and disconnection when acting; the static contact and one end of the bimetallic element are fixedly connected to the bottom plate; the heating element is connected to the static contact in a conducting manner; the shell is fixedly connected with the bottom plate, and insulation paper is arranged between the shell and the bottom plate; and the sealing injection molding rubber is packaged between the bottom plate and the insulation paper. In the structure of the utility model, due to the arrangement of the sealing injection molding part, the connection sealing performance between the bottom plate and the shell is ensured, and the internal heating wire ensures that heat can be quickly generated to enable the bimetallic element to act when the current is too high, so that the protection effect on the motor is fully improved; therefore, the whole matching product can be better assembled in the motor, the manufacturing process is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor protection equipment, in particular to a built-in over-temperature and over-current protector. Background Art

[0002] In the current technology, for the overcurrent protection method of the motor, a PTC controller is used to control the on-off of the motor power supply line according to the overcurrent situation of the line, thereby playing a protective role.

[0003] As mentioned above, the PTC controller is usually arranged outside the motor. Due to the limitation of sealing, the current technology cannot directly arrange the protector inside the motor, so that the protector cannot be packaged with the whole motor, which is not convenient for the manufacturing process. Utility Model Content

[0004] 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.

[0005] In view of the following technical problems in the prior art: In the current technology, due to the limitation of sealing, the protector cannot be directly set inside the motor, which is not conducive to the manufacturing process of the motor. In order to solve this technical problem, the utility model provides the following technical solutions:

[0006] A built-in over-temperature and over-current protector, comprising a bimetallic element and a static contact, wherein the bimetallic element cooperates with the static contact to form conduction and disconnection when in action, and further comprising:

[0007] A bottom plate, the static contact and one end of the bimetallic element are fixedly connected to the bottom plate;

[0008] A heating element, conductively connected to the static contact;

[0009] The housing is fixedly connected to the bottom plate and is separated from the bottom plate by insulating paper;

[0010] The sealing plastic injection glue is encapsulated between the bottom plate and the insulating paper.

[0011] As a preferred technical solution for a built-in over-temperature and over-current protector, the shell includes a first shell and a second shell, the bimetallic element is arranged in the first shell, the second shell has a concave structure, and the bottom plate and its inner wall are in contact with each other through insulating paper.

[0012] As a preferred technical solution for a built-in over-temperature and over-current protector, the heating element is arranged in the first shell and close to the bimetallic element.

[0013] As a preferred technical solution of a built-in over-temperature and over-current protector, the heating element includes a heating wire, at least a part of which is located in the sealing injection molding glue.

[0014] As a preferred technical solution for a built-in over-temperature and over-current protector, it also includes a moving contact, which is fixedly connected to one end of the bimetallic element and is used to contact the static contact.

[0015] As a preferred technical solution of a built-in over-temperature and over-current protector, it also includes a PTC element and an external terminal, and the PTC element is electrically connected between the bimetallic element and the external terminal.

[0016] As a preferred technical solution for a built-in over-temperature and over-current protector, it also includes a steel card, which is fixedly arranged on the bottom plate, and the PTC element is connected to the steel card.

[0017] The built-in over-temperature and over-current protector provided by the utility model has the beneficial effects that: in the structure of the utility model, due to the setting of the sealed injection molded parts, the sealing of the connection between the bottom plate and the outer shell is ensured, and the internal heating wire ensures that when the current is too high, it can quickly generate heat to make the bimetallic element actuate, thereby fully improving the protection effect on the motor, so that the overall product can be better assembled inside the motor, thereby simplifying the manufacturing process to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 This is a front view of the present invention.

[0020] Figure 2 For the utility model Figure 1 Cross-sectional view from the CC direction.

[0021] Figure 3 This is a rear perspective view of the present invention.

[0022] Figure 4 This is an end view of the utility model.

[0023] Figure 5It is a side perspective view of the present utility model.

[0024] Figure 6 It is a schematic diagram of the bottom plate injection molding process in the present invention.

[0025] Figure 7 For the utility model Figure 6 Side view of.

[0026] Figure numerals: 1. bimetallic element; 2. static contact; 3. base plate; 4. heating element; 5. housing; 501. first shell; 502. second shell; 6. insulating paper; 7. sealing injection molding glue; 8. moving contact; 9. PTC element; 10. external terminal; 11. steel card. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Reference Figure 1-7 The first embodiment of the utility model provides a built-in over-temperature and over-current protector, including a bimetallic element 1 and a static contact 2. The bimetallic element 1 is used to form a conductive and disconnected state with the static contact 2 when in action, thereby playing a protective effect on the on-off of the circuit. In addition, the utility model also includes the following parts:

[0032] The bottom plate 3, the static contact 2 and one end of the bimetallic element 1 are fixedly connected to the bottom plate 3, so as to achieve relative fixation between the bimetallic element 1 and the static contact 2;

[0033] A heating element 4, which is used to generate heat when the current is too high and is conductively connected to the static contact 2;

[0034] The housing 5 is fixedly connected to the bottom plate 3 and is separated from the bottom plate 3 by an insulating paper 6. The bottom plate 3 and the bimetallic element 1 are both used to connect the circuit to be controlled. The housing 5 finalizes the appearance of the entire product.

[0035] Sealing injection molding glue 7, which is encapsulated between the bottom plate 3 and the insulating paper 6, so as to fully ensure the sealing between the housing 5 and the outside;

[0036] Compared with the prior art, when the product is assembled with the motor, the whole product can be directly encapsulated inside the motor. When the motor current is too large, the current in its power supply circuit increases synchronously, causing the heating element 4 to generate heat and the bimetallic element 1 to act, thereby separating from the static contact 2 to achieve the circuit disconnection effect. The heating element 4 ensures the timeliness of the action of the bimetallic element 1 and improves the safety protection effect of the motor. The injection molding effect of the sealing injection molding glue 7 on the bottom plate 3 further ensures the sealing between the bottom plate 3 on the shell 5 and the outside world, so that the assembly inside the motor can be better realized and the injection molding process after the motor assembly is simplified, thereby reducing the assembly difficulty of the entire motor and effectively reducing the production cost.

[0037] Further, see Figure 2 and Figure 4 The shell 5 structurally includes a first shell 501 and a second shell 502. The bimetallic element 1 is arranged in the first shell 501. The second shell 502 is a concave structure. The bottom plate 3 and the inner wall of the second shell 502 form a conflicting relationship through the insulating paper 6, thereby ensuring the insulation effect between the bottom plate 3 and the entire shell, and also ensuring the insulation effect of the product after final assembly.

[0038] Further, see Figure 2 The heating element 4 is arranged in the first shell 501 and close to the bimetallic element 1. This arrangement ensures that when the heating element 4 generates heat, the heat can be concentrated in the first shell 501, so as to be fully transferred to the bimetallic element 1. The close distance further ensures the direct heat transfer effect.

[0039] Further, see Figure 2 and Figure 6The heating element 4 can be an electric heating wire, and at least a part of its structure is located in the sealing injection molding glue 7. The bottom plate 3 is injection molded to increase the fixing effect of the heating element 4, thereby increasing the stability of its setting, and at the same time ensuring that the positioning effect of the heating element 4 can be achieved in the early stage of production of this product. For example, when the heating element 4 is an electric heating wire, this design is used to facilitate the spot welding process of the end of the heating wire, thereby further reducing the complexity of the process flow.

[0040] Further, see Figure 2 The present invention also includes a moving contact 8, which is fixedly connected to one end of the bimetallic element 1 and is used to contact the static contact 2, thereby ensuring a good contact effect between the bimetallic element 1 and the static contact 2 when the bimetallic element 1 is in motion.

[0041] Further, see Figure 1-7 The utility model also includes a PTC element 9, the outside of the shell is connected to the circuit to be controlled through an external terminal 10, and the PTC element 9 is electrically connected between the bimetallic element 1 and one of the external terminals 10. The series setting of the PTC element 9 in the circuit can cooperate with the bimetallic element 1 to further improve the timely power-off effect when overcurrent or heat occurs, and at the same time, it can play a conductive reset effect of the circuit when the current state and temperature are restored, thereby assisting this product to further improve the safety protection effect of the motor when overcurrent and overtemperature occur.

[0042] Further, see Figure 2 Regarding the setting method of PTC, the utility model also includes a steel card 11, which is fixedly set on the bottom plate 3. The PTC element 9 is connected to the steel card 11, so that it is fixed inside the shell to prevent it from forming physical activities inside the product, thereby preventing shaking and improving the structural stability when it is set itself.

[0043] 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.

[0044] 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 built-in over-temperature and over-current protector, comprising a bimetallic element (1) and a static contact (2), wherein the bimetallic element (1) cooperates with the static contact (2) to form conduction and disconnection when in operation, and is characterized in that: Also includes: A bottom plate (3), the static contact (2) and one end of the bimetallic element (1) are fixedly connected to the bottom plate (3); A heating element (4) conductively connected to the static contact (2); A housing (5) which is fixedly connected to the bottom plate (3) and has insulating paper (6) between it and the bottom plate (3); The sealing injection molding glue (7) is encapsulated between the base plate (3) and the insulating paper (6).

2. The built-in over-temperature and over-current protector according to claim 1, characterized in that: The housing (5) comprises a first shell (501) and a second shell (502); the bimetallic element (1) is arranged in the first shell (501); the second shell (502) is of a concave structure; the bottom plate (3) and its inner wall are in contact with each other through insulating paper (6).

3. The built-in over-temperature and over-current protector according to claim 2 is characterized in that: The heating element (4) is arranged in the first shell (501) and is close to the bimetallic element (1).

4. The built-in over-temperature and over-current protector according to claim 1, characterized in that: The heating element (4) comprises a heating wire, at least a portion of which is located in the sealing injection molding glue (7).

5. The built-in over-temperature and over-current protector according to claim 1, characterized in that: It also comprises a moving contact (8), which is fixedly connected to one end of the bimetallic element (1) and is used to contact the stationary contact (2).

6. The built-in over-temperature and over-current protector according to claim 1, characterized in that: It also comprises a PTC element (9) and an external terminal (10), wherein the PTC element (9) is electrically connected between the bimetal element (1) and the external terminal (10).

7. The built-in over-temperature and over-current protector according to claim 6, characterized in that: It also comprises a steel card (11) which is fixedly arranged on the base plate (3), and the PTC element (9) is connected to the steel card (11).

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