WO2015196320A1

WO2015196320A1 - Thermostat with reliable electrical connection and assembly method therefor

Info

Publication number: WO2015196320A1
Application number: PCT/CN2014/001141
Authority: WO
Inventors: 李建雄
Original assignee: 广东福尔电子有限公司; 李建雄
Priority date: 2014-06-24
Filing date: 2014-12-19
Publication date: 2015-12-30
Also published as: CN104064401A; CN104064401B

Abstract

A thermostat with a reliable electrical connection and an assembly method therefor, which are intended to improve the reliability of electrical connections of a movable contact (8), a stationary contact (7) and a connection terminal. In the thermostat with a reliable electrical connection, a stationary contact piece and a first connection terminal (12) compress the inner and outer sides of a housing (1) via a first rivet (10); a shrapnel (9) in a movable contact component and a second connection terminal (13) compress the inner and outer sides of the housing (1) via a second rivet (11). At least one of the first rivet (10) and the second rivet (11) has a nailing direction which is from the outer side of the housing to the inner side of the housing. The second rivet (11) is in an interference fit with the installation hole of the shrapnel (9) in a movable contact component and/or the first rivet (10) is in an interference fit with the installation hole of a fixed joint board (6). In the premise of convenient assembly, the reliability of electrical connections between the shrapnel and the connection terminal and between the fixed joint board and the connection terminal is improved, the working of the thermostat is more reliable and its service life is also prolonged.

Description

Staggered thermostat with reliable electrical connection and assembly method thereof

Technical field

The invention belongs to the technical field of household appliances, and particularly relates to a snap-type thermostat with reliable electrical connection and an assembly method thereof.

Background technique

The sudden-type thermostat used in the existing household appliances is mainly used for temperature control, overheat protection, etc., as shown in Fig. 1, the connection of the moving contact, the static contact assembly and the terminal of the snap-type thermostat product The shell is elastically deformed and tightened by the riveting pressure of the rivet respectively. Since the nail head is riveted in the housing, the nail head can prevent the nail body from expanding and can cooperate with the elastic piece and the fixed plate. If the interference fits in advance, the assembly is performed. Because the thickness of the shrapnel is only about 0.2, it is easy to loosen during the assembly process. Therefore, after long-term repeated hot and cold work, the tension will gradually become smaller and the contact resistance becomes larger, which affects the product life.

Patent No. 98200816.3 discloses a "slewing type thermostat with a rivet sleeve", which is provided with a rivet sleeve on a rivet as a connecting member of a current-carrying element, the two ends of which are respectively connected with the bottom of the contact assembly and the terminal Pick up. In a high temperature environment, even if the elastic force of the housing is relaxed, the current-carrying elements can still be well connected by the rivet sleeve. Although the above solution solves the problem of loosening of the rivet, the procedure of installing the rivet sleeve is increased, the cost is increased, the nail sleeve is easily missed, the assembly is not convenient, and the mold is easily damaged, and the application is currently not much.

Summary of the invention

The object of the present invention is to provide a snap-on thermostat with reliable electrical connection and a method of assembling the same to improve the electrical connection reliability of the movable contact, the static contact and the terminal.

The electrical connection reliable snap-type thermostat of the invention comprises a casing, an aluminum cover, a guide frame, a bimetal disc, an action rod, a static contact piece formed by a fixed plate and a static contact, and a movable contact, a movable contact assembly composed of a spring piece, a first rivet, a second rivet, a first connection terminal, and a second connection terminal; the static contact piece and the first connection terminal are pressed on the inner and outer sides of the housing by the first rivet, The elastic piece and the second terminal in the movable contact assembly are pressed on the inner and outer sides of the housing by the second rivet; the key is that at least one of the first rivet and the second rivet is bent from the outside of the housing In the housing, the second rivet and the spring mounting hole in the movable contact assembly are in an interference fit and/or the first rivet and the fixed plate mounting hole are in an interference fit.

Since the first rivet and the second rivet are in the riveting process, the tail end of the nail expands to cooperate with the mounting hole of the elastic piece or the fixed plate, thereby greatly increasing the contact area and making the second rivet and the movable contact assembly Between the shrapnel and between the first rivet and the mounting hole of the fixed plate, the tensioning force of the rivet is no longer used to ensure the electrical connection. Reliance, but increase the interference fit between the nail body and the mounting hole of the rivet to ensure the reliability of the electrical connection, thus reducing the influence of the thickness variation of the housing due to temperature changes on the reliability of the electrical connection, thereby improving the The reliability of the overall electrical connection.

Further, in order to improve the reliability of electrical connection between the rivet and the terminal, the mounting hole of the first rivet and the first terminal is an interference fit and/or the mounting hole of the second rivet and the second terminal is Fit.

For ease of installation, the first rivet and the second rivet are variable diameter rivets, and the outer diameter of the nail body at the nail end of the variable diameter rivet is larger than the outer diameter of the nail body at the tail end of the nail.

The assembling method of the above-mentioned electrical connection reliable snap-type thermostat includes the steps of assembling the movable contact assembly, the step of installing the static contact piece and the first connection terminal, the step of installing the movable contact assembly and the second connection terminal, the step of fitting the lever, and placing The key to the bimetal disc step, the capping step, and the detection step are:

The step of installing the movable contact assembly and the second terminal is as follows: the second rivet is passed through the mounting hole of the second terminal by the rivet machine, and the second rivet is interference-fitted with the mounting hole of the second terminal, and The second rivet head is in close contact with the second terminal, and then the movable contact assembly is placed in the housing, and then the second rivet is sequentially riveted from the outer wall to the inner side of the housing wall and the movable contact assembly, thereby riveting The elastic piece and the second terminal of the movable contact assembly are pressed to the inner and outer sides of the housing by the second rivet.

Further, in the step of installing the movable contact assembly and the second terminal, after the second rivet head is in close contact with the second terminal, the periphery of the mounting hole of the second terminal is punched, so that the second terminal The mounting hole is interference-fitted with the second rivet body to ensure reliable connection of the second terminal to the second rivet.

The step of installing the static contact piece and the first connecting terminal is as follows: the first rivet is passed through the mounting hole of the first terminal by the rivet machine, and the first rivet is interference-fitted with the mounting hole of the first terminal, and the first a rivet head is in close contact with the first terminal, and then the static contact piece is placed in the housing, and then the first rivet is sequentially riveted from the outer side to the inner side through the housing wall and the fixed contact plate in the static contact piece, thereby riveting The fixing plate and the first terminal of the static contact piece are pressed by the first rivet to the inner and outer sides of the housing.

Further, in the step of installing the static contact piece and the first terminal, after the first rivet head is in close contact with the first terminal, the periphery of the mounting hole of the first terminal is punched, so that the first terminal is The mounting hole is interference-fitted with the first rivet body to ensure reliable connection of the first terminal to the first rivet.

The steps of assembling the movable contact assembly, the step of arranging the rod, the step of placing the bimetal disc, the step of covering the cover, and the detecting step are the same as those of the conventional electrical connection with a reliable snap-on thermostat, and are not described herein again.

The electrical connection reliable snap-type thermostat of the invention improves the shrapnel and the fixed joint under the premise of convenient assembly The reliability of the electrical connection between the board and the terminal block makes the work of the snap-on thermostat more reliable and improves its service life. At the same time, since the rivet and the terminal terminal are easily assembled and automated, there is no conventional assembly. The needle is simple, the mold life is increased from 2-4 hours to half a month, which greatly saves maintenance costs.

DRAWINGS

1 is a schematic structural view of a snap-on thermostat in the prior art.

2 is a schematic structural view of a snap-type thermostat of the present invention.

detailed description

The specific embodiments of the present invention, such as the shape and structure of the components involved, the mutual position and connection relationship between the parts, the functions and working principles of the parts, etc., are further described below with reference to the accompanying drawings. Detailed description.

Example 1:

As shown in FIG. 2, the electrical connection reliable snap-type thermostat of the present embodiment comprises a housing 1, an aluminum cover 2, a guide frame 3, a bimetal disc 4, an action rod 5, a fixed plate 6, and a static a static contact piece formed by the contact 7, a movable contact assembly composed of the movable contact 8, the elastic piece 9, a first rivet 10, a second rivet 11, a first terminal 12, and a second terminal 13, the action lever 5 is mounted in the guide frame 3, the end of the action rod 5 faces the elastic piece 9; the bimetal disc 4 is located between the aluminum cover 2 and the action rod 5; the static contact piece, the first connection terminal 12 passes the first The rivet 10 is pressed against the inner and outer sides of the casing 1. The elastic piece 9 and the second terminal 13 of the movable contact assembly are pressed against the inner and outer sides of the casing 1 by the second rivet 11; A rivet 10 and a second rivet 11 are both lead-shaped variable diameter rivets, and the outer diameter of the nail body of the first rivet 10 and the second rivet 11 is larger than the outer diameter of the nail end of the nail; the first rivet 10 and the fixed plate The mounting hole of the 6 and the mounting hole of the first terminal 12 are all an interference fit, and the mounting hole and the second wire of the elastic piece 9 in the second rivet 11 and the movable contact assembly The mounting holes of the terminals 13 are all interference fits.

The step of installing the static contact piece and the first terminal is as follows: the first rivet 10 is passed through the mounting hole of the first terminal 12 by a rivet machine, and the first rivet 10 and the mounting hole of the first terminal 12 are interspersed. Cooperating, and the first rivet 10 nail head is in close contact with the first terminal 12, and then the static contact piece is placed in the casing 1, and then the first rivet 10 is sequentially passed from the outside to the inside through the wall of the casing 1 and the static contact piece. The fixing plate 6 in the middle is riveted, thereby setting the static contact piece The connecting plate 6 and the first connecting terminal 12 are pressed against the inner and outer sides of the casing 1 by the first rivet 10;

The steps of installing the movable contact assembly and the second terminal are as follows: the second rivet 11 is passed through the mounting hole of the second terminal 13 by a rivet machine, and the mounting holes of the second rivet 11 and the second terminal 13 are passed. Fitted, and the second rivet 11 nail head is in close contact with the second terminal 13 , and then the movable contact assembly is placed in the housing 1 , and then the second rivet 11 is sequentially passed from the outside to the inside through the wall of the housing 1 The elastic piece 9 of the contact assembly is riveted, so that the elastic piece 9 and the second terminal 13 of the movable contact assembly are pressed against the inner and outer sides of the casing 1 by the second rivet 11.

The steps of assembling the movable contact assembly, the step of arranging the rod, the step of placing the bimetal disc, the step of covering the cover, and the detecting step are the same as those of the conventional snap-type thermostat, and are not described herein again.

Example 2:

In the step of installing the movable contact assembly and the second terminal 13 in this embodiment, after the second rivet 11 is attached to the second terminal 13 and then the periphery of the mounting hole of the second terminal 13 is punched, The second terminal 13 mounting hole is caused to have an interference fit with the second rivet 11 nail body, so that the connection between the second terminal 13 and the second rivet 11 can be ensured.

In the step of installing the static contact piece and the first terminal 12 in this embodiment, after the first rivet 10 is attached to the first terminal 12, the periphery of the mounting hole of the first terminal 12 is punched, thereby The mounting hole of the first terminal 12 is in interference fit with the first rivet 10, so that the connection of the first terminal 12 to the first rivet 10 is ensured.

The structure and other installation steps of the electrical connection reliable snap-on thermostat of this embodiment are the same as those of the first embodiment, and are not described herein again.

Claims

A snap-on thermostat with reliable electrical connection, comprising a casing, an aluminum cover, a guide frame, a bimetal disc, an action rod, a static contact piece formed by a fixed plate, a static contact, and a movable contact, a movable contact assembly composed of a spring piece, a first rivet, a second rivet, a first connection terminal, and a second connection terminal; the static contact piece and the first connection terminal are pressed on the inner and outer sides of the housing by the first rivet, The elastic piece and the second terminal in the movable contact assembly are pressed against the inner and outer sides of the housing by the second rivet; wherein at least one of the first rivet and the second rivet is in a direction from the shell In the outer casing, the second rivet and the spring mounting hole in the movable contact assembly are in an interference fit and/or the first rivet and the fixed plate mounting hole are in an interference fit.
The electrical connection reliable snap-on thermostat according to claim 1, wherein the first rivet and the mounting hole of the first terminal are an interference fit and/or the second rivet and the second terminal The mounting holes are an interference fit.
The jumper thermostat with reliable electrical connection according to claim 1 or 2, wherein the first rivet and the second rivet are variable diameter rivets, and the outer diameter of the nail end of the variable diameter rivet is greater than The outer diameter of the nail at the end of the nail.
The assembling method of the electrical connection reliable snap-type thermostat according to claim 1, comprising the steps of assembling the movable contact assembly, installing the static contact piece and the first connection terminal step, and mounting the movable contact assembly and the second connection terminal Step, a step of placing a rod, a step of placing a bimetal disc, a step of capping, and a step of detecting, wherein the step of mounting the movable contact assembly and the second terminal is as follows: the second rivet is passed through the second wire by a rivet machine a mounting hole of the terminal, and an interference fit between the second rivet and the mounting hole of the second terminal, and the second rivet head is in close contact with the second terminal, and then the movable contact assembly is placed in the housing, and then The second rivet is sequentially riveted through the housing wall and the elastic piece of the movable contact assembly from the outside to the inside, so that the elastic piece and the second terminal of the movable contact assembly are pressed against the inner and outer sides of the housing by the second rivet.
The assembling method of the electrical connection reliable snap-on thermostat according to claim 4, wherein in the step of installing the movable contact assembly and the second connecting terminal, the second rivet head is closely attached to the second After the terminal is connected, the periphery of the mounting hole of the second terminal is punched, so that the second terminal mounting hole is interference-fitted with the second rivet body.
The assembling method of the electrical connection reliable snap-type thermostat according to claim 4 or 5, wherein the step of installing the static contact piece and the first connecting terminal is as follows: the first rivet is passed through the rivet machine a mounting hole of the terminal, and the first rivet is interference-fitted with the mounting hole of the first terminal, and the first rivet head is in close contact with the first terminal, and then the static contact piece is placed in the housing, and then First rivet from the outside to the inside After the fixing plate in the wall of the housing and the static contact piece is riveted, the fixing plate and the first terminal of the static contact piece are pressed by the first rivet to the inner and outer sides of the housing.
The assembling method of the electrical connection reliable snap-type thermostat according to claim 6, wherein in the step of installing the static contact piece and the first connecting terminal, the first rivet nail head is closely attached to the first wiring After the terminal, the periphery of the mounting hole of the first terminal is punched, so that the mounting hole of the first terminal is interference-fitted with the first rivet body.