CN104217895A - Shrapnel-type power-off reset temperature control switch that can control multiple load circuits - Google Patents

Abstract

The utility model provides a steerable many load circuit's shell fragment formula outage temperature detect switch that resets, this temperature detect switch includes metal casing, is fixed in metal casing's a plurality of binding post and metal end cover, locates the ceramic leading truck heat-generating body between metal end cover and the metal casing, and the ceramic ejector pin of putting on the ceramic leading truck heat-generating body is worn in the activity, with the bimetallic strip of ceramic ejector pin contact and the movable elastic sheet that is equipped with the movable contact, be equipped with the static contact and the lower contact of stationary contact. When the load temperature reaches a set value, the bimetallic strip is heated to jump suddenly, so that the movable contact and the fixed contact are separated to break a circuit. The other side of the movable contact is closed and conducted with the lower contact, so that the heating body of the ceramic guide frame is electrified and heated, and the bimetallic strip and the temperature control switch circuit are maintained in a disconnected state. The bimetallic strip can be reset to switch on the temperature control switch circuit only when the power supply is disconnected, and the ceramic guide frame heating body circuit is disconnected.

Description

Shrapnel-type power-off reset temperature control switch that can control multiple load circuits

【Technical field】

The invention relates to a temperature control device for electrical products, in particular to a shrapnel-type power-off reset temperature control switch capable of controlling multiple load circuits, which can simultaneously control multiple load circuits and has power-off protection and power-off reset functions.

【Background technique】

At present, various electrical appliances are widely used in people's lives, bringing convenience to people's lives. The safety of electrical equipment, especially electric heating equipment, is an important issue to be considered in product design and production. When the components or electronic circuits of electrical equipment fail, it will cause the equipment to heat up and the temperature will rise. When the temperature exceeds the normal value, it will cause equipment failure, thus affecting the normal use of the equipment. For this reason, general electrical appliances or electronic equipment are equipped with temperature switches or thermostats, so that when the temperature of the equipment exceeds the normal value, the power supply is cut off to protect the safety of the equipment. However, the existing mechanical jump thermostats only have basic power-off protection functions, and can only control the temperature of a single load circuit, so their use is limited. On the other hand, many of these thermostats are automatically reset according to the temperature, so that some equipment has been automatically reset without eliminating the hidden danger of failure, so there is the possibility of failure again and potential safety hazards.

【Content of invention】

The present invention aims to solve the above problems, and provides a shrapnel-type power-off reset that can control multiple load circuits at the same time, has the functions of power-off protection and power-off reset, has a simple structure, is safe and reliable, and can control multiple load circuits. thermal control.

In order to achieve the above object, the present invention provides a shrapnel type power-off reset temperature control switch capable of controlling multiple load circuits. Body, bimetallic strip, moving shrapnel, static contact piece and lower contact, among them, multiple terminals are fixed on the bottom of the metal shell, and the metal end cover is fixed on the open end of the metal shell, between the metal end cover and the metal shell There is a ceramic guide frame heating element, and a ceramic ejector rod is movable on the ceramic guide frame heating element. The two ends of the ceramic ejector rod are respectively in contact with the bimetallic sheet and the moving shrapnel. The other end of the piece is in contact with the electrode of the heating element of the ceramic guide frame, and a static contact piece is fixed in the metal shell. The static contact piece is provided with a static contact point corresponding to the moving contact point of the moving shrapnel, and the static contact piece The end of the sheet away from the static contact is in contact with the electrode of the heating element of the ceramic guide frame, and a lower contact is provided on the metal shell at a position corresponding to the movable contact, and

When the load temperature reaches the set value, the bimetal jumps suddenly when it is heated, and pushes the ceramic ejector rod to move, so that the moving contact of the moving shrapnel is separated from the static contact of the static contact, and the moving contact of the moving shrapnel is separated from the static contact. The other side of the contact is closed and conducted with the lower contact, so that the heating element of the ceramic guide frame is energized and heated so that the bimetal is kept in the disconnected state, and the temperature control switch circuit is in the disconnected state. After opening, the heating body of the ceramic guide frame stops heating, and when the temperature drops to a normal value, the bimetal sheet resets, so that the moving contact of the moving shrapnel and the static contact of the static contact are closed, and the temperature control switch circuit is turned on and off. Open the heating element circuit of the ceramic guide frame.

The moving shrapnel includes a U-shaped shrapnel body and a contact shrapnel formed by extending from the bending part of the shrapnel body to the other side. One end of the shrapnel body is riveted and fixed with the metal shell, and its free end is provided with a moving contact. The free end of the contact shrapnel It is in contact with the electrode of the heating element of the ceramic guide frame.

The movable contact is a T-shaped contact composed of a horizontal part and a vertical part, the horizontal part is in contact with or separated from the static contact, and the vertical part passes through the moving elastic piece and is in contact with or separated from the lower contact.

One end of the static contact piece is provided with a static contact, and the other end is bent, and the end of the bent end is in contact with the electrode of the heating element of the ceramic guide frame.

The lower contact is formed by a rivet, one end of the cap of the rivet forms the lower contact, and the other end of the rivet passes through the metal shell to rivet and fix one of the terminals.

The metal shell is a hollow columnar body, and its open end is provided with an outwardly protruding edge, and the bottom of the metal shell is provided with three grooves distributed at intervals of 90 degrees for installing terminal blocks.

At the bottom of the metal case are fixed three connection terminals that can connect three load circuits. The three connection terminals are arranged in three grooves at the bottom of the metal case at intervals of 90 degrees. One end of each connection terminal is riveted and fixed with the metal case, and the other One end extends beyond the metal housing.

The ceramic guide frame heating element includes a ceramic guide frame, a heating film arranged on the ceramic guide frame and electrodes connected to the heating film. The ceramic guide frame is a circular plate-shaped body, and the side opposite to the metal end cover is provided The concave surface of the bimetal sheet is accommodated, and the edge of the ceramic guide frame is provided with an annular L-shaped step matched with the metal shell.

The contribution of the present invention is that it effectively solves the problems that the existing thermostat can only control a single load, has a single function, and has low use efficiency. The temperature control switch of the present invention can control multiple load circuits at the same time, thus effectively improving the use efficiency of the temperature control switch and saving production cost. Since the present invention is provided with a movable shrapnel and a static contact piece that are in contact with or separated from the electrodes of the ceramic guide frame, it can realize the conduction or disconnection of the heating circuit of the ceramic guide frame with a simple and reliable mechanical structure, so that the temperature controller responds more sensitively. work more reliably. In addition to the basic power-off protection function of the temperature control switch, the invention also has a power-off reset function, so it is beneficial to eliminate hidden troubles in time and greatly improves the safety of electrical equipment. The invention also has the characteristics of simple structure, small volume, reliable operation and the like.

【Description of drawings】

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a cross-sectional view of the structure along the line A of Fig. 1 .

Fig. 3 is a cross-sectional view of the structure taken along direction B in Fig. 1 .

Fig. 4 is a schematic structural view of the ceramic guide frame of the present invention.

Fig. 5 is a schematic diagram of the structure of the moving spring of the present invention.

Fig. 6 is a schematic diagram of the structure of the static contact piece of the present invention.

【Detailed ways】

The following examples are further explanations and illustrations of the present invention, and do not constitute any limitation to the present invention.

Referring to Figures 1 to 3, the shrapnel type power-off reset temperature control switch capable of controlling multiple load circuits of the present invention includes a metal shell 10, a plurality of connection terminals 20, a metal end cover 30, a ceramic guide frame heating element 40, and a bimetallic sheet 50, moving shrapnel 60, static contact piece 70 and lower contact 80.

As shown in Figures 1 to 3, the metal shell 10 is a copper hollow cylinder with one end open, and the open end is provided with a protruding edge 11 for connecting the ceramic guide frame Heating body 40. There are three grooves 12 on the bottom of the metal shell 10 for installing the connection terminals, and the three grooves 12 are distributed on the cross center line at the bottom of the metal shell 10 at intervals of 90 degrees.

As shown in FIG. 1 , a plurality of connection terminals 20 are fixed on the bottom of the metal casing 10 , and they can be respectively connected to a plurality of different load circuits. In this embodiment, three connection terminals 20 are fixed on the bottom of the metal casing 10, which can be used to connect three different load circuits. Three connection terminals 20 are arranged in the three grooves 12 at the bottom of the metal casing at intervals of 90 degrees, and each wire terminal 20 is riveted and fixed to the metal casing by rivets. One end of each connection terminal 20 is riveted and fixed to the metal casing 10 , and the other end extends out of the metal casing. Different load circuits can be respectively connected to the three connection terminals 20 by conventional methods. As shown in FIG. 2 and FIG. 3 , an aluminum metal end cover 30 is provided at the open end of the metal shell 10 , and the metal end cover 30 is fixed to the metal shell 10 with screws.

In Fig. 2 and Fig. 3, there is a ceramic guide frame heating element 40 between the metal end cover 30 and the metal shell 10, which is used for the temperature control switch to be turned on and generate heat when the load circuit is cut off due to overtemperature, so that the bimetal Sheet 50 and temperature control switch circuit are in off state. As shown in FIGS. 2 to 4 , the ceramic guide frame heating element 40 includes a ceramic guide frame 41 , a heating film 42 arranged on the ceramic guide frame and electrodes 43 connected to the heating film. The ceramic guide frame 41 is a circular plate-shaped body corresponding to the shape of the open end of the metal shell 10, and the side of the ceramic guide frame opposite to the metal end cover 30 is provided with a concave surface 411 for accommodating the bimetallic sheet. The edge of the ceramic guide frame 41 is provided with an annular L-shaped step 412 mated with the metal casing, through which the annular L-shaped step 412 is mated and connected with the open end of the metal casing. A heating film 42 is provided on the lower surface of the ceramic guide frame 41 , and two fan-shaped electrodes 43 are provided on the heating film 42 . In the center of the ceramic guide frame 41 is provided a central hole 413 for piercing the ceramic push rod 44 . A ceramic ejector rod 44 is movably pierced in the center hole 413 of the ceramic guide frame. One end of the ceramic ejector rod 44 is in contact with the bimetal 50 , and the other end is in contact with the moving spring 60 .

As shown in Fig. 2 and Fig. 3, a bimetal 50 is arranged between the metal end cover 30 and the heating element 40 of the ceramic guide frame. The ejector rod 44 is in contact with each other, and is used to push the ceramic ejector rod 44 to move to the other side when the load temperature exceeds a set value and is deformed by heat.

In Fig. 2 and Fig. 3, the other end of the ceramic push rod 44 is in contact with the moving elastic piece 60. The structure of the moving elastic piece 60 is shown in Fig. 5, which includes a U-shaped elastic piece main body 61 and a contact elastic piece 62, wherein the elastic piece One end of the main body 61 is a connecting end, and the other end is a free end. As shown in FIG. 2 , the connection end of the spring body 61 is riveted and fixed to the bottom of the metal casing 10 with a rivet 64 , and the free end of the spring body 61 is provided with a movable contact 63 . The movable contact 63 is a T-shaped contact composed of a transverse portion 631 and a vertical portion 632, the transverse portion 631 is in contact with or separated from the static contact 71, and the vertical portion 632 passes through the movable elastic piece 60 and is in contact with the The lower contacts 80 make contact or separate. The bending part of the main body 61 of the shrapnel is bifurcated and extended to the other side to form a contact shrapnel 62, and the free end of the shrapnel 62 forms a U-shaped bend, so as to increase the contact area with the electrode 43 of the heating element of the ceramic guide frame . The contact elastic piece 62 conducts electricity through its U-shaped bent end in contact with the electrode 43 of the heating element of the ceramic guide frame.

As shown in Fig. 2 and Fig. 3, a static contact piece 70 is also provided in the metal casing 10, and the structure of the static contact piece 70 is shown in Fig. The static contact 71 corresponding to the movable contact 63 of the moving elastic piece, the other end of the static contact piece 70 forms a bend, and the end of the bent end is provided with a small U-shaped bend, and the static contact piece 70 passes through it. The U-shaped bend at the end is in contact with the electrode 43 of the heating element of the ceramic guide frame to conduct electricity.

As shown in Figure 2, a lower contact 80 is provided at the bottom of the metal shell 10 at a position corresponding to the movable contact 63, which is used for the movable contact 63 and the static contact 71 of the temperature control switch when the load is overheated. When separated, it contacts with the movable contact 63 to conduct the heating circuit of the heating element 40 of the ceramic guide frame. The lower contact 80 is formed by a rivet. One end of the cap 81 of the rivet forms the lower contact, and the other end of the rivet passes through the bottom of the metal casing to rivet and fix one of the terminals 20 .

The working principle of the present invention is shown in Fig. 2 and Fig. 3 . When the load temperature reaches the set value, the bimetal strip 60 is heated and jumps suddenly, pushing the ceramic push rod 41 to move to the other side, and the other end of the ceramic push rod 41 pushes the movable shrapnel 60 to move, so that the movable contact 63 It is separated from the static contact 71 to disconnect the load circuit to protect the load from power failure. At this time, the other side of the moving contact 63 separated from the static contact 71 is closed with the lower contact 80 to conduct, and the contact elastic piece 62 of the moving elastic piece and the static contact piece 70 are connected with the heating element of the ceramic guide frame. The electrodes 43 are in contact, so that the heating element 40 of the ceramic guide frame is energized to generate heat, so that the bimetal 50 is always kept in the off state, and the temperature control switch circuit is in the off state, which plays a role of power-off protection for the load. In this case, only when the fault of the load is completely eliminated and the power supply is disconnected, the heating element 40 of the ceramic guide frame stops heating. The static contact 71 is closed to conduct the temperature control switch circuit. At this time, one end of the contact shrapnel 62 and the static contact piece 70 of the moving shrapnel is separated from the electrode 43 of the heating element of the ceramic guide frame, and thus the circuit of the heating element of the ceramic guide frame is disconnected, and at the same time, the power-off protection and protection of the load are realized. Power-off reset function.

Although the present invention has been disclosed through the above embodiments, the protection scope of the present invention is not limited thereto. Under the condition of not departing from the concept of the present invention, the deformation, replacement, etc. of the above components will fall into the scope of the present invention. within the scope of the claims.

Claims (8)

1. A shrapnel type power-off reset temperature control switch capable of controlling multiple load circuits, characterized in that the temperature control switch includes a metal shell (10), a plurality of terminals (20), a metal end cover (30), ceramic Guide frame heating element (40), bimetal sheet (50), moving elastic sheet (60), static contact sheet (70) and lower contact (80), wherein, a plurality of connection terminals (20) are fixed on the metal shell (10 ) bottom, the metal end cover (30) is fixed on the open end of the metal shell (10), and the ceramic guide frame heating element (40) is arranged between the metal end cover (30) and the metal shell (10), and the ceramic guide frame A ceramic mandrel (44) is movably placed on the heating element (40), and the two ends of the ceramic mandrel (44) are respectively in contact with the bimetallic sheet (50) and the moving shrapnel (60). The contact (63), the other end of the moving shrapnel (60) is in contact with the electrode (43) of the ceramic guide frame heating element, and the static contact piece (70) is also fixed in the metal shell (10). There is a static contact (71) corresponding to the moving contact of the moving shrapnel, and the end of the static contact (70) away from the static contact is in contact with the electrode (43) of the heating element of the ceramic guide frame. (10) is provided with a lower contact (80) at a position corresponding to the movable contact (63), and When the load temperature reaches the set value, the bimetal strip (60) is heated and jumps suddenly, pushing the ceramic ejector rod (41) to move, so that the moving contact point (63) of the moving shrapnel and the static contact point of the static contact piece (71) is separated, and the other side of the movable contact (63) separated from the static contact (71) is closed and conducted with the lower contact (80), so that the ceramic guide frame heating element (40) is energized and heated so that The bimetal sheet (50) is maintained in the disconnected state, and the temperature control switch circuit is in the disconnected state. Only after the power supply is disconnected, the ceramic guide frame heating element (40) stops heating, and when the temperature drops to a normal value, the bimetal Sheet (50) resets, makes the moving contact (63) of moving shrapnel and the static contact (71) of static contact sheet close and makes temperature control switch circuit conduction, and disconnects ceramic guide frame heating element circuit. 2. The shrapnel type power-off reset temperature control switch capable of controlling multiple load circuits according to claim 1, wherein the moving shrapnel (60) includes a U-shaped shrapnel body (61) and a shrapnel body (61) ) is extended to the other side to form a contact shrapnel (62), one end of the shrapnel main body (61) is riveted and fixed with the metal casing (10), and its free end is provided with a movable contact (63), the contact shrapnel (62 ) is in contact with the electrode (43) of the ceramic guide frame heating element. 3. The shrapnel type power-off reset temperature control switch capable of controlling multiple load circuits according to claim 2, characterized in that, the movable contact (63) is composed of a horizontal part (631) and a vertical part (632) Formed T-shaped contact, its horizontal part (631) is in contact with or separated from the static contact (71), and its vertical part (632) passes through the moving spring (60) and contacts with the lower contact (80) or separation. 4. The shrapnel type power-off reset temperature control switch capable of controlling multiple load circuits as claimed in claim 1, wherein one end of the static contact piece (70) is provided with a static contact (71), and the other end thereof is A bend is formed, and the end of one end of the bend is in contact with the electrode (43) of the heating element of the ceramic guide frame. 5. The shrapnel-type power-off reset temperature control switch capable of controlling multiple load circuits according to claim 1, wherein the lower contact (80) is formed by a rivet, and one end of the rivet (81) is A lower contact is formed, and the other end thereof passes through the metal shell to rivet and fix one of the connection terminals (20). 6. The shrapnel type power-off reset temperature control switch capable of controlling multiple load circuits as claimed in claim 1, characterized in that, the metal casing (10) is a hollow column, and its open end is provided with an outward The protruding edge (11) and the bottom of the metal casing are provided with three grooves (12) distributed at intervals of 90 degrees for installing connection terminals. 7. The shrapnel type power-off reset temperature control switch capable of controlling multiple load circuits as claimed in claim 6 is characterized in that three connection terminals (20) that can connect three load circuits are fixed on the bottom of the metal casing (10) ), three connection terminals (20) are arranged in three grooves (12) at the bottom of the metal casing at intervals of 90 degrees, one end of each connection terminal (20) is riveted and fixed with the metal casing (10), and the other end extends to the metal casing (10). outside the shell. 8. The shrapnel type power-off reset temperature control switch capable of controlling multiple load circuits as claimed in claim 1, characterized in that, the ceramic guide frame heating element (40) includes a ceramic guide frame (41), which is arranged on the ceramic guide frame. The heating film (42) on the frame and the electrode (43) connected with the heating film, the ceramic guide frame (41) is a circular plate-shaped body, and its side opposite to the metal end cover (30) is provided with accommodating The concave surface (411) of the bimetal sheet and the edge of the ceramic guide frame (41) are provided with an annular L-shaped step (412) matched with the metal shell.