A normally closed snap-action thermostat

Abstract

The present invention discloses a normally closed snap-action thermostat, comprising: a housing, a temperature sensing cover, a first terminal, a second terminal, a moving spring, a first action disc, a second action disc, a guide frame and a push rod. The temperature sensing cover is connected to the housing and encloses a space, and the guide frame divides the space enclosed by the housing and the temperature sensing cover into a temperature sensing chamber and a containing chamber; the action temperature of the first action disc is greater than the action temperature of the second action disc, and the reset temperature of the first action disc is less than the reset temperature of the second action disc. This thermostat increases the upper limit of the heating element through the first action disc, so that the heating element can reach a higher temperature during the initial heating, so that there is more heat to reduce the temperature. Under the condition of the same heat dissipation rate, the second action disc can jump less times, so that the heating element reaches a constant temperature state more quickly. The efficiency of temperature control is improved. This thermostat is mainly used in the field of temperature control technology.

Description

Technical Field

[0001] The invention relates to the technical field of temperature control, and in particular to a normally closed snap-action temperature controller. Background Art

[0002] The existing sudden jump thermostat is widely used and is used in almost all heating appliances. However, when the existing sudden jump thermostat is used in an environment with a rapid temperature rise, it will cause the thermostat to jump prematurely. This premature jump is not conducive to quickly making the heat extractor reach the target temperature. Therefore, the structural temperature control efficiency of the existing thermostat is not high. Summary of the invention

[0003] The object of the present invention is to provide a normally closed snap-action thermostat to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The solution of the present invention to solve the technical problem is: to provide a normally closed snap-action thermostat, comprising: a housing, a temperature sensing cover, a first terminal, a second terminal, a moving spring, a first action disc, a second action disc, a guide frame and a push rod, wherein the temperature sensing cover is connected to the housing and encloses a space, and the guide frame divides the space enclosed by the housing and the temperature sensing cover into a temperature sensing cavity and a receiving cavity, wherein the temperature sensing cavity is close to the temperature sensing cover, and the receiving cavity is close to the housing;

[0005] The movable spring piece is arranged inside the accommodating cavity, the first terminal and the second terminal are both arranged outside the accommodating cavity, the first terminal fixes one end of the movable spring piece to the cavity wall of the accommodating cavity through a first rivet, and the second terminal is fixedly connected to the cavity wall of the accommodating cavity through a second rivet;

[0006] The cavity wall of the accommodating cavity is provided with a high part and a bottom part, one end of the movable spring is fixed on the high part, the other end of the movable spring is extended horizontally and is located above the bottom part, the other end of the movable spring is provided with a movable contact, the movable contact is arranged downward relative to the bottom part, the second rivet is provided with a static contact, the static contact is arranged upward relative to the bottom part, and the movable contact is in contact with the static contact;

[0007] The first action disc and the second action disc are both arranged inside the temperature sensing chamber, and the first action disc and the second action disc are stacked up and down, wherein the second action disc is located below the first action disc and close to the action spring;

[0008] A guide through hole is provided in the middle of the guide frame, the lower end of the push rod passes through the guide through hole and is abutted against the middle of the moving spring sheet, the upper end of the push rod is abutted against the second actuating disc, the actuating temperature of the first actuating disc is greater than the actuating temperature of the second actuating disc, and the reset temperature of the first actuating disc is lower than the reset temperature of the second actuating disc.

[0009] Furthermore, a convex point is provided in the middle of the movable spring sheet, and the convex point is in abutment with the other end of the push rod.

[0010] Furthermore, the temperature sensing cover is connected to the outer shell by rolling and closing the edges around it.

[0011] Furthermore, the temperature sensing cover is made of aluminum.

[0012] Furthermore, the first action disc is a bimetallic structure.

[0013] Furthermore, the second action disc is a bimetallic structure.

[0014] Furthermore, the first wiring terminal is provided with a first wiring hole.

[0015] Furthermore, the second wiring terminal is provided with a second wiring hole.

[0016] The beneficial effects of the present invention are as follows: by constructing a normally closed structure, the thermostat can be used in normally closed application scenarios. At the same time, the upper limit of the heating element is increased by the first action disc, so that the heating element can reach a higher temperature during the initial heating, so that there is more heat to reduce the temperature. Under the same heat dissipation rate, the second action disc can jump less times, so that the heating element can reach a constant temperature state more quickly. The efficiency of temperature control is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the structure of a normally closed snap-action thermostat when it is closed;

[0019] Figure 2 It is a schematic diagram of the structure of the normally closed snap-action thermostat when it is disconnected.

[0020] Figure 1 and Figure 2 The arrows indicate up and down, respectively. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0022] refer to Figure 1 and Figure 2 , a normally closed snap-action thermostat is provided, comprising: a housing 100, a temperature sensing cover 200, a first terminal 530, a second terminal 540, a moving spring 400, a first action disc 601, a second action disc 602, a guide frame 300 and a push rod 410, wherein the temperature sensing cover 200 is connected to the housing 100 and encloses a space, and the guide frame 300 divides the space enclosed by the housing 100 and the temperature sensing cover 200 into a temperature sensing cavity and a receiving cavity, wherein the temperature sensing cavity is close to the temperature sensing cover 200, and the receiving cavity is close to the housing 100;

[0023] The movable spring piece 400 is arranged inside the accommodating cavity, and the first terminal 530 and the second terminal 540 are both arranged outside the accommodating cavity. The first terminal 530 fixes one end of the movable spring piece 400 to the cavity wall of the accommodating cavity through a first rivet 510, and the second terminal 540 is fixedly connected to the cavity wall of the accommodating cavity through a second rivet 520;

[0024] The cavity wall of the accommodating cavity is provided with a high portion 511 and a bottom portion 521, one end of the movable spring piece 400 is fixed on the high portion 511, the other end of the movable spring piece 400 is extended transversely and is located above the bottom portion 521, the other end of the movable spring piece 400 is provided with a movable contact 402, the movable contact 402 is arranged downward relative to the bottom portion 521, the second rivet 520 is provided with a static contact 403, the static contact 403 is arranged upward relative to the bottom portion 521, and the movable contact 402 is in contact with the static contact 403;

[0025] The first action disc 601 and the second action disc 602 are both arranged inside the temperature sensing chamber, and the first action disc 601 and the second action disc 602 are stacked up and down, wherein the second action disc 602 is located below the first action disc 601 and close to the moving reed 400;

[0026] A guide through hole is provided in the middle of the guide frame 300, the lower end of the push rod 410 passes through the guide through hole and is abutted against the middle of the movable spring 400, the upper end of the push rod 410 is abutted against the second action disc 602, the action temperature of the first action disc 601 is greater than the action temperature of the second action disc 602, and the reset temperature of the first action disc 601 is less than the reset temperature of the second action disc 602.

[0027] In the normal state, the thermostat is in the normally closed state, that is, the first terminal 530 and the second terminal 540 are in the conducting state. In the normal state, the first action disc 601 and the second action disc 602 are in the initial state, and the first action disc 601 and the second action disc 602 are connected to the upper end of the push rod 410, so that the lower end of the push rod 410 contacts the middle part of the moving spring 400. Since one end of the moving spring 400 is fixed, the other end of the moving spring 400 is pressed due to the force of the contact, and the moving contact 402 contacts the static contact 403. Thus, a normally closed structure is formed.

[0028] When the thermostat controls the temperature, the thermostat is electrically connected to the heating element to be controlled, that is, the heating element is connected in series with the first terminal 530 and the second terminal 540. The heating element is energized and generates heat. The temperature sensing cover 200 absorbs the heat, causing the temperature of the temperature sensing chamber to rise. Since the operating temperature of the first action disc 601 is greater than the operating temperature of the second action disc 602. When the temperature rises to the operating temperature of the second action disc 602, since the first action disc 601 has not yet moved, the first action disc 601 will suppress the second action disc 602, so that the second action disc 602 will not move. When the temperature continues to rise, when the operating temperature of the first action disc 601 is reached. The first action disc 601 moves, and the second action disc 602 moves. The force of the compression of the moving reed 400 disappears, the moving reed 400 recovers upward, and the moving contact 402 and the static contact 403 are separated. The function of powering off the heating element is realized.

[0029] When the heating element is powered off, the heat it generates decreases and the temperature starts to drop. Since the reset temperature of the first action disc 601 is lower than the reset temperature of the second action disc 602. Therefore, when the temperature drops to the reset temperature of the second action disc 602, the second action disc 602 is reset. At this time, the first action disc 601 still remains unreset, so that the second action disc 602 can independently control the push rod 410 through its reset. The control process of the push rod 410 by the second action disc 602 is manifested as a constant temperature process for the heating element. When the second action disc 602 is reset, the second action disc 602 top-connects the push rod 410, and the push rod 410 presses the moving reed 400. The moving contact 402 is brought into contact with the static contact 403. When the heating element is powered on, the temperature of the heating element rises. When the temperature rises to the operating temperature of the second action disc 602, since the first action disc 601 has not been reset, the second action disc 602 is not affected by the first action disc 601 and can freely control the push rod 410, so that the temperature of the heating element is in a dynamic equilibrium state, thereby achieving a constant temperature process.

[0030] Generally, when the temperature of the heating element is controlled, since the heating element has a certain heat dissipation rate when the power is off, the temperature of the heating element will drop. The constant temperature of the heating element is controlled in the operating temperature and reset temperature of the second action disc 602. In order to reduce the number of times the second action disc 602 jumps, the heating element reaches a constant temperature state more quickly. Therefore, the first action disc 601 is used to control the initial state of the second action disc 602. In the initial state of the thermostat, since the operating temperature of the first action disc 601 is greater than the operating temperature of the second action disc 602, the upper limit of the heating of the heating element can be increased. The heating element can reach a higher temperature during the initial heating, so that there is more heat to reduce the temperature. Under the same heat dissipation rate, the second action disc 602 can jump less times, so that the heating element reaches a constant temperature state more quickly. Improve the efficiency of temperature control.

[0031] In some preferred embodiments, a convex point 401 is provided in the middle of the movable spring piece 400 , and the convex point 401 is in abutment with the other end of the push rod 410 .

[0032] In some preferred embodiments, the temperature sensing cover 200 is connected to the housing 100 by rolling the edges all around. The temperature sensing cover 200 is more firmly connected to the housing 100 by rolling the edges all around.

[0033] In some preferred embodiments, the temperature sensing cover 200 is made of aluminum. Setting the temperature sensing cover 200 to be made of aluminum can enhance the temperature sensing capability of the temperature sensing cover 200.

[0034] In some preferred embodiments, the first action disc 601 is a bimetallic structure.

[0035] In some preferred embodiments, the second action disc 602 is a bimetallic structure.

[0036] In some preferred embodiments, the first wiring terminal 530 is provided with a first wiring hole 531 .

[0037] In some preferred embodiments, the second wiring terminal 540 is provided with a second wiring hole 541 .

[0038] The preferred embodiments of the present invention are described in detail above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A normally closed snap-action thermostat, characterized in that: include: A housing (100), a temperature sensing cover (200), a first terminal (530), a second terminal (540), a movable spring (400), a first actuating disc (601), a second actuating disc (602), a guide frame (300), and a push rod (410), wherein the temperature sensing cover (200) is connected to the housing (100) and encloses a space, and the guide frame (300) divides the space enclosed by the housing (100) and the temperature sensing cover (200) into a temperature sensing cavity and a receiving cavity, wherein the temperature sensing cavity is close to the temperature sensing cover (200), and the receiving cavity is close to the housing (100); The movable spring (400) is arranged inside the accommodating cavity, the first terminal (530) and the second terminal (540) are both arranged outside the accommodating cavity, the first terminal (530) fixes one end of the movable spring (400) to the cavity wall of the accommodating cavity via a first rivet (510), and the second terminal (540) is fixedly connected to the cavity wall of the accommodating cavity via a second rivet (520); The cavity wall of the accommodating cavity is provided with a high portion (511) and a bottom portion (521); one end of the movable spring (400) is fixed on the high portion (511); the other end of the movable spring (400) extends transversely and is located above the bottom portion (521); the other end of the movable spring (400) is provided with a movable contact (402); the movable contact (402) is arranged downward relative to the bottom portion (521); the second rivet (520) is provided with a static contact (403); the static contact (403) is arranged upward relative to the bottom portion (521); the movable contact (402) is in contact with the static contact (403); The first action disc (601) and the second action disc (602) are both arranged inside the temperature sensing chamber, and the first action disc (601) and the second action disc (602) are stacked up and down, wherein the second action disc (602) is located below the first action disc (601) and close to the moving reed (400); A guide through hole is provided in the middle of the guide frame (300), the lower end of the push rod (410) passes through the guide through hole and is in contact with the middle of the movable spring (400), the upper end of the push rod (410) is in contact with the second actuating disc (602), the actuating temperature of the first actuating disc (601) is greater than the actuating temperature of the second actuating disc (602), and the reset temperature of the first actuating disc (601) is less than the reset temperature of the second actuating disc (602); A convex point (401) is provided in the middle of the movable spring sheet (400), and the convex point (401) is in abutment with the other end of the push rod (410); The temperature sensing cover (200) is connected to the outer shell (100) by rolling the edges around the edges.

2. A normally closed snap-action thermostat according to claim 1, characterized in that: The temperature sensing cover (200) is made of aluminum.

3. A normally closed snap-action thermostat according to claim 1, characterized in that: The first action disc (601) is a bimetallic structure.

4. A normally closed snap-action thermostat according to claim 1, characterized in that: The second action disc (602) is a bimetallic structure.

5. A normally closed snap-action thermostat according to claim 1, characterized in that: The first wiring terminal (530) is provided with a first wiring hole (531).

6. A normally closed snap-action thermostat according to claim 1, characterized in that: The second wiring terminal (540) is provided with a second wiring hole (541).

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