Temperature-controlling and temperature-limiting snap-action temperature controller

Abstract

The utility model relates to a temperature-controlling and temperature-limiting snap-action temperature controller, and belongs to the technical field of snap-action temperature controllers. The temperature control bimetallic disc and the temperature limiting bimetallic disc which are the same in outer diameter are overlapped in the same direction and placed in a cavity of the sealing cover, the outer peripheries of the temperature control bimetallic disc and the temperature limiting bimetallic disc are both in contact connection with the inner periphery of the sealing cover, and the first outward face of the temperature control bimetallic disc is in contact connection with the inward plane of the sealing cover. The lower end part of the push rod is in contact connection with a second inward surface of the temperature-limiting bimetallic disc; and a spring which is sleeved on the outer sleeve wall of the central sleeve is arranged between the second inward surface of the temperature-limiting bimetallic disc and the bottom surface of the inner ring groove of the shell. The temperature controller has an automatic reset temperature control function and a manual reset temperature limiting protection function, the temperature limiting action precision is very high, the temperature limiting protection effect is very good, and meanwhile the temperature controller is simple in structure, convenient to assemble, low in production cost and high in production efficiency.

Description

A temperature control and temperature limiting snap-action thermostat Technical Field

[0001] This utility model relates to the field of snap-action temperature controllers, and in particular to a snap-action temperature controller for temperature control and limiting. Background Technology

[0002] Chinese Patent Gazette published a utility model patent with announcement number CN214672389U, entitled "An Automatic Reset Temperature Control and Manual Reset Temperature Limiting Type Snap-on Temperature Controller." Paragraphs 0018-0023 of the specification specifically disclose that: the automatic reset temperature control module mainly consists of a first bimetallic disc 3, a first actuating rod 4, a fixed contact plate 9, and a moving contact bracket 13. A moving contact 12 is fixedly mounted on the right end of the moving contact bracket 13, and a fixed contact 11 is fixedly mounted on the left end of the fixed contact plate 9. The manual reset temperature limiting module mainly consists of a second bimetallic disc 6, a second actuating rod 5, a moving contact bracket 13, and a reset handle 14. The second actuating rod 5 is sleeve-shaped, with a first lower end face 5-2 and a second lower end face 5-3 at its lower part. The bracket 7 is a hollow, flattened, round basin-shaped structure with its reverse edge 7-1 and outer periphery 7-2 respectively connected to the guide frame 2 and the housing 8.

[0003] It is evident that this technical solution has the following drawbacks: ① The automatic reset temperature control module and the manual reset temperature limiting module use a large number of parts, requiring separate setting of the first actuating rod 4 and the second actuating rod 5. The positions and connection structures of each part are relatively complex, the assembly process is complicated, and the production cost is high; ② Because the distance between the second bimetallic disc 6 (temperature limiting) and the cover 1 is relatively far, measured to be 3.4mm, and the temperature of the cover 1 needs to be transferred to the ceramic guide frame 2 first; then transferred by the ceramic guide frame 2 to the copper bracket 7, and finally transferred by the copper bracket 7 to the second bimetallic disc 6, the temperature limiting action accuracy is low. The measured temperature limiting action accuracy is about 90 seconds, that is, when the temperature of the cover 1 reaches the temperature limiting action temperature, it takes about 90 seconds for the second bimetallic disc 6 to rotate and disconnect the moving and fixed contacts. Summary of the Invention

[0004] The technical problem this utility model aims to solve is to provide a temperature-controlled and temperature-limiting snap-action thermostat. It achieves temperature control and temperature limiting functions by stacking temperature-controlled bimetallic discs and temperature-limiting bimetallic discs of equal outer diameter in the same direction within a sealed cavity and directly contacting the sealed cavity. They share the same push rod and the same return spring. Because the temperature-limiting bimetallic disc is in direct contact with the sealed cavity throughout operation, the temperature limiting action has the highest accuracy. Furthermore, during operation, the temperature control action of the temperature-controlled bimetallic disc and the temperature limiting action of the temperature-limiting bimetallic disc are independent and do not interfere with each other. This thermostat has a simple structure, convenient assembly process, low production cost, and high production efficiency.

[0005] The technical solution proposed by this utility model is as follows:

[0006] A temperature-controlled and temperature-limiting snap-action thermostat includes a fixed-end connector, a first rivet, a fixed contact, a moving contact, a reset handle, a spring, a cover plate, a second rivet, a moving-end connector, a housing, a cap, a temperature-controlled bimetallic disc, and a temperature-limiting bimetallic disc. The fixed-end connector is riveted to the housing via the first rivet. The moving-end connector is riveted to one end of the spring and to the housing via the second rivet. The other end of the spring has a moving contact that is connected to the fixed contact for opening and closing. The reset handle is connected to the inner cylinder of the central sleeve of the cover plate for vertical movement and limiting connection. A transmission rod, a push rod, and a spring are also included. The push rod and transmission rod are connected in series to the inner wall of the central sleeve of the housing. The transmission rod is slidably connected, with one part of its upper end contacting the spring and the other part contacting the lower end of the reset handle. Temperature-controlling bimetallic discs and temperature-limiting bimetallic discs of the same outer diameter are stacked in the same direction within the sealing cavity. The outer peripheries of the temperature-controlling and temperature-limiting bimetallic discs are contacting the inner periphery of the sealing cover. The first outer surface of the temperature-controlling bimetallic disc is contacting the inner plane of the sealing cover. The lower end of the push rod is contacting the second inner surface of the temperature-limiting bimetallic disc. A spring, sleeved on the outer wall of the central sleeve, is provided between the second inner surface of the temperature-limiting bimetallic disc and the bottom surface of the inner annular groove of the housing.

[0007] When the temperature controller is at the temperature control operating temperature, the temperature control bimetallic disc jumps and flips upwards. The temperature limiting bimetallic disc attached to the first inner surface of the temperature control bimetallic disc pushes the push rod and transmission rod upwards, thereby pushing the spring to open the moving contact and the fixed contact.

[0008] When the temperature controller is at the temperature limit operation temperature, the temperature limit bimetallic disc jumps and flips upward, pushing the push rod and transmission rod to move upward, thereby pushing the spring to open the moving contact and the fixed contact, and pushing the reset handle to move upward.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] This utility model discloses a temperature-controlled and temperature-limiting snap-action thermostat. It comprises temperature-limiting bimetallic discs and temperature-controlling bimetallic discs of equal outer diameter, stacked sequentially from top to bottom in the same direction within a sealed cavity. The spring force maintains contact between the two discs and the inner plane of the sealed cavity. A vertically positioned transmission rod located in the center of the housing is connected in series with a push rod. The lower end face of the push rod contacts the central area of ​​the second inner surface of the temperature-limiting bimetallic disc, while a portion of the upper end face of the transmission rod contacts a spring, and the other portion contacts the lower end face of the reset handle. This structure enables: ① The thermostat to simultaneously perform automatic reset temperature control and manual reset temperature-limiting protection. ② The temperature control action of the temperature-controlling bimetallic disc and the temperature-limiting action of the temperature-limiting bimetallic disc are completely independent and do not interfere with each other. ③ Because the temperature-limiting bimetallic disc is always in contact with the inner plane of the cover through the temperature-controlling bimetallic disc, and its outer periphery is always in contact with the inner periphery of the cover, the sensed temperature of the temperature-limiting bimetallic disc is equal to the real-time temperature of the cover. Therefore, its temperature sensing hysteresis is very short, the temperature limiting action accuracy is the highest, and its temperature limiting protection effect is also the best. The measured temperature limiting action accuracy is about 10 seconds. ④ This temperature controller has a simple structure, convenient assembly process, low production cost, and high production efficiency. Attached Figure Description

[0011] Figure 1 is a schematic diagram of the structure of a temperature control and temperature limiting jump-type temperature controller according to this utility model.

[0012] Figure 2 is a schematic diagram of the position and connection structure of the cover, temperature-controlling bimetallic disc, temperature-limiting bimetallic disc, push rod, transmission rod, spring, reed, reset handle, and housing shown in Figure 1 in the initial state.

[0013] Figure 3 is a schematic diagram of the position and connection structure of the cover, temperature-controlling bimetallic disc, temperature-limiting bimetallic disc, push rod, transmission rod, spring, reed, and reset handle shown in Figure 1 during the temperature control operation.

[0014] Figure 4 is a schematic diagram of the position and connection structure of the cover, temperature-controlling bimetallic disc, temperature-limiting bimetallic disc, push rod, transmission rod, spring, reed, and reset handle shown in Figure 1 during the temperature-limiting action state.

[0015] Figure 5 is a schematic diagram of the cap structure shown in Figure 1.

[0016] Figure 6 is a schematic diagram of the temperature-controlled bimetallic disc structure shown in Figure 1.

[0017] Figure 7 is a schematic diagram of the temperature-limiting bimetallic disc structure shown in Figure 1. Detailed Implementation

[0018] The present invention will be further described in detail through the following embodiments.

[0019] Referring to Figures 1 to 7, a temperature-controlled and temperature-limiting snap-action thermostat includes a fixed-end connector 1, a first rivet 2, a fixed contact 3, a moving contact 4, a reset handle 5, a spring 6, a cover plate 8, a second rivet 9, a moving-end connector 10, a housing 11, a cover 12, a temperature-controlled bimetallic disc 14, and a temperature-limiting bimetallic disc 15. The fixed-end connector 1 is riveted to the housing 11 by the first rivet 2. The moving-end connector 10 is riveted to one end of the spring 6 and the housing 11 by the second rivet 9. The other end of the spring 6 has a moving contact 4 that is connected to the fixed contact 3 for opening and closing. The reset handle 5 is connected to the inner cylinder of the central sleeve 8 for vertical movement and limiting connection. A transmission rod 7, a push rod 16, and a spring 13 are also included. The push rod 16 and the transmission rod 7, connected in series, slide up and down against the inner wall of the central sleeve 11-2 of the housing 11. The transmission rod 7 is connected in a moving manner. One part of the upper end of the transmission rod 7 is in contact with the spring 6, and the other part is in contact with the lower end of the reset handle 5. The temperature-controlling bimetallic disc 14 and the temperature-limiting bimetallic disc 15 with the same outer diameter are stacked in the same direction and placed in the cavity 12-3 of the cover 12. The outer periphery of the temperature-controlling bimetallic disc 14 and the temperature-limiting bimetallic disc 15 are in contact with the inner periphery 12-1 of the cover 12. The first outer surface 14-2 of the temperature-controlling bimetallic disc 14 is in contact with the inner plane 12-2 of the cover 12. The lower end of the push rod 16 is in contact with the second inner surface 15-1 of the temperature-limiting bimetallic disc 15. A spring 13 is provided between the second inner surface 15-1 of the temperature-limiting bimetallic disc 15 and the bottom surface 11-1 of the inner annular groove of the housing 11, which is sleeved on the outer wall of the central sleeve 11-2.

[0020] When the temperature controller is at the temperature control operation temperature, the temperature control bimetallic disc 14 jumps and flips upwards. The temperature limiting bimetallic disc 15 attached to the first inner surface 14-1 of the temperature control bimetallic disc 14 pushes the push rod 16 and the transmission rod 7 to move upwards, thereby pushing the spring 6 upwards to open the moving contact 4 and the fixed contact 3.

[0021] When the temperature controller is at the temperature limit operation temperature, the temperature limit bimetallic disc 15 jumps and flips upward, pushing the push rod 16 and the transmission rod 7 to move upward, thereby pushing the spring 6 to open the moving contact 4 and the fixed contact 3, and pushing the reset handle 5 to move upward.

[0022] The temperature-limiting bimetallic disc 15 is naturally placed on top of the temperature-controlling bimetallic disc 14, with the second outer surface 15-2 contacting and overlapping the first inner surface 14-1. The second outer surface 15-2 is also in contact with the inner plane 12-2 of the cover 12 through the first inner surface 14-1. Since the outer diameters of the temperature-limiting bimetallic disc 15 and the temperature-controlling bimetallic disc 14 are the same, their two outer peripheries are always in contact with the inner periphery 12-1 of the cover 12. Therefore, the temperature-limiting bimetallic disc 15 always maintains direct and indirect contact with the cover 12, meaning that the temperature-limiting bimetallic disc 15 directly obtains the real-time temperature value of the cover during operation, thus maximizing the accuracy of the temperature-limiting action. Specifically, when the temperature of the cover 12 reaches the temperature-limiting action temperature value, the temperature-limiting bimetallic disc 15 can obtain the temperature-limiting action temperature value in real time. Through heat conduction between the metals, the temperature-limiting bimetallic disc flips and disconnects the moving and fixed contacts in a very short time; the measured time is approximately 10 seconds. Because of the spring 13, during operation, the spring 13 always applies a return spring force to the temperature limiting bimetallic disc 15 and the temperature controlling bimetallic disc 14, so that the second outer surface 15-2 of the limiting bimetallic disc 15 is always in close contact with the first inner surface 14-1 of the temperature controlling bimetallic disc 14, and the first outer surface 14-2 of the temperature controlling bimetallic disc 14 is always in close contact with the inner plane 12-2 of the cover 12 when not in operation. Thus, the purpose of temperature control and temperature limiting actions not interfering with each other and temperature control and temperature limiting actions being independent of each other is achieved.

[0023] The temperature-controlling bimetallic disc 14 resets when the temperature is about 10°C below the temperature control activation temperature; the temperature-limiting bimetallic disc 15 resets only when the temperature is below -10°C.

[0024] Automatic reset temperature control process: When the temperature of the cover 12 reaches the temperature control activation temperature, the temperature control bimetallic disc 14 immediately jumps upward and flips, while the temperature limiting bimetallic disc 15 remains in its original position and rises, pushing the push rod 16 and the transmission rod 7 upward. This pushes the spring 6 upward, causing the moving contact 4 to disconnect from the fixed contact 3, thus disconnecting the external power supply. Afterward, when the temperature of the cover 12 drops to about 10°C below the temperature control activation temperature, the temperature control bimetallic disc 14 immediately flips downward and resets. The first outer surface 14-2 is in close contact with the inner surface 12-2 of the cover, and the second outer surface 15-2 of the temperature limiting bimetallic disc 15 is in close contact with the first inner surface 14-1 of the temperature control bimetallic disc 14. At the same time, under the elastic force of the spring 6, the transmission rod 7 and the push rod 16 move downward, causing the lower end face of the push rod 16 to contact the central area of ​​the second inner surface 15-1, completing one automatic reset temperature control cycle.

[0025] Manual reset temperature limiting operation process: When the temperature control bimetallic disc 14 malfunctions, and the temperature of the cover 12 continues to rise from the temperature control activation temperature to the temperature limiting activation temperature, the temperature limiting bimetallic disc 15 immediately senses this temperature. After about 10 seconds, it suddenly jumps upward and flips, pushing the push rod 16 and the transmission rod 7 upward, which in turn pushes the spring 6 upward, causing the moving contact 4 to disconnect from the fixed contact 3, disconnecting the external power supply. At this time, the transmission rod 7 also pushes the reset handle 5 upward. Since the temperature limiting bimetallic disc 15 only resets below -10℃, it must be manually reset at room temperature. After troubleshooting the temperature control circuit, manually pressing the reset handle 5 causes the transmission rod 7 and the push rod 16 to move downward, causing the temperature limiting bimetallic disc 15 to flip downward and reset. At the same time, the spring 6 resets, the moving contact 4 and the fixed contact 3 close, and the external power supply is connected.

Claims

1. A temperature-controlled and temperature-limiting snap-action thermostat, comprising a fixed-end connector (1), a first rivet (2), a fixed contact (3), a moving contact (4), a reset handle (5), a spring (6), a cover plate (8), a second rivet (9), a moving-end connector (10), a housing (11), a cover (12), a temperature-controlled bimetallic disc (14), and a temperature-limiting bimetallic disc (15), wherein the fixed-end connector (1) is riveted to the housing (11) by the first rivet (2), the moving-end connector (10) is riveted to one end of the spring (6) and the housing (11) by the second rivet (9), the other end of the spring (6) is provided with a moving contact (4) that is connected to the fixed contact (3) for opening and closing, and the reset handle (5) is connected to the inner cylinder in the center of the cover plate (8) for vertical movement and limiting connection; characterized in that: It is also equipped with a transmission rod (7), a push rod (16) and a spring (13). The push rod (16) and the transmission rod (7) connected in series are slidably connected to the inner wall of the central sleeve (11-2) of the housing (11). Part of the upper end of the transmission rod (7) is in contact with the spring (6) and the other part is in contact with the lower end of the reset handle (5). Temperature-controlled bimetallic discs (14) and temperature-limiting bimetallic discs (15) with the same outer diameter are stacked in the same direction and placed in the cavity (12-3) of the cover (12). The temperature-controlled bimetallic discs (14) and temperature-limiting bimetallic discs (15) are stacked in the same direction. The outer periphery of the plate (15) is in contact with the inner periphery (12-1) of the cover (12), the first outer surface (14-2) of the temperature-controlled bimetallic disc (14) is in contact with the inner plane (12-2) of the cover (12), and the lower end of the push rod (16) is in contact with the second inner surface (15-1) of the temperature-limiting bimetallic disc (15). A spring (13) is provided between the second inner surface (15-1) of the temperature-limiting bimetallic disc (15) and the bottom surface (11-1) of the inner annular groove of the housing (11), which is sleeved on the outer wall of the central sleeve (11-2).

2. The temperature limited thermostat according to claim 1, wherein: When the temperature controller is at the temperature control action temperature, the temperature control bimetallic disc (14) jumps and flips upwards. The temperature limiting bimetallic disc (15) attached to the first inner surface (14-1) of the temperature control bimetallic disc (14) pushes the push rod (16) and the transmission rod (7) upwards, thereby pushing the spring (6) upwards to open the moving contact (4) and the fixed contact (3).

3. The thermostat of claim 1, wherein: When the temperature controller is at the temperature limit action temperature, the temperature limit bimetallic disc (15) jumps and flips upward, pushing the push rod (16) and transmission rod (7) to move upward, thereby pushing the spring (6) to open the moving contact (4) and the fixed contact (3), and pushing the reset handle (5) to move upward.

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