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

Abstract

The invention 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

Technical Field

[0001] The invention relates to the technical field of sudden jump type thermostats, and in particular to a temperature control and temperature limiting sudden jump type thermostat. Background Art

[0002] The Chinese Patent Gazette has published a utility model patent with the announcement number CN214672389U and the name "A kind of automatic reset temperature control and manual reset temperature limit type jump type thermostat". The specification of paragraphs 0018-0023 specifically discloses: the automatic reset temperature control function module is mainly composed of the first bimetallic disc 3, the first action rod 4, the fixed contact plate 9 and the moving contact bracket 13. The right end of the moving contact bracket 13 is fixed with the moving contact 12, and the left end of the fixed contact plate 9 is fixed with the fixed contact 11. The manual reset temperature limit function module is mainly composed of the second bimetallic disc 6, the second action rod 5, the moving contact bracket 13 and the reset handle 14. The second action rod 5 is sleeve-shaped, and the first lower end face 5-2 and the second lower end face 5-3 are provided at the lower part. The bracket 7 is in the shape of a reverse oblate basin, hollow, and its reverse side 7-1 and the outer peripheral edge 7-2 are respectively matched and movably connected with the guide frame 2 and the shell 8.

[0003] It can be seen that the technical solution has the following disadvantages: ① The automatic reset temperature control function module and the manual reset temperature limit function module use more parts, and the first action rod 4 and the second action rod 5 need to be set separately. The position and connection structure of each part are relatively complicated, the assembly process is complicated, and the production cost is high; ② Since the distance between the second bimetallic disc 6 (temperature limit) and the cover 1 is relatively far, the actual measurement is 3.4mm, and the temperature of the cover 1 needs to be transferred to the ceramic guide frame 2 first; then transferred to the copper bracket 7 by the ceramic guide frame 2, and finally transferred to the second bimetallic disc 6 by the copper bracket 7, so the temperature limit action accuracy is low. The actual temperature limit action accuracy is about 90 seconds, that is, when the temperature of the cover 1 reaches the temperature limit action temperature, it will take about 90 seconds for the second bimetallic disc 6 to flip and disconnect the moving and fixed contacts. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a temperature-controlling and temperature-limiting snap-type thermostat, which realizes the temperature-controlling and temperature-limiting functions by placing a temperature-controlling bimetallic disc and a temperature-limiting bimetallic disc of equal outer diameter in the same direction in a sealing cover cavity and directly contacting and connecting with the sealing cover, and sharing the same push rod and the same return spring; since the temperature-limiting bimetallic disc is in direct contact with the sealing cover from beginning to end, the temperature-limiting action has the highest accuracy; at the same time, during the working process, the temperature-control action of the temperature-control bimetallic disc and the temperature-limiting action of the temperature-limiting bimetallic disc are independent and do not interfere with each other; the temperature controller has a simple structure, convenient assembly process, low production cost and high production efficiency.

[0005] The technical solution proposed by the present invention is as follows: A temperature-control and temperature-limiting snap-action thermostat, comprising a fixed-end wiring piece, a first rivet, a fixed contact, a moving contact, a reset handle, a spring, a cover plate, a second rivet, a moving-end wiring piece, a shell, a cover, a temperature-control bimetallic disc, and a temperature-limiting bimetallic disc. The fixed-end wiring piece is riveted to the shell through the first rivet, and the moving-end wiring piece is riveted to one end of the spring and the shell through the second rivet. The other end of the spring is provided with a moving contact that is open and closed with the fixed contact. The reset handle moves up and down with the central inner cylinder of the cover plate and is limitedly connected; a transmission rod, a push rod and a spring are also provided, and the push rod and the transmission rod connected in series are connected to the inner cylinder wall of the central sleeve of the shell. A downward sliding connection, a part of the upper end of the transmission rod is in contact with the spring, and the other part is in contact with the lower end of the reset handle; the temperature controlling bimetallic disc and the temperature limiting bimetallic disc with the same outer diameter are overlapped in the same direction and placed in the sealing cover cavity, the outer peripheries of the temperature controlling bimetallic disc and the temperature limiting bimetallic disc are in contact with the inner periphery of the sealing cover, the first outward surface of the temperature controlling bimetallic disc is in contact with the inward plane of the sealing cover, and the lower end of the push rod is in contact with the second inward surface of the temperature limiting bimetallic disc; a spring that is sleeved on the outer cylinder wall of the central sleeve is provided between the second inward surface of the temperature limiting bimetallic disc and the bottom surface of the inner ring groove of the shell.

[0006] When the thermostat is at the temperature control action temperature, the temperature control bimetallic disc suddenly jumps upward and flips over, and the temperature limiting bimetallic disc attached to the first inward surface of the temperature control bimetallic disc pushes the push rod and the transmission rod upward, thereby pushing the spring upward to open the moving contact and the fixed contact.

[0007] When the thermostat is at the temperature limiting action temperature, the temperature limiting bimetallic disc flips upward, pushing the push rod and the transmission rod to move upward, thereby pushing the reed to open the moving contact and the fixed contact, and pushing the reset handle to move upward.

[0008] Compared with the prior art, the present invention has the following significant effects: The temperature-control and temperature-limiting jump-type thermostat of the present invention is to place a temperature-limiting bimetallic disc and a temperature-controlling bimetallic disc of equal outer diameter in a cover cavity in the same direction from top to bottom, and the spring force generated by the spring keeps the two discs in contact with the inner plane of the cover. The vertical transmission rod located in the center of the shell is connected in series with the push rod, and the lower end face of the push rod is connected in contact with the central area of ​​the second inner face of the temperature-limiting bimetallic disc. A part of the upper end face of the transmission rod is connected in contact with the spring leaf, and the other part is connected in contact with the lower end face of the reset handle. Such a structure can make: ① The thermostat has both automatic reset temperature control function and manual reset temperature limit protection function. 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 of each other and do not interfere with each other. ③ Since the temperature-limiting bimetallic disc can always be in contact with the inner plane of the cover through the temperature-control bimetallic disc, and its outer periphery is always in contact with the inner periphery of the cover, the sensing temperature of the temperature-limiting bimetallic disc is equal to the real-time temperature of the cover, so 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 actual measurement of its temperature-limiting action accuracy is about 10 seconds. ④ This thermostat has a simple structure, convenient assembly process, low production cost and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a temperature-controlling and temperature-limiting sudden jump type thermostat of the present invention.

[0010] Figure 2 yes Figure 1 The diagram shows the positions and connection structures of the sealing cover, the temperature-controlling bimetallic disc, the temperature-limiting bimetallic disc, the push rod, the transmission rod, the spring, the reed, the reset handle and the housing in the initial state.

[0011] Figure 3 yes Figure 1 The diagram shows the positions and connection structures of the sealing cover, the temperature-control bimetallic disc, the temperature-limiting bimetallic disc, the push rod, the transmission rod, the spring, the reed and the reset handle when in the temperature-control action state.

[0012] Figure 4 yes Figure 1 The diagram shows the positions and connection structures of the sealing cover, the temperature-controlling bimetallic disc, the temperature-limiting bimetallic disc, the push rod, the transmission rod, the spring, the reed and the reset handle in the temperature-limiting action state.

[0013] Figure 5 yes Figure 1 Schematic diagram of the sealing structure shown.

[0014] Figure 6 yes Figure 1 Schematic diagram of the temperature control bimetallic disc structure.

[0015] Figure 7 yes Figure 1Schematic diagram of the temperature limiting bimetallic disc structure. DETAILED DESCRIPTION

[0016] The present invention is further described in detail by the following examples.

[0017] See also Figure 1 to Figure 7 As shown, a temperature-controlling and temperature-limiting snap-action thermostat comprises a fixed-end terminal piece 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 terminal piece 10, a housing 11, a cover 12, a temperature-controlling bimetallic disc 14, and a temperature-limiting bimetallic disc 15. The fixed-end terminal piece 1 is riveted to the housing 11 through the first rivet 2, the moving-end terminal piece 10 is riveted to one end of the spring 6 and the housing 11 through the second rivet 9, the other end of the spring 6 is provided with a moving contact 4 which is open and closed with the fixed contact 3, the reset handle 5 is moved up and down with the central inner cylinder of the cover plate 8 and is limitedly connected; a transmission rod 7, a push rod 16 and a spring 13 are also provided, and the push rod 16 and the transmission rod 7 connected in series are slidably connected up and down with the inner cylinder wall of the central sleeve 11-2 of the housing 11 A part of the upper end of the transmission rod 7 is in contact with the spring leaf 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 overlapped in the same direction and placed in the cavity 12-3 of the cover 12, the outer peripheries 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 outward surface 14-2 of the temperature-controlling bimetallic disc 14 is in contact with the inward plane 12-2 of the cover 12, and the lower end of the push rod 16 is in contact with the second inward surface 15-1 of the temperature-limiting bimetallic disc 15; a spring 13 sleeved on the outer cylinder wall of the central sleeve 11-2 is provided between the second inward surface 15-1 of the temperature-limiting bimetallic disc 15 and the bottom surface 11-1 of the inner ring groove of the shell 11.

[0018] When the temperature controller is at the temperature control action temperature, the temperature control bimetallic disc 14 suddenly jumps upward and flips over, and the temperature limiting bimetallic disc 15 attached to the first inward surface 14-1 of the temperature control bimetallic disc 14 pushes the push rod 16 and the transmission rod 7 to move upward, thereby pushing the spring leaf 6 upward to open the moving contact 4 and the fixed contact 3.

[0019] When the thermostat is at the temperature limiting action temperature, the temperature limiting bimetallic disc 15 suddenly 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.

[0020] The temperature-limiting bimetallic disc 15 is naturally placed on the temperature-controlling bimetallic disc 14, that is, the second outward surface 15-2 is in contact and overlapped with the first inward surface 14-1, and the second outward surface 15-2 is in contact and connected with the inward plane 12-2 of the cover 12 through the first inward surface 14-1; since the temperature-limiting bimetallic disc 15 has the same outer diameter as the temperature-controlling bimetallic disc 14, its two outer peripheries are always in contact and connected with the inner periphery 12-1 of the cover 12. It can be seen that the temperature-limiting bimetallic disc 15 is always in direct and indirect contact and connection with the cover 12, that is, the temperature-limiting bimetallic disc 15 always directly obtains the real-time temperature value of the cover during operation, so that the temperature-limiting action accuracy is maximized, that is, 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, and through heat conduction between metals, the temperature-limiting bimetallic disc is turned over in a very short time to disconnect the moving and fixed contacts, and the actual measured time is about 10 seconds. Due to the provision of the spring 13, during the working process, 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 outward surface 15-2 of the limiting bimetallic disc 15 is always in close contact and connection with the first inward surface 14-1 of the temperature-controlling bimetallic disc 14, and the first outward surface 14-2 of the temperature-controlling bimetallic disc 14 is always in close contact and connection with the inward plane 12-2 of the cover 12 when not in action, thereby achieving the purpose of non-interference between the temperature control action and the temperature limiting action and the independence of the temperature control action and the temperature limiting action.

[0021] The temperature-control bimetallic disc 14 is reset when the temperature is about 10°C lower than the temperature-control action temperature value; the temperature-limiting bimetallic disc 15 is reset only when the temperature is lower than -10°C.

[0022] Automatic reset temperature control working process: when the temperature of the cover 12 reaches the temperature control action temperature, the temperature control bimetallic disc 14 instantly jumps upward and flips, and the temperature limiting bimetallic disc 15 rises accordingly while maintaining its original shape and pushes the push rod 16 and the transmission rod 7 to move upward, and then pushes the spring 6 upward, so that the moving contact 4 is disconnected from the fixed contact 3, and the external power supply is disconnected. Afterwards, when the temperature of the cover 12 drops to about 10°C below the temperature control action temperature, the temperature control bimetallic disc 14 instantly flips downward and resets, and the first outward surface 14-2 is tightly contacted and connected with the inward plane 12-2 of the cover, and the second outward surface 15-2 of the temperature limiting bimetallic disc 15 is tightly contacted and connected with the first inward 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, so that the lower end surface of the push rod 16 is in contact and connected with the central area of ​​the second inward surface 15-1, completing an automatic reset temperature control cycle.

[0023] Manual reset temperature limit working process: When the temperature control bimetallic disc 14 fails, the temperature of the cover 12 continues to rise from the temperature control action temperature to the temperature limit action temperature, and the temperature limit bimetallic disc 15 immediately senses the temperature; after about 10 seconds, it suddenly flips upward, pushing the push rod 16 and the transmission rod 7 to move upward, and then pushing the spring 6 upward to disconnect the moving contact 4 from the fixed contact 3, and the external power supply is disconnected. At this time, the transmission rod 7 also pushes the reset handle 5 upward; because the temperature limit bimetallic disc 15 will only reset when it is below -10℃, it must be reset manually under room temperature. After eliminating the fault in the temperature control link, manually press the reset handle 5, the transmission rod 7 and the push rod 16 move downward to make the temperature limit bimetallic disc 15 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 turned on.

Claims

1. A temperature-controlling and temperature-limiting snap-action thermostat, comprising a fixed-end terminal lug (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 terminal lug (10), a housing (11), a cover (12), a temperature-controlling bimetallic disc (14), and a temperature-limiting bimetallic disc (15), wherein the fixed-end terminal lug (1) is riveted to the housing (11) via the first rivet (2), the moving-end terminal lug (10) is riveted to one end of the spring (6) and the housing (11) via the second rivet (9), the other end of the spring (6) is provided with a moving contact (4) which is openably connected to the fixed contact (3), the reset handle (5) is movable up and down and is position-limitedly connected to the central inner cylinder of the cover plate (8); and the characteristics are: A transmission rod (7), a push rod (16) and a spring (13) are also provided. The push rod (16) and the transmission rod (7) are connected in series and are slidably connected to the inner wall of the central sleeve (11-2) of the housing (11). A portion of the upper end of the transmission rod (7) is in contact with the spring (6), and another portion 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) having the same outer diameter are stacked in the same direction and placed in the cavity (12-3) of the cover (12). The temperature-controlling bimetallic disc (14) and the temperature-limiting bimetallic disc (15) are The outer periphery of the disc (15) is in contact with the inner periphery (12-1) of the cover (12), the first outward surface (14-2) of the temperature-controlling bimetallic disc (14) is in contact with the inward plane (12-2) of the cover (12), and the lower end of the push rod (16) is in contact with the second inward surface (15-1) of the temperature-limiting bimetallic disc (15); a spring (13) sleeved on the outer wall of the central sleeve (11-2) is provided between the second inward surface (15-1) of the temperature-limiting bimetallic disc (15) and the bottom surface (11-1) of the inner ring groove of the housing (11).

2. The temperature-controlling and temperature-limiting sudden jump thermostat according to claim 1 is characterized in that: When the temperature controller is at the temperature control action temperature, the temperature control bimetallic disc (14) suddenly flips upward, and the temperature limiting bimetallic disc (15) attached to the first inward surface (14-1) of the temperature control bimetallic disc (14) pushes the push rod (16) and the transmission rod (7) to move upward, thereby pushing the spring leaf (6) upward to open the moving contact (4) and the fixed contact (3).

3. The temperature-controlling and temperature-limiting sudden jump thermostat according to claim 1 is characterized in that: When the thermostat is at the temperature-limiting action temperature, the temperature-limiting bimetallic disc (15) flips upward, pushing the push rod (16) and the transmission rod (7) to move upward, thereby pushing the reed (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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