Probe assembly and temperature controller

Abstract

The probe assembly comprises a metal heat conduction plate and a thermistor, the side edge of the metal heat conduction plate is integrally connected with an elastic arm support, and the elastic arm support is provided with a positioning opening; the lower portion of the silica gel insulation block is of a complete straight tube structure, the lower portion of the silica gel insulation block is placed in the positioning opening and is in clearance fit with the positioning opening, the middle of the silica gel insulation block extends to form a limiting ring, the width of the limiting ring is larger than that of the positioning opening, and the limiting ring abuts against the upper side of the elastic arm support. A lead channel is axially formed in the silica gel insulation block, a bearing seat is arranged at the top end opening, close to the lead channel, of the silica gel insulation block, the thermistor is placed on the upper side of the bearing seat, and the thermistor extends along the exterior of the lead channel to form a leading-out wire; the connection scheme is simple in structure and high in installation speed, and can improve the assembly efficiency, reduce the burden of workers, reduce the interference of peripheral structures on the thermistor and improve the temperature sensing precision.

Description

Technical Field

[0001] The utility model relates to the field of temperature controllers, in particular to a probe assembly and a temperature controller. Background Art

[0002] The current temperature sensor structure generally includes a metal shell and a thermistor installed in the metal shell. When the thermistor is installed in the inner cavity of the metal shell, sealing glue is injected into the inner cavity of the metal shell to fix the thermistor. However, during the process of injecting the sealant, bubbles are likely to remain in the inner cavity. When the temperature sensor is heated at high temperature, the air in the bubbles expands due to the heat, which can easily cause safety problems such as the temperature sensor exploding. Moreover, the production and assembly process is complicated and the production efficiency is low. The sealing glue used may release harmful substances that can be inhaled by the assemblers, causing personal injury. In addition, the raw materials of the metal shell and the top cover are expensive, which increases the production cost of the temperature sensor. During assembly, external wires are also required to connect the thermistor and the power terminal piece, which increases the assembly process and thus reduces production efficiency. Utility Model Content

[0003] The purpose of the present invention is to solve the above-mentioned existing problems and to provide a probe assembly and a temperature controller with a simple and reasonable structure.

[0004] A probe assembly includes a metal heat conducting plate and a thermistor, wherein the side of the metal heat conducting plate is integrally connected to an elastic arm bracket, and a positioning hole is provided on the elastic arm bracket; the probe assembly also includes a silicone insulating block, the lower part of the silicone insulating block is a complete straight cylindrical structure, and the lower part is placed in the positioning hole and forms a clearance fit with the positioning hole, a limiting ring with a width greater than the positioning hole extends in the middle of the silicone insulating block, the limiting ring is held against the upper side of the elastic arm bracket, a lead channel is axially provided in the silicone insulating block, and a receiving seat is provided at the top end of the silicone insulating block close to the lead channel, the thermistor is placed on the upper side of the receiving seat, and the thermistor has a lead wire extending along the outside of the lead channel.

[0005] The purpose of the utility model can also be solved by the following technical measures:

[0006] As a more specific solution, the positioning port is provided with an open port toward the end of the elastic arm bracket, and the positioning port with the open port forms a "U"-shaped structure, and limiting portions extend oppositely on both sides of the open port, and the distance between the two limiting portions is smaller than the width of any position of the positioning port.

[0007] As a further solution, the side of the metal heat conducting plate is integrally connected with a connecting portion arranged vertically downward, the elastic arm bracket is integrally connected to the bottom end of the connecting portion, and the elastic arm bracket is provided with a connecting through hole between the connecting portion and the positioning port for assembling the temperature controller.

[0008] As a further solution, the elastic arm bracket is provided with several reinforcing ribs along its extension direction, and the several reinforcing ribs are stamped integrally from the elastic arm bracket, and the several reinforcing ribs are arranged at least on the left and right sides of the positioning port and convex toward the bottom surface of the elastic arm bracket.

[0009] As a further solution, the distance between the receiving seat and the top end of the lead channel is expressed as H1, the horizontal height of the thermistor is expressed as H2, and H1≤H2.

[0010] As a further solution, the upper part of the silicone insulating block includes two symmetrically arranged semi-conical parts, the receiving seat is connected between the two semi-conical parts, the cross-section of the lead channel is an oblate structure, and the two semi-conical parts constitute a part of the lead channel.

[0011] The purpose of this utility model is achieved in this way:

[0012] A thermostat comprises an upper connecting seat, on which a conductive circuit and a sensor circuit are provided, wherein the conductive circuit comprises an anti-dry-burn switch, and the sensor circuit comprises two terminal pieces extending from the outside of the upper connecting seat, wherein terminals are connected between the terminal pieces and lead wires of a thermistor, and the top surface of the upper connecting seat is assembled with a probe assembly of the above structure, and an anti-dry-burn component adjacent to or against the anti-dry-burn switch is provided between the metal heat conducting plate and the upper connecting seat.

[0013] As a further solution, the terminal comprises a conductive copper sheet;

[0014] One end of the conductive copper sheet is integrally formed with a front wire clamp and a rear wire core clamp for connecting the lead wire, and the winding amplitude of the front wire clamp is greater than the winding amplitude of the rear wire core clamp;

[0015] The other end of the conductive copper sheet is integrally formed with a terminal crimping clamp, and the other end of the conductive copper sheet is stamped into a metal spring sheet that is folded toward the terminal crimping clamp. A clamping cavity for clamping the terminal piece is formed between the metal spring sheet and the terminal crimping clamp, and the metal spring sheet is provided with a breaking portion that can loosen or tighten the clamping cavity.

[0016] As a further solution, a fixed pressure plate for fixing the terminal piece is pressed between the metal heat conducting plate and the upper connecting seat; the terminal piece is provided with a bending portion that is close to the outer wall of the upper connecting seat, and a limiting cover extending from the fixed pressure plate to cover the outside of the bending portion, and limiting walls are extended inward from adjacent sides of the two limiting covers.

[0017] As a further solution, the conductive circuit includes two sets of anti-dry-heat switches, each of which is composed of a moving contact piece and a stationary contact piece that touch each other;

[0018] The anti-dry-heat assembly includes a bimetallic strip and an insulating rod. The bimetallic strip is fixed to the top surface of the metal heat-conducting plate. The insulating rod is slidably connected to the fixed pressure plate and is adjacent to or abuts against the bimetallic strip of one set of anti-dry-heat switches.

[0019] The anti-dry-burning component also includes temperature-sensitive particles and a supporting column. The supporting column is movably placed on a fixed pressure plate, and its bottom end makes the moving contact piece and the static contact piece of another set of anti-dry-burning switches contact. The top of the supporting column is provided with a positioning cavity for placing the temperature-sensitive particles, and the temperature-sensitive particles are supported against the bottom surface of the metal heat-conducting plate.

[0020] The beneficial effects of the utility model are as follows:

[0021] This connection solution has a simple structure and fast installation speed, which can improve assembly efficiency, reduce the burden on workers, reduce the interference of surrounding structures on thermistors, improve temperature sensing accuracy, and make the temperature controller suitable for large-scale automated production in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic top view of the structure of an embodiment of the probe assembly in the present invention.

[0023] Figure 2 This is a schematic diagram of the exploded structure of the probe assembly in the present invention.

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the silicone insulation block in the present invention.

[0025] Figure 4 This is a schematic top view of the structure of an embodiment of the temperature controller of the present invention.

[0026] Figure 5 This is a schematic diagram of the wiring terminal structure in the utility model.

[0027] Figure 6 This is a schematic diagram of the exploded structure of the temperature controller in this utility model.

[0028] Figure 7 This is a schematic diagram of the partial structure of the temperature controller in this utility model.

[0029] Figure 8 This is a schematic diagram of the cross-sectional structure of the temperature controller in this utility model. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] See also Figures 1 to 3As shown, a probe assembly includes a metal heat-conducting plate 1 and a thermistor 2, the side of the metal heat-conducting plate 1 is integrally connected with an elastic arm bracket 3, and a positioning hole 301 is provided on the elastic arm bracket 3; it also includes a silicone insulating block 4, the lower part 41 of the silicone insulating block 4 is a complete straight cylindrical structure, and the lower part 41 is placed in the positioning hole 301 and forms a clearance fit with the positioning hole 301, the middle of the silicone insulating block 4 is extended with a limiting ring 42 with a width greater than the positioning hole 301, the limiting ring 42 is held against the upper side of the elastic arm bracket 3, a lead channel 401 is axially opened in the silicone insulating block 4, and a receiving seat 44 is provided at the top end of the silicone insulating block 4 close to the lead channel 401, the thermistor 2 is placed on the upper side of the receiving seat 44, and the thermistor 2 has a lead wire 21 extending from the outside of the lead channel 401.

[0032] This connection solution has a simple structure and fast installation speed, which can improve assembly efficiency, reduce the burden on workers, reduce the interference of surrounding structures on thermistor 2, improve temperature sensing accuracy, and make the temperature controller suitable for large-scale automated production in industry.

[0033] The positioning opening 301 is provided with an open opening 302 toward the end of the elastic arm bracket 3. The positioning opening 301 with the open opening 302 forms a "U"-shaped structure, and two limiting portions 303 extend oppositely on both sides of the open opening 302. The distance between the two limiting portions 303 is less than the width of any position of the positioning opening 301.

[0034] During conventional assembly, since the diameter of the lower portion 41 of the silicone insulating block 4 is less than or equal to the width of the positioning opening 301, the silicone insulating block 4 can be placed into the positioning opening 301 from top to bottom, and the limiting ring 42 prevents the silicone insulating block 4 from sliding. After the probe assembly is installed, the downward pulling force of the lead wire 21 prevents the silicone insulating block 4 from jumping out of the positioning opening 301. In other embodiments, the silicone insulating block 4 can still be squeezed into the positioning opening 301 laterally using the open opening 302 for installation.

[0035] The side of the metal heat conducting plate 1 is integrally connected to a connecting portion 304 arranged vertically downward, and the elastic arm bracket 3 is integrally connected to the bottom end of the connecting portion 304. The elastic arm bracket 3 is provided with a connecting through hole 305 for assembling a thermostat between the connecting portion 304 and the positioning hole 301. This can strengthen the connection strength between the metal heat conducting plate 1 and the elastic arm bracket 3, making the elastic arm bracket 3 less likely to be bent or deformed.

[0036] After the thermostat is assembled, the connecting through hole 305 can be used to install the thermostat on the bottom surface of the heating plate.

[0037] The elastic arm bracket 3 is provided with a plurality of reinforcing ribs 306 along its extension direction. The plurality of reinforcing ribs 306 are stamped integrally from the elastic arm bracket 3, and the plurality of reinforcing ribs 306 are arranged at least on the left and right sides of the positioning opening 301 and convex toward the bottom surface of the elastic arm bracket 3; the plurality of reinforcing ribs 306 can also improve the strength of the elastic arm bracket 3.

[0038] The distance between the receiving seat 44 and the top end of the lead channel 401 is represented as H1, the horizontal height of the thermistor 2 is represented as H2, and H1≤H2; after being installed in place, under ideal conditions, the thermistor 2 can contact the heating disk for temperature sensing, so H1=H2 is preferably used so that the top surface of the silicone insulating block 4 can be flush with the thermistor 2, and in other cases, H1<H2, at this time, it can be ensured that the thermistor 2 protrudes and contacts the heating disk with the silicone insulating block 4 first.

[0039] The upper part of the silicone insulating block 4 includes two symmetrically arranged semi-conical parts 43, and the receiving seat 44 is connected between the two semi-conical parts 43. The cross-section of the lead channel 401 is an oblate structure, and the two semi-conical parts 43 constitute a part of the lead channel 401; this structure can improve the elasticity of the upper part of the silicone insulating block 4, and can deform accordingly when pressed against the heating disk, ensuring that the thermistor 2 contacts the heating disk.

[0040] The purpose of this utility model is achieved in this way:

[0041] See also Figures 4 to 8 As shown, a thermostat includes an upper connecting base 5, on which a conductive circuit and a sensor circuit are provided, wherein the conductive circuit includes an anti-dry-burn switch, and the sensor circuit includes two terminal pieces 6 extending from the outside of the upper connecting base 5, and a terminal 7 is connected between the terminal piece 6 and the lead wire 21 of the thermistor 2. The top surface of the upper connecting base 5 is assembled with a probe assembly of the above structure, and an anti-dry-burn component adjacent to or against the anti-dry-burn switch is provided between the metal heat conducting plate 1 and the upper connecting base 5.

[0042] The connection terminal 7 includes a conductive copper sheet 71;

[0043] One end of the conductive copper sheet 71 is integrally formed with a front wire clamp 72 and a rear wire core clamp 73 for connecting the lead wire 21, and the winding amplitude of the front wire clamp 72 is larger than the winding amplitude of the rear wire core clamp 73; the front wire clamp 72 is used to clamp the lead wire 21, and the rear wire core clamp 73 is used to clamp the core of the lead wire 21. At this time, while forming an electrical connection, the lead wire 21 is not easily pulled loose, and the connection is more secure.

[0044] The other end of the conductive copper sheet 71 is integrally formed with a terminal crimping clamp 74, and the other end of the conductive copper sheet 71 is stamped into a metal spring sheet 75 that is folded toward the terminal crimping clamp 74. A clamping cavity for clamping the terminal piece 6 is formed between the metal spring sheet 75 and the terminal crimping clamp 74, and the metal spring sheet 75 is provided with a bend-opening portion 76 that can loosen or tighten the clamping cavity; during installation, the other end of the conductive copper sheet 71 is inserted into the terminal piece 6, and the terminal piece 6 is inserted into the clamping cavity, and the elasticity of the metal spring sheet 75 is used to clamp the terminal piece 6 and form an electrical connection. When removing or reinstalling the terminal 7, it is only necessary to press the bend-opening portion 76 to make the metal spring sheet 75 loosen the terminal piece 6.

[0045] A fixed pressure plate 8 for fixing the terminal block 6 is press-fitted between the metal heat conducting plate 1 and the upper connecting seat 5; the terminal block 6 is provided with a bent portion 61 that is in close contact with the outer wall of the upper connecting seat 5, and a limiting cover 81 extends from the fixed pressure plate 8 to cover the outer side of the bent portion 61, and a limiting wall 82 extends inward from adjacent sides of the two limiting covers 81;

[0046] The conductive circuit includes two sets of anti-dry-burning switches, which are composed of a moving contact piece 91 and a static contact piece 92 that touch each other. One end of the static contact piece 92 extends out of the upper connecting seat 5 to serve as a live wire terminal piece or a neutral wire terminal piece, and the limit cover 81 can increase the creepage distance between the terminal piece 6 and the live wire terminal piece or the neutral wire terminal piece, and the limit wall 82 can support the terminal piece 6 to prevent the terminal piece 6 from being hit and swinging inward.

[0047] The anti-dry-heat assembly includes a bimetallic strip 10 and an insulating rod 11. The bimetallic strip 10 is fixed to the top surface of the metal heat-conducting plate 1. The insulating rod 11 is slidably connected to the fixed pressure plate 8 and is adjacent to or abuts against the bimetallic strip 10 between the moving contact piece 91 of one set of anti-dry-heat switches. When the temperature of the heating plate sensed by the bimetallic strip 10 equals or exceeds a preset temperature value, the bimetallic strip 10 actuates and drives the insulating rod 11, which presses downward against the moving contact piece 91, separating the moving contact piece 91 from the static contact piece 92, thereby disconnecting the circuit.

[0048] The anti-dry-burning component also includes temperature-sensitive particles 12 and a supporting column 13. The supporting column 13 is movably placed on the fixed pressure plate 8, and its bottom end makes the moving contact piece 91 of another group of anti-dry-burning switches contact with the static contact piece 92. The top of the supporting column 13 is provided with a positioning cavity for placing the temperature-sensitive particles 12, and the temperature-sensitive particles 12 are supported against the bottom surface of the metal heat-conducting plate 1; when the temperature of the heating disk sensed by the temperature-sensitive particles 12 is equal to or exceeds the preset temperature value, the temperature-sensitive particles 12 dissolve, and the supporting column 13 loses the top supporting force. The conventionally pressed moving contact piece 91 lifts the supporting column 13 and separates from the static contact piece 92, thereby disconnecting the circuit.

[0049] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A probe assembly comprising a metal heat conducting plate and a thermistor, characterized in that: The side of the metal heat conducting plate is integrally connected with an elastic arm bracket, and a positioning opening is provided on the elastic arm bracket; it also includes a silicone insulating block, the lower part of the silicone insulating block is a complete straight cylindrical structure, and the lower part is placed in the positioning opening and forms a clearance fit with the positioning opening, a limiting ring with a width greater than the positioning opening extends in the middle of the silicone insulating block, the limiting ring is held against the upper side of the elastic arm bracket, a lead channel is axially provided in the silicone insulating block, and a receiving seat is provided at the top end of the silicone insulating block facing the lead channel, the thermistor is placed on the upper side of the receiving seat, and the thermistor has a lead wire extending along the outside of the lead channel.

2. A probe assembly according to claim 1, characterized in that: The positioning port is provided with an open port toward the end of the elastic arm bracket. The positioning port with the open port forms a "U"-shaped structure, and limiting portions extend oppositely on both sides of the open port. The distance between the two limiting portions is smaller than the width of any position of the positioning port.

3. The probe assembly according to claim 1, wherein: The side of the metal heat conducting plate is integrally connected with a connecting portion vertically arranged downward, the elastic arm bracket is integrally connected to the bottom end of the connecting portion, and the elastic arm bracket is provided with a connecting through hole for assembling the thermostat between the connecting portion and the positioning port.

4. The probe assembly according to claim 1, wherein: The elastic arm bracket is provided with a plurality of reinforcing ribs along its extension direction. The plurality of reinforcing ribs are integrally stamped from the elastic arm bracket, and the plurality of reinforcing ribs are arranged at least on the left and right sides of the positioning opening and convex toward the bottom surface of the elastic arm bracket.

5. The probe assembly according to claim 1, characterized in that: The distance between the receiving seat and the top end of the lead channel is expressed as H1, the horizontal height of the thermistor is expressed as H2, and H1≤H2.

6. The probe assembly according to claim 1, characterized in that: The upper portion of the silicone insulating block includes two symmetrically arranged semi-conical portions, the receiving seat is connected between the two semi-conical portions, the cross section of the lead channel is an oblate structure, and the portion between the two semi-conical portions constitutes a part of the lead channel.

7. A thermostat comprising an upper connecting base, the upper connecting base being provided with a conductive circuit and a sensing circuit, wherein the conductive circuit includes an anti-dry-burn switch, and the sensing circuit includes two terminal blocks extending from the upper connecting base, wherein the terminal blocks are connected to lead wires of a thermistor via a terminal block, characterized in that: The top surface of the upper connecting seat is assembled and connected with the probe assembly according to any one of claims 1 to 6, and an anti-dry-burn component adjacent to or against the anti-dry-burn switch is provided between the metal heat conducting plate and the upper connecting seat.

8. The thermostat according to claim 7, characterized in that: The terminal comprises a conductive copper sheet; One end of the conductive copper sheet is integrally formed with a front wire clamp and a rear wire core clamp for connecting the lead wire, and the winding amplitude of the front wire clamp is greater than the winding amplitude of the rear wire core clamp; The other end of the conductive copper sheet is integrally formed with a terminal crimping clamp, and the other end of the conductive copper sheet is stamped into a metal spring sheet that is folded toward the terminal crimping clamp. A clamping cavity for clamping the terminal piece is formed between the metal spring sheet and the terminal crimping clamp, and the metal spring sheet is provided with a breaking portion that can loosen or tighten the clamping cavity.

9. The thermostat according to claim 7, characterized in that: A fixed pressure plate for fixing the terminal piece is pressed between the metal heat conducting plate and the upper connecting seat; the terminal piece is provided with a bending portion that is close to the outer wall of the upper connecting seat, and a limiting cover extending from the fixed pressure plate covers the outer side of the bending portion, and limiting walls extend inward from adjacent sides of the two limiting covers.

10. The thermostat according to claim 7, characterized in that: The conductive circuit includes two sets of anti-dry-heat switches, each of which is composed of a moving contact piece and a stationary contact piece that touch each other; The anti-dry-heat assembly includes a bimetallic strip and an insulating rod. The bimetallic strip is fixed to the top surface of the metal heat-conducting plate. The insulating rod is slidably connected to the fixed pressure plate and is adjacent to or abuts against the bimetallic strip of one set of anti-dry-heat switches. The anti-dry-burning component also includes temperature-sensitive particles and a supporting column. The supporting column is movably placed on a fixed pressure plate, and its bottom end makes the moving contact piece and the static contact piece of another set of anti-dry-burning switches contact. The top of the supporting column is provided with a positioning cavity for placing the temperature-sensitive particles, and the temperature-sensitive particles are supported against the bottom surface of the metal heat-conducting plate.

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