CN203931937U - A kind of thermal response switch - Google Patents
A kind of thermal response switch Download PDFInfo
- Publication number
- CN203931937U CN203931937U CN201420299852.0U CN201420299852U CN203931937U CN 203931937 U CN203931937 U CN 203931937U CN 201420299852 U CN201420299852 U CN 201420299852U CN 203931937 U CN203931937 U CN 203931937U
- Authority
- CN
- China
- Prior art keywords
- fixed
- heat dissipation
- thermal response
- welded
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002184 metal Substances 0.000 claims abstract description 26
- 230000017525 heat dissipation Effects 0.000 claims description 48
- 239000000945 filler Substances 0.000 claims description 8
- 238000010292 electrical insulation Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 31
- 230000005855 radiation Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
The utility model discloses the thermal response switch that a kind of coolant compressor is used.This thermal response switch, by improving the inside and outside heat conductivity of gas-tight container, more definitely promptly detects the variations in temperature of cold-producing medium etc.Thermal response switch of the present utility model has the withstand voltage gas-tight container being made up of metal outer casing and cover plate.Cover plate is by metallic plate and run through airtightly the conducting terminal pin being fixed thereon and form.By the peristome of outer casing by all-round surfaces that is welded on cover plate such as projection weldings, thereby form withstand voltage gas-tight container.By metal cooling pin processed and the conduction of heating panel heat as radiating part are weldingly fixed on the outer surface of outer casing possibly, thereby in the situation that not changing thermal response switch essential structure, provide a kind of technical ability to keep the compressive resistance of gas-tight container, can improve again the inside and outside heat conductivity of gas-tight container, more definitely promptly detect the thermal response switch of the variations in temperature etc. of cold-producing medium.
Description
Technical Field
The present invention relates to a thermally responsive switch using a bimetal, and more particularly to a thermally responsive switch having a structure suitable for an airtight type electric compressor used in an air conditioner or the like.
Background
Conventionally, in a motor compressor for a refrigerant used in an air conditioner or the like, a protection device for preventing a motor from being burned out by overheat or overcurrent has been used.
In particular, when importance is attached to the reactivity to an abnormal situation, the protection device is mounted in the hermetic container of the hermetic electric compressor, and therefore, a thermally responsive switch having a metal pressure-resistant hermetic container is used.
In the conventional patent documents, for example, japanese patent No. 2519530 and japanese patent application laid-open No. hei 10-144189 disclose such a thermally responsive switch having a structure shown in fig. 5 and 6, for example. The thermal response switch 101 is a pressure-resistant airtight container constituted by a metal outer case 102 and a cover plate 103.
The cover plate 103 is composed of a metal plate 4 and conductive terminal pins 6A and 6B. The metal plate 4 is provided with a through hole 4A, and the conductive pins 6A and 6B are passed through the through hole 4A and fixed to the metal plate 4 in an air-tight insulating manner by an electrically insulating filler 5 such as glass.
The outer case 102 is a dome-shaped pressure-resistant metal container having one end open, and has a thermally responsive plate 8 attached to the inside thereof, the thermally responsive plate 8 being formed of a bimetal or the like having a movable contact 7 at the tip, and being press-formed into a dish shape near the center, and abruptly reversed at a predetermined temperature to bring the movable contact 7 into and out of contact with a fixed contact described later. The cover plate 103 has a peripheral edge portion 4B thinner than the central portion at the peripheral edge of the metal plate 4, and the opening of the outer cover 102 is welded to the peripheral edge portion 4B over the entire periphery to constitute a pressure-resistant airtight container. The metal pressure-resistant airtight container thus configured can be used as it is in a compressed high-temperature high-pressure refrigerant atmosphere.
A fixed contact 9 facing the movable contact 7 is fixed by welding to the inner end of the hermetic container of one of the conductive pins 6A mounted on the cover plate 103. One end of a heater 10 is fixed to the inner end of the airtight container of the other conductive terminal pin 6B by welding, and the other end of the heater 10 is fixed to the metal plate 4 by welding. The surface of the electrically insulating packing 5 inside the airtight container is closely attached to a ceramic cover 11 without any gap to increase a creepage distance and to prevent scattered matter or the like from adhering to the packing when an arc is generated. Further, an electrically insulating material 12 such as epoxy resin is coated on the surface of the electrically insulating filler outside the airtight container to obtain a sufficient creepage distance. Therefore, even if the thermally responsive switch is miniaturized, a sufficient electrical insulation distance can be obtained. The operating temperature of the thermally responsive switch 101 is corrected by deforming the vicinity of the thermally responsive plate fixing portion of the airtight container from the outside.
The thermally responsive switch 101 is installed in a hermetic container of a refrigerant compressor and connected in series with a motor. Thus, the operating current of the motor flows through the conductive terminal pin 6B, the heater 10, the metal plate 4, the housing 102, the thermally responsive plate 8, the movable contact 7, the fixed contact 9, and the conductive terminal pin 6A. When the electric compressor is operated, the heater, the thermally responsive plate, and the like of the thermally responsive switch generate heat by the operating current, but in a normal state, the heat is absorbed by the refrigerant flowing around, and therefore, the thermally responsive plate is kept at the set operating temperature or lower, and the energized state is maintained.
When the temperature of the refrigerant is overheated for some reason or the heat generation inside the thermally responsive switch is increased by an overcurrent or the like to heat the thermally responsive plate to a temperature equal to or higher than a predetermined temperature, the thermally responsive plate reverses its bending direction to separate the movable contact from the fixed contact, thereby cutting off the power supply to the motor and preventing occurrence of a situation such as burnout. Further, the thermal response plate is repeatedly operated to eventually cause welding of the contact points, so that the opening and closing operation between the contact points cannot be performed, and when an excessive current continues to flow, a part of the heater 10 is fused to break the circuit.
As described above, the conventional thermally responsive switch can be operated by detecting overheat or overcurrent, but in recent years, it is required to further improve the heat exchange performance of the thermally responsive switch in order to further detect a temperature change of the refrigerant or the like. The thermally responsive switch mounted inside the sealed container of the hermetic electric compressor is a sealed container made of metal as described above, and therefore has a relatively high heat exchange efficiency with the refrigerant, but in order to detect the change of the refrigerant more reliably and rapidly, it is necessary to further improve the heat exchange efficiency and improve the response performance of the thermally responsive switch to the change of the ambient temperature or the change of the amount of heat radiation.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a thermal response switch that can not only keep the compressive strength of airtight container, but also improve the heat conductivity inside and outside the airtight container, more surely and rapidly detect out the temperature change of refrigerant etc. under the condition of not changing the basic structure of thermal response switch.
The utility model discloses a concrete technical scheme as follows:
a thermal response switch comprises a pressure-resistant airtight container composed of a metal pressure-resistant outer casing and a cover plate hermetically welded and fixed on the open end of the outer casing, two conductive terminal pins respectively fixed on two through holes penetrating through the cover plate hermetically and insulatively by an electrical insulation filler, wherein a fixed contact is welded and fixed on one conductive terminal pin, one end of a heater is welded and fixed on the other conductive terminal pin, the other end of the heater is welded and fixed on the cover plate,
the interior of the airtight container is electrically connected and fixed with a thermal response plate, one end of the thermal response plate is welded and fixed with a movable contact, the vicinity of the center is punched and formed into a dish shape and is suddenly reversed at a specified temperature,
the movable contact is provided as an opening/closing contact forming a pair with the fixed contact,
the temperature is corrected by deforming the vicinity of the thermally responsive plate fixing portion of the airtight container,
when the contact is welded, a part of the heater can be fused to cut off the circuit,
on the inner surface of the airtight container to which the electrically insulating filler of the conductive terminal pin is fixed, a heat-resistant inorganic insulating member is closely fixed without a gap,
wherein,
the surface of the outer housing is provided with a heat dissipation part,
the heat dissipation part is composed of a metal heat dissipation pin and a corrugated heat dissipation plate,
the heat dissipation pins are arranged in a straight line, and the heat dissipation plates are arranged in parallel with one row of the heat dissipation pins at certain intervals along two sides of one row of the heat dissipation pins.
Furthermore, the two corrugated heat dissipation plates are symmetrically arranged with the heat dissipation pins therebetween, and the heat dissipation pins are arranged at the positions with larger gaps between the two heat dissipation plates.
The utility model discloses a thermal response switch increases the airtight container's of thermal response switch surface area through heat dissipation portions such as the heat dissipation round pin or heating panel that set up the metal on airtight container's surface.
By increasing the contact amount between the airtight container and the refrigerant in this way to improve the heat exchange efficiency, it is possible to improve the response performance to the temperature change of the refrigerant, and when the flow rate of the refrigerant changes, the temperature inside the thermally responsive switch housing can also change rapidly due to the change in the amount of heat exchange with the refrigerant. Therefore, the heat responsive plate is kept at the operating temperature or lower by rapidly transmitting the heat generated inside to the refrigerant in a normal state, while the heat responsive plate is rapidly brought to the operating temperature and the power supply is cut off when the refrigerant temperature rises or the flow of the refrigerant gas is abnormal.
By using such a thermally responsive switch for a hermetic compressor, the response speed to overheat or overcurrent can be increased, and higher protection performance can be obtained.
Drawings
Fig. 1 is a sectional view of a thermally responsive switch of embodiment 1.
Fig. 2 is a top view of the thermally responsive switch of fig. 1.
Fig. 3 is a sectional view of the thermally responsive switch of embodiment 2.
Fig. 4 is a top view of the thermally responsive switch of fig. 3.
Fig. 5 is a sectional view of an example of a conventional thermally responsive switch.
Fig. 6 is a cross-sectional view a-a of the thermally responsive switch of fig. 5.
Reference numerals
1. 21 thermally responsive switch
2. Outer cover shell
3 cover plate
4 Metal plate
5 electric insulating filler
6A, 6B conductive terminal pin
15 heat radiation pin
16. 26 radiator plate
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. The same portions as those of the conventional thermally responsive switch are denoted by the same reference numerals, and detailed description thereof is omitted.
The thermally responsive switch 1 shown in fig. 1 to 3 has a pressure-resistant airtight container constituted by a metallic outer case 2 and a cover plate 3. The cover plate 3 is composed of a metal plate 4 and conductive terminal pins 6A and 6B. The metal plate 4 is provided with a through hole 4A, and the conductive pins 6A and 6B are passed through the through hole 4A and fixed to the metal plate 4 in an air-tight insulating manner by an electrically insulating filler 5 such as glass. The pressure-resistant airtight container is constituted by welding the opening of the outer casing 2 to the surface of the lid plate 3 over the entire circumference by projection welding or the like.
In the present embodiment, 4 metal heat dissipation pins 15 as heat dissipation portions and two metal heat dissipation plates 16 are welded to the outer surface of the outer cover 2 so as to be thermally conductive, and the heat dissipation pins 15 are arranged in a line along the center of the flat surface portion 2A of the outer cover, and the heat dissipation plates 16 are arranged in parallel with one line of the heat dissipation pins at a predetermined interval along both sides of the one line of the heat dissipation pins. This increases the total surface area of the outer casing without changing the basic construction of the thermally responsive switch. Therefore, when the thermally responsive switch is installed in the sealed container of the sealed electric compressor and exposed to the refrigerant, the refrigerant flows between the heat dissipation pin as the heat dissipation portion and the heat dissipation plate, and the contact amount between the refrigerant and the metal portion is increased, thereby improving the heat exchange efficiency between the thermally responsive switch 1 and the refrigerant. In addition, the heat dissipation plate and the heat dissipation pin are arranged in parallel, so that the heat dissipation plate can guide the flow of the refrigerant to be positioned between the heat dissipation plates, and the refrigerant can better flow around the heat dissipation pin.
During normal operation, the thermally responsive plate 8, the heater 10, and the like generate heat by the operating current flowing through the thermally responsive switch, but the heat is radiated to the refrigerant through the outer casing 2 and the heat radiation pin 15, and therefore the thermally responsive plate 8 is kept at the operating temperature or lower. Therefore, during normal operation, the thermally responsive switch is not operated, and the operation of the electric compressor is not stopped.
If the heat transfer from the thermally responsive switch 1 to the refrigerant is reduced when the temperature of the refrigerant rises for some reason, the temperature inside the thermally responsive switch rises. Further, when the flow of the refrigerant gas changes, the amount of the refrigerant contacting the thermally responsive switch also changes, and thus the amount of heat radiation from the thermally responsive switch to the refrigerant also changes. In addition, when the rotation of the motor is restrained due to overload or the like, a large overload current flows, and the amount of heat generated in the thermally responsive switch at this time is far larger than the amount of heat dissipated by the refrigerant. In these cases, the thermally responsive plate 8 reaches the operating temperature and reverses its bending direction to interrupt the circuit, thereby preventing the occurrence of motor burnout and the like.
As described above, the thermally responsive switch of the present embodiment improves the heat exchange efficiency, and can be operated quickly to cut off the power supply when the refrigerant is overheated or an abnormal condition such as overcurrent is generated due to overload operation.
The 4 heat dissipation pins are provided in this embodiment as a specific implementation, and the number of the heat dissipation pins can be actually reduced or increased according to the needs.
Another embodiment of the present invention is described below with reference to fig. 4. In the thermally responsive switch 21 of the present embodiment, two corrugated heat dissipation plates 26 made of metal are used as the heat dissipation portions instead of the two heat dissipation plates 16 of the first embodiment, the corrugated heat dissipation plates 26 are symmetrically arranged around a row with heat dissipation pins sandwiched therebetween, and the gap between the two heat dissipation plates at the positions adjacent to the heat dissipation pins 15 is large, and the gap at the positions where the heat dissipation pins are not arranged is small. Thus, the refrigerant can more easily flow along the heat dissipation pins, and the heat exchange rate can be improved.
In the present embodiment, the strength of the outer cover 22 is improved by fixing the entire end surface of the plate-shaped heat sink 16 or the corrugated heat sink 26 along the flat surface portion 22A of the outer cover 22 by welding or the like. Therefore, the planar portion 22A can be thinned, thereby more improving the heat conduction efficiency.
Further, the surface area may be increased by providing more grooves or projections and depressions on the surface of the outer casing, for example, by roughening the surface of the outer casing, or the surface area may be increased not only on the outer casing side but also on the cover plate side.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is within the spirit and scope of the present invention.
Claims (2)
1. A thermal response switch comprises a pressure-resistant airtight container composed of a metal pressure-resistant outer casing and a cover plate hermetically welded and fixed on the open end of the outer casing, two conductive terminal pins respectively fixed on two through holes penetrating through the cover plate hermetically and insulatively by an electrical insulation filler, wherein a fixed contact is welded and fixed on one conductive terminal pin, one end of a heater is welded and fixed on the other conductive terminal pin, the other end of the heater is welded and fixed on the cover plate,
the interior of the airtight container is electrically connected and fixed with a thermal response plate, one end of the thermal response plate is welded and fixed with a movable contact, the vicinity of the center is punched and formed into a dish shape and is suddenly reversed at a specified temperature,
the movable contact is provided as an opening/closing contact forming a pair with the fixed contact,
the temperature is corrected by deforming the vicinity of the thermally responsive plate fixing portion of the airtight container,
when the contact is welded, a part of the heater can be fused to cut off the circuit,
on the inner surface of the airtight container to which the electrically insulating filler of the conductive terminal pin is fixed, a heat-resistant inorganic insulating member is closely fixed without a gap,
it is characterized in that the preparation method is characterized in that,
the surface of the outer housing is provided with a heat dissipation part,
the heat dissipation part is composed of a metal heat dissipation pin and a corrugated heat dissipation plate,
the heat dissipation pins are arranged in a straight line, and the heat dissipation plates are arranged in parallel with one row of the heat dissipation pins at certain intervals along two sides of one row of the heat dissipation pins.
2. The thermally responsive switch according to claim 1, wherein the two corrugated heat dissipating plates are symmetrically arranged with the heat dissipating pin therebetween, and the heat dissipating pin is arranged at a position where a gap between the two heat dissipating plates is large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420299852.0U CN203931937U (en) | 2014-06-06 | 2014-06-06 | A kind of thermal response switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420299852.0U CN203931937U (en) | 2014-06-06 | 2014-06-06 | A kind of thermal response switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203931937U true CN203931937U (en) | 2014-11-05 |
Family
ID=51827708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420299852.0U Expired - Lifetime CN203931937U (en) | 2014-06-06 | 2014-06-06 | A kind of thermal response switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203931937U (en) |
-
2014
- 2014-06-06 CN CN201420299852.0U patent/CN203931937U/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2009540550A (en) | Connection box for overheating protection of individual solar panels | |
| JP5001279B2 (en) | Thermally sensitive switch | |
| US4167721A (en) | Hermetic motor protector | |
| KR101117885B1 (en) | Thermally-actuated switch | |
| KR101241629B1 (en) | Thermally-actuated switch | |
| KR101902625B1 (en) | Actuating structure of battery safety valve | |
| EP2980824B1 (en) | Thermoresponsive switch and method for manufacturing same | |
| CN203931938U (en) | A kind of thermal response switch | |
| CN107490162B (en) | Electric heating pipe and air conditioner | |
| CN203931937U (en) | A kind of thermal response switch | |
| CN218975346U (en) | Protector for vehicle | |
| CN102915875B (en) | Thermal response switch | |
| WO2019174408A1 (en) | Battery cover plate assembly, cell, battery pack, power battery, and power vehicle | |
| JP2007157528A (en) | Ptc heater structure | |
| CN102915874B (en) | Thermal-response switch | |
| US20230283140A1 (en) | Motor protector | |
| KR20070109953A (en) | Thermally responsive electrical switch | |
| KR200485353Y1 (en) | Over load device | |
| KR101930149B1 (en) | Heat-reactive switch | |
| CN203859064U (en) | Thermoswitch | |
| CN217955705U (en) | Micro-gap switch that good heat dissipation | |
| CN218676861U (en) | Circuit breaker with wireless module | |
| JP2007278184A (en) | Protection device for electric compressor | |
| JP6413203B2 (en) | Thermally sensitive switch | |
| KR101794146B1 (en) | Thermally actuated switch and molding die |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141105 |