CN2322178Y

CN2322178Y - Automatic temp.-control electric switch

Info

Publication number: CN2322178Y
Application number: CN 97225964
Authority: CN
Inventors: 叶加鼎; 杨家洵
Original assignee: Cryogenic Laboratory of CAS
Current assignee: Key Laboratory of Cryogenics of CAS
Priority date: 1997-09-18
Filing date: 1997-09-18
Publication date: 1999-06-02
Anticipated expiration: 2007-09-18

Abstract

The utility model relates to an automatic temp.-control electric switch, comprising a microswitch connected with a power source, and a bellows type heat tube temperature control probe fixed at a housing and positioned at the lower part of the microswitch. The probe is composed of a heat pipe and a corrugated pipe which is communicated with the heat pipe. Non-condensable gases with the lighter specific weight are arranged in the corrugated pipe. A working medium is arranged in the heat pipe to improve the sensitivity and shorten the heat reaction time. An end plug is arranged in the corrugated pipe. The upper part of the heat pipe is provided with a tubule preventing the liquid backflow. The heat pipe is made into a dumbbell-shaped or flat cross section, and the inner wall of the heat pipe is in roughening or is sprayed with the metal powder. The automatic temp.-control electric switch has the advantages of high precision, short hot reaction time, simple structure, reliable work, and low cost.

Description

Automatic temperature-controlled electric switch

The utility model relates to a kind of temperature detect switch (TDS), particularly a kind of automatic temperature-controlled electric switch.

The mechanical type temperature detect switch (TDS) of Shi Yonging is by thermometer bulb in the market, tubule, flexible member and contact switch are formed, this mechanical type temperature detect switch (TDS) in use, the steam of evaporation improved the pressure of tubule and flexible member and the promotion contact switch when actuating medium in the thermometer bulb was heated, this temperature detect switch (TDS) exists the thermal response time long, when especially temperature reduces, steam in the tubule can be condensate on the tubule wall, and passage, cause the temperature control reaction time long, phenomenons such as sensitivity reduction, so this temperature detect switch (TDS) temperature control weak effect can only play thicker temperature control effect.

Also have the temperature detect switch (TDS) that uses solid adsorbent in thermometer bulb, because solid adsorbent is limited with contact area between the thermometer bulb wall, resistance to heat is big, also exists the defective that the thermal response time is long, sensitivity is low.

The temperature detect switch (TDS) of being made up of thermocouple (or thermistor), voltage (or electric current), amplifier is though can obtain the higher temperature control effect of sensitivity, its product structure complexity, manufacturing cost height.

The utility model purpose is to provide a kind of temperature-controlled precision higher, and the thermal response time is short, simple in structure, reliable operation and automatic temperature-controlled electric switch with low cost.

Embodiment of the present utility model is as follows:

The automatic temperature-controlled electric switch that the utility model provides, comprise the microswitch that links to each other with power supply, be fixed on the housing and be positioned at the probe of microswitch lower end push rod below, characteristics are: popping one's head in is bellows-type heat pipe probe, form by heat pipe and corrugated tube, the corrugated tube upper end closed, lower end and heat pipe are connected, during making, earlier corrugated tube and heat pipe are vacuumized, charge into the lighter inconduc of proportion, and then actuating medium is charged in the heat pipe, during work, actuating medium is subjected to thermal evaporation, steam pressure in heat pipe and the corrugated tube increases to be made corrugated tube elongation promote the push rod of microswitch lower end and microswitch is opened, otherwise when temperature descends, bellows contract and break away from push rod microswitch cuts out.

In order to improve sensitivity of the present utility model, the shortening heat reaction time increases a plug in bellows core, makes the volume-diminished in the corrugated tube, the weldering of plug and corrugated tube upper end is extremely guaranteeing sylphon seal, lower end and all around and leave suitable space between the corrugated tube.

In addition for preventing in heating process, steam is in the condensation of corrugated tube inwall and the anti-liquid tubule that returns is equipped with in the backflow of destruction work medium in heat pipe internal upper part, corrugated tube lower end, and the anti-liquid tubule that returns is that siphunculus and heat pipe and corrugated tube communicate.When actuating medium was heated, vapor pressure improved and passes the liquid tubule and enter in the space between corrugated tube and the plug and promote corrugated tube to extend upwardly progress and promote push rod microswitch is opened from anti-returning in the heat pipe.Otherwise temperature descends, and bellows contract is left push rod closes microswitch.Owing to plug has been installed and anti-to return what fill in liquid tubule and the corrugated tube be inconduc, so its sensitivity is higher, the thermal response time is shorter, the temperature control effect is higher.

In order further to improve sensitivity, shortening heat reaction time, also the heat pipe cross section can be made dumbbell shape or flat type, but its inwall hacking or spray metal powder augmentation of heat transfer.

Can also on power circuit, go here and there light emitting diode and hummer to increase indication of the present utility model and warning function.

The automatic temperature-controlled electric switch that the utility model provides, the temperature-controlled precision height, the thermal response time is short, and is simple in structure, and reliable operation is with low cost.

Further describe the utility model below in conjunction with drawings and Examples:

Accompanying drawing 1 is the utility model structural representation.

Accompanying drawing 2 is corrugated tube or heat pipe probe and the anti-liquid device synoptic diagram that returns.

1-knob 2-microswitch 3-light emitting diode 4-hummer

5-housing 6-power supply 7-bellows-type heat pipe temperature probe

The anti-liquid tubule that returns of 7a-plug 7b-corrugated tube bottom 7c-

8-actuating medium 9-corrugated tube 10-heat pipe 11-push rod

By Fig. 1 and Fig. 2 as can be known the utility model and example structure be:

Bellows-type heat pipe temperature probe 7 is fixed on the housing 5, there is microswitch 2 its top, there is push rod 11 the microswitch lower end, knob 1 fixing on the housing of microswitch 2 tops is in order to adjust the distance between probe 7 upper ends and push rod 11 lower ends, microswitch 2 parallel-series that is connected with power supply 6 has light emitting diode 3 and hummer 4, know by Fig. 2, bellows-type heat pipe temperature probe 7 is by corrugated tube 9, plug 7a and heat pipe 10 are formed, plug 7 is positioned at corrugated tube, plug 7 upper ends and the sealing of corrugated tube upper end, leave suitable space around the plug 7a and between lower end and the corrugated tube 9, corrugated tube 9 lower ends link to each other with heat pipe 10, and the anti-liquid tubule 7c that returns that is positioned at the heat pipe internal upper part is equipped with in the corrugated tube lower end, prevent that returning liquid tubule 7c is straight pipe, promptly heat pipe is by preventing that returning the liquid tubule communicates with corrugated tube.Its manufacturing process is: after earlier corrugated tube and heat pipe being vacuumized, charge into the lighter inconduc of proportion,, in heat pipe, charge into actuating medium afterwards again such as argon gas, helium or nitrogen etc., to guarantee that the gas in the corrugated tube is inconduc, stopped the steam condensation when temperature is fallen.

Claims

1. automatic temperature-controlled electric switch, comprise the microswitch that links to each other with power supply, be fixed on the probe that is positioned at push rod below, microswitch lower end on the housing, it is characterized in that: popping one's head in is bellows-type heat pipe temperature probe, form by heat pipe and corrugated tube, the corrugated tube upper end closed, lower end and heat pipe are connected, be filled with the lighter inconduc of proportion in the corrugated tube, actuating medium is housed in the heat pipe.

2. by the described automatic temperature-controlled electric switch of claim 1, it is characterized in that in the described corrugated tube plug being installed, plug upper end and the weldering of corrugated tube upper end be extremely guaranteeing sylphon seal, lower end and all around and leave the space between the corrugated tube.

3. by claim 1 or 2 described automatic temperature-controlled electric switches, it is characterized in that the anti-liquid tubule that returns that is positioned at heat pipe top being installed, prevent that returning the liquid tubule is straight pipe, and communicate with heat pipe and corrugated tube in the corrugated tube lower end.

4. by the described automatic temperature-controlled electric switch of claim 1, it is characterized in that described heat pipe cross section is dumbbell shape or flat type.

5. by the described automatic temperature-controlled electric switch of claim 1, it is characterized in that described inconduc can be argon gas, helium or nitrogen.

6. by the described automatic temperature-controlled electric switch of claim 1, it is characterized in that in power circuit, to go here and there light emitting diode and hummer.