CN104458032A - Superheat degree measurement method and device - Google Patents

Superheat degree measurement method and device Download PDF

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Publication number
CN104458032A
CN104458032A CN201410739070.9A CN201410739070A CN104458032A CN 104458032 A CN104458032 A CN 104458032A CN 201410739070 A CN201410739070 A CN 201410739070A CN 104458032 A CN104458032 A CN 104458032A
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evaporator pipeline
superheat
electrode
degree
electrodes
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CN201410739070.9A
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CN104458032B (en
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朱鸽
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SUZHOU CHUANGTAI ELECTRONICS CO Ltd
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SUZHOU CHUANGTAI ELECTRONICS CO Ltd
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Abstract

The invention relates to a superheat degree measurement method implemented based on the seebeck effect. The method comprises the steps that firstly, the input end and the output end of an evaporator pipeline in a refrigerating cycle are connected into electrodes, and therefore the electrodes and the evaporator pipeline make tight contact and form a loop, wherein the electrodes are made of materials which contain metal materials and are different from the materials of the evaporator pipeline; then the electromotive force between the electrodes is measured; finally, the measured electromotive force is converted into temperature difference on the basis of the seebeck effect. The invention further relates to a superheat degree measurement device. The superheat degree measurement device comprises the two electrodes and an electromotive force measurer, wherein the two electrodes are made of materials which contain the metal materials and are different from the materials of the evaporator pipeline in the refrigerating cycle. The two electrodes are connected to the input end and the output end of the evaporator pipeline respectively, and therefore the electrodes and the evaporator pipeline make tight contact to form the loop. The electromotive force measurer is connected with the two electrodes. The superheat degree measurement method and device are achieved based on the seebeck effect, the superheat degree of the refrigerating cycle is achieved with high precision and reliability, and the cost can be significantly reduced.

Description

Degree of superheat measuring method and device
Technical field
The present invention relates to a kind of method for measuring the overtemperature of cold-producing medium and the difference of saturation temperature in refrigeration cycle and device.
Background technology
The degree of superheat to refer in refrigeration cycle the overtemperature of cold-producing medium and the difference of saturation temperature under identical evaporating pressure, and it is the important parameter that refrigeration system controls.In common refrigeration control system, the temperature difference usually by measuring evaporator inlet and outlet obtains the approximate value of the degree of superheat.Such measuring method needs to install a temperature sensor respectively, so there is following shortcoming in the outlet of evaporator and porch:
1, need two temperature sensors and two-way temperature measurement circuit, cost is higher.
2, entrance and exit (the normally circular copper pipe of temperature sensor needs and evaporator, and have vibration during work) there is thermo-contact closely, therefore difficulty is installed, also can get loose because of reasons such as vibration and corrosion during long-term work, produce measuring error, reliability is not high.
3, in traditional measuring method, because the temperature difference is obtained by two temperature subtraction calculations, the error of two-way temperature sensor and temperature measurement circuit thereof can produce cumulative, thus forms larger error.
Summary of the invention
The object of this invention is to provide that a kind of cost is lower and the degree of superheat measuring method that error is less, reliability is high.
For achieving the above object, the technical solution used in the present invention is:
A kind of degree of superheat measuring method, for measuring the overtemperature of cold-producing medium and the difference of saturation temperature in refrigeration cycle, the method realizes based on Seebeck effect; First, the discrepancy two ends of the evaporator pipeline in described refrigeration cycle are accessed respectively containing metal material and material differs from the electrode of described evaporator pipeline material used, make described electrode and described evaporator pipeline close contact and form loop; Then, the interelectrode electromotive force described in measurement; Finally, based on Seebeck effect, the electromotive force of survey is scaled temperature difference.
The material of described electrode is single metal or alloy.
The invention still further relates to the device that above-mentioned degree of superheat measuring method adopts.
A kind of degree of superheat measurement mechanism, for measuring the overtemperature of cold-producing medium and the difference of saturation temperature in refrigeration cycle, described degree of superheat measurement mechanism comprises containing metal material and material differs from two electrodes and the electro-motive force measurement device of the evaporator pipeline in described refrigeration cycle;
Electrode described in two is connected to the discrepancy two ends of described evaporator pipeline, and make described electrode and described evaporator pipeline close contact and form loop, described electro-motive force measurement device is connected with the electrode described in two.
Preferably, described degree of superheat measurement mechanism also comprise based on Seebeck effect by measured by described electro-motive force measurement device electromotive force be scaled the processor of temperature difference, described processor is connected with described electro-motive force measurement device.
Preferably, one end of described electrode is connected with the end of described evaporator pipeline and close contact, and the other end of described electrode is connected with described electro-motive force measurement device.
Preferably, described electrode and described evaporator pipeline are welded and connected.
Because technique scheme is used, the present invention compared with prior art has following advantages: degree of superheat measuring method of the present invention and device realize based on Seebeck effect, can with higher precision and reliable realization to the measurement of the degree of superheat of refrigeration cycle, and it can significantly reduce costs.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of degree of superheat measurement mechanism of the present invention.
In above accompanying drawing: 1, evaporator; 2, evaporator pipeline; 3, electrode; 4, electro-motive force measurement device; 5, processor.
Embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment one: have evaporator 1 in refrigeration cycle, has the evaporator pipeline 2 of circulation cold-producing medium in evaporator 1, under normal circumstances, this evaporator pipeline 2 is bending metal tube (as copper pipe), and its two ends are respectively to come in and go out and hold and extend to outside evaporator 1.Usually, this evaporator 1 is utilized to realize important parameter---the degree of superheat of refrigeration system, namely for measuring the measurement of the overtemperature of cold-producing medium and the difference of saturation temperature in refrigeration cycle.
For measuring a degree of superheat measuring method for the degree of superheat, the method realizes based on Seebeck effect.First, electrode 3 is accessed respectively at the discrepancy two ends of evaporator pipeline 2, this electrode 3 is containing metal material and material differs from evaporator pipeline 2 material used, the single metal or alloy (as constantan) of the material selection non-copper of such as electrode 3, after electrode 3 is accessed at the input two ends at evaporator pipeline 2 respectively, make two electrodes 3 and evaporator pipeline 2 close contact and form loop (formation thermocouple).Then, the electromotive force between potential electrode 3.Finally, based on Seebeck effect, the electromotive force of survey is scaled temperature difference.According to Seebeck effect, in the loop of two kinds of Metal Contact compositions, if make the temperature of two contact points different, then will there is electric current and corresponding electromotive force in the loop.Therefore, the electromotive force measured after the electrode 3 different by material and evaporator pipeline 2 build loop between two electrodes 3 can convert the formation drawing two electrodes 3 and evaporator pipeline 2 two contact points between the temperature difference, this temperature difference can think the approximate value of the degree of superheat, and its precision is higher.
Said method is realized by such as lower device.
As shown in Figure 1, a kind of degree of superheat measurement mechanism, comprise two electrodes 3 and electro-motive force measurement device 4, it can also include processor 5.Electrode 3 is containing metal material and its material differs from the evaporator pipeline 2 in refrigeration cycle, these two electrodes 3 are connected to discrepancy ends A, the B place of evaporator pipeline 2, and make electrode 3 and evaporator pipeline 2 close contact and form loop, namely contact point A, B of electrode 3 and evaporator pipeline 2 form two points for measuring temperature.Various ways can be adopted to realize the compact siro spinning technology of electrode 3 and evaporator pipeline 2, and such as, connect and close contact by being weldingly connected the end of one end of electrode 3 and evaporator pipeline 2, the other end C, D of two electrodes 3 are then connected with electro-motive force measurement device 4.When two electrodes 3 exist the temperature difference with two contact points A, B of evaporator pipeline 2, can electromotive force be produced in loop, now by electro-motive force measurement device 4 other end C, D at two electrodes 3, electromotive force be measured.Electro-motive force measurement device 4 is connected with processor 5, and the electromotive force of survey transfers in processor 5 by electro-motive force measurement device 4, and processor 5 can carry out the conversion of electromotive force and temperature difference and output temperature difference signal based on Seebeck effect.
Above-mentioned degree of superheat measuring method and device can strengthen the fastness of point for measuring temperature on the one hand, can improve the accuracy of degree of superheat measurement on the other hand and reduce costs.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.

Claims (6)

1. a degree of superheat measuring method, for measuring the overtemperature of cold-producing medium and the difference of saturation temperature in refrigeration cycle, is characterized in that: the method realizes based on Seebeck effect; First, the discrepancy two ends of the evaporator pipeline in described refrigeration cycle are accessed respectively containing metal material and material differs from the electrode of described evaporator pipeline material used, make described electrode and described evaporator pipeline close contact and form loop; Then, the interelectrode electromotive force described in measurement; Finally, based on Seebeck effect, the electromotive force of survey is scaled temperature difference.
2. degree of superheat measuring method according to claim 1, is characterized in that: the material of described electrode is single metal or alloy.
3. a degree of superheat measurement mechanism, for measuring the overtemperature of cold-producing medium and the difference of saturation temperature in refrigeration cycle, it is characterized in that: described degree of superheat measurement mechanism comprises containing metal material and material differs from two electrodes and the electro-motive force measurement device of the evaporator pipeline in described refrigeration cycle;
Electrode described in two is connected to the discrepancy two ends of described evaporator pipeline, and make described electrode and described evaporator pipeline close contact and form loop, described electro-motive force measurement device is connected with the electrode described in two.
4. degree of superheat measurement mechanism according to claim 3, it is characterized in that: described degree of superheat measurement mechanism also comprise based on Seebeck effect by measured by described electro-motive force measurement device electromotive force be scaled the processor of temperature difference, described processor is connected with described electro-motive force measurement device.
5. the degree of superheat measurement mechanism according to claim 3 or 4, is characterized in that: one end of described electrode is connected with the end of described evaporator pipeline and close contact, and the other end of described electrode is connected with described electro-motive force measurement device.
6. the degree of superheat measurement mechanism according to claim 3 or 4, is characterized in that: described electrode and described evaporator pipeline are welded and connected.
CN201410739070.9A 2014-12-08 2014-12-08 Degree of superheat measuring method and device Active CN104458032B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109269664A (en) * 2018-10-19 2019-01-25 上海应用技术大学 A kind of temperature measuring device for hearth and boiler

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CN102398220A (en) * 2011-11-21 2012-04-04 上海理工大学 Device for measuring temperature of grinding area during plane grinding
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US5410887A (en) * 1992-10-01 1995-05-02 Hitachi, Ltd. Apparatus for detecting composition of refrigerant and method therefor
JP2000065649A (en) * 1998-08-21 2000-03-03 East Japan Railway Co Super heat-measuring device of air-conditioning facility
CN1515885A (en) * 2003-01-09 2004-07-28 程 华 Building structure temperature real-time sensing and monitoring method
CN101738264A (en) * 2008-11-11 2010-06-16 易维特科技股份有限公司 Temperature sensing device for measuring temperature of multiple to-be-measured positions
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CN102398220A (en) * 2011-11-21 2012-04-04 上海理工大学 Device for measuring temperature of grinding area during plane grinding
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109269664A (en) * 2018-10-19 2019-01-25 上海应用技术大学 A kind of temperature measuring device for hearth and boiler
CN109269664B (en) * 2018-10-19 2020-10-09 上海应用技术大学 Furnace temperature measuring device and boiler

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