CN2605169Y - Overtemperature protection apparatus - Google Patents
Overtemperature protection apparatus Download PDFInfo
- Publication number
- CN2605169Y CN2605169Y CN 02277940 CN02277940U CN2605169Y CN 2605169 Y CN2605169 Y CN 2605169Y CN 02277940 CN02277940 CN 02277940 CN 02277940 U CN02277940 U CN 02277940U CN 2605169 Y CN2605169 Y CN 2605169Y
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- resistor
- arm
- temperature
- comparative examples
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Abstract
A method of measuring a specific temperature comprises a wheatstone bridge which comprises known value delicate resistors R 1 and R 2 which are the second pair of proportional arms; and resistors R A and R B made of alloy which are the first pair of proportional arms. Power signal is arranged between the first and second pairs of proportional arms which are in parallel. The utility model also comprises a potential detector 1 connected with the middle points of the first and second pairs of proportional arms. The coefficient of the resistance value of the resistor R A is a changing with the temperature, while the coefficient of the resistance value of the resistor R B is b changing with the temperature, and b is more than a. When the potential detector 1 detects that the potential of the resistor R B is equal to that of the resistor R 2, a switching signal is output, and the sum of temperature exchange value Delta T and the normal temperature is the presupposed special temperature value.
Description
Technical field
The utility model belongs to a kind of device that utilizes the temperature variant characteristic of resistance alloys value to carry out overtemperature prote, the overtemperature protection device of the braking resistor of special rail traffic vehicles.
Background technology
Thermocouple, infrared sensitization, temperature-sensitive device etc. are adopted in the measurement of traditional overtemperature protection device usually, and the response time of its measurement is long, generally reach a second level; Measurement point has limitation, and error is big, and is difficult to accomplish the potential isolation with signal output system; Particularly under vibrations such as track traffic and wind-force heat-dissipation situation, thermocouple and infrared sensitive probe are difficult to accomplish the reliability and the accuracy of measurement point.
Technology contents
The purpose of this utility model is exactly the deficiency that exists at existing overtemperture control device temperature sensing means, for the temperature protection control technology provide a kind of fast, accurately, the overtemperature protection device protected in particular temperature value of failure-free.
The relation that it changes with temperature rising by the direct resistance of the alloy material resistance of reflection temperature traverse, two kinds of different-alloy resistance and external known resistance are constituted the actual temperature that a bridge circuit accurately reflects resistance alloys, and speed of response reaches the microsecond level.
Select two resistor R A, resistor R B that are made of alloy material, in certain range of temperatures, the temperature variant coefficient of resistor R A resistance is a, and the temperature variant coefficient of the resistance of resistor R B is b; The temperature variant coefficient of described resistor R B resistance is greater than the temperature variant coefficient of resistor R A resistance, and promptly b is greater than a; Precision resistor R1, R2, R3, R4 with known resistance constitute a Wheatstone bridge with resistor R A, RB, and wherein resistor R A, RB constitute the first Comparative Examples arm; Described resistor R 1, R2, R3 and R4 are connected in series in order and constitute the second Comparative Examples arm; Described resistor R 1, R2 constitute first series arm, and described resistor R 3, R4 constitute second series arm; Power supply signal is added between the first couple, the second Comparative Examples arm of two parallel connections; Also comprise a potential comparator 1, two comparison signal input ends of this potential comparator 1 are connected with the first Comparative Examples arm intermediate point, the second Comparative Examples arm intermediate point respectively, and the described first Comparative Examples arm intermediate point is the point of connection of resistor R A, RB; The described second Comparative Examples arm intermediate point is the point of connection of first series arm and second series arm; Two driving signal input of described potential comparator 1 are connected between the point of connection of the point of connection of resistor R 1 and R2 and resistor R 3 and R4; (as 20 ℃) at normal temperatures, the resistance of resistor R A, RB is known as RA, RB respectively; Current potential on the resistor R B is less than the current potential on second series arm, and when making temperature change value be Δ T, the current potential on the resistor R B equates with current potential on second series arm; Described potential comparator 1 detects the current potential on-off signal of output when current potential on second series arm equates on the resistor R B; this moment, temperature change value Δ T and normal temperature sum were exactly the particular temperature value of presetting; this on-off signal is sent to the actuating unit of fender guard, takes the corresponding protection action.
Description of drawings
Fig. 1 is the utility model schematic diagram;
Fig. 2 is the potential comparator functional block diagram.
The specific embodiment
As shown in Figure 1 and Figure 2, select two resistor R A, resistor R B that are made of alloy material, in certain range of temperatures, the temperature variant coefficient of resistor R A resistance is a, and the temperature variant coefficient of the resistance of resistor R B is b; The temperature variant coefficient of described resistor R B resistance is greater than the temperature variant coefficient of resistor R A resistance, and promptly b is greater than a; Precision resistor R1, R2, R3, R4 with known resistance constitute a Wheatstone bridge with resistor R A, RB, and wherein resistor R A, RB constitute the first Comparative Examples arm; Described resistor R 1, R2, R3 and R4 are connected in series in order and constitute the second Comparative Examples arm; Described resistor R 1, R2 constitute first series arm, and described resistor R 3, R4 constitute second series arm; Power supply signal is added between the first couple, the second Comparative Examples arm of two parallel connections; Also comprise a potential comparator 1, two comparison signal input ends of this potential comparator 1 are connected with the first Comparative Examples arm intermediate point, the second Comparative Examples arm intermediate point respectively, the described first Comparative Examples arm intermediate point is the point of connection of resistor R A, RB, and the described second Comparative Examples arm intermediate point is the point of connection of first series arm and second series arm; Two driving signal input of described potential comparator 1 are connected with the point of connection of resistor R 1, R2 and the point of connection of resistor R 3, R4 respectively; (as 20 ℃) at normal temperatures, the resistance of resistor R A, RB is known as RA, RB respectively; Current potential on the resistor R B is less than the current potential on second series arm, and when making temperature change value be Δ T, the current potential on the resistor R B equates with current potential on second series arm; Described potential comparator 1 detects the current potential on-off signal of output when current potential on second series arm equates on the resistor R B; this moment, temperature change value Δ T and normal temperature sum were exactly the particular temperature value of presetting; this on-off signal is sent to the actuating unit of fender guard, takes the corresponding protection action.
Alloy material can adopt Cr20Ni40, and its resistance change rate is 3% per 100 ℃, and Cr20Ni80, its resistance change rate are 1% per 100 ℃.
In certain range of temperatures, when variation of ambient temperature Δ T, the resistance value RA ' of resistor R A, RB, RB ' satisfy respectively:
RA′＝RA+ΔTa
RB′＝RB+ΔTb
Wherein RA, RB are the known at normal temperatures resistance value of resistor R A, RB.
The resistance of precision resistor R1, R2, R3, R4 is known, and because the resistance of resistor R 1, R2, R3, R4 all much larger than RA, RB, can be ignored the change in resistance that it produces with variation of ambient temperature.Because b is greater than a, the collocation by to the resistance value of resistor R 1, R2, R3, R4, RA, RB makes that the pressure drop on the resistor R B is less than the pressure drop on second series arm when ambient temperature is lower than set temperature value; When ambient temperature was greater than or equal to set temperature value, the pressure drop on the resistor R B was more than or equal to the pressure drop on second series arm; Potential comparator 1 detects this variation simultaneously, exports an on-off signal, and the action of this on-off signal promptly is the moment that ambient temperature reaches setting value constantly.
Have following equation to set up at operating point:
RA′/RB′＝(R1+R2)/(R3+R4)
Wherein:
RA′＝RA+ΔTa
RB '=RB+ Δ Tb, therefore following equation is set up:
(RA+ΔTa)/(RB+ΔTb)＝(R1+R2)/(R3+R4)
So:
ΔT＝[(R3+R4)RA-(R1+R2)RB]/[b(R1+R2)-a(R3+R4)]
Δ T just becomes a definite numerical value like this; temperature change value Δ T and normal temperature sum are exactly the particular temperature value of presetting; just when the protection temperature of setting is (Δ T+ normal temperature), adopt overtemperature protection device of the present utility model, just can reach the purpose of overtemperature prote.Its speed of response is fast, can reach the microsecond level, and reliable and stable.
Adopting alloy material Cr20Ni40 (Q alloy), its resistance change rate a as resistor R B is 3% per 100 ℃, and resistor R A adopts alloy material Cr20Ni80 (Q alloy), and its resistance change rate b is 1% per 100 ℃.The resistance of getting resistor R1, R2, R3, R4 under the normal temperature is R1=51.8, R2=51.6, R3=49.97, R4=49.96, RA=0.0442, RB=0.0375, and then temperature change value Δ T=600 ℃, temperature change value Δ T and normal temperature sum are 620 ℃.
The following logic of described potential comparator 1 on-the-job satisfaction:
When braking resistor was not worked: K switch disconnected.
During the braking resistor normal operation: the K switch closure.
When braking resistor work but resistance overtemperature: K switch disconnects.
Claims (3)
1, a kind of overtemperature protection device, it is characterized in that precision resistor (R1), resistor (R2), resistor (R3), resistor (R4) with known resistance constitute a Wheatstone bridge with resistor (RA), the resistor (RB) that alloy material constitutes, wherein resistor (RA), resistor (RB) constitute the first Comparative Examples arm, and described resistor (R1), resistor (R2), resistor (R3) and resistor (R4) are connected in series in order and constitute the second Comparative Examples arm; Described resistor (R1), resistor (R2) constitute first series arm, and described resistor (R3), resistor (R4) constitute second series arm; Power supply signal is added between the first couple, the second Comparative Examples arm of two parallel connections; Also comprise a potential comparator (1), two comparison signal input ends of this potential comparator (1) are connected with the first Comparative Examples arm intermediate point, the second Comparative Examples arm intermediate point respectively, the described first Comparative Examples arm intermediate point is the point of connection of resistor (RA), resistor (RB), and the described second Comparative Examples arm intermediate point is the point of connection of first series arm and second series arm; Two driving signal input of described potential comparator 1 are connected with the point of connection of resistor R 1, resistor (R2) and the point of connection of resistor (R3), resistor (R4) respectively, and current potential on-off signal of output when current potential on second series arm equates that this potential comparator (1) detects on the resistor (RB) passes through signal output part.
2, a kind of overtemperature protection device as claimed in claim 1 is characterized in that described resistor (RA), resistor (RB) are the resistors that adopts the Q alloy material to constitute.
3, a kind of overtemperature protection device as claimed in claim 1 is characterized in that it is to adopt Cr20Ni40 alloy material resistor that described resistor (RA) adopts Cr20Ni80 alloy material resistor, resistor (RB).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02277940 CN2605169Y (en) | 2002-12-17 | 2002-12-17 | Overtemperature protection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02277940 CN2605169Y (en) | 2002-12-17 | 2002-12-17 | Overtemperature protection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2605169Y true CN2605169Y (en) | 2004-03-03 |
Family
ID=34150526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02277940 Expired - Lifetime CN2605169Y (en) | 2002-12-17 | 2002-12-17 | Overtemperature protection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2605169Y (en) |
-
2002
- 2002-12-17 CN CN 02277940 patent/CN2605169Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SOUTH ZHUZHOU ELECTRIC LOCOMOTIVE INSTITUTE CO., L Free format text: FORMER NAME OR ADDRESS: ZHUZHOU ELECTRIC LOCOMOTIVE INSTITUTE |
|
| CP03 | Change of name, title or address |
Address after: Zhuzhou City, Hunan province Tian Xin, zip code: 412000 Patentee after: CSR Zhuzou Electric Locomotive Research Institute Co., Ltd. Address before: Zhuzhou City, Hunan province Tian Xin, zip code: 412000 Patentee before: Zhuzhou Inst. of Electric Locomotive |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121217 Granted publication date: 20040303 |