CN216978168U

CN216978168U - Junction box with cold end compensation function

Info

Publication number: CN216978168U
Application number: CN202220146894.5U
Authority: CN
Inventors: 赵鹏; 白鸽; 赵玉; 徐琪
Original assignee: Suzhou Changfeng Aviation Electronics Co Ltd
Current assignee: Suzhou Changfeng Aviation Electronics Co Ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2022-07-15
Anticipated expiration: 2032-01-19

Abstract

The utility model provides a junction box with cold end compensation function, which comprises a sensitive element, wherein the sensitive element comprises: the first binding post and the second binding post are arranged at intervals and are provided with inner cavities; the first framework can be arranged in an inner cavity of the first binding post, the first framework is provided with two first conducting rods which are arranged at intervals, a nickel wire is wound on the periphery of the first framework, and two ends of the nickel wire are fixedly connected with one ends of the two first conducting rods respectively; the second framework can be arranged in an inner cavity of the second binding post, the second framework is provided with two second conducting rods which are arranged at intervals, a manganese copper wire is wound on the periphery of the second framework, and two ends of the manganese copper wire are fixedly connected with one ends of the two second conducting rods respectively. The cold junction compensation method and the cold junction compensation device can be applied to an aeroengine to receive the thermocouple temperature signal, and realize cold junction compensation of the thermocouple temperature signal by utilizing the characteristic that the resistance value of the internal sensitive element changes along with the temperature change.

Description

Junction box with cold end compensation function

Technical Field

The utility model relates to the technical field of manufacturing of thermoelectric devices, in particular to a junction box with a cold end compensation function.

Background

The thermal resistor and the thermocouple are used as temperature sensors, have different working principles and temperature measuring ranges and have advantages and disadvantages respectively. The working principle of the thermal resistor is that the resistance value of the temperature sensing element changes with the temperature according to the characteristic that the resistance value of the metal changes with the temperature and is approximately in direct proportion, when the temperature changes, the resistance value of the temperature sensing element changes with the temperature, and the temperature at the temperature sensing element can be determined according to the resistance value of the sensor and by contrasting a score table. The working principle of the thermocouple is based on the thermoelectric effect, and at present, the temperature signal of the thermocouple is usually compensated by a platinum resistor at the cold end.

But for industrial application, particularly under the condition of lower temperature, the nickel resistor can partially replace the platinum resistor, and has wide application prospect. Compared with platinum resistor, the nickel resistor has higher resistance temperature coefficient higher than that of platinum resistor by more than 50%, higher sensitivity, stable chemical property under general conditions, no action with elements such as oxygen, chlorine and the like, and a layer of compact nickel oxide generated on the surface of the nickel wire, thereby having protection effect. The nickel wire has good weldability and low price. At temperatures below 200 ℃, nickel has a good linearity of resistance-temperature characteristics, and therefore, nickel resistors are often used for on-board resistance sensors at temperatures below 200 ℃.

At present, the nickel resistor is usually a thin film nickel resistor, which adopts sensitive elements produced by thin film technology and micro-machining technology, so that the thin film nickel resistor has the advantages of small volume, small heat capacity, fast dynamic response and the like.

SUMMERY OF THE UTILITY MODEL

In view of this, embodiments of the present disclosure provide a junction box with cold junction compensation function to solve the problem of low temperature coefficient of resistance and sensitivity of a pt resistive sensing element.

The embodiment of the specification provides the following technical scheme: a junction box with cold end compensation, comprising a sensing element, the sensing element comprising: the first binding post and the second binding post are arranged at intervals and are provided with inner cavities; the first framework can be arranged in an inner cavity of the first binding post, the first framework is provided with two first conducting rods which are arranged at intervals, a nickel wire is wound on the periphery of the first framework, and two ends of the nickel wire are fixedly connected with one ends of the two first conducting rods respectively; the second framework can be arranged in an inner cavity of the second binding post, the second framework is provided with two second conducting rods which are arranged at intervals, a manganese copper wire is wound on the periphery of the second framework, and two ends of the manganese copper wire are fixedly connected with one ends of the two second conducting rods respectively.

Furthermore, the sensing element also comprises a first lead, and two ends of the first lead are respectively and fixedly connected with the other end of one of the first conducting rods and the other end of one of the second conducting rods.

Furthermore, the sensing element also comprises two second conducting wires, wherein one end of one second conducting wire is connected with the other end of the other first conducting rod, and one end of the other second conducting wire is fixedly connected with the other end of the other second conducting rod.

Furthermore, the sensitive element also comprises two third wires, wherein one end of one third wire is fixedly connected with the first binding post, and one end of the other third wire is fixedly connected with the second binding post.

Further, the junction box with the cold end compensation function further comprises a shell, the shell is provided with a cavity, and the sensitive element is fixedly arranged in the cavity.

Furthermore, the junction box with the cold end compensation function further comprises a connector, wherein the connector is of a sleeve-shaped structure and is fixedly arranged on the shell in a penetrating mode and connected with the sensitive element.

Furthermore, a clamping block is arranged in an inner hole of the shell, the clamping block is provided with two axial through holes which are arranged at intervals, and two ends of each axial through hole are respectively communicated with the inner cavity and the outer side of the shell.

Furthermore, the clamping block is formed by splicing two cuboids with the same structure.

Further, the two cuboids are fixedly connected with the connector through a first anti-dropping screw.

Furthermore, the upper end of the shell is an open end, the junction box with the cold end compensation function further comprises a cover plate, and the cover plate is arranged at the upper end of the shell in a covering mode.

Compared with the prior art, the beneficial effects that can be achieved by the at least one technical scheme adopted by the embodiment of the specification at least comprise: through set up the first skeleton of winding nickel silk and the second skeleton of winding manganese copper wire in the terminal box, therefore this embodiment has thermal capacity big for current film formula nickel resistance, and this embodiment has advantages such as thermal capacity is little, and self-heating error is little, high reliability, long-life, can be applied to aeroengine and receive thermocouple temperature signal, utilizes the characteristic that the resistance value of its inside sensing element changes along with temperature change, realizes thermocouple temperature signal's cold junction compensation, exports thermocouple temperature signal and cold junction compensation signal to control system simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a front view of an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1;

FIG. 4 is a schematic structural diagram of a sensing assembly in an embodiment of the present invention;

fig. 5 is a cross-sectional view of fig. 4.

Reference numbers in the figures: 1. a clamping block; 2. a second anti-drop screw; 3. a cover plate; 4. a housing; 5. a first anti-drop screw; 6. a connector; 7. a second screw; 8. a sensing element; 9. a first screw; 10. a first conductive line; 11. a second conductive line; 12. a third conductive line; 13. a first flat gasket; 14. a first spring washer; 15. a first hexagonal nut; 16. a first terminal post; 17. a second terminal; 18. a second flat washer; 19. a second spring washer; 20. a second hexagonal nut; 21. manganese copper wire; 22. a second skeleton; 23. nickel wire; 24. a first skeleton.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 5, an embodiment of the present invention provides a junction box with cold end compensation function, including a sensing element 8, where the sensing element 8 includes: the first terminal 16 and the second terminal 17 are arranged at intervals, and the first framework 24 and the second framework 22 are arranged at intervals. The first binding post 16 and the second binding post 17 both have an inner cavity; the first framework 24 can be arranged in an inner cavity of the first binding post 16, the first framework 24 is provided with two first conducting rods which are arranged at intervals, a nickel wire 23 is wound on the periphery of the first framework 24, and two ends of the nickel wire 23 are respectively fixedly connected with one ends of the two first conducting rods; the second framework 22 can be arranged in the inner cavity of the second binding post 17, the second framework 22 is provided with two second conducting rods which are arranged at intervals, the manganese copper wire 21 is wound on the periphery of the second framework 22, and two ends of the manganese copper wire 21 are fixedly connected with one ends of the two second conducting rods respectively.

Through arranging the first framework 24 wound with the nickel wire 23 and the second framework 22 wound with the manganese copper wire 21 in the junction box, compared with the existing film type nickel resistor, the thin film type nickel resistor has the advantages of large heat capacity, small self-heating error, high reliability, long service life and the like, can be applied to receiving a thermocouple temperature signal by an aeroengine, realizes cold end compensation of the thermocouple temperature signal by utilizing the characteristic that the resistance value of an internal sensitive element changes along with the temperature change, and simultaneously outputs the thermocouple temperature signal and the cold end compensation signal to a control system.

The first framework 24 and the second framework 22 are made of molding compound and are dumbbell-shaped, wherein the conductive rod is made of copper material.

In particular, the sensitive element 8 also comprises a first conducting wire 10, two second conducting wires 11 and two third conducting wires 12. Two ends of the first conducting wire 10 are respectively fixedly connected with the other end of one of the first conducting rods and the other end of one of the second conducting rods.

The sensitive element 8 is provided with a wire holder, the tail end of the wire holder is provided with four through holes, two of the through holes are in a group, and each group of through holes correspondingly penetrates through a second lead 11 and a third lead 12. One end of one of the second wires 11 is connected to the other end of the other first conductive rod, and one end of the other second wire 11 is fixedly connected to the other end of the other second conductive rod. In addition, one end of one of the third wires 12 is fixedly connected with the first binding post 16, and one end of the other third wire 12 is fixedly connected with the second binding post 17.

After the components are assembled, sequentially installing a first flat washer 13, a first spring washer 14 and a first hexagonal nut 15 on a first binding post 16; a second flat washer 18, a second spring washer 19 and a second hexagonal nut 20 are fitted onto the second post 17 in this order.

It should be noted that the head of the first terminal 16 is provided with a small thread, the tail of the first terminal 16 is knurled, the inner cavity of the first terminal 16 is arranged at the tail, and the material of the inner cavity is copper alloy and is used for connecting with a positive terminal lug on a compensation lead for transmitting a thermocouple temperature signal. The head of the second binding post 17 is provided with a larger thread, the tail part of the second binding post 17 is knurled, the inner cavity of the second binding post 17 is arranged at the tail part of the second binding post and is made of copper alloy and used for being connected with a negative pole lug plate on a compensation lead wire for transmitting a thermocouple temperature signal.

The first flat washer 13, the first spring washer 14, the first hexagon nut 15, the second flat washer 18, the second spring washer 19 and the second hexagon nut 20 are used for fixing the lug on the compensating lead, wherein the specifications of the flat washers, the spring washers and the hexagon nuts are matched with the thread size of the head part of the lug.

The junction box with the cold end compensation function further comprises a shell 4, wherein the shell 4 is provided with a cavity, and the sensitive element 8 is fixedly arranged in the cavity. The housing 4 is connected to a threaded hole in the bottom of the wire holder in the sensor 8 by means of a first screw 9. The head of shell 4 is provided with the external screw thread of being connected with the compensation wire that transmits thermocouple temperature signal, and the top, bottom and the afterbody of shell 4 all are provided with the screw hole, and shell 4 is provided with two waist shape mounting holes, and the material of shell 4 is stainless steel or aluminum alloy foundry goods.

Preferably, the junction box with cold end compensation function further comprises a connector 6, the connector 6 is in a sleeve-shaped structure, and the connector 6 is fixedly arranged on the housing 4 in a penetrating way and is connected with the sensitive element 8. The connector 6 is provided with four contacts, two of which are used to output the thermocouple temperature signal and the other two of which are used to output the cold end compensation signal.

The wires in the sensitive element 8 are connected with the contact bodies of the connector 6; the connector 6 is connected with the rear threaded hole of the housing 4 by a second screw 7.

Furthermore, a clamping block 1 is arranged in an inner hole of the connector 6, the clamping block 1 is provided with two axial through holes which are arranged at intervals, and two ends of each axial through hole are respectively communicated with the inner cavity and the outer side of the shell 4. In this embodiment, the clamping block 1 is formed by splicing two cuboids with the same structure, and the clamping block 1 is made of a rubber material and used for fixing a compensation lead for transmitting a thermocouple temperature signal. Wherein, two cuboids pass through first anticreep screw 5 and connector 6 fixed connection.

In this embodiment, the upper end of the housing 4 is an open end, the upper end of the housing 4 is further provided with a cover plate 3, and the cover plate 3 is fixedly connected with the housing 4 through the second anti-falling screw 2. The cover plate 3 is made of stainless steel or aluminum alloy.

The above description is only exemplary of the utility model and should not be taken as limiting the scope of the utility model, so that the utility model is intended to cover all modifications and equivalents of the embodiments, which may be included within the spirit and scope of the utility model. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.

Claims

1. Junction box with cold end compensation, comprising a sensitive element (8), characterized in that the sensitive element (8) comprises:

the first binding post (16) and the second binding post (17) are arranged at intervals, and the first binding post (16) and the second binding post (17) are provided with inner cavities;

the first framework (24) can be arranged in an inner cavity of the first binding post (16), the first framework (24) is provided with two first conducting rods which are arranged at intervals, a nickel wire (23) is wound on the periphery of the first framework (24), and two ends of the nickel wire (23) are fixedly connected with one ends of the two first conducting rods respectively;

second skeleton (22), can set up in the inner chamber of second terminal (17), second skeleton (22) are provided with the second conducting rod that two intervals set up, and the periphery of second skeleton (22) is around being equipped with manganese copper wire (21), the both ends of manganese copper wire (21) respectively with two the one end fixed connection of second conducting rod.

2. Junction box with cold end compensation according to claim 1, characterized in that the sensitive element (8) further comprises a first wire (10), both ends of the first wire (10) being fixedly connected to the other end of one of the first conductive bars and the other end of one of the second conductive bars, respectively.

3. Junction box with cold end compensation according to claim 2, characterized in that the sensitive element (8) further comprises two second wires (11), wherein one end of one second wire (11) is connected to the other end of the other first conductive rod, and one end of the other second wire (11) is fixedly connected to the other end of the other second conductive rod.

4. Junction box with cold end compensation according to claim 3, characterized in that the sensitive element (8) further comprises two third wires (12), wherein one end of one third wire (12) is fixedly connected to the first terminal (16) and one end of the other third wire (12) is fixedly connected to the second terminal (17).

5. Junction box with cold end compensation according to any of claims 1 to 4, characterized in that it further comprises a housing (4), the housing (4) having a cavity in which the sensitive element (8) is fixedly arranged.

6. Junction box with cold end compensation according to claim 5, characterized in that it further comprises a connector (6), the connector (6) is of a sleeve-like structure, and the connector (6) is fixed on the housing (4) and connected to the sensitive element (8).

7. Junction box with cold end compensation according to claim 6, wherein the inner hole of the outer shell (4) is provided with a clamping block (1), the clamping block (1) is provided with two axial through holes arranged at intervals, and two ends of each axial through hole respectively communicate the inner cavity with the outer side of the outer shell (4).

8. Junction box with cold end compensation according to claim 7, characterized in that the clamping block (1) is made by splicing two cuboids with the same structure.

9. Junction box with cold end compensation according to claim 8, wherein two cuboids are fixedly connected to the housing (4) by means of first anti-drop screws (5).

10. Junction box with cold end compensation according to claim 5, characterized in that the upper end of the housing (4) is an open end, further comprising a cover plate (3), the cover plate (3) covering the upper end of the housing (4).