Thermocouple device for vacuum temperature measurement

Abstract

The utility model discloses a thermocouple device for vacuum temperature measurement, which comprises two groups of conductors coated with an insulating tube, one ends of the two groups of conductors are connected to form a contact, the other ends of the two groups of conductors are jointly connected with a plug connecting piece, and the contact is positioned outside the insulating tube. The insulating tube is sequentially sleeved with a protective tube and a vacuum tube to form a multi-layer tube structure with one closed end and the other open end, the contact is located at the open end of the multi-layer tube structure, and the plug connecting piece is installed at the closed end of the multi-layer tube structure in a sealed mode. According to the thermocouple device for vacuum temperature measurement provided by the utility model, the contact between the two groups of conductors does not need to be shielded and coated during temperature measurement, and the whole device does not need to be placed in a vacuum environment, so that the temperature measurement precision of the vacuum environment is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature detection, in particular to a thermocouple device for vacuum temperature measurement. Background Technique

[0002] A thermocouple is a commonly used temperature measuring element in temperature measuring instruments. It converts a temperature signal into a thermal electromotive force signal and converts it into the temperature in the measured space or medium through an electrical instrument. The principle of thermocouple temperature measurement is that a closed loop is composed of two conductors with different compositions. When there is a temperature gradient at both ends, an electromotive force difference will be generated in the loop. The thermocouple uses this principle for temperature measurement. One end in the medium space is called the measurement end, and the other end is called the cold end; the cold end is connected to the display instrument, and the instrument displays the corresponding temperature through converting the electromotive force. At present, for vacuum temperature measurement, either an armored thermocouple is used, and through a complex sealing mechanism, the measurement end of the thermocouple is introduced into the detected space, and the cold end is connected to the instrument outside; or an assembled thermocouple is used, and the whole thermocouple is placed in a vacuum environment and is connected to the outside through compensating wires multiple times and then connected to the instrument.

[0003] For the armored thermocouple, by embedding the conductor in insulating magnesium oxide powder and covering the outer surface with a heat-resistant stainless steel tube, and installing a fixing device at the cold end and preparing it according to the required length, generally using a fixed length, the connection point of the conductor loop is wrapped in heat-resistant stainless steel and insulating material in this structure, and there may be a lag in the electromotive force difference, which has a deviation effect on the control of temperature accuracy. For the assembled thermocouple, it needs to be placed in a vacuum environment as a whole, and there is a multiple-transfer structure of compensating wires. Multiple transfers may cause the output electromotive force difference to be unstable or deviated, affecting the accuracy of temperature.

[0004] Based on this, a thermocouple device for vacuum temperature measurement is proposed to solve the above-mentioned problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a thermocouple device for vacuum temperature measurement to improve the temperature measurement accuracy of the vacuum environment.

[0006] To solve the above technical problems, the utility model provides a thermocouple device for vacuum temperature measurement, which includes two groups of conductors coated with insulating tubes. One ends of the two groups of conductors are connected to form a joint, and the other ends are commonly connected with a plug connector. The joint is located outside the insulating tube;

[0007] A protective tube and a vacuum tube are sequentially sleeved outside the insulating tube to form a multi-layer tube structure with one end closed and the other end open. The joint is located at the open end of the multi-layer tube structure, and the plug connector is sealed and installed at the closed end of the multi-layer tube structure.

[0008] Furthermore, the closed end of the multi-layer tube structure is sealed by a flange connector. The flange connector includes a first connecting flange and a second connecting flange that matches the first connecting flange. The first connecting flange and the second connecting flange are respectively installed at the ends of the protective tube and the vacuum tube, and an O-ring is provided between the first connecting flange and the second connecting flange.

[0009] Furthermore, the second connecting flange is fixedly connected to the vacuum tube by welding.

[0010] Furthermore, the protective tube is detachably inserted into the first connecting flange.

[0011] Furthermore, the plug connector is detachably installed in the middle of the first connecting flange, and a sealing washer is provided between the plug connector and the first connecting flange.

[0012] Furthermore, the plug connector is an aviation plug.

[0013] Furthermore, a heat dissipation member is further included, and the heat dissipation member is disposed at a position on the outer sidewall of the vacuum tube close to the plug connector.

[0014] Furthermore, the heat dissipation member includes a cooling water loop, the cooling water loop is disposed around the outer sidewall of the vacuum tube, and a water inlet interface and a water outlet interface are provided on the cooling water loop.

[0015] Furthermore, the cooling water loop is fixedly connected to the vacuum tube by welding.

[0016] Furthermore, the insulating tube uses a corundum core.

[0017] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0018] For the thermocouple device for vacuum temperature measurement provided by the present utility model, when measuring temperature, the contact points between its two groups of conductors do not need to be shielded or coated, and the entire device does not need to be placed in a vacuum environment, effectively improving the temperature measurement accuracy in the vacuum environment. Description of the Drawings

[0019] Figure 1 is a schematic diagram of the overall structure of a thermocouple device for vacuum temperature measurement according to the present utility model;

[0020] Figure 2 is of the present utility model Figure 1 an enlarged view of the structure at A in;

[0021] Figure 3 is a schematic diagram of the state when a thermocouple device for vacuum temperature measurement according to the present utility model is working;

[0022] Figure 4 This is an installation schematic diagram between the plug connector and the first connection flange in a thermocouple device for vacuum temperature measurement of the present utility model.

[0023] In the figure: 1. Insulating tube; 2. Conductor; 2a. Contact point; 3. Plug connector; 4. Protective tube; 5. Vacuum tube; 6. First connection flange; 7. Second connection flange; 8. O-ring; 9. Cooling water channel; 10. Water inlet interface; 11. Water outlet interface; 12. Sealing gasket; 13. Vacuum space; 14. Display instrument. Specific embodiments

[0024] The following will describe in more detail a thermocouple device for vacuum temperature measurement of the present utility model in conjunction with the schematic diagram, in which the preferred embodiments of the present utility model are shown. It should be understood that those skilled in the art can modify the present utility model described herein while still achieving the advantageous effects of the present utility model. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present utility model.

[0025] In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the drawings. The advantages and features of the present utility model will be clearer according to the following description and the claims. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0026] As Figure 1 and Figure 2 shown, an embodiment of the present utility model provides a thermocouple device for vacuum temperature measurement, which includes two groups of conductors 2 covered with an insulating tube 1. One ends of the two groups of conductors 2 are connected to form a contact point 2a, and the other ends are commonly connected to a plug connector 3. The contact point 2a is located outside the insulating tube 1.

[0027] An insulating tube 4 and a vacuum tube 5 are sequentially sleeved outside the insulating tube 1 to form a multi-layer tube structure with one end closed and the other end open. The contact point 2a is located at the open end of the multi-layer tube structure, and the plug connector 3 is sealed and installed at the closed end of the multi-layer tube structure.

[0028] Specifically, the inside of the protective tube 4 and the vacuum tube 5 is vacuum-treated. When measuring the temperature, one ends of the contact point 2a, the insulating tube 1, the protective tube 4 and the vacuum tube 5 away from the plug connector 3 are all placed in the vacuum space 13, and the plug connector 3 is connected to the display instrument 14, as Figure 3 shown. At this time, the contact point 2a has no shielding and covering in the vacuum space 13, and the plug connector 3 can be outside the vacuum environment, without the need to use compensating wires.

[0029] In summary, for the thermocouple device for vacuum temperature measurement provided by the present utility model, during temperature measurement, the contact points between its two groups of conductors do not need to be shielded or coated, and the entire device does not need to be placed in a vacuum environment, effectively improving the temperature measurement accuracy in the vacuum environment.

[0030] In a specific embodiment, the closed end of the multi-layer tube structure is sealed by a flange connector.

[0031] Specifically, the flange connector includes a first connecting flange 6 and a second connecting flange 7 that matches the first connecting flange 6; the first connecting flange 6 and the second connecting flange 7 are respectively installed at the ends of the protective tube 4 and the vacuum tube 5; an O-ring 8 is arranged between the first connecting flange 6 and the second connecting flange 7.

[0032] The first connecting flange 6 and the second connecting flange 7 are fixedly connected by bolts. Under the action of the O-ring 8, the sealed connection between the first connecting flange 6 and the second connecting flange 7 is ensured, and the multi-layer tube structure forms a closed end.

[0033] In the above implementation process, by setting the flange connector, not only the sealing performance is ensured, but also the protective tube 4 and the vacuum tube 5 can be separated, so that when one of the protective tube 4 or the vacuum tube 5 is damaged, the damaged device can be replaced separately.

[0034] Furthermore, the second connecting flange 7 is fixedly connected to the vacuum tube 5 by welding, ensuring the stability of the installation of the second flange 7 and the vacuum environment inside the multi-layer tube structure.

[0035] Furthermore, the protective tube 4 is detachably inserted into the first connecting flange 6 to achieve the quick disassembly between the protective tube 4 and the first connecting flange 6.

[0036] Preferably, the insulating tube 1 is made of a corundum core. The corundum core has high insulation and high stability. The insulating tube 1 made of a corundum core further improves the temperature measurement accuracy of the device.

[0037] In a specific embodiment, the plug connector 3 is detachably installed in the middle of the first connecting flange 6, and a sealing gasket 12 is arranged between the plug connector 3 and the first connecting flange 6.

[0038] Specifically, the plug connector 3 is an aviation plug, ensuring the safety and stability of the device.

[0039] Such as Figure 4 , the plug connector 3 can be detachably fixed to the first connecting flange 6 by screws. During the process of screwing the screws, the sealing gasket 12 is squeezed to achieve the effective sealing between the plug connector 3 and the first connecting flange 6.

[0040] It should be noted that the connection between the plug connector 3 and the first connection flange 6 is not limited to the above-described manner, and can also be a snap connection or other methods.

[0041] In a specific embodiment, the thermocouple device for vacuum temperature measurement further includes a heat dissipation member, and the heat dissipation member is disposed at one end of the outer wall of the vacuum tube 5 close to the plug connector 3. By providing the heat dissipation member, the cold end of the device can be reasonably cooled to ensure that the device is in the best state.

[0042] Specifically, the heat dissipation member includes a cooling water channel 9, the cooling water channel 9 is disposed around the outer wall of the vacuum tube 5, and an inlet interface 10 and an outlet interface 11 are provided on the cooling water channel 9. By connecting the inlet interface 10 and the outlet interface 11 to a circulating water system, circulating cooling water can be provided for the cooling water channel to achieve the purpose of efficient cooling.

[0043] Furthermore, the cooling water channel 9 is fixedly connected to the vacuum tube 5 by welding to avoid water leakage and seepage.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A thermocouple device for vacuum temperature measurement, characterized in that, It includes two groups of conductors covered with insulating tubes. One end of the two groups of conductors is connected to form a joint, and the other ends are commonly connected with a plug connector. The joint is located outside the insulating tube; A protective tube and a vacuum tube are sequentially sleeved outside the insulating tube to form a multi-layer tube structure with one end closed and the other end open; The joint is located at the open end of the multi-layer tube structure; The plug connector is sealed and installed at the closed end of the multi-layer tube structure.

2. The thermocouple device for vacuum temperature measurement according to claim 1, characterized in that, The closed end of the multi-layer tube structure is sealed by a flange connector; The flange connector includes a first connecting flange and a second connecting flange matching the first connecting flange The first connecting flange and the second connecting flange are respectively installed at the ends of the protective tube and the vacuum tube; An O-ring is arranged between the first connecting flange and the second connecting flange.

3. The thermocouple device for vacuum temperature measurement according to claim 2, characterized in that, The second connecting flange is fixedly connected to the vacuum tube by welding.

4. The thermocouple device for vacuum temperature measurement according to claim 2, wherein, The protective tube is detachably inserted into the first connecting flange.

5. The thermocouple device for vacuum temperature measurement according to claim 2, characterized in that, The plug connector is detachably installed in the middle of the first connecting flange, and a sealing washer is arranged between the plug connector and the first connecting flange.

6. A thermocouple device for vacuum temperature measurement according to claim 1 or 5, characterized in that, The plug connector adopts an aviation plug.

7. A thermocouple device for vacuum temperature measurement according to claim 1, characterized in that, It further includes a heat dissipation member, and the heat dissipation member is arranged at a position on the outer side wall of the vacuum tube close to one end of the plug connector.

8. A thermocouple device for vacuum temperature measurement according to claim 7, characterized in that, The heat dissipation member includes a cooling water ring channel, the cooling water ring channel is arranged around the outer side wall of the vacuum tube, and a water inlet interface and a water outlet interface are arranged on the cooling water ring channel.

9. The thermocouple device for vacuum temperature measurement according to claim 8, characterized in that, The cooling water ring channel is fixedly connected to the vacuum tube by welding.

10. A thermocouple device for vacuum temperature measurement according to claim 1, characterized in that, The insulating tube adopts a corundum core.

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