Heat absorber tube panel thermocouple fixing device

Abstract

The utility model provides a heat absorber tube panel thermocouple fixing device, and relates to the technical field of tower type solar heat absorbers. The fixing device comprises a tube panel, a heat preservation layer is arranged on the backlight side of the tube panel, a heat collection block is arranged between the tube panel and the heat preservation layer, a thermocouple is detachably installed on the heat collection block, the thermocouple comprises a thermocouple wire, a containing piece with a containing space is arranged between the tube panel and the heat preservation layer, and the thermocouple wire with a certain length and arranged in a bent mode is contained in the containing space. The utility model aims to provide a heat absorber tube panel thermocouple fixing device which can effectively absorb thermal displacement and prevent a thermocouple wire of a thermocouple from being stuck on a heat insulation layer, thereby improving reliability and accuracy of temperature measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of tower - type solar energy absorbers, and more specifically, to a fixing device for thermocouples of an absorber tube panel. Background Art

[0002] The absorber is one of the core devices of a tower - type solar power generation system. During the operation of a tower - type solar thermal power generation absorber, one side of the absorber tube panel (the light - facing side) receives light, and thermocouples are installed on the back to monitor the temperature. Its installation and use effects directly affect the safety and economy of the operation of a tower - type solar power station. Currently, armored thermocouples are generally used to measure the temperature of the heat - receiving surface tube wall, and a certain thickness of thermal insulation material is laid on the backlight side of the absorber. Under the operating conditions of the absorber, the tubes expand due to heat, while the thermal insulation material remains stationary. The measuring end of the thermocouple for monitoring is fixed on the tube heat - collecting block and moves with the tube panel. The thermocouple wire led out from the measuring end is led out from the thermal insulation layer. Since the maximum thermal displacement of the tubes in the absorber tube panel can reach more than 100 mm, in view of such a large thermal displacement, in order to ensure the normal operation of the system, a buffer loop (such as an S - shape, etc.) must be made during the installation of the thermocouples on the back of the absorber tube panel to offset this thermal displacement.

[0003] In the tower - type solar energy absorber wall temperature thermocouple heat - collecting block installation with the patent number CN209588431U, the thermocouple is fixedly installed on the sliding heat - collecting block through a thermocouple pressing part. The sliding heat - collecting block and the fixed heat - collecting block can achieve free relative sliding and can always maintain contact during the sliding process. The above - mentioned structure can ensure the free expansion and contraction of the heat - absorbing tube without affecting the thermocouple connection. However, its sliding connection method itself has relatively high requirements for the matching accuracy between the sliding heat - collecting block and the fixed heat - collecting block, with a large frictional resistance. And as the service time increases, gaps will appear in the connection between the sliding heat - collecting block and the fixed heat - collecting block under the action of friction. Once the connection is interrupted, it will directly affect the reliability and accuracy of temperature measurement. However, in the case of a relatively common thermocouple S - shaped buffer structure during use, since the thermocouple will have frictional contact with the thermal insulation layer during movement, it is easy to cause the thermocouple to get stuck in the thermal insulation layer, resulting in difficult overall sliding of the thermocouple, and thus it is also difficult to ensure the expected effect.

[0004] In summary, a fixing device for thermocouples of an absorber tube panel needs to be proposed to solve the problem of large - scale thermal displacement of thermocouples under high - temperature operating conditions. Summary of the Invention

[0005] The purpose of the utility model is to provide a fixing device for thermocouples of an absorber tube panel, which can effectively absorb thermal displacement and prevent the thermocouple wire from getting stuck in the thermal insulation layer, thereby improving the reliability and accuracy of temperature measurement.

[0006] The technical solution of the utility model is realized as follows:

[0007] A heat absorber tube panel thermocouple fixing device includes a tube panel, an insulation layer is provided on the backlight side of the tube panel, a heat collecting block is provided between the tube panel and the insulation layer, a thermocouple is detachably installed on the heat collecting block, the thermocouple includes a thermocouple wire, and a receiving member with an accommodating space is provided between the tube panel and the insulation layer, the above-mentioned accommodating space accommodates the above-mentioned thermocouple wire in a bent arrangement of a certain length.

[0008] This design can solve the problem of thermocouple wire getting stuck in the insulation layer due to thermal displacement when the absorber is operating at high temperature, and better ensure the stability of thermocouple measurement.

[0009] In some technical solutions of the present invention, the above-mentioned accommodating space is a sliding groove, which is provided through the side of the above-mentioned heat collecting block away from the tube panel, and the above-mentioned thermocouple wire is provided in the sliding groove.

[0010] The setting of the sliding groove makes it easier to lay out and install the thermocouple wire.

[0011] In some technical solutions of the present invention, the heat collecting block is provided with a blind hole, the thermocouple is arranged in the blind hole, and the heat collecting block is provided with a positioning piece for fixing the measuring end of the thermocouple to the heat collecting block.

[0012] Providing a positioning piece can further stabilize the connection between the thermocouple and the heat collecting block, and reduce the phenomenon of the thermocouple detaching from the heat collecting block when the tube panel in the heat absorber undergoes thermal displacement.

[0013] In some technical solutions of the present invention, the central axis of the blind hole is parallel to the central axis of the tube panel.

[0014] In some technical solutions of the present invention, the above-mentioned positioning member is a fastening screw, the above-mentioned heat collecting block is provided with a threaded hole connected to the above-mentioned blind hole, the central axis of the threaded hole and the central axis of the blind hole are perpendicular to each other, and the fastening screw passes through the threaded hole to abut the above-mentioned thermocouple against the heat collecting block.

[0015] This design is easy to install and disassemble. In addition, a countersunk groove can be opened on the heat collecting block, and the fastening screws are set in the countersunk groove to avoid friction between the screws and the insulation layer and reduce their disengagement.

[0016] In some technical solutions of the present invention, the positioning member is a clamp, the heat collecting block is provided with a fastening hole, the fastening hole is connected to the blind hole, and the clamp passes through the fastening hole to fix the thermocouple on the heat collecting block.

[0017] Using stainless steel clamps instead of fastening screws to fix the thermocouple can effectively prevent the thermocouple from slipping and failing.

[0018] In some technical solutions of the present invention, an arcuate groove is provided on the side of the heat collecting block away from the fastening hole. When the clamp is in the installed state, the portion thereof exposed outside the heat collecting block is embedded in the arcuate groove.

[0019] The provision of the arc-shaped groove can reduce the friction between the clamp and the thermal insulation layer, protecting the thermal insulation layer from being scratched.

[0020] In some technical solutions of the present utility model, it further includes a steel structure bracket arranged on the tube screen, the above-mentioned thermal insulation layer is arranged on the steel structure bracket, the above-mentioned accommodating member is provided with screws, and the screws pass through the thermal insulation layer and are connected to the steel structure bracket.

[0021] Using screws to fix the accommodating member on the steel structure frame can make the installation of the accommodating member more convenient and the installation and processing cost lower.

[0022] Compared with the prior art, the technical solution of the present utility model has at least the following advantages or beneficial effects:

[0023] The fixing device is provided with an accommodating member between the tube screen and the thermal insulation layer, and a sliding groove is arranged on the accommodating member. When the heat absorber works, the thermocouple wires of the thermocouple arranged in a bent manner in the accommodating space can effectively absorb the thermal displacement and prevent the thermocouple wires from getting stuck in the thermal insulation layer, better ensuring the reliability and accuracy of the thermocouple measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a fixing device for a thermocouple of a heat absorber tube screen according to an embodiment of the present utility model;

[0025] Figure 2 For Figure 1 the partial enlarged view of A in

[0026] Figure 3 It is a schematic partial structure of a fixing device for a thermocouple of a heat absorber tube screen according to an embodiment of the present utility model Figure 1 ;

[0027] Figure 4 It is a schematic partial structure of a fixing device for a thermocouple of a heat absorber tube screen according to an embodiment of the present utility model Figure 2 .

[0028] Reference numerals: 1 - tube screen, 2 - heat collecting block, 3 - thermal insulation layer, 4 - accommodating member, 5 - sliding groove, 6 - thermocouple, 7 - blind hole, 8 - clamp, 9 - fastening hole, 10 - arc-shaped groove, 11 - fastening screw, 12 - threaded hole, 13 - steel structure bracket, 14 - screw, 15 - thermocouple wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present utility model will be further described below with reference to the drawings.

[0030] Please refer to Figures 1 - 4, a thermocouple fixing device for a heat absorber tube screen, comprising a tube screen 1, a heat insulation layer 3 is provided on the backlight side of the tube screen 1, a heat collecting block 2 is provided between the tube screen 1 and the heat insulation layer 3, the heat collecting block 2 is detachably installed with a thermocouple 6, the thermocouple 6 includes a thermocouple wire 15, and a receiving member 4 with a receiving space is provided between the tube screen 1 and the heat insulation layer 3, and the above-mentioned receiving space houses the above-mentioned thermocouple wire 15 arranged in a bent manner with a certain length.

[0031] The principle of this fixing device: The receiving member 4 is snapped onto the heat insulation layer 3. After the heat insulation layer is installed, the receiving member fits with the tube screen 1. Both ends of the receiving space pass through both ends of the receiving member 4. The heat collecting block 2 is connected to the tube screen 1 by welding; the heat insulation layer 3 can be installed and fixed by a bracket provided on the tube screen 1, or can be fixed by metal parts such as iron wires; after the thermocouple wire 15 of the thermocouple 6 passes through the receiving member 4 from the receiving space, it can pass through the heat insulation layer 3. The position where it passes through can be the end of the tube screen 1 or the side of the tube screen 1. It is preferably considered to pass through from the side of the tube screen 1, which can reduce the length of the thermocouple wire 15 actually required by the thermocouple 6 to a certain extent; the heat collecting block 2 and the receiving member 4 can be arranged in a sequential and fitting manner, or can be arranged at intervals. When installing this device, first fix the measuring end of the thermocouple 6 on the heat collecting block 2, and then complete the setting of the receiving member 4. The receiving member 4 can be kept at a certain distance from the heat collecting block 2, and a certain margin of the thermocouple wire 15 of the thermocouple 6 is left in the receiving space of the receiving member 4, that is, the length of the thermocouple wire 15 has a redundant length adapted to the extreme thermal displacement change. The redundant length of the thermocouple wire 15 is limited by the receiving member. Generally, the allowable sliding deformation length of the thermocouple wire 15 needs to be greater than the length of the extreme thermal displacement. The staff can adjust according to actual experience during installation. Therefore, the bending is not limited to the illustrated manner. Subsequently, the thermocouple wire 15 of the thermocouple 6 passes through the receiving member 4 and passes out from the side close to the side of the tube screen 1, and then the heat insulation layer 3 is laid to cover the backlight side of the tube screen 1. The heat collecting block 2, the receiving member 4, and the part of the thermocouple wire 15 of the thermocouple 6 that passes out of the receiving member 4 are all located between the heat insulation layer 3 and the tube screen 1. The part of the thermocouple wire 15 of the thermocouple 6 remaining in the receiving space of the sliding slot 5 can be arranged in an S shape or a Z shape. After installation, under the high-temperature operating conditions of the heat absorber, the tube screen 1 expands and moves due to heat, the heat insulation layer 3 remains stationary, the receiving member 4 remains stationary, and the heat collecting block 2 and the thermocouple 6 move together with the tube screen 1. At this time, the bent thermocouple wire 15 of the thermocouple 6 located in the receiving space of the receiving member 4 is stretched or compressed. This design method can solve the problem that the thermocouple wire 15 of the thermocouple 6 is stuck in the heat insulation layer 3 caused by thermal displacement during the high-temperature operation of the heat absorber, and better ensure the stability of the thermocouple 6 measurement

[0032] As a preferred embodiment, the accommodating space is a sliding groove 5 which is disposed through the side of the heat collecting block 2 away from the tube screen 1, and the thermocouple wire 15 is inserted into the sliding groove 5.

[0033] In the above embodiment, the accommodating member 4 can be a concave member, and the accommodating space, that is, the sliding groove 5, is formed by welding and bending steel plates. In this design, the arrangement of the sliding groove 5 is more convenient for the layout and installation of the thermocouple wire 15.

[0034] As a preferred embodiment, the heat collecting block 2 is provided with a blind hole 7, the thermocouple 6 is disposed in the blind hole 7, and the heat collecting block 2 is provided with a positioning member for fixing the measuring end of the thermocouple 6 to the heat collecting block 2.

[0035] In the above embodiment, the blind hole 7 is a through hole that connects the surface layer and the inner layer without penetrating the entire plate and has a certain depth. The setting of the positioning member can further stabilize the connection between the thermocouple 6 and the heat collecting block 2, and reduce the phenomenon of the thermocouple 6 detaching from the heat collecting block 2 when the tube screen 1 in the heat absorber undergoes thermal displacement.

[0036] As a preferred embodiment, the central axis of the blind hole 7 is parallel to the central axis of the tube screen 1.

[0037] In the above embodiment, the central axis of the blind hole 7 and the central axis of the tube screen 1 are parallel. When the tube screen 1 undergoes thermal movement, driving the heat collecting block 2 and the thermocouple 6 to move, a force for separating the measuring end of the thermocouple 6 in the blind hole 7 from the blind hole 7 is generated. If the central axis of the blind hole 7 and the central axis of the tube screen 1 are parallel, the long axis is parallel to the direction of the external force, which can reduce the peak stress and relieve the damage caused by stress concentration of the heat collecting block 2 to a certain extent.

[0038] As a preferred embodiment, the positioning member is a fastening screw 11. The heat collecting block 2 is provided with a threaded hole 12 communicating with the blind hole 7. The central axis of the threaded hole 12 is perpendicular to the central axis of the blind hole 7, and the fastening screw 11 passes through the threaded hole 12 to abut the thermocouple 6 against the heat collecting block 2.

[0039] In the above embodiment, when the thermocouple 6 needs to be installed, first insert the measuring end of the thermocouple 6 into the blind hole 7, and then tighten the fastening screw 11 in the threaded hole 12. The end of the fastening screw 11 gradually brings the measuring end of the thermocouple 6 closer to the heat collecting block 2 to complete the fixation of the thermocouple 6. This design is convenient for installation and disassembly. In addition, a counterbore can be opened on the heat collecting block 2, and the fastening screw 11 is disposed in the counterbore to avoid friction between the screw 14 and the heat insulation layer 3 and reduce its loosening.

[0040] As a preferred embodiment, the positioning member described above is a clamp 8. A fastening hole 9 is provided through the heat collecting block 2, and the fastening hole 9 communicates with the blind hole 7. The clamp 8 passes through the fastening hole 9 to fix the thermocouple 6 on the heat collecting block 2.

[0041] In the above embodiment, the clamp 8 preferably uses a stainless steel clamp 8; when the thermocouple 6 needs to be installed, first insert the measuring end of the thermocouple 6 into the blind hole 7, and then insert one end of the stainless steel clamp 8 into the blind hole 7 through the fixing hole, pass through from the side of the thermocouple 6 close to the tube screen 1, and pass out through the fixing hole. Lock the two ends of the stainless steel clamp 8 that come out, and fix the position of the measuring end of the thermocouple 6 and the heat collecting block 2; when using the fastening screw 11 to fix the measuring end of the thermocouple 6, due to the influence of the movement of the tube screen 1 on the heat collecting block 2, it is easy to rub against the heat preservation layer 3, and then the fastening screw 11 often slips, resulting in poor contact between the thermocouple 6 and the heat collecting block 2, resulting in failure or inaccurate feedback of temperature changes. Replacing the fastening screw 11 with a stainless steel clamp 8 to fix the thermocouple 6 can effectively prevent the thermocouple 6 from slipping and failing; it is worth noting that in this design method, the clamp (8) is fixed on the heat collecting block 2 and is not directly connected to the tube screen 1, and at the same time, it also avoids blocking the incident light on the light-receiving side of the tube screen 1; the number of the clamps 8 and the number of the fastening holes 9 can be multiple and correspond one by one.

[0042] As a preferred embodiment, an arc-shaped groove 10 is provided on the side of the heat collecting block 2 away from the fastening hole 9. When the clamp 8 is in the installed state, the part exposed outside the heat collecting block 2 is embedded in the arc-shaped groove 10.

[0043] In the above embodiment, the setting of the arc-shaped groove 10 can reduce the friction between the clamp 8 and the heat preservation layer 3, protect the heat preservation layer 3 from being scratched, and to a certain extent, make the clamp 8 fit better with the heat collecting block 2, which helps the stability of the clamp 8.

[0044] As a preferred embodiment, it further includes a steel structure bracket 13 provided on the tube screen 1. The heat preservation layer 3 is provided on the steel structure bracket 13. The accommodating member 4 is provided with screws 14, and the screws 14 pass through the heat preservation layer 3 and are connected to the steel structure bracket 13.

[0045] In the above embodiment, the steel structure bracket 13 is welded on the backlight side of the tube screen 1. The heat preservation layer 3 is composed of multiple heat preservation material boards. A frame for fixing the heat preservation layer 3 is provided opposite on the steel structure bracket 13. Personnel install the heat preservation layer 3 into the frame, so that multiple heat preservation layers 3 are attached to the tube screen 1; the heat preservation layer 3 includes multiple heat preservation boards; using the screws 14 to fix the accommodating member 4 on the steel structure frame can effectively fix the accommodating member 4.

[0046] In summary, the embodiment of the present utility model provides a fixing device for the thermocouple of the heat absorber tube screen. The method of passing the clamp 8 through the heat collecting block 2 is adopted to replace the traditional method of fixing the thermocouple wire 15 of the thermocouple 6, which can effectively prevent the thermocouple wire 15 of the thermocouple 6 from slipping off and avoid the clamp 8 being exposed on the light-facing side; the accommodating member 4 and the sliding groove 5 are provided so that the thermocouple wire 15 of the thermocouple 6 can effectively absorb thermal displacement and prevent the thermocouple wire 15 of the thermocouple 6 from getting stuck in the heat insulation layer 3 under high-temperature operating conditions.

[0047] The above is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A fixed device for a thermocouple of a heat absorber tube screen, comprising a tube screen (1), a heat insulation layer (3) is provided on the backlight side of the tube screen (1), a heat collecting block (2) is arranged between the tube screen (1) and the heat insulation layer (3), the heat collecting block (2) is detachably installed with a thermocouple (6), the thermocouple (6) includes a thermocouple wire (15), and it is characterized in that, A receiving member (4) having a receiving space is provided between the tube panel (1) and the thermal insulation layer (3), and the receiving space receives the bent thermocouple wire (15) of a certain length.

2. The thermocouple fixing device for the heat absorber tube panel according to claim 1, wherein The accommodating space is a sliding groove (5), which is provided through the side of the heat collecting block (2) away from the tube panel (1), and the thermocouple wire (15) is provided through the sliding groove (5).

3. The thermocouple fixing device for the absorber tube panel according to claim 1 or 2, characterized in that, The heat collecting block (2) is provided with a blind hole (7), the thermocouple (6) is arranged in the blind hole (7), and a positioning piece for fixing the measuring end of the thermocouple (6) to the heat collecting block (2) is provided on the heat collecting block (2).

4. The thermocouple fixing device for the absorber tube panel according to claim 3, characterized in that, The central axis of the blind hole (7) is parallel to the central axis of the tube panel (1).

5. A thermocouple fixing device for a heat absorber tube panel according to claim 3, characterized in that The positioning member is a fastening screw (11), and the heat collecting block (2) is provided with a threaded hole (12) connected to the blind hole (7). The central axis of the threaded hole (12) and the central axis of the blind hole (7) are perpendicular to each other. The fastening screw (11) passes through the threaded hole (12) to abut the thermocouple (6) against the heat collecting block (2).

6. The thermocouple fixing device for the absorber tube panel according to claim 3, wherein The positioning member is a clamp (8), the heat collecting block (2) is provided with a fastening hole (9), the fastening hole (9) is connected to the blind hole (7), and the clamp (8) passes through the fastening hole (9) to fix the thermocouple (6) on the heat collecting block (2).

7. The thermocouple fixing device for the heat absorber tube panel according to claim 6, wherein, The heat collecting block (2) is provided with an arcuate groove (10) on the side away from the fastening hole (9); when the clamp (8) is in an installed state, the portion thereof exposed outside the heat collecting block (2) is embedded in the arcuate groove (10).

8. A thermocouple fixing device for a heat absorber tube screen according to claim 1 or 2, characterized in that, It also includes a steel structure support (13) arranged on the tube panel (1), the thermal insulation layer (3) is arranged on the steel structure support (13), and the accommodating member (4) is provided with a screw (14), and the screw (14) passes through the thermal insulation layer (3) and is connected to the steel structure support (13).

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