Multi-point thermal resistance based on air floating support heat dissipation structure

Abstract

The application relates to the technical field of thermal resistances, and discloses a multi-point thermal resistance based on an air floatation supporting heat dissipation structure, which comprises a junction box, the junction box is detachably installed with an insulating framework through an upper connecting pipe arranged at the bottom of the junction box, the bottom of the insulating framework is fixedly connected with a resistance body, the circumferential outer surface of the upper connecting pipe is threadedly connected with a protection pipe used for protecting the resistance body, and the protection pipe is internally provided with an air floatation piece used for supporting the resistance body. The multi-point thermal resistance based on the air floatation supporting heat dissipation structure can effectively solve the problem that in the prior art, a mechanical supporting structure hinders the sufficient contact between a temperature sensing element and a measured medium, influences the heat transfer speed, and in the long-term use process of the thermal resistance, mechanical abrasion is easily generated due to the friction and vibration between the thermal resistance and the measured object, the supporting structure is loosened or damaged, and the normal work of the thermal resistance is influenced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal resistance, in particular to a multi-point thermal resistance based on air floating support heat dissipation structure. BACKGROUND

[0002] Thermal resistance, also known as RTD, is to use the resistance value of metal or metal oxide to change according to temperature change, let a certain current pass through the resistance element, and use the acquisition instrument to collect the voltage at both ends of the resistance element, and then calculate the resistance value according to Ohm's law, so as to deduce the temperature size.

[0003] In the prior art, the thermal resistance generally comprises a terminal block, an insulating framework, a protective sleeve and a temperature sensing element, the resistance wire of the temperature sensing element is uniformly wound on the insulating framework, and the insulating framework together with the temperature sensing element wound thereon is put into the protective sleeve. Mechanical support structure is used between the insulating framework and the protective sleeve to fix the resistance body in the middle of the protective sleeve. However, the mechanical support structure will hinder the full contact of the temperature sensing element with the measured medium, affect the heat transfer speed, and in the long-term use process of the thermal resistance, due to the friction and vibration effect between the thermal resistance and the measured object, mechanical wear is easy to occur, which leads to loosening or damage of the support structure, and further affects the normal work of the thermal resistance. SUMMARY

[0004] Technical problems to be solved

[0005] In view of the above shortcomings of the prior art, the present application provides a multi-point thermal resistance based on air floating support heat dissipation structure, which can effectively solve the problem that in the prior art, the mechanical support structure will hinder the full contact of the temperature sensing element with the measured medium, affect the heat transfer speed, and in the long-term use process of the thermal resistance, due to the friction and vibration effect between the thermal resistance and the measured object, mechanical wear is easy to occur, which leads to loosening or damage of the support structure, and further affects the normal work of the thermal resistance.

[0006] To achieve the above purpose, the present application is realized by the following technical scheme:

[0007] The present application provides a multi-point thermal resistance based on air floating support heat dissipation structure, comprising:

[0008] The terminal box is detachably installed with the insulating framework through the upper connecting pipe arranged at the bottom of the terminal box, and the bottom of the insulating framework is fixedly connected with the resistance body, the circumferential outer surface of the upper connecting pipe is threadedly connected with the protective tube for protecting the resistance body, and the protective tube is provided with the air floating piece for supporting the resistance body;

[0009] The air flotation element comprises a sleeve, the outer circumferential surface of the sleeve is fixedly connected to the inner wall of the protective tube, the outer circumferential surface of the sleeve is provided with an annular groove, and the annular groove is provided with a plurality of micropores distributed in an array along the circumference of the annular groove, and the interior of the protective tube is provided with a gas channel connected to the annular groove;

[0010] Wherein, a support member which can be used to limit the resistor body is provided in the sleeve.

[0011] Furthermore, the micropore is of an integrated design and includes a contraction section, a throat section, and a diffusion section. The contraction section is connected to the annular groove, and the gas channel is connected to an external gas input mechanism.

[0012] Furthermore, the support member includes a fixed tube, which is fixedly connected to the inner wall of the sleeve, and a moving block is slidably connected to the inside of the fixed tube, and the moving block is fixedly connected to a limiting arc plate that fits the outer surface of the circumference of the insulating frame on the side away from the fixed tube, and the limiting arc plates are provided with three and distributed in an array along the circumference of the insulating frame, and the outer surface of the circumference of the limiting arc plate is fixedly connected to a round wire spring connected to the surface of the fixed tube, and the limiting arc plate is fixedly connected to the limiting block on the side close to the insulating frame.

[0013] Furthermore, an annular limiting groove that fits with the limiting block is provided on the circumferential outer surface of the insulating skeleton near the resistor body, and an annular clamping groove is provided in the annular limiting groove, and an annular clamping block that fits with the annular clamping groove is fixedly connected to the side of the limiting block near the annular limiting groove.

[0014] Furthermore, a sliding hole is provided on the top of the fixed tube, and there are two sliding holes which are respectively connected to the fixed tube. A movable block is slidably connected in each of the sliding holes. The fixed tube is slidably connected to a sliding block which fits with the inclined surface of the movable block through a sliding groove provided on the top of the fixed tube. The bottom of the movable block close to the side of the limiting arc plate fits with the inclined surface of the movable block.

[0015] Furthermore, an abutment block is slidably connected in the fixed tube, and the top inclined surface of the abutment block fits with the bottom inclined surface of the movable block on the side away from the moving block. The fixed tube is fixedly connected to a return spring connected to the surface of the abutment block through a support plate arranged at its end.

[0016] Furthermore, a diversion channel connected to the gas channel is opened in the sleeve.

[0017] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] The present invention is provided with an air float and a support member, which utilizes the compressibility and good thermal conductivity of the gas to form a uniform air film around the resistor, reducing the thermal resistance and heat transfer unevenness caused by mechanical contact, and at the same time isolating the influence of the external ambient temperature change on the resistor, so that the resistor can more accurately measure the true temperature of the measured medium. The resistor is isolated from other components by the air film to avoid direct mechanical contact, greatly reducing friction and wear, and reducing the mechanical stress on the resistor, thereby extending the service life of the thermal resistor and reducing the replacement frequency of the thermal resistor. The limiting arc plate applies uniform pressure to the insulating skeleton from different directions, so that it is evenly supported in the circumferential direction, thereby ensuring that the insulating skeleton is in the center position of the protective tube, ensuring that the central axes of the resistor and the protective tube coincide with each other, and ensuring that the gap between the resistor and the protective tube of the thermal resistor is uniform. The gas can flow evenly in the gap to form a stable air film, thereby effectively isolating the external vibration and impact, while ensuring the uniformity of heat transfer and improving the accuracy of the temperature measurement of the thermal resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0020] Figure 1 It is a three-dimensional structural diagram of an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of a protection tube according to an embodiment of the present invention;

[0022] Figure 3 For the embodiment of the present invention Figure 2 A schematic diagram of the structure at center A;

[0023] Figure 4 This is a schematic structural diagram of a cross-section of a casing according to an embodiment of the present invention;

[0024] Figure 5 For the embodiment of the present invention Figure 4 A magnified schematic diagram of the structure at point B in the middle;

[0025] Figure 6 This is a schematic structural diagram of a three-dimensionally separated support member according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the cross-sectional structure of the diversion channel according to an embodiment of the present invention;

[0027] Figure 8This is a schematic diagram of the cross-sectional structure of the casing and the protective tube according to an embodiment of the present invention;

[0028] Figure 9 For the embodiment of the present invention Figure 8 Enlarged schematic diagram of the structure at point C in the middle.

[0029] The numbers in the figure represent: 1. junction box; 11. insulation frame; 12. resistor; 13. protective tube; 14. air float; 141. sleeve; 142. ring groove; 143. micropore; 144. gas channel; 15. support; 151. fixed tube; 1511. sliding hole; 1512. movable block; 1513. sliding block; 152. moving block; 153. limiting arc plate; 1531. round wire spring; 1532. limiting block; 1533. annular clamping block; 154. annular limiting groove; 1541. annular clamping groove; 155. abutment block; 1551. reset spring; 156. diversion channel. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] The present invention will be further described below with reference to the embodiments.

[0032] Example:

[0033] See also Figures 1-9 The present invention provides a technical solution: a multi-point thermal resistor based on an air-floating support heat dissipation structure, comprising:

[0034] The junction box 1 has an insulating frame 11 detachably mounted on a top pipe at its bottom, and a resistor 12 is fixedly connected to the bottom of the insulating frame 11. A protective tube 13 for protecting the resistor 12 is threadedly connected to the outer circumferential surface of the top pipe, and an air float 14 is provided within the protective tube 13 for supporting the resistor 12.

[0035] The air flotation element 14 includes a sleeve 141, the outer circumferential surface of the sleeve 141 is fixedly connected to the inner wall of the protective tube 13, and the outer circumferential surface of the sleeve 141 is provided with an annular groove 142, and the annular groove 142 is provided with a plurality of micropores 143, and the micropores 143 are provided with a plurality of micropores 143 and are distributed in an array along the circumference of the annular groove 142. The protective tube 13 is provided with a gas channel 144 connected to the annular groove 142.

[0036] A support member 15 is provided in the sleeve 141 for limiting the position of the resistor 12 .

[0037] The micropore 143 is an integrated design, and includes a contraction section, a throat section, and a diffusion section. The contraction section is connected to the annular groove 142 , and the gas channel 144 is connected to an external gas input mechanism.

[0038] The support member 15 includes a fixed tube 151, which is fixedly connected to the inner wall of the sleeve 141. A moving block 152 is slidably connected to the inside of the fixed tube 151, and the moving block 152 is fixedly connected to a limiting arc plate 153 that fits the outer surface of the circumference of the insulating frame 11 on the side away from the fixed tube 151. The limiting arc plates 153 are provided in three and are distributed in an array along the circumference of the insulating frame 11. The outer surface of the limiting arc plate 153 is fixedly connected to a round wire spring 1531 connected to the surface of the fixed tube 151, and the limiting arc plate 153 is fixedly connected to the side close to the insulating frame 11 with a limiting block 1532.

[0039] An annular limiting groove 154 that fits with the limiting block 1532 is provided on the circumferential outer surface of the insulating skeleton 11 near the resistor body 12, and an annular clamping groove 1541 is provided in the annular limiting groove 154. An annular clamping block 1533 that fits with the annular clamping groove 1541 is fixedly connected to the limiting block 1532 near the annular limiting groove 154.

[0040] A sliding hole 1511 is provided at the top of the fixed tube 151, and there are two sliding holes 1511 that are respectively connected to the fixed tube 151. A movable block 1512 is slidably connected in the sliding hole 1511. The fixed tube 151 is slidably connected to a sliding block 1513 that fits with the inclined surface of the movable block 1512 through a sliding groove provided at the top thereof. The bottom of the movable block 1512 near the side of the limiting arc plate 153 fits with the inclined surface of the movable block 152.

[0041] An abutment block 155 is slidably connected inside the fixed tube 151, and the top inclined surface of the abutment block 155 fits into the bottom inclined surface of the movable block 1512 on the side away from the moving block 152. The fixed tube 151 is fixedly connected to a return spring 1551 connected to the surface of the abutment block 155 through a support plate set at its end.

[0042] A diversion channel 156 communicating with the gas channel 144 is defined in the sleeve 141 .

[0043] The principle and advantages of the multi-point thermal resistor based on the air-floating support heat dissipation structure:

[0044] During actual use, the operator installs the thermistor at the required detection position according to the installation requirements of the thermistor, and at the same time connects the connecting pipe on the gas channel 144 to the external gas input mechanism. After the thermistor is installed, the external gas input mechanism will input gas into the gas channel 144, and use the annular groove 142 and micropores 143 to pass high-pressure gas between the resistor body 12 and the protective tube 13. The gas will form a uniform gas film in the narrow gap. This gas film has a certain degree of rigidity and damping, which can provide support and suspend the resistor body 12 to avoid mechanical contact with it. The gas film can effectively isolate external vibrations and shocks, and play a role in buffering and shock absorption. The low thermal conductivity and fluidity of the gas help maintain the temperature uniformity around the thermistor and improve the heat transfer efficiency, thereby ensuring that the thermistor can accurately measure the temperature of the object being measured.

[0045] Because micropore 143 utilizes an integrated design and comprises a contraction section, a throat, and a diffuser section, when gas within gas channel 144 enters micropore 143 along annular groove 142, it first enters the contraction section. As the gas flows through the contraction section, the channel's cross-sectional area gradually decreases, causing the gas flow rate to gradually increase. This increased flow rate reduces the gas's static pressure, creating a certain negative pressure, which facilitates rapid gas flow toward the throat and creates conditions for high-speed gas formation in the throat. The throat is the smallest section of micropore 143 in cross-sectional area. After accelerating in the contraction section, the gas reaches its highest velocity in the throat, forming a high-speed jet. At this point, the gas's kinetic energy is maximized and its static pressure is minimized, providing the initial impetus for the formation of an air film. As the gas passes through the throat and enters the diffuser section, the diffuser's cross-sectional area gradually increases, causing the gas flow rate to gradually decrease and the static pressure to gradually recover. This allows the gas to diffuse evenly around the thermal resistor, forming an air film with a certain pressure and thickness. Furthermore, the diffuser section further uniformizes the gas pressure distribution within the air film, enhancing the film's stability and load-bearing capacity.

[0046] When the external gas input mechanism inputs gas into the gas channel 144, the gas will enter the diversion channel 156 along the gas channel 144, and the high-speed gas will pass through the side of the fixed tube 151 away from the limiting arc plate 153. When the gas flows at high speed near the fixed tube 151, according to Bernoulli's principle, the pressure is low where the flow rate is high, and high where the flow rate is low. Because the gas flow rate at the end of the fixed tube 151 increases sharply, the pressure there decreases. The end of the fixed tube 151 away from the high-speed gas is connected to the atmosphere, maintaining atmospheric pressure, thereby forming a pressure difference, which can push the abutment block 155 to move toward the low-pressure end (the high-speed airflow end), and the return spring 1551 is compressed. As the abutment block 155 moves, the inclined surface on the top of the abutment block 155 will contact and squeeze the inclined surface on the bottom of the movable block 1512 (away from the limiting arc plate 153), so that the movable block 1512 (away from the limiting arc plate 153) will move upward, and with the cooperation of the sliding block 1513, the movable block 1512 (close to the limiting arc plate 153) will move downward. As the movable block 1512 (close to the limiting arc plate 153) and the moving block 152 contact and squeeze each other, the moving block 152 will drive the limiting arc plate 153 to approach the insulating frame 11 until the limiting arc plate 153 and the outer surface of the circumference of the insulating frame 11 are in contact with each other, and at the same time the round wire spring 1531 is stretched. After the limiting arc plate 153 and the circumferential outer surface of the insulating frame 11 are fitted together, the limiting block 1532 in the limiting arc plate 153 will be engaged in the annular limiting groove 154, and the annular clamping block 1533 on the limiting block 1532 will be engaged with the annular clamping groove 1541, thereby completing the support and fixation of the insulating frame 11, which can prevent the resistor body 12 from shaking when the thermal resistor is used under vibration conditions, affecting the normal use of the resistor body 12.

[0047] When the external gas input mechanism stops, the reset spring 1551 will restore to its initial position, that is, the abutment block 155 will move to its initial position with the cooperation of the reset spring 1551. Since the movable block 1512 (away from the limiting arc plate 153) loses the limitation of the abutment block 155, the movable block 1512 (away from the limiting arc plate 153) will move along the sliding hole 1511 to the fixed tube 151 with the cooperation of its own gravity. In conjunction with the movable block 1512 (close to the limiting arc plate 153), the sliding block 1513 and the round wire spring 1531, the limiting arc plate 153 can gradually separate from the circumferential outer surface of the insulating frame 11, thereby releasing the support and fixation of the insulating frame 11, which is convenient for later replacement and maintenance.

[0048] It is worth noting that three limiting arc plates 153 are used to simultaneously approach the insulating frame 11 to support and secure the insulating frame 11. The number of limiting arc plates 153 can be selected based on actual needs; three are used here. The three limiting arc plates 153 simultaneously adhere to the insulating frame 11, forming a three-point support structure that provides greater stability and strength. Compared to single-point or two-point support, three-point support can better disperse the external forces exerted on the insulating frame 11, reducing localized excessive forces and enhancing the stability of the entire support structure.

[0049] The present invention adopts an air-floating support assembly, which has the following advantages:

[0050] Advantage 1: The air floating member 14 makes the heat transfer between the resistor body 12 of the thermal resistor and the measured medium more stable and uniform. By utilizing the compressibility and good thermal conductivity of the gas, a uniform air film is formed around the resistor body 12, reducing the thermal resistance and heat transfer unevenness caused by mechanical contact. At the same time, the air floating support can isolate the influence of the external environment temperature change on the resistor body 12, so that the resistor body 12 can more accurately measure the real temperature of the measured medium, the measurement accuracy is significantly improved, and it can more accurately reflect the temperature change of the measured object.

[0051] Advantage 2: Compared with the mechanical support method of traditional thermal resistors, the air float 14 isolates the resistor 12 from other components through the air film, avoiding direct mechanical contact, greatly reducing friction and wear, and can also effectively buffer external impact and vibration, reducing the mechanical stress on the resistor 12, thereby extending the service life of the thermal resistor, reducing the replacement frequency of the thermal resistor, reducing maintenance costs and downtime, and improving the continuity and reliability of industrial production.

[0052] Advantage three: no complicated mechanical connections and fixing devices are required, which simplifies the installation steps and makes the installation process more convenient. Since the use of mechanical parts is reduced, the complexity and workload of maintenance are reduced, the installation efficiency is improved, the equipment installation time is shortened, and the maintenance difficulty and cost are also reduced.

[0053] Advantage four: by allowing the gas to flow at high speed near the fixed tube 151, low pressure is formed at the end of the fixed tube 151, and a pressure difference is formed with the atmospheric pressure at the end of the fixed tube 151 away from the high-speed gas, which cleverly provides power for the movement of the abutment block 155. No additional power device is required, the structure is simple, energy-saving and efficient, and during the fixing process, the limit block 1532 in the limit arc plate 153 is engaged with the annular limit groove 154, and the annular clamping block 1533 on the limit block 1532 is engaged with the annular clamping groove 1541. This multiple clamping structure makes the fixation of the insulating frame 11 more stable and reliable, and can effectively prevent the insulating frame 11 from displacement or shaking during the operation of the thermal resistor.

[0054] Advantage five: the limiting arc plate 153 applies uniform pressure to the insulating skeleton 11 from different directions, so that it is evenly supported in the circumferential direction, thereby ensuring that the insulating skeleton 11 is in the center position of the protective tube 13, ensuring that the central axes of the resistor body 12 and the protective tube 13 coincide with each other, and ensuring that the gap between the resistor body 12 and the protective tube 13 of the thermistor is uniform. The gas can flow evenly in the gap to form a stable air film, thereby effectively isolating external vibration and impact, while ensuring the uniformity of heat transfer and improving the accuracy of the temperature measurement of the thermistor.

[0055] Advantage six: The micropore 143 adopts an integrated design and is provided with a contraction section, a throat and a diffusion section. When the gas passes through the micropore 143, the cross-sectional area of ​​the micropore 143 gradually changes, and the gas flow rate will change, so that the static pressure can change synchronously, so that the gas can be evenly diffused around the thermal resistor to form an air film with a certain pressure and thickness. The diffusion section can also make the gas pressure distribution in the air film more uniform, thereby enhancing the stability and carrying capacity of the air film.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-point thermal resistor based on an air-floating support heat dissipation structure, characterized in that: include: A junction box (1), wherein the junction box (1) is detachably mounted with an insulating frame (11) via an upper pipe provided at the bottom thereof, and a resistor (12) is fixedly connected to the bottom of the insulating frame (11); a protective tube (13) for protecting the resistor (12) is threadedly connected to the circumferential outer surface of the upper pipe, and an air float (14) for supporting the resistor (12) is provided in the protective tube (13); The air flotation element (14) comprises a sleeve (141), the outer circumferential surface of the sleeve (141) is fixedly connected to the inner wall of the protective tube (13), the outer circumferential surface of the sleeve (141) is provided with an annular groove (142), and the annular groove (142) is provided with a plurality of micropores (143) and distributed in an array along the circumference of the annular groove (142), and the protective tube (13) is provided with a gas channel (144) connected to the annular groove (142); Wherein, a support member (15) is provided in the sleeve (141) and can be used to limit the position of the resistor (12).

2. The multi-point thermal resistor based on an air-floating support heat dissipation structure according to claim 1, characterized in that: The micropore (143) is of an integrated design and comprises a contraction section, a throat section and a diffusion section. The contraction section is connected to the annular groove (142), and the gas channel (144) is connected to an external gas input mechanism.

3. The multi-point thermal resistor based on an air-floating support heat dissipation structure according to claim 1, characterized in that: The support member (15) comprises a fixed tube (151), wherein the fixed tube (151) is fixedly connected to the inner wall of the sleeve (141), and a moving block (152) is slidably connected inside the fixed tube (151), and a limiting arc plate (153) is fixedly connected to the side of the moving block (152) away from the fixed tube (151) and is in contact with the outer circumferential surface of the insulating frame (11), and the limiting arc plates (153) are provided with three and are distributed in an array along the circumference of the insulating frame (11), and a round wire spring (1531) connected to the surface of the fixed tube (151) is fixedly connected to the outer circumferential surface of the limiting arc plate (153), and the limiting arc plate (153) is fixedly connected to the side close to the insulating frame (11) with the limiting block (1532).

4. The multi-point thermal resistor based on an air-floating support heat dissipation structure according to claim 1, characterized in that: An annular limiting groove (154) is provided on the circumferential outer surface of the insulating skeleton (11) near the resistor body (12), and the limiting block (1532) is fitted with an annular clamping groove (1541). An annular clamping block (1533) is fixedly connected to the side of the limiting block (1532) near the annular limiting groove (154), and the limiting block (1532) is fitted with the annular clamping groove (1541).

5. The multi-point thermal resistor based on an air-floating support heat dissipation structure according to claim 3, characterized in that: The fixed tube (151) is provided with a sliding hole (1511) at the top, and the sliding holes (1511) are provided with two and are respectively connected to the fixed tube (151). A movable block (1512) is slidably connected in each of the sliding holes (1511). The fixed tube (151) is slidably connected to a sliding block (1513) that fits the inclined surface of the movable block (1512) through a sliding groove provided at the top thereof. The bottom of the movable block (1512) on the side close to the limiting arc plate (153) fits the inclined surface of the movable block (152).

6. The multi-point thermal resistor based on an air-floating support heat dissipation structure according to claim 5, characterized in that: An abutment block (155) is slidably connected inside the fixed tube (151), and the top inclined surface of the abutment block (155) is in contact with the bottom inclined surface of the movable block (1512) on the side away from the movable block (152). The fixed tube (151) is fixedly connected to a return spring (1551) connected to the surface of the abutment block (155) through a support plate provided at its end.

7. The multi-point thermal resistor based on an air-floating support heat dissipation structure according to claim 1, characterized in that: A diversion channel (156) communicating with the gas channel (144) is provided in the sleeve (141).

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