Vacuum ball probe for measuring the temperature of solid heat accumulators and method of installation

Abstract

The application discloses a vacuum ball probe for measuring the temperature of solid heat accumulator and a mounting method, and belongs to the technical field of high-voltage solid electric heat accumulator control and detection, wherein the temperature measuring probe is composed of a front hemisphere, a butt joint ring and a rear hemisphere, and forms a vacuum ball body; a heated cap is arranged at the core position of the ball body, the heated cap extends out of a probe hole arranged on the rear hemisphere through a connected probe pipeline, and is closed and welded with the probe hole; a fixing handle is coaxially sleeved on the probe pipeline, the fixing handle is welded and connected with the outer wall of the rear hemisphere, the fixing handle is welded and connected with the probe pipeline, and the space between the fixing handle and the probe pipeline is filled with heat preservation cotton; an air exhaust pipe is further connected to the rear hemisphere, a sealing structure is further arranged at the end of the air exhaust pipe, and the sealing structure is subjected to secondary brazing sealing by using brazing filler.

Description

Technical Field

[0001] This invention relates to the field of control and testing technology for high-voltage solid-state electric thermal storage furnaces. Specifically, it relates to a vacuum ball probe and its installation method that enables high-precision non-contact measurement of the thermal radiation temperature of a solid-state electric thermal storage furnace when measuring the temperature of the solid thermal storage body. Background Technology

[0002] In solid-state electric thermal storage furnaces directly powered by 10kV to 150kV operating voltages, thermocouples are typically mounted on infrared radiation receiving metal plates at a safe discharge distance from the solid thermal storage body, exceeding the operating voltage safety distance. This indirect temperature measurement method controls the solid thermal storage body's temperature. However, this method exposes the infrared radiation receiving metal plate to the air, causing the process of the metal plate receiving thermal radiation from the solid thermal storage body and dissipating heat through convection with the air to occur simultaneously. Furthermore, the lack of data collection on the ambient temperature change within the space where the metal plate is located and the distance between the metal plate and the solid thermal storage body are not used as correction parameters for accurately calculating the solid thermal storage body's temperature. This results in a stable temperature measurement accuracy error sometimes exceeding 200℃, leading to low measurement precision. The question is whether a technological improvement can be made to retain the convenience and safety advantages of indirect temperature measurement while achieving a level of accuracy comparable to direct insertion temperature measurement. This is particularly relevant for international markets where the risk of electric shock is extremely high, and where the economic losses from a discharge accident would be substantial. A high-precision indirect method for measuring the solid thermal storage body's temperature is therefore practically applicable. Summary of the Invention

[0003] In view of the above technical requirements, the purpose of this invention is to provide a vacuum ball probe and installation method for measuring the temperature of a solid heat storage body, aiming to solve the problem of low measurement accuracy in existing indirect temperature measurement methods for solid heat storage bodies.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] In the first aspect, a vacuum sphere probe for measuring the temperature of a solid heat storage body is provided. The temperature measuring probe consists of a front hemisphere connected to a rear hemisphere via a docking ring to form a vacuum sphere. A heat-receiving cap is provided at the core of the sphere. The heat-receiving cap extends through a probe pipe to a probe hole on the rear hemisphere and is sealed and welded to the probe hole. A fixing handle is coaxially fitted on the probe pipe. The fixing handle is welded to the outer wall of the rear hemisphere and to the probe pipe. The space between the fixing handle and the probe pipe is filled with heat-insulating cotton. An air extraction pipe is also connected to the rear hemisphere, and the end of the air extraction pipe is provided with a sealing structure.

[0006] Furthermore, the front hemisphere is a thin-shell hemisphere molded from a heat-resistant stainless steel plate with a thickness of 0.5mm to 2mm. The outer surface of the front hemisphere is sandblasted to a rough surface and then coated with a black light-absorbing high-temperature paint. The rear hemisphere is a thin-shell hemisphere molded from a heat-resistant stainless steel plate with a thickness of 0.5mm to 2mm. The inner surface of the rear hemisphere is mirror-polished. The rear hemisphere is equipped with a probe hole and an air extraction pipe.

[0007] Furthermore, the front and rear hemispheres are brazed together to form a vacuum sphere with a diameter of 50mm to 400mm.

[0008] Furthermore, the heating cap is a thin-shell hollow sphere with a diameter of 10mm to 30mm, molded from a heat-resistant stainless steel plate with a thickness of 0.5mm to 1mm. The inner wall is the temperature sampling area that contacts the thermocouple probe. The outer surface of the heating cap is sandblasted to form a rough surface and then coated with a black light-absorbing high-temperature paint. The inner cavity of the heating cap is sealed and welded to the probe tube.

[0009] Furthermore, the probe tube is made of heat-resistant stainless steel tube with a wall thickness of 0.5mm to 1mm, which is used as a channel for inserting and removing thermocouples with an inner diameter of 6mm to 15mm. The probe tube is then sealed and welded to the probe hole and the fixing handle in sequence.

[0010] Furthermore, the fixing handle is a support connection structure with an inner diameter of 30mm to 100mm, made of heat-resistant stainless steel tube with a wall thickness of 1.5mm to 3mm.

[0011] Furthermore, the suction pipe is made of heat-resistant stainless steel with a wall thickness of 0.5mm to 2mm, forming a capillary tube with an inner diameter of 0.5mm to 5mm, and the end of the suction pipe is equipped with a sealing structure.

[0012] Furthermore, the sealing structure is a part on the extraction pipe that is formed by external force to seal the inner hole. After the sealing structure is formed by compression, it is brazed with brazing filler metal for secondary sealing.

[0013] Secondly, a method for installing a vacuum sphere probe involves using a vacuum sphere probe for measuring the temperature of a solid heat storage body. The temperature-measuring probe, after having a thermocouple embedded in its probe tube, is inserted into an isolation cylinder on the insulation layer. The isolation cylinder is connected to the insulation layer. There is a detection distance of 0.6m to 2m between the mating ring between the front and rear hemispheres and the solid heat storage body. The space enclosed by the rear hemisphere of the vacuum sphere, the isolation cylinder, and the insulation layer is filled with aluminum silicate insulation cotton. A compensating thermocouple is inserted into the isolation cylinder on the insulation layer. The compensating thermocouple is exposed within the space enclosed by the front hemisphere of the vacuum sphere and the isolation cylinder. The probe of the compensating thermocouple and the temperature-measuring thermocouple are positioned equidistant from the solid heat storage body. This installation method is used for temperature detection of solid heat storage bodies with operating voltages of 10kV to 150kV.

[0014] Thirdly, a method for measuring the temperature of a solid heat storage body is proposed. This method employs a vacuum sphere probe to measure the temperature of the solid heat storage body. Based on the operating voltage of the solid heat storage body, the detection distance is obtained. The emissivity of the solid heat storage body is determined according to its material. The temperature range of the compensated thermocouple is determined based on the effective heat release temperature range of the solid heat storage body. A d-value parameter table is established based on the detection distance, the emissivity of the solid heat storage body, and the temperature range of the compensated thermocouple. Finally, the actual temperature of the solid heat storage body is calculated as: (Test temperature of the temperature probe × Reading value from the d-value parameter table) ÷ Emissivity of the solid heat storage body.

[0015] The technical solution adopted in this invention has the following advantages:

[0016] This technical solution employs a non-contact vacuum sphere probe for indirect temperature measurement. To improve measurement accuracy, the inner and outer walls of the front hemisphere, except for the brazed joints with the connecting ring, are coated with a high-temperature far-infrared nanocomposite ceramic material, making the front hemisphere resemble a blackbody in terms of thermal radiation characteristics. The inner wall of the rear hemisphere is treated with a mirror finish to increase its reflectivity, focusing the radiated heat energy from the solid heat storage body onto the heating cap. The ceramic layer on the heating cap is identical to that of the front hemisphere, absorbing heat energy with an emissivity of over 92%. This significantly improves measurement accuracy compared to existing radiation plate temperature measurement technologies. The temperature-measuring thermocouple is placed in a vacuum environment to prevent air convection from interfering with the temperature sampling area of ​​the thermocouple probe. A compensation thermocouple is added to collect the ambient temperature changes within the space where the vacuum sphere is located, correcting the temperature value of the temperature-measuring thermocouple and further improving measurement accuracy. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0018] Figure 1 This is a schematic diagram of the temperature measuring probe of the present invention;

[0019] Figure 2 This is a schematic diagram of the front hemisphere of the present invention;

[0020] Figure 3 This is a schematic diagram of the rear hemisphere structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the docking ring structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the docking ring of the present invention along direction A;

[0023] Figure 6 This is a schematic diagram of the installation structure of the present invention.

[0024] Explanation of icon numbers:

[0025] 1. Temperature probe; 1-1. Front hemisphere; 1-2. Rear hemisphere; 1-3. Docking ring; 1-4. Fixing handle; 1-5. Probe pipe; 1-6. Evacuation pipe; 1-7. Heated cap; 1-8. Insulation cotton; 1-9. Temperature measuring thermocouple; 1-10. Outer wall; 1-11. Inner wall; 1-12. Probe hole; 1-13. Evacuation hole; 1-14. Sealing structure; 1-15. Brazing material; 2. Compensating thermocouple; 3. Isolation cylinder; 4. Detection distance; 5. High temperature zone; 6. Insulation layer; 7. Solid heat storage body; 8. Aluminum silicate insulation cotton. Detailed Implementation

[0026] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Unless otherwise specified, the techniques used in the embodiments are conventional means well known to those skilled in the art.

[0027] In this embodiment, a vacuum sphere probe for measuring the temperature of a solid heat storage body is combined with... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 Explanation.

[0028] Figure 1 This is a schematic diagram of the structure of the temperature probe 1 of the present invention. The temperature probe 1 is composed of a front hemisphere 1-1 connected to a rear hemisphere 1-2 via a docking ring 1-3, forming a vacuum sphere. A heating cap 1-7 is provided at the core of the sphere. The heating cap 1-7 extends out of the probe hole 1-12 on the rear hemisphere 1-2 via a probe pipe 1-5 and is sealed and welded to the probe hole 1-12. A fixing handle 1-4 is coaxially fitted on the probe pipe 1-5. The fixing handle 1-4 is welded to the outer layer 1-10 of the rear hemisphere 1-2 and to the probe pipe 1-5. The space between the fixing handle 1-4 and the probe pipe 1-5 is filled with heat insulation cotton 1-8, which can be made of aluminum silicate. A vacuum tube 1-6 is also connected to the rear hemisphere 1-2. The end of the vacuum tube 1-6 is also provided with a sealing structure 1-14.

[0029] Figure 2This is a schematic diagram of the structure of the front hemisphere 1-1 of the present invention. The front hemisphere 1-1 is a thin-shell hemisphere molded from a heat-resistant stainless steel plate with a thickness of 0.5mm to 2mm. The outer wall 1-10 and inner wall 1-11 of the front hemisphere 1-1 are sandblasted to form a rough surface. Except for the weld joint that contacts the docking ring 1-3 for brazing and sealing, the surface is coated with a black light-absorbing high-temperature far-infrared nano-composite ceramic coating.

[0030] Figure 3 This is a schematic diagram of the structure of the rear hemisphere 1-2 of the present invention. The rear hemisphere 1-2 is a thin-shell hemisphere molded from a heat-resistant stainless steel plate with a thickness of 0.5mm to 2mm. The inner wall 1-11 of the rear hemisphere 1-2 has a mirror-polished surface.

[0031] Figure 4 This is a schematic diagram of the structure of the docking rings 1-3 of the present invention. Figure 5 This is a schematic diagram of the cross-sectional structure of the docking ring 1-3 of the present invention along direction A. The front hemisphere 1-1 and the rear hemisphere 1-2 are brazed and sealed together by the docking ring 1-3 to form a vacuum sphere with a diameter of 50mm to 400mm. The heating cap 1-7 is a thin-shell hollow sphere with a diameter of 10mm to 30mm, molded from a heat-resistant stainless steel plate with a thickness of 0.5mm to 1mm. The inner wall is the temperature sampling area that contacts the thermocouple probe. The outer surface of the heating cap 1-7 is sandblasted to a rough surface and then coated with a black light-absorbing high-temperature far-infrared nano-composite ceramic coating. The inner cavity of the heating cap 1-7 is sealed and welded to the probe tube 1-5. The probe tube 1-5 is made of a heat-resistant stainless steel tube with a wall thickness of 0.5mm to 1mm, forming a channel for inserting and removing thermocouples with an inner diameter of 6mm to 15mm. The probe tube 1-5 is sequentially and sealed and welded to the probe hole 1-12 and the fixing handle 1-4. The fixing handle 1-4 is a support connection structure made of heat-resistant stainless steel tube with a wall thickness of 1.5mm to 3mm and an inner diameter of 30mm to 100mm. The suction pipe 1-6 is a vacuum exhaust channel made of heat-resistant stainless steel tube with a wall thickness of 0.5mm to 2mm and an inner diameter of 0.5mm to 5mm. The suction pipe 1-6 is connected to the rear hemisphere 1-2 through the suction hole 1-13. The end of the suction pipe 1-6 is provided with a sealing structure 1-14. The sealing structure 1-14 is a part on the suction pipe 1-6 formed by external force to seal the inner hole. After the sealing structure 1-14 is formed by extrusion, it is brazed with brazing filler 1-15 for secondary sealing.

[0032] Figure 6This is a schematic diagram of the installation structure of the present invention. The area between the solid heat storage body 7 and the insulation layer 6 is a high-temperature zone 5. An isolation cylinder 3 is arranged within the high-temperature zone 5. The temperature measuring probe 1, with a built-in temperature measuring thermocouple 1-9, is inserted into the isolation cylinder 3 on the insulation layer 6. The isolation cylinder 3 is connected to the insulation layer 6. A detection distance 4 of 0.6m to 2m exists between the docking ring 1-3 between the front hemisphere 1-1 and the rear hemisphere 1-2 and the solid heat storage body 7. The space enclosed by the rear hemisphere 1-2 of the vacuum sphere, the isolation cylinder 3, and the insulation layer 6 is filled with aluminum silicate insulation cotton 8. A compensating thermocouple 2 is inserted into the isolation cylinder 3 on the insulation layer 6. The compensating thermocouple 2 is exposed within the space enclosed by the front hemisphere 1-1 of the vacuum sphere and the isolation cylinder 3, with the probe of the compensating thermocouple 2 and the temperature measuring thermocouple 1-9 positioned equidistant from the solid heat storage body 7. This installation method is used for temperature detection of a solid heat storage body 7 with a working voltage of 10kV to 150kV.

[0033] Based on the above-mentioned vacuum sphere probe and its installation method, temperature measurement is performed according to the following method. The completed vacuum sphere temperature probe 1 should have the following markings on the fixing handles 1-4: a) the specific value of the detection distance 4 (determined based on the probe's operating voltage); b) the emissivity of the solid heat storage body 7 (determined based on whether the solid heat storage body to be measured is magnesia brick or alumina brick); c) the temperature range of the compensating thermocouple 2 (determined based on the effective heat release temperature range of the solid heat storage body 7); establish d=f(a,b,c). When the vacuum sphere temperature probe 1 is calibrated, the operating conditions a and b are determined to be constants, so the parameter table for d=f(c) is provided. The d-value parameter table is as follows: Figure 6 In the simulated working environment shown, the temperature of the solid heat storage body 7 is adjusted according to the step temperature gradient. The actual temperature of the solid heat storage body is calculated as: the test temperature of the temperature probe 1 × d ÷ the emissivity of the solid heat storage body 7. The compensation thermocouple 2 adjusts the temperature of the solid heat storage body 7 in steps of 10℃ to 100℃ according to the temperature measurement accuracy requirements of the temperature probe 1. For each step increase in the temperature of the solid heat storage body 7, the corresponding temperature index value of the compensation thermocouple 2 is read and listed (the linearity of the temperature measurement value is good when the step temperature decreases). The correspondence table between the temperature index value of the compensation thermocouple 2 and the d value is attached to the fixed handle 1-4 as a correction parameter table for the temperature measurement of the temperature probe 1 and input into the temperature measuring instrument, which can improve the temperature measurement accuracy of the vacuum sphere temperature probe 1.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A vacuum sphere probe for measuring the temperature of a solid heat storage body, characterized in that: The temperature probe (1) is composed of a front hemisphere (1-1) connected to a rear hemisphere (1-2) via a docking ring (1-3), forming a vacuum sphere. A heating cap (1-7) is set at the core of the sphere. The heating cap (1-7) extends through the probe pipe (1-5) to the probe hole (1-12) on the rear hemisphere (1-2) and is sealed and welded to the probe hole (1-12). A fixing handle (1-4) is coaxially fitted on the probe pipe (1-5). The fixing handle (1-4) is welded to the outer wall (1-10) of the rear hemisphere (1-2). The fixing handle (1-4) is welded to the probe pipe (1-5). The space between the fixing handle (1-4) and the probe pipe (1-5) is filled with heat insulation cotton (1-8). The rear hemisphere (1-2) is also connected to an air extraction pipe (1-6), and the end of the air extraction pipe (1-6) is also provided with a sealing structure (1-14); the outer wall (1-10) of the front hemisphere (1-1) is sandblasted to form a rough surface and then coated with a black light-absorbing high-temperature paint; the inner wall (1-11) of the rear hemisphere (1-2) is mirror-polished, and the rear hemisphere (1-2) is provided with a probe hole (1-12) and an air extraction pipe (1-6); the heating cap (1-7) is a thin-shell hollow sphere, the inner wall of the heating cap (1-7) is the temperature sampling area of ​​the thermocouple probe, the outer surface of the heating cap (1-7) is sandblasted to form a rough surface and then coated with a black light-absorbing high-temperature paint, and the inner cavity of the heating cap (1-7) is sealed and welded to the probe pipe (1-5).

2. The vacuum sphere probe for measuring the temperature of a solid heat storage body according to claim 1, characterized in that: The front hemisphere (1-1) is a thin-shell hemisphere molded from a heat-resistant stainless steel plate with a thickness of 0.5mm to 2mm, and the rear hemisphere (1-2) is a thin-shell hemisphere molded from a heat-resistant stainless steel plate with a thickness of 0.5mm to 2mm.

3. The vacuum sphere probe for measuring the temperature of a solid heat storage body according to claim 1, characterized in that: The front hemisphere (1-1) and the rear hemisphere (1-2) are brazed and sealed together by a mating ring (1-3) to form a vacuum sphere with a diameter of 50mm to 400mm.

4. A vacuum sphere probe for measuring the temperature of a solid heat storage body according to claim 1, characterized in that: The heat-receiving cap (1-7) is molded from a heat-resistant stainless steel plate with a thickness of 0.5mm to 1mm, and the diameter of the heat-receiving cap (1-7) is 10mm to 30mm.

5. A vacuum sphere probe for measuring the temperature of a solid heat storage body according to claim 1, characterized in that: The probe tube (1-5) is made of heat-resistant stainless steel tube with a wall thickness of 0.5mm to 1mm and an inner diameter of 6mm to 15mm for inserting and removing thermocouples. The probe tube (1-5) is sequentially and sealed by welding to the probe hole (1-12) and the fixing handle (1-4).

6. A vacuum sphere probe for measuring the temperature of a solid heat storage body according to claim 1, characterized in that: The fixing handle (1-4) is a support connection structure with an inner diameter of 30mm to 100mm, made of heat-resistant stainless steel tube with a wall thickness of 1.5mm to 3mm.

7. A vacuum sphere probe for measuring the temperature of a solid heat storage body according to claim 1, characterized in that: The suction pipe (1-6) is a vacuum exhaust channel made of heat-resistant stainless steel with a wall thickness of 0.5mm to 2mm and an inner diameter of 0.5mm to 5mm. The end of the suction pipe (1-6) is equipped with a sealing structure (1-14).

8. A vacuum sphere probe for measuring the temperature of a solid heat storage body according to claim 1, characterized in that: The sealing structure (1-14) is a part on the air extraction pipe (1-6) formed by external force to seal the inner hole. After the sealing structure (1-14) is formed by extrusion, it is brazed with brazing filler (1-15) for secondary sealing.

9. A method for installing a vacuum sphere probe, using a vacuum sphere probe for measuring the temperature of a solid heat storage body as described in claim 1, characterized in that: The temperature probe (1) is inserted into the insulation cylinder (3) on the insulation layer (6) after the temperature measuring thermocouple (1-9) is built into the probe pipe (1-5). The insulation cylinder (3) is connected to the insulation layer (6). There is a detection distance (4) of 0.6m to 2m between the docking ring (1-3) between the front hemisphere (1-1) and the rear hemisphere (1-2) and the solid heat storage body (7). The space enclosed by the rear hemisphere (1-2) of the vacuum sphere, the insulation cylinder (3), and the insulation layer (6) The interior is filled with aluminum silicate insulation cotton (8), and the compensation thermocouple (2) is inserted into the isolation cylinder (3) on the insulation layer (6). The compensation thermocouple (2) is exposed in the space enclosed by the front hemisphere (1-1) of the vacuum sphere and the isolation cylinder (3), and the probe of the compensation thermocouple (2) and the temperature measuring thermocouple (1-9) are positioned at a distance from the solid heat storage body (7). This installation method is used for temperature detection of solid heat storage body (7) with working voltage of 10kV to 150kV.

10. A method for measuring the temperature of a solid heat storage body, using a vacuum sphere probe for measuring the temperature of a solid heat storage body as described in claim 1, characterized in that: Based on the working voltage of the solid heat storage body, the value of the detection distance (4) is obtained. Based on the material of the solid heat storage body (7), the emissivity of the solid heat storage body (7) is determined. Based on the effective heat release temperature range of the solid heat storage body (7), the temperature range of the compensation thermocouple (2) is determined. Based on the value of the detection distance (4), the emissivity of the solid heat storage body (7) and the temperature range of the compensation thermocouple (2), a d-value parameter table is established. Finally, the actual temperature of the solid heat storage body (7) is obtained as: the test temperature of the temperature probe (1) × the value read from the d-value parameter table ÷ the emissivity of the solid heat storage body (7).

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