Online monitoring and evaluating system and monitoring and evaluating method for insulating layer of continuous purification furnace
By installing multiple sets of temperature sensors and analysis modules on the continuous purification furnace, the temperature and water flow data of the insulation layer are comprehensively monitored, which solves the problem of being unable to judge the insulation effect, realizes online evaluation and timely maintenance, and ensures equipment safety.
Patent Information
- Application Number
- CN202511221823.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-29
- Publication Date
- 2025-10-14
AI Technical Summary
The existing technology is unable to accurately judge the insulation effect of the insulation layer of the continuous purification furnace, which leads to difficulties in production and maintenance and poses a safety hazard.
Multiple sets of insulation layer temperature sensors, analysis modules TISA, water inlet temperature sensors, water outlet temperature sensors and water flow sensors are used to monitor and evaluate the insulation effect of the insulation layer through comprehensive comparison of test data.
Accurate online monitoring of the insulation layer of the continuous purification furnace is achieved, and unqualified insulation effects are discovered in a timely manner to avoid equipment damage and ensure production safety.
Smart Images
Figure CN120777902A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of continuous purification furnaces, and in particular to an online monitoring and evaluation system for a continuous purification furnace insulation layer and a monitoring and evaluation method thereof. Background Art
[0002] The continuous purification furnace is the core equipment for the production of high-purity graphite powder. Compared with traditional batch furnaces such as Acheson furnace and vacuum purification furnace, it has the advantages of high output, low energy consumption and good product consistency.
[0003] The graphite powder purification furnace adopts a pusher-boat type furnace. The main body of the pusher-boat furnace is generally composed of a feed chamber, heating section, cooling section, and discharge chamber. The heating section adopts resistance heating or induction heating. The heating section is generally insulated with blanket insulation materials, including soft carbon felt, soft graphite felt, and hard composite felt. The insulation material is fixed to the steel frame by carbon ropes and carbon / carbon rods.
[0004] During long-term operation of a continuous purification furnace, the insulation material undergoes a certain degree of ablation and oxidation erosion, gradually deteriorating its insulation effectiveness. Because the continuous purification furnace is a fully enclosed structure, the extent of ablation and erosion of the insulation material cannot be observed, nor can the insulation layer's effectiveness be directly assessed. This creates difficulties in production and maintenance, and can even lead to boat jams due to structural damage to the insulation layer, posing a significant safety hazard. Summary of the Invention
[0005] The purpose of the present invention is to overcome the above technical deficiencies, provide an online monitoring and evaluation system for the insulation layer of a continuous purification furnace and a monitoring and evaluation method thereof, and solve the technical problem of how to accurately and directly judge the insulation effect of the insulation layer in the prior art.
[0006] In order to achieve the above technical objectives, the technical solution of the present invention provides an online monitoring and evaluation system for the insulation layer of a continuous purification furnace, including multiple insulation layer temperature sensors, an analysis module TISA (i.e., Temperature Indication SwitchAlarm), an inlet water temperature sensor, an outlet water temperature sensor and a water flow sensor; multiple groups of the insulation layer temperature sensors are arranged in different temperature zones in the direction of the furnace body; the insulation layer temperature sensor collects temperature data of the insulation layer, the inlet water temperature sensor and the outlet water temperature sensor respectively detect the inlet water temperature and the outlet water temperature of the water-cooled furnace shell, and the water flow sensor detects the water flow of the water-cooled furnace shell, and the above data are all transmitted to the analysis module TISA; the analysis module TISA comprehensively compares the detection data with the set data to monitor and evaluate the insulation effect of the insulation layer of the continuous purification furnace.
[0007] In any embodiment, the water inlet temperature sensor, the water outlet temperature sensor and the water flow sensor are respectively installed on the water inlet pipe and the water outlet pipe of the water cooling jacket; and / or, each group of the insulation layer temperature sensors includes multiple temperature sensors, and the multiple temperature sensors are gradually distributed from close to the inner wall of the insulation layer to close to the outer wall of the insulation layer.
[0008] In any embodiment, there are three groups of insulation layer temperature sensors in total, which are sequentially arranged in different temperature zones in the direction of the furnace body; the number of temperature sensors in each group of insulation layer temperature sensors is 8-10.
[0009] In any embodiment, the insulation layer temperature sensor is fixed on the furnace shell, and the detection end of the insulation layer temperature sensor contacts the insulation layer; the thermocouple of the insulation layer temperature sensor passes through the furnace shell and is sealed by a sealing assembly.
[0010] In any embodiment, the insulation layer temperature sensor is fixed to the furnace shell via a heat-resistant metal block.
[0011] In any embodiment, the sealing assembly includes a clamping nut, a deformable sealing block, a sealing seat and a pressure block; the sealing seat is fixed at the mounting hole position of the furnace shell to provide mounting support for the entire sealing assembly; the deformable sealing block is sleeved on the thermocouple and located between the thermocouple and the sealing seat to fill the gap and initially achieve a sealing effect; the pressure block is sleeved on the outside of the thermocouple and located on the outside of the deformable sealing block. The pressure block is threadedly connected to the sealing seat through the clamping nut. Under the action of the clamping nut, the pressure block tightly squeezes the deformable sealing block between the sealing seat and the thermocouple, causing the deformable sealing block to deform, thereby further enhancing the sealing performance.
[0012] In any embodiment, the deformable sealing block is a rubber sealing block.
[0013] In addition, the present invention also proposes a monitoring and evaluation method for the online monitoring and evaluation system for the insulation layer of the continuous purification furnace, comprising: using the temperature value and water flow value of the new continuous purification furnace after debugging as the set data;
[0014] If any ratio of the detection data to the set data exceeds the set threshold, it is judged that the thermal insulation effect is unqualified.
[0015] In any embodiment, the set threshold is 1.1-1.2.
[0016] In any embodiment, the detected water inlet temperature value, water outlet temperature value and water flow value are T b 、T a and F, the set water inlet temperature, water outlet temperature and water flow rate are T sb 、T saand F s , detect the operation data (T a -T b )×F and set operation data (T sa -T sb )×F s If the ratio exceeds the set threshold of 1.1-1.2, the thermal insulation effect is judged to be unqualified.
[0017] Compared with the prior art, the beneficial effects of the present invention include: the online monitoring and evaluation system for the insulation layer of the continuous purification furnace proposed in the present invention is characterized in that it includes an insulation layer temperature sensor, an analysis module TISA, an inlet water temperature sensor, an outlet water temperature sensor and a water flow sensor; multiple groups of the insulation layer temperature sensors are arranged in different temperature zones in the direction of the furnace body; the temperature sensor collects temperature data of the insulation layer, the inlet water temperature sensor and the outlet water temperature sensor respectively detect the inlet water temperature and the outlet water temperature of the water-cooled furnace shell, and the water flow sensor detects the water flow of the water-cooled furnace shell, and the above data are all transmitted to the analysis module TISA; the analysis module TISA monitors and evaluates the insulation effect of the insulation layer of the continuous purification furnace by comprehensively comparing the detection data with the set data. If the insulation effect is unqualified, the equipment can be inspected and repaired in terms of insulation; thereby achieving accurate and direct judgment of the insulation effect of the insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural diagram of the online monitoring and evaluation system for the insulation layer of a continuous purification furnace in Example 1 of the present invention.
[0019] Figure 2 This invention Figure 1 Section view along plane AA.
[0020] Figure 3 It is a schematic structural diagram of the sealing assembly of Example 1 of the present invention.
[0021] Explanation of the accompanying symbols: 1. Insulation layer temperature sensor; 11. Insulation layer temperature sensor of group A; 111. Temperature sensor; 12. Insulation layer temperature sensor of group B; 13. Insulation layer temperature sensor of group C; 2. Analysis module TISA; 3. Water inlet temperature sensor; 4. Water outlet temperature sensor; 5. Water flow sensor; 6. Furnace shell; 7. Sealing assembly; 71. Pressing nut; 72. Rubber sealing block; 73. Sealing seat; 74. Pressing block; 81. Water inlet pipe; 82. Water outlet pipe; 9. Insulation layer. DETAILED DESCRIPTION
[0022] The "ranges" disclosed herein are defined in terms of lower and upper limits, where a given range is defined by selecting a lower limit and an upper limit, and the selected lower and upper limits define the boundaries of the particular range. Ranges defined in this manner can be inclusive or exclusive of the end values and can be combined arbitrarily, i.e., any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60 to 120 and 80 to 110 are listed for a particular parameter, it is understood that ranges of 60 to 110 and 80 to 120 are also contemplated. Furthermore, if minimum range values of 1 and 2 are listed, and if maximum range values of 3, 4, and 5 are listed, the following ranges are all contemplated: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. In this application, unless otherwise indicated, the numerical range "a to b" is a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.
[0023] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.
[0024] Unless otherwise specified, the term "or" is used in this application to be inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied if any of the following conditions are met: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).
[0025] This specific embodiment provides an online monitoring and evaluation system for the insulation layer of a continuous purification furnace, including multiple groups of insulation layer temperature sensors, an analysis module TISA, an inlet water temperature sensor, an outlet water temperature sensor and a water flow sensor; the multiple groups of the insulation layer temperature sensors are arranged in different temperature zones in the direction of the furnace body; the insulation layer temperature sensors collect temperature data of the insulation layer, the inlet water temperature sensor and the outlet water temperature sensor respectively detect the inlet water temperature and the outlet water temperature of the water-cooled furnace shell, and the water flow sensor detects the water flow of the water-cooled furnace shell, and the above data are all transmitted to the analysis module TISA; the analysis module TISA monitors and evaluates the insulation effect of the insulation layer of the continuous purification furnace by comprehensively comparing the detection data with the set data.
[0026] In some embodiments, the water inlet temperature sensor, the water outlet temperature sensor and the water flow sensor are respectively installed on the water inlet pipe and the water outlet pipe of the water cooling jacket; each group of the insulation layer temperature sensors includes multiple temperature sensors, and the multiple temperature sensors are gradually distributed from the inner wall close to the insulation layer to the outer wall close to the insulation layer; each group of the insulation layer temperature sensors includes multiple sensors, and the multiple temperature sensors are distributed from the inner wall close to the insulation layer to the outer wall gradually close to the insulation layer; there are three groups of insulation layer temperature sensors in total, which are arranged in different temperature zones in the direction of the furnace body in sequence; the number of temperature sensors in each group of insulation layer temperature sensors is 8-10; the insulation layer temperature sensor adopts a soft couple, which is fixed on the furnace shell by a heat-resistant metal block, and the detection end of the insulation layer temperature sensor is in contact with the insulation layer; the thermocouple of the insulation layer temperature sensor passes through the furnace shell and is sealed by a sealing assembly.
[0027] In some embodiments, the sealing assembly includes a clamping nut, a deformable sealing block, a sealing seat and a pressure block; the sealing seat is fixed at the mounting hole position of the furnace shell to provide mounting support for the entire sealing assembly; the deformable sealing block is sleeved on the thermocouple and located between the thermocouple and the sealing seat to fill the gap and initially achieve a sealing effect; the pressure block is sleeved on the outside of the thermocouple and located on the outside of the deformable sealing block. It is threadedly connected to the sealing seat through the clamping nut. Under the action of the clamping nut, the pressure block tightly squeezes the deformable sealing block between the sealing seat and the thermocouple, causing the deformable sealing block to deform, thereby further enhancing the sealing performance.
[0028] In some embodiments, the deformable sealing block is a rubber sealing block.
[0029] This specific embodiment also provides a monitoring and evaluation method of an online monitoring and evaluation system for a continuous purification furnace insulation layer, comprising: using a new temperature value of the debugged continuous purification furnace as the set data;
[0030] If any ratio of the detection data to the set data exceeds a set threshold, the thermal insulation effect is judged to be unqualified; in some embodiments, the set threshold is 1.1-1.2.
[0031] In some embodiments, the detected water inlet temperature value, water outlet temperature value and water flow value are T b 、T a and F, the set water inlet temperature, water outlet temperature and water flow rate are T sb 、T sa and F s , detect the operation data (T a -T b )×F and set operation data (T sa -T sb )×F sIf the ratio exceeds the set threshold of 1.1-1.2, the thermal insulation effect is judged to be unqualified.
[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0033] In the present invention, references to “some embodiments”, “this embodiment”, examples, etc. describe a subset of all possible embodiments, but it can be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
[0034] If similar descriptions of "first / second" appear in the application documents, the following explanation is added. In the following description, the terms "first\second\third" are merely used to distinguish similar objects and do not represent a specific order for the objects. It is understandable that "first\second\third" can be interchanged with the specific order or sequence where permitted, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.
[0035] In this embodiment, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, object A and / or object B may represent three situations: object A exists alone, object A and object B exist at the same time, and object B exists alone.
[0036] Below, the embodiment of the present application is described. The embodiment described below is exemplary and is only used to explain the present application, and is not to be construed as limiting the present application. Where specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. Reagents or instruments used that do not specify the manufacturer are conventional products that can be obtained commercially.
[0037] Example 1
[0038] Combine Figure 1-3This embodiment proposes an online monitoring and evaluation system for the life of the insulation layer of a continuous purification furnace, including multiple groups of insulation layer temperature sensors 1, an analysis module TISA2, an inlet water temperature sensor 3, an outlet water temperature sensor 4 and a water flow sensor 5; the multiple groups of insulation layer temperature sensors 1 are arranged in different temperature zones in the direction of the furnace body; each group of insulation layer temperature sensors 1 includes multiple temperature sensors 111, and the multiple temperature sensors are distributed from the inner wall of the insulation layer 9 to the outer wall of the insulation layer 9; there are three groups of insulation layer temperature sensors 1, which are arranged in sequence In different temperature zones in the direction of the furnace body; the number of temperature sensors 111 in each group of insulation layer temperature sensors 1 is 8-10; the insulation layer temperature sensor 111 adopts a soft couple, which is fixed to the furnace shell 6 through a heat-resistant metal block, and the detection end of the insulation layer temperature sensor 1 contacts the insulation layer 9; the thermocouple of the insulation layer temperature sensor 1 passes through the furnace shell 6 and is sealed by the sealing component 7; the inlet water temperature sensor 3, the outlet water temperature sensor 4 and the water flow sensor 5 are respectively installed on the water inlet pipe 81 and the water outlet pipe 82 of the water cooling jacket;
[0039] The temperature sensor collects temperature data of the insulation layer 9, the water inlet temperature sensor 3 and the water outlet temperature sensor 4 respectively detect the water inlet temperature and the water outlet temperature of the water-cooled furnace shell 6, and the water flow sensor 5 detects the water flow of the water-cooled furnace shell 6. The above data are all transmitted to the analysis module TISA2; the analysis module TISA2 monitors and evaluates the insulation effect of the insulation layer 9 of the continuous purification furnace by comprehensively comparing the detected data with the set data.
[0040] On the basis of the above embodiment, the insulation layer temperature sensor 1 of this embodiment includes three groups of insulation layer temperature sensors A, B, and C; three groups of insulation layer temperature sensor groups are set in different temperature zones in the direction of the furnace body, which are grouped as temperature sensor A 11, temperature sensor B 12, and temperature sensor C 13. A temperature sensor 111 is inserted into each group every 10 mm, numbered 1 to 10, i.e. A1-A10, B1-B10, C1-C10, a total of 30 temperature sensors 111, of which the A1, B1, and C1 sensor probes are close to the inner wall of the insulation layer 9, and the maximum measurable temperature is 3000°C. The temperature data of the insulation layer 9 is collected and transmitted to the analysis module TISA2. The insulation effect of the insulation layer 9 is judged by comprehensively comparing the detection data with the set data, and an insulation effect evaluation is given. After the new equipment is installed and debugged, a test is carried out, and the temperature value of the initial test is used as the comparison data T SA1 ~T SA10 , T SB1 ~T SB10 , T SC1 ~T SC10 , during the normal operation of the equipment, the temperature measurement data T A1 ~T A10 ,T B1 ~T B10 ,TC1～TC10 Respectively compared with the corresponding data T SA1 ~T SA10 , T SB1 ~T SB10 , T SC1 ~T SC10 Contrast, ratio T A1 / T SA1 ~T A10 / T SA10 、T B1 / T SB1 ~T B10 / T SB10 、T C1 / T SC1 ~T C10 / T SC10 If any one of them exceeds 1.2, the insulation effect is judged to be unqualified and the equipment needs to be inspected and repaired. The inlet water temperature sensor 3 and the outlet water temperature sensor 4 respectively detect the inlet water temperature and outlet water temperature of the water-cooled furnace shell 6, and the water flow sensor 5 detects the water flow of the water-cooled furnace shell 6. The analysis module TISA2 calculates and compares the cooling water temperature and flow data to judge the insulation effect of the insulation layer 9 and give an insulation effect evaluation. After the new equipment is installed and debugged, it is tested and the temperature and flow values of the initial test are used as comparison data T sa (water outlet temperature), T sb (water inlet temperature), F s (water flow value), during the normal operation of the equipment, the temperature data outlet water temperature value T a , water inlet temperature value T b , water flow value F corresponds to the comparison data T sa 、T sb 、F s Compare and detect the operation data (T a -T b )×F and set operation data (T sa -T sb )×F s If the ratio exceeds the set threshold of 1.2, the insulation effect is judged to be unqualified and the equipment needs to be inspected and repaired for insulation.
[0041] The temperature sensors in this embodiment are 30 flexible thermocouples fixed to the furnace shell 6 by heat-resistant metal blocks, with the detection ends contacting the insulation layer 9. The thermocouples pass through the furnace shell 6 and are sealed by a sealing assembly 7 to prevent air leakage. The sealing assembly 7 includes a sealing seat 73, a rubber sealing block 72, a pressure block 74, etc. Specifically, in this embodiment, the sealing assembly 7 includes a tightening nut 71, a rubber sealing block 72, a sealing seat 73 and a pressure block 74; the sealing seat 73 is fixed at the mounting hole position of the furnace shell 6 to provide mounting support for the entire sealing assembly 7; the rubber sealing block 72 is sleeved on the thermocouple and located between the thermocouple and the sealing seat 73 to fill the gap and initially achieve a sealing effect; the pressure block 74 is sleeved on the outside of the thermocouple and located on the outside of the rubber sealing block 72. Through the threaded connection between the tightening nut 71 and the sealing seat 73, the pressure block 74, under the action of the tightening nut 71, tightly squeezes the rubber sealing block 72 between the sealing seat 73 and the thermocouple, causing the rubber sealing block 72 to deform, further enhancing the sealing performance, thereby achieving effective sealing at the thermocouple passing through the furnace shell 6.
[0042] This embodiment further includes an alarm (from the prior art, not shown in the figure but easy to understand), which is connected to the analysis module TISA2. If the thermal insulation effect is unsatisfactory, the alarm will sound an alarm.
[0043] The online monitoring and evaluation system for the insulation layer life of the continuous purification furnace of this embodiment can monitor the insulation effect of the insulation layer 9 online and automatically issue an alarm, providing a decision-making basis for production and equipment maintenance, and can avoid the occurrence of arching accidents caused by damage to the insulation layer 9 to a certain extent.
[0044] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.
Claims
1. An online monitoring and evaluation system for the insulation layer of a continuous purification furnace, characterized in that: It includes multiple groups of insulation layer temperature sensors, an analysis module TISA, an inlet water temperature sensor, an outlet water temperature sensor and a water flow sensor; multiple groups of the insulation layer temperature sensors are arranged in different temperature zones in the direction of the furnace body; the insulation layer temperature sensors collect temperature data of the insulation layer, the inlet water temperature sensor and the outlet water temperature sensor respectively detect the inlet water temperature and the outlet water temperature of the water-cooled furnace shell, and the water flow sensor detects the water flow of the water-cooled furnace shell. The above data are all transmitted to the analysis module TISA; the analysis module TISA comprehensively compares the detection data with the set data to monitor and evaluate the insulation effect of the insulation layer of the continuous purification furnace.
2. The online monitoring and evaluation system for the insulation layer of a continuous purification furnace according to claim 1 is characterized in that: The water inlet temperature sensor, the water outlet temperature sensor and the water flow sensor are respectively installed on the water inlet pipe and the water outlet pipe of the water cooling jacket; and / or, each group of the insulation layer temperature sensors includes multiple temperature sensors, and the multiple temperature sensors are gradually distributed from close to the inner wall of the insulation layer to close to the outer wall of the insulation layer.
3. The online monitoring and evaluation system for the insulation layer of a continuous purification furnace according to claim 2, characterized in that: There are three groups of insulation layer temperature sensors in total, which are sequentially arranged in different temperature zones in the direction of the furnace body; the number of temperature sensors in each group of insulation layer temperature sensors is 8-10.
4. The online monitoring and evaluation system for the insulation layer of a continuous purification furnace according to claim 1 is characterized in that: The insulation layer temperature sensor is fixed on the furnace shell, and the detection end of the insulation layer temperature sensor contacts the insulation layer; the thermocouple of the insulation layer temperature sensor passes through the furnace shell and is sealed by a sealing component.
5. The online monitoring and evaluation system for the insulation layer of a continuous purification furnace according to claim 4 is characterized in that: The insulation layer temperature sensor is fixed on the furnace shell through a heat-resistant metal block.
6. The online monitoring and evaluation system for the insulation layer of a continuous purification furnace according to claim 4, characterized in that: The sealing assembly includes a clamping nut, a deformable sealing block, a sealing seat and a pressure block; the sealing seat is fixed at the mounting hole position of the furnace shell to provide mounting support for the entire sealing assembly; the deformable sealing block is sleeved on the thermocouple and located between the thermocouple and the sealing seat to fill the gap and initially achieve a sealing effect; the pressure block is sleeved on the outside of the thermocouple and located on the outside of the deformable sealing block. It is threadedly connected to the sealing seat through the clamping nut. Under the action of the clamping nut, the pressure block tightly squeezes the deformable sealing block between the sealing seat and the thermocouple, causing the deformable sealing block to deform, thereby further enhancing the sealing performance.
7. The online monitoring and evaluation system for the insulation layer of a continuous purification furnace according to claim 6, characterized in that: The deformable sealing block is a rubber sealing block.
8. The monitoring and evaluation method of the online monitoring and evaluation system for the insulation layer of the continuous purification furnace according to any one of claims 1 to 7, characterized in that: include: The temperature value and water flow rate value of the new continuous purification furnace after debugging are used as the setting data; If any ratio of the detection data to the set data exceeds the set threshold, it is judged that the thermal insulation effect is unqualified.
9. The monitoring and evaluation method according to claim 8, characterized in that: The set threshold is 1.1-1.
2.
10. The monitoring and evaluation method according to claim 8, characterized in that: The detected water inlet temperature, water outlet temperature and water flow rate are T b 、T a and F, the set water inlet temperature, water outlet temperature and water flow rate are T sb 、T sa and F s , detect the operation data (T a -T b )×F and set operation data (T sa -T sb )×F s If the ratio exceeds the set threshold of 1.1-1.2, the thermal insulation effect is judged to be unqualified.