Drying device and drying method for heat preservation pipeline pipe fitting

Abstract

The drying device comprises a heat preservation sleeve used for wrapping the pipeline and the pipe fitting, the heat preservation sleeve comprises a heat preservation layer and a film layer, the heat preservation layer is used for being attached to the pipeline and the pipe fitting, and the film layer is located on the outer side of the heat preservation layer; a first circulation hole is formed in the heat preservation sleeve, a drainage pipe is arranged on the first circulation hole, and a one-way valve is arranged on the drainage pipe; a second circulation hole is further formed in the heat preservation sleeve, an air supply pipe is arranged on the second circulation hole, and the air supply pipe is used for supplying air into the heat preservation layer or sucking air into the heat preservation layer; a monitoring device is further arranged on the heat preservation sleeve and comprises a probe, one end of the probe extends into the heat preservation layer, the other end of the probe extends out of the film layer, and the probe is used for monitoring resistance. The thermal insulation sleeve has the beneficial effects that the thermal insulation sleeve guarantees the thermal insulation effect of the pipeline pipe fitting, the monitoring device is arranged, the resistance in the thermal insulation layer is compared with a set resistance value, when the deviation rate reaches a target value, air is supplied into the thermal insulation sleeve through the second circulation hole by the air supply pipe, and accumulated water is discharged from the first circulation hole.

Description

Technical Field

[0001] The invention relates to an industrial product, and more particularly to a pipeline heat-insulating and leak-proof drying device and a method thereof. Background Art

[0002] In industrial production, there is often a lack of insulation, leak-proof and drying measures for pipelines. Liquid water and water vapor attached to the inside or outside of pipelines are extremely harmful, and drying treatment is required to ensure their long-term, safe and stable operation. The prior art has an invention titled: an oil and gas pipeline induced drying pig, with a Chinese invention patent application number of CN201911317348.2. The invention uses a pig barrel, an air intake control valve installed in the middle of the pig barrel, a supporting leather cup fixed on the side wall of the pig barrel, a Laval nozzle connected to the internal thread of the pig barrel, and a Venturi tube connected to the external thread of the pig barrel. Compared with traditional technology, the invention has no moving components inside and a simple structure. Through the invention, pipeline drying can be achieved by moving in the pipeline, which improves the drying operation efficiency. However, in the case of many pipelines, step-by-step installation is very cumbersome, and it cannot be applied to tanks and flanges. When encountering pipelines with special structures, the equipment often needs to be customized again, which leads to high cost when the equipment is applied and cannot cope with complex usage scenarios. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide a drying device for heat-insulating pipeline fittings.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a drying device for heat-insulating pipelines and pipe fittings, comprising a heat-insulating sleeve for covering the pipelines and pipe fittings, the heat-insulating sleeve comprising a heat-insulating layer and a film layer, the heat-insulating layer is used to fit the pipelines and pipe fittings, and the film layer is located outside the foaming layer; The insulation sleeve is provided with a first flow hole, the first flow hole is provided with a drain pipe, and the drain pipe is provided with a control valve; the control valve is a one-way valve or a solenoid valve; The insulation sleeve is also provided with a second flow hole, and the second flow hole is provided with an air supply pipe, and the air supply pipe is used to supply or inhale air into the insulation layer; the insulation sleeve is also provided with a monitoring device, and the detection device includes a probe rod, and the probe rod penetrates into the insulation layer, and one end extends out of the membrane layer, and the probe rod is used to detect resistance.

[0005] As a further improvement of the present invention, the heat preservation sleeve has a mounting plate, on which there are a detection hole and a mounting hole. The mounting hole communicates with the second flow hole. The monitoring device is installed on the mounting plate. The detection rod extends into the heat preservation sleeve through the detection hole. One end of the air supply pipe is installed in the mounting hole, and the other end of the air supply pipe has a cover. The air supply pipe is used to connect to an air pump.

[0006] As a further improvement of the present invention, the detection rod is L-shaped. One section of the L-shaped detection rod is arranged in the heat preservation sleeve, and the other section of the L-shaped detection rod extends out of the mounting plate through the detection hole.

[0007] As a further improvement of the present invention, there are also contact blocks in the heat preservation layer. One end of each contact block contacts the detection rod, and the other end contacts the pipeline fitting. There are two contact blocks.

[0008] As a further improvement of the present invention, the first flow hole is arranged at the bottom of the heat preservation sleeve and is arranged along the direction of gravity. The drain pipe is vertically installed in the first flow hole.

[0009] As a further improvement, there are several collection openings on the drain pipe, and several partition grooves are arranged on the drain pipe.

[0010] As a further improvement, there is also a collector, and the collector is connected to the drain pipe.

[0011] As a further improvement of the present invention, the heat preservation layer is made of a foaming material, and the film layer is made of aluminum foil paper.

[0012] As a further improvement of the present invention, there is a color developer in the collector.

[0013] As a further improvement of the present invention, a sealing cover is arranged on the heat preservation sleeve.

[0014] Another object of the present invention is to provide a drying method for heat-preserving pipeline fittings: (A) Measure the initial resistance value R1 and measure the resistance value R2 of the detection rod; (B) Perform resistance comparison to calculate the deviation rate: A = (|R2 - R1|) / R1; (C) Set the deviation rates X1 and X2; (D) When X1 < A ≤ X2, send air into the heat preservation layer through the air pump to the air supply pipe and the second flow hole; the air pump keeps sending air for T minutes.

[0015] As a further improvement of the present invention, when A > X2, blow the rust inhibitor into the heat preservation layer through the air pump via the air supply pipe and the second flow hole.

[0016] The beneficial effects of the present invention are as follows: an insulation sleeve is coated on the outer layer of the pipe fittings and pipelines to ensure the insulation effect of the pipe fittings and pipelines, and a first flow hole is opened in the insulation sleeve to ensure that internal impurity water droplets are discharged from the first flow hole when water accumulates in the insulation sleeve, and a drain pipe is arranged at the first flow hole to facilitate the discharge of water, and a control valve is arranged on the drain pipe to prevent the water from returning to the insulation sleeve after being discharged, and a second flow hole is arranged, and the second flow hole is connected to an air supply pipe, when there is water in the insulation sleeve, the air supply pipe supplies or inhales air into the insulation layer to help keep the inside of the insulation layer dry; a monitoring device is also arranged at the same time, and one end of the probe in the detection device penetrates into the insulation layer and the other end extends out of the membrane layer, and when the probe detects the resistance in the insulation layer, the detection device compares it with the set resistance value, and when the deviation rate reaches the target value, the air supply pipe supplies air to the insulation sleeve through the second flow hole and discharges water from the first flow hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a drying device for heat-insulated pipeline fittings of Embodiment 1; Figure 2 It is an exploded schematic diagram of a drying device for heat-insulated pipeline fittings of the first embodiment; Figure 3 Schematic diagram of the collector and probe of Example 1; Figure 4 It is a schematic diagram of the thermal insulation cover of the first embodiment; Figure 5 It is an enlarged schematic diagram of the drainage pipe of the first embodiment; Figure 6 This is a schematic diagram of the position of the sealing cover of the first embodiment; Figure 7 It is a structural diagram of embodiment 2.

[0018] 1. Insulation sleeve; 2. Insulation layer; 3. Membrane layer; 4. First flow hole; 5. Drain pipe; 6. One-way valve; 7. Second flow hole; 8. Air supply pipe; 9. Monitoring device; 10. Probe; 11. Mounting plate; 12. Sealing cover; 13. Contact block; 14. Collecting opening; 15. Collector; 16. Probe hole; 17. Mounting hole; 18. Partition groove; 19. Sealing cover; 61. Solenoid valve. DETAILED DESCRIPTION

[0019] The present invention will be further described below in detail with reference to the embodiments shown in the accompanying drawings. Embodiment 1:

[0020] Reference Figure 1-6 The schematic diagram of the insulation sleeve 1 wrapping a section of the pipeline, and the reference Figure 6Schematic diagram of the position of the sealing cover; a drying device for insulated pipelines and pipe fittings according to the present embodiment comprises an insulation sleeve 1 for covering the pipelines and pipe fittings, the insulation sleeve 1 comprises an insulation layer 2 and a film layer 3, the insulation layer 2 is used to fit the pipelines and pipe fittings, and the film layer 3 is located on the outside of the insulation layer 2; a first flow hole 4 is provided on the insulation sleeve 1, a drain pipe 5 is provided on the first flow hole 4, and a one-way valve 6 is provided on the drain pipe 5; a second flow hole 7 is also provided on the insulation sleeve 1, an air supply pipe 8 is provided on the second flow hole 7, and the air supply pipe 8 is used to supply or inhale air into the insulation layer 2; a monitoring device 9 is also provided on the insulation sleeve 1, and the detection device comprises a probe 10, one end of the probe 10 penetrates into the insulation layer 2, and the other end extends out of the film layer 3, and the probe 10 is used to detect resistance.

[0021] Through the above technical solution, the pipelines and pipes that need to be insulated and dried are wrapped with the insulation sleeve 1, and the pipelines and pipes in this implementation scheme include: pipes, pipe fittings, flanges, tanks, etc. If water vapor is generated in the insulation sleeve 1, the probe 10 is corroded or liquid is attached, causing the monitoring device 9 to detect a change in resistance, and the monitoring device 9 sends an alarm or a signal to connect the air pump to blow it up. The air pump is a prior art and can be directly connected to the air supply pipe 8. This embodiment will not be explained in detail. At this time, the air supply pipe 8 on the second flow hole 7 is directed to the insulation sleeve 1. Air is supplied into the thermal insulation sleeve 1 to increase the fluidity of the gas in the thermal insulation sleeve 1, driving the liquid and gas in the sleeve to converge to the first flow hole 4, and the first flow hole 4 is provided with a drain pipe 5, and the converged liquid and gas are discharged from the drain pipe 5, and the drain pipe 5 is provided with a one-way valve 6, which prevents the gas and liquid from flowing back to the second flow hole 7 after the discharge is completed. The monitoring device 9 uses an online corrosion device, and the probe 10 uses an ER probe 3800. The specific structure and working principle of the online corrosion device and the ER probe 3800 are both existing technologies, and therefore will not be described in detail in this manual.

[0022] Furthermore, as a further preference, the material of the probe can be selected to be the same as that of the pipeline fittings, so that the corrosion condition inside the pipeline fittings can be detected in the best way.

[0023] As an improved specific embodiment, the insulation sleeve 1 has a mounting plate 11, the mounting plate 11 has a probe hole 16 and a mounting hole 17, the mounting hole 17 is connected to the second flow hole 7, the monitoring device 9 is installed on the mounting plate 11, the probe 10 extends into the insulation sleeve 1 through the probe hole 16, one end of the air supply pipe 8 is installed in the mounting hole 17, the other end of the air supply pipe 8 has a sealing cover 12, and the air supply pipe 8 is used to connect an air pump.

[0024] Through the above technical solution, a mounting plate 11 is arranged outside the insulation sleeve 1, which is convenient for installing the monitoring device 9 on the outside of the insulation sleeve 1, and the air supply pipe 8 is also connected to the insulation sleeve 1 through the mounting plate 11, which is convenient for installation. After the monitoring device 9 and the air supply pipe 8 are uniformly mounted on the mounting plate 11, the insulation sleeve 1 is more concise when it is set outside, and the operation or observation is uniformly performed on the mounting plate 11. The other end of the air supply pipe 8 is connected to an air pump, and the air pump is used to make the air flow pass through the air supply pipe 8, and then the air is supplied to the inside of the insulation sleeve 1 through the second flow hole 7. When the air pressure in the insulation sleeve 1 increases, the air flow will drive the moisture in the sleeve to The air is discharged through the first flow hole 4, thereby achieving the actual effect of drying the inside of the sleeve; the heat preservation sleeve 1 is used to wrap the pipeline to form a relatively isolated temperature and humidity inside the sleeve, and the mounting plate 11 is used to facilitate the installation of various devices outside the heat preservation sleeve 1, so that during installation, only the monitoring device 9, the air supply pipe 8 and other equipment need to be installed on the mounting plate 11, which is convenient for the unified management of the equipment, and the air supply pipe 8 is connected to the air pump, and the air pump generally has the function of blowing and sucking air. The structure and working principle of the equipment are all existing technologies, so they are no longer described in detail in this manual; and an air pump is set to be able to connect multiple air supply pipes 8, through A single air pump can be set up to perform air supply operations on multiple air supply pipes 8, thereby operating the drying devices of multiple insulation pipelines and pipe fittings, thereby reducing equipment costs; the metal surface on the pipeline will form an oxide layer after reacting with the air and moisture in the insulation sleeve 1, which will significantly affect the resistance. Rust will cause the pipeline surface to become rough and irregular, reducing the effective conductive area, thereby increasing the difficulty of current passing and increasing the resistance value. In addition, the oxide produced by rust itself often has poor conductivity, further exacerbating the increase in resistance; and when the monitoring device detects that the resistance in the insulation sleeve 1 reaches a certain change, it is said It is clear that there are water droplets or rust in the insulation sleeve 1, and the staff observes the monitoring results. At this time, the staff opens the cover 8 according to the monitoring results to ensure that the air supply pipe 8 is connected to the air pump unobstructed, and then turns on the air pump to supply or inhale air into the sleeve; and the online corrosion device can also send a signal to the air pump, and the air pump starts to supply or inhale air according to the received signal, and completes the drying work in the insulation sleeve 1 by opening the cover 8 in advance. When the air pump is not used, the cover 12 seals the air supply pipe 8 to isolate the external gas from interacting with the gas in the insulation sleeve 1, and maintains the dryness and temperature in the insulation sleeve. The setting of the cover 12 can close the air supply pipe during normal use and open it when air supply is needed.

[0025] As an improved specific implementation, the probe 10 is L-shaped, one section of the probe 10L is disposed in the thermal insulation sleeve 1 , and the other section of the probe 10L extends out of the mounting plate 11 through the probe hole 16 .

[0026] Through the above technical solution, when the probe 10 is L-shaped, one section of the L-shape is longer inside the insulation sleeve 1, which is easy to contact with the inner wall of the insulation sleeve 1 or the pipeline fittings and has a larger range, while the other section of the L-shaped probe 10 extends out of the mounting plate 11 through the exploration hole 16, so that the staff can monitor by observing the mounting plate. Therefore, the detection range is larger than that of the ordinary probe 10, and the detection result is more accurate.

[0027] As an improved specific implementation, the thermal insulation layer 2 further comprises a contact block 13, one end of the contact block 13 contacts the probe 10, and the other end contacts the pipeline fitting, and the contact block 13 comprises two pieces.

[0028] Through the above technical solution, two contact blocks 13 are set on the pipeline fittings, so that the two ends of one section of the L-shaped probe 10 are connected to the contact blocks 13. At this time, the contact of the probe 10 with the pipeline fittings is more stable, and at this time, the material of the contact block 13, the pipeline fittings and the L-shaped probe 10 are set to be consistent, so as to ensure that when the probe 10 monitors the resistance, due to the contact with the contact block 13 on the pipeline fittings, the probe 10 detects the resistance of the pipeline fittings and the inner wall of the insulation sleeve 1 at the same time, so that the monitoring range is wider and the monitoring is more accurate.

[0029] As an improved specific implementation, the first circulation hole 4 is arranged at the bottom of the insulation sleeve 1 and arranged along the gravity direction, and the drainage pipe 5 is vertically installed in the first circulation hole 4.

[0030] Through the above technical solution, water droplets in the insulation sleeve 1 are more likely to gather at the bottom of the insulation sleeve 1, and when the first circulation hole 4 is set at the bottom of the insulation sleeve 1, the liquid in the sleeve is more likely to gather at the first circulation hole 4, and pass through the drain pipe 5 when discharged. At this time, the drain pipe 5 is set vertically. At this time, the vertical drain pipe 5 is easier to discharge the liquid, which reduces the water droplets retained in the drain pipe 5, making it convenient to keep the insulation sleeve 1 dry.

[0031] As an improved specific implementation, the drain pipe 5 has a plurality of collecting openings 14 , and the drain pipe 5 is provided with a plurality of dividing grooves 18 .

[0032] Through the above technical scheme, a plurality of collecting openings 14 are provided, and each collecting opening 14 collects water droplets gathered in all directions, which can further facilitate the collection of water droplets in the insulation sleeve 1 and keep the insulation sleeve 1 dry; when it is necessary to break off the excess length of the drain pipe 5, the notch of the dividing groove 18 is thinner than the thickness of the drain pipe 5, and it is easier to break the drain pipe 5 along the dividing groove 18, thereby shortening the length of the drain pipe 5, and breaking off the excess section of the drain pipe 5 according to the different thickness of the insulation sleeve 1, so that the length of the drain pipe 5 matches the thickness of the insulation sleeve 1, adapts to various situations, and achieves the purpose of convenient use.

[0033] As an improved specific implementation, a collector 15 is further provided, and the collector 15 is connected to the drain pipe 5 .

[0034] Through the above technical solution, when the drain pipe 5 discharges water, the collector 15 connected to the drain pipe 5 collects the water, and the collector 15 adopts a transparent plastic test tube, which further facilitates the observation of leakage while draining water.

[0035] As an improved specific implementation, the thermal insulation layer 2 is made of foam material, and the film layer 3 is made of aluminum foil.

[0036] Through the above technical scheme, the insulation layer 2 is made of foamed material such as polyurethane foam, which has excellent thermal insulation, lightness and elasticity; and the membrane layer 3 is made of aluminum foil. These materials have good thermal insulation effect, strong plasticity, and are simple and easy to obtain, which can effectively reduce costs.

[0037] As an improved specific implementation, the collector contains a color developer.

[0038] Through the above technical solution, a color developer is set in the collector 15, and the color developer generally adopts a rust indicator to test ferrous ions. When the material is collected in the collector, if there is rust, there are ferrous ions in the collector; the rust indicator contains potassium ferrocyanide, and potassium ferrocyanide reacts with the ferrous ions in the rust to generate blue ferric ferrocyanide, which is convenient for maintenance personnel to observe and perform maintenance in time.

[0039] As for the sealing of both ends of the thermal insulation sleeve, the existing technology is very mature, such as sealing by flange abutment, covering with a film layer, and sealing with a sealing cover. This embodiment provides a solution of using a sealing cover.

[0040] As an improved specific implementation, a sealing cover 19 is provided on the thermal insulation sleeve 1.

[0041] Through the above technical solution, in the attached Figure 1-4 The figure only shows a schematic diagram of a section of the pipe wrapped by the insulation sleeve 1. Figure 6 It is a schematic diagram of the sealing cover 19 sealing the insulation sleeve 1. When the insulation sleeve 1 is generally used to wrap the pipe, the sealing covers 19 are covered on both ends of the insulation sleeve 1 to ensure the sealing of the insulation sleeve 1 and further ensure the temperature and dryness. When wrapping the tank body, only one end needs to be added with the sealing cover 19 to ensure the seal.

[0042] Reference Figure 1-6As shown in the figure, another object of this embodiment is a drying method for heat-insulating pipeline fittings: (A) Measure the initial resistance value R1 and measure the resistance value R2 of the probe 10; (B) Perform resistance value comparison and calculate the deviation rate: A = (|R2 - R1|) / R1; (C) Set the deviation rates X1 and X2; (D) When X1 < A ≤ X2, send air into the heat-insulating layer 2 through the air pump to the air supply pipe 8 and the second flow hole 7; the air pump keeps sending air for T min.

[0043] Through the above technical solution, an initial resistance value R1 is set, and the resistance value R2 inside the heat-insulating sleeve 1 is detected using the probe 10. When there is water or rust in the heat-insulating sleeve 1 due to the probe 10, there will be a deviation between the detected resistance value R2 and the initial resistance value R1. At this time, the resistance value R2 detected by the probe 10 is compared with the initially measured resistance value R1 and the deviation rate is calculated. When the deviation rate is less than or equal to X1, it means that there is no rust or moisture, or it is thin, and no operation is performed. When the deviation rate exceeds X1 and is less than or equal to X2, it means that rust has occurred or there are more water droplets inside the heat-insulating sleeve 1. At this time, the staff observes this deviation rate and manually turns on the air pump to make the air flow through the air supply pipe 8 and the second flow hole 7 into the heat-insulating layer 2 for a sending air time of T min to ensure the dryness inside the heat-insulating layer 2; or when the deviation rate exceeds X1 and is less than or equal to X2, the pre-corrosion device sends a signal to the air pump, and the air pump starts sending air according to the received signal to keep the inside of the heat-insulating sleeve 1 dry.

[0044] As a specific improved embodiment, when A > X2, the rust inhibitor is blown into the heat-insulating layer 2 through the air pump via the air supply pipe 8 and the second flow hole 7.

[0045] Through the above technical solution, when the deviation rate exceeds X2, it means that the rust inside the heat-insulating sleeve 1 is relatively large. While the air pump blows air inside, the rust inhibitor is further input inside to further ensure the dryness of the pipeline fittings. Embodiment Two:

[0046] Refer to Figure 7 , on the basis of Embodiment One, replace the one-way valve with a solenoid valve 61, which can be linked with the air pump. When the air pump starts, the solenoid valve 61 opens, and when the air pump closes, the solenoid valve 61 closes.

[0047] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A drying device for heat-insulating pipeline fittings, characterized in that: It includes a heat-insulating sleeve (1) for covering the pipeline fittings. The heat-insulating sleeve (1) includes a heat-insulating layer (2) and a film layer (3). The heat-insulating layer (2) is used to fit the pipeline fittings, and the film layer (3) is located outside the heat-insulating layer (2); A first through hole (4) is provided on the heat-insulating sleeve (1), a drain pipe (5) is provided on the first through hole (4), and a control valve is provided on the drain pipe (5); the control valve is a one-way valve (6) or a solenoid valve (61); A second through hole (7) is further provided on the heat-insulating sleeve (1), a gas supply pipe (8) is provided on the second through hole (7), and the gas supply pipe (8) is used to supply or suck air into the heat-insulating layer (2); A monitoring device (9) is further provided on the heat-insulating sleeve (1). The monitoring device (9) includes a probe (10). One end of the probe (10) extends deep into the heat-insulating layer (2), and one end extends out of the film layer (3). The probe (10) is used to monitor the resistance.

2. The drying device for heat-insulating pipelines and pipe fittings according to claim 1, characterized in that: The heat-insulating sleeve (1) has a mounting plate (11). The mounting plate (11) has a probe hole (16) and a mounting hole (17). The mounting hole (17) is communicated with the second through hole (7). The monitoring device (9) is mounted on the mounting plate (11). The probe (10) extends into the heat-insulating sleeve (1) through the probe hole (16). One end of the gas supply pipe (8) is mounted on the mounting hole (17), and the other end of the gas supply pipe (8) has a cap (12). The gas supply pipe (8) is used to connect to an air pump.

3. The drying device for heat-insulated pipeline fittings according to claim 2, characterized in that: The probe (10) is L-shaped. One L-shaped section of the probe (10) is arranged inside the heat-insulating sleeve (1), and the other L-shaped section of the probe (10) extends out of the mounting plate (11) through the probe hole (16).

4. The drying device for heat-insulated pipelines and pipes according to claim 3, characterized in that: There is also a contact block (13) inside the heat-insulating layer (2). One end of the contact block (13) contacts the probe (10), and the other end contacts the pipeline fitting. There are two contact blocks (13).

5. The drying device for heat-insulated pipelines and pipes according to claim 4, characterized in that: The first through hole (4) is provided at the bottom of the heat-insulating sleeve (1) and is arranged along the direction of gravity. The drain pipe (5) is vertically inserted into the first through hole (4).

6. The drying device for heat-insulated pipelines and pipes according to claim 5, characterized in that: The drain pipe (5) has a number of collection openings (14), and a number of partition grooves (18) are provided on the drain pipe (5).

7. The drying device for heat-insulated pipelines and pipes according to claim 6, characterized in that: There is also a collector (15), and the collector (15) is connected to the drain pipe (5).

8. The drying device for heat-insulated pipelines and pipes according to claim 7, characterized in that: The heat-insulating layer (2) is made of a foaming material, and the film layer (3) is made of aluminum foil paper.

9. The drying method of the drying device for heat-insulating pipeline fittings according to any one of claims 1-7, characterized in that: (A) Measure the initial resistance value R1 and measure the resistance value R2 of the probe (10); (B) Perform resistance value comparison and calculate the deviation rate: A = (|R2 - R1|) / R1; (C) Set the deviation rates X1 and X2; (D) When X1 < A ≤ X2, send air into the heat-insulating layer (2) through the air pump to the gas supply pipe (8) and the second through hole (7); the air pump keeps sending air for T min.

10. The drying method according to claim 9, characterized in that: When A>X2, the rust inhibitor is blown into the thermal insulation layer (2) through the air supply pipe (8) and the second flow hole (7) by an air pump.

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