Flexible constant-temperature sleeve and constant-temperature system

Abstract

The invention provides a flexible constant-temperature sleeve and a constant-temperature system.The constant-temperature system comprises the flexible constant-temperature sleeve and an electric heating device supplying power to the flexible constant-temperature sleeve, the flexible constant-temperature sleeve comprises a constant-temperature part and a connecting part located on the periphery of the constant-temperature part, and the constant-temperature part comprises a waterproof flame-retardant layer, a heat preservation layer and a heating layer which are sequentially arranged in a stacked mode; the fixing part is arranged around the edge of the constant-temperature part, the constant-temperature part formed by the waterproof flame-retardant layer, the heat preservation layer and the heating layer is fixed into a whole, the connecting part is connected with the constant-temperature part through the fixing part, the heating layer comprises a fixing unit and a resistance wire, and the fixing unit is formed by needling two layers of polyester non-woven fabric. A channel for the resistance wire to penetrate through is formed in the non-needling part, the resistance wire is fixed through the channel, the heat preservation layer and the fixing unit are also subjected to flame retardant treatment, and the two ends of the resistance wire are connected with the electric heating device. According to the scheme, the structure of the flexible constant-temperature sleeve is simplified, the flexible constant-temperature sleeve is not prone to spontaneous combustion at high temperature, and the use safety is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of constant temperature equipment, and in particular relates to a flexible constant temperature sleeve and a constant temperature system. Background Art

[0002] In some industrial fields, in order to ensure that the outer surfaces of some equipment or containers in industrial production are used during transportation or under extremely cold temperature conditions, it is necessary to control the temperature of these objects within a certain range and ensure safety for outdoor use.

[0003] In the prior art, heating insulation blankets are basically used to insulate equipment. These insulation blankets have certain warmth retention properties, but are not waterproof, are easy to burn, cannot prevent static electricity, and have poor temperature control accuracy. When the heating blanket generates high temperature and acts on the surface of a container or object, such as a high-pressure gas cylinder, safety hazards are likely to occur.

[0004] To this end, the Chinese invention patent with application number CN202210461926.5 discloses a flexible constant temperature sleeve, including a thermal insulation layer, a heat conductive layer and a heating plate. While the heat conductive layer realizes sufficient heat transfer, it avoids the defect that the constant temperature sleeve does not have flame retardant and heat insulation function; although the temperature is maintained and it is convenient for users to use it through the thermal insulation layer, the above-mentioned flexible constant temperature sleeve still has the risk of spontaneous combustion due to its own high temperature, which is not conducive to the long-term use of industrial equipment.

[0005] To this end, the Chinese utility model patent with application number CN201821430602.0 discloses a flexible waterproof graphene quick-heating film, and specifically discloses that it includes a PU waterproof anti-aging layer, a graphene heating film, a DC conductive electrode layer, an insulating flame retardant layer, a silver-coated antistatic layer and a reflective insulation layer stacked in sequence. Although it greatly improves the safety performance, its structure is complex and the production cost is high, which is not conducive to industrial application.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a flexible constant temperature sleeve in view of the problems in the above-mentioned prior art, comprising a constant temperature part and a connecting part, wherein the constant temperature part comprises a heating layer and a thermal insulation layer which are stacked, and the resistance wire of the heating layer is fixed on a fixing unit made of polyester nonwoven fabric. The polyester nonwoven fabric has been subjected to heat insulation treatment, and the fabric can fix the heating unit while avoiding its own temperature being too high, while meeting the heat transfer requirements, and has a simple structure and is convenient for industrial use.

[0008] Another object of the present invention is to provide a constant temperature system, which is heated by an electric heating device and a resistance wire, and the temperature is adjusted in time through feedback from a temperature sensor, thereby ensuring the temperature control accuracy and sensitivity of the constant temperature system.

[0009] In order to achieve the above-mentioned object, the first aspect of the present invention provides a flexible thermostatic sleeve, comprising a thermostatic portion and a connecting portion located around the thermostatic portion, wherein the thermostatic portion comprises a heating layer and a heat preservation layer stacked in sequence, wherein the heating layer comprises:

[0010] Resistance wire,

[0011] A fixing unit includes two layers of polyester nonwoven fabrics, wherein the two layers of polyester nonwoven fabrics are stacked and connected by needle punching;

[0012] The non-needle-punched parts of the two layers of polyester nonwoven fabric form a channel for fixing the resistance wire, and the resistance wire is fixed on the fixing unit.

[0013] In the above scheme, the fixing unit includes two layers of needle-punched polyester nonwoven fabrics, which sandwich the resistance wire in the middle, thereby avoiding the danger of the resistance wire directly contacting the equipment to be insulated; and a channel for fixing the resistance wire is formed by needle punching, and there is no need to set up a separate fixing device for fixing the resistance wire, thereby simplifying the structure of the flexible constant temperature sleeve.

[0014] Furthermore, the polyester nonwoven fabric is a mesh fabric made of added flame-retardant polyester staple fibers through combing and needle-punching. Due to its flame-retardant properties, it can prevent the resistance wire from overheating and causing the fixed unit to catch fire, thereby improving the safety of the flexible constant temperature sleeve. The mesh structure of the fabric can also ensure that the heat generated by the resistance wire is smoothly transferred to the outside, thereby achieving thermal insulation of industrial equipment.

[0015] Furthermore, the non-needle-punched parts of the two layers of polyester nonwoven fabric form a corrugated channel, and openings for the resistance wire to pass in and out are formed on opposite sides of the fixing unit.

[0016] In the above scheme, the corrugated channel formed by acupuncture ensures that the resistance wire has a larger coverage area, improves the heating and temperature control capabilities of the resistance wire, and improves the temperature consistency of various parts of the flexible constant temperature sleeve; and the reciprocating bending arrangement of the resistance wire in the corrugated channel has better stability and is not easy to fall off during use, thereby improving the safety and stability of the flexible constant temperature sleeve.

[0017] Furthermore, the constant temperature part also includes an antistatic layer, and the antistatic layer is stacked with the heating layer and the thermal insulation layer.

[0018] Furthermore, the antistatic layer is antistatic polyester imitation silk obtained by interweaving conductive yarns and polyester yarns.

[0019] In the above scheme, the antistatic polyester imitation silk made by interweaving conductive yarn and polyester yarn has the characteristics of small thickness and high flexibility, which can meet the deformation requirements of the flexible constant temperature sleeve and provide excellent antistatic ability.

[0020] Preferably, the polyester yarn is flame-retardantly treated and then interwoven with the conductive yarn to obtain the antistatic polyester imitation silk.

[0021] In the above preferred embodiment, the flame-retardant treated polyester yarn can further provide flame-retardant capability to the antistatic layer, thereby further improving the safety of the flexible constant temperature sleeve.

[0022] Furthermore, the thermal insulation layer is made of down material that has been treated with flame retardancy.

[0023] Furthermore, the constant temperature part also includes a waterproof and flame-retardant layer, and the waterproof and flame-retardant layer is located on the other side of the insulation layer opposite to the heating layer.

[0024] When in use, the waterproof and flame-retardant layer is located at the outermost layer of the flexible thermostatic sleeve, which can prevent external water from entering the flexible thermostatic sleeve. The waterproof and flame-retardant layer also has excellent flame-retardant properties. On the one hand, it prevents the spread of internal fire, and on the other hand, it can also avoid the impact of external fire. To a certain extent, the flexible thermostatic sleeve can be used as a fireproof layer to protect industrial equipment.

[0025] Furthermore, the flexible constant temperature sleeve also includes:

[0026] A fixing part, arranged around the edge of the constant temperature part, and fixing the constant temperature part through the fixing part;

[0027] The connecting part is connected to the constant temperature part through a fixing part.

[0028] In the above scheme, the fixing part fixes the thermostatic part of the stacked structure from the edge of the thermostatic part, which improves the compactness and stability of the thermostatic part structure. The connection is not connected to the thermostatic part through the fixing part, which reduces the connection difficulty. At the same time, the modular design of the flexible thermostatic sleeve is realized, and damaged parts can be replaced in a targeted manner, thereby improving the user experience.

[0029] Furthermore, in order to ensure the flame retardant effect and working stability of the flexible constant temperature sleeve, the fixing part and the connecting part are also made of flame retardant treated materials; the fixing part can be made of flame retardant polyester cloth, the flame retardant polyester cloth wraps the edge of the constant temperature part, and the constant temperature part is fixed by sewing; the connecting part can also be made of flame retardant polyester cloth, sewn on the fixed part, or the fixed part is integrally arranged.

[0030] Furthermore, in order to improve the ease of use of the flexible thermostatic sleeve, the connecting parts are at least arranged on two opposite sides of the flexible thermostatic sleeve, and multiple flexible thermostatic sleeves can be connected to each other through the connecting parts, thereby meeting the use requirements of industrial equipment of different sizes and realizing the combined use of multiple flexible thermostatic sleeves.

[0031] The present invention also provides a constant temperature system having the above-mentioned flexible constant temperature sleeve, which is specifically as follows.

[0032] The constant temperature system includes a flexible constant temperature sleeve and an electric heating device. The electric heating device is respectively connected to two ends of the resistance wire to form a power supply circuit, and supplies power to the resistance wire.

[0033] Furthermore, the constant temperature system also includes a temperature sensor, which is fixed on the fixed unit of the flexible constant temperature sleeve and is communicated with the electric heating device for detecting the temperature of the heating layer. The electric heating device can then adjust the power supply strategy according to the detected temperature of the heating layer to achieve temperature regulation and maintain stability.

[0034] Furthermore, a plurality of temperature sensors are arranged at intervals on the fixing unit, and the interval between two adjacent temperature sensors is 25-50 cm.

[0035] Preferably, the interval between two adjacent temperature sensors is 50 cm.

[0036] In the above scheme, the temperature sensors arranged at intervals can accurately detect the temperatures at different positions of the heating layer, further improving the temperature control sensitivity and adjustment accuracy.

[0037] The beneficial effects of the present invention are:

[0038] 1. Two layers of needle-punched polyester nonwoven fabric form a channel for the resistance wire to pass through in the unpunctured part. While fully fixing the resistance wire, no additional structure is introduced, ensuring that the heating layer structure is simple and reliable; polyester nonwoven is a mesh fabric made of added flame-retardant polyester staple fibers through combing and needle-punching. While preventing the resistance wire from directly contacting the industrial equipment that needs insulation, the flexible constant temperature sleeve has a higher heating temperature range and will not cause fire due to high operating temperature, thereby improving safety.

[0039] 2. The antistatic layer is interwoven with conductive yarn and polyester yarn, which realizes the antistatic function while maintaining the flexibility of the antistatic layer; by flame retardant treatment of the polyester yarn, the antistatic layer can also have flame retardant ability, further improving the safety of the flexible constant temperature cover.

[0040] 3. The electric heating device of the constant temperature system is connected to both ends of the resistance wire to form a loop. The temperature of the heating layer is detected by a temperature sensor that is communicatively connected to the electric heating device, so that the electric heating device can adjust corresponding parameters according to the actual temperature of the heating layer to achieve accurate regulation and maintenance of the temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of the heating layer in the flexible constant temperature sleeve of the present invention.

[0042] Figure 2 This is a perspective structural diagram of the heating layer in the flexible constant temperature sleeve of the present invention.

[0043] Figure 3 The figure is a schematic diagram of the structure of the flexible constant temperature sleeve of the present invention.

[0044] In the figure: 1. constant temperature part; 11. heating layer; 111. fixing unit; 112. resistance wire; 12. thermal insulation layer; 13. antistatic layer; 14. waterproof and flame retardant layer; 2. connecting part. DETAILED DESCRIPTION

[0045] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that the following embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0047] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0048] The present invention provides a flexible constant temperature sleeve, such as Figures 1 to 3 As shown, it includes a constant temperature portion 1 and a connecting portion 2 located around the constant temperature portion 1. The constant temperature portion 1 includes a heating layer 11 and a heat preservation layer 12 stacked in sequence. The heating layer 11 includes:

[0049] Resistance wire 112,

[0050] The fixing unit 111 comprises two layers of polyester nonwoven fabrics, and the two layers of polyester nonwoven fabrics are stacked and connected by needle punching;

[0051] The non-needle-punched parts of the two layers of polyester nonwoven fabric form a channel for fixing the resistance wire 112 , thereby fixing the resistance wire 112 on the fixing unit 111 .

[0052] In the above scheme, two layers of polyester nonwoven fabric are connected by needle punching, and a channel for fixing the resistance wire 112 is formed in the non-needle punched part, so that the resistance wire 112 can pass through the channel and be stably fixed on the fixing unit 111. The overall structure is as follows: Figure 1As shown, this arrangement reduces the structural complexity of the heating layer 11. Compared with the traditional fixing method, it can ensure the integrity of the two layers of polyester non-woven fabric, is beneficial to maintaining the strength of the flexible constant temperature sleeve, and is not easy to be damaged during use, thereby improving the user experience.

[0053] The following is a further detailed description with reference to specific embodiments.

[0054] Embodiment 1

[0055] As an embodiment of the present invention, this embodiment provides a flexible constant temperature sleeve, wherein the channels formed by the non-needle-punched parts of the two layers of polyester non-woven fabric of the heating layer 11 are not straight lines.

[0056] In this embodiment, if Figure 2 As shown, the non-needle-punched channel formed by the two layers of polyester nonwoven fabric is corrugated. After the resistance wire 112 passes through one end of the corrugated channel, it bends several times along the corrugated channel and finally passes through the other end, thereby fully fixing the resistance wire 112. After the resistance wire 112 passes through, it is limited by the corrugated channel and cannot fall out, thereby improving the working stability and reliability of the flexible constant temperature sleeve.

[0057] It should be noted that, in this embodiment, the resistance wire 112 can be placed between two layers of polyester nonwoven fabrics before being connected by needle punching, or the resistance wire 112 can be inserted after being connected by needle punching to form a channel.

[0058] In order to further improve the temperature consistency of the flexible thermostatic sleeve, the wave top and wave top of the corrugated channel are respectively close to the opposite sides of the heating layer 11, so that the corrugated channel can cover the heating layer 11 as much as possible, and the relative resistance wire 112 covers a larger range of the heating layer 11. On the one hand, it ensures that the flexible thermostatic sleeve has a higher heating efficiency, and at the same time, it also improves the consistency of the temperature at various positions of the heating layer 11.

[0059] Furthermore, the two layers of polyester nonwoven fabric of the heating layer 11 are mesh fabrics made of added flame-retardant polyester staple fibers through combing and needle punching. Due to its flame-retardant properties, it can prevent the resistance wire 112 from overheating and causing the fixed unit 111 to catch fire, thereby improving the safety of the flexible constant temperature sleeve; the mesh structure of the fabric can also ensure that the heat generated by the resistance wire 112 is smoothly transferred to the outside, thereby achieving thermal insulation of industrial equipment.

[0060] Further, such as Figure 3As shown, the constant temperature part 1 also includes an antistatic layer 13 stacked with the heating layer 11. The antistatic layer 13 is an antistatic polyester imitation silk obtained by interweaving conductive yarns and polyester yarns. The flexibility of the polyester yarns is fully utilized, so that the antistatic layer 13 has excellent deformation ability. On the other hand, the presence of the conductive yarns can effectively eliminate the static electricity generated in the flexible constant temperature sleeve, improve the safety of the constant temperature flexible sleeve, and form the polyester yarn and the conductive yarn into one by interweaving, which ensures that the antistatic layer 13 is overall light and thin, convenient for practical use, and improves the user experience.

[0061] It should be noted that the antistatic layer 13 can be arranged on any side of the fixed unit 111. When the antistatic layer 13 is located between the fixed unit 111 and the thermal insulation layer 12, the distance between the resistance wire 112 and the industrial equipment to be insulated is further increased, which is beneficial to improving the thermal insulation effect; when the antistatic layer 13 is located between the fixed unit 111 and the industrial equipment, the conductive wire can be used as a part of the heat transfer medium to improve the heat transfer efficiency; preferably, the polyester wire in the antistatic layer 13 is also flame-retardant treated, so that the antistatic layer 13 also has excellent flame-retardant properties, further reducing the risk of spontaneous combustion of the flexible constant temperature sleeve and improving the safety of use of the flexible sleeve.

[0062] Furthermore, the thermal insulation layer 12 is made of down material that has been treated with flame retardancy. Since the down material has been treated with flame retardancy, the safety of the flexible constant temperature sleeve is further improved, and the probability of spontaneous combustion due to excessive temperature is effectively avoided.

[0063] Furthermore, the flexible thermostatic sleeve also has a waterproof and flame-retardant layer 14, which is located on the other side of the insulation layer 12 opposite to the heating layer 11, that is, the waterproof and flame-retardant layer 14 is located on the outermost layer of the flexible thermostatic sleeve, which can prevent external water from entering the flexible thermostatic sleeve. The waterproof and flame-retardant layer 14 also has excellent flame-retardant properties. On the one hand, it prevents the spread of internal fire, and on the other hand, it can also avoid the influence of external fire. To a certain extent, the flexible thermostatic sleeve can be used as a fireproof layer to protect industrial equipment. In this embodiment, the waterproof and flame-retardant layer 14 is a PU fabric or TPU fabric made of flame-retardant slurry.

[0064] Based on the technical principles of the present invention, conventional replacements made by those skilled in the art on the materials and stacking sequence of the waterproof and flame-retardant layer 14 and the thermal insulation layer 12 also fall within the protection scope of the present invention.

[0065] Furthermore, the flexible constant temperature sleeve also includes a fixing part, which is arranged around the edge of the constant temperature portion 1, and the constant temperature portion 1 is fixed by the fixing part, and the connecting part 2 is connected to the constant temperature portion 1 through the fixing part; the fixing part is also made of flexible material. In the present embodiment, the fixing part is also polyester cloth treated with flame retardant. The fixing part fixes the constant temperature portion 1 of the stacked structure from the edge of the constant temperature portion 1, thereby improving the compactness and stability of the structure of the constant temperature portion 1, and the connection is not connected to the constant temperature portion 1 through the fixing part, thereby reducing the connection difficulty, and at the same time realizing the modular design of the flexible constant temperature sleeve, which can replace damaged parts in a targeted manner, thereby improving the user experience; the fixing part wraps the edge of the constant temperature portion 1 and fixes the constant temperature portion 1 by sewing; the conventional replacement of the fixing method of the fixing part made by technicians in this field on the basis of knowing the technical principles of the present invention also falls within the protection scope of the present invention.

[0066] Furthermore, the connecting part 2 can also be made of flame-retardant polyester cloth, sewn on the fixed part, or the fixed part can be integrally arranged, and the connecting part 2 can be a buckle and claw that cooperate with each other, or it can be a structure such as Velcro that other cooperation is used to achieve connection; in order to improve the convenience of use of the flexible constant temperature system, the connecting part 2 is at least arranged on two opposite sides of the flexible constant temperature sleeve, and multiple flexible constant temperature sleeves can be connected to each other through the connecting part 2, which meets the use requirements of industrial equipment of different sizes and realizes the combined use of multiple flexible constant temperature sleeves.

[0067] Preferably, the connecting portion 2 is located on two opposite sides of the flexible thermostatic sleeve. At this time, in order to facilitate the electrical connection of the resistance wire 112, the two outlets of the channel for fixing the resistance wire 112 are not arranged on the same side as the connecting portion 2, thereby reducing the difficulty of connecting multiple flexible thermostatic sleeves, improving the covering integrity of the flexible thermostatic sleeve for industrial equipment, and facilitating the connection of the power supply line of the resistance wire 112.

[0068] Embodiment 2

[0069] As another embodiment of the present invention, this embodiment differs from the first embodiment in that the shape of the channel formed on the non-needle puncture part of the fixing unit 111 is different.

[0070] In this embodiment, the channel formed by the non-acupuncture part of the fixing unit 111 is a straight channel set through the fixing unit 111; this setting method facilitates the installation and removal of the resistance wire 112 and improves the flexibility of use of the flexible constant temperature sleeve.

[0071] Furthermore, the non-acupuncture part on the fixing unit 111 forms a plurality of channels arranged in parallel, and the user can choose to insert the resistance wire 112 in some channels according to actual use requirements, thereby meeting the use requirements of different users; and the resistance wire 112 arranged in parallel can provide heat more evenly, thereby ensuring the temperature consistency of the flexible thermostatic sleeve; or as an alternative to the above-mentioned scheme, a plurality of channels are radially arranged from the center of the fixing unit 111 to the surrounding areas, thereby better realizing the heating of the flexible thermostatic sleeve.

[0072] The present invention also provides a constant temperature system, which has the flexible constant temperature sleeve described in the above embodiment, specifically as follows:

[0073] Embodiment 3

[0074] As another embodiment of the present invention, this embodiment provides a constant temperature system having the flexible constant temperature sleeve as described in the first embodiment.

[0075] In this embodiment, the constant temperature system includes a flexible constant temperature sleeve and an electric heating device. The electric heating device is respectively connected to two ends of the resistance wire 112 to form a power supply circuit, and supplies power to the resistance wire 112.

[0076] Furthermore, the constant temperature system also includes a temperature sensor, which is fixed on the fixed unit 111 of the flexible constant temperature sleeve and is communicated with the electric heating device for detecting the temperature of the heating layer 11. The electric heating device can adjust the power supply strategy according to the detected temperature of the heating layer 11 to achieve temperature regulation and maintain stability.

[0077] Furthermore, there is a control unit for controlling the temperature of the thermostatic system. The control unit is communicatively connected to the thermostatic system, can receive signals from the thermostatic system and adjust the thermostatic system; for example, the control unit can adjust the upper and lower temperature limits of the flexible thermostatic sleeve, and issue an alarm when the temperature sent back by the temperature sensor is higher than the upper limit or lower than the lower limit, automatically or reminding the user to actively make adjustments.

[0078] Furthermore, the control unit has a display capable of displaying the real-time temperature of the flexible heating sleeve, so that the user can intuitively understand the specific temperature status.

[0079] Furthermore, a plurality of temperature sensors are arranged at intervals on the fixing unit 111, and the interval between two adjacent temperature sensors is 25-50 cm.

[0080] Preferably, the interval between two adjacent temperature sensors is 50 cm.

[0081] In the above scheme, the temperature sensors arranged at intervals can accurately detect the temperatures at different positions of the heating layer 11, further improving the temperature control sensitivity and adjustment accuracy.

[0082] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A flexible constant temperature sleeve, comprising a constant temperature portion and a connecting portion located around the constant temperature portion, characterized in that: The constant temperature part includes a heating layer and a heat preservation layer which are stacked in sequence, and the heating layer includes: Resistance wire, The fixing unit is made entirely of polyester nonwoven fabric, and the resistance wire is fixed on the fixing unit by needle punching.

2. The flexible constant temperature sleeve according to claim 1, characterized in that: The fixing unit comprises two layers of polyester nonwoven fabrics, and the two layers of polyester nonwoven fabrics are stacked and connected by needle punching; The non-needle punched parts of the two layers of polyester nonwoven fabric form channels for fixing the resistance wires.

3. The flexible constant temperature sleeve according to claim 2, characterized in that: The non-needle-punched parts of the two layers of polyester nonwoven fabric form a corrugated channel, and openings for the resistance wire to pass in and out are formed on opposite sides of the fixing unit.

4. The flexible constant temperature sleeve according to claim 1, characterized in that: The constant temperature part also includes an antistatic layer, which is stacked with the heating layer and the heat preservation layer; The antistatic layer is an antistatic polyester imitation silk obtained by interweaving conductive yarn and polyester yarn; Preferably, the polyester yarn is flame-retardantly treated and then interwoven with the conductive yarn to obtain the antistatic polyester imitation silk.

5. The flexible constant temperature sleeve according to claim 1, characterized in that: The heat-insulating layer is made of down material that has been subjected to flame retardant treatment.

6. The flexible constant temperature sleeve according to claim 1, characterized in that: The constant temperature part also includes a waterproof and flame-retardant layer, which is stacked with the heating layer and the insulation layer and is located on the other side of the insulation layer opposite to the heating layer; The waterproof and flame-retardant layer is a PU fabric or a TPU fabric made of a flame-retardant slurry.

7. The flexible constant temperature sleeve according to any one of claims 1 to 6, characterized in that: Also includes, A fixing part, arranged around the edge of the constant temperature part, and fixing the constant temperature part through the fixing part; The connecting part is connected to the constant temperature part through a fixing part.

8. A constant temperature system having a flexible constant temperature sleeve as claimed in any one of claims 1 to 7, characterized in that: It also includes an electric heating device, and both ends of the resistance wire are respectively connected to the electric heating device to form a loop.

9. The constant temperature system according to claim 8, characterized in that: It also includes a temperature sensor, which is fixed on the fixing unit and is communicatively connected with the electric heating device.

10. The constant temperature system according to claim 9, characterized in that: A plurality of temperature sensors are arranged at intervals on the fixed unit, and the interval between two adjacent temperature sensors is 50 cm.

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