Multifunctional protective clothing for working in limited and complex environmental space

Abstract

The invention discloses a multifunctional protective garment for operation in limited and complex environmental space, which comprises a multi-layer extremely cold multifunctional protective garment body, and a strip-shaped flexible circulating heat preservation air pipe is arranged in the fabric of the multi-layer extremely cold multifunctional protective garment body; an air cushion heat preservation layer is formed in the thickness direction of the multi-layer extremely-cold multifunctional protective clothing body by a strip-shaped air guide channel extending along the path of the strip-shaped flexible circulating heat preservation air pipe in the strip-shaped flexible circulating heat preservation air pipe; a heat preservation gas circulator is arranged on the back of the multi-layer extremely-cold multifunctional protective garment body and can drive heat preservation gas in the strip-shaped flexible circulation heat preservation gas pipe to circularly flow along the path of the strip-shaped flexible circulation heat preservation gas pipe. The purposes of actively generating heat and uniformly circulating the whole body while preserving heat by the air cushion are achieved.

Description

Technical Field

[0001] The invention belongs to the field of protective clothing for working in extremely cold limited spaces. Background Art

[0002] When working in extremely cold and limited complex spaces such as ice storage and cold storage, simple multi-layer insulation protective clothing cannot fully meet the workers' cold protection needs. In the existing solutions, electric heating wires are sewn into the fabric of multi-layer insulation protective clothing, so that the workers can release heat into the protective clothing by turning on the power during work, thereby achieving the purpose of active cold protection.

[0003] Since the diameter of the heating wire monomer is very small when directly heating the protective clothing, the projection width of the heating wire is generally less than 2mm, which makes the heat too concentrated, resulting in uneven heating and local overheating. At the same time, the heating wire itself is metal and has no heat preservation ability. It has the characteristics of fast heating and fast heat dissipation, but the sustainability is not high. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a multifunctional protective clothing for working in limited and complex environment spaces, which can actively generate heat and evenly circulate heat around the body while maintaining heat with an air cushion.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention provides a multifunctional protective clothing for working in limited and complex environment spaces, comprising a multi-layer extreme cold multifunctional protective clothing body, wherein a belt-shaped flexible circulating thermal insulation air pipe is arranged in the fabric of the multi-layer extreme cold multifunctional protective clothing body, and a belt-shaped air guide channel extending along its own path in the belt-shaped flexible circulating thermal insulation air pipe forms an air cushion insulation layer in the thickness direction of the multi-layer extreme cold multifunctional protective clothing body; a thermal insulation gas circulator is arranged on the back of the multi-layer extreme cold multifunctional protective clothing body, and the thermal insulation gas circulator can drive the thermal insulation gas in the belt-shaped flexible circulating thermal insulation air pipe to circulate along the path of the belt-shaped flexible circulating thermal insulation air pipe.

[0006] Furthermore, the heat-insulating gas circulator comprises a disc-shaped shell, a heating cylinder capable of moving along the axial direction is coaxially arranged in the disc-shaped shell, and an annular air pumping diaphragm is coaxially arranged in the disc-shaped shell; the inner ring of the annular air pumping diaphragm is fixedly sealed and connected to the outer wall of the heating cylinder along the contour, and the outer ring of the annular air pumping diaphragm is fixedly sealed and connected to the inner wall of the circumferential wall of the disc-shaped shell along the contour; the annular air pumping diaphragm divides the inner ring of the disc-shaped shell into a cavity and a cavity; the lower ends of the a cavity and the b cavity are respectively connected and provided with a one-way air nozzle a and a one-way air nozzle b;

[0007] Both ends of the strip-shaped flexible circulating thermal insulation air pipe are on the back of the multi-layer extreme cold multifunctional protective clothing body, namely, thermal insulation air pipe end a and thermal insulation air pipe end b; thermal insulation air pipe end a and thermal insulation air pipe end b are connected to one-way air nozzle a and one-way air nozzle b respectively.

[0008] Furthermore, a structural column is coaxially arranged in the cylinder, and both ends of the structural column are coaxially and integrally connected to the two end walls of the disc-shaped shell; an end wall is coaxially arranged in one end of the cylinder, and a structural column through hole with an O-ring on the inner wall is arranged at the axis center of the end wall, and the structural column and the inner wall of the O-ring are movably sealed and cooperated.

[0009] Furthermore, a cylindrical coil bin is coaxially arranged in the wall of the heating cylinder, and an electric heating alloy wire coil is coaxially arranged in the cylindrical coil bin;

[0010] A plurality of a-breathing ports are arranged in a circumferential array on the end surface of the heating cylinder body close to the a-cavity, and the plurality of a-breathing ports connect the end of the cylindrical coil chamber away from the end wall with the a-cavity; a permanent magnet is coaxially fixedly installed outside the structural column; the permanent magnet is coaxially matched with the electric heating alloy wire coil; when the electric heating alloy wire coil is supplied with direct current, the electric heating alloy wire coil generates an electrothermal effect, and at the same time, the electromagnetic field generated by the power supply generates an interaction force with the permanent magnet along the axial direction;

[0011] The heating cylinder body comprises a coaxial inner cylinder and an outer cylinder; the cylindrical coil is located between the inner cylinder and the outer cylinder;

[0012] An annular breathing diaphragm is coaxially arranged within the enclosure of the inner tube, the inner ring of the annular breathing diaphragm seals and fixes the outer wall of the structural column along the contour, and the outer ring of the annular breathing diaphragm seals and fixes the inner wall of the inner tube along the contour, and a thermal breathing chamber is formed between the annular breathing diaphragm and the end wall; one end of the inner tube close to the end wall is hollowed out in a circular array and has a plurality of b breathing ports; the plurality of b breathing ports connect the end of the cylindrical coil chamber close to the end wall with the thermal breathing chamber.

[0013] Furthermore, a one-way air guide channel is provided in the structural column along the length direction, and the air guide end a and the air guide end b at both ends of the one-way air guide channel are connected to the a cavity and the b cavity respectively;

[0014] A first one-way valve is arranged in the one-way air guide channel, and the first one-way valve allows the air in the a chamber to flow into the b chamber through the one-way air guide channel, but not vice versa;

[0015] A second one-way valve is arranged in the one-way air nozzle a, and the second one-way valve allows the gas in the end a of the heat preservation air pipe to enter the a cavity through the one-way air nozzle a, and vice versa;

[0016] A second one-way valve is arranged in the b one-way air nozzle, and the second one-way valve allows the gas in the b cavity to enter the b end of the thermal insulation air pipe through the b one-way air nozzle, but not vice versa.

[0017] Furthermore, a DC power supply unit with switchable positive and negative poles is provided on the body or disc-shaped shell of the multi-layer extreme cold multifunctional protective clothing, and the output end of the DC power supply unit is electrically connected to the two ends of the electric heating alloy wire coil through a flexible conductor.

[0018] Furthermore, a temperature sensor is provided in the cylindrical coil bin.

[0019] Furthermore, an active cold-proof method for multifunctional protective clothing for working in limited and complex environment spaces is provided, in which a DC power supply unit continuously outputs DC power to the electric heating alloy wire coil while periodically switching the output positive and negative poles.

[0020] Beneficial effect: The belt-shaped air guide channel extending along its own path in the belt-shaped flexible circulating heat-insulating air tube of the present invention forms an air cushion heat-insulating layer in the thickness direction of the multi-layer extreme cold multifunctional protective clothing body, thereby achieving the effect of air cushion heat-insulating;

[0021] At the same time, the gas in cavity a continuously replenishes the gas heated by the electric heating alloy wire coil in the form of breathing during the "large circulation of heat-insulating gas". Thus, the gas flowing in the above-mentioned "large circulation of gas" keeps the temperature rising or keeping warm, thus achieving the effect of uniform heat generation and hot air flowing through the protective clothing, achieving the effect of active cold protection.

[0022] At the same time, this solution also makes the breathing flow of the thermal breathing chamber, the circulation flow of the large gas cycle and the heat generation rate in the cylindrical coil chamber completely positively correlated, thereby achieving a mutually balanced effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the multi-layer extreme cold multifunctional protective clothing.

[0024] Figure 2 This is a schematic diagram of the back of the multi-layer extreme cold multifunctional protective suit;

[0025] Figure 3 It is a schematic diagram of a heat preservation gas circulator;

[0026] Figure 4 is a first cross-sectional view of the heat-insulating gas circulator;

[0027] Figure 5 is a second cross-sectional view of the heat-insulating gas circulator;

[0028] Figure 6 for Figure 5 An enlarged schematic diagram of the area marked 17 in FIG. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] As attached Figures 1 to 6 A multifunctional protective suit for working in a limited and complex environment space is shown in FIG. Figure 1 and 2The figure shows a multi-layer extreme cold multifunctional protective clothing body 26, wherein a belt-shaped flexible circulating thermal insulation air tube 25 is arranged in the fabric of the multi-layer extreme cold multifunctional protective clothing body 26, wherein the belt-shaped flexible circulating thermal insulation air tube 25 is made of a flat flexible latex tube material, and the belt-shaped flexible circulating thermal insulation air tube 25 is filled with nitrogen, so that the belt-shaped air guide channel extending along its own path in the belt-shaped flexible circulating thermal insulation air tube 25 forms an air cushion insulation layer in the thickness direction of the multi-layer extreme cold multifunctional protective clothing body 26, thereby achieving the effect of air cushion insulation; a thermal insulation gas circulator 110 is arranged on the back of the multi-layer extreme cold multifunctional protective clothing body 26, and the thermal insulation gas circulator 110 can drive the thermal insulation gas in the belt-shaped flexible circulating thermal insulation air tube 25 to circulate along the path of the belt-shaped flexible circulating thermal insulation air tube 25.

[0031] like Figure 3 , 4 , 5, 6; the heat preservation gas circulator 110 includes a disc-shaped shell 24, in which a heating cylinder 1 capable of moving along the axial direction is coaxially arranged, and an annular sheet-shaped pumping diaphragm 6 is coaxially arranged in the disc-shaped shell 24; the inner ring of the annular sheet-shaped pumping diaphragm 6 is fixedly sealed along the contour to connect the outer wall of the heating cylinder 1, and the outer ring of the annular sheet-shaped pumping diaphragm 6 is fixedly sealed along the contour to connect the inner wall of the circumferential wall of the disc-shaped shell 24; the annular sheet-shaped pumping diaphragm 6 is fixedly sealed along the contour to connect the inner wall of the circumferential wall of the disc-shaped shell 24; The inner circle of the body 24 is divided into a cavity 22 and a cavity 23; the lower ends of the a cavity 22 and the b cavity 23 are respectively connected to the a one-way air nozzle 20 and the b one-way air nozzle 21; both ends of the belt-shaped flexible circulating thermal insulation air pipe 25 are on the back of the multi-layer extreme cold multifunctional protective clothing body 26, namely the thermal insulation air pipe a end 25.1 and the thermal insulation air pipe b end 25.2; the thermal insulation air pipe a end 25.1 and the thermal insulation air pipe b end 25.2 are respectively connected to the a one-way air nozzle 20 and the b one-way air nozzle 21.

[0032] A structural column 12 is coaxially arranged inside the cylinder 1, and the two ends of the structural column 12 are coaxially and integrally connected to the two end walls of the disc-shaped shell 24; an end wall 140 is coaxially and integrally arranged at one end of the cylinder 1, and a structural column through hole with an O-ring 8 on the inner wall is arranged at the axis center of the end wall 140, and the structural column 12 is movably sealed with the inner wall of the O-ring 8.

[0033] A cylindrical coil bin 3 is coaxially arranged in the wall of the heating cylinder 1 , a temperature sensor is arranged in the cylindrical coil bin 3 , and an electric heating alloy wire coil 2 is coaxially arranged in a spiral manner in the cylindrical coil bin 3 .

[0034] A plurality of a-breathing ports 15 are arranged in a circumferential array on the end surface of the heating cylinder 1 near the a-cavity 22, and the plurality of a-breathing ports 15 connect the end of the cylindrical coil bin 3 away from the end wall 140 with the a-cavity 22; a permanent magnet 14 is coaxially fixedly installed outside the structural column 12, and the outer diameter of the permanent magnet 14 is smaller than the inner diameter of the inner layer cylinder 1.2; the permanent magnet 14 is coaxially matched with the electric heating alloy wire coil 2; when the electric heating alloy wire coil 2 is energized with direct current, the electric heating alloy wire coil 2 generates an electrothermal effect, and at the same time, the electromagnetic field generated by the energization generates an interaction force with the permanent magnet 14 along the axial direction; the heating cylinder 1 includes a coaxial inner layer cylinder 1 .2 and the outer layer cylinder 1.1; the cylindrical coil bin 3 is between the inner layer cylinder 1.2 and the outer layer cylinder 1.1; an annular breathing diaphragm 4 is coaxially arranged within the enclosure of the inner layer cylinder 1.2, the inner circle of the annular breathing diaphragm 4 seals and fixes the outer wall of the structural column 12 along the contour, the outer circle of the annular breathing diaphragm 4 seals and fixes the inner wall of the inner layer cylinder 1.2 along the contour, and a thermal breathing bin 11 is formed between the annular breathing diaphragm 4 and the end wall 140; one end of the inner layer cylinder 1.2 close to the end wall 140 is hollowed out in a circular array and has a plurality of b breathing ports 7; a plurality of b breathing ports 7 connect one end of the cylindrical coil bin 3 close to the end wall 140 with the thermal breathing bin 11.

[0035] A one-way air guiding channel 13 is provided in the structural column 12 along the length direction. The air guiding end a 16 and the air guiding end b 9 at both ends of the one-way air guiding channel 13 are connected to the a cavity 22 and the b cavity 23 respectively.

[0036] A first one-way valve 10 is disposed in the one-way air guide channel 13 . The first one-way valve 10 allows the air in the a chamber 22 to flow into the b chamber 23 through the one-way air guide channel 13 , but not vice versa.

[0037] A second one-way valve 18 is arranged in the one-way air nozzle a 20. The second one-way valve 18 allows the gas in the end a 25.1 of the heat-insulating air pipe to enter the a cavity 22 through the one-way air nozzle a 20, but not vice versa.

[0038] A second one-way valve 19 is arranged in the b one-way air nozzle 21. The second one-way valve 19 allows the gas in the b chamber 23 to pass through the b one-way air nozzle 21 and enter the b end 25.2 of the heat preservation air pipe, but not vice versa.

[0039] The annular air pumping diaphragm 6 and the annular breathing diaphragm 4 of the present embodiment are both made of elastically deformable nitrile rubber.

[0040] A DC power supply unit with switchable positive and negative poles is provided on the multi-layer extreme cold multifunctional protective clothing body 26 or the disc-shaped shell 24, and the output end of the DC power supply unit is electrically connected to the two ends of the electric heating alloy wire coil 2 through a flexible wire.

[0041] Working principle: The belt-shaped air guide channel extending along its own path in the belt-shaped flexible circulating heat-insulating air tube 25 forms an air cushion insulation layer in the thickness direction of the multi-layer extreme cold multifunctional protective clothing body 26, thereby achieving the effect of air cushion insulation.

[0042] The DC power supply unit continuously outputs DC power to the electric heating alloy wire coil 2, while periodically switching the output positive and negative poles, so that the electric heating alloy wire coil 2 is periodically energized in the forward direction and reverse direction, and the time of one cycle is 3S;

[0043] Regardless of whether the electric heating alloy wire coil 2 is energized in the forward direction or the reverse direction, the electric heating alloy wire coil 2 will continue to generate heat under the main electrothermal effect, and then continue to heat the gas in the cylindrical coil bin 3, so that the gas in the narrow cylindrical coil bin 3 will quickly heat up. At the same time, the outer wall of the heating cylinder 1 itself gradually releases heat to the disc-shaped shell 24. Since there is no high-speed gas flowing through the surface of the heating cylinder, its heat release process is relatively slow.

[0044] When the electric heating alloy wire coil 2 is energized in the positive direction, the electromagnetic field generated by the electric heating alloy wire coil 2 generates an interaction force with the permanent magnet 14 along the axial direction; because the permanent magnet 14 is relatively fixed, the integrated structure formed by the electric heating alloy wire coil 2 and the heating cylinder 1 is displaced to the left as a whole under the action of the magnetic force. During the displacement of the heating cylinder 1 to the left, the annular pumping diaphragm 6 follows the heating cylinder 1 to squeeze the a cavity 22 to the left, so that the pressure in the a cavity 22 increases, and negative pressure is formed in the b cavity 23 due to the leftward displacement of the inner circle of the annular pumping diaphragm 6; the pressure After the force is increased, the gas in the a chamber 22 flows into the b chamber 23 in the negative pressure state through the one-way air guide channel 13 under the action of the pressure difference; at the same time, during the displacement of the heating cylinder 1 to the left, the distance between the permanent magnet 14 and the end wall 140 becomes shorter, so that the heat breathing chamber 11 in the annular breathing diaphragm 4 is squeezed, and the gas in the heat breathing chamber 11 is pressed into the cylindrical coil chamber 3 through the plurality of b breathing ports 7 under the squeezing of the annular breathing diaphragm 4, and the heated gas in the cylindrical coil chamber 3 is pressed out of the a chamber 22 through the plurality of a breathing ports 15;

[0045] When the electric heating alloy wire coil 2 is energized in the reverse direction, the electric heating alloy wire coil 2 generates a reverse electromagnetic field and generates an interaction force with the permanent magnet 14 along the axial direction; because the permanent magnet 14 is relatively fixed, the integrated structure formed by the electric heating alloy wire coil 2 and the heating cylinder 1 is displaced to the right as a whole under the action of the magnetic force. During the displacement of the heating cylinder 1 to the right, the annular sheet-shaped pump air diaphragm 6 follows the heating cylinder 1 to squeeze the b cavity 23 to the right, so that the pressure in the b cavity 23 increases. After the pressure increases, the gas in the b cavity 23 flows into the b end 25.2 of the insulation air pipe through the b one-way air nozzle 21 under the action of the pressure difference, and is pressed into the flexible circulation insulation air pipe 25; and the annular sheet-shaped pump air diaphragm 6 in the a cavity 22 is pressed to the right by the annular sheet-shaped pump air diaphragm 6. The inner circle of the air film 6 shifts to the right to form a negative pressure, and the gas in the flexible circulating thermal insulation air pipe 25 is driven by the negative pressure to be replenished into the gradually increasing a cavity 22 through the thermal insulation air pipe a end 25.1 and the a one-way air nozzle 20; at the same time, in the process of the heating cylinder 1 moving to the right, the distance between the permanent magnet 14 and the end wall 140 increases, so that the volume of the thermal breathing chamber 11 in the annular breathing diaphragm 4 gradually increases, thereby forming a negative pressure in the thermal breathing chamber 11, and the gas in the a cavity 22 is sucked into the cylindrical coil chamber 3 through a plurality of a breathing ports 15 under the action of negative pressure, and then is heated by the electric heating alloy wire in the narrow cylindrical coil chamber 3 and sucked into the thermal breathing chamber 11 through the b breathing port 7.

[0046] According to the above rules, during the periodic forward and reverse energization of the electrothermal alloy wire coil 2, the following large gas cycle is continuously formed:

[0047] Large circulation path of heat preservation gas: strip-shaped flexible circulation heat preservation gas pipe 25 → heat preservation gas pipe a end 25.1 → a one-way gas nozzle 20 → a cavity 22 → one-way air guide channel 13 → b cavity 23 → b one-way gas nozzle 21 → heat preservation gas pipe b end 25.2 → strip-shaped flexible circulation heat preservation gas pipe 25;

[0048] During the above-mentioned "large cycle of heat-insulating gas", the thermal breathing chamber 11 will also periodically expand and shrink like the breathing of the lungs. Under the breathing action of the thermal breathing chamber 11, the gas in the a cavity 22 is continuously inhaled from the a breathing port 15 and heated by the cylindrical coil chamber 3, and then inhaled into the thermal breathing chamber 11 through the b breathing port 7 during the above-mentioned "large cycle of heat-insulating gas". Then, the gas that has been heated for the first time and enters the thermal breathing chamber 11 is exhaled through the b breathing port 7 and heated for the second time by the cylindrical coil chamber 3, and then exhaled again into the a cavity 22 through a number of a breathing ports 15; thereby, the gas in the a cavity 22 is continuously replenished with the gas heated by the electric heating alloy wire coil 2 in the form of breathing during the above-mentioned "large cycle of heat-insulating gas"; thereby, the gas flowing in the above-mentioned "large cycle of heat-insulating gas" is kept in a state of continuous heating or heat preservation, thereby achieving the effect of uniform heat generation and hot air flowing through the protective clothing, and achieving the effect of active cold protection.

[0049] At the same time, this solution also makes the breathing flow of the thermal breathing chamber 11, the circulation flow of the large gas cycle and the heat generation rate in the cylindrical coil chamber 3 completely positively correlated, thereby achieving a mutually balanced effect.

[0050] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multifunctional protective clothing for working in limited and complex environment space, characterized by: The invention comprises a multi-layer extreme cold multifunctional protective clothing body (26), wherein a belt-shaped flexible circulating thermal insulation air pipe (25) is arranged in the fabric of the multi-layer extreme cold multifunctional protective clothing body (26), and a belt-shaped air guide channel extending along its own path in the belt-shaped flexible circulating thermal insulation air pipe (25) forms an air cushion thermal insulation layer in the thickness direction of the multi-layer extreme cold multifunctional protective clothing body (26); a thermal insulation gas circulator (110) is arranged on the back of the multi-layer extreme cold multifunctional protective clothing body (26), and the thermal insulation gas circulator (110) can drive the thermal insulation gas in the belt-shaped flexible circulating thermal insulation air pipe (25) to circulate along the path of the belt-shaped flexible circulating thermal insulation air pipe (25).

2. The multifunctional protective clothing for working in limited and complex environment space according to claim 1, characterized in that: The heat-insulating gas circulator (110) comprises a disc-shaped shell (24), wherein a heating cylinder (1) capable of moving along an axial direction is coaxially arranged in the disc-shaped shell (24), and an annular air pumping diaphragm (6) is coaxially arranged in the disc-shaped shell (24); the inner ring of the annular air pumping diaphragm (6) is fixedly and sealedly connected to the outer wall of the heating cylinder (1) along the contour, and the outer ring of the annular air pumping diaphragm (6) is fixedly and sealedly connected to the inner wall of the circumferential wall of the disc-shaped shell (24) along the contour; the annular air pumping diaphragm (6) divides the inner ring of the disc-shaped shell (24) into an a cavity (22) and a b cavity (23); the lower ends of the a cavity (22) and the b cavity (23) are respectively connected and provided with an a one-way air nozzle (20) and a b one-way air nozzle (21); Both ends of the belt-shaped flexible circulating heat-insulating air pipe (25) are on the back of the multi-layer extreme cold multifunctional protective clothing body (26), and are respectively the heat-insulating air pipe end a (25.1) and the heat-insulating air pipe end b (25.2); the heat-insulating air pipe end a (25.1) and the heat-insulating air pipe end b (25.2) are respectively connected to the a one-way air nozzle (20) and the b one-way air nozzle (21).

3. The multifunctional protective clothing for working in limited and complex environment space according to claim 2, characterized in that: A structural column (12) is coaxially arranged inside the cylinder (1), and the two ends of the structural column (12) are coaxially and integrally connected to the two end walls of the disc-shaped shell (24); an end wall (140) is coaxially arranged integrally at one end of the cylinder (1), and a structural column through hole with an O-type sealing ring (8) on the inner wall is arranged at the axis center of the end wall (140), and the structural column (12) and the inner wall of the O-type sealing ring (8) are movably sealed.

4. The multifunctional protective clothing for working in limited and complex environment space according to claim 3, characterized in that: A cylindrical coil bin (3) is coaxially arranged in the wall of the heating cylinder (1), and an electric heating alloy wire coil (2) is coaxially arranged in a spiral manner in the cylindrical coil bin (3); A plurality of a-breathing ports (15) are arranged in a circumferential array on the end surface of one end of the heating cylinder (1) close to the a-cavity (22), and the plurality of a-breathing ports (15) connect the end of the cylindrical coil bin (3) away from the end wall (140) with the a-cavity (22); a permanent magnet (14) is coaxially fixedly mounted outside the structural column (12); the permanent magnet (14) is coaxially matched with the electric heating alloy wire coil (2); when direct current is passed through the electric heating alloy wire coil (2), the electric heating alloy wire coil (2) generates an electrothermal effect and at the same time generates an electromagnetic field generated by the current and generates an interaction force along the axial direction with the permanent magnet (14); The heating cylinder (1) comprises a coaxial inner cylinder (1.2) and an outer cylinder (1.1); a cylindrical coil bin (3) is located between the inner cylinder (1.2) and the outer cylinder (1.1); An annular breathing diaphragm (4) is coaxially arranged within the enclosure of the inner layer cylinder (1.2); the inner ring of the annular breathing diaphragm (4) seals and fixes the outer wall of the structural column (12) along the contour; the outer ring of the annular breathing diaphragm (4) seals and fixes the inner wall of the inner layer cylinder (1.2) along the contour; a thermal breathing chamber (11) is formed between the annular breathing diaphragm (4) and the end wall (140); one end of the inner layer cylinder (1.2) close to the end wall (140) is hollowed out in a circular array and is provided with a plurality of b breathing ports (7); the plurality of b breathing ports (7) connect one end of the cylindrical coil chamber (3) close to the end wall (140) with the thermal breathing chamber (11).

5. The multifunctional protective clothing for working in limited and complex environment space according to claim 4, characterized in that: A one-way air guide channel (13) is provided in the structural column (12) along the length direction, and the air guide a end (16) and the air guide b end (9) at both ends of the one-way air guide channel (13) are connected to the a cavity (22) and the b cavity (23) respectively; A first one-way valve (10) is arranged in the one-way air guide channel (13), and the first one-way valve (10) allows the air in the a chamber (22) to flow into the b chamber (23) through the one-way air guide channel (13), but does not allow the air to flow into the b chamber (23) otherwise; A second one-way valve (18) is arranged inside the one-way air nozzle a (20), and the second one-way valve (18) allows the gas inside the end a (25.1) of the heat-insulating air pipe to pass through the one-way air nozzle a (20) and enter the a cavity (22), but not vice versa; The b one-way air nozzle (21) is provided with a second one-way valve (19), and the second one-way valve (19) allows the gas in the b chamber (23) to pass through the b one-way air nozzle (21) and enter the b end (25.2) of the heat-insulating air pipe, but not vice versa.

6. The multifunctional protective clothing for working in limited and complex environment space according to claim 5, characterized in that: A DC power supply unit capable of switching positive and negative poles is provided on the multi-layer extreme cold multifunctional protective clothing body (26) or the disc-shaped shell (24), and the output end of the DC power supply unit is electrically connected to two ends of the electric heating alloy wire coil (2) via a flexible wire.

7. The multifunctional protective clothing for working in limited and complex environment space according to claim 6, characterized in that: A temperature sensor is arranged in the cylindrical coil bin (3).

8. The active cold-proof method of multifunctional protective clothing for working in limited and complex environment space according to claim 7, characterized in that: The DC power supply unit continuously outputs DC power to the electric heating alloy wire coil (2) while periodically switching the output positive and negative poles.

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