Heat preservation type self-heating life jacket

Abstract

The invention discloses a heat preservation type self-heating life jacket which comprises a life jacket body. A self-heating module is arranged on the back of the life jacket body; the self-heating module comprises a heating layer, a hydrophilic layer and a waterproof protection layer which are sequentially stacked from inside to outside; the thickness of the hydrophilic layer is gradually increased from bottom to top; the waterproof protection layer is detachably connected with the hydrophilic layer so as to expose the hydrophilic layer; the heating layers can be sequentially consumed from bottom to top, so that the continuity and stability of heating are guaranteed, a person falling into water can be kept warm for a longer time, the person falling into water can be effectively prevented from losing the temperature due to low temperature, and the survival probability of the person falling into water in water is increased.

Description

Technical Field

[0001] The invention relates to the technical field of underwater lifesaving, in particular to a heat-insulating self-heating life jacket. Background Art

[0002] In water activities, life jackets are key safety equipment. Their core function is to provide buoyancy for people who fall into the water, ensuring that they can float on the water surface, thereby buying precious time for rescue. However, in actual applications, especially in cold water environments, traditional life jackets that only have buoyancy functions have obvious limitations.

[0003] Although the materials and structures of life jackets on the market have been continuously optimized to improve buoyancy and wearing comfort, they are still insufficient in terms of thermal insulation measures. Although some products try to use thick materials to block the cold wind, the problem of heat loss in the water cannot be fundamentally solved. Moreover, these "thermal insulation" life jackets often sacrifice lightness and flexibility while increasing thermal insulation performance, which brings inconvenience to the activities of people who fall into the water and may even affect their self-rescue ability; therefore, it is of great practical significance to develop a life jacket that can generate heat and keep warm. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a thermal insulation self-heating life jacket, so that the heating layer can be consumed in sequence from bottom to top, thereby ensuring the continuity and stability of heating, providing more lasting warmth for the person who falls into the water, thereby effectively preventing the person who falls into the water from hypothermia due to low temperature and increasing the person's chance of survival in the water.

[0005] To achieve the above object, the specific scheme of the present invention is as follows:

[0006] A heat-insulating self-heating life jacket comprises a life jacket body; a self-heating module is arranged on the back of the life jacket body; the self-heating module comprises a heating layer, a hydrophilic layer and a waterproof protective layer which are sequentially stacked from the inside to the outside; the thickness of the hydrophilic layer gradually increases from bottom to top; the waterproof protective layer is detachably connected to the hydrophilic layer to expose the hydrophilic layer.

[0007] Optionally, the heating layer includes a plurality of heating blocks separated by non-woven fabric covering, and the plurality of heating blocks are arranged in sequence and spaced apart along the height direction of the hydrophilic layer.

[0008] Optionally, the heating block includes iron powder, activated carbon, inorganic salt and auxiliary materials; the auxiliary materials are one or two of vermiculite and water-absorbent resin.

[0009] Optionally, the hydrophilic layer is made of a water-soluble high molecular polymer.

[0010] Optionally, the water-soluble high molecular polymer is gelatin or polyvinyl alcohol.

[0011] Optionally, a sealing ring is further provided on the inner side of the back of the life jacket body.

[0012] Optionally, a plurality of heat-conducting sheets are embedded in the back of the life jacket body, and the plurality of heat-conducting sheets are arranged at intervals along the width direction of the life jacket body; the upper end of each heat-conducting sheet is in contact with the heating layer.

[0013] Optionally, a floating piece is provided on the outer side of the front portion of the life jacket body; the floating piece is made of polystyrene foam material.

[0014] Optionally, a connecting ear is provided on the outer surface of the waterproof protective layer so that the waterproof protective layer can be removed from the hydrophilic layer through the connecting ear.

[0015] Optionally, an adjustment device is provided on the outer side of the back of the life jacket body; the adjustment device includes an I-shaped guide seat; rudder surface assemblies are slidably provided between the two ends of the upper cross arm of the guide seat and the two ends of the lower cross arm, that is, the rudder surface assembly is slidably provided between the two ends of the upper cross arm and the lower cross arm on the same side; the two rudder surface assemblies have the same structure; each rudder surface assembly is passed through a draw rope, and lugs are provided at intervals on both sides of the life jacket body; the two ends of the draw rope are respectively passed through the lugs, and the two ends of the draw rope are connected to the same float; when the rudder surface assembly slides out of the guide seat, the rudder surface assembly can be pulled to swing by the draw rope.

[0016] The beneficial effects of the present invention are as follows: when the thermal insulation self-heating life jacket of the present invention is used, the waterproof protective layer is torn off the hydrophilic layer. The hydrophilic layer has good water absorption. Water first penetrates into the heating layer through the thin end of the hydrophilic layer, causing the heating layer to start reacting and generating heat. Since the thickness of the hydrophilic layer gradually increases from bottom to top, the heating layer can be consumed in sequence from bottom to top, thereby ensuring the continuity and stability of the heating, providing more lasting warmth for the person who falls into the water, thereby effectively preventing the person who falls into the water from hypothermia due to low temperature, and increasing the survival rate of the person who falls into the water. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram provided by Embodiment 1 of the present invention;

[0018] Figure 2 is a cross-sectional schematic diagram provided by Embodiment 1 of the present invention;

[0019] Figure 3 is a structural schematic diagram of another perspective provided by the first embodiment of the present invention;

[0020] Figure 4 is a cross-sectional schematic diagram of a self-heating module provided in Embodiment 1 of the present invention;

[0021] Figure 5is a schematic structural diagram of a control surface assembly in a retracted state provided by Embodiment 2 of the present invention;

[0022] Figure 6 is a schematic structural diagram of a control surface assembly provided in the second embodiment of the present invention when it is in an open state;

[0023] Figure 7 is a cross-sectional schematic diagram of the control surface assembly provided by the second embodiment of the present invention when it is in a stored state;

[0024] Figure 8 is a schematic structural diagram of a control surface assembly provided in Embodiment 2 of the present invention when it is in an open state;

[0025] Fig. 9 is a schematic structural diagram of a control surface assembly provided by Embodiment 2 of the present invention when the control surface assembly is in an open state and the guide seat is hidden;

[0026] Fig.10 is a schematic diagram of the structure of the support rod, the swing member and the second spring provided in the second embodiment of the present invention;

[0027] Fig.11 is a cross-sectional schematic diagram of a support base provided in Embodiment 2 of the present invention;

[0028] Fig.12 is a schematic structural diagram of a guide seat provided in Embodiment 2 of the present invention;

[0029] Explanation of reference numerals: 1. Life jacket body; 11. Lug; 12. Fastening assembly; 2. Self-heating module; 21. Heating layer; 211. Non-woven fabric; 212. Heating block; 22. Hydrophilic layer; 23. Waterproof protective layer; 231. Connecting lug; 3. Sealing ring; 4. Heat transfer sheet; 5. Floating member; 6. Adjusting device; 61. Guide seat; 611. First parallel section; 612. Second parallel section; 613. Connecting section; 614. Third parallel section; 621. High-pressure gas tank; 622. Ejector pin Mouth; 623, first spring; 624, water-soluble limit block; 625, telescopic hose; 631, support seat; 6311, arc hole; 6312, locking hole; 632, slider; 633, torsion spring; 634, support rod; 6341, hinge shaft; 635, foldable rudder surface; 6361, first rocker arm; 6362, second rocker arm; 6363, first bayonet; 6364, second bayonet; 6365, connecting shaft; 637, second spring; 638, pull rope; 6381, float. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation scope of the present invention is not limited thereto.

[0031] Embodiment 1: Figures 1 to 4As shown, a heat-insulating self-heating life jacket described in this embodiment includes a life jacket body 1; a self-heating module 2 is provided on the back of the life jacket body 1; the self-heating module 2 includes a heating layer 21, a hydrophilic layer 22 and a waterproof protective layer 23 stacked in sequence from the inside to the outside; the thickness of the hydrophilic layer 22 gradually increases from bottom to top; the waterproof protective layer 23 is detachably connected to the hydrophilic layer 22 to expose the hydrophilic layer 22.

[0032] Specifically, when the thermal insulation self-heating life jacket of this embodiment is in use, the waterproof protective layer 23 is torn off the hydrophilic layer 22. The hydrophilic layer 22 has good water absorption. Water first penetrates into the heating layer 21 through the thin end of the hydrophilic layer 22, causing the heating layer 21 to react and generate heat. Since the thickness of the hydrophilic layer 22 gradually increases from bottom to top, the heating layer 21 can be consumed in sequence from bottom to top, thereby ensuring the continuity and stability of the heating, providing more lasting warmth for the person who falls into the water, thereby effectively preventing the person who falls into the water from hypothermia due to low temperature, and increasing the survival rate of the person who falls into the water.

[0033] like Figure 2 and Figure 4 As shown, in the thermal insulation self-heating life jacket of this embodiment, in some embodiments, the heating layer 21 includes a plurality of heating blocks 212 separated by a non-woven fabric 211, and the plurality of heating blocks 212 are arranged in sequence along the height direction of the hydrophilic layer 22; such arrangement allows the plurality of heating blocks 212 to contact with water in sequence from bottom to top, so that the heating blocks 212 spontaneously generate heat to keep the user warm, thereby ensuring the continuity and stability of the heating.

[0034] In the thermal insulation self-heating life jacket of this embodiment, in some implementations, the heating block 212 includes iron powder, activated carbon, inorganic salt and auxiliary materials; the auxiliary materials are one or two of vermiculite and water-absorbent resin; that is, the heating principle of the heating block 212 is the same as the heating principle of the hot pack, thereby achieving a self-heating effect, and its principle process will not be repeated here.

[0035] In the heat-insulating self-heating life jacket of this embodiment, in some embodiments, the hydrophilic layer 22 is made of a water-soluble polymer. Preferably, the water-soluble polymer is gelatin or polyvinyl alcohol. This arrangement ensures water permeability, thereby ensuring that the heating block 212 can contact water and react spontaneously to generate heat.

[0036] like Figure 2 and Figure 3 As shown, in the heat-insulating self-heating life jacket of this embodiment, in some embodiments, a sealing ring 3 is further provided on the inner side of the back of the life jacket body 1. Specifically, when in use, the sealing ring 3 contacts the back of the user, so that the heat of the heating block 212 can effectively play a role.

[0037] like Figure 2 As shown, in the heat-insulating self-heating life jacket of this embodiment, in some embodiments, a plurality of heat-conducting sheets 4 are embedded in the back of the life jacket body 1, and the plurality of heat-conducting sheets 4 are arranged at intervals along the width direction of the life jacket body 1; the upper end of each heat-conducting sheet 4 is in contact with the heating layer 21. In this embodiment, by providing a plurality of heat-conducting sheets 4, the heat generated by the heating layer 21 is conducted to the entire back of the user, and the warming effect is better. Preferably, the heat-conducting sheet 4 is a copper sheet, which has a higher heat conduction efficiency.

[0038] like Figure 2 and Figure 3 As shown, in the heat-insulating self-heating life jacket of this embodiment, in some embodiments, a floating member 5 is provided on the outer side of the front of the life jacket body 1; the floating member 5 is made of polystyrene foam material. By providing the floating member 5, this embodiment can prevent the life jacket body 1 from being unable to be used normally due to air leakage. Preferably, there are multiple floating members 5, and the multiple floating members 5 are evenly distributed on the front of the life jacket body 1.

[0039] like Figure 1 , Figure 2 and Figure 4 As shown, in the heat-insulating self-heating life jacket of this embodiment, in some embodiments, the outer surface of the waterproof protective layer 23 is provided with a connecting ear 231, so that the waterproof protective layer 23 can be removed from the hydrophilic layer 22 through the connecting ear 231. In this way, in actual use, the waterproof protective layer 23 can be easily torn off through the connecting ear 231, and the operation is more convenient.

[0040] like Figure 3 As shown, the heat-insulating self-heating life jacket of this embodiment, in some embodiments, the front outer side buckle assembly 12 of the life jacket body 1. This embodiment provides the buckle assembly 12 so that the life jacket body 1 can be reliably restrained on the user, effectively preventing the life jacket body 1 from being loosened from the user, and the structure is more reliable to use. Exemplarily, the buckle assembly 12 includes a restraint belt and a buckle.

[0041] Embodiment 2: Figures 5 to 12As shown, on the basis of the first embodiment, the heat-insulating self-heating life jacket of this embodiment is provided with an adjustment device 6 on the outer side of the back of the life jacket body 1; the adjustment device 6 comprises an I-shaped guide seat 61; rudder surface assemblies are slidably provided between the two ends of the upper cross arm of the guide seat 61 and the two ends of the lower cross arm, that is, the rudder surface assembly is slidably provided between the two ends of the upper cross arm and the lower cross arm on the same side; the two rudder surface assemblies have the same structure; each rudder surface assembly is penetrated by a drawstring 638, and lugs 11 are provided at intervals on both sides of the life jacket body 1; the two ends of the drawstring 638 respectively penetrate the lugs 11, and the two ends of the drawstring 638 are connected to the same float 6381; when the rudder surface assembly slides out of the guide seat 61, the rudder surface assembly can be pulled to swing by the drawstring 638.

[0042] Specifically, a lug 11 is provided on the life jacket body 1 to fix the drawstring 638 so that the user can grab it and pull the drawstring 638. A float 6381 is provided to facilitate the user to grab the drawstring 638 in the water and prevent the drawstring 638 from detaching from the rudder surface assembly. When in use, the two rudder surface assemblies are slid out of the guide seat 61, and then the user grabs the floating float 6381 and pulls the drawstring 638 through the float 6381, thereby pulling the rudder surface assembly to swing through the drawstring 638. Figure 6 As shown, the deflection angle of the rudder assembly is adjusted, so that the water flow acting on the rudder assembly with different deflection angles will generate forces of different directions and magnitudes, thereby driving the user to move in the direction he wants, achieving effective control of the floating direction, and allowing the user to independently control the floating direction in a complex water flow environment. This not only helps the drowning person to better conserve physical strength and wait for rescue, but also allows the user to actively approach a safe area or wait for rescue to a certain extent, which is conducive to reducing the difficulty of rescue and improving the efficiency of rescue. It not only ensures the safety and stability of the life jacket under normal circumstances, but also can quickly and reliably play a role after falling into the water, providing better protection and support for the drowning person.

[0043] like Figure 7 and Fig. 9 As shown, in the thermal insulation self-heating life jacket of this embodiment, in some embodiments, a high-pressure gas tank 621 and two ejector nozzles 622 respectively arranged above and below the high-pressure gas tank 621 are provided in the vertical arm of the guide seat 61, a first spring 623 is connected between the end of the ejector nozzle 622 away from the high-pressure gas tank 621 and the inner wall of the guide seat 61, and water-soluble limit blocks 624 are respectively provided in the vertical arm of the guide seat 61 corresponding to the two ejector nozzles 622; the water-soluble limit blocks 624 abut against the ejector nozzle 622 to keep the first spring 623 in a compressed state.

[0044] Specifically, after the life jacket body 1 enters the water, the water-soluble limit block 624 begins to dissolve, thereby releasing the restriction on the ejector nozzle 622. At this time, the first spring 623 is released, and the first spring 623 pushes the ejector nozzle 622 to slide quickly toward the high-pressure gas tank 621, so that the ejector nozzle 622 pierces the high-pressure gas tank 621, and the high-pressure gas in the high-pressure gas tank 621 is quickly released through the ejector nozzle 622, thereby pushing the two rudder surface assemblies to slide outward, that is, the two rudder surface assemblies automatically extend from both sides of the back of the life jacket body 1, so that the user can independently control the floating direction, which is conducive to improving the success rate of rescue.

[0045] Furthermore, if Figures 6 to 9 As shown, each rudder surface assembly includes a support seat 631 and two sliding sliders 632; one slider 632 is arranged on the upper cross arm, and the other slider 632 is arranged on the lower cross arm, and the two ends of the upper cross arm and the two ends of the lower cross arm are respectively provided with sliding grooves, and the two ends of the support seat 631 are respectively arranged in the sliding grooves, and the two ends of the support seat 631 are respectively hinged with the corresponding sliders 632; torsion springs 633 are connected between the two ends of the support seat 631 and the corresponding sliders 632; by providing the torsion spring 633, the torque of the torsion spring 633 is utilized, so that when the user releases the pull rope 638, the support seat 631 can be reset under the action of the torsion spring 633; ​​each slider 632 is respectively connected to the corresponding ejector nozzle 622 with a telescopic hose 625, that is, the telescopic hose 625 is connected between the upper slider 632 and the upper ejector nozzle 622, A telescopic hose 625 is connected between the slider 632 below and the ejector nozzle 622 located below; support rods 634 are respectively provided at both ends of the support seat 631, one end of the support rod 634 is hinged to the support seat 631, and a pull rope 638 is passed through the other ends of the two support rods 634; a foldable rudder surface 635 is connected between the two support rods 634, and the rudder surface is made of high-hardness fabrics such as aramid fiber plants and carbon fiber composite fabrics; when the two ends of the support seat 631 are respectively located in the slide groove, that is, when the support seat 631 is in a storage state, the support rod 634 is accommodated in the support seat 631, that is, in a storage state, so that the foldable rudder surface 635 is in a folded state; when the two ends of the support seat 631 slide out of the slide groove respectively, that is, when the support seat 631 is in an extended state, the support rod 634 flips outward to open, so that the foldable rudder surface 635 is in an open state.

[0046] Initially, the support seat 631 is located in the guide seat 61, and the support rod 634 is in a retracted state, so that the foldable rudder surface 635 is in a folded state; when the ejector nozzle 622 pierces the high-pressure gas tank 621, the high-pressure gas enters each telescopic hose 625 through the ejector nozzle 622, thereby pushing the respectively connected sliders 632 to slide, the telescopic hose 625 extends, and the slider 632 drives the support seat 631 to slide until the support seat 631 slides out of the slide groove. At this time, the support rod 634 flips outward and opens, so that the foldable rudder surface 635 is in an open state, so that the contact area between the rudder surface assembly and the water flow is larger, so as to adjust the floating direction.

[0047] Preferably, the upper cross arm and the lower cross arm are respectively provided with limiting grooves, and the slider 632 is slidably connected in the limiting grooves. Such a configuration prevents the slider 632 from detaching from the guide seat 61 under the action of air pressure, and the structural reliability is higher.

[0048] like Figures 8 to 10 As shown, in the heat-insulating self-heating life jacket of this embodiment, in some embodiments, a hinge shaft 6341 is provided at one end of the support rod 634, and swinging pieces are respectively provided on the two ends of the hinge shaft 6341; the swinging piece includes a first swing rod 6361 located in the support seat 631 and a second swing rod 6362 located outside the support seat 631, the first swing rod 6361 is provided with a first bayonet 6363, the second swing rod 6362 is provided with a second bayonet 6364, a connecting shaft 6365 is connected between the first swing rod 6361 and the second swing rod 6362, the support seat 631 is provided with an arc hole 6311 corresponding to the position of each swinging piece, and the connecting shaft 6365 movably passes through the arc hole 6311; a locking hole 6312 is provided at one end of the support seat 631 corresponding to each arc hole 6311; a second spring 637 is connected between the second swing rod 6362 and the support seat 631;

[0049] like Fig.12 As shown, the inner side wall of each slide groove is respectively provided with a guide groove; the guide groove includes a first parallel section 611, a second parallel section 612 and a connecting section 613 which are spaced apart from each other in an upper and lower direction; the length of the first parallel section 611 is smaller than the length of the second parallel section 612, and the two ends of the connecting section 613 are respectively connected to an end of the first parallel section 611 away from the vertical arm and an end of the second parallel section 612 away from the vertical arm, and an end of the second parallel section 612 away from the vertical arm is horizontally connected to a third parallel section 614, and the depth of the third parallel section 614 is greater than the depth of the second parallel section 612; when the support seat 631 is in the storage state, the hinge shaft 6341 is movably embedded in the second parallel section 612, and the second bayonet 6364 is movably embedded in the first parallel section 611.

[0050] Specifically, at the beginning, the hinge shaft 6341 is movably embedded in the second parallel section 612, and the second bayonet 6364 is movably embedded in the first parallel section 611; when the ejector nozzle 622 pierces the high-pressure gas tank 621, the support seat 631 slides outward, and the support seat 631 drives the support rod 634 and the foldable rudder surface 635 to move outward synchronously, and the hinge shaft 6341 and the second bayonet 6364 move along the second parallel section 612 and the first parallel section 611 respectively, and the second bayonet 6364 moves from the first parallel section 612 to the first parallel section 611. When the second parallel section 612 is connected to the second parallel section 611, the swing member is deflected and the connecting shaft 6365 moves along the trajectory of the circular arc hole 6311, thereby driving the support rod 634 to deflect through the hinge shaft 6341, so that the support rod 634 is turned outward, and the foldable rudder surface 635 changes from a folded state to an open state, until the second latch 6364 enters the second parallel section 612 through the connecting section 613, and the swing member is deflected by 90 degrees. At this time, the support rod 634 is fully opened outward, and the foldable rudder surface 635 is in a folded state. In this state, the first bayonet 6363 is aligned with the locking hole 6312. When the second bayonet 6364 and the hinge shaft 6341 both enter the third parallel section 614, since the depth of the third parallel section 614 is greater than the depth of the second parallel section 612, the second spring 637 is released, and the second spring 637 pushes the swing member to slide relative to the hinge shaft 6341, so that the swing member drives the first bayonet 6363 to be inserted into the locking hole 6312, thereby locking the swing member, so that the support rod 634 remains in the open state, thereby keeping the foldable rudder surface 635 in the open state until the second latch 6364 and the hinge shaft 6341 finish sliding out of the third parallel section 614. At this time, the support seat 631 slides out of the slide slot, while the slider 632 is still on the guide seat 61. Since the slider 632 and the support seat 631 are hingedly connected, the support seat 631 can swing at the hinge point, so that the foldable rudder surface 635 can swing flexibly, thereby facilitating the user to adjust the floating direction.

[0051] like Figures 6 to 9 As shown, in the heat-insulating self-heating life jacket of this embodiment, in some embodiments, guide plates are provided at both ends of the upper cross arm and the lower cross arm. In this embodiment, the guide plates are provided so as to retract the support seat 631 into the slide slot again, providing guidance for the support seat 631 to enter the slide slot.

[0052] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. A heat-insulating self-heating life jacket, characterized in that: The life jacket comprises a life jacket body; a self-heating module is arranged on the back of the life jacket body; the self-heating module comprises a heating layer, a hydrophilic layer and a waterproof protective layer which are sequentially stacked from the inside to the outside; the thickness of the hydrophilic layer gradually increases from the bottom to the top; the waterproof protective layer is detachably connected to the hydrophilic layer to expose the hydrophilic layer.

2. A heat-insulating self-heating life jacket according to claim 1, characterized in that: The heating layer comprises a plurality of heating blocks separated by non-woven fabrics, and the plurality of heating blocks are sequentially arranged at intervals along the height direction of the hydrophilic layer.

3. A heat-insulating self-heating life jacket according to claim 2, characterized in that: The heating block comprises iron powder, activated carbon, inorganic salt and auxiliary materials; the auxiliary materials are one or two of vermiculite and water-absorbent resin.

4. A heat-insulating self-heating life jacket according to claim 2, characterized in that: The hydrophilic layer is made of water-soluble high molecular polymer.

5. A heat-insulating self-heating life jacket according to claim 4, characterized in that: The water-soluble high molecular polymer is gelatin or polyvinyl alcohol.

6. A heat-insulating self-heating life jacket according to claim 1, characterized in that: A sealing ring is also provided on the inner side of the back of the life jacket body.

7. The heat-insulating self-heating life jacket according to claim 1, characterized in that: A plurality of heat-conducting sheets are also embedded in the back of the life jacket body, and the plurality of heat-conducting sheets are arranged at intervals along the width direction of the life jacket body; the upper end of each heat-conducting sheet is in contact with the heating layer.

8. The heat-insulating self-heating life jacket according to claim 1, characterized in that: A floating piece is arranged on the outer side of the front part of the life jacket body; the floating piece is made of polystyrene foam material.

9. The heat-insulating self-heating life jacket according to claim 1, characterized in that: The outer surface of the waterproof protective layer is provided with connecting ears so that the waterproof protective layer can be removed from the hydrophilic layer through the connecting ears.

10. The heat-insulating self-heating life jacket according to claim 1, characterized in that: An adjustment device is provided on the outer side of the back of the life jacket body; the adjustment device includes an I-shaped guide seat; rudder surface assemblies are slidably provided between the two ends of the upper cross arm of the guide seat and the two ends of the lower cross arm; the two rudder surface assemblies have the same structure; each rudder surface assembly is penetrated by a draw rope, and lugs are provided at intervals on both sides of the life jacket body; the two ends of the draw rope are respectively passed through the lugs, and the two ends of the draw rope are connected to the same float; when the rudder surface assembly slides out of the guide seat, the rudder surface assembly can be pulled to swing by the draw rope.

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