Hand warmer

Abstract

The utility model discloses a hand warmer which comprises a shell, a battery, a heating control circuit electrically connected with the battery and a heating piece electrically connected with the heating control circuit, the outer surface of the shell is provided with a heat conduction part, the heat conduction part is used for conducting heat generated by the heating piece, and the outer surface of the heat conduction part is provided with a soft rubber sleeve. According to the utility model, the heat conduction part is protected and prevented from being scratched, the touch feeling during use is improved, and meanwhile, the heat dissipation speed is slowed down and the endurance time of the hand warmer is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hand warming equipment, in particular to a hand warmer. Background Art

[0002] There are many types of hand warming devices, including traditional hot water bottles and hand warmers that use heating elements (such as heating sheets and heating wires) to heat and keep warm. Hand warmers are becoming more and more widely used because of their small size, convenience in use and portability.

[0003] The outer shell of the hand warmer is generally provided with a heat conducting part, which is used to transfer heat to the human body for warming when touched by a human body such as a human hand. The heat conducting part of the existing hand warmer is generally a metal part, such as an aluminum plate, an aluminum sheet, etc. When a human hand directly touches the heat conducting part, the touch is stiff, and the experience is not soft and comfortable. In addition, the heat conducting part of the existing hand warmer is directly exposed to the air outside the shell of the hand warmer, so that the heat generated by the hand warmer is dissipated quickly, resulting in a fast consumption of the power of the hand warmer battery and a short battery life. At the same time, the heat conducting part is not protected and is easily scratched.

[0004] Therefore, the prior art needs to be improved. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a hand warmer, which aims to protect the heat conduction part to prevent scratches and improve the touch during use, while slowing down the heat dissipation speed to extend the life of the hand warmer.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A hand warmer comprises a housing, a battery, a heating control circuit electrically connected to the battery, and a heating element electrically connected to the heating control circuit, wherein the outer surface of the housing has a heat conducting portion, and the heat conducting portion is used to conduct heat generated by the heating element, wherein:

[0008] The outer surface of the heat conducting part is provided with a soft rubber sleeve.

[0009] In some examples, the soft rubber sleeve is made of thermally conductive silicone.

[0010] In some examples, the shell includes a first shell and a second shell that are matingly connected, a hook is provided at the edge of the soft rubber sleeve, an inner wall of the hook is buckled on the first shell, and an outer wall of the hook is crimped by the second shell.

[0011] In some examples, the soft rubber sleeve is a sheet-like structure that completely covers the heat-conducting portion.

[0012] In some examples, the soft rubber sleeve is a bag-shaped structure that covers the shell and the heat-conducting part.

[0013] In some examples, the soft rubber sleeve has a storage cavity, and the height and width of the storage cavity are 0.1 to 0.13 mm smaller than the height and width of the shell.

[0014] In some examples, the soft rubber sleeve is provided with a mounting port communicating with the storage cavity.

[0015] In some examples, the soft rubber sleeve is provided with an L-shaped hook portion extending outward from the installation opening, and the shell is provided with a slot for accommodating the L-shaped hook portion.

[0016] In some examples, the thickness of the soft rubber sleeve is 0.8 to 1.2 mm.

[0017] In some examples, the outer surface of the soft rubber sleeve is provided with anti-slip grooves.

[0018] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described below (such as implementation methods) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be described one by one here.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. The hand warmer of the utility model is provided with a soft rubber cover on the outer side of the heat conducting part of the shell. The soft rubber cover is made of soft material. Compared with the heat conducting part made of hard material, the soft rubber cover is more comfortable to touch during use. The heat conducted by the soft rubber cover makes the user experience the heating temperature softer, thereby improving the user's use experience.

[0021] 2. Cover the outside of the heat-conducting part with a soft rubber sleeve to protect it and prevent the heat-conducting part of the hand warmer from being scratched, dropped or bumped.

[0022] 3. Due to the material characteristics of the soft rubber cover, the heat dissipation efficiency of the soft rubber cover is lower than that of the heat conducting part. In this way, the soft rubber cover blocks the direct contact between the heat conducting part and the air, slowing down the heat dissipation speed of the hand warmer and effectively extending the battery life of the hand warmer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1This is a structural schematic diagram of the first embodiment of the hand warmer of the utility model.

[0025] Figure 2 for Figure 1 First exploded schematic representation of the structure.

[0026] Figure 3 for Figure 1 Second exploded schematic representation of the structure.

[0027] Figure 4 for Figure 1 The third decomposition diagram of the structure.

[0028] Figure 5 for Figure 1 Schematic cross-section of the structure.

[0029] Figure 6 for Figure 5 A magnified schematic diagram of center A.

[0030] Figure 7 A schematic diagram of implementing a soft rubber sleeve.

[0031] Figure 8 This is a structural schematic diagram of the second embodiment of the hand warmer of the present utility model.

[0032] Fig. 9 for Figure 8 First exploded schematic representation of the structure.

[0033] Fig.10 for Figure 8 Second exploded schematic representation of the structure.

[0034] Fig.11 for Figure 8 Schematic cross-section of the structure.

[0035] Fig.12 for Fig.11 A magnified schematic diagram of point B in the middle.

[0036] Reference numerals:

[0037] 100a, 100b-hand warmer, 1-shell, 101-card slot, 102-installation window, 103-pressing block, 11-first shell, 111-first front shell, 112-first rear shell, 12-second shell, 2-battery, 3-heating control circuit, 4-heating element, 5-heat conducting part, 6-soft rubber sleeve, 61-hook part, 601-inner wall, 602-outer wall, 611-first hook arm, 612-second hook arm, 62-storage cavity, 63-installation port, 64-anti-slip pattern, 65-button part, 7-interface, 8-LED light, 9-switch. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0042] The utility model includes the following embodiments.

[0043] Example 1, please refer to Figures 1 to 7, this embodiment provides a hand warmer 100a, which includes a shell 1, a battery 2, a heating control circuit 3 electrically connected to the battery 2, and a heating element 4 electrically connected to the heating control circuit 3. The outer surface of the shell 1 has a heat conducting portion 5, and the heat conducting portion 5 is used to conduct the heat generated by the heating element 4. Specifically, the battery 2 and the heating control circuit 3 of this embodiment are both arranged in the shell 1. It can be understood that in other embodiments, the battery 2 and the heating control circuit 3 can also be placed outside the shell 1. The battery 2 provides power for the electrical components in the hand warmer 100a. The heating control circuit 3 controls the opening and closing of the heating element 4, controls the temperature of the heating element 4, and manages the charging and discharging of the battery 2. The heating element 4 converts electrical energy into heat to generate heat, and the heat conducting portion 5 conducts the heat generated by the heating element 4 to human body parts such as hands, feet, etc. The heating element 4 can be a heating sheet, a heating wire, and other components.

[0044] As an implementation mode, the heating control circuit 3 of this embodiment may include a main control unit, a temperature sensor, a charging and discharging circuit, a switch button, etc. The main control unit controls the on and off of the heating element 4 in combination with the switch button, and controls the heating temperature of the heating element 4 in combination with the temperature sensor to prevent the temperature from being too high or too low. The charging and discharging circuit manages the charging and discharging of the battery 2. It can be understood that the heating control circuit 3 of this embodiment can be provided with an external charging interface to supply power to the outside, such as supplying power to electronic products such as mobile phones, that is, the hand warmer 100a of this embodiment can be used for heating and can also be used as a power bank.

[0045] The housing 1 of this embodiment can be made of metal or heat-resistant plastic. Figure 1 , Figure 2 The flat block shape in the figure may also be a cylindrical shape or other shapes. The size of the shell 1 should be convenient for human hand holding.

[0046] The heat conducting part 5 can be made of metal material with good thermal conductivity, such as aluminum, copper, iron, steel and the like. When the housing 1 is made of metal, the heat conducting part 5 can be a part of the housing 1. It can be understood that the heat conducting part 5 can also be a metal heat conducting sheet independently arranged on the outer surface of the housing 1. For example, in the first embodiment, the heat conducting part 5 is a metal aluminum sheet independently arranged on the outer surface of the housing 1.

[0047] The outer surface of the heat conducting part 5 of the hand warmer 100a of the present invention is provided with a soft rubber sleeve 6. The soft rubber sleeve 6 of this embodiment can be fixed on the outer surface of the heat conducting part 5 by gluing, buckling, pressing, covering, etc. The soft rubber sleeve 6 of the present invention fits the heat conducting part 5 tightly to fully conduct the heat of the heat conducting part 5, avoiding the problem of slow heat transfer caused by loose fitting.

[0048] Specifically, Figures 1 to 3 As shown, the soft rubber sleeve 6 of the first embodiment is a bag-like structure covering the shell 1 and the heat-conducting part 5, that is, the soft rubber sleeve 6 of the first embodiment covers the shell 1 and the heat-conducting part 5 on the surface of the shell 1, and the soft rubber sleeve 6 is covered on the outer surface of the shell 1 and the heat-conducting part 5 like a sleeve, so that the soft rubber sleeve 6 is closely arranged with the outer surface of the heat-conducting part 5, so that the heat on the heat-conducting part 5 can be well transferred. During use, the heat-conducting part 5 transfers the heat generated by the heating element 4 to the soft rubber sleeve 6 outside the heat-conducting part 5, and the hands and other parts of the human body touch the soft rubber sleeve 6 for warmth.

[0049] The soft rubber sleeve 6 can be made of silicone, rubber, PVC and other materials. Preferably, the material of the soft rubber sleeve 6 of the first embodiment is silicone, which has good touch and heat resistance. Since the soft rubber sleeve 6 is arranged outside the heat conducting part 5 of the first embodiment, the hand warmer 100a of the first embodiment can prevent the metal heat conducting part 5 from being scratched and scratched, and protect the heat conducting part 5.

[0050] On the other hand, the soft rubber cover 6 is made of soft material and feels comfortable. Compared with the heat-conducting part made of hard material in the prior art, when the user holds the soft rubber cover 6 during use of the hand warmer 100a of this embodiment, the user's skin feels more comfortable. At the same time, the heat conducted by the soft rubber cover 6 makes the user's temperature experience during heating softer, thereby improving the user's usage experience.

[0051] On the other hand, the material properties of the soft rubber cover 6 make the heat dissipation efficiency of the soft rubber cover 6 lower than that of the heat conducting part 5. In this way, the soft rubber cover 6 of this embodiment effectively blocks the direct contact between the heat conducting part 5 and the air. Compared with the prior art in which the heat conducting part 5 is directly exposed to the air, the soft rubber cover 6 of this embodiment slows down the heat dissipation speed of the hand warmer 100a and slows down the heat loss speed. In this way, the battery 2 of the hand warmer 100a of this embodiment can meet the total heat required for both heating and heat loss of the user by using a lower output power than the prior art. In this way, the soft rubber cover 6 of this embodiment can effectively extend the battery life of the battery 2 of the hand warmer 100a.

[0052] On the other hand, Figure 1 and Figure 2As shown, the heat conducting part 5 is arranged on the front surface of the shell 1 or on the front and rear surfaces of the shell 1. If there is no soft cover 6 outside the shell 1 and the heat conducting part 5 as in the prior art, the temperature of the hand warmer when working is mainly concentrated on the front and rear sides of the shell 1, while the temperature on the left and right sides of the shell 1 is very low. When the user holds the hand warmer to keep warm, the hand can hardly feel the temperature on the left and right sides of the shell 1. In this way, the hand feels uneven temperature on the front and rear and left and right sides of the shell 1, resulting in poor heating effect. In this embodiment, after the soft cover 6 with a bag-like structure is arranged outside the shell 1, it is equivalent to the soft cover 6 surrounding and covering the front and rear surfaces and left and right side walls of the shell 1. Due to the heat-conducting effect of the soft rubber sleeve 6, the part where the soft rubber sleeve 6 is in contact with the left and right sides of the shell 1 will also transfer heat through the soft rubber sleeve 6, making the front, back, left and right heat of the soft rubber sleeve 6 relatively balanced. That is, after the soft rubber sleeve 6 made of silicone material in this example is mounted on the outside of the shell 1, the silicone can transfer heat to all the silicone surfaces in the front, back, left and right directions, thereby increasing the heating area and providing a better user experience. In this way, after the user holds the hand warmer 100a of this embodiment, the temperature of each contact position between the hand and the soft rubber sleeve 6 is relatively balanced, and the user's hand can experience a surround-type warmth sensation. There is no situation in the prior art where the temperature of the front and back of the hand warmer is high, and the temperature of the left and right sides is low or there is no temperature.

[0053] Furthermore, the material of the soft rubber sleeve 6 of the first embodiment is thermally conductive silicone containing thermally conductive powder. Thermally conductive silicone has higher thermal conductivity than ordinary silicone and can heat up quickly, so that even if the heat conducting part 5 is blocked and covered by the soft rubber sleeve 6, the soft rubber sleeve 6 can quickly conduct the heat on the heat conducting part 5, so that the soft rubber sleeve 6 can also quickly heat up in a short time to reach the heating temperature required by the user, without having to wait for a long time to affect the user's experience.

[0054] Thermal conductive silicone is made by mixing thermal conductive powder into organic silicone during the production process and then finally forming it. It can improve the thermal conductivity of the product. Commonly used thermal conductive powders include metal oxides and metal nitrides, such as aluminum oxide, magnesium oxide, aluminum nitride, boron nitride, etc.

[0055] like Figure 2 and Figure 3 As shown, in embodiment one, the shell 1 includes a first shell 11 and a second shell 12 that are matched and connected, and a hook portion 61 is provided at the edge of the soft rubber sleeve 6, and the inner wall 601 of the hook portion 61 is buckled on the first shell 11, and the outer wall 602 of the hook portion 61 is crimped by the second shell 12.

[0056] In the first embodiment, Figure 4As shown, the first shell 11 of the hand warmer 100a includes a first front shell 111 and a first rear shell 112. The first front shell 111 and the first rear shell 112 are snap-fitted to form a storage cavity for storing the battery 2 and the heating control circuit 3. The front side of the first front shell 111 is provided with an installation window 102, and the rear side of the first rear shell 111 is also provided with an installation window 102. The two installation windows 102 are respectively used to install two sets of heating elements 4 and heat-conducting elements 5, that is, the front and rear surfaces of the shell 1 of the hand warmer 100a of the first embodiment are respectively provided with a heat-conducting element 5 for conducting heat from the front and rear surfaces. In the installation window 102, the heat-conducting element 5 is pressed on the heating element 4 in the installation window 102 and snap-fitted with the first front shell 111 or the first rear shell 112, so that the heat-conducting element 5 can be pressed against the outer surface of the heating element 4 to conduct heat well.

[0057] like Figure 4 As shown in FIG. 1 , the heating control circuit 3 is provided with an interface 7 and a switch 9, and the interface 7 can be connected to an external power source to charge the battery 2, or the interface 7 can be connected to an external electronic device such as a mobile phone to charge the electronic device. The switch 9 controls the on and off of the hand warmer 100a.

[0058] Preferably, the heating element 4 of this embodiment is a sheet of bendable material, so that it can be installed on the installation window 102 of the housing 1 .

[0059] Furthermore, the heating element 4 of this embodiment is a PI flexible electric heating film. The PI electric heating film is made of polyimide film as an outer insulator and metal foil and metal wire as an inner conductive heating element, which are heat-sealed at high temperature and high pressure. The PI flexible electric heating film can adapt to bending, has good insulation, and has high heating efficiency.

[0060] The second shell 12 of this embodiment is a pressing cover covering the upper ends of the first front shell 111 and the first rear shell 112, and is used to press the hook 61 of the soft rubber sleeve 6 to prevent the soft rubber sleeve 6 from loosening or falling off after being put on the shell 1.

[0061] The bag-shaped soft rubber sleeve 6 of this embodiment has a storage cavity 62. Figure 3 As shown in , the soft rubber sleeve 6 is provided with an installation opening 63 connected to the storage cavity 62. The installation opening 63 is used to install the first shell 11 of the hand warmer 100a into the storage cavity 62 of the soft rubber sleeve 6, so that the soft rubber sleeve 6 covers the first shell 11 and the heating part 5 on the front and rear sides of the first shell 11.

[0062] In this embodiment, Figure 2 , 3As shown, the soft rubber sleeve 6 is in the shape of a bag with closed bottoms at the front, back, left, and right sides and an open top, and the top opening is the installation opening 63. The hook portion 61 is arranged on the front and back side walls of the installation opening 63. When installing, the soft rubber sleeve 6 is inserted from the bottom of the first shell 11, and then the hook portion 61 of the soft rubber sleeve 6 is pressed tightly when the second shell 12 is buckled onto the upper end of the first shell 11.

[0063] Specifically, refer to Figures 5 to 7 As shown, the soft rubber sleeve 6 of this embodiment extends outward from the position of the installation opening 63 and is provided with an L-shaped hook portion 61, and the housing 1 is provided with a slot 101 for accommodating the L-shaped hook portion 61. In this embodiment, the first front housing 111 and the first rear housing 112 are both provided with a slot 101, as shown in FIG. Figure 6 As shown in the figure, the inner wall 601 of the hook portion 61 is buckled in the slot 101 of the first front housing 111. After the inner wall 601 of the hook portion 61 is buckled in the slot 101 of the first front housing 111, the entire soft rubber sleeve 6 can be tightened, so that the soft rubber sleeve 6 fits tightly with the housing and the heat conducting part 5. The outer wall 602 of the hook portion 61 is pressed by the second housing 12, so that the entire soft rubber sleeve 6 is firmly fixed to the housing 1 and will not fall off.

[0064] In this embodiment, the L-shaped hook portion 61 includes a first hook arm 611 and a second hook arm 612 connected to the first hook arm 611 in an L shape. The first hook arm 611 enables the hook portion 61 to be stuck in the slot 101, and the second hook arm 612 extends toward the second shell 12, so that the second shell 12 can press and cover the second hook arm 612.

[0065] Preferably, if Figure 7 As shown, the height h and width w of the storage cavity 62 of the present embodiment are 0.1 to 0.13 mm smaller than the height and width of the shell 1, preferably 0.1 mm. This allows the shell 1 to be smoothly loaded into the soft rubber sleeve 6 on the one hand, and on the other hand, the elastic deformation of the soft rubber sleeve 6 can tightly wrap the shell 1 and the heat conducting part 5, which fits tightly and is conducive to heat conduction.

[0066] Preferably, if Figure 1 As shown in FIG7 , the outer surface of the soft rubber cover 6 of this embodiment is provided with anti-skid patterns 64. The anti-skid patterns 64 provide an anti-skid effect when the user holds the hand warmer 100a, preventing the hand warmer from slipping and falling.

[0067] The outer surface of the soft rubber sleeve 6 of this embodiment is also provided with a button portion 65, and a pressing block 103 is also provided at the corresponding position of the shell 1. The inner surface of the pressing block 103 can abut against the switch 9, and the outer surface of the pressing block 103 is covered by the button portion 65. In this way, the pressing block 103 on the shell 1 cannot be seen from the appearance, which is beneficial to the aesthetics.

[0068] Preferably, the pressing block 103 on the shell 1 of this embodiment is a hollow pressing block integrally formed with the shell 1, and the hollow pressing block has the function of elastic reset, that is, after being pressed and the external force is released, it can automatically return to its original position.

[0069] The thickness of the soft rubber cover 6 of this embodiment is 0.8-1.2 mm, preferably 1 mm, which can ensure the strength of the soft rubber cover 6 while achieving a light and thin effect and ensuring a comfortable touch.

[0070] Preferably, the housing 1 of the first embodiment is also exposed with an LED light 8, which is electrically connected to the heating control circuit 3, and is used to display the working state or the charging and discharging state.

[0071] Example 2, please refer to Figures 8 to 12 This embodiment also provides a hand warmer 100b, which is different from the hand warmer 100a of the first embodiment in that the soft rubber cover 6 of the second embodiment is a sheet structure that completely covers the heat conducting part 5, that is, the soft rubber cover 6 of the second embodiment is only a sheet structure that covers the heat conducting part 5, but does not wrap the shell 1. This can be suitable for a hand warmer structure with only single-sided heating, such as a hand warmer with a heat conducting part 5 only on the front surface or only on the rear surface. For example, the hand warmer 100b in the second embodiment has a heat conducting part 5 only on the front surface of the shell 1, and no heat conducting part 5 on the rear surface of the shell 1.

[0072] The single-sided heating hand warmer 100b of the second embodiment can be combined with two such structures to form a hand warmer set for warming both hands at the same time, that is, two such structures can be combined with two such structures to form a hand warmer set for warming both hands at the same time. Figure 8 The hand warmer 100b shown is combined into a set by magnetic attraction, plug-in connection, snap-in connection, etc., and can be disassembled to warm the left and right hands of the user. That is, the soft rubber sleeve 6 of the utility model can be used on a single hand warmer or on a set of two hand warmers.

[0073] The second embodiment also differs from the first embodiment in the following ways:

[0074] like Fig. 9 and Fig.10 As shown, the first shell 11 of the second embodiment is the front shell, and the second shell 12 is the rear shell. The front shell and the rear shell are snap-fitted together. The storage cavity after the front shell and the rear shell are snap-fitted together stores the battery 2 and the heating control circuit 3, that is, the shell 1 of the second embodiment has no pressure cover.

[0075] like Fig.11 and Fig.12 As shown, the hook portion 61 of the soft rubber sleeve 6 of the second embodiment is circumferentially arranged at the edge of the sheet structure, and the hook portion 61 is in an L-shape bent inward, as shown in FIG. Fig.12As shown in , the second hook arm 612 of the L-shaped hook portion 61 is embedded in the slot 101 of the first shell 11 and buckled on the first shell 11 , and the first hook arm 611 of the L-shaped hook portion 61 is pressed by the second shell 12 .

[0076] Since the soft rubber cover 6 is also provided on the outer side of the heat conducting part 5 of the hand warmer 100b of the second embodiment, the hand warmer 100b of the second embodiment also has the beneficial effects of the hand warmer 100a of the first embodiment, such as preventing the heat conducting part 5 from being scratched, improving the touch, slowing down the speed of heat loss and extending the battery life of the hand warmer 100b.

[0077] The above description is only an example to clearly illustrate the present invention, and does not limit the patent scope of the present invention. It is impossible to list all implementation methods here. All equivalent structural changes made by using the contents of the technical solution of the present invention under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A hand warmer, comprising a housing, a battery, a heating control circuit electrically connected to the battery, and a heating element electrically connected to the heating control circuit, wherein the outer surface of the housing has a heat conducting portion, and the heat conducting portion is used to conduct heat generated by the heating element, and is characterized in that: The outer surface of the heat conducting part is provided with a soft rubber sleeve.

2. The hand warmer according to claim 1, characterized in that: The material of the soft rubber sleeve is thermally conductive silicone.

3. The hand warmer according to claim 1, characterized in that: The shell comprises a first shell and a second shell that are matched and connected. A hook is provided at the edge of the soft rubber sleeve. The inner wall of the hook is buckled on the first shell, and the outer wall of the hook is crimped by the second shell.

4. The hand warmer according to claim 1, characterized in that: The soft rubber sleeve is a sheet-like structure that completely covers the heat-conducting part.

5. The hand warmer according to claim 1, characterized in that: The soft rubber sleeve is a bag-shaped structure that covers the shell and the heat-conducting part.

6. The hand warmer according to claim 5, characterized in that: The soft rubber sleeve has a storage cavity, and the height and width of the storage cavity are both 0.1 to 0.13 mm smaller than the height and width of the shell.

7. The hand warmer according to claim 6, characterized in that: The soft rubber sleeve is provided with a mounting opening communicated with the storage cavity.

8. The hand warmer according to claim 7, characterized in that: The soft rubber sleeve is provided with an L-shaped hook portion extending outward from the position of the installation opening, and the shell is provided with a slot for accommodating the L-shaped hook portion.

9. The hand warmer according to claim 1, characterized in that: The thickness of the soft rubber sleeve is 0.8-1.2 mm.

10. The hand warmer according to claim 1, characterized in that: The outer surface of the soft rubber sleeve is provided with anti-slip patterns.

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