There are many small items for heating and keeping warm in winter, and the hand warmer is the most common one. Hand warmers are very popular because of their novel and unique advantages such as automatic heat generation, fun and practicality. There are many brands of hand warmers currently on sale, including low-end products produced by small factories and brand-name products produced by regular large factories. Some inferior hand warmers have potential safety hazards, so what kind of hand warmers are more Safety? Below I will introduce the types and principles of hand warmers in detail, as well as the safe use of hand warmers and other related content. Let’s take a look at the hand warmer knowledge encyclopedia. Types and principles of hand warmers The principle of hard solid hand warmers
Also known as electric heating cakes, it is filled with thermal insulation cotton, and adopts a dual-temperature-controlled electric heating energy storage structure, which is gradually released. thermal energy. It is equipped with automatic overheating protection device and automatic heat preservation indicating device, and a small electric furnace controlled by PTC thermistor switch.
The principle of soft liquid hand warmer
Soft liquid hand warmer has two types: electrode type and electric heating element type, which are improved on the basis of solid electric heating cake. Since the electrode type electric heater is directly exposed to the water due to the two electrodes, the risk of electric leakage is very high, and it has been disabled. The electric heating element type hand warmer has a furnace wire as a resistance, which is composed of a bag of liquid and two metal sheets. The liquid in the hand warmer is a supersaturated solution. Gently bend the metal sheet in the bag. The slight vibration generated when bending the metal sheet will cause the solute to crystallize, and the crystallization process will release heat, thus achieving the purpose of heating.
The principle of battery-type hand warmer
The battery-type hand warmer is powered by built-in lithium battery or AA battery, and uses the principle of resistance to generate heat to warm hands. The heating method is not restricted by the mains power supply heating, especially suitable for going out.
What liquid is in the hand warmer
1. The first one is supersaturated solution sodium acetate (CH3COONa), which is supersaturated solution, which is non-toxic under normal use. Because the concentration of supersaturated solution is too high, it is not stable. It is also irritating to the skin and eyes, so please stop using it when the hand warmer leaks.
2. The second is normal water (H?O), which will automatically power off when it is heated to 65 degrees when plugged in. It is also commonly known as a hot water bottle. It heats up by heating water, so the water inside is non-toxic.
Can the water in the hand warmer be changed? The water in the hand warmer cannot be changed, because some hand warmers are not filled with water, but saturated sodium acetate. After changing the water, the sodium acetate in the hand warmer will be lost. And the hand warmer cannot be heated. However, the hand warmer can generally be filled with water. After the water is filled, the sodium acetate will continue to play the corresponding function. However, there is less water for hand warmers. I recommend that you stop using them for safety reasons, because less water in electric hand warmers not only shortens the warm-up time, but also burns out the internal structure.
Which is better between electric heating cake and electric hot water bottle? Solid electric heating cake
What is : It is a small hand warmer that is charged with usb, ub hand warmer The advantage is the use of lithium batteries, large capacity, more environmentally friendly, and recyclable; small and cute shape, easy to carry; and can be charged with various digital products, which is very convenient, just connect to the ordinary usb interface to charge when using.
Advantages: Long heat preservation time, large heat output and small size.
Disadvantages: The surface temperature is too hot and it is easy to burn people.
Electric hot water bottle
What is : Plug-in heating, using high-energy-storage hydrothermal fluid as the heating medium, no sudden Forehead high temperature point, soft and gentle touch and precise temperature control device, safe and convenient, is an upgraded product of traditional hot water bottle. Generally, it takes 8 to 10 minutes to release each charge, warm hands for about 2 hours, and warm the bed for 10 hours.
Advantages: It heats up quickly and has many styles.
Disadvantages:It can explode if used incorrectly.
Summary
The electric heating cake is heated by electric heating wire, filled with heat storage material and fiber cotton for insulation. The heat preservation time is long, but it cannot completely cut the circuit when heating. It is best not to leave the person when charging, and after heating, the temperature of the electric heating cake is high. In order to avoid burns, it must be covered with a flannel bag. Therefore, it is best not to use it for the elderly and children to avoid burns.
The electric hot water bottle is heated by electric heating tube or electric heating wire, which is filled with liquid. It heats up quickly and can be used directly without water injection, but compared to electric heating cakes, the heat preservation is not so long and the service life is shorter. Due to the variety of styles, it can be directly taken out of the street, suitable for everyone, especially girls.
How to choose a hand warmer
1. Brand: There are many brands of hand warmer currently on sale, including low-end products produced by small factories and regular large factories Produced brand-name products. It is recommended to purchase brand-name products that have been certified by regular manufacturers as much as possible to ensure the safety of users.
2. Appearance: Attention should be paid to whether the appearance of the electric heating cake has any signs of damage after being bumped, and also pay attention to whether the hand warmer is fine in workmanship and whether the seams are uniform and meticulous. , No scratches and burrs. When purchasing a hand warmer, be sure to carefully check the integrity of the circuit part of the hand warmer.
3. Safety: Be sure to check the safety of the product. Pay attention to whether the hand warmer is made of high-quality refractory insulation materials, and whether it uses high-quality brand-name electric furnace wire. These are all links that are closely related to the safety of the use of hand warmers, and you must not ignore them.
4. Packaging: When buying an electric hot water bottle, it is best to look at the outer packaging and related instructions of the product. Some are directly marked as electrode type or electric heating wire type. Some are not marked, do not buy some products that do not even have the place of manufacture and instructions.
5. Touch: Touch the heating element with your hand. If you feel that there are two metal rods in it, you can basically judge it as an electrode hand warmer. Buy. If you feel that there is a large plastic coil or U-shaped, arc-shaped tube in the bag, it is an electric heating wire type hand warmer.
How to use the hand warmer
1. Do not use it when charging, and place it flat. At the same time, do not place the electric hand warmer on fabrics and heat-resistant materials. to avoid accidents during charging and heating.
2. The power supply device must be used together. After charging and heating, the power supply should be cut off in time. At the same time, do not squeeze the electric hot water bottle forcefully to avoid damage.
3. After charging, the temperature is relatively high, so do not use it for children immediately to avoid burns. And infants, the elderly are best not to use electric hot water bottle.
How to exhaust the charging hand warmer? Shake the exhaust with your hands
If the hand warmer is just plugged in for a few minutes when charging the hand warmer, the electric hand warmer is full and full, indicating that there is something in the bag. For the remaining air, at this time, the easiest solution is to shake the electric hand warmer directly, so that the gas will be discharged quickly, and the hand warmer will return to flat.
Exhaust vent
If the hand warmer is filled with water, a small vent will be reserved on it, usually near the place where it is plugged in. When deflating, put it flat on the table, and press the hand warmer with the palm of your hand. Don’t just press on one side, and you can’t squeeze it with your fingers. Don’t press too hard, or it will break.
Exhaust from heavy objects
When the hand warmer is charging and heating, press something on the hand warmer, the weight is preferably between 500 grams and 700 grams, which can directly reduce the occurrence of gas, and also help Gas exhaust. Some electric hand warmers are directly equipped with clips, which are not only explosion-proof, but also conducive to exhaust. This method carries certain risks and is not recommended.
Are hand warmers safe?
The quality of hand warmers on the market is uneven, and there are potential safety hazards. There are 3 major hidden dangers in the hand warmer:
First, the label description is not standardized, such as no nameplate information on the product, full English nameplate, incomplete information, etc.;
Second, The effective output capacity at room temperature is not up to the standard, usually the actual corresponding rated capacity is far less than the marked capacity;
The third is that the free drop test fails. In daily carrying or use, the rechargeable hand warmer will inevitably fall. Once the casing is broken after the impact, the battery and the circuit will be exposed, and it is easy to cause a short circuit, the battery is squeezed, etc., which will cause the battery to catch fire and explode.
In addition, in the national standard “Special Requirements for Safe Thermal Storage Electric Hand Warmers for Household and Similar Electrical Appliances” promulgated in 2005, the electrode type warm water bags have been banned from being sold, and they are allowed to continue to be sold. It is a high-safety electric heating wire-type warm water bag.
Therefore, I remind everyone that when choosing an electric hand warmer, you should choose carefully, pay attention to the safety of the product, check the trademark and nameplate, and choose products marked with regular manufacturers and registered trademarks. Information products should not be purchased.
Note on using the hand warmer
1. Ensure the quality is up to standard: In the process of using the hand warmer, be sure to Pay more attention to quality issues, so that you can use it more safely.
2. Pay more attention to the safety of electricity consumption: It is very common to use the hand warmer frequently in winter. When heating the hand warmer, the required electricity is still relatively large. Therefore, other appliances should be used sparingly at the same time.
3. Prevent skin burns: Do not use the hand warmer immediately after heating, otherwise it will easily burn the skin. In addition, try not to use the hand warmer at night, because the body is the same Contact for too long can lead to low temperature burns. Now there are many kinds of hand warmers on the market, you can choose one for your rechargeable hand warmer, which can not only insulate heat to avoid overheating, but also ensure the appearance of the rechargeable hand warmer.
4. Daily care: Because of the electric principle inside the electric hand warmer, it cannot be cleaned directly in many cases. If the outer part is a ceramic electric heating cake, wipe it with a dry cloth. If there are substances that are difficult to clean or discoloration, you can wipe it with some cleaning agent, and then wipe it with a dry towel.
5. Check for water leakage: The electric hot water bottle is filled with water. If there is water leakage, it should be stopped immediately.
