A heater

Abstract

The utility model discloses a kind of heaters, the heater (1) includes heating main body (10), the heating main body (10) includes liquid inlet (11a), liquid outlet (11b) and heating element (12), the heating element is arranged in the heating main body, the liquid inlet (11a) and liquid outlet (11b) are respectively located at the two ends of the heating main body (10), the heater further includes first temperature controller (20a) and second temperature controller (20b), the first temperature controller (20a) and second temperature controller (20b) are all arranged on heating main body (10), the first temperature controller (20a) is used to control the heating element (12) open circuit in the temperature of the heating main body exceeds the case of first set value, the second temperature controller is used to control the liquid delivery device of liquid system to be heated to stop running in the temperature of the heating main body is lower than the case of second set value, and the first set value is greater than the second set value.

Description

Technical Field

[0001] This utility model relates to the field of heater technology, specifically to a heater. Background Technology

[0002] Some liquids have an optimal operating temperature range. To bring the liquid to its optimal operating temperature, a heater is usually used to heat the liquid.

[0003] A common type of heater is the cast aluminum heater. Liquid enters through an inlet pipe, and the heating element heats the aluminum substrate, which then conducts heat to the liquid pipe, thus heating the liquid. However, the heating effect of this heater is unstable during the heating process, preventing the liquid from reaching its optimal operating temperature.

[0004] How to control the heater to heat the liquid to the optimal operating temperature is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, this utility model provides a heater.

[0006] To achieve the above objectives, this utility model discloses a heater, which includes a heating body, an inlet pipe, an outlet pipe, and a heating element. The heating element is disposed within the heating body, and the inlet pipe and outlet pipe are located at opposite ends of the heating body. The heater also includes a first temperature controller and a second temperature controller, both of which are disposed on the heating body. The first temperature controller is used to control the heating element to open circuit when the temperature of the heating body exceeds a first set value, and the second temperature controller is used to control the liquid delivery device of the liquid system to be heated to stop operating when the temperature of the heating body is lower than a second set value. The first set value is greater than the second set value.

[0007] Furthermore, the distance between the first temperature controller and the liquid outlet is less than the distance between the second temperature controller and the liquid outlet;

[0008] The distance between the second temperature controller and the liquid inlet is less than the distance between the first temperature controller and the liquid inlet.

[0009] Furthermore, the first temperature controller has a first shutdown temperature and a first reset temperature, and the second temperature controller has a second shutdown temperature and a second reset temperature, wherein the second shutdown temperature is lower than the second reset temperature, the second reset temperature is lower than the first reset temperature, and the first reset temperature is lower than the first shutdown temperature.

[0010] Furthermore, the first temperature controller includes a first temperature control body and a first connection terminal. One end of the first connection terminal is fixedly connected to the first temperature control body, and the other end of the first connection terminal is electrically connected to the heating element by soldering to a connecting wire.

[0011] The second temperature controller includes a second temperature control body and a second connection terminal. One end of the second connection terminal is fixedly connected to the second temperature control body, and the other end of the second connection terminal is electrically connected to the liquid delivery device of the heating liquid system by welding to a connecting wire.

[0012] Furthermore, the first temperature controller includes a first protective sleeve, which is fitted onto the solder joint between the first connecting terminal and the corresponding connecting wire;

[0013] The second temperature controller includes a second protective sleeve, which is fitted onto the solder joint between the second connecting terminal and the corresponding connecting wire.

[0014] Furthermore, the heater also includes two heating electrodes disposed on the surface of the heating body, the liquid inlet is disposed between the two heating electrodes, and the heating electrodes and the heating element are electrically connected.

[0015] Furthermore, the heater also includes a fuse, which is disposed between the liquid outlet and the first temperature controller, and the first temperature controller, the heating element and the fuse are connected in series.

[0016] Furthermore, the heater also includes a fixing part, which is fixedly connected to the heating body. The fixing part is provided with a fixing groove, and the fuse is disposed in the fixing groove. The fuse is fixedly connected to the heating body through the fixing groove.

[0017] Furthermore, the surface of the heating body is provided with protruding mounting holes, and the first thermostat and the second thermostat are fixedly connected to the mounting holes by bolts.

[0018] Furthermore, the heater includes mounting feet, which are disposed opposite to each other on both sides of the heating body for fixing the heater.

[0019] The heater provided by this technical solution significantly improves the safety and reliability of the equipment by employing a dual-temperature controller design. Specifically, when the first temperature controller detects that the temperature of the heating element exceeds a set first threshold, it can quickly cut off the operating circuit of the heating element, effectively preventing safety hazards caused by overheating and damage to the heating element, thereby extending the service life of the heater. Simultaneously, the second temperature controller automatically stops the operation of the liquid delivery device of the liquid system being heated when it detects that the temperature of the heating element is below a set second threshold. This not only avoids system failures or efficiency reductions that may be caused by excessively low temperatures, but also ensures that the entire heating process is more efficient and stable. Furthermore, this design allows for flexible adjustment of the settings of the two temperature controllers according to actual needs, making the heater suitable for a wider range of scenarios and different operating conditions, exhibiting strong adaptability and practicality. In summary, this heater with intelligent temperature control function can improve energy efficiency while ensuring safety, meeting users' multiple needs for high efficiency, energy saving, and safety.

[0020] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1 A perspective view of one embodiment of the heater provided by this utility model;

[0023] Figure 2 This is a perspective view of one embodiment of the heater provided by this utility model;

[0024] Figure 3 This is a side view of one embodiment of the heater provided by this utility model;

[0025] Figure 4 This is a three-dimensional exploded view of one embodiment of the heater provided by this utility model; Explanation of reference numerals.

[0026] 1: Heater; 10: Heating body; 12: Heating element; 12a: Heating electrode; 13: Mounting hole; 14: Mounting foot; 11a: Liquid inlet; 11b: Liquid outlet;

[0027] 20a: First thermostat; 20b: Second thermostat; 21a: First protective sleeve; 21b: Second protective sleeve; 22a: First connecting terminal; 22b: Second connecting terminal; 30: Connecting wire;

[0028] 40: Fuse; 50: Fixing part; 51: Fixing plate; 52: Fixing groove. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0030] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0031] Currently, the main type of heater used is the cast aluminum heater, which is a heater formed by die-casting an electric heating element and aluminum metal together. The cast aluminum heater is made by inserting a tubular electric heating element and a stainless steel pipe into a mold together, and using high-quality aluminum metal as the outer shell to die-cast into a flat or cylindrical shape. It can fit tightly with the heated body. The heat source generated by the electric heating element is quickly conducted to the integral die-cast metal filler through the pipe wall, so that the temperature of the entire metal body is evenly distributed, reducing the temperature per unit area of ​​the heating element and reducing the heat load of the heating element. At the same time, it exchanges heat with all the liquid in the liquid channel to improve its thermal efficiency. Due to the accelerated heat source dispersion speed, while improving thermal efficiency, it also slows down the aging of the heater, controls the formation of liquid fouling, and extends its service life. It is a high-efficiency heater with uniform heat distribution. The aluminum alloy with excellent thermal conductivity ensures uniform temperature of the hot surface and eliminates the hot and cold spots of conventional heaters. On the other hand, compared with casting heaters, the die-cast heaters of this application have fewer defects such as porosity and inclusions due to the high-pressure filling. Furthermore, the metal grains formed by die casting are finer, which is beneficial to improving the strength and toughness of the product. Die casting can also achieve higher process precision and improve product quality.

[0032] On the other hand, the gap between the heating element and the liquid channel is filled with die-cast metal material, thus completely isolating the heating element and the surface of the liquid channel from the air and eliminating the possibility of surface oxidation. Preferably, the liquid channel is made of stainless steel in a single continuous loop, without joints, welds, or weld seams, completely eliminating the risk of leakage and corrosion caused by welding. Its structure completely prevents the liquid from coming into contact with the heating element, and even if the liquid channel or heating element ruptures, the heating device will not become damp or come into contact with the liquid, achieving true liquid-electric separation.

[0033] However, during the heating process, inaccurate temperature detection often leads to heaters heating the liquid above or below the set temperature, resulting in uneven heating and poor heating performance. This is especially true in the field of cleaning fluid heating, where the cleaning fluid in cleaning appliances typically needs to be heated quickly and promptly to its optimal operating temperature range for effective cleaning. However, conventional heaters, due to their unstable heating performance, often cause the cleaning fluid temperature to be too high or too low, failing to operate within the optimal range and resulting in poor cleaning performance. Therefore, designing and optimizing the heater's temperature detection structure to improve heating uniformity and thus enhance cleaning performance is a pressing issue in this field.

[0034] Therefore, this utility model discloses a heater 1, such as Figures 1 to 4 As shown, the heater 1 includes a heating body 10, which includes an inlet pipe 11a, an outlet pipe 11b, and a heating element 12. The heating element 12 is disposed inside the heating body 10. The inlet pipe 11a and the outlet pipe 11b are located at opposite ends of the heating body 10. The heater 1 also includes a first temperature controller 20a and a second temperature controller 20b, both of which are disposed on the heating body 10. The first temperature controller 20a is used to control the heating element 12 to open when the temperature of the heating body 10 exceeds a first set value. The second temperature controller 20b is used to control the liquid delivery device of the liquid system to be heated to stop operating when the temperature of the heating body 10 is lower than a second set value. The first set value is greater than the second set value.

[0035] The heater 1 provided by this technical solution significantly improves the safety and reliability of the equipment by adopting a dual-temperature controller design. Specifically, when the first temperature controller 20a detects that the temperature of the heating body 10 exceeds a set first threshold, it can quickly cut off the working circuit of the heating element 12, effectively preventing safety hazards caused by overheating and damage to the heating element 12, thereby extending the service life of the heater 1. At the same time, when the second temperature controller 20b detects that the temperature of the heating body 10 is lower than a set second threshold, it automatically stops the operation of the liquid delivery device of the liquid system to be heated. This not only avoids system failures or efficiency reductions that may be caused by excessively low temperatures, but also ensures that the entire heating process is more efficient and stable. In some embodiments, the heater is applied in cleaning appliances to heat cleaning fluid. The second temperature controller is connected to the power system controlling the cleaning fluid (e.g., a liquid pump). When the second temperature controller detects that the heater has not heated to a sufficient temperature or that the heating temperature is not up to standard, the power system for the cleaning fluid is opened, preventing the cleaning fluid from being delivered to the heater. This avoids the problem of insufficient heating of the cleaning fluid by the heater, resulting in low cleaning fluid temperature and poor cleaning effect. When the second temperature controller detects that the heater temperature has reached its recovery temperature, the power system circuit closes and reopens, allowing the cleaning fluid to continue to be pumped into the heater, so that the temperature of the cleaning fluid heated by the heater reaches a stable and optimal working temperature, thereby improving the cleaning effect.

[0036] Furthermore, this design allows for flexible adjustment of the settings of the two temperature controllers according to actual needs, making the heater 1 suitable for a wider range of scenarios and different operating conditions, demonstrating strong adaptability and practicality. In summary, this heater 1 with intelligent temperature control can improve energy efficiency while ensuring safety, meeting users' multiple needs for high efficiency, energy saving, and safety.

[0037] In addition, to avoid the two liquid interfaces from affecting each other and being difficult to distinguish, as an optional implementation, the liquid outlet 11b and the liquid inlet 11a are arranged opposite each other on both sides of the heating body 10. This makes the temperature transmission more uniform, the wiring arrangement more reasonable, and facilitates installation and maintenance.

[0038] This application does not impose any special limitation on the installation positions of the first temperature controller 20a and the second temperature controller 20b. As an optional implementation, the distance between the first temperature controller 20a and the liquid outlet 11b is less than the distance between the second temperature controller 20b and the liquid outlet 11b; the distance between the second temperature controller 20b and the liquid inlet 11a is less than the distance between the first temperature controller 20a and the liquid inlet 11a.

[0039] The first temperature controller 20a, being closer to the liquid outlet 11b, can more promptly and accurately reflect the actual temperature at the end of the heating body 10 (i.e., the end from which the liquid is about to flow out), thus more effectively preventing excessively high liquid outlet temperatures and ensuring that the output liquid temperature remains stable within a safe range. The second temperature controller 20b, being closer to the liquid inlet 11a, can more sensitively sense changes in the temperature of the cold-side liquid entering the heating body 10, helping to promptly stop the delivery device when the liquid temperature is too low, avoiding ineffective heating or unstable operation during system cold start-up, and further improving the representativeness and accuracy of temperature detection. Furthermore, since the two temperature controllers are respectively located at both ends of the heating body 10, monitoring temperature changes in the inlet and outlet areas respectively, the control system can react more quickly to abnormal temperature fluctuations, improving the dynamic response capability and stability of the overall temperature control system. A reasonable temperature controller layout helps to achieve more refined management of the internal heat field distribution of the heating body 10, avoiding localized overheating or underheating, thereby improving heating efficiency, reducing energy consumption, and extending equipment lifespan. The optimal arrangement of the two temperature controllers can respectively enhance the high-temperature protection and low-temperature protection functions, forming a complementary multi-safety mechanism, effectively preventing safety accidents caused by temperature runaway, and improving the operational reliability of the heater under complex operating conditions.

[0040] The first thermostat 20a has a first shut-off temperature and a first reset temperature, and the second thermostat 20b has a second shut-off temperature and a second reset temperature. The second shut-off temperature is lower than the second reset temperature, the second reset temperature is lower than the first reset temperature, and the first reset temperature is lower than the first shut-off temperature. As a heater for the cleaning appliance, in some embodiments, the first reset temperature is in the range of 55°C to 65°C, the first shut-off temperature is in the range of 75°C to 85°C, the second reset temperature is in the range of 45°C to 55°C, and the second shut-off temperature is in the range of 25°C to 35°C. This allows the heater to heat the cleaning fluid while maintaining the temperature between the second shut-off temperature and the first shut-off temperature, resulting in a more stable and uniform heating temperature for the cleaning fluid.

[0041] The first temperature controller 20a includes a first temperature control body and a first connecting terminal 22a. One end of the first connecting terminal 22a is fixedly connected to the first temperature control body, and the other end of the first connecting terminal 22a is electrically connected to the heating element 12 by soldering to a corresponding connecting wire 30. The second temperature controller 20b includes a second temperature control body and a second connecting terminal 22b. One end of the second connecting terminal 22b is fixedly connected to the second temperature control body, and the other end of the second connecting terminal 22b is electrically connected to the liquid delivery device of the heating liquid system by soldering to a corresponding connecting wire 30. As an optional embodiment, such as... Figure 1 and Figure 2As shown, the connecting wire 30 in this application is connected to the first connecting terminal 22a and the second connecting terminal 22b by spot welding. Specifically, the connecting wire 30 includes a metal connecting part, a metal wire, and an insulating protective sheath. The metal wire is wrapped inside the insulating protective sheath. The metal connecting part is disposed at the end of the connecting wire 30 and is electrically connected to the metal wire. The metal connecting part has a molten solder joint on the surface of the first connecting terminal 22a or the second connecting terminal 22b to weld and fix the connecting wire 30 to the first connecting terminal 22a or the second connecting terminal 22b. The advantages of this spot welding are that the heating time of the connection area is very short, the welding speed is fast, it only consumes electrical energy, and there is no need for filling other materials. The metal connection part can be used as a spot welding material to weld and fix the wires, and at the connection point, the unwelded metal connection part can also be used to tightly fix the insulation protection. Spot welding can form a strong and durable joint, and the weld point is uniform in all positions, so the transmitted current is also more uniform, which helps heat dissipation. Spot welding can prevent the connecting wire 30 and the terminal from deforming or warping, and the heat-affected zone is smaller. More importantly, welding can generate a large current on the surface of the connecting terminal. This current can remove the micro oxide layer on the surface of the terminal, so that the contact point formed by the connection between the connecting wire and the terminal is cleaner, making the electrical connection of the temperature controller faster and shortening the response time. The heater provided in this application achieves efficient, safe, and reliable heating through optimized design. The connecting wire 30 is welded to the connecting terminal, forming a high-strength fixed connection between the connecting wire 30 and the connecting terminal. This ensures the reliability and stability of electrical contact and avoids poor contact and overheating problems caused by vibration or other external forces. Furthermore, the high-quality welding process increases the contact area, reduces contact resistance, lowers energy loss, and improves the overall energy efficiency ratio of the circuit. The robust welding connection not only enhances electrical performance but also improves system safety, reducing the risk of short circuits or fires caused by poor contact.

[0042] As an optional implementation, the first thermostat 20a includes a first protective sleeve 21a, which is fitted onto the solder joint between the first connecting terminal 22a and the corresponding connecting wire 30; the second thermostat 20b includes a second protective sleeve 21b, which is fitted onto the solder joint between the second connecting terminal 22b and the corresponding connecting wire 30. The first protective sleeve 21a and the second protective sleeve 21b can further increase the stability of the connection between the connecting terminal and the connecting wire 30, and at the same time, they can effectively insulate the temperature, prevent the connection from overheating, thereby reducing the contact resistance, reducing the power consumption and cost of the heater, and improving safety.

[0043] The heater 1 also includes two heating electrodes 12a disposed on the surface of the heating body 10, with an inlet 11a disposed between the two heating electrodes 12a. The heating electrodes 12a and the heating element 12 are electrically connected. In some embodiments, the heating electrodes 12a of the heating element 12 are divided into positive and negative electrodes, and the first temperature controller 20a generally also has at least two first connection terminals 22a. As an optional implementation, any one of the first connection terminals 22a of the first temperature controller 20a can be electrically connected to any one of the heating electrodes 12a through a corresponding connecting wire 30, thereby achieving a series electrical connection. In other embodiments, since the heating electrode 12a is connected to a wire, the temperature should not be too high, otherwise the wire will overheat severely, resulting in a large contact resistance and reducing the electric heating effect. Preferably, such as Figure 1 and Figure 2 As shown, the liquid inlet 11a is placed between the two heating electrodes 12a. The liquid inlet 11a is used to introduce the liquid to be heated. The initial temperature is relatively low, and the temperature of its surrounding environment is also relatively low, which is conducive to the wire transmitting current to the electrode to heat the heating element and prevent the electrode temperature from being too high.

[0044] From the design of the heating body 10 to the arrangement of the temperature controllers, and the fixed connection of the terminals and wires, every setting and combination optimizes the overall performance of the heater. The temperature controllers, positioned at different locations on the surface of the heating body, can detect the highest and lowest temperatures of the entire heater, achieving precise temperature monitoring and ensuring temperature stability and safety. The welding of the terminals and wires ensures the reliability of the electrical system. Through a rational layout of the temperature controllers and the use of high-quality welding processes, the safety of the heater is significantly improved. Real-time monitoring by the temperature controllers prevents overheating and overcooling, while robust electrical connections avoid safety hazards caused by poor contact, extending the heater's service life. Even under prolonged high-load operation, it maintains good working condition, reducing the frequency of maintenance and replacement. Optimized structure extends product life, and the heater also boasts high efficiency, safety, and multifunctionality. This heater not only possesses excellent heating performance and temperature control capabilities but also significantly improves its reliability and safety in practical applications through a rational structural design and high-quality connection processes.

[0045] In the event of a thermostat failure and inability to cut off power in time, as an optional implementation method to prevent the risk of high-temperature fire caused by such failure, such as... Figure 1 and Figure 2As shown, the heater 1 also includes a fuse 40, which is disposed on the surface of the heating body 10 and between the liquid outlet 11b and the first temperature controller 20a. The first temperature controller 20a, the heating element 12 and the fuse 40 are connected in series, so that when the first temperature controller fails, the fuse can detect that the temperature exceeds the upper limit and cut off the circuit itself to prevent the risk of high temperature and provide double protection.

[0046] The fuse 40 has a low melting point metal as its molten element, which is characterized by its low melting point and easy arc extinguishing. It is generally used in series with the first temperature controller 20a in the circuit. When the first temperature controller 20a fails, or when an overload or short circuit current passes through the molten element, it heats up and melts, thereby cutting off the power and providing double protection for the heater.

[0047] The fuse 40 is generally a section of cable wrapped in insulating rubber, with a fusible metal in the middle of the cable. To secure the fuse 40 and to place it close to the first temperature controller 20a for timely temperature detection, this is one possible implementation method. Figure 1 and Figure 4 As shown, the heater 1 also includes a fixing part 50, which is fixedly connected to the heating body 10. The fixing part 50 is provided with a fixing groove 52, which is formed by a fixing plate 51 and a fixing base. The fuse 40 is disposed in the fixing groove and is fixedly connected to the heating body 10 through the fixing groove.

[0048] In order to fix the thermostat to the surface of the heating element and to sensitively detect the temperature, such as Figure 2 and Figure 4 As shown, preferably, the surface of the heating body 10 is provided with protruding mounting holes 13, and the first thermostat 20a and the second thermostat 20b can be fixedly connected to the mounting holes 13 by bolts.

[0049] The heater described in this application is suitable for installation in any electric heater system. For easy assembly, such as... Figure 1 and Figure 2 As shown, preferably, the heater 1 includes mounting feet 14, which are disposed opposite to each other on both sides of the heating body 10, so as to securely install the heater 1 in the subsequent system.

[0050] This application does not specifically limit the type of thermostat. Preferably, the thermostat includes at least one of the following: snap-action thermostat, liquid expansion thermostat, electronic thermostat, and digital thermostat.

[0051] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A heater, the heater (1) comprising a heating body (10), the heating body (10) comprising an inlet pipe (11a), an outlet pipe (11b) and a heating element (12), the heating element being disposed within the heating body, characterized in that, The inlet (11a) and outlet (11b) are located at both ends of the heating body (10). The heater also includes a first temperature controller (20a) and a second temperature controller (20b). The first temperature controller (20a) and the second temperature controller (20b) are both installed on the heating body (10). The first temperature controller (20a) is used to control the heating element (12) to open the circuit when the temperature of the heating body exceeds a first set value. The second temperature controller is used to control the liquid delivery device of the liquid system to be heated to stop operating when the temperature of the heating body is lower than a second set value. The first set value is greater than the second set value.

2. The heater according to claim 1, characterized in that, The distance between the first temperature controller (20a) and the liquid outlet (11b) is less than the distance between the second temperature controller (20b) and the liquid outlet (11b); The distance between the second temperature controller (20b) and the liquid inlet (11a) is less than the distance between the first temperature controller (20a) and the liquid inlet (11a).

3. The heater according to claim 2, characterized in that, The first temperature controller (20a) has a first shut-off temperature and a first reset temperature, and the second temperature controller (20b) has a second shut-off temperature and a second reset temperature, wherein the second shut-off temperature is less than the second reset temperature, the second reset temperature is less than the first reset temperature, and the first reset temperature is less than the first shut-off temperature.

4. The heater according to claim 1, characterized in that, The first temperature controller (20a) includes a first temperature control body and a first connection terminal (22a). One end of the first connection terminal is fixedly connected to the first temperature control body, and the other end of the first connection terminal is electrically connected to the heating element by soldering to a connecting wire. The second temperature controller (20b) includes a second temperature control body and a second connection terminal (22b). One end of the second connection terminal is fixedly connected to the second temperature control body, and the other end of the second connection terminal is electrically connected to the liquid delivery device of the heating liquid system by welding to a connecting wire.

5. The heater according to claim 4, characterized in that, The first temperature controller (20a) includes a first protective sleeve (21a), which is fitted onto the solder joint between the first connecting terminal (22a) and the corresponding connecting wire (30); The second temperature controller (20b) includes a second protective sleeve (21b), which is fitted onto the solder joint between the second connecting terminal (22b) and the corresponding connecting wire (30).

6. The heater according to claim 1, characterized in that, The heater also includes two heating electrodes (12a) disposed on the surface of the heating body (10), the liquid inlet (11a) is disposed between the two heating electrodes (12a), and the heating electrodes and the heating element are electrically connected.

7. The heater according to claim 1, characterized in that, The heater (1) also includes a fuse (40), which is disposed between the liquid outlet (11b) and the first temperature controller (20a). The first temperature controller (20a), the heating element (12) and the fuse (40) are connected in series.

8. The heater according to claim 7, characterized in that, The heater (1) further includes a fixing part (50), which is fixedly connected to the heating body (10). The fixing part (50) is provided with a fixing groove, and the fuse (40) is disposed in the fixing groove. The fuse (40) is fixedly connected to the heating body (10) through the fixing groove.

9. The heater according to any one of claims 1 to 8, characterized in that, The surface of the heating body (10) is provided with protruding mounting holes, and the first thermostat (20a) and the second thermostat (20b) are fixedly connected to the mounting holes by bolts.

10. The heater according to any one of claims 1 to 8, characterized in that, The heater includes mounting feet (14) which are disposed opposite to each other on both sides of the heating body (10) for fixing the heater.

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