Electric heater with temperature limiting protection function

Abstract

The present invention provides an electric heater with a temperature limiting protection function. The electric heater includes a shell and a temperature limiter, wherein an electric control cavity and a hot runner are formed in the shell, a heating element is arranged in the hot runner, a connecting port is arranged between the electric control cavity and the hot runner, the temperature limiter is arranged in the electric control cavity, and the temperature sensing surface of the temperature limiter is directed to the hot runner through the connecting port. The electric heater with a temperature limiting protection function provided by the present invention is provided with a temperature limiter to control the problem inside the electric heater, and the connecting port can directly guide the hot air to the temperature limiter when the air outlet is blocked, so as to ensure the timely response of the temperature limiter, and the temperature limiter is sealed inside the electrical box, so as to increase the waterproof performance, and the heat dissipation port can discharge the hot air flowing to the temperature limiter to the outside of the shell, so as to avoid the temperature in the electric control cavity being too high and affecting the normal operation of the electric control box and the temperature limiter, and the guide member can prevent the hot air from impacting the temperature sensing surface of the temperature limiter and affecting the normal operation of the electric heater.

Description

Technical Field

[0001] The invention relates to the technical field of heating equipment, in particular to an electric heater with a temperature limiting protection function. Background Art

[0002] Electric heaters are easy to carry and use, and are widely used in homes, hotels and other places. They are especially popular in the south where it is damp and cold in winter and there is no heating. The main function of electric heaters is to generate heat and keep warm. In order to prevent the internal temperature from being too high and causing fire and other problems, a temperature limiter is generally set in the electric heater. In order for the electric heater to work properly, the temperature limiter is generally set in different areas from the heating element. However, when the temperature inside the electric heater is too high, the temperature limiter cannot obtain the internal temperature in time, which causes the temperature limiter to be unable to respond quickly, reducing the safety of the electric heater. Summary of the invention

[0003] In order to solve the technical problem that the electric heater has low safety due to the slow response of the temperature limiter, an electric heater with a temperature limiter and good waterproof performance and a temperature limit protection function is provided.

[0004] An electric heater comprises a shell and a temperature limiter. An electric control cavity and a hot runner are formed in the shell. A heating element is arranged in the hot runner. A connecting port is arranged between the electric control cavity and the hot runner. The temperature limiter is arranged in the electric control cavity, and the temperature sensing surface of the temperature limiter points to the hot runner through the connecting port.

[0005] An air outlet is disposed at the upper end of the shell, and one end of the hot runner away from the heating element is communicated with the air outlet.

[0006] The shell is also provided with a heat dissipation port, which is communicated with the electric control cavity, and the gas in the hot runner can flow to the outside of the shell after passing through the communication port and the heat dissipation port in sequence.

[0007] The electric heater comprises an electrical box, which is arranged in the electric control cavity. The temperature limiter is sealed and arranged inside the electrical box, and the temperature sensing surface of the temperature limiter protrudes from the electrical box and points to the hot runner.

[0008] The electric heater further comprises a side plate, which divides the interior of the shell into the electric control chamber and the hot runner, the communication port is arranged on the side plate, and the electrical box is fixedly arranged on the side plate.

[0009] The projection area of ​​the electrical box on the side panel is smaller than the area of ​​the communication port.

[0010] The electric heater further comprises a flow guide, which is arranged on the temperature limiter and extends into the hot runner and is located between the heating element and the temperature sensing surface.

[0011] The flow guide has an L-shaped cross section and comprises a vertically arranged sealing portion and a horizontally arranged flow blocking portion. The sealing portion is fixedly arranged on the temperature limiter, and the flow blocking portion is located between the heating element and the temperature sensing surface.

[0012] The sealing part is attached to the temperature limiter, a through hole is provided on the sealing part, and the temperature sensing surface passes through the through hole and points to the hot runner.

[0013] The gas flow direction in the hot runner is vertically upward, the heating element is arranged at the lower part of the hot runner, and the baffle is located above the heating element.

[0014] The electric heater with temperature limiting protection function provided by the present invention is provided with a temperature limiter to control problems inside the electric heater, and the connecting port can directly lead the hot air to the temperature limiter when the air outlet is blocked, thereby ensuring the timely response of the temperature limiter, and the temperature limiter is sealed inside the electrical box, which increases the waterproof performance of the electric heater. The heat dissipation port can discharge the hot air flowing to the temperature limiter to the outside of the shell, thereby avoiding excessive temperature in the electric control cavity and affecting the normal operation of the electric control box and the temperature limiter. The guide piece can prevent the hot air from impacting the temperature sensing surface of the temperature limiter and affecting the normal operation of the electric heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional view of an electric heater of an embodiment of an electric heater with a temperature limiting protection function provided by the present invention;

[0016] Figure 2 A schematic structural diagram of an electric heater with a temperature limiting protection function provided by the present invention without a side plate;

[0017] Figure 3 An exploded view of an electrical box, a temperature limiter and a flow guide member of an embodiment of an electric heater with a temperature limiting protection function provided by the present invention;

[0018] In the figure:

[0019] 1. Shell; 2. Temperature limiter; 11. Electric control chamber; 12. Hot runner; 3. Connecting port; 4. Air outlet; 5. Heat dissipation port; 6. Electrical box; 7. Side panel; 8. Flow guide;. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] like Figures 1 to 3 The electric heater shown includes a shell 1 and a temperature limiter 2. An electric control cavity 11 and a hot runner 12 are formed in the shell 1. A heating element is arranged in the hot runner 12. A connecting port 3 is arranged between the electric control cavity 11 and the hot runner 12. The temperature limiter 2 is arranged in the electric control cavity 11, and the temperature sensing surface of the temperature limiter 2 points to the hot runner 12 through the connecting port 3. The temperature limiter 2 can sense the temperature and alarm or stop the electric heater when the temperature of the electric heater is too high. When the electric heater works normally, the heating element heats the hot runner 12. The gas in the hot runner 12 is discharged from the shell 1 along the hot runner 12 after heating for normal heating. When the electric heater is operated abnormally, the hot gas in the hot runner 12 cannot be discharged directly from the shell 1, but can only enter the electric control cavity 11 through the connecting port 3. At this time, the temperature sensing surface of the temperature limiter 2 directly senses the temperature of the hot gas through the connecting port 3, thereby judging that the temperature in the hot runner 12 is too high, and then it can be concluded that the electric heater is in an abnormal working state, which speeds up the protection action time of the temperature limiter 2 and avoids the safety problems such as melting of components in the electric heater due to high temperature.

[0022] The electric heater also includes a flow guide 8, which is arranged on the temperature limiter 2, and the flow guide 8 extends into the hot runner 12 and is between the heating element and the temperature sensing surface. The flow guide 8 is used to shield the hot air generated by the heating element to a certain extent, preventing the hot air from directly rushing to the temperature sensing surface of the temperature limiter 2, so that the temperature limiter 2 is protected when the electric heater is working normally, affecting the heating effect of the electric heater.

[0023] The cross-section of the flow guide 8 is L-shaped, and includes a vertically arranged sealing portion and a horizontally arranged flow blocking portion. The sealing portion is fixedly arranged on the temperature limiter 2, and the flow blocking portion is between the heating element and the temperature sensing surface. The sealing portion can seal the corresponding side of the temperature limiter 2. In particular, the edge of the sealing portion is sealed and connected with the corresponding side of the electrical box 6 to ensure the waterproof performance of the temperature limiter 2, and the flow blocking portion can block the hot air.

[0024] The sealing portion is attached to the temperature limiter 2 , a through hole is provided on the sealing portion, and the temperature sensing surface passes through the through hole and points to the hot runner 12 .

[0025] The gas flow direction in the hot runner 12 is vertically upward. The heating element is arranged at the lower part of the hot runner 12, and the baffle is above the heating element. By utilizing the fact that hot air rises and cold air falls away, the baffle can block the hot air when the hot air rises naturally, thereby ensuring the reliability of the temperature limiter 2.

[0026] Example

[0027] A covering test was conducted on the electric heater A1 of the prior art (hereinafter referred to as A1) and the electric heater A2 of the present application (hereinafter referred to as A2):

[0028] Table 1-1

[0029] Temperature limiter parameters Plastic surface temperature Temperature limiter response time A1 90℃-105℃ 160℃ >4min A2 75℃ ＜144℃ <2min

[0030] It can be seen from the above table that when A1 is covered, its surface temperature can reach 160°C, and the temperature limiter needs to cut off the power after more than 4 minutes, which seriously exceeds the standard; after A2 is covered, the temperature limiter cuts off the power within <2 minutes, so that the surface temperature of the electric heater does not exceed 144°C, meeting the temperature rise requirement. In summary, the technical solution of the present application can increase the reaction rate of the temperature limiter, so that the surface temperature of the electric heater meets the temperature rise requirement when it is covered, effectively increasing the safety performance of the electric heater.

[0031] An air outlet 4 is provided at the upper end of the shell 1, and one end of the hot runner 12 away from the heating element is connected to the air outlet 4. The hot air heated by the heating element is discharged from the air outlet 4 to the outside of the shell 1 to complete the heating.

[0032] The shell 1 is also provided with a heat dissipation port 5, which is connected to the electric control chamber 11, and the gas in the hot runner 12 can flow to the outside of the shell 1 after passing through the connecting port 3 and the heat dissipation port 5 in sequence. The hot air in the hot runner 12 can form convection at the heat dissipation port 5, which speeds up the flow of hot air and avoids the problem of excessive temperature in the electric control chamber 11.

[0033] The electric heater includes an electrical box 6, which is arranged in the electric control cavity 11. The temperature limiter 2 is sealed inside the electrical box 6, and the temperature sensing surface of the temperature limiter 2 protrudes from the electrical box 6 and points to the hot runner 12. The electrical box 6 has a waterproof structure. In order to improve the waterproof performance of the temperature limiter 2, the temperature limiter 2 is directly sealed into the electrical box 6 to achieve the purpose of waterproofing.

[0034] The electric heater further includes a side plate 7 , which divides the interior of the housing 1 into the electric control chamber 11 and the hot runner 12 . The communication port 3 is disposed on the side plate 7 , and the electrical box 6 is fixedly disposed on the side plate 7 .

[0035] The projection area of ​​the electrical box 6 on the side panel 7 is smaller than the area of ​​the connecting port 3 , so that there is a gap when the electrical box 6 is arranged at the connecting port 3 , and the gap is used to enable hot air to flow to the outside of the shell 1 after passing through the connecting port 3 and the heat dissipation port 5 in sequence.

[0036] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electric heater, characterized in that: Comprising a shell (1) and a temperature limiter (2), the shell (1) is formed with an electric control cavity (11) and a hot runner (12), the hot runner (12) is provided with a heating element, a connecting port (3) is provided between the electric control cavity (11) and the hot runner (12), the temperature limiter (2) is arranged in the electric control cavity (11), and the temperature sensing surface of the temperature limiter (2) is directed toward the hot runner (12) through the connecting port (3); The electric heater further comprises a flow guide (8), wherein the flow guide (8) is arranged on the temperature limiter (2), and the flow guide (8) extends into the hot runner (12) and is located between the heating element and the temperature sensing surface; The flow guide (8) has an L-shaped cross section and comprises a vertically arranged sealing portion and a horizontally arranged flow blocking portion, the sealing portion being fixedly arranged on the temperature limiter (2), and the flow blocking portion being located between the heating element and the temperature sensing surface; The sealing portion is attached to the temperature limiter (2), a through hole is provided on the sealing portion, and the temperature sensing surface passes through the through hole and points to the hot runner (12); The electric heater comprises an electrical box (6), the electrical box (6) being arranged in the electrical control cavity (11), the temperature limiter (2) being sealed and arranged inside the electrical box (6), and the temperature sensing surface of the temperature limiter (2) protruding from the electrical box (6) and pointing toward the hot runner (12); The electric heater further comprises a side plate (7), wherein the side plate (7) divides the interior of the housing (1) into the electric control chamber (11) and the hot runner (12), the communication port (3) is arranged on the side plate (7), and the electrical box (6) is fixedly arranged on the side plate (7).

2. The electric heater according to claim 1, characterized in that: The gas flow direction in the hot runner (12) is vertically upward, the heating element is arranged at the lower part of the hot runner (12), and the baffle is located above the heating element.

3. The electric heater according to claim 1, characterized in that: An air outlet (4) is provided at the upper end of the shell (1), and an end of the hot runner (12) away from the heating element is in communication with the air outlet (4).

4. The electric heater according to claim 1, characterized in that: The shell (1) is also provided with a heat dissipation port (5), the heat dissipation port (5) being in communication with the electric control chamber (11), and the gas in the hot runner (12) can flow to the outside of the shell (1) after passing through the communication port (3) and the heat dissipation port (5) in sequence.

5. The electric heater according to claim 1, characterized in that: The projection area of ​​the electrical box (6) on the side plate (7) is smaller than the area of ​​the communication port (3).

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