Cooling fan and cooking utensil

Abstract

The utility model belongs to the technical field of kitchen appliances, and particularly relates to a cooling fan and a cooking utensil. The cooling fan comprises a fan body, a normally-closed temperature controller and a normally-open temperature controller, the fan body is provided with a low-speed-gear terminal and a high-speed-gear terminal, the normally-closed temperature controller is arranged on a circuit between the low-speed-gear terminal and a power source, and the normally-open temperature controller is arranged on a circuit between the high-speed-gear terminal and the power source. The temperature sensor and the normally closed temperature controller are arranged in parallel; and when the environment temperature exceeds a preset high temperature value, the normally closed temperature controller is switched off, and the normally open temperature controller is switched on. By arranging the normally-closed temperature controller and the normally-open temperature controller, the rotating speed of the fan body can be switched along with the environment temperature, the heat dissipation capacity of the heat dissipation fan can be guaranteed, noise can be reduced, the structure is simple, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a heat dissipation fan and a cooking utensil. Background Art

[0002] Steamers, ovens, and steam-bake-in-one machines are common kitchen cooking appliances. They are convenient, fast, and safe, bringing great convenience to people's cooking lives, and are therefore becoming increasingly popular. Since the cooking cavity is at a high temperature when it is working, it is basically necessary to equip it with a cooling fan to dissipate heat for various components, especially electronic devices. Usually, a lower-priced shaded-pole motor is used. The shaded-pole motor is powered by AC and has an unadjustable speed. The resulting noise problem has also become a problem that has been difficult to solve.

[0003] The commonly used solution at present is to use a motor with adjustable speed in combination with a temperature sensor. When the temperature sensor detects that the temperature is higher than the set value, the motor is controlled to work at high speed. When the temperature sensor detects that the temperature is lower than the set value, the motor speed is reduced. The shortcomings of the existing solution are: first, the motor is usually a brushless DC motor, which is complex to control and expensive; second, in addition to two power lines, speed control lines, speed feedback lines, etc. are also required. In addition, a temperature sensor is required, and the power board also needs to have a corresponding interface and supporting program control. The overall solution is complex, unreliable, and costly. Utility Model Content

[0004] The utility model aims to provide a heat dissipation fan and a cooking utensil, which can ensure the heat dissipation capacity of the heat dissipation fan and reduce noise, and have a simple structure and low cost.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Cooling fan, including:

[0007] The fan body has a low speed gear terminal and a high speed gear terminal;

[0008] A normally closed thermostat is arranged on the circuit between the low speed gear terminal and the power supply;

[0009] A normally open thermostat is arranged on the line between the high-speed gear terminal and the power supply, and is arranged in parallel with the normally closed thermostat;

[0010] When the ambient temperature exceeds a preset high temperature value, the normally closed thermostat is disconnected and the normally open thermostat is connected.

[0011] As an optimal technical solution for the heat dissipation fan, the operating temperature value of the normally closed thermostat is a first high temperature preset value, and the operating temperature value of the normally open thermostat is a second high temperature preset value, and the second high temperature preset value is greater than or equal to the first high temperature preset value.

[0012] As an optimal technical solution for the heat dissipation fan, the normally closed thermostat includes a first moving contact piece, a first stationary contact piece and a first bimetallic piece. The first moving contact piece and the first stationary contact piece are arranged in contact with each other. The first bimetallic piece is configured to operate when the ambient temperature exceeds the preset high temperature value, and when the first bimetallic piece operates, it can drive the first moving contact piece to separate from the first stationary contact piece through a first push rod.

[0013] As an optimal technical solution for the heat dissipation fan, the normally open thermostat includes a second moving contact piece, a second static contact piece and a second bimetallic piece. The second moving contact piece and the second static contact piece are arranged non-contactly. The second bimetallic piece is configured to operate when the ambient temperature exceeds the preset high temperature value, and when the second bimetallic piece operates, it can drive the second moving contact piece to contact the second static contact piece through the second push rod.

[0014] As a preferred technical solution for the heat dissipation fan, the normally closed thermostat and the normally open thermostat are both jump-type thermostats.

[0015] As a preferred technical solution for the heat dissipation fan, the fan body further has a common terminal, the common terminal is electrically connected to one end of the power supply, and the low speed gear terminal and the high speed gear terminal are electrically connected to the other end of the power supply.

[0016] As an optimal technical solution for the heat dissipation fan, the fan body is a shaded-pole motor.

[0017] As an optimal technical solution for the heat dissipation fan, the power supply is 220V AC.

[0018] A cooking appliance comprises a cooking cavity, an electric control board and a heat dissipation fan as described in any of the above schemes, wherein the electric control board and the heat dissipation fan are both arranged outside the cooking cavity, and the heat dissipation fan is used to dissipate heat from the electric control board.

[0019] As a preferred technical solution for the cooking utensil, the cooking utensil is a steamer, an oven or a steam-bake-in-one machine.

[0020] Beneficial effects of the utility model:

[0021] An embodiment of the utility model provides a heat dissipation fan, including a fan body, a normally closed thermostat and a normally open thermostat, wherein the fan body has a low-speed gear terminal and a high-speed gear terminal, the normally closed thermostat is arranged on the line between the low-speed gear terminal and the power supply, the normally open thermostat is arranged on the line between the high-speed gear terminal and the power supply, and the normally closed thermostat and the normally open thermostat are arranged in parallel. When the temperature of the working environment of the fan body is low, the normally closed thermostat is in the on state, the normally open thermostat is in the off state, and the fan body works at a low speed gear. At this time, the low speed gear can meet the heat dissipation requirements and has low noise; when the temperature of the working environment of the fan body gradually rises to the high temperature preset value, the normally closed thermostat is disconnected, the normally open thermostat is connected, and the fan works at a high speed gear. At this time, the heat dissipation capacity can be improved to ensure that the temperature of each heat dissipation component does not exceed the standard, thereby ensuring the reliability of the operation of each heat dissipation component; when the temperature of the working environment of the fan body drops to the reset temperature value, the normally closed thermostat returns to the on state, the normally open thermostat returns to the off state, and the fan returns to the low speed gear. By setting the normally closed thermostat and the normally open thermostat, the speed of the fan body can be switched with the ambient temperature, which can not only ensure the heat dissipation capacity of the heat dissipation fan, but also reduce noise, and the structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a fan body in a heat dissipation fan provided by an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the principle of the heat dissipation fan provided by the embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of a cooking utensil provided in an embodiment of the utility model.

[0025] In the figure:

[0026] 10. Cooking cavity; 20. Electric control board; 30. Cooling fan; 31. Fan body; 311. Low speed gear terminal; 312. High speed gear terminal; 313. Common terminal; 32. Normally closed thermostat; 33. Normally open thermostat. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] like Figure 1 to Figure 2 As shown, an embodiment of the utility model provides a heat dissipation fan 30, including a fan body 31, a normally closed thermostat 32 and a normally open thermostat 33, wherein the fan body 31 has a common terminal 313, a low-speed gear terminal 311 and a high-speed gear terminal 312, the common terminal 313 is electrically connected to one end of the power supply, and the low-speed gear terminal 311 and the high-speed gear terminal 312 are both electrically connected to the other end of the power supply; the normally closed thermostat 32 is arranged on the line between the low-speed gear terminal 311 and the power supply, and the normally open thermostat 33 is arranged on the line between the high-speed gear terminal 312 and the power supply, and the normally closed thermostat 32 and the normally open thermostat 33 are arranged in parallel; when the ambient temperature exceeds the high temperature preset value, the normally closed thermostat 32 is disconnected and the normally open thermostat 33 is connected.

[0032] When the temperature of the working environment of the fan body 31 is low, the normally closed thermostat 32 is in the on state, the normally open thermostat 33 is in the off state, and the fan body 31 works at a low speed gear. At this time, the low speed gear can meet the heat dissipation demand and has low noise; when the temperature of the working environment of the fan body 31 gradually increases and reaches the high temperature preset value, the normally closed thermostat 32 is disconnected, the normally open thermostat 33 is connected, and the fan works at a high speed gear. At this time, the heat dissipation capacity can be improved to ensure that the temperature of each heat dissipation component does not exceed the standard, thereby ensuring the reliability of the operation of each heat dissipation component; when the temperature of the working environment of the fan body 31 drops to the reset temperature value, the normally closed thermostat 32 returns to the on state, the normally open thermostat 33 returns to the off state, and the fan returns to the low speed gear.

[0033] By setting the normally closed thermostat 32 and the normally open thermostat 33, the speed of the fan body 31 can be switched according to the ambient temperature, which can not only ensure the heat dissipation capacity of the heat dissipation fan 30, but also reduce noise, and has a simple structure and low cost. In this embodiment, the fan body 31 is a shaded pole motor, which is powered by AC, and the power supply adopts 220V AC, which is relatively low in cost.

[0034] Specifically, the normally closed thermostat 32 and the normally open thermostat 33 are both jump-type thermostats. The normally closed thermostat 32 includes a first moving contact, a first static contact and a first bimetallic strip, the first moving contact and the first static contact are respectively connected to two wiring terminals of the normally closed thermostat 32, the first moving contact and the first static contact are contacted, the first bimetallic strip is configured to actuate when the ambient temperature exceeds a preset high temperature value, and when the first bimetallic strip actuates, the first moving contact can be driven to separate from the first static contact by the first push rod. When the ambient temperature drops to the reset temperature value, the first bimetallic strip is reset, and the first moving contact and the first static contact are restored to the contact state. Through the above structure, the normally closed thermostat 32 achieves the purpose of connecting or disconnecting the circuit. The normally open thermostat 33 includes a second moving contact, a second static contact and a second bimetallic strip. The second moving contact and the second static contact are respectively connected to two wiring terminals of the normally open thermostat 33. The second moving contact and the second static contact are non-contactingly arranged. The second bimetallic strip is configured to actuate when the ambient temperature exceeds a preset high temperature value, and when the second bimetallic strip actuates, it can drive the second moving contact to contact the second static contact through the second push rod. When the ambient temperature drops to the reset temperature value, the second bimetallic strip is reset, and the second moving contact and the second static contact return to a non-contact state. Through the above structure, the normally open thermostat 33 achieves the purpose of connecting or disconnecting the circuit. The above structures are all prior art and will not be elaborated on in detail here.

[0035] Specifically, the action temperature value of the normally closed thermostat 32 is the first high temperature preset value, and the action temperature value of the normally open thermostat 33 is the second high temperature preset value. Optionally, the first high temperature preset value is equal to the second high temperature preset value, that is, the normally closed thermostat 32 and the normally open thermostat 33 act at the same time, that is, when the ambient temperature reaches the first high temperature preset value or the second high temperature preset value, the normally closed thermostat 32 is disconnected, and the normally open thermostat 33 is connected. Or, optionally, the second high temperature preset value is greater than the first high temperature preset value, that is, the action of the normally open thermostat 33 lags behind the action of the normally closed thermostat 32, that is, when the ambient temperature reaches the first high temperature preset value, the normally closed thermostat 32 is disconnected, the fan body 31 stops, and the ambient temperature continues to rise. When the ambient temperature rises to the second high temperature preset value, the normally open thermostat 33 is connected, and the fan body 31 works at a high speed. By setting the second high temperature preset value to be greater than the first high temperature preset value, it is possible to avoid the situation where the normally closed thermostat 32 and the normally open thermostat 33 are simultaneously in the on state due to the action deviation of the thermostat itself.

[0036] like Figure 3 As shown, the embodiment of the utility model further provides a cooking appliance, comprising a cooking cavity 10, an electric control board 20 and the above-mentioned heat dissipation fan 30, the electric control board 20 and the heat dissipation fan 30 are both arranged outside the cooking cavity 10, and the heat dissipation fan 30 is used to dissipate heat from the electric control board 20. By arranging the above-mentioned heat dissipation fan 30, the heat dissipation demand can be met, the noise can be reduced, and the cost is low.

[0037] Optionally, the cooking appliance is a steamer, an oven, or a steam-bake-in-one machine, but is not limited thereto.

[0038] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A cooling fan, characterized in that: include: The fan body (31) has a low-speed gear terminal (311) and a high-speed gear terminal (312); A normally closed thermostat (32) is arranged on a circuit between the low speed gear terminal (311) and a power source; A normally open thermostat (33) is arranged on a circuit between the high-speed gear terminal (312) and a power source, and is arranged in parallel with the normally closed thermostat (32); When the ambient temperature exceeds a preset high temperature value, the normally closed thermostat (32) is disconnected and the normally open thermostat (33) is connected.

2. The heat dissipation fan according to claim 1, characterized in that: The operating temperature value of the normally closed thermostat (32) is a first high temperature preset value, and the operating temperature value of the normally open thermostat (33) is a second high temperature preset value, and the second high temperature preset value is greater than or equal to the first high temperature preset value.

3. The heat dissipation fan according to claim 1, characterized in that: The normally closed thermostat (32) comprises a first moving contact piece, a first stationary contact piece and a first bimetallic strip, wherein the first moving contact piece and the first stationary contact piece are arranged in contact with each other, the first bimetallic strip is configured to be actuated when the ambient temperature exceeds the preset high temperature value, and when the first bimetallic strip is actuated, the first moving contact piece can be driven to separate from the first stationary contact piece by a first push rod.

4. The heat dissipation fan according to claim 1, characterized in that: The normally open temperature controller (33) comprises a second moving contact piece, a second stationary contact piece and a second bimetallic piece, wherein the second moving contact piece and the second stationary contact piece are arranged in a non-contact manner, and the second bimetallic piece is configured to be actuated when the ambient temperature exceeds the preset high temperature value, and when the second bimetallic piece is actuated, the second moving contact piece can be driven to contact the second stationary contact piece through a second push rod.

5. The heat dissipation fan according to claim 1, characterized in that: The normally closed thermostat (32) and the normally open thermostat (33) are both jump-type thermostats.

6. The heat dissipation fan according to claim 1, characterized in that: The fan body (31) also has a common terminal (313), the common terminal (313) is electrically connected to one end of a power source, and the low-speed gear terminal (311) and the high-speed gear terminal (312) are electrically connected to the other end of the power source.

7. The heat dissipation fan according to claim 1, characterized in that: The fan body (31) is a shaded-pole motor.

8. The heat dissipation fan according to claim 1, characterized in that: The power supply is 220V alternating current.

9. A cooking utensil, characterized in that: The invention comprises a cooking cavity (10), an electric control board (20) and a heat dissipation fan (30) as claimed in any one of claims 1 to 8, wherein the electric control board (20) and the heat dissipation fan are both arranged on the outside of the cooking cavity (10), and the heat dissipation fan (30) is used to dissipate heat from the electric control board (20).

10. The cooking appliance according to claim 9, characterized in that The cooking appliance is a steamer, an oven or a steam-bake-in-one machine.

Images