A heating and radiating integrated electric heating fan device

Abstract

The application discloses a heating and radiating integrated electric heating fan device, which comprises an asynchronous motor and fan blades arranged in a containing shell; the asynchronous motor is a single-phase solid rotor asynchronous motor, which comprises a stator and a solid cylindrical rotor coaxially arranged on the inner side of the stator; the fan blades are arranged on one end of the asynchronous motor in the axial direction; the motor winding adopts an open structure; during operation, the motor generates heat in the form of loss by using a part of input electric power to increase the temperature of the rotor; another part of the input electric power is converted into mechanical power to drive the fan blades to rotate; the solid cylindrical rotor and the open winding provide a smooth ventilation path, air is driven to flow by the rotation of the fan, heat is taken away and transmitted to the room to increase the ambient temperature; in the running state, a high slip operation mode is adopted to further increase the rotor loss. The application realizes the integration of heating and radiating, effectively utilizes the input electric energy, and greatly improves the energy conversion efficiency and radiating capacity of the electric heating fan.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electric heating equipment, and more particularly relates to a heating and radiating integrated electric heating fan device. BACKGROUND

[0002] With the substantial improvement of people's living standards, the proportion of heating energy consumption in energy consumption gradually increases in winter. For example, in northern China, coal heating accounts for the majority, and a large amount of harmful gas (such as sulfur dioxide) emissions pollute the atmosphere, which is not in line with the era of energy conservation and environmental protection. More and more regions start from the user side to carry out the transformation of heating methods, encouraging residents to use efficient and clean electric heating, which also promotes the marketization, scaling and industrialization development of heating appliances. Therefore, the efficient energy saving of household heating appliances has become the focus of the whole society. The demand of the huge market and the policy requirements of energy saving and emission reduction not only bring new vitality to the household heating appliance market, but also pose new challenges to its efficient operation. Therefore, the development of efficient household heating appliances is of great significance to promote energy saving and emission reduction and realize green economic development in China.

[0003] The existing household heating appliances on the market are of two types: radiation / conduction radiating type, such as small sun heaters and electric heating stoves, and convection heat exchange type, such as air conditioners and electric fan heaters. Although the radiation / conduction radiating type heater can effectively improve the temperature of the local indoor environment, it is almost impossible to feel the temperature rise at a distance from the heater, and it is prone to safety hazards in the use of this type of heater due to the excessive local temperature. The convection heat exchange type heating equipment can improve the temperature in a larger range, but there are some other problems: if an air conditioner is used for heating, the cost is high and the power consumption is large; and the existing electric fan heaters on the market have relatively independent heating and radiating devices, and the fan blades are driven by an independent motor. The heating device uses resistance wire, and only part of the input power of the motor is converted into mechanical energy for use, while the heat energy converted by the motor loss is not effectively utilized, and the efficiency and energy utilization rate of the motor are low. In addition, when the motor is overloaded or fails to operate, the internal loss of the motor increases significantly, and the temperature rise increases sharply, which brings hidden dangers to the safe operation of the electric fan heater. SUMMARY

[0004] In view of the defects and improvement needs of the prior art, the present application provides a heating and radiating integrated electric heating fan device, which aims to improve the energy utilization rate of the electric heating fan.

[0005] To achieve the above-mentioned purpose, according to one aspect of the present application, a heating and radiating integrated electric heating fan device is provided, comprising: an asynchronous motor and fan blades.

[0006] The asynchronous motor is a single-phase solid rotor asynchronous motor, which comprises a stator and a solid cylindrical rotor coaxially arranged inside the stator.

[0007] The fan blade is arranged at one end of the asynchronous motor in the axial direction.

[0008] Further, the heating and heat dissipation integrated electric heating fan device provided by the application comprises a stator, and a motor winding arranged on the stator core, wherein the motor winding is of an open structure.

[0009] Further, the heating and heat dissipation integrated electric heating fan device provided by the application further comprises:

[0010] The temperature sensor is arranged inside the motor winding of the asynchronous motor.

[0011] The control module is used to cut off the connection between the asynchronous motor and the power supply when the temperature sensor detects that the temperature of the motor winding is higher than the preset first threshold value.

[0012] Further, the heating and heat dissipation integrated electric heating fan device provided by the application is made of a metal magnetic conductive material with a resistivity higher than a preset second threshold value.

[0013] Further, the heating and heat dissipation integrated electric heating fan device provided by the application is made of a metal magnetic conductive material with a resistivity higher than a preset second threshold value.

[0014] Further, the heating and heat dissipation integrated electric heating fan device provided by the application further comprises a containing shell, wherein the containing shell is assembled by two front and rear grid protective nets and surrounds the outside of the asynchronous motor and the fan blade.

[0015] Further, the heating and heat dissipation integrated electric heating fan device provided by the application further comprises a base connected to the containing shell, wherein the base is provided with a power line for connecting the asynchronous motor and the power supply.

[0016] Further, the heating and heat dissipation integrated electric heating fan device provided by the application is further provided with a working switch for controlling the on-off of the power supply on the base.

[0017] Further, the heating and heat dissipation integrated electric heating fan device provided by the application is further provided with a timing switch for controlling the running time of the asynchronous motor on the base.

[0018] Overall, the above technical solutions conceived by the application can achieve the following beneficial effects:

[0019] (1) The heating and heat dissipation integrated electric heating fan device provided by the application comprises an asynchronous motor with a solid cylindrical rotor and fan blades, and the fan blades are arranged at one end of the motor in the axial direction. The arrangement enables the asynchronous motor to have two functions, i.e. driving the fan blades to rotate and generating heat. Since the motor rotor is in a solid cylindrical shape, a smooth ventilation path can be provided. The rotation of the fan blades drives the air flow, so that the heat generated by the motor is diffused to the entire indoor environment by air convection, thereby improving the ambient temperature. The heating device and the heat dissipation device are integrated into the same asynchronous motor, so that the electrical energy input into the motor is fully utilized. For the entire device, part of the electrical energy input into the asynchronous motor of the electric heating fan is converted into heat energy for improving the ambient temperature, and the other part is converted into mechanical energy for diffusing the heat energy to the entire indoor environment. The overall energy conversion efficiency of the motor is close to 100%, which effectively improves the energy utilization rate of the electric heating fan, and the structure of the core part of the electric heating fan is simple.

[0020] (2) In the preferred scheme of the heating and heat dissipation integrated electric heating fan device provided by the application, the stator winding of the asynchronous motor adopts an open structure, which is beneficial to providing a smooth ventilation path and facilitating the diffusion of the heat generated by the motor to the environment.

[0021] (3) In the preferred scheme of the heating and heat dissipation integrated electric heating fan device provided by the application, a temperature sensor is further arranged inside the motor winding, and the control module cuts off the connection between the asynchronous motor and the power supply when the temperature sensor detects that the temperature of the motor winding is relatively high (higher than a preset first threshold value), thereby effectively avoiding the insulation damage caused by the local high temperature of the motor stator and ensuring the safe and stable operation of the electric heating fan.

[0022] (4) In the preferred scheme of the heating and heat dissipation integrated electric heating fan device provided by the application, the rotor is made of a metal material with good magnetic conductivity and high resistivity (higher than a preset second threshold value), which can improve the heating efficiency of the motor and further improve the ambient temperature rising effect.

[0023] (5) In the preferred scheme of the heating and heat dissipation integrated electric heating fan device provided by the application, the motor has a relatively high (higher than a preset third threshold value) slip ratio, so that the proportion of the rotor joule loss in the electromagnetic power is increased to improve the heating efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The structure schematic view of the heating and heat dissipation integrated electric heating fan device provided by the embodiment of the application;

[0025] Figure 2 The explosion view of the asynchronous motor in the electric heating fan provided by the embodiment of the application;

[0026] Figure 3 A cross-sectional schematic view of a single-phase solid rotor asynchronous motor provided by an embodiment of the present application is shown in the figure;

[0027] In all the figures, the same reference signs are used to denote the same elements or structures, wherein:

[0028] 1 - working switch, 2 - timing switch, 3 - base, 4 - asynchronous motor, 5 - fan blade, 6 - containing housing, 7 - power line, 8 - stator, 9 - motor winding, 10 - rotor, 11 - temperature sensor. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the figures and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] In the present application, the terms "first", "second", etc. (if any) in the present application and the figures are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0031] In order to solve the technical problems of low motor efficiency and low energy utilization rate in the existing air conditioners, fan heaters and other convection heat exchange type heating devices, the present application provides a heating and heat dissipation integrated electric heating fan device, the overall idea of which is to integrate the heating device and the heat dissipation device in the electric heating fan into the same asynchronous motor, and to provide a smooth ventilation path. While the asynchronous motor drives the fan blades to rotate, the airflow generated by the rotation of the blades diffuses the heat generated by the motor to the entire indoor space, thereby fully utilizing the heat generated by the asynchronous motor, improving the indoor temperature and effectively improving the energy utilization rate of the electric heating fan.

[0032] As shown in Figure 1 , Figure 2 and Figure 3 , in one embodiment of the present application, a heating and heat dissipation integrated electric heating fan device is provided, which comprises an asynchronous motor 4 and a fan blade 5.

[0033] In this embodiment, the asynchronous motor 4 is a single-phase solid rotor asynchronous motor, as shown in Figure 2 and Figure 3 , the asynchronous motor 4 specifically comprises a stator 8 and a solid cylindrical rotor 10 coaxially arranged on the inside of the stator 8; the fan blade 5 is arranged at one end of the rotor 10 in the axial direction.

[0034] Since the rotor of the asynchronous motor in the embodiment is a solid cylinder, a smooth ventilation path can be provided to facilitate the convective transmission of the heat of the rotor; in the process of driving the fan blades to rotate, the asynchronous motor drives the air flow and generates an air flow in the cylindrical structure of the rotor from one end where the fan blades are installed to the other end, which carries away and diffuses the heat generated by the motor to the indoor environment to improve the indoor environment temperature. For the convenience of description, the one end of the rotor where the fan blades are installed is referred to as the rear end, and the other end is referred to as the front end.

[0035] According to the working principle of the motor, when the asynchronous motor is stably operated at a rotating speed n (with a slip rate s), the electrical power input from the electrical port is P1, the stator copper loss p cu1 is:

[0036] p cu1 = m1I1 2 R1 (1)

[0037] wherein m1 is the number of stator winding phases, I1 is the stator side current, and R1 is the resistance of the stator winding.

[0038] The stator iron loss p Fe1 is:

[0039] p Fe1 = m1I0 2 R m (2)

[0040] wherein I0 is the excitation branch current, and R m is the equivalent resistance of the stator iron loss.

[0041] After the input electrical power is deducted by the stator copper loss and the stator iron loss, the remaining part of the power is transmitted from the stator side to the rotor side by means of the rotating magnetic field in the air gap, i.e., the electromagnetic power P em , which is expressed as follows:

[0042] P em = P1-p cu1 -p Fe1 (3)

[0043] The electromagnetic power on the rotor side is composed of two parts, i.e., the rotor Joule loss p cu2 and the mechanical power P mec , and the distribution relationship is determined by the slip rate s; the rotor Joule loss p cu2 and the mechanical power P mec are respectively as follows:

[0044] p cu2 = sP em (4)

[0045] P mec = (1-s)Pem (5)

[0046] Mechanical power P mec The mechanical power P will be used to drive the fan blades to rotate. Although the shaft end output mechanical power is small, the efficiency of the electric energy conversion into mechanical energy is low, but the function of the asynchronous motor in the device includes heating and driving the fan blades to rotate, and the fan blades are installed at the rear end of the motor, and the loss part of the motor (including the stator loss and the rotor loss) is dissipated in the form of heat, which is diffused to the entire indoor environment by the driven fan blades through air convection, which has the beneficial effect of raising the ambient temperature. Therefore, for the entire device, part of the electric energy input to the motor is converted into heat energy, and part of it is converted into mechanical energy, and the overall energy conversion efficiency of the motor can be considered as 100%.

[0047] When the motor is running, the current and magnetic flux on the rotor are distributed in a thin layer on the surface of the rotor due to the skin effect. In order to improve the heating efficiency of the motor and thus improve the heating effect, in the embodiment, the solid rotor is made of a metal material with good magnetic conductivity and high resistivity, and in the embodiment, the rotor of the asynchronous motor is made of steel. In actual application, according to the specific heating efficiency requirement, a corresponding threshold value can be set, and only the metal magnetic conductive material with a resistivity higher than the threshold value is selected to make the rotor. It should be noted that other materials can also be used in the embodiment under the condition of meeting the requirements of magnetic conductivity and heating efficiency.

[0048] Based on the above formulas (4) and (5), it can be known that under the condition of constant electromagnetic power, taking the measure of increasing the slip ratio can further improve the rotor copper loss and increase the heating efficiency of the motor. Since the power required for the rotation of the fan blades is very small, even if the mechanical power is reduced due to the increase of the slip ratio, the motor can also drive the load to operate. Based on this consideration, in the embodiment, the asynchronous motor has a high slip ratio when it is stably running under the condition that the fan blades can rotate normally, thereby further improving the heating efficiency of the motor.

[0049] In view of the problems that the three-phase motor cannot be directly powered by household electricity and the single-phase single-winding asynchronous motor does not have a self-starting function, as shown in FIG. Figure 2 The stator 8 specifically includes: a stator core, and a motor winding 9 arranged on the stator core; the motor winding 9 includes a starting winding and a working winding in parallel, the starting winding and the working winding are mutually different by 90° electrical angle in space, and the starting winding is connected in series with a capacitor; based on the design of the stator, the embodiment can make the asynchronous motor have a self-starting capability under the condition of household electricity power supply, saving the space and cost of the additional inverter; the motor winding 9 of the asynchronous motor is of an open structure, which is conducive to providing a smooth ventilation path, using the rotation of the fan to drive the air flow, taking away the heat generated by the motor and transmitting it to the indoor environment, and improving the indoor ambient temperature.

[0050] Overall, the embodiment utilizes an asynchronous motor with a solid cylindrical rotor to drive the fan blades to rotate, integrates the heating device and the heat dissipation device in the electric heating fan into the same asynchronous motor, and provides a smooth ventilation path. The asynchronous motor is used to generate heat and drive the fan blades to rotate, which not only saves the internal space of the device and reduces the overall volume of the device, but also effectively utilizes the electric energy, and the energy-saving effect is remarkable.

[0051] In view of the problem that the heating device is prone to local temperature too high, as a preferred embodiment, the embodiment further comprises a temperature sensor 11 and a control module (not shown in the figure); the temperature sensor 11 is specifically arranged in the internal of the motor winding, and is used for sensing the temperature rise of the motor stator; and the control module is used for cutting off the connection between the asynchronous motor and the power supply when the temperature sensor 11 detects that the temperature of the motor winding is higher than a preset first threshold value, so as to prevent the problem of too high temperature rise of the motor winding due to failure, and ensure the safe and stable operation of the electric heating fan; in addition, even if the user forgets to turn off the electric heating fan, it will not cause the room temperature to be too high, or cause a fire hazard and other safety hazards.

[0052] Referring to Figure 1 , the embodiment further comprises a containing shell 6; the containing shell 6 surrounds the outside of the asynchronous motor and the fan blades, and is assembled by two front and rear grid protective nets. The asynchronous motor and the fan are surrounded inside by the two grid protective nets, which plays a role of safety protection while ensuring ventilation.

[0053] Referring to Figure 1 , the embodiment further comprises:

[0054] The base 3 connected with the containing shell 6, on which a power line 7 for connecting the asynchronous motor and the power supply is arranged;

[0055] The working switch 1 arranged on the base 3, used for controlling the power on-off;

[0056] And the timing switch 2 arranged on the base 3, used for controlling the running time of the asynchronous motor.

[0057] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A heating and heat dissipating integrated electric heating fan device, characterized in that, Comprise: An asynchronous motor and a fan blade; The asynchronous motor is a single-phase solid rotor asynchronous motor, which comprises a stator and a solid cylindrical rotor coaxially arranged inside the stator; The fan blade is arranged at one end of the asynchronous motor in the axial direction; The stator comprises a stator core and a motor winding arranged on the stator core; the motor winding is of an open structure; The motor winding comprises a starting winding and a working winding in parallel, the starting winding and the working winding are spatially different by 90° electrical angle, and the starting winding is connected in series with a capacitor; The rotor is made of a metal magnetic conductive material with a resistivity higher than a preset second threshold value; The slip of the asynchronous motor is higher than a preset third threshold value; In operation, the input electric power, after deducting the stator copper loss and iron loss, the remaining part of the power is transmitted from the stator side to the rotor side by means of the rotating magnetic field in the air gap, i.e. the electromagnetic power The electromagnetic power on the rotor side is composed of two parts, the rotor Joule loss and the mechanical power The mechanical power will be used to drive the fan blades to rotate, the loss part of the motor, in the form of heat, is diffused to the entire indoor by means of air convection by the driven fan blades.

2. The heating and heat dissipating integrated electric heating fan device according to claim 1, wherein, Further comprise: A temperature sensor arranged inside the motor winding of the asynchronous motor; And a control module for cutting off the connection between the asynchronous motor and the power supply when the temperature sensor detects that the temperature of the motor winding is higher than a preset first threshold value.

3. The electric heating fan device of claim 1 or 2, wherein the electric heating fan device further comprises a heating element. Further comprise: A containing shell; the containing shell is composed of two front and rear grid protective nets and surrounds the outside of the asynchronous motor and the fan blade.

4. The heating and heat dissipating integrated electric heating fan device according to claim 3, characterized in that, Further comprise: A base connected with the containing shell, and a power line for connecting the asynchronous motor and the power supply is arranged on the base.

5. The heating and heat dissipating integrated electric heating fan device according to claim 4, wherein, A working switch for controlling the on-off of the power supply is further arranged on the base.

6. The heating and heat dissipating integrated electric heating fan device according to claim 5, wherein, A timing switch for controlling the running time of the asynchronous motor is further arranged on the base.

Images