JPH0559173U - Air cooling fan device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an air-cooling fan device capable of controlling fan rotation according to ambient temperature without the need to install a control circuit outside, and without the trouble of installation work. [Structure] An air-cooled fan device 1 configured by housing a rotary blade 4 and a drive source 5 for rotationally driving the rotary blade 4 in a housing
In the housing 2, a temperature sensor 9 for detecting the temperature of the air passing through the housing 2 and a drive control circuit for controlling the rotational drive speed of the drive source 5 according to the temperature detected by the temperature sensor 9 are provided in the housing 2. It is characterized by being installed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air-cooling fan device that minimizes noise accompanying rotation of a rotary blade.

[0002]

[Prior Art]

 Conventionally, as a method of suppressing the noise of the air-cooling fan device, since the rotating blade (fan) is driven to rotate at a low rotation speed when the temperature decreases, a signal from a temperature sensor provided outside the housing of the fan device is used. It is also known to adjust the rotation speed of the rotor by inputting it to a control circuit provided outside the housing to generate an appropriate control signal and supplying it to the drive source of the fan device.

[0003]

[Problems to be solved by the device]

 However, in such a rotation control type air cooling fan device, it is necessary to externally attach a dedicated circuit board on which the above control circuit is formed at the time of installation. For this reason, it is necessary to provide a space for circuit layout outside the fan device.However, because the space for installing the fan device is usually limited, the layout of the circuit board and the control circuit There was a problem that the installation work was troublesome due to the need to devise a wiring for connecting the cables.

Further, the detected temperature is the temperature at the installation location of the temperature sensor connected to the control circuit, and there is also a problem that it does not necessarily match the ambient temperature of the fan device.

An object of the present invention is to solve the above-mentioned problems, to eliminate the need for installing a control circuit outside the fan device, to eliminate the trouble of installation work, and to control the fan rotation according to the ambient temperature. An object is to provide an air cooling fan device.

[0006]

[Means for Solving the Problems]

 The present invention relates to an air-cooling fan device configured by housing a rotary blade and a drive source for rotationally driving the rotary blade, and a temperature sensor for detecting the temperature of air passing through the housing and the temperature sensor. And a drive control circuit for controlling the rotational drive speed of the drive source in accordance with the temperature detected in the step 1.

In one aspect of the present invention, a bimetal is used as a temperature sensor, and the drive control circuit includes a contact point at which the bimetal contacts when the temperature of air rises above a preset value, and a contact point between the bimetal and the contact point. And a resistance circuit that changes the supply voltage to the drive source depending on the presence or absence of the contact.

In another aspect of the present invention, a thermistor is used as the temperature sensor, and the drive control circuit is composed of a switching circuit that changes the supply voltage to the drive source according to the change of the output voltage from the thermistor. It

[0009]

[Action]

 According to the present invention, since the temperature sensor and the drive control circuit are housed in the housing of the device, the air-cooling fan device itself controls the speed of the rotor blades according to the ambient temperature to reduce the noise caused by the fan operation. It can be minimized. In addition, at the time of installation, there is no need to install a temperature sensor or control circuit board outside the fan device, so no space or wiring is required for that purpose.

When a bimetal is used as the temperature sensor, the speed of the rotary blade is controlled according to the mechanical contact / non-contact between the bimetal and the contact point in the resistance circuit. When a thermistor is used as a temperature sensor, the speed of the rotor blades is controlled by the operation of the switching circuit, which depends on the change in output voltage from the thermistor corresponding to the temperature.

[0011]

【Example】

 FIG. 1 shows an embodiment of an air cooling fan device of the present invention. This air-cooling fan device 1 has a rectangular parallelepiped housing 2, and a rotary blade 4 and a drive source 5 including a motor for rotationally driving the rotary blade 4 are housed in a circular opening 3 through which air flows. In a well-known type fan device configured by being fixed by a cross-shaped support member 6, a hollow peripheral wall is formed around the opening 3 of the housing 2, and the hollow peripheral wall is formed in the lower right corner inside thereof when viewed from the front side. Is a case 7 having a substantially triangular prism shape that houses a drive control circuit that controls the rotational drive speed of the drive source 5 according to the temperature detected by a temperature sensor described later, and a cable 8 connecting the drive control circuit and the power supply. Is extended from the lower right corner to the outside of the housing 2.

As the temperature sensor, for example, a bimetal or a thermistor is used. When the former is used, the bimetal is installed in the case 7 together with the drive control circuit, which will be described later, and when the latter is used, the thermistor 9 is a suitable cross-shaped support member 6 as shown in the figure. It is installed at various positions.

2 and 3 show a specific example of the drive control circuit when a bimetal is used.

In FIG. 2, a resistance circuit 13 is formed between an external power source (not shown) and the drive source 5 and a bimetal 11 and a contact 12 with which the moving end of the bimetal 11 contacts, and a resistor R1 connected in parallel. .. The moving end of the bimetal 11 comes into contact with the contact 12 when the temperature exceeds a set value. Therefore, when the temperature is lower than the set value, the power supply current flows through the resistor R1 to the drive source 5, but when the temperature exceeds the set value and the bimetal 11 contacts the contact 12, the power supply current is mainly The resistance value of the resistance circuit 13 decreases, and the rotational drive speed of the drive source 5 increases. Thus, the rotation speed of the fan is controlled in two stages.

In FIG. 3, in addition to the configuration of FIG. 2, a contact point 21 is in contact with the bimetal 11 and a two-point contact type in which another point is connected to another wiring. A resistance circuit 22 in which a second resistor R2 is connected between the wiring to be connected and the resistor R1 is formed. Therefore, when the temperature is lower than the set value, the power supply current flows to the drive source 5 through the two resistors R1 and R2, but when the temperature exceeds the set value and the bimetal 11 contacts the contact 21, the power supply current Mainly flows through the bimetal 11 and the resistor R2, and when the temperature further rises and the contact 21 is connected to another wiring at another point, the power supply current flows from the bimetal 11 through the wiring and the resistance circuit 22 The resistance of the fan is minimized and the fan is driven to rotate at the highest speed. Thus, the rotation speed of the fan is controlled in three stages.

In the circuits of FIGS. 2 and 3, the set temperature can be made variable by operating the lever by providing a lever for adjusting the position of the contact 12 or 21 with which the bimetal 11 contacts.

FIG. 4 shows a specific example of the drive control circuit when a thermistor is used.

In this circuit, a switching circuit 23 that changes the supply voltage to the drive source 5 by the voltage change in the thermistor 9 in FIG. 1 is provided between the external power source (not shown) and the drive source 5. The switching circuit 32 is configured by connecting two transistors Q1 and Q2, three fixed resistors R3, R4 and R5, and one variable resistor RV as shown in the figure.

Therefore, if the thermistor 9 is of a type in which the electric resistance value decreases with increasing temperature, when the temperature is higher than the temperature detected by the thermistor 9 (which is adjusted by the variable resistor RV), the transistor Q2 The base current of the transistor Q2 decreases and the collector current of the transistor Q2 decreases. Since the base of the transistor Q1 has a relatively high voltage, the emitter current of the transistor Q1 increases and the current is supplied to the driving source 5. To be done. On the other hand, when the temperature exceeds the detection temperature, the collector current of the transistor Q2 increases and the base voltage of the transistor Q1 decreases, so that the emitter current of the transistor Q1 decreases and the current is supplied to the driving source 5. .. By controlling the current flowing through the transistor Q1 in this manner, the rotation speed of the fan is controlled.

Although the illustrated embodiment has been described above, the present invention is not limited to this, and in particular, the drive control circuit can be arbitrarily configured according to the type of the temperature sensor.

[0021]

[Effect of the device]

 As described above, according to the present invention, the air-cooling fan device itself controls the speed of the rotor blades according to the ambient temperature without externally providing a fan rotation control circuit to minimize noise. In addition, the power consumption can be reduced to the required minimum and the space outside the fan device can be saved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an air cooling fan device of the present invention.

FIG. 2 is a diagram showing an example of a control circuit when a bimetal is used.

FIG. 3 is a diagram showing another example of a control circuit when a bimetal is used.

FIG. 4 is a diagram showing an example of a control circuit when a thermistor is used.

[Explanation of symbols]

1 ... Air cooling fan device, 2 ... Housing, 3 ... Opening part, 4
... Rotary blades, 5 ... Drive source, 6 ... Supporting member, 7 ... Case, 8
… Cable, 9… Thermistor, 11… Bimetal, 1
2, 21 ... Contact point, 13, 22 ... Resistor circuit, 23 ... Switching circuit.

Claims (1)

[Scope of utility model registration request] 1. An air-cooling fan device constructed by housing a rotary blade and a drive source for rotationally driving the rotary blade in a housing, and a temperature sensor for detecting a temperature of air passing through the housing; An air-cooling fan device, wherein a drive control circuit for controlling a rotational drive speed of the drive source according to a temperature detected by a temperature sensor is installed in the housing.