JPS61184352A - Heat pump type air conditioner - Google Patents

Abstract

PURPOSE:To obtain a heat pump type air conditioner operated normally even at low ambient air temperature by a method wherein the circumference tempera ture of electron parts is detected by a temperature detector and the device controlling the conduction of an electric heating device is provided. CONSTITUTION:In case the circumference temperature of a base plate 41 is higher than the lower limit temperature of the normal operation temperature at electron parts, a thermo-lead-switch is in closed condition. When an operation switch is closed in this condition, a magnetic contactor 35 is conducted to close a contact 35a. Accordingly, a micro-computer control circuit 3 is conducted through an insulating transformed 39 and the circuit 3 starts the operation. In case the circumference temperature of the base plate 41 is lower than the lower limit temperature of the normal operation temperature at the electron parts, the electric heating device 32 is conducted to heat the base plate 41. When it arrives at the lower limit temperature or above of the normal operation temperature, the thermo-lead-switch is closed while the magnetic contactor 35 is conducted and the contact 35a is closed, therefore, the conduction for the electric heating device 32 is cut and the micro-computer control circuit 3 may be conducted to start the operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat pump type air conditioner.

[Conventional technology]

Figures 2 to 5 relate to a heat pump air conditioner disclosed in, for example, Japanese Patent Laid-Open No. 58-83166, and Figure 2 shows the basics of the electric circuit 1 and refrigeration cycle 2 of an inverter-controlled air conditioner. For example, the electric circuit 1f'i is roughly divided into a microcomputer control circuit 3 and an inverter circuit 4. The microcomputer control circuit 3 processes input from the operation operation switch and each sensor with a microcomputer, It has a system control function 5 and a cycle control function 6. The inverter circuit 4 includes a PWM waveform control circuit 7, a base drive circuit 8, a converter section 9, an inverter section 10, and the like. The refrigeration cycle 2 includes an indoor heat exchanger 11, an indoor blower 12, an accumulator 13, a compressor 14, a four-way solenoid valve 15,
It is composed of an outdoor heat exchanger 16, an outdoor blower 17, a refrigerant flow control valve 18, a capillary tube 19, and the like. 20 is a single phase power supply.

As shown in FIGS. 3 to 5, the outdoor heat exchanger 16 and the outdoor blower 17 are provided in the heat exchanger chamber 22 of the outdoor unit main body 21, and the compressor 14 is provided in the compressor chamber 24 together with the electrical equipment box 23. ing. That is, the interior of the outdoor unit main body 21 is divided by a partition wall 25 into a heat exchanger chamber 22 and a compressor chamber 24. The heat exchanger chamber 22 is provided with an outdoor heat exchanger 16 and an outdoor blower 17, and the compressor chamber 2
4 is provided with a compressor 14 and an electrical equipment box 23. The electrical equipment box 23 is box-shaped and houses the inverter unit 10 incorporating a control circuit board, power transistors, etc. which are high heat generating components, and has a cooling air inlet hole 26 on one side and a cooling air outlet hole 27 on the other side. There are holes formed. Partition wall 2 between heat exchanger room 22 and compressor room 24
5 is provided with a ventilation hole 28 at a position lower than the cooling air outlet hole 27 of the electrical equipment box 23 or at a position shifted in the horizontal direction, and a ventilation hole 28 is provided at a position lower than the cooling air outlet hole 27 of the electrical equipment box 23 and at a position shifted from the cooling air exit hole 27 of the electrical equipment box 23 and the ventilation hole 28 of the partition wall 25. The space between the two forms a flow path for cooling air.
It is configured so that air does not flow in from any other than the cooling air outlet hole 27. Further, an outside air vent hole 29 is provided in the outer wall of the compressor chamber 24 at a position lower than the cooling air inlet hole 28 of the electrical equipment box 23 or at a position shifted left and right.

30 is a fan guard.

In the above configuration, when the blower 17 is rotated, the pressure in the heat exchanger chamber 22 becomes negative compared to the atmospheric pressure outside the outdoor unit main body 21, and the ventilation hole 28 provided in the partition wall 25 and the cooling air outlet hole 27 provided in the electrical equipment box 23 A pressure difference occurs between the cooling air inlet hole 26 and the outside air vent 29 provided on the outer wall of the outdoor unit main body 21, and the air is transferred from the pressure exchanger (atmosphere outside the main body 21) to the electrical box 23 for heat exchange with low pressure. It flows into the chamber 22 as shown by the arrow, and finally the blower 17 blows the air into the outdoor unit main body 2.
1 is ejected outside.

[Problem that the invention seeks to solve]

Conventional heat pump air conditioners are configured as described above, and the ICs currently in use.

The lower limit of the temperature guaranteed for normal operation of electronic components such as LSI is 110.
~20°C, but there is no guarantee for electronic components against low outside temperatures. Therefore, when the outside temperature is low, there are problems such as malfunction of the electronic components, resulting in abnormal operation or even destruction.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a heat pump type air conditioner that operates normally even at low outside temperatures.

[Means for solving problems]

The heat pump type air conditioner according to the present invention includes an electric heating device provided near electronic components, a device that detects the ambient temperature of the electronic components with a temperature detector, and controls the energization of the tM device.

[For production]

The air conditioner according to the present invention energizes the electric heating device installed near the electronic component when the ambient temperature of the electronic component falls below the guaranteed operating temperature of the electronic component to bring the ambient temperature of the electronic component within the guaranteed operating temperature range. and drive normally.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1. [k] is a perspective view showing a part of the outdoor electrical equipment box according to the present embodiment. 41 is a microcomputer control circuit board, and an electric heating device 32 is attached to this board 41 via an insulating material 31.A reed switch thermometer is attached to the 033ilt board 41, which has a temperature higher than the lower limit temperature that guarantees normal operation of electronic components. The switch is set to close when FIG. 6 is a control circuit diagram of the electric heating device 32, where 34 is an operation switch provided on the indoor side, and 35 is an electromagnetic contactor 35a.

35b is a normally open and normally closed contact, 36 is an AC power source, 37 is an indoor terminal block, 38 is an outdoor terminal block, and 39 is an isolation transformer.

Next, the operation of the above device will be explained with reference to the drawings.

When the ambient temperature of the board 41 is higher than the lower limit temperature of the normal operating temperature of the electronic component, the reed switch thermostat 33 is in a closed state. When the operation switch 34 is closed in this state, the electromagnetic contactor 35 is energized and the contact 35a is closed.
Therefore, the microcomputer control circuit 3 is energized via the isolation transformer 39, and the circuit 3 begins to operate. In addition, if the ambient temperature of the board 41 is lower than the lower limit temperature of the normal operating temperature of electronic components, the reed switch thermometer 3
3 is open, and even if the operation switch 34 is closed, the electromagnetic contactor 35 is not energized, and the contact 35b is closed.
The microcomputer control circuit 3 is not energized, but the electric heating device 32 is energized, and the substrate 41 is heated. When the heating reaches the lower limit temperature of the normal operating temperature or higher, the reed switch thermostat 33 closes, the electromagnetic contactor 35 is energized, the contact 35a is closed, the electric heating device 32 is de-energized, and the microcomputer control circuit 3 is energized. and starts operating.

In the above embodiment, when the ambient temperature of the board 41 is lower than the lower limit temperature of the normal operating temperature of electronic components, the electric heating device 32 is energized from the start of operation.
Regardless of whether the circuit board 41 is opened or closed, if the ambient temperature of the board 41 is lower than the lower limit temperature of the normal operating temperature of electronic components, the electric heating device 32
It is also possible to energize.

FIG. 7 shows, as described above, that the electric heating device 32
An embodiment is shown in which the operation switch 34 is connected to the electromagnetic contactor 35 and the i4 [thermal device 32
is provided in an independent circuit. In this example, if the ambient temperature of the board 41 is lower than the lower limit temperature of the normal operating temperature, the reed switch thermostat 33 is opened, the contact 35b is closed, and the electric heating device 1132 is energized, and during this energization, the operation switch 34 is closed. Even if the microcomputer control circuit 3 is turned on, the microcomputer control circuit 3 is not energized.

〔Effect of the invention〕

As described above, in the present invention, the electric heating device is provided near the electronic component, the ambient temperature of the 1' child component is detected by the temperature detector, and the energization of the electric heating device is controlled according to the output of the temperature detector. By energizing the electric heating device when the outside temperature is low, the ambient temperature of the electronic components can be raised to above the lower limit of the normal operating temperature of the electronic components.
A heat pump type air conditioner can be operated normally by preventing malfunction of electronic components.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a part of the outdoor electrical box according to the first embodiment of the present invention, the wJz diagram shows the configuration of the electrical system and refrigeration cycle system of the conventional device, and Figs. 3 to 5 respectively A cutaway plan view, a cutaway front view, and a cutaway side view of the outdoor unit of the conventional device, and FIGS. 6 and 7 are control circuit diagrams of the electric heating device according to the first and second embodiments of the present invention, respectively. 3... Microcomputer control circuit, 32... Electric heating device, 33... Temperature detector (reed switch thermo), 34... Operation switch, 35... Magnetic contactor,
41...Microcomputer control circuit board. It should be noted that the same reference numerals in the table indicate the same or equivalent parts.

Claims (3)

[Claims] (1) Equipped with an electric heating device installed near the electronic component to heat the electronic component, a temperature detector to detect the ambient temperature of the electronic component, and a means for controlling energization of the electric heating device according to the output of the temperature detector. A heat pump air conditioner characterized by: (2) The heat pump air conditioner according to claim 1, wherein the electric heating device is controlled to be energized regardless of whether it is in operation or not. (3) The heat pump air conditioner according to claim 1, wherein the electric heating device is controlled to be energized only during operation.