JPS63197844A - Operation control system for air conditioner - Google Patents

Abstract

PURPOSE:To enable elimination of a contact for opening and closing a compressor on the outdoor side, by a method wherein, from flame failure signal fed to a power line, the flame failure state of a coolant is detected, an a contact for opening and closing a compressor on the indoor side is brought into an OFF-state to stop a compressor on the indoor side. CONSTITUTION:In order to feed flame failure state signal to a power line 33, through which a commercial source is fed from an indoor machine 1 to an outdoor machine 21, during flame failure of a coolant heater located on the outdoor machine 21 side, a bi-directional switch element 30 connected to the power line 33 is driven according to the combustion state of the coolant heater. From a flame failure signal fed to the power line 33, the flame failure state of the coolant heater is detected by means of a D.C. voltage obtained through current-voltage converting means 10, 11, 12, and 13 on the indoor machine 1 side, and by bringing a contact 8 for opening and closing a compressor located on the indoor machine 1 side into an OFF-state, a compressor 23 on the outdoor machine 21 side is stopped. This constitution enables elimination of a contact for opening and closing a compressor on the outdoor machine 21 side to prevent chattering of a contact and to improve economical efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is an air conditioning system that stops a compressor when a refrigerant heater stops due to misfire or non-ignition when performing heating operation with an air-source heat pump air conditioner. This invention relates to an operation control device.

BACKGROUND ART FIGS. 4 and 5 show configurations that have been attempted in the past. 4 and 5 show schematic diagrams of the indoor and outdoor electrical system of the air conditioner for both cooling and heating, and only the parts related to the present invention will be explained.

In FIG. 4, 50 is a compressor opening/closing contact placed on the indoor side, 51 is a compressor opening/closing contact placed on the opposite side,
52 is a compressor, and after the outdoor unit control unit 53 detects misfire and non-ignition, the operating contact 54 is opened, thereby canceling the operating voltage applied to the operating coil 55 of the compressor opening/closing contact 51, and the compressor 52 is being stopped.

56 is a commercial power source.

In addition, in FIG. 5, a B contact is used as the compressor opening/closing contact 51 installed on the outdoor side, and the outdoor unit control unit 53
After misfire and non-ignition are detected, the compressor opening/closing contact 51 is turned on to cut off power supply to the compressor 52.

Problems to be Solved by the Invention First, the necessity of stopping compression in the event of misfire or non-ignition will be briefly explained with reference to the third drawing. In FIG. 3, 57 is an indoor unit, 58 is an outdoor unit, n1A is an indoor heat exchanger (57), and B is a refrigerant pipe. C9D is a pressure switch, E is a four-way valve, F, G.

H is a check valve; 1. J is an accumulator, K and L are two-way valves, which are installed in the refrigerant pipe B. M is the overload of the compressor 52, 1! Electric appliances, O is outside! XM58 outdoor heat exchanger,
P is a xepillary tube installed in refrigerant pipe B, R,
S is gas solenoid valve, King is refrigerant heater, ■ is wind pressure switch,
W is a gas pipe. Further, the solid line in FIG. 3 indicates the flow of refrigerant during heating operation, and the broken line indicates the flow of refrigerant during cooling operation.

In the refrigerant cycle with the above configuration, in order to heat the refrigerant during heating operation, the refrigerant heater T is arranged so that the refrigerant piping B is arranged around the external heat source, and the refrigerant is warmed and heat exchanged. If the system is stopped due to a lack of oxygen or oxygen, the evaporation effect caused by heating the refrigerant will stop, and heat exchange will no longer occur. On the other hand, the refrigerant liquid that has circulated through the refrigerant heater T is sucked into the compressor 52, causing a liquid hammer, which shortens the life of the compressor 52, and makes it more likely that failures that may lead to damage to the compressor 52 will occur. Become. To prevent this, it is necessary to stop the compression 1152 in the event of a misfire or non-ignition.

For example, in the device shown in FIG. 4, fluctuations in the commercial power supply 56 supplied to the operating coil 55 of the compressor opening/closing contact 51, i.e., excessive voltage fluctuations occur when the compressor 52 is started.
The line voltage drops due to the J current, the voltage across the operating coil 55 decreases, and the opening/closing contact 51 is likely to cause tearing.

In addition, in the device shown in Fig. 5, a B contact is used as the pressure A machine σU closing contact 51, but when used as a switch for controlling large currents, it is difficult to use in terms of contact life. 8. Poor reliability.

The present invention solves the above-mentioned problems, and aims to provide an air conditioner operation control device that can eliminate the compressor opening/closing contact on the outdoor unit side.

Means for Solving the Problems In order to solve the above problems, the present invention provides a connection between the power line that supplies commercial power from the indoor unit to the outdoor unit, such as when the refrigerant heater located on the outdoor unit side misfires. In order to send out a signal indicating the misfire condition, the bidirectional switching element connected to the power line is driven according to the combustion condition of the refrigerant heater, and the misfire A sent out to the power line is sent from the indoor side to the The misfire state of the refrigerant heater is detected by the DC voltage obtained through the current-voltage conversion means, and the pressure m'o I:i switching contact placed on the indoor side is turned OFF and the outdoor side 1 is turned off. The compressor is configured to stop f:.

Operation With the above configuration, the contact for opening and closing the compressor on the outdoor unit side can be removed, eliminating the jitter of the contact as shown in the conventional example, and also eliminating the need for a switch for controlling power for 16 people to open and close the compressor. It is also economically superior.

Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a lightning system diagram showing one embodiment of Komyo Ki. 43 in FIG. 1, 1 is the indoor unit n, 2 (commercial power on/off switch), 3 is the indoor unit control unit that controls the indoor unit 1, and this indoor group control unit 3 is the one that controls the commercial power on/off switch 2. It is connected to a commercial power source 4 via the power supply.

5 is for indoor fan variable speed nnr'! Reference numerals ', 6, and 6 are indoor fan motors, which are connected in series to a commercial power source 4 via a commercial power on/off switch 2. 7 is indoor fu7・
This is the start-up capacitor. 8 is a contact for opening and closing the compressor, 9
are switch contacts for switching between cooling and heating modes, each of which is connected in parallel to a commercial power source 4 via a commercial power on/off switch 2. 10 is a rectifier used to detect the combustion state of the refrigerant heater on the outdoor b1 side, and is connected to the cooling/heating mode switching switch contact 9 via the current R11 limiting resistor 11; 12, constitutes current-voltage conversion means together with an integrating circuit consisting of a resistor and a capacitor. 14 is a first comparator that compares the output voltage of the integrating circuit 13 with a reference voltage indicating the combustion state; 15 is a second comparator that compares the output voltage of the integrating circuit 13 with a reference voltage indicating combustion stoppage or a misfire state. Both outputs are input to the outdoor unit control section 3. 16 is a thermistor for detecting room temperature, and 17 is an operation input section, each of which is connected to the outdoor unit control section 3.

21 is an outdoor unit, which includes an outdoor fan [-ta 22 and a compression F3M2
3 are connected to the compressor opening/closing contacts 8 of the indoor station 1 via power lines 31, respectively. 24 is a capacitor for outdoor use. 25 is a four-way valve for switching I and Q of the cooling/heating refrigeration cycle, and is connected to the cooling/heating mode switching switch contact 9 of the indoor unit 1 via the electric power FA 32.

Reference numeral 26 denotes an outdoor single control unit that controls the outdoor fi 1, and is supplied with power through a power line 32. 27 is a combustion detector for detecting the combustion state of a cold kettle heater (not shown), and 28 is a refrigerant temperature detection thermistor which is also attached to the main body of the refrigerant heater, and each is connected to the outdoor unit control section 26. There is. 2
9 is a pulse transformer connected to the outdoor unit control section 26;
Bidirectional switching bundler 30 connected to its secondary side
is connected to the rectifier 10 of the indoor unit 1 via the electric power 133. 34 is electricity! l! 331 to 33 are power lines to which voltages having different polarities are applied.

Figure 2 shows the waveforms of the main parts, (a) is the voltage waveform of the commercial power supply 4, and (b) is the voltage waveform of the outdoor unit control section when combustion continues normally in the refrigerant heater (not shown). 26 shows the main current waveform of the bending bidirectional switch element 30 when the bidirectional switch bundler 30 is driven via the pulse transformer 29. (C) shows the main current waveform of the refrigerant temperature detection thermistor 28 attached to the refrigerant heater body. When the combustion of the refrigerant heater is stopped in order to prevent the temperature TR of the refrigerant heater body using the detection mtα, the outdoor unit control unit 26 sends only a half-wave of the commercial power supply 4 via two pulse transformers. (d) shows the main current waveform of the bidirectional switch element 30 when the bidirectional switch element 30 is driven so that the refrigerant heater misfires or flames break out. The main current waveforms of the bidirectional switch element 30 when the combustion detector 27 detects that combustion has stopped are shown. As shown in FIG. 2, when the refrigerant heater has stopped combustion, the bidirectional switch element 30 is controlled to be non-conductive.

The above-mentioned operation occurs during heating operation when the cooling/heating mode switching contact 9 is turned off, as shown in FIG.
By passing the current shown in FIGS. 2(b) to 2(d) through the detection circuit consisting of
The DC voltage obtained through 3 appears at terminal 18. Therefore, the DC voltage induced at the terminal 18 by the combustion state of the refrigerant heater as shown in FIG. 2 is as follows: During normal combustion, fb) in FIG. Fig. 2 (C)... [2 (V) At the time of misfire, Fig. 2 (
d)...[3(ν). For example, the above [El,
When J3 is in E2 and El, there is a magnitude relationship of El>E2>El. 1 The second comparator 15 is
In order to detect and overturn the misfire of the refrigerant heater with the voltage of 33, the voltage of E2>Reference voltage for misfire detection>Ex is adopted as the standard for misfire detection of 15. Ru. Second comparator 1! ) The misfire state of the refrigerant heater detected at is input to the control unit 3,
Newly turn off the compressor opening/closing contact 8 on the indoor □ control unit 31.
F spoon, ffIIJ to make one combustion indicator flash.
It will be tilled.

In addition, the first comparator 14 is connected to the
As the reference voltage for combustion detection of the comparator 14, a voltage of El>reference voltage for combustion detection> [2 is adopted. The burning state of the refrigerant heater detected by the first comparator 14 is input to the indoor unit control section 3, and the indoor unit control section 3 newly controls the combustion indicator 19 to turn on and off. .

Effects of the Invention According to the present invention, the combustion state of the refrigerant heater disposed in the outdoor unit is detected, and the combustion state signal of the refrigerant heater as described in 11, for example, the combustion The indoor unit side detects the combustion and misfire signal q sent from the outdoor unit to the power line, and when a misfire is detected, the indoor unit Since the compressor opening/closing contact located on the side is controlled to 0 [" and the compressor is stopped, the pressure II 6 compressor opening/closing contact on the outdoor unit side can be deleted, so it is not possible to It eliminates contact chatter, and also eliminates the need for a high-power control switch that opens the compressor, resulting in excellent continuity.In addition, the combustion status of the outdoor unit, i.e. during combustion and misfire, is improved. It has excellent effects such as being able to monitor the same configuration indoors on the indoor side.

[Brief explanation of the drawing]

Fig. 1 is an electrical system diagram of the operation control station of the air conditioning group, without showing an embodiment of the present invention, Fig. 2 is a waveform diagram of the main parts of Fig. 1, and Fig. 3 shows the operation of the air conditioner. The schematic configuration diagrams to be described, FIGS. 4 and 5, are schematic electrical system diagrams of a conventional air conditioner. 1... Indoor unit, 3... Indoor unit 1-control unit, 6...
Indoor fan motor, 8... Compressor opening/closing contact, 9...
- Cooling/heating mode switching switch contact, 10... Rectifier, 11... Current limiting resistor, 12... Photocoupler, 13... Integrating circuit, 14... First comparator, 15
...Second comparator, 19...Combustion indicator, 21...
- Outdoor unit, 22... Outdoor fan motor, 23... Compression separate, 25... Four-way valve, 26... Outdoor unit control section, 2
7... Combustion detector, 29... Pulse transformer, 30
...Bidirectional switching element. r]X,? ,' Figure 2, C □ 4th Figure Evening Figure

Claims (1)

[Claims] 1. At least a compressor, an outdoor fan, a four-way valve, a pressure reducing mechanism, an outdoor heat exchanger, and a refrigerant heater for heating the refrigerant are arranged on the outdoor unit side, and at least an indoor heat exchanger and an indoor fan are arranged on the indoor unit side. , a first power line that supplies power from the indoor unit side to the outdoor unit side compressor and outdoor fan; From the machine side, connect the four-way valve to the outdoor unit side via the cooling/heating mode switching switch contact.
Power is supplied to the bidirectional switch element on the outdoor unit side from the second power line that supplies power to the outdoor unit control unit and the contact point of the cooling/heating mode switching switch on the indoor unit side via the current-voltage conversion means. A fourth power line that applies a voltage with a polarity different from the voltage applied to the first, second, and third power lines is connected to a third power line that supplies the power, and the third power line is connected to the outdoor unit. means for driving a bidirectional switch element on the outdoor unit side according to the combustion state of the refrigerant heater via the outdoor unit control section in order to send out a combustion signal indicating the combustion state of the refrigerant heater in which the refrigerant heater is heated; and detecting the combustion state of the refrigerant heater on the outdoor unit side based on the DC voltage obtained from the refrigerant heater combustion signal sent from the outdoor unit side via the current-voltage conversion means on the indoor unit side. The compressor is configured to include a first comparator on the indoor unit side and a second comparator on the indoor unit side that detects a misfire state of the refrigerant heater, and to stop the compressor in response to a misfire signal output from the second comparator. air conditioner operation control device.