JPH0213761A - Refrigerant heating type cooling and heating apparatus - Google Patents

Abstract

PURPOSE:To make refrigerant retrieving operation upon starting heating operation unnecessary and improve the rise-up characteristics of the title device by a method wherein refrigerant retrieving operation is effected after a refrigerant heating command signal, outputted under a given condition upon finishing the heating operation, is outputted and, thereafter, the windings of a motor for a compressor is heated. CONSTITUTION:When a given time has elapsed after finishing heating operation and a winding heating command signal is kept outputted from an indoor machine to an outdoor machine under a condition that a predetermined condition such as the case in which an indoor temperature has become lower than a set temperature or the like is satisfied, refrigerant retrieving operation is effected. In this case, the title device is operated for a given period of time under a condition that a four-way changeover valve 2 is switched into heating mode and a two-way valve 10 is closed, whereby the refrigerant, stagnating in an outdoor side heat exchanger 3, is retrieved into a heating circuit. Thereafter, the windings of a motor for a compressor 1 is heated.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a refrigerant-heated air-conditioning device.

(Prior art) Fig. 4 is a diagram showing a refrigerant heating cycle, and shows the compressor 1
An outdoor heat exchanger 3, a pressure reducing device 4, a check valve 5, an expansion valve 6, and an indoor heat exchanger 7 are sequentially connected in an annular manner through a four-way switching valve 2. Note that the check valve 5 is provided so that the flow direction of the refrigerant during cooling is in the forward direction. Furthermore, a check valve 8 is provided between the four-way switching valve 2 and the suction side of the compressor 1. Further, a heating pipe line 9 is branched from between the check valve 5 and the expansion valve 6, and is connected to the suction side of the compressor 1 on the downstream side of the check valve 8 via a two-way valve 10 and a refrigerant heater 11. It is connected. Furthermore, a bypass pipe line 12 for heating capacity adjustment is connected between the discharge side of the compressor 1 and the upstream side of the two-way valve 10. This bypass line 1
2 is provided with an on-off valve 13 and a pressure reducing device rR14. On the other hand, a gas solenoid valve 1 is located near the refrigerant heater 11.
5 and a proportional valve 16, a burner 17 whose gas supply amount is adjusted is provided.

During cooling operation, the refrigerant discharged from the compressor 1 passes through the four-way switching valve 2 and is sent to the outdoor heat exchanger 3, where it is condensed. The air is depressurized and flows into the indoor heat exchanger 7, where it expands to cool the room, and then returns to the compressor 1.

In addition, during heating operation, the refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 7 via the four-way switching valve 2,
There, the heat is radiated to heat the room, and then the refrigerant passes through the heating pipe 9 and is heated by the burner 17 in the refrigerant heater 11 before being returned to the compressor 1. In addition, when reducing the heating operation capacity, the on-off valve 13 provided in the bypass pipe 12 is opened and the refrigerant discharged from the compressor 1 flows into the upstream side of the two-way valve 10, thereby increasing the indoor heating capacity. can be lowered.

Here, at the start of heating operation, the outdoor heat exchanger 3
Since some refrigerant remains in the heating circuit, a refrigerant recovery operation is performed to return this refrigerant to the heating circuit. That is, at the start of heating operation, the operation is performed for a certain period of time with the four-way switching valve 2 in the heating mode and the two-way valve 10 in the closed state, and the refrigerant remaining in the outdoor heat exchanger 3 is returned to the heating circuit. After that, by opening the two-way valve 10 and igniting the burner 17, a substantial heating operation with heating capability is started.

In addition, when a certain period of time has passed after heating operation ended and the indoor temperature has fallen below a certain set temperature, winding heating is performed to heat the windings of the motor of the compressor 1 from the indoor unit (not shown). A command is output and the winding is heated. As a result, the refrigerant remains warmed to some extent even when the heating operation is stopped, so that the rise time when the next heating operation is started can be shortened.

(Problems to be Solved by the Invention) However, at the start of the heating operation, a refrigerant recovery operation without heating capacity is performed, so there is a problem that the start-up characteristics of the heating operation are poor. Further, immediately after refrigerant recovery, since the amount of refrigerant circulation is small, there is a possibility that the refrigerant heater after ignition becomes abnormally high temperature.

The present invention was made in view of the above-mentioned problems.
It is an object of the present invention to provide a refrigerant-heating type air-conditioning device that starts heating operation without performing refrigerant recovery operation at the time of starting heating.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a refrigerant-heating air-conditioning device in which a winding heating command signal for heating the windings of a compressor motor is output under certain conditions after heating operation ends. The present invention is characterized in that after the winding heating command signal is output, a refrigerant recovery operation is performed, and then the winding heating is performed.

(Function) When the heating operation ends and a certain period of time has elapsed and the indoor temperature falls below a certain value, a winding heating command signal to heat the windings of the compressor motor is output. After this winding heating command signal is output, a refrigerant recovery operation is performed. After that, the winding is heated. In this way, since the refrigerant recovery operation is performed after the end of the heating operation, there is no need to perform the refrigerant recovery operation at the start of the heating operation, and the start-up characteristics at the start of the heating operation can be improved.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

The refrigerating cycle of the refrigerant-heating type air-conditioning device according to the present invention has a configuration similar to that shown in FIG.
A detailed explanation thereof will be omitted.

FIG. 1 is a block diagram of a control device for a refrigerant heating type air-conditioning device according to the present invention. The serial signal output from the indoor unit 18 is sent to a serial circuit 20 provided in the outdoor unit 19.
The data is input to the central processing unit 21 via the . In addition, outdoor unit 1
9, the thermistor 22, wind pressure switch 23,
Respective information signals from the flame detection circuit 24 and the overheat prevention thermostat 25 are input to the central processing unit 21 . The information signal input into this central processing unit 21 is
Processed within 1. These processed information signals sequentially pass through the custom LSI 26 and inverter 27 to the compressor 1, pass through the driver 28 to the electronic expansion valve 6, pass through the constant current circuit 29 to the proportional valve 16, and pass through the power coupler 30 to the four directions. It is output to the switching valve 2, through the power coupler 31, to the two-way valve 10, and through the relay 32 to the gas solenoid valve 15, thereby controlling the refrigeration cycle.

FIG. 2 shows a flowchart of the operation of the refrigerant heating type air-conditioning device according to the present invention. The outlet of the heating and cooling device is plugged in (A), and the heating and cooling device is initialized (B). Next, after a certain period of time has passed after heating operation has ended, a winding heating command signal is output from the indoor unit to the outdoor unit when a predetermined condition is met, such as when the indoor temperature falls below a certain set temperature. It is necessary to judge whether the winding heating command signal is being output or not.C), and if the winding heating command signal is not being output, it is necessary to further judge whether the operation switch is in the ON state.D
), if it is in the ON state, it is further determined whether or not it is in the heating operation mode.E), if it is in the heating operation mode, the heating operation is performed (F), and if it is not in the heating operation mode, the cooling operation is performed. Become (G). Here, while heating operation and cooling operation are being performed, feedback is given to D,
Determine whether the operation switch is in the ON state. In this D, if the operation switch is in the OFF state, C
is fed back to determine whether the winding heating command signal is being output again. Here, if the winding heat command signal is being output, first determine whether or not the refrigerant recovery operation has been performed (H), and if the refrigerant recovery operation has not been performed, perform the refrigerant recovery operation. (1). That is, the operation is performed for a certain period of time with the four-way switching valve 2 in the heating mode and the two-way valve 10 in the closed state, and the refrigerant that has accumulated in the outdoor heat exchanger 3 is recovered into the heating circuit. This refrigerant recovery operation is for a set period of time, so J determines whether or not the refrigerant recovery operation has been performed for the set time (J), and after the set time has elapsed, a flag indicating that the refrigerant has been recovered is set ( K). After that, I gave feedback to H.
It is determined whether the refrigerant recovery operation has been performed again. Here, when the refrigerant recovery operation is performed, the winding is heated (L), and then a signal is input to D, and it is determined whether the operation switch is in the ON state.

In this way, after the refrigerant heating command signal is output under certain conditions at the end of the heating operation, the refrigerant recovery operation is performed, and then the windings of the motor of the compressor 1 are heated. There is no need to perform a refrigerant recovery operation at the start of heating operation, and the start-up characteristics at the start of heating operation are improved.

In addition, Fig. 3 shows that when heating operation starts, combustion control is not performed using a temperature sensor, etc., but according to a preset time.
It is a flowchart when combustion control of a burner is performed. That is, the heating operation is started (A), and the burner is ignited (B).

At this time, the burner performs forced strong twist firing operation (C), and starts the operation time t1 after this forced strong combustion (D)
. Then, the operating time t of this forced strong twist firing operation is compared with the forced strong combustion set time T1 (E), and the burner performs strong combustion until t1≧TI. Here, when t1≧T1, the forced strong combustion is switched to forced weak combustion (F), and at the same time, the operation time t2 of this forced weak combustion is started (G). Then, the operating time t of this forced weak combustion operation is compared with the forced weak combustion set time T2 (H), and the burner performs weak combustion until t2≧T2. Here, when t2≧T2, the forced weak combustion operation switches to the normal strong/weak combustion operation (
1).

In this way, strong combustion is forcibly performed at the start of the heating operation, so misfires can be prevented at the start of the operation. It can also be used in the event of ignition.

Further, until the amount of refrigerant in the refrigeration cycle becomes stable, weak combustion is forcibly performed, so that release at the start of combustion can be prevented.

〔Effect of the invention〕

As described above, the present invention provides, after the refrigerant heating command signal is outputted under certain conditions at the end of the heating operation,
By performing the refrigerant recovery operation and then heating the windings of the compressor motor, there is no need to perform the refrigerant recovery operation at the start of the heating operation, and the start-up characteristics at the start of the heating operation are improved. Since the refrigerant recovery operation is performed h after the refrigerant heating command signal is output, the refrigerant is recovered in the heating cycle when heating operation starts, and the refrigerant heater can be prevented from becoming abnormally high temperature, etc. play.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of the refrigerant heating type air conditioning system according to the present invention, Fig. 2 is a flow chart of the operation of the refrigerant heating type air conditioning system according to the present invention, Fig. 3 is a flow chart of burner combustion control, and Fig. 4 is a refrigeration cycle diagram of a refrigerant heating type air-conditioning device. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Four-way switching valve, 3... Outdoor heat exchanger, 4... Pressure reducing device, 5... Check valve, 6...
- Electronic expansion valve, 7... Indoor heat exchanger, 8... Check valve, 9... Heating pipe line, 10... Two-way valve, 11...
Refrigerant heater, 12... Bypass pipe line, 13... Open/close valve, 14... Pressure reducing device, 15... Gas solenoid valve, 16
...Proportional valve, 17...Burner, 18...Indoor unit,
19...Outdoor unit, 20...Serial circuit, 21...
・Central processing unit, 22...Thermistor, 23...Wind pressure switch, 24...Flame detection circuit, 25...Overheat prevention thermostat, 26...Custom LSI, 27...Inverter, 28...・Driver, 29...constant current circuit,
30...Power coupler, 31...Power coupler, 3
2...Relay. Applicant's agent Mr. Sato Figure 2

Claims (1)

[Claims] In a refrigerant-heating air-conditioning system in which a winding heating command signal is output to heat the windings of a compressor motor under certain conditions after the heating operation ends, the refrigerant recovery operation is started after the winding heating command signal is output. 1. A refrigerant-heating type air-conditioning and heating device characterized in that the winding is heated and then the winding is heated.