JPH028662A - Heat pump air conditioning system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] This relates to heating, cooling, and hot water supply heat pump equipment.

[Conventional technology]

FIG. 1 is a configuration diagram of a conventional heating/cooling/hot water heat pump device disclosed in, for example, Japanese Patent Application Laid-open No. 61-223463. In the figure, (1) indicates a compressor, a C21 four-way valve for switching between heating and cooling, (sa) and (sb) are outdoor heat exchangers.

(4) is an expansion mechanism, (5) is an outdoor heat exchanger, and (6a) and (6h) are the indoor heat exchangers (5a),
(3b) four-way valve (Denko valve installed on the connection side of 21, (7)
is a hot water storage tank, and a hot water tank heating coil (81
The heating coil (8) is connected in parallel to the series circuit of the indoor heat exchanger (3a) and the city valve (6a) via the electromagnetic valve (6b). +91 is the city water intake of the hot water storage tank (6), and Q[I is the three-way valve that switches the flow path of the high-temperature, high-pressure refrigerant into the hot water storage tank.

The inlet air blower (fat) is connected to the discharge side of the compressor (if) and the exchanger (8) is adjacent to the outdoor air blower (n1), respectively. In such a multi-room air conditioner, a plurality of indoor units 6a, for example, three indoor units 6a, are installed.
, 6b, 6a can be operated individually. When only the indoor unit 6a is in operation, the other indoor units 6b, 6a fully open the indoor expansion valves 7b, yc, and the indoor blowers 10b, 6a. 10C is also stopped. At this time, the capacity of the compressor 2 is controlled by an inverter or the like, and it is possible to operate the compressor 2 at a capacity corresponding to the number of operating indoor units.

Problems to be Solved by the Invention However, in the conventional example described above, the operation mode of the indoor unit 6 is set to be the same for all three rooms, and for example, even in winter, two rooms perform heating operation and one room performs cooling operation. The problem was that it could not meet the needs of simultaneous operation of heating and cooling.

In view of the above-mentioned problems, the present invention allows each indoor unit to freely perform heating and cooling operations in a multi-room air conditioner.

That is, the present invention provides a multi-room air conditioner that can perform different operations such as cooling operation and heating operation at the same time depending on the indoor unit.

Means for Solving the Problems The present invention connects an outdoor unit and a plurality of indoor units by a refrigerant branching unit, and the refrigerant branching unit includes a plurality of first expansion valves and second expansion valves in a number equal to or greater than the number of indoor units. .

It has a second two-way valve, a second two-way valve, and a two-way bypass valve, and the two-way bypass valve is connected between the outdoor expansion valve and each of the first two-way valves. A second expansion valve is connected, a four-way valve is connected to each second two-way valve, the first expansion valve is connected in parallel, the second expansion valve is connected in parallel, and the second expansion valve is connected in parallel.
The second two-way valve is connected to the indoor heat exchanger.

For production The effect of this technical means is as follows.

First, the cooling and heating operation capacities of each indoor unit are compared, and the operation mode of the outdoor unit is determined.

In other words, when (total cooling capacity of the indoor unit) ≧ (total heating capacity of the indoor unit), the outdoor unit enters the cold m operation mode, and (total cooling m capacity of the indoor unit) < (total heating capacity fi of the indoor unit). In this case, set the outdoor unit to heating mode. The case of each operation mode of the outdoor unit will be explained below.

Outdoor unit: In the case of cooling operation mode> V of the refrigerant branch unit connected to the indoor unit in heating mode
J direction IP: open, second two-way valve: closed, first expansion valve: fully closed,
2nd expansion valve: fully open, 2nd way valve connected to the indoor unit in cooling mode: closed, 2nd 2 way valve: open, 1st expansion valve: predetermined,
The second expansion valve: Fully closed, and the two-way bypass valve: Closed. At this time, the high-temperature, high-pressure refrigerant sent from the outdoor heat exchanger passes through the first valve connected to the indoor unit in heating mode, flows into the indoor heat exchanger, and radiates heat into the room (heating operation).
. After that, the refrigerant passes through the second expansion valve and is reduced in pressure by the first expansion valve connected to the indoor unit in cooling mode, becoming a liquid or two-phase state.The refrigerant absorbs heat from the room in the indoor heat exchanger (cooling operation), returns to the outdoor unit via the second two-way valve.

However, when the indoor unit is in cooling mode for all rooms, the two-way valve of the bypass circuit is opened, and the high-temperature, high-pressure refrigerant is depressurized by the first expansion valve connected to the indoor unit and becomes liquid or two-phase l1M. The cooled refrigerant is cooled by an indoor heat exchanger that absorbs heat from the room.
71 operation), the vinegar returns to the outdoor unit via the two-way valve.

Outdoor unit: For heating iIK transmission mode> The second direction of the refrigerant branch unit connected to the indoor unit in heating mode, *: Closed,
Second two-way valve: open, first expansion valve: predetermined, m2D tension 1'P:
The second valve is fully closed and connected to the indoor unit in cooling mode:
uFJ, the second two-way valve: closed, the first expansion valve: fully closed, the second expansion valve: predetermined, and the two-way bypass valve: closed. At this time, the high-temperature, high-pressure refrigerant sent from the outdoor heat exchanger passes through the second two-way valve connected to the indoor unit in heating mode, flows into the indoor heat exchanger, and radiates heat into the room (heating operation). After that, the refrigerant passes through the first expansion valve and is reduced in pressure by the second expansion valve connected to the indoor unit in cooling mode, becoming a liquid or two-phase state.The refrigerant absorbs heat from the room in the indoor heat exchanger (cooling operation). Then, it returns to the outdoor unit via the third valve.

A refrigerant circuit with a medium-side heat exchanger.

A water circuit that sends water heated by a water side heat exchanger that exchanges heat with the refrigerant side heat exchanger to a hot water storage tank using a pump.

Remaining hot water amount detection means for detecting the amount of remaining hot water in the hot water storage tank.

A control means that determines the Iy priority order of heating operation and hot water supply operation based on the accumulated time of heating operation by the refrigeration cycle and the amount of hot water remaining in the hot water storage tank, and performs control to limit each prioritized operation time to within a predetermined time. It is prepared.

[Effect]

The heat pump type air conditioning device in this invention is.

The priority order of heating operation and hot water supply operation is determined based on the accumulated time of heating operation by the refrigeration cycle and the amount of hot water remaining in the hot water storage tank, and control is performed to limit the operation time of each prioritized operation to within a predetermined time.

[Embodiments of the invention]

FIG. 1 is an overall configuration diagram of an air-conditioning/hot-water supply heat pump device showing an embodiment of the present invention, and in this figure, the same reference numerals as in FIG. 7 indicate the same or corresponding parts.

In the figure, 011 is a remote controller that outputs commands for cooling and heating operations, ■ is an air conditioning indoor unit that blows out conditioned air indoors, an outdoor unit that exchanges heat with outdoor air, a CIJij hot water exchange unit, and ■ is a hot water storage tank ( 71 is a bathtub which is an example of hot water utilization, ① to Gυ are refrigerant pipes, c (3 to (c) are water pipes, and (4) to (to) are control signal lines.

FIGS. 2 to 4 show the refrigerant circuit of the embodiment of the present invention shown in FIG. 1 and i! il control circuit diagram; FIG. 2 corresponds to cooling operation, FIG. 3 corresponds to heating operation, and FIG. 4 corresponds to hot water supply operation, and the solid arrows in each figure indicate refrigerant sweat.
The same reference numerals as in FIG. 7 indicate the same or equivalent parts, (4G is a control circuit that combines the heating and cooling operation signal generated in the remote controller 2+1 and the temperature sensor installed in the hot water tank (7) to detect the hot water temperature. Depending on the ω signal, the operation mode will be one of cooling, heating, and hot water supply. (1) is a compressor that compresses refrigerant and discharges high-temperature, high-pressure refrigerant gas, and (2) is this compressor + 1
The flow of the refrigerant gas discharged from the control circuit 14 [1] controls the flow of the refrigerant gas to the outdoor heat exchanger +51 or the indoor heat exchanger (
3a) and a four-way switching valve for switching the refrigerant to flow to either one of them and from the other to return to compressor T+1.

(6a) is a solenoid valve that opens and closes the addition of refrigerant to the outdoor heat exchanger (3a) according to the command of control circuit +4 (l);
) is also the refrigerant side heat exchanger for hot water supply (a of the refrigerant to 411).
44 is an indoor fan for the indoor heat exchanger (3a), (4S is an outdoor fan for the outdoor heat exchanger (5), (4) is an expansion mechanism, and 4 is a water circuit pump, uz
This is a water side heat exchanger for Fi hot water supply.

During cooling operation, turn off the four-way switching valve (2) and turn off the solenoid valve (6a).
), close the solenoid valve (6b), and turn on the indoor blower I and the outdoor blower S, so that the refrigerant flows as indicated by the solid arrow in FIG. 2.

Also, when warming up y+h, the four-way switching valve 12) is turned on, and the 31st
As shown by the solid line arrow of %l, the operation is performed using the refrigerant circulation path opposite to that of the cooling operation.

Furthermore, during hot water supply operation, the four-way switching valve (2) is turned on.

Close the solenoid valve (6a), open the 1fs valve (6b), turn on the outdoor fan (c), circulate the refrigerant as shown by the solid arrow in Figure 4, and operate the pump to remove the refrigerant for hot water supply. Side heat exchanger I411 and hot water supply water 1111/heat exchanger i4
A hot water supply operation is performed to boil the water in the hot water storage t1!1 (71) by heat exchange of step 2.

FIG. 5 is a block diagram of a control circuit according to an embodiment of the present invention (when a one-chip microcomputer (6o) is used for 4G).

Inside the one-chip microcomputer (6o) are an interrupt controller (61) that controls interrupt operations generated externally and internally, a timer (BS) that controls time by dividing the signal of an external oscillator (62), and a system controller. An instruction decoder (65) that extracts and decodes and executes instructions from the ROM (64) in which programs are stored, an ALU (arithmetic logic unit, arithmetic unit) (66), a RAM (67) that stores and temporarily saves data, It is provided with a configuration having normal basic functions such as an input/output capo (6B) for inputting and outputting digital signals to and from the outside, and an A/D conversion port (69) for inputting external analog voltages.

In this example, the hot water storage tank is divided into six equal parts, and a thermistor (46
) to (50) are attached. Each thermistor is inputted to an A/D conversion baud (bq) of a one-chip microcomputer (60) via a voltage conversion circuit (71).

The heating and cooling operation command from the remote control +211 is input to the input/output capo (68) of the one-chip microcomputer (60),
Actuator for each operation mode, compressor C1), four-way valve (2), pump +43. Solenoid valve (6a), (6b)
The on/off state of the input/output port (6B) is outputted from the output port of the input/output port (6B) and operated via the Citri bar circuit (70).

ROM of one-chip microcomputer (60) with the above configuration
An embodiment in which an operation mode determination program is included in (64) will be described with reference to the flowchart of FIG.

This program is a subroutine for determining the operation mode of heating and hot water supply operations in the air conditioning/heating and hot water supply system, and does not determine the priority between cooling and hot water supply operations. This subroutine only sets and resets the operation mode flags corresponding to each operation mode of heating and hot water supply, and is used as necessary in the main routine. In the main routine, control is performed to execute cooling, heating, and hot water supply operations, mainly based on actuator operation, based on the states of these operation mode flags. Further, the cooling/heating operation command from the remote controller I21 is processed by another subroutine and outputted as setting/resetting of the heating request flag. Thermistor 14
The voltage value of 1i-ψ is converted into a temperature value in a temperature conversion subroutine.

In this example, the capacity of the hot water tank is set to 3001, and the sensor position of the hot water tank is set as hot water when the water temperature is above a certain level.

50/, 100/, 1507.200/, 25M
It is judged as the amount of remaining hot water.

First, when this sapruch/is called, the amount of remaining hot water is 25.
It is determined whether the value is 01 or more (80). This is done by checking whether the water in the hot water storage tank is boiling. If it is, reset the hot water supply related flags. 81) Check to see if there is a heating request flag from the remote control (82). If there is a heating request flag, the heating flag is set to request heating operation from the main (85), and if there is no heating flag, the heating flag is reset (84).

If the hot water tank (7) is not fully heated.

It is checked whether the hot water supply stop flag for limiting the hot water supply operation time is set (85). If the hot water supply stop flag has not been set, it is subsequently checked whether the hot water supply flag, which is a hot water supply operation request for the main, is set (86). If the hot water flag is not set,
The future hot water supply operation time is set according to the amount of hot water remaining in the hot water storage tank (7), and the hot water supply operation is restricted. The remaining amount of hot water is 200/ and 150/ respectively.

100/, 50/ or more 87), (
8B), (89).

(90) Start the timer for hot water supply operation time corresponding to each (91), (92), (95),
(94), (95). In this example, 'h > T2
>T3 >T4 >'r5 The smaller the amount of remaining hot water, the longer the hot water supply operation time. At the same time as starting the hot water supply operation timer, the hot water supply flag is set, the heating flag is reset, and a time-limited hot water supply operation is determined (96).

〔Effect of the invention〕

According to the present invention, there is provided a refrigerant circuit having a refrigeration cycle that performs heating and cooling using a refrigerant compressor, and a refrigerant-side heat exchanger for heat pump type hot water supply connected to the refrigeration cycle.

A water circuit that uses a pump to send water heated by the water side heat exchanger that exchanges heat with the refrigerant side heat exchanger to the hot water storage tank.

Remaining hot water amount detection means for detecting the amount of remaining hot water in the hot water storage tank.

Control means is provided for determining the priority of heating operation and hot water supply operation based on the accumulated time of heating operation by the refrigeration cycle and the amount of hot water remaining in the hot water storage tank, and controlling to limit each prioritized operation time to within a predetermined time. Because of this configuration, the priority of heating operation and hot water supply/hot water operation can be changed depending on the cumulative heating operation time and the amount of remaining hot water, so there is no need to run out of hot water, and the temperature drop in the heated room is minimized. can be kept to a minimum.

If the hot water supply flag is set, a control for monitoring the hot water supply operation time is used to check whether the hot water supply time timer has timed out (97). If the time has not expired, continue hot water supply operation.

I don't even ask about flag manipulation. When the time has elapsed, it is checked whether there is a heating request flag (98), and it is determined whether to interrupt the hot water supply operation and switch to the warm MAN mode. If the heating request flag is set, the heating flag is set, a heating time limit timer is started, a hot water supply stop flag is set (99), and the hot water supply flag is reset (100). This is an interruption of the hot water supply operation, and a time-restricted heating operation is performed while the hot water supply operation is requested. In addition, in this state, in order to monitor the heating operation time, it is checked whether the heating time timer has exceeded (101), and when the timer has exceeded, the hot water supply stop flag and the heating flag are reset (102) to enable hot water supply operation.

As described above, the operation modes of the heating operation and the hot water supply operation are determined, and the heating/hot water supply edge turning operation with a time limit is realized.

Also, in this example, the heating operation time limit is treated as a fixed value, but it is clear that it can be varied depending on the amount of remaining hot water.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. Figure 2 is a refrigerant/control circuit diagram during cooling. Figure 3 is a refrigerant/control circuit diagram for heating, Figure 4 is a refrigerant/control circuit diagram for hot water supply, Figure 5 is a block diagram of the control circuit, and Figure 6 is a heating/hot water supply priority determination subroutine. Fig. 7 is a refrigerant/control circuit diagram of a conventional heating/cooling/hot water heat pump device. In the figure, (1) is a compressor, (71 is a hot water storage tank, (4G is a control circuit, (4D is a refrigerant side heat exchanger for hot water supply, i4z is a water side heat exchanger for hot water supply, and US-ψ is a temperature sensor. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] A refrigerant circuit having a refrigeration cycle that performs air conditioning and heating using a refrigerant compressor, and a refrigerant-side heat exchanger for heat pump hot water supply connected to the refrigeration cycle, a water side that exchanges heat with the refrigerant-side heat exchanger. A water circuit that sends water heated by a heat exchanger to a hot water storage tank using a pump, a remaining hot water amount detection means that detects the amount of hot water remaining in the hot water storage tank, and heating based on the accumulated time of heating operation by the refrigeration cycle and the amount of hot water remaining in the hot water storage tank. A heat pump type air-conditioning/heating device that is equipped with a control means that determines the priority order of operation and hot water supply operation, and controls the operation time of each prioritized operation to be limited within a predetermined time.