JPS6089643A - Multi-chamber type air cooling heat pump system air conditioner - 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 Field of the Invention The present invention relates to a multi-chamber air-cooled heat pump air conditioner, and particularly to its refrigerant control.

Conventional configuration and its problems Conventionally, a multi-room heat pump type air conditioning system in which multiple indoor units are connected to one outdoor unit uses refrigerant control as shown in Figure 1, for example. . 1 is an outdoor unit, 2.3 is an indoor unit, 4 is a compressor, 5 is a four-way valve, 6 is an outdoor heat exchanger, 7
8.9 is fully open during cooling and acts as an expansion valve during heating; 8.9 acts as an expansion valve during cooling;
Electric expansion valve that opens fully or acts as a solenoid valve during heating, io and ii are solenoid valves, 12.13 is a pressure equalization check valve, 14.15 is a pressure equalization key 1z pillar tube, IG,
17 is a check valve for injection, 18.19 is a key 11 pillar tube for injection, 20, 21.22
are temperature sensors attached to each tube 23□24.25, 2G is a pressure sensor, 27 is a strainer, 28 is a heating injection cylinder tube 1.29.
30 is a check valve provided in the bypass circuit of the electromagnetic valves 10 and 11.

Conventionally, such a circuit was configured, and during cooling, the liquid refrigerant condensed in the outdoor heat exchanger 6 passes through the electric expansion valve 7 which is controlled to be fully open, and then passes through the electric expansion valve 8 corresponding to the indoor units 2 and 3. , 9 are controlled by a temperature sensor 20.21 and a pressure sensor 26 to obtain an appropriate amount of refrigerant circulation to the indoor unit 2.3 which acts as an evaporator.

Also, during heating, the liquid refrigerant condensed by the four-way valve 5, the solenoid valves io and ii, and the indoor units 2 and 3 that act as condensers passes through the electric expansion valves 8 and 9, and passes through the humidity sensor 22 and pressure sensor 2.
G and t[Ill M, thereby obtaining an appropriate amount of refrigerant circulation to the outdoor heat exchanger 6 which acts as an evaporator.

However, such a circuit requires a total of three electric expansion valves: an electric expansion valve 8.9 for cooling and an electric expansion valve 81 for heating. It is necessary to control the system separately. These controls are very complicated, and the electric expansion valve is expensive, so the manufacturing cost is also high.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a multi-chamber air-cooled heat pump type air conditioner that can reduce the number of electric expansion valves used and simplify control. That is.

Structure of the Invention In order to achieve the above object, the present invention provides a compressor, a four-way valve, an outdoor heat exchanger, one electric expansion valve branched from a branch pipe and corresponding to one indoor unit, three-way solenoid valve,
The other electric expansion valve is connected to the one indoor unit and branched from the branch pipe and corresponds to the other indoor unit, and the circuit is connected to the other indoor unit and does not compress during heating. , a four-way valve, a solenoid valve compatible with the indoor unit, each indoor unit, a bypass pipe that bypasses the three-way solenoid valve with a circuit from one of the indoor units, one of the electric fat expansion valves, and an outdoor heat exchanger. and a circuit connected to the other indoor unit, the three-way solenoid valve, one electric expansion valve, and an outdoor heat exchanger. A circuit that controls a plurality of indoor units by an electric expansion valve for cooling and an electric expansion valve for heating and cooling, fully opens the electric expansion valve for cooling during heating, and flows to the expansion valve for heating and cooling via a three-way solenoid valve. , and a circuit that flows to the cooling/heating expansion valve via a bypass pipe, and the outdoor heat exchanger is controlled by the cooling/heating expansion valve.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 35 is an outdoor unit, 36, 37 is an indoor unit, 38 is a compressor, 39 is a four-way valve, 40 is an outdoor heat exchanger, 41 is a branch pipe connected to the outdoor heat exchanger 40, 42 is a branch pipe connected to the branch pipe 41 44 is an electric expansion valve for air conditioning connected between branch pipe 41 and branch pipe 45; 4G is a three-way solenoid valve; one side is connected to branch pipe 45, the other side is connected to branch pipe 45; one is connected to the branch pipe 43, and the other is connected to the branch pipe 47. 4
8 is a bypass pipe which is provided between the branch pipe 45 and the branch pipe 47 so as to bypass the three-way solenoid valve 46 and has a check valve 49 for passage during heating; 50 and 51 are capillary tubes; 50.51 is indoor unit 3
6 and the indoor unit 37 have different capacities, and the refrigerant circulation amount is selected. 52.53 is a check valve for pressure equalization, 54.55 is a capillary tube for pressure equalization,
56.57.58 is an injection check valve, 59.
60.61 is the capillary tube for injection,
62.63 is a solenoid valve, 64.65 is a check valve, 66.67
68 is a temperature sensor installed in a pipe that becomes a low-pressure pipe during cooling, and connected to the electric expansion valve 42 for cooling and the electric expansion valve 44 for air conditioning and heating via a pulse signal converter (not shown); 68 is also a low-pressure pipe; a temperature sensor provided on the side and connected to the air conditioning/heating electric expansion valve 44 via a pulse signal converter;
A pressure sensor 169 detects the pressure of the low-pressure pipe, and is connected to the electric expansion valve 44 for heating and cooling and the electric expansion valve 42 for cooling via a pulse signal converter. 70 is a strainer. The temperature sensors 66 and 67 and pressure sensor 69 control the refrigerant flowing through the outdoor heat exchanger 40 during cooling, and the temperature sensor 68 and pressure sensor 69 control the refrigerant flowing through the outdoor heat exchanger 40 during heating. control. Solid arrows indicate the flow during cooling;
Dotted arrows indicate the flow during heating.

In the above configuration, the refrigerant circulation during cooling is performed by the compressor 38,
A four-way valve 39, an outdoor heat exchanger 40, a branch pipe 41, which separates from this branch pipe 41 and flows through one side to an electric expansion valve 44 for heating and cooling, a three-way solenoid valve 46, a capillary tube 50, and an indoor unit 36, and the other side flows to an electric expansion valve for air conditioning. Expansion valve 42, capillary tube 51, indoor @37 and flow, each indoor unit 36.37
Cooling is performed at At this time, the electric expansion valve 44 for heating and cooling
The electric cooling expansion valve 42 controls the amount of refrigerant circulated to the indoor unit via a pulse signal converter using temperature sensors 66 and 67 and a pressure sensor 69. Next, the refrigerant circulation during heating consists of compression 41138, four-way valve 39, solenoid valves 62 and 6.
3. The refrigerant flows indoors @ 36, 37, is heated by the latent heat of condensation, and flows into the capillary tubes 50 and 51. Here, the refrigerant flowing through one gear tube 50 is transferred to the branch pipe 4.
7, the refrigerant circulates through the check valve 49, the bypass pipe 48, the branch pipe 45, the electric expansion valve for cooling/heating 44, the branch pipe 41, and the outdoor heat exchanger 40, and the refrigerant that flows through the other capillary tube 51 flows into the branch pipe 43. Bypassing the fully closed electric expansion valve 42 for cooling, a three-way solenoid valve 4G, a branch pipe 45, and an electric expansion valve 4 for heating and cooling are installed.
4. It circulates through the branch pipe 41 and the outdoor heat exchanger 40. That is, during heating, the outdoor heat exchanger 40 is controlled by the electric expansion valve 44 for cooling and heating, and the control is carried out by a temperature sensor 68 and a pressure sensor 69, which are sent to the outdoor heat exchanger 40 via a pulse signal converter. This is done by controlling the amount of refrigerant circulated.

Effects of the Invention According to the present invention, during cooling, the liquid refrigerant condensed in the outdoor heat exchanger is branched to each electric expansion valve provided corresponding to the indoor unit, and the liquid refrigerant is branched to one of the electric expansion valves. The refrigerant flows to the indoor unit through the connected three-way solenoid valve and the other electric expansion valve, and the amount of refrigerant circulated in the indoor unit is controlled by the temperature sensor and pressure norunzer in the low-pressure pipe, and during heating,
In one circuit, the liquid refrigerant condensed in the indoor unit is
In the other circuit, the electric t5y &
The refrigerant circuit is structured so that the refrigerant flows through the valve and circulates through the outdoor heat exchanger, and the amount of circulation in the outdoor heat exchanger is controlled by a temperature sensor and a pressure sensor. Correspondingly, it has been simplified without requiring a total of three electric expansion valves: an electric expansion valve for cooling and an electric expansion valve compatible with these indoor units, and an expansion valve for heating.
This makes control easier, and the number of expensive electric Ifij expansion valves used can be reduced, resulting in lower costs.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram of a conventional multi-chamber air-cooled heat pump type air conditioner, and FIG. 2 is a refrigerant circuit diagram of a multi-chamber air-cooled heat pump type air conditioner according to an embodiment of the present invention. 36.37...Indoor unit, 38...Compressor, 39 River four-way valve, 4°...Outdoor heat exchanger, 41.43.45.4
7... Branch pipe, 42.44... Electric expansion valve, 4G.
...Three-way solenoid valve, 48...Bypass pipe agent Yoshihiro Morimoto Figure 1 Figure 2 data

Claims (1)

[Claims] 1. During cooling, the compressor, the four-way valve, the outdoor heat exchanger, one electric expansion valve branched from the branch pipe and corresponding to one indoor unit, the three-way solenoid valve, and the above-mentioned one indoor unit, etc. connected,
and another electric expansion valve branched from the branch pipe and corresponding to the other indoor unit, a circuit connected to the other indoor unit, a compressor, a four-way valve, and an electromagnetic valve corresponding to the indoor unit during heating. a valve, each indoor unit, a bypass pipe that bypasses the three-way solenoid valve in a circuit from one indoor unit, and one electric I
A circuit connected to the kI1 valve and the outdoor heat exchanger and connected to the other indoor heat exchanger, and a circuit connected to the three-way solenoid valve, the one electric expansion valve, and the outdoor heat exchanger. A multi-chamber air-cooled heat pump air conditioner.