JPS62252843A - Multichamber type air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to carry out a stable and smooth air conditioning operation throughout a year by making the first outdoor coil of a condenser and a second outdoor coil of an evaporator operative or inoperative and switching the third outdoor coil used concurrently for the condenser and evapora tor to the condenser or the evaporator. CONSTITUTION:In a space cooling operation mode for all the rooms, first outdoor coils 12A and 12B, a third outdoor coil 14 are set for evaporators, and a heat balance is kept between respective indoor coils 4-1A-4-nB of the evaporator. In this case, a second output coil 13 becomes inoperative. In a space cooling <space heating mode, a heat balance is kept between the indoor coils 4-1A and 4-1B, the second outdoor coil 13, the third outdoor coil 14 and the indoor coils 4-1A-4-2B, which are used as evaporators and the indoor coils 4-2A-4-3B which are used as condensers. In a space cooling >space heating mode, the indoor units 4-1A-4-2B the second indoor coil 13. Which are used as evaporators, and the indoor coils 4-3A, 4-3B, the first outdoor coils 12A and 12B, and the third outdoor coil 14, which are used as evaporators. As described above, an air-conditioning operation in which the heat balance is kept, becomes possible in accordance with various operational modes.

Description

[Detailed description of the invention]

(Industrial usage) Is the present invention an indoor unit with two or more systems for one outdoor unit? Multiple connections can be made for total cooling, total heating,
The present invention relates to a multi-room air conditioner that can easily perform five types of operation modes, including balanced and unbalanced simultaneous cooling and heating operations, while improving the coefficient of performance and effective energy ratio. (Prior art) In this type of multi-room air conditioner, in addition to cooling only and heating only, a part of the air conditioner can be completely cooled and the rest can be operated concurrently with heating, as disclosed in Japanese Patent Application Laid-open No. 55-12372. (Problems to be Solved by the Invention) Incidentally, the conventional multi-room air conditioner capable of simultaneous cooling and heating operation is similar to the device shown in the above-mentioned publication. This requires three times the number of on-off valves, such as solenoid valves, as the number of indoor units, making the equipment complex and costly.Furthermore, since an appropriate capacity control system has not been established, cooling loads and heating In the case of operation where there is a considerable difference between the
There were problems such as the heat balance becoming unbalanced, causing pressure fluctuations in the refrigeration circuit, making it impossible to maintain stable operation, and causing a drop in the coefficient of performance. The present invention has been made to solve these conventional problems, and it is possible to reduce the number of control valves required for switching between cooling and heating to one more than the number of indoor units. At the same time, by establishing a system that can accurately and easily balance the heat balance only on the outdoor unit side, we aim to streamline operations and economics, thereby turning multi-room air conditioners into general-purpose devices. It is an object of the present invention to promote this. Means for Solving Problem C) As is clear from the drawings showing the embodiments, the present invention includes cooling expansion valves C3-IA-3-IB, . . .
3nA/3-uB) and 1 indoor coil (4-IA
-4-IB S″@0°°. ...4.A, 4-1IB) and indoor fan (51A5-IB, ......5-tlA
, 5-tB), each with multiple systems of indoor units) (2
1, 2-4), a multi-chamber air IjLm machine is constructed by sharing the outdoor unit. Furthermore, the present invention provides compression a for the outdoor unit '+11.

[71 and the cooling expansion valves (3-IA, 3-IB...) of each indoor unit (2-1, 2-1)
...River 31mA, 3-t, B) High-pressure liquid pipe +Il+ commonly connected to each inlet, and the first outdoor coil dedicated to the condenser connected between the discharge gas pipe and the high-pressure liquid pipe (111) (12A, 12B) and the high pressure liquid pipe (11
1, a first heating expansion valve +Ift+ and a second heating expansion valve αG, each having an inlet connected to the first heating expansion valve aω.
A second dedicated evaporator connected between the outlet and suction gas pipes.
Murobashi filter a3, a third outdoor coil α that serves as a condenser and evaporator connected in series to the outlet of the second heating expansion valve αG, and a first outdoor coil (12
A, 12B) A connecting pipe a81 connected between the outlets and interposed with a valve Q71 that allows high-pressure refrigerant to flow when the third outdoor coil 041 acts as a condenser;
The third outdoor coil α41 is connected to the outdoor fill switching valve a9, which is provided so as to be able to be connected to the discharge gas pipe or the suction gas pipe, and to each of the indoor units) (21, . . . 2-1). Each indoor coil C4-IA, 4-I
B , ......°・4-mA -4-nB)
t'' Indoor coil switching valve (20-1...20.) which is connected to the discharge gas pipe during heating operation and to the intake gas pipe during cooling operation. At the same time, the first heating expansion valve α6) is closed during the all-room cooling operation and the operation in which the cooling load and the heating load are balanced, and the second heating expansion valve αe is closed when the cooling load is balanced. The switching valve α for the outdoor coil is closed during operation where the heating load and the heating load are balanced, and the third outdoor coil (1
41 and the discharge gas pipe are switched to the side where they communicate with each other. Further, the present invention provides first outdoor films (12A, 12B).
), the heat recovery system is such that the second outdoor coil a3 and the third outdoor coil +141 are formed by an air-to-air type exchanger, and the first outdoor film (12A, 12B) and the second outdoor coil α3 can exchange heat with each other. be made into an integral structure,
In a preferred embodiment, each of the first outdoor coils (12A, 12B) is provided with a bypass passage f211 that can control the bypass flow rate t, so that the heat exchange capacity can be adjusted. (Function) By having the above-described configuration, the present invention achieves all-room cooling, all-room heating, balanced cooling and heating (heating during cooling), and simultaneous cooling and heating with a large degree of imbalance (cooling > heating or cooling). Stable refrigeration operation can be performed corresponding to each of the five operating modes (heating), and this capacity control operation is performed smoothly in the explanation of the embodiment. That is, in (a) all-room cooling operation mode (see Figure 1), the first outdoor coil (12A, 12B) and the third outdoor coil circle act as a condenser, and each indoor filter (4) acts as an evaporator. -The heat balance is balanced between IA and 4.B). In this case, the second outdoor coil Q3 becomes inactive. Next, in the (four-cooling/heating operation mode [see Figure 2)],
Indoor coil (4-IA) that acts as an evaporator. (41B) and an indoor coil (4) that acts as a condenser.
The heat balance is balanced between -2a) and (4-2B),
- 10,000, the first outdoor film (12A, 12]3) acts on the liquid retainer of the high-pressure liquid refrigerant, and the second outdoor film Q3, the third
The outdoor coil f14 becomes inactive. In addition, the indoor coil (4-4A), (4-IB) which becomes the evaporator in the first cooling (heating operation mode (see Figure 3))
, the second outdoor film (13) and the third outdoor coil round, and the indoor coil (4-2A) to (4-3B) that becomes the condenser.
) and the heat balance is balanced. 10,000 μ] In the cooling (cooling) heating operation mode (see Figure 4),
Indoor unit that acts as an evaporator) (4LA3~(4
2B), the second indoor coil a3, the indoor filters (4-3A) and (4-3B) that act as condensers, the first outdoor filters (12A, 12B), and the third outdoor coil a4
The heat balance is balanced between In addition, in the all-room heating operation mode (see Figure 5), all-indoor coils (4-1A) to (43B) act as condensers.
), and the second outdoor coil a3 and third outdoor film I that act as an evaporator. In this case, W, 1 outdoor film (12A, 12
B) Act as a liquid retainer for high-pressure liquid refrigerant. As described above, air conditioning operation with balanced heat balance is possible according to various operating modes. (Embodiment) Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In Figs. 1 to 5, (1) is an outdoor unit. (2l) to (23) are indoor units, and each Indoor units) (2-1) to (23) each have two indoor coils (
4-IA) -(4-IB), (4-2A), (
4-2B), (4-3A), (4-sB) ft in parallel and have the same structure, so one of them is an indoor unit) (21) To explain, the indoor fan (5-IA) The indoor fill (4-1 person) and the indoor fill (41B) each have an indoor 7 am (51B) and an indoor fill (41B), for example, a bypass pipe (61 is parallel Connected cooling expansion valve (3mA) and cooling expansion valve (3l, B)
are connected in series, and the indoor high-pressure liquid pipe is connected to the inlet side of each expansion valve (3-IA) and (3-1B) in both series circuits, and each indoor coil (4-IA) is connected to the inlet side of each expansion valve (3-IA) and (3-1B).
, (41B), gas pipes are connected to the coil ends of each of the expansion valves (41B) to establish a parallel relationship between the two series circuits.
In 3-IA) and (3-IB), a temperature-sensitive expansion valve is used to maintain the temperature of the gas pipe at a predetermined degree of superheat,
In the old days, three-way solenoid valves (26-IA) and (26-IB) were installed as pilot valves to control whether the valves were activated or not. The pressure of the indoor high-pressure liquid pipe is applied to the expansion valve by deenergizing the valve. 10,000 gR units) +11 means multiple indoor units (
2l) to C2-3), the compressor (7), the accumulator [81, the compressor A hot water heat exchanger (9) with a coil interposed in the discharge gas pipe connected to the discharge port of the machine (71), each indoor unit (2-1
) to (2=33) High-pressure liquid pipes (111, hot water heat exchanger (2-bus type t exclusively for condenser with artificial side connected to the coil outlet of 91) connected to the indoor high-pressure liquid pipes in 2=33 - Eggplant first outdoor coil (12A, 12B
), a receiver [
101, a first heating expansion valve (I5) and a second heating expansion valve 161, each having an inlet connected to the high-pressure liquid pipe (!11).
! l The outlet of the heating expansion valve α61 and the accumulator 1
81 and the first outdoor coil (12A, 12B).
The second outdoor coil t131. is dedicated to the evaporator and shares the same fins with the fins to enable complete heat exchange between them. A third outdoor coil α, which serves as a condenser and evaporator, is connected in series to the outlet of the second heating expansion valve 11B+, and has a valve aη, for example, via a reversal valve, and the second heating expansion valve αG. A connecting pipe α & connected between the outlet and the outlet of the first outdoor film (12A, 12B), an end of the third outdoor coil 114I and the first
It is interposed between the inlet of the outdoor film (12A, 12B) and the suction gas pipe on the inlet side of the accumulator tel, and the end of the third external coil α4 is switched and connected to the discharge gas pipe or the suction gas pipe. A switching valve pupil for the outdoor coil, a guide unit interposed between each of the gas pipes and the discharge gas pipe in (2l) to (2-3), respectively (2- 1) - (2-3) A plurality of indoor coil switching valves (2 (LX) - (z□-3)) to switch and connect each gas pipe to the suction gas pipe or discharge gas pipe, and a proportional control valve. A first bypass pipe having a first bypass pipe and a second bypass pipe having four binogusumi magnetic valves are connected in parallel,
This parallel conduit is connected to the first outdoor coil (12A, 12B)
υ, each of the expansion valves α51. The 30,000 solenoid valve fin was attached to the U61 as a pilot valve to control activation and inactivation. (Comprised of 281 devices ◎Each expansion valve α
51. IlG uses a temperature-sensitive expansion valve, and the valve is controlled to maintain the temperature of the intake gas pipe connected to the accumulator +81 at a predetermined degree of superheat. By energizing, the pressure of the suction gas pipe is applied to the expansion valve II or HIC, and by deenergizing, the pressure of the high pressure liquid pipe (111) is applied to the expansion valve. Switching valve for valve and indoor fill (
20l) to (203) may be three-way valves, but in this embodiment, a high-pressure boat is connected to the discharge gas pipe using a solenoid-controlled, pilot-operated, sliding four-way valve as schematically shown in FIG. (A) and the low-pressure boat connected to the suction gas pipe (0) and the low-pressure boat 1+01 connected to the low-pressure boat 1+01 for communication by connecting with a capillary tube, essentially creating a three-way switch. It is used as a valve. In this case, capillary tube 7@ is used as a high pressure boat (4)
High-pressure refrigerant may accumulate as a liquid in the space inside the valve body, which is formed on the outside of the bowl-shaped valve, and this can cause the valve to malfunction. This is to allow normal valve operation by allowing refrigerant to escape to the side. Next, the operating mode of this air conditioner will be explained for each of the five operating modes □ [A] All-room cooling operating mode (see Figure 1) Guide coil switching valves (20-1) to (20-3) The intake gas pipe and each indoor coil (41A,
. . . 43B), the first heating expansion valve 1151 is closed and the second outdoor film Q3 is inactivated, and the second heating expansion valve aQC valve It can be opened and closed arbitrarily, and the outdoor coil switching valve pupil is switched to the side where the third outdoor coil α communicates with the discharge gas pipe. Thus, the first outdoor coil (12A, 12B) and the third outdoor coil circle act as a condenser, and the heat balance is balanced between all the indoor fills (41A to 4-nB) that act as an evaporator. r (E, in this case, the capacity of the condenser can be adjusted by controlling the pressure of the high-pressure liquid line at a constant level by operating the proportional control valve of the bypass passage f211. (see Figure 2), indoor coils (4-1A) and (41B) are for cooling, indoor coils (4-2A) and (4-2B) are for heating, and indoor filter (
4-3A). (43B) is set to stop. Indoor fill switching valve (20-13 is connected to the intake gas pipe in response to a cooling command from the indoor side, indoor coil switching valve (20-2) 11 is connected to the discharge gas pipe in response to a heating command from the indoor side) Both the first and second heating expansion valves αω and Q61 are closed, and the outdoor coil switching valve α91 is switched to the side communicating with the suction gas pipe. , an indoor coil (41A) that serves as an evaporator. (41B) and an indoor coil (4-2A) that serves as a condenser.
, (4-2B), the first outdoor coil (12A, 12B) acts as a reservoir for high-pressure liquid refrigerant together with the i4 receiver plate, and the second outdoor coil t
l:l and third outdoor coil! I41 is in the low pressure line and becomes inactive. ...... (4-3B) is set to heating. The indoor fill switching valve (20-1) is set to the indoor coil switching valve (20-1) on the side communicating with the intake gas pipe according to the cooling command. Valve (20
2), (20-3) are respectively switched to the communication side to the discharge gas pipe by the heating command, both the first and second heating expansion valves α6), the α mark are opened, and -10,000, the outdoor coil is activated. The switching valve α91 is switched to the side communicating with the suction gas pipe. Indoor filter (4-mA) that acts as an evaporator. (4113), the second outdoor coil [31 and the third outdoor coil α pull, and the indoor filter (4-2A) to (4-4
The heat balance is balanced between -3B). In this case, by operating the bypass passage e211 at the maximum bypass amount by fully opening the proportional control valve or opening the bypass valve 4, the first outdoor film (1
2A, 12B Increase the pressure and reduce the heat exchange capacity to use it as the lowest capacity condenser or liquid reservoir. 4-2B) is the air conditioner, indoor coil (4
-3A) and (4-313) are set to heating. The indoor coil switching valves (20l) and (202) are switched to the side communicating with the suction gas pipe by the cooling command, and the indoor coil switching valves (20-33 are switched to the communicating side to the discharge meter gas pipe by the heating command). , the first heating expansion valve α5) is operated to close, the second heating expansion valve αe is opened or closed as desired, and the outdoor coil switching valve α9) is connected to the side communicating with the discharge gas pipe. Make the switch. Indoor coil (4-IA) ~ (4
-2B), the second indoor coil α3, the indoor coils (4-3A), (4-3B) that serve as condensers, the first outer coil (12A, 12B) and the third outer coil α
The heat balance is balanced between the (e) All room heating mode (see FIG. 5) It is assumed that all indoor coils (4-LA) to (43B) are set to heating mode. The indoor fill switching valves (20-1) to (20-3) are respectively switched to the communication side to the discharge gas pipe by the heating command, and the outdoor coil switching valve phase is switched to the communication side to the intake gas pipe, - 1st - 2nd heating expansion valve Q51. G61 operates to open the valve. All indoor coils (4-IA) to (4
3B), the heat balance is balanced between the second outdoor film 13+ serving as an evaporator, and the third outdoor coil α. In this case, by operating the proportional control valve of the bypass passage 21+, the bypass amount is proportionally controlled so that the pressure of the high pressure liquid line is constant, for example, 20Y4. This causes the first outdoor coils (12A, 12B) to act as a liquid reservoir. As described above, the heat balance is balanced between the condenser and the evaporator in each operating mode, so smooth and stable operation is possible. Therefore, the start/stop control of cooling operation in each indoor unit) (4-IA) to (4-31) is performed using a three-way solenoid valve (26-IA).
~ (26-3B) energization ° deenergization and indoor fan (5lA)
- (53B) are turned on and off, and - 10,000, the heating operation is turned on and off by turning on and off of the indoor fans (51A) to (53B). By the way, in the illustrated example, the first outdoor coil (12A, 12B) that serves as the condenser and the second outdoor coil α3 that serves as the evaporator are the first outdoor coil (L2A, 12B).
It has a two-bus type structure arranged upstream and downstream with respect to the airflow direction of f7an■, and has a common structure with fins arranged so as to sandwich it from the front and rear of the second outdoor coil α31i. This has the following advantages. That is, the second outdoor coil a3 and the half part (12B) of the first outdoor coil located downstream thereof conduct heat through the action of the passing air, and the ability of the coil (12B) to act as a condenser is improved. 10,000, 2nd outdoor coil α
31 is a half part (12
Since heating is achieved by the action of A), frost formation is prevented and defrost operation is facilitated during frost formation.〇 (Effects of the Invention) According to the present invention having the above-mentioned configuration and operating. For example, not only when there is a balance between the cooling and heating loads, but also when there is a large imbalance, the first outdoor coils (12A, 12B), which act as condensers, are activated or used as a liquid reservoir. The second outdoor filter α3, which acts as an evaporator, is activated or inactivated, and the third outdoor filter t1, which serves as both a condenser and an evaporator, is substantially inactivated.
By switching operation of 41 to the condenser or evaporator, it is possible to balance the heat balance between the condenser and evaporator in the entire system, and therefore stable and smooth air conditioning operation can be performed throughout the year. It is expected that the energy effective ratio (1!:ER) and the coefficient of performance (OOP) will be greatly improved, and a device with excellent operating economy can be provided. Roughly speaking, the present invention provides indoor units (2-IA) to (2-IA).
By simply receiving the heating/cooling operation signal from the outdoor unit (4B), operation control suitable for each operation mode can be performed only on the Ill side.Moreover, the control valve is the outdoor coil m1 switching valve U9 of xi
and the same number of indoor coil switching valves (2Q-
Since only a small number of units 1) to (20-n) are required, the control system can be simplified, and the multi-room air conditioner of the present invention has great practical value as it has the advantage of being a general-purpose device.

[Brief explanation of drawings]

1 to 5 are device circuit diagrams showing an embodiment of the present invention according to each operation mode, and FIG. 6 is a schematic structural diagram of a switching valve according to the embodiment. il+...Outdoor unit. (2-1) to (2,)... Indoor unit. (31A) to (3-n!])...Air conditioning expansion valve. (41A) to (4-nB)... Indoor coil. (5-UA] ~ (5-nB)...Indoor fan. 161...Bypass IF, 171...Compressor. (11)...High pressure liquid pipe, (12A, 12B)
...First outdoor coil, [+31...Second outdoor coil. (+41...Third outdoor film. α5)...Second heating eyebrow expansion valve. αG...Second heating eyebrow expansion valve. a7I...valve, αto...communicating pipe. Pupil...Switching valve for outdoor fill. (2(Ll) to (20,)...Indoor coil switching valve.)...Bypass passage. (1)-----Issho Gai Nirat. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. Expansion valve for cooling (3_-_1_A, 3_-_1_B,
………3_-_n_A, 3_-_n_B) and indoor coil (4_-_1_A, 4_-_1_B……4_-_n_
Series circuit with A, 4_-_u_B) and indoor fan (5
____1_A, 5_-_1_B……5_-_n_A,
The outdoor unit (1) is shared by a plurality of systems of indoor units (2_-_1, ......2_-_n) each having a
is a compressor (7) and each indoor unit (2_-_1).
,...2_-_n) cooling expansion valve (3_-_1_A
, 3_-_1_B, ......3_-_n_A, 3_-_n
_B) A high-pressure liquid pipe (11) commonly connected to each inlet,
A first outdoor coil (12A, 12B) dedicated to the condenser connected between the discharge gas pipe and the high-pressure liquid pipe (11), and a first heating coil whose inlet is connected to the high-pressure liquid pipe (11), respectively. a second outdoor coil (13) dedicated to the evaporator connected between the expansion valve (15), the second heating expansion valve (16), and the outlet of the first heating expansion valve (15) and the intake gas pipe; and a condenser connected in series to the outlet of the second heating expansion valve (16).
A third outdoor coil (14) that also serves as an evaporator, and a second heating expansion valve (16) outlet/first outdoor coil (12A, 12B)
A third outdoor coil (14) connected across the outlet
When acting as a condenser, the connecting pipe (18) equipped with a valve (17) that allows high-pressure refrigerant to flow and the third outdoor coil (14) can be connected to the discharge gas pipe or the suction gas pipe. A plurality of switching valves (19) for the outdoor coils are provided corresponding to the indoor units (2_-_1...2_-_n), and each indoor coil (4_-_1_A, 4_-
_1_B, ......4_-_n_A, 4_-_n_B) can be switched and connected to the discharge gas pipe during heating operation and to the intake gas pipe during cooling operation.
20_-_1......20_-_n), and the first heating expansion valve (15) is closed during an all-room cooling operation and an operation in which the cooling load and the heating load are balanced. , the second heating expansion valve (16) is closed when the cooling load and the heating load are balanced, and the outdoor coil switching valve (19) is closed when the cooling load is in balance with the heating load, and the outdoor coil switching valve (19) is closed when the cooling load is in balance with the heating load. When the operation is considerably larger than that of the third outdoor coil (14),
A multi-room air conditioner characterized in that the air conditioner is switched to the side where the gas pipe and the discharge gas pipe communicate with each other. 2. The multi-room air conditioner according to claim 1, wherein the first outdoor coil (12A, 12B), the second outdoor coil (13), and the third outdoor coil (14) are air-to-air heat exchangers. Machine. 3. The multi-chamber air according to claim 1 or 2, wherein the first outdoor coil (12A, 12B) and the second outdoor coil (13) have an integral structure capable of exchanging heat with each other. harmonizer. 4. The multi-room air conditioner according to claims 1 to 3, wherein the first outdoor coil (12A, 12B) is provided with a bypass passage (21) that can control the bypass flow rate.