JPH02293566A - Air conditioner - Google Patents

Abstract

PURPOSE:To provide an efficient air-conditioner that employs a room-cooling refrigerant circuit at the time of room cooling and a room-heating refrigerant circuit having a closed type compressor at the time of room heating by commonly using an indoor heat exchanger and an accumulator in the cooling and heating refrigerant circuits. CONSTITUTION:Solenoid valves V1, V2 are opened at the time of room cooling, a solenoid valve V3 is closed, and a compressor P1 is operated. Refrigerant is discharged as high temperature and high pressure gas from the compressor P1, becomes high temperature and high pressure liquid via an outdoor heat exchanger R2, low temperature and low pressure in a capillary C1, is supplied to an indoor heat exchanger R1 via the valve V2, becomes low temperature and low pressure gas, and is again returned to the compressor P1 via an accumulator A1. The valves V1, V2 are closed at the time of room heating, the valve V3 is opened, a small-sized closed compressor P2 is operated, the refrigerant is discharged as gas, supplied to the exchanger R1, condensing heat is discharged to become liquid, thereby heating a room. The liquefied refrigerant is supplied to a burner B1 via the valve V3, heated to become gas, and returned to the compressor P2 via the accumulator A1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air conditioner, and more particularly to a refrigerant heating type air conditioner equipped with a burner that heats a refrigerant during heating.

Prior Art and Problems to be Solved by the Invention In the past, air conditioners for performing winter heating and summer cooling with the same device included a pair of heat exchangers placed indoors and outdoors, and a system between the two heat exchangers. It is equipped with a compressor to circulate refrigerant between the two heat exchangers, and a four-way valve to reverse the flow of refrigerant between the two heat exchangers.By switching the four-way valve, the indoor heat exchanger is used to condense the refrigerant during heating. A so-called heat pump type is used, in which the outdoor heat exchanger is used as an evaporator, and during cooling, the indoor heat exchanger is used as a refrigerant evaporator, and the outdoor heat exchanger is used as a condenser. ing.

However, depending on the type of refrigerant and the capacity of the compressor, this heat bomb type air conditioner generally has poor heating efficiency, especially when the outdoor temperature falls below a certain temperature range (around 7 degrees Celsius). There is a problem in that the vaporization of the refrigerant in the outdoor heat exchanger becomes insufficient, resulting in insufficient heating capacity.

Therefore, various air conditioners have been developed that are equipped with burners that forcibly heat and vaporize refrigerant during winter heating.

For example, the air conditioner shown in Figure 2 is an indoor unit (u
The indoor heat exchanger (R3) located in a), the four-way valve (v0, accumulator (A2), compressor (P3), outdoor heat exchanger (R4) and capillary ( A refrigerant heating unit that has a branch circuit (S4) equipped with a burner for heating the refrigerant (B2), an akinimulator (83), and a small compressor (P4) in the middle of the heat-bump refrigerant circuit (S3) consisting of C2). (U5
), it has both the normal heat bomb type air conditioning function and the heating function using refrigerant heating.

In addition, the air conditioner shown in Fig. 2 (b+) is an indoor unit (U
3), and the four-way valve (V4), accumulator (A2), compressor (P8), outdoor heat exchanger (R4), and capillary located in the outdoor unit (U4). (C2) of the heat bomb refrigerant circuit (S5), on the outdoor unit (U4) side,
A branch circuit (S8) is provided from the downstream side of the capillary (C2) to the upstream side of the accumulator (A2) via the refrigerant heating burner (B2). Both share the same accumulator (A2) and compressor (P3) to simplify the mechanism.

The air conditioner shown in Fig. 2(C) has an indoor unit (
03), a first indoor heat exchanger (R3°) disposed in
A dedicated heat bomb cooling circuit (S7) consisting of a compressor (P3), an outdoor heat exchanger (R4), and a capillary (C2) located in the outdoor unit (U4), and a circuit located in the indoor unit (U3) Second indoor heat exchanger (1
? 3”), a capillary (Ca) placed in the refrigerant heating unit (U5), a refrigerant heating burner (B2), an accumulator (A3), and a small compressor (P4). It is equipped with two dedicated circuits (S8).

However, although the rice field air conditioner shown in Figure 2 above has a refrigerant heating type heating function with high heating efficiency, it has a heat bomb type heating function with poor heating efficiency and high running costs. Therefore, there is a lot of waste in the mechanism.

Although the air conditioner in the city shown in Figure 2 has a highly efficient heating function using refrigerant heating, it has the waste of having a heat pump type heating function. However, it is necessary to use a large-capacity heat bomb type air-conditioning compressor (P3), and there is also the problem that running costs are high.

In addition, the air conditioner shown in Figure 2 (C) does not have a heat bomb type heating function, so there is no waste in the mechanism, and when heating the refrigerant, it is only necessary to operate the small capacity compressor (P4). Although the running cost is lower, there is a problem that the initial cost is higher overall, such as the need for two indoor heat exchangers (R3°) (R3'').

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an air conditioner that is simple in structure, has no waste in its mechanism, and is capable of efficient heating and cooling.

Means for Solving the Problems> In order to solve the above problems, the air conditioner of the present invention provides the above-mentioned A refrigerant circuit for cooling that reaches the other end of the indoor heat exchanger, and a first branch circuit that is connected from the other end of the indoor heat exchanger to the upstream side of the akinimulator via at least a burner for heating the refrigerant. , a second branch circuit connected from the downstream side of the accumulator to one end side of the indoor heat exchanger via a small closed compressor, the first branch circuit, the accumulator, and the second branch circuit. A heating refrigerant circuit is configured from the other end to the one end of the indoor heat exchanger.

In the air conditioner of the present invention having the above configuration, during cooling, normal heat bomb type cooling is performed using a cooling refrigerant circuit having the same configuration as in the past, and during heating,
Efficient refrigerant heating is performed using a heating refrigerant circuit equipped with a small closed compressor that shares the indoor heat exchanger and accumulator with the cooling refrigerant circuit.

Embodiment> The present invention will be described below based on FIG. 1 showing an embodiment.

The air conditioner of this embodiment, as shown by the white arrow in the figure,
The indoor heat exchanger (Rl) installed in the indoor unit (01)
), connect the outgoing circuit (Sla) and the outdoor unit (
The outdoor heat exchanger (R2) installed in the return circuit (U2) and the return circuit (
stb) to the other end of the indoor heat exchanger (Rl), and the other end of the indoor heat exchanger (R1) as shown by the black arrow in the figure. Out from the side, first
The branch circuit (82a), the accumulator (^l) provided in the forward circuit (Sla), and the second branch circuit (S2b)
) and a heating refrigerant circuit (S2) that reaches one end of the indoor heat exchanger (Rl).

In the cooling refrigerant circuit (S1), the outgoing circuit (Sla) is equipped with stop valves (Sla) in order from one end of the indoor heat exchanger (Rl).
K1), solenoid valve (Vl), Aki! Mul/-9 (
AI), a receiver tank (TI), and a compressor for refrigerant compression (PI) are arranged, and in the return circuit (Slb), from the outlet side of the outdoor heat exchanger (R2), a capillary (Cl), A '1 magnetic valve (v2) and a stop valve (K2) are arranged.

Also, of the heating refrigerant circuit (S2), the first branch circuit (S2a) is connected to the stop valve (K2) of the return path (Slb).
and the solenoid valve (v2), and the outgoing route (S
The second branch circuit (S2b) is connected to the upstream side of the accumulator (At) of the forward path (Sla), and the second branch circuit (S2b) branches from the position downstream of the accumulator (Al) of the outgoing path (Sla), and connects to the small closed type compressor. Via (P2), solenoid valve (Vl)
and the stop valve (Kl).

Among the solenoid valves (m to (V3)), the solenoid valve (m) is open during cooling operation, and directly connects the indoor heat exchanger (R1) and the accumulator (At), so that the indoor heat exchanger (Rl) It guides the vaporized refrigerant to the accumulator (At), and is closed during heating operation to prevent the vaporized refrigerant from the burner (Bl) from being directly supplied to the indoor heat exchanger (R1). Also, the solenoid valve (V2)
(V3) is controlled so that when one is in the open state, the other is in the closed state, thereby connecting the other end of the indoor heat exchanger (Rl) to one of the refrigerant circuits (81) (S2). Used to connect to either one.

The accumulator (AI) stores an appropriate amount of refrigerant during operation of the air conditioner to keep the amount of refrigerant discharged from the compressor (PL) (P2) constant, or stores it internally under external control. By discharging the refrigerant, the compressor (P
L) Used to discharge a volume greater than the capacity of (P2). Further, the receiver tank (Tl) is used to store liquefied refrigerant.

As the compressor (Pl), a compressor with a relatively large capacity is used so that it can be used for normal heat pump type air conditioning, while as the closed type compressor (P2), it is used to efficiently perform refrigerant heating type heating. For better performance, a closed compressor with a relatively small capacity is used, which is the minimum required for refrigerant-heated space heating.

Note that the compressor used for refrigerant heating is limited to a closed type because during heat bomb cooling, the refrigerant vaporized in the indoor heat exchanger (Rl) flows back through the compressor and passes through the accumulator (A1). ) without going through the receiver tank (Tl)
This is to prevent it from being supplied to

In order to prevent the backflow of refrigerant, it is possible to use a combination in which a check valve is connected to a non-closed compressor, but in this combination, the flow of refrigerant is obstructed by the throttle of the check valve. If a small compressor is used, there is a risk that sufficient compression capacity will not be obtained, and the compressor will need to be enlarged, making it impossible to improve the efficiency of refrigerant-heated space heating. Therefore, a combination of a non-closed compressor and a check valve is preferable for the present invention. Not good.

As a capillary (Cl) for lowering the temperature and pressure of the high temperature and high pressure refrigerant liquefied in the outdoor heat exchanger (R2), depending on the type of refrigerant used, the capacity of the compressor (PL), etc.
A material having an appropriate inner diameter and length is used.

Moreover, as the burner (Bl), burners of various combustion types can be used, and the heating temperature can also be set in an appropriate temperature range depending on the type of solvent used.

The stop valve (Kl) (K2) is used to disconnect the indoor heat exchanger (Rl) from the refrigerant circuit (St) (32) when transporting or installing the air conditioner, and disconnects the indoor unit (Ul) and outdoor unit (
When it is necessary to separate both circuits (St)
(S2) to prevent loss of refrigerant.

The air conditioner of this embodiment, which consists of the above-mentioned parts, is used for heating and cooling in the following manner.

First, during cooling, the solenoid valves (Vl) (V2) are opened,
The compressor (PI) is operated with the solenoid valve (v3) closed. Then, the refrigerant is discharged as a high temperature and high pressure gas from the compressor (PL) as shown by the white arrow,
After releasing the heat of condensation in the outdoor heat exchanger (R2) and becoming a high-temperature, high-pressure liquid, it passes through a capillary (C1) and is lowered in temperature and pressure. It is supplied to the indoor heat exchanger (Rl) via.

The low-temperature, low-pressure liquid refrigerant supplied to the indoor heat exchanger (Rl) absorbs the heat of vaporization and becomes a low-temperature, low-pressure gas, thereby cooling the room. In addition, the vaporized low-temperature, low-pressure refrigerant is transferred to the stop valve (κ1), solenoid valve (v1), accumulator (AI
) and the receiver tank (TI) to the compressor (PI) and used again for the above cycle.

On the other hand, during heating, the small closed compressor (
P2) is activated. Then, as shown by the black arrow, the refrigerant is discharged as a gas from the closed compressor (Pi), and is supplied to the indoor heat exchanger (Rl) via the stop valve (Kl). (R1) releases heat of condensation and becomes a liquid, heating the room at that time.

The liquefied refrigerant is supplied to the burner (Bl) via the stop valve (K2) and the solenoid valve (V8), is heated in the burner (B1), becomes a gas, and is closed again via the accumulator (Al). It is supplied to the compressor (P2) and used again in the above cycle.

Although the air conditioner of the present invention has been described so far only based on the above embodiments, the air conditioner of the present invention is not limited to the above embodiments.

For example, in the above embodiment, two solenoid valves (V2) (V3) were used to switch the refrigerant at the branch part between the cooling refrigerant circuit (St) and the first branch circuit (S2a). One three-way valve may also be used.

Other parts are not limited to the above embodiments,
Various design changes can be made without changing the gist of the invention.

Effects> The air conditioner of the present invention is configured as described above, and since it does not have a heat bomb type heating function, there is no waste in the configuration, and the refrigerant circuit for cooling and the refrigerant circuit for heating are separated. ,
The structure is simple because the indoor heat exchanger and accumulator are shared.

Moreover, during cooling, the above-mentioned cooling refrigerant circuit with the same configuration as before is used to perform normal heat-bump cooling, and during heating, the above-mentioned heating refrigerant circuit equipped with a small closed type compressor is used. , efficient refrigerant heating can be performed.

Therefore, the air conditioner of the present invention has a simple structure, no waste in mechanism, and can perform efficient heating and cooling.

[Brief explanation of the drawing]

Fig. 1 is a piping diagram showing one embodiment of the air conditioner of the present invention, and Fig. 2 (ω to (C) are piping diagrams showing the piping of a conventional air conditioner, respectively. (AI)... Accumulator, (Bl)...Burner, (CI)...Capillary, (PI)...Compressor, (P2)...Closed compressor, (Rl)...Indoor heat exchanger, ( R2)...
・Outdoor heat exchanger, (S1)...refrigerant circuit for cooling, (S2)...refrigerant circuit for heating, (S2a)...first branch circuit, (S2b)...second branch circuit. Patent applicant Daikin Industries, Ltd.

Claims (1)

[Claims] 1. From one end of the indoor heat exchanger, at least Also accumulator, compressor, outdoor heat exchange into the above chamber through the vessel and capillary. Cooling refrigerant circuit leading to the other end of the heat exchanger from the other end of the indoor heat exchanger. At least the air is heated through a burner for heating the refrigerant. The first Branch circuit and downstream side of accumulator? Indoor heat is generated through a small closed compressor. A second branch connected to one end of the exchanger the first branch circuit and the first branch circuit. By the accumulator and the second branch circuit From the other end of the indoor heat exchanger to one end A refrigerant circuit for heating is configured. An air conditioner featuring: