JPH03164666A - Air conditioner - Google Patents

Abstract

PURPOSE:To perform a dehumidifying operation with less reduction of a room temperature and less amount variation by a method wherein a reheater and a two-way valve for determin ing whether the reheater is operated or not are provided. CONSTITUTION:When a dehumidifying operation is carried out, a two-way valve 10 is opened and the first indoor heat exchanger 5 and a reheater 6 are arranged in parallel to perform a dehumidifying and reheating operation. Refrigerant gas of hot temperature and high pressure fed from a compressor 1 passes through a four-way valve 2, is condensed by an outdoor heat exchanger 3, its pressure is reduced by a capillary tube 4 and then the refrigerant gas reaches a distributor 10 under a mixed condition of gas and liquid. Liquid refrigerant flowed into a piping 11 is further reduced at its pressure by a capillary tube 7, passes through the first indoor heat exchanger 8, head exchanged with indoor air and a large amount of dehumidi fied air can be removed. In turn, the gaseous refrigerant flowed into the piping 12 passes through a two-way valve 13 and a check valve 14, flows through a reheater 6 acting as a heat exchanger for a reheating operation, resulting in the reheating of the indoor air dehu midified by the first indoor heat exchanger 5 and cooled by it, and comfortable dehumidified indoor air is supplied to a room so as to perform a heating and dehumidifying operation. In addition, if the two-way valve 13 is closed and the air is dehumidified by the first indoor heat exchanger 5, a cool dehumidified indoor air is supplied to the room and a cooling and dehumidifying operation is carried out.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air conditioner, and in particular to a separate air-cooled type air conditioner suitable for flowing a large amount of high-temperature gas to a reheating heat exchanger during dehumidification. This invention relates to air conditioners.

[Prior Art] Regarding a conventional air conditioner equipped with a reheat heat exchanger,
This will be explained with reference to FIG.

FIG. 3 is a refrigeration cycle system diagram of a conventional air conditioner.

In Figure 3, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is a capillary tube related to a pressure reducer, 5
1 is the indoor first heat exchanger, 6A is a reheating heat exchanger related to the indoor second heat exchanger (hereinafter referred to as a reheater), 9 is an accumulator, 16 is a three-way valve, 17.18.19 is a capillary tube related to a pressure reducer.

Compressor 1, four-way valve 2. The outdoor heat exchanger 3, the capillary tube 4, and the accumulator 9 are located in the outdoor unit, and the indoor first heat exchanger 5. The reheater 6A, the three-way valve 16, and the capillary tubes 17, 18, and 19 are arranged in the indoor unit.

During cooling operation, the outdoor heat exchanger 3 is a condenser, and the indoor heat exchanger 3 is a condenser.
Heat exchanger5. The reheater 6A functions as an evaporator, and during heating operation, the indoor first heat exchanger 5°, the reheater 6A functions as a condenser,
The outdoor heat exchanger 3 functions as an evaporator.

During dehumidification operation, the refrigerant flows through the compressor 1 - four-way valve 2 - outdoor heat exchanger (condenser) 3 - capillary tube 4 - three-way valve 16
- Reheater 6A - Capillary tube 19 - Indoor first heat exchanger (evaporator) 5 - Four-way valve 2 - Accumulator 9 -
It circulates like compressor 1. That is, the refrigerant is transferred to the reheater 6
It is configured to flow in series in the order of A and the first indoor heat exchanger 5.

In addition, as another conventional example, the evaporator is provided with two types of heat exchangers for reheating and heat exchangers for cooling, and the gas refrigerant separated into gas and liquid in the liquid receiver is transferred to the reheating heat exchanger. In this system, a four-way valve is interposed in the gas refrigerant system, and during dehumidification operation, the gas refrigerant flows into the reheating heat exchanger and is condensed. By switching the four-way valve during cooling operation, the gas refrigerant stops flowing to the reheating heat exchanger, and liquid refrigerant flows to the reheating heat exchanger in the same way as the cooling heat exchanger and evaporator. The technology to act as
It is described in Publication No. 56.

[Problem to be solved by the invention] In the conventional air conditioner shown in FIG.
All of the refrigerant flowing through A passes through the three-way valve 16, resulting in a large pressure loss and a problem of deteriorating the performance of the refrigeration cycle.

In addition, as shown in Fig. 3, a three-way valve 16 and three pressure reducers (capillary tube 17,
18, 19), and there was a problem that the refrigerant noise became louder. Generally, valves are designed with the premise of liquid flow, and when a mixture of gas and liquid flows through the valve, noise is generated.

Furthermore, in the technique described in Japanese Utility Model Application Publication No. 53-117056, no consideration was given to the problem of pressure loss due to the four-way valve and the noise caused by the west-side valve and four capillary tubes.

The present invention has been made to solve the problems of the prior art described above, and enables comfortable dehumidification with little decrease or fluctuation in room temperature, especially dehumidification with a slight cooling effect or dehumidification with a slight heating effect.
It is an object of the present invention to provide an air conditioner that can reduce pressure loss, improve refrigeration cycle performance, and reduce refrigerant noise indoors.

Another object is to allow the reheater to function as a refrigerant reservoir during heating operation, thereby automatically adjusting the amount of refrigerant and forming an optimal cycle.

[Means for Solving the Problems] In order to achieve the above object, the configuration of an air conditioner according to the present invention includes a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a pressure reducer, and In an air conditioner consisting of a piping system that connects these to form a refrigeration cycle, a first heat exchanger and a second heat exchanger are connected via pipes in parallel on the indoor side via a refrigerant distributor, and the A two-way valve is provided in the piping between the distributor and the second heat exchanger, and a first pressure reducer and the second heat exchanger are provided in the piping between the distributor and the first heat exchanger on the indoor side. A second pressure reducer is provided in each of the pipes between the container and the junction of the parallel pipes.

In addition, the refrigerant distributor is such that its distribution parts are positioned vertically in the direction of gravity, with the upper side connected to the reheater side piping related to the second heat exchanger, and the lower side connected to the first heat exchanger side piping. They are connected to each other.

[Effect] The operation of the above technical means is as follows.

(1) By providing a reheater and a two-way valve that determines whether or not to make it function, refrigerant can flow in parallel to the first indoor heat exchanger (evaporator) and the reheater. This makes it possible to lower the room temperature and dehumidify with less fluctuation.

(2) By opening the two-way valve and sending warm refrigerant gas to the reheater, and by flowing the refrigerant in parallel to the evaporator and reheater as in (1) above, dehumidification with a slight heating effect is possible.

In addition, dehumidification with a slight cooling effect is possible by closing the two-way valve and allowing the refrigerant to flow through the first indoor heat exchanger (evaporator) that functions as a dehumidifying heat exchanger.

(3) By using the piping branch parts of the reheater and evaporator as distributors and locating the distribution parts vertically in the direction of gravity, high-temperature gas can be supplied to the reheater, which is a heat exchanger for reheating. In addition to increasing the effect of feeding reheat, it is possible to increase the amount of dehumidification by feeding liquid refrigerant into the first indoor heat exchanger (evaporator) serving as a dehumidifying heat exchanger.

[Example] An example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a refrigeration cycle system diagram of an air conditioner according to an embodiment of the present invention, and FIG.
It is an explanatory view showing the action of a valve and a heat exchanger during heating and dehumidifying operation.

In FIG. 1, 1 is a compressor whose rotation speed can be varied by inverter control, etc., 2 is a four-way valve that switches the refrigerant flow direction, 3 is an outdoor heat exchanger, 4 is a capillary tube related to a pressure reducer, 9 is an accumulator, and these are arranged in the outdoor unit.

5 is a first indoor heat exchanger that is to be a dehumidification heat exchanger;
6 is a second indoor heat exchanger (
(hereinafter referred to as reheater), 7 is a capillary tube related to the pressure reducer on the indoor first heat exchanger side, 8 is a capillary tube related to the pressure reducer on the reheater side, 10 is the indoor first heat exchanger This is a distributor provided at a branch where the reheater 5 and the reheater 6 are connected in parallel through piping. Reference numeral 11 indicates a pipe on the indoor first heat exchanger 5 side, 12 indicates a pipe on the reheater 6 side, and both pipes 11.
12 are branched at a distributor 10 and merged at a merging section 15.

Here, the distributor 10 has distribution parts located vertically in the direction of gravity, with the upper side being connected to the plumber 2 on the reheater 6 side, and the lower side being connected to the pipes on the indoor first heat exchanger 5 side. Connected to 11.

13 is a two-way valve (on-off valve) provided in the pipe 12 between the 1-distributor 10 and the reheater 6, and 14 is a check valve.

That is, as shown in FIG. 1, the piping 11 side goes from the distribution valve 10 to the capillary tube 7 and the indoor first heat exchanger to the confluence part 15, and the piping 12 side goes from the distribution valve 10 to the two-way valve. 13. Check valve 14. Reheater6. The equipment is arranged to reach the confluence section 15 via the capillary tube 8, and these are arranged in an indoor unit.

Although FIG. 1 shows an example of a capillary tube as the pressure reducer, it goes without saying that an electric expansion valve may also be used.

Although not shown in the drawings, an outdoor fan with a variable rotation speed is provided near the outdoor heat exchanger 3, and a first indoor fan is provided near the outdoor heat exchanger 3. Needless to say, an indoor fan is disposed near the second heat exchanger.

Next, the operation of the separate air-cooled heat pump type air conditioner of this embodiment will be explained.

During cooling operation, the two-way valve 13 is closed as shown in FIG. 2, and the indoor first heat exchanger 5 acts as an evaporator (marked 0).
The reheater 6 does not work (marked with an x), and the outdoor heat exchanger 3 works as a condenser.

The refrigerant flows in the following manner: compressor 1 - four-way valve 2 - outdoor heat exchanger 3 - capillary tubes 4, 7 - indoor first heat exchanger 5 - four-way valve 2 - accumulator 9 - compressor 1.

On the other hand, during heating operation, the two-way valve 13
is closed, and the indoor first heat exchanger 5 acts as a condenser (0
), the reheater 6 acts as a refrigerant reservoir (Δ mark), and the outdoor heat exchanger 3 acts as an evaporator.

The refrigerant is supplied to the compressor 1 - four-way valve 2 - indoor first heat exchanger 5 -
Flows as follows: capillary tube 7.4 - outdoor heat exchanger 3 - four-way valve 2 - accumulator 9 - compressor 1.

During this heating operation, the capillary tube 8 is connected to the reheater 6.
The refrigerant gas flows in and exchanges heat with the outside air.
Check valve 14. Since the two-way valve 13 is closed, refrigerant liquid will accumulate in the reheater 6 section.

At the start of heating operation, refrigerant liquid accumulates in the reheater 6 section, and there is little circulating refrigerant in the cycle system.

When the room becomes warmer, the refrigerant liquid in the reheater 6 section decreases and the refrigerant liquid increases in the cycle system, forming a heating cycle.

In this way, the reheater 6 functions as a refrigerant reservoir and automatically adjusts the amount of circulating refrigerant, making it possible to form an optimal heating cycle, which provides an effect unique to this embodiment during heating operation.

Next, during dehumidification operation, the two-way valve 10 is
is opened, and the indoor first heat exchanger 5 and reheater 6 perform dehumidification and reheating in parallel (marked 0).

The high temperature and high pressure refrigerant gas discharged from the compressor 1 is passed through the four-way valve 2.
It is then condensed by exchanging heat with outside air in the outdoor heat exchanger 3, and is depressurized in the capillary tube 4 and sent to the distributor 1 in a gas-liquid mixed state.
It reaches 0.

In the distributor 10, warm gas flows into the pipe 12 above the distribution section, which is positioned vertically in the direction of gravity.

At the same time, liquid flows into the lower piping 11 of the distribution section located vertically in the direction of gravity.

The liquid refrigerant that has flowed into the pipe 11 is further depressurized in the capillary tube 7 and flows through the first indoor heat exchanger (evaporator) 5, which serves as a dehumidifying heat exchanger, to exchange heat with indoor air and obtain a large amount of dehumidification. Can be done.

On the other hand, the gas refrigerant that has flowed into the pipe 12 passes through the two-way valve 13 and the check valve 14, flows through the reheater 6, which is a reheating heat exchanger, and is dehumidified and cooled by the first indoor heat exchanger 5. It reheats the indoor air and supplies comfortable dehumidified air indoors. The gas refrigerant that has passed through the reheater 6 is further passed through the capillary tube 8
It is depressurized and becomes a low-temperature, low-pressure refrigerant gas, which merges with the refrigerant gas on the piping 11 side at the merging section 15 and passes through the four-way valve 2. It returns to the compressor 1 via the accumulator 9.

In this manner, by opening the two-way valve 13 and sending warm refrigerant gas to the reheater 6 to increase reheating efficiency, comfortable warm dehumidified air is supplied indoors, and dehumidification with a slight heating effect is performed.

In addition, during dehumidification operation, the two-way valve 13 is closed and the reheater 6
If the indoor first heat exchanger 5 dehumidifies without sending refrigerant to the room, cool dehumidified air is supplied indoors, and dehumidification with a slight cooling effect is performed.

This embodiment has the following effects.

(1) The indoor first heat exchanger (
By flowing the refrigerant in parallel to the evaporator) 5 and the reheater 6, a slight heating dehumidification is possible, and the two-way valve 13 is closed to allow the refrigerant to flow only to the indoor first heat exchanger (evaporator) 5. This makes it possible to dehumidify while cooling the air conditioner. In short, the room temperature can be lowered and dehumidified with less fluctuation.

(2) Indoor first heat exchanger5. The branch part of the piping system of the reheater 6 is used as a distributor 10, and by locating the distribution parts vertically in the direction of gravity, high temperature gas is sent to the reheater 6 to increase the reheating effect, and the indoor side 1. Liquid refrigerant can be fed into the heat exchanger 5 to increase the amount of dehumidification.

(3) Since the three-way valve of the prior art shown in FIG. 3 is eliminated and a two-way valve is used, pressure loss is reduced and refrigeration cycle performance can be improved.

(4) In the conventional technology shown in Fig. 3, there were two pressure reducers on the indoor side, whereas in the embodiment shown in Fig. 1 there are two pressure reducers on the indoor side, reducing refrigerant noise. can do.

[Effects of the Invention] As explained in detail above, according to the present invention, it is possible to perform comfortable dehumidification with little decrease or fluctuation in room temperature, especially dehumidification with a slight cooling effect, and dehumidification with a slight heating effect, and to improve the refrigeration cycle with low pressure loss. It is possible to provide an air conditioner that can improve performance and reduce refrigerant noise indoors.

Furthermore, by allowing the reheater to function as a refrigerant reservoir during heating operation, the amount of refrigerant is automatically adjusted, making it possible to form an optimal cycle.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a refrigeration cycle of an air conditioner according to an embodiment of the present invention, and Fig. 2 shows the functions of valves and heat exchangers during cooling, heating, and dehumidification operations of the apparatus shown in Fig. 1. The explanatory diagram shown in FIG. 3 is a refrigeration cycle system diagram of a conventional air conditioner. 1... Compressor, 2'... Four-way valve, 3... Outdoor heat exchanger, 4.7, 8... Capillary tube, 5...
- Indoor side first heat exchanger, 6... Reheater, 10... Distributor, 11° 12... Piping, 13... Two-way valve.

Claims (1)

[Claims] 1. An air conditioner comprising a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a pressure reducer, and a piping system connecting these to form a refrigeration cycle: Inside, a first heat exchanger and a second heat exchanger are connected via piping in parallel via a refrigerant distributor, and a two-way valve is provided in the piping between the distributor and the second heat exchanger. , a first pressure reducer in the pipe between the distributor and the first heat exchanger on the indoor side, and a second pressure reducer in the pipe between the second heat exchanger and the confluence of the parallel pipes. An air conditioner characterized by having separate containers. 2. The refrigerant distributor shall have its distribution parts located vertically in the direction of gravity, with the upper side connected to the reheater side piping related to the second heat exchanger, and the lower side connected to the first reheater side piping.
The air conditioner according to claim 1, wherein the air conditioner is connected to the heat exchanger side piping.