JP2003254555A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner efficiently which performs refrigerant flow action and heat exchange air flow action in each of cooling operation, dehumidifying operation and heating operation, and fully exhibits a reheating- dehumidifying function even in a large capacity model. <P>SOLUTION: A dehumidifying throttle valve 5 is provided at an intermediate part of a refrigerant passage communicating a front side heat exchanger part 17A and a rear side heat exchanger part 17B constituting an indoor heat exchanger 17. A refrigerant led out of the throttle valve is separated and guided in two directions and led to the front side heat exchanger part. The front side heat exchanger part is provided with parallel refrigerant passages vertically bisected from the almost center part in the vertical direction. Refrigerant piping for leading in the refrigerant separated and guided from the throttle valve is connected to the windward side of each passage, and the parallel passages are branched in two upper and lower directions at each upper or lower passage and led out after joining on the leeward. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to an air conditioner having an improved structure of a refrigerant flow path in an indoor heat exchanger.

[0002]

2. Description of the Related Art An air conditioner for general use consists of an indoor unit arranged indoors and an outdoor unit arranged outdoors, and a heat pump type refrigeration cycle is installed in these indoor and outdoor units through a refrigerant pipe. The components that communicate with each other are arranged in a distributed manner to enable switching between cooling operation and heating operation.

FIG. 9 is a diagram for explaining the structure of the indoor heat exchanger A arranged in the indoor unit body and the structure of the refrigerant flow path provided in the indoor heat exchanger A. The indoor heat exchanger A
Is composed of a combination of the front heat exchanger portion A1 and the rear heat exchanger portion A2, and is formed in an inverted V shape in a side view. The front heat exchanger part A1 is formed in a substantially arc shape in a side view, and is arranged on the front side of the indoor unit body. The rear heat exchanger A2 is
It is formed in a straight shape in a side view, and is arranged on the back side of the indoor unit main body with an inclination.

The heat exchange air has a flow of flowing from the front side of the indoor unit body to the front heat exchanger section A1 and a flow of flowing from the upper side of the indoor unit body to the rear heat exchanger section A2. Each of the heat exchanger parts A1 and A2 is a fin tube type in which the heat exchange pipes P penetrate the fins F in a meandering manner, and the heat exchange pipes are arranged side by side in two rows in front and back (up and down).

From the place where the refrigerant communicates with the heat exchange pipe P, the heat exchange pipe P constitutes a refrigerant flow path. The thick line in the figure shows the state of the flow of the refrigerant during the cooling operation cycle (same for the dehumidifying operation). The heat exchange airflow windward side (hereinafter simply referred to as the front side row of the front side heat exchanger unit A1)
This row is called the windward side, and the upper end serves as the inlet a, and the refrigerant is guided from the expansion means. From here, the refrigerant is guided in two directions of the leeward side (hereinafter simply referred to as the leeward side) of the heat exchange air flow, which is the rear side row, through the upwind side row and the U-shaped distribution pipe b.

One of them is guided from the lower end to the upper end of the leeward side row through the jumping pipe c, and the other leeward side row merges with the refrigerant directed to the upper end, and then the front heat exchanger section A
1 is introduced into the dehumidification throttle valve B. The refrigerant derived from the dehumidifying throttle valve B is guided to the U-shaped pipe d provided in the windward row of the rear heat exchanger section A2, is branched and guided in two directions, and is guided to the leeward row. It joins at the character tube e and is further sucked into the compressor.

During the cooling operation cycle, the dehumidifying throttle valve B is in a fully opened state and the refrigerant is allowed to flow without being throttled. During the dehumidifying operation cycle, the dehumidifying throttle valve B functions as a throttle according to dehumidification. As a result, the refrigerant condensing action is performed in the front heat exchanger portion A1 and the refrigerant evaporation action is performed in the rear heat exchanger portion A2. Thus, the reheat dehumidifying function is exerted and the dehumidifying action is performed.

[0008]

In the conventional refrigerant flow path structure of the indoor heat exchanger A having the reheat dehumidifying function, the front heat exchanger part A1 having the inlet part a as the first half side is provided in the windward row. There is only one flow path guided along, and the latter half side is a two-way channel divided by the U-shaped distribution pipe b, and the dehumidification throttle valve B is provided in the middle part of the latter half side flow path. become.

In the structure of the first half side one-passage and the second half side two-passage in the indoor heat exchanger A as described above, the flow rate of the refrigerant that changes in the two-phase state is limited, the resistance is large, and the pressure loss on the refrigerant side occurs. It gets bigger. Therefore, even if a small cooling capacity specification can be used practically, for example, 5.6
Even if an attempt is made to realize a large cooling capacity of KW or more, it is extremely difficult to obtain a complete reheat dehumidifying function.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a cooling operation, a dehumidifying operation,
It is an object of the present invention to provide an air conditioner that can efficiently perform both the refrigerant circulation action and the heat exchange air circulation action in each heating operation, and can exhibit a sufficient reheat dehumidification function even in a large capacity model.

[0011]

In order to satisfy the above object, an air conditioner of the present invention comprises an outdoor unit main body and an indoor unit main body, and the outdoor unit main body and the indoor unit main body are arranged in a distributed manner to cool the air conditioner. It comprises a compressor, a four-way switching valve, an outdoor heat exchanger, an expansion means and an indoor heat exchanger, which are communicated via a refrigerant pipe so as to constitute a heat pump type refrigeration cycle capable of switching between operation and heating operation. The indoor heat exchanger includes a plurality of fins arranged in parallel at a predetermined interval,
It is a fin tube type consisting of a heat exchange pipe that penetrates these fins and forms a flow path for conducting the refrigerant inside, and heat exchange air flows between the fins, and the indoor heat exchanger is an indoor unit. A front heat exchanger portion is formed in an inverted V shape in a side view from a front heat exchanger portion arranged to face the front surface portion of the main body and a rear heat exchanger portion arranged to face the upper surface portion. In the middle part of the refrigerant flow path communicating between the rear heat exchanger section and the rear heat exchanger section, the front heat exchanger section causes the refrigerant to condense, and the rear heat exchanger section causes the refrigerant to evaporate to dehumidify. A throttling device that establishes an operation cycle is provided, and in the cooling / dehumidifying operation cycle, the rear heat exchanger unit is located upstream of the refrigerant passage of the throttling device and the front heat exchanger unit is located downstream of the refrigerant passage of the throttling device. In the rear heat exchanger section, the refrigerant inlet section is provided on the windward side of the heat exchange air flow. The refrigerant is guided from the refrigerant inlet portion in two directions in the front-rear direction, led to the leeward side of the heat exchange air flow, and then merged to be introduced into the throttle device. The formed refrigerant has a flow passage structure in which it is divided and guided in two directions and guided to the front heat exchanger section. In the front heat exchanger section, a parallel refrigerant flow passage is divided into two parts vertically from a substantially central portion. A refrigerant pipe for introducing the refrigerant, which is diverted and guided from the expansion device, is connected to the windward side of the heat exchange air flow in each of the upper and lower flow passages, and the upper and lower flow passages are branched in the upper and lower two directions to form the heat exchange air flow. It was equipped with a parallel flow path that was led out after merging on the leeward side.

Further, the above-mentioned expansion device is provided with a main flow path which is opened during the cooling operation cycle and closed during the dehumidification operation cycle, and a restriction flow path which conducts the refrigerant during the dehumidification operation cycle and secures a predetermined throttle amount for dehumidification. It is a throttle valve,
The refrigerant pipe for guiding the refrigerant into the dehumidifying throttle valve during the dehumidifying operation cycle is straight and connected to the dehumidifying throttle valve side wall in a substantially horizontal posture, and the refrigerant pipe for guiding and guiding the refrigerant from the dehumidifying throttle valve is , Is connected to the lower end of the dehumidification throttle valve, extends downward, and is then bent in the horizontal direction, and this horizontal end is connected to approximately the center of a U-shaped distribution pipe whose refrigerant pipes are connected to both ends, A refrigerant pipe for introducing and guiding the refrigerant into the dehumidifying throttle valve is inserted between the refrigerant pipes connected to both ends of the U-shaped distribution pipe.

Further, a refrigerant pipe connected to a refrigerant inlet portion of the rear heat exchanger portion, a refrigerant pipe connecting the rear heat exchanger portion outlet and the expansion device inlet, a throttle device outlet and a front heat exchanger portion inlet. The diameter of the refrigerant pipe provided with the U-shaped diversion pipe communicating with the refrigerant pipe connected to the refrigerant outlet part of the front heat exchanger part is larger than the diameter of the heat exchange pipe forming the indoor heat exchanger. is there.

By providing the means for solving the above problems, it is possible to effectively perform both the refrigerant circulation action and the heat exchange air circulation action in each of the cooling operation, the dehumidifying operation, and the heating operation. Even a large-capacity model can exhibit a sufficient reheat dehumidification function.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
A description will be given with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the indoor unit configuration of the air conditioner, and FIG. 2 is an explanatory diagram showing the refrigeration cycle configuration of the air conditioner and the flow path configuration of the indoor heat exchanger.

First, the indoor unit shown in FIG. 1 will be described. The indoor unit body 11 includes a front panel 12 and a rear plate 13. A front suction port 12a is opened on the front surface side of the front panel 12, and an upper suction port 12b is opened on the upper surface. In the indoor unit body 11, the suction ports 12a and 12b are provided.
An air filter (further schematically shown) 16 that is bent in a gentle arc shape so as to face each other and an indoor heat exchanger 17 are arranged.

The indoor heat exchanger 17 has a front suction port 12a.
Front heat exchanger part 17A facing the upper part and the upper suction port 12
It is composed of a rear heat exchanger portion 17B facing b and is formed in an inverted V shape in a side view. The front heat exchanger portion 17A is formed in a substantially arcuate shape in a side view and is arranged on the front side of the indoor unit body. The rear heat exchanger part 1
7B includes a main heat exchanger portion 17b1 that is arranged in a tilted posture on the rear surface side of the indoor unit body and is formed in a straight shape, and an auxiliary heat exchanger 17b2 that is parallel to the upper surface side of the main heat exchanger portion. Become. On the front upper part of the front side heat exchanger part 17A,
A dehumidifying throttle valve 5, which is a throttle device described later, is arranged.
Further, the front drain pan 18 is provided below the front heat exchanger portion 17A.
a is arranged, and a rear drain pan 18b is arranged below the rear heat exchanger portion 17B. Front and rear drain pan 18a,
18b is provided integrally with the rear plate 13.

Between the inner position of the indoor heat exchanger 17 formed in an inverted V shape in side view, that is, between the front heat exchanger portion 17A and the rear heat exchanger portion 17B, these heat exchanger portions are provided. The indoor blower 19 is arranged so as to be covered. Rear plate 1
3, the air duct 2 is provided on the lower side of the rear drain pan 18b.
0 is formed, and a blowout port 21 is opened in the lower portion of the front panel 12 that communicates with the ventilation path 20. The front drain pan 18a is provided along the front end of the outlet 21, and the rear drain pan 18b is provided along the upper side of the air passage 20.

Next, the overall structure of the air conditioner shown in FIG.
The refrigerant flow path configuration of the refrigeration cycle circuit and the indoor heat exchanger will be described. The air conditioner is composed of an outdoor unit main body 30 and an indoor unit main body 11, which are schematically indicated by a chain line.
The refrigeration cycle components housed and arranged in the indoor unit body 11 are the indoor heat exchanger 17 as described above with reference to FIG.
Only. In the outdoor unit main body 30, refrigeration cycle components such as the compressor 1, the four-way switching valve 2, the outdoor heat exchanger 3, and the electronic automatic expansion valve 4 that is an expansion unit are housed and arranged.

Then, the compressor 1, the four-way switching valve 2, the outdoor heat exchanger 3, the electronic automatic expansion valve 4, and the indoor heat exchanger 17 are connected to each other through the refrigerant pipe 6 so as to constitute a heat pump type refrigeration cycle. It The front and rear heat exchanger parts 17A, 1
7B, the heat exchange pipe P penetrates in a meandering manner through a large number of fins F juxtaposed at a predetermined interval. The main heat exchanger part 17b1 of the front side heat exchanger part 17A and the rear side heat exchanger part 17B has two rows of heat exchange pipes P arranged in parallel, and the auxiliary heat exchanger 17b2 has one line of heat exchange pipes P. It is provided.

The heat exchange air is introduced into each of the front heat exchanger section 17A and the rear heat exchanger section 17B as described above. The heat exchange air guided to the front heat exchanger portion 17A performs heat exchange with the two rows of heat exchange pipes P, and the heat exchange air guided to the rear heat exchanger portion 17B is one row of the auxiliary heat exchanger 17b2. Heat exchange is performed with the heat exchange pipes P in a total of three rows with the two rows of the main heat exchanger portion 17b1. The refrigerant flow path configuration in the indoor heat exchanger 17 in the figure shows the state during the cooling operation and dehumidifying operation cycle.
The description will be given based on the flow of the refrigerant during these operation cycles. Further, the refrigerant flow path configuration during the heating operation cycle is completely opposite to that in the figure, and therefore the expressions of the inlet and the outlet need to be reversed.

The refrigerant inlet portion 7a of the indoor heat exchanger 17 has a heat exchange air flow windward side of the rear heat exchanger portion 17B.
Auxiliary heat exchanger part 17b located simply on the windward side)
2, the heat exchange pipe P is provided in the U-shaped pipe Pa. The U-shaped pipe Pa is divided and guided in two up and down directions, and each of the U-shaped pipes is communicated with the heat exchange pipes P of the windward row Ka in the main heat exchanger portion 17b1, and after further turning to the leeward side, to the leeward row Kb. They meet at the U-shaped pipe Pb provided.

The combined refrigerant flows out from the rear side heat exchanger portion 17B and is guided to the inlet portion 5a of the dehumidifying throttle valve 5 constituting the throttle device. Then, the refrigerant led out from the dehumidifying throttle valve 5 is diverted and guided in two directions via a U-shaped flow dividing pipe 8 provided immediately after being connected to the outlet portion 5b, and each of them is connected to the front heat exchanger portion 17A. Be led to. The front side heat exchanger portion 17A is vertically moved from the substantially central portion in the vertical direction.
The flow path is divided. The refrigerant, which is split and guided from the dehumidifying throttle valve 5, is introduced into the windward row Ka in each of the upper and lower flow paths.

In the upper and lower flow passages in the front side heat exchanger portion 17A, the diversion is guided in the upper and lower directions. In the upper side flow path, the upper side flow path Ka wraps around from the upper and lower ends of the windward side row Ka to the leeward side row Kb and joins at the U-shaped pipe Pc provided therein. Also in the lower side flow path, the upper and lower end portions of the windward side row Ka wrap around to the leeward side row Kb and join at the U-shaped pipe Pd provided there. Refrigerant that merges in the upper side flow passage and the lower side flow passage in the front side heat exchanger portion 17A and is discharged from the outlet portions 7b, 7b merges at a predetermined portion and is guided to the four-way switching valve 2. It has become.

A feature of the refrigerant flow passage structure of the indoor heat exchanger 17 is that the refrigerant is split into two flow passages immediately after being introduced from the refrigerant inlet portion 7a of the rear heat exchanger portion 17B, and then merged. It is guided to the dehumidification throttle valve 5. Further, it is led out from the dehumidifying throttle valve 5 and is divided into four flow paths so that the outlet portion 7
It is provided with so-called 2-4 paths (flow paths) reaching b and 7b. The contents of the four flow passages are two rows of parallel flow passages that are guided from the dehumidification throttle valve 5 to the upper side flow passage and the lower side flow passage of the front side heat exchanger unit 17A, and the upper and lower portions. In each of the side flow passages, there are two parallel flow passages divided into upper and lower parts, and in the end, there are a total of four parallel flow passages.

In the air conditioner constructed in this way, during the cooling operation cycle, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 is passed through the four-way switching valve 2 to the outdoor heat exchanger 3
And is condensed and liquefied. This liquid refrigerant is adiabatically expanded by the electronic automatic expansion valve 4, guided to the indoor heat exchanger 17, and evaporated as described later. In the indoor unit main body 11, the indoor blower 19 is driven, and indoor air is sucked into the main body 11 through the front suction port 12a and the upper suction port 12b, and the indoor heat exchanger 17
To exchange heat with the refrigerant guided through the heat exchange pipe P. The heat-exchanged air after the heat exchange is guided to the air passage 20 and blown out from the air outlet 21 into the room to perform a cooling operation.

During the dehumidifying operation cycle, the same refrigerant flow path as during the cooling operation cycle is constructed. When the dehumidifying throttle valve 5 performs the throttle action, the rear heat exchanger portion 17B on the upstream side of the throttle valve 5 performs the refrigerant condensing action, and the front heat exchanger portion 17A on the downstream side cools the refrigerant. Evaporate. That is, the dehumidifying throttle valve 5 is connected to the rear heat exchanger portion 17B.
Therefore, the front heat exchanger portion 17A is divided into a condenser and an evaporator, and a reheat dehumidifying function can be obtained. The moisture in the room is removed and it dries. During the heating operation cycle, the refrigerant flow path is completely opposite to the cooling operation and the dehumidifying operation. Compressor 1
The refrigerant guided to the indoor heat exchanger 17 via the four-way switching valve 2 is divided into upper and lower side flow passages of the front heat exchanger portion 17A, each of which constitutes a parallel flow passage to form the dehumidifying throttle valve 5 After passing through, it is guided to the rear heat exchanger portion 17B.

FIG. 7 shows the relationship between the refrigerant temperature and the air temperature during the cooling operation cycle, the heating operation cycle and the dehumidification operation cycle. Explaining only during the cooling operation cycle, in the rear heat exchanger portion 17B, which is on the upstream side of the dehumidification throttle valve 5, the refrigerant is conducted in the gas-liquid two-phase state in the windward row Ka to exchange heat with the heat exchange air. Along with that, the temperature drops. The gas-liquid two-phase ratio also changes while the refrigerant is conducting in the leeward side row Kb of the rear heat exchanger portion 17B, and the refrigerant temperature further decreases.

The front heat exchanger section 1 which is the downstream side of the throttle valve 5
In 7A, the refrigerant is guided to the windward row Ka,
At this time, the change in the gas-liquid two-phase ratio of the refrigerant still continues, and the temperature further decreases. When the refrigerant is guided to the leeward side row Kb of the front heat exchanger portion 17A, the gas-liquid two-phase ratio of the refrigerant changes, and the temperature further decreases. During the heating operation and the dehumidifying operation cycle, a detailed description is omitted, but there is a change in the state of the refrigerant and a change in the temperature in the front and rear heat exchanger parts 17A and 17B as shown in the figure. .

Further, during the cooling operation cycle, as the refrigerant in the indoor heat exchanger 17 changes from the liquid phase to the gas phase, the structure of the refrigerant flow passage is changed to 2 in the rear heat exchanger section 17B.
Since there are four rows of the front heat exchanger portion 17A from the rows, the refrigerant circulation pressure is reduced. During the heating operation cycle, as the refrigerant in the indoor heat exchanger 17 changes from the gas phase to the liquid phase, the refrigerant flow path configuration changes to 4 of the front heat exchanger section 17A.
There are two rows of the rear heat exchanger portion 17B from the row. That is,
The flow path becomes a coolant flow channel corresponding to the density of the coolant, and the flow resistance is reduced.

Further, during the cooling operation cycle, the flow of the refrigerant in the indoor heat exchanger 17 is configured to move from the heat exchange pipe P in the windward row Ka to the heat exchange pipe P in the leeward row Kb. Windward row Ka with relatively high pressure
Therefore, the refrigerant temperature smoothly decreases as it is conducted to the leeward side row Kb which becomes lower than this. At the same time, since the temperature of the heat exchange air flowing through the indoor heat exchanger 17 also decreases due to the heat exchange, the temperature difference between the heat exchange air and the refrigerant can be made relatively large from the windward side to the leeward side. The exchange action is performed efficiently.

Further, during heating, since the refrigerant is guided from the heat exchange pipe P of the leeward row Kb to the heat exchange pipe P of the leeward row Ka, the leeward row Kb having a relatively high pressure. The temperature of the refrigerant decreases as the pressure is introduced from the side to the windward row Ka where the pressure decreases. At the same time, the temperature of the heat exchange air flowing through the indoor heat exchanger 17 also rises along with the heat exchange, so that the temperature difference between the heat exchange air and the refrigerant can be made relatively large from the windward side to the leeward side, and the heat exchange can be performed. The action is performed efficiently.

Further, during the dehumidifying operation cycle, the refrigerant is branched and flows from the dehumidifying throttle valve 5 to the four parallel flow paths formed in the front heat exchanger portion 17A, and the front heat exchanger portion 17A is flown.
The cooling and dehumidifying action can be efficiently performed over the whole. Therefore, the reheat dehumidifying function can be sufficiently exerted even in a model having a large capacity of 5.6 KW or more. FIG. 8 shows an indoor heat exchanger A having the conventional dehumidification valve B described above and having a refrigerant flow passage configuration changing from one row to two rows (1-2 passes);
In the indoor heat exchanger 17 with the dehumidifying throttle valve (dehumidification valve) 5 of the present invention and the refrigerant flow passage configuration changing from two rows to four rows (2-4 passes), the cooling capacity with respect to the compressor rotation speed ratio FIG. When the conventional configuration and the configuration of the present invention are compared, there is a difference in refrigerant capacity of 1.3 to 1.6 KW at the same compressor rotation speed ratio. That is, by adopting the refrigerant channel structure of the present invention, the cooling capacity can be greatly increased.

FIG. 3 is a schematic sectional view of the dehumidifying throttle valve 5 which constitutes the above throttle device. This dehumidifying throttle valve 5 is
Valve body 25 and valve body 26 housed in the valve body 25
And an electromagnetic drive mechanism 27 for vertically driving the valve body 26,
The valve seat 2 which is opened and closed with the vertical drive of the valve body 26.
Eight. Further, an inlet refrigerant pipe 6a for introducing and guiding the refrigerant into the valve body 25 during the cooling / dehumidifying operation cycle is connected to the side wall of the valve body 25, and the lower end portion of the valve body 25 has the refrigerant during the cooling / dehumidifying operation cycle. An outlet refrigerant pipe 6b is connected to guide the valve from the valve body 25 to the outside.

In the valve body 25, the inlet refrigerant pipe 6a is provided.
A main flow path is formed in which the refrigerant introduced into the valve body 25 is guided to the outlet refrigerant pipe 6b via the valve seat 28. A cutout groove 29 is provided in the valve seat, and even if the valve body 26 closes the valve seat 28 as shown in the figure, the presence of the cutout groove 29 ensures a certain flow rate. It has become so. That is, when the valve body 26 closes the valve seat 28, a throttle channel is formed through which the refrigerant is guided through the cutout groove 29. The throttle channel is designed to function during the dehumidifying operation cycle, and the refrigerant flows through the notch groove 29 to secure a predetermined throttle amount.

FIG. 4 is a perspective view showing a piping structure around the dehumidifying throttle valve 5. During the cooling / dehumidifying operation cycle,
Here, the inlet refrigerant pipe 6a for introducing and guiding the refrigerant from the rear heat exchanger portion 17B (not shown) to the dehumidification throttle valve 5 is
It is straight and is connected to the side wall of the dehumidification throttle valve 5 in a horizontal posture. On the other hand, the outlet refrigerant pipe 6b for guiding and guiding the refrigerant from the dehumidification throttle valve 5 is connected to the lower end of the dehumidification throttle valve 5, extends downward, is bent, and extends horizontally. The end of this horizontally extending portion has a U-shaped distribution pipe 8
Is connected to the central part of.

The outlet refrigerant pipes 6c, 6c connected to both ends of the U-shaped distribution pipe 8 communicate with a flow passage divided into upper and lower parts of the front heat exchanger portion 17A (not shown here). A straight and horizontally extending portion of the inlet refrigerant pipe 6a is inserted between the outlet refrigerant pipes 6c, 6c connected to both ends of the U-shaped distribution pipe 7. in this way,
In the piping configuration around the dehumidifying throttle valve 5, the inlet refrigerant pipe 6a is inserted between the outlet refrigerant pipes 6c, 6c connected to both ends of the U-shaped distribution pipe 8, so that With the indoor heat exchanger 17 arranged in the machine body 11, the piping configuration is made compact, which leads to downsizing of the indoor machine body 11.

The outlet refrigerant pipe 6c connected to the dehumidifying throttle valve 5 is bent substantially vertically from the vertical direction to the horizontal direction immediately after being drawn out from the throttle valve 5, and the refrigerant is bent at this bent portion. A centrifugal force is applied to the U-shaped flow dividing pipe 8 and then the U-shaped flow dividing pipe 8 is guided. That is, the refrigerant can be evenly distributed to the outlet refrigerant pipes 6c connected to both ends of the U-shaped distribution pipe 8, and the upper and lower refrigerant flow passages of the front heat exchanger portion 17A connected to the outlet refrigerant pipes 6c can be connected. The shunt action is effectively performed.

FIG. 5 shows the refrigerant inlet portion 7a of the rear side heat exchanger portion 17B constituting the indoor heat exchanger 17 and the piping configuration around it, and FIG. 6 shows a part of it in an enlarged manner. 3 and 4 are perspective views, respectively. As described above, the rear heat exchanger section 17B includes the main heat exchanger section 17b1 having two rows of piping flow paths and the auxiliary heat exchanger 17 having one row of piping paths.
b2 and the refrigerant inlet portion 7a is provided in the U-shaped pipe Pa of the auxiliary heat exchanger portion 17b2.

The inlet refrigerant pipe 6d connected to the refrigerant inlet portion 7a extends along the longitudinal direction of the surface of the auxiliary heat exchanger portion 17b2, is bent in a U-shape at a predetermined portion, and then the auxiliary heat exchanger portion 17b2 is bent. It is connected to the U-shaped pipe Pa of the exchange part 17b2. The inlet refrigerant pipe 6d is connected to the auxiliary heat exchanger portion 17b2.
Will be located on the windward side of the auxiliary heat exchanger portion 17b.
Heat exchange with heat exchange air prior to 2. That is, during the cooling operation cycle, the heat is exchanged in the inlet refrigerant pipe 6d to some extent and then introduced into the auxiliary heat exchanger portion 17b2, and the heat exchange efficiency is improved.

Since the inlet refrigerant pipe 6d is bent and formed in an L shape at a portion immediately before being connected to the auxiliary heat exchanger portion 17b2, a centrifugal force is applied to the refrigerant at this bent portion, and then U is applied.
It leads to the character tube Pa. The U-shaped pipe Pa divides the refrigerant evenly, and effectively divides the refrigerant flow path from the auxiliary heat exchanger portion 17b2 to the main heat exchanger portion 17b1. In addition, the diameter of the heat exchange pipe P constituting the indoor heat exchanger 17 and the diameter of the refrigerant pipe 6 around the indoor heat exchanger 17 connected to the heat exchange pipe P are different from each other.

To explain further, the refrigerant pipe 6d connected to the refrigerant inlet portion 7a in the rear heat exchanger portion 17B, the rear heat exchanger portion 17B and the inlet portion 5a of the dehumidifying throttle valve 5 are communicated with each other. The refrigerant pipe 6a, the outlet refrigerant pipes 6b and 6c connected to the outlet portion 5b of the throttle valve 5, and the U-shaped diversion pipe 8
The refrigerant pipe 6e connected to the outlet portion 7b of the front heat exchanger portion 17A has a diameter (φ) of 8 mm.

On the other hand, together with the fins P, the front heat exchanger portion 17A and the rear heat exchanger portion 17 of the indoor heat exchanger 17 are arranged.
The heat exchange pipe P constituting B has a diameter (φ) of 6.3 m.
m is used. That is, the indoor heat exchanger 1
The refrigerant pipe 6 for connection around 7 is a heat exchange pipe P
Since the one having a diameter larger than the diameter is used, the refrigerant is connected to the connecting refrigerant pipe 6 and the front and rear heat exchanger parts 17A and 17B.
It is possible to suppress a sudden change in pressure when conducting the connection with the heat exchange pipe P and to reduce noise generation.

[0044]

As described above, the present invention can efficiently perform both the refrigerant circulation action and the heat exchange air circulation action in each of the cooling operation, the dehumidifying operation, and the heating operation, and is sufficient even for a large-capacity model. It is possible to provide an air conditioner that can exert the reheat dehumidification function.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an indoor unit of an air conditioner, showing an embodiment of the present invention.

FIG. 2 is a diagram showing a refrigerant flow path configuration of an indoor heat exchanger, an air conditioner, and a refrigeration cycle configuration thereof showing the embodiment.

FIG. 3 is a schematic cross-sectional view of a dehumidifying throttle valve showing the same embodiment.

FIG. 4 is a perspective view illustrating a piping configuration around a dehumidifying throttle valve according to the embodiment.

FIG. 5 is a perspective view illustrating a pipe configuration around a rear heat exchanger portion of the indoor heat exchanger according to the embodiment.

FIG. 6 is an enlarged perspective view showing a part of a piping configuration around a rear heat exchanger section showing the embodiment.

FIG. 7 is a diagram illustrating changes in the refrigerant temperature of the indoor heat exchanger and the temperature of circulating heat exchange air in the cooling operation, the heating operation, and the dehumidifying operation, showing the embodiment.

FIG. 8 is a characteristic diagram of the cooling capacity corresponding to the rotation speed ratio of the compressor in the present invention and the indoor heat exchanger provided with the refrigerant passage of the conventional structure.

FIG. 9 is a view showing a conventional refrigerant flow path configuration of an indoor heat exchanger.

[Explanation of symbols] 30 ... Outdoor unit body, 11 ... Indoor unit body, 6 ... Refrigerant piping, 1 ... Compressor, 2 ... four-way switching valve, 3 ... Outdoor heat exchanger, 17 ... Indoor heat exchanger, F ... Fin, P ... Heat exchange pipe, 17A ... Front heat exchanger section, 17B: rear heat exchanger part, 5 ... Throttle valve for dehumidification, 8 ... U-shaped distribution pipe, 7a ... Refrigerant inlet, 7b ... Refrigerant outlet.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F24F 1/00 391C (72) Inventor Koji Wada 336 Tatehara, Fuji-shi, Shizuoka Toshiba Faria (term) Reference) 3L051 BE05 BE07 BF01

Claims (3)

[Claims] 1. A heat pump refrigeration cycle comprising an outdoor unit main body and an indoor unit main body, which are arranged in a distributed manner in the outdoor unit main body and the indoor unit main body so that switching between cooling operation and heating operation is possible. A compressor, a four-way switching valve, an outdoor heat exchanger, an expansion means, and an indoor heat exchanger, which are communicated with each other through a refrigerant pipe, are provided, and the indoor heat exchangers are arranged side by side with a predetermined interval. A fin tube type consisting of a plurality of fins and a heat exchange pipe that penetrates these fins and forms a flow path through which a refrigerant is conducted inside, wherein heat exchange air flows between the fins, This indoor heat exchanger has an inverted V-shape in a side view from a front heat exchanger portion arranged to face a front surface portion of an indoor unit body and a rear heat exchanger portion arranged to face an upper surface portion. Formed in the shape of In the middle part of the refrigerant flow path communicating with the rear heat exchanger part, the front heat exchanger part is caused to perform the condensation action of the refrigerant, and the rear heat exchanger part is caused to perform the evaporation action of the refrigerant to dehumidify. A throttling device that establishes an operation cycle is provided, and in the cooling / dehumidifying operation cycle, a rear heat exchanger unit is provided on the upstream side of the refrigerant passage of the expansion device, and a front heat exchanger portion is provided on the downstream side of the refrigerant passage of the throttling device. In the rear heat exchanger portion, a refrigerant inlet portion is provided on the windward side of the heat exchange air flow, and the refrigerant inlet portion is diverted and guided in two front and rear directions. The flow path is configured to be introduced into the expansion device after being joined to the expansion device, and the refrigerant discharged from the expansion device is flow-divided in two directions to be introduced into the front heat exchanger section. In the above-mentioned front heat exchanger part, the upper part of It is equipped with a parallel refrigerant channel divided into two below, and on the windward side of the heat exchange air flow in each of the upper and lower channels,
Refrigerant piping that introduces the refrigerant that is branched and guided from the expansion device is connected, and in each of the upper and lower flow paths, there are provided parallel flow paths that branch out in the two upper and lower directions and join at the leeward side of the heat exchange airflow before being led out. An air conditioner characterized by that. 2. A dehumidifying device having a main flow passage opened during a cooling operation cycle and closed during a dehumidifying operation cycle, and a throttle passage for conducting a refrigerant during the dehumidifying operation cycle to secure a predetermined throttle amount. The refrigerant pipe for introducing and guiding the refrigerant into the dehumidifying throttle valve during the cooling / dehumidifying operation cycle is straight and connected to the dehumidifying throttle valve side wall in a substantially horizontal posture. The refrigerant pipe that guides the refrigerant from the
It is connected to the lower end of the dehumidification throttle valve, extends downward, and is then bent in the horizontal direction. Furthermore, this horizontal end is connected to the substantially central portion of the U-shaped distribution pipe whose refrigerant pipes are connected to both ends. Between the refrigerant pipes connected to both ends of this U-shaped distribution pipe,
The air conditioner according to claim 1, wherein a refrigerant pipe for introducing and guiding a refrigerant is inserted into the dehumidification throttle valve. 3. A refrigerant pipe connected to a refrigerant inlet of the rear heat exchanger, a refrigerant pipe communicating the outlet of the rear heat exchanger with the inlet of the expansion device, an outlet of the expansion device and a front heat exchanger. The refrigerant pipe provided with a U-shaped distribution pipe communicating with the inlet of the section, and the refrigerant pipe connected to the refrigerant outlet of the front heat exchanger unit are
The diameter thereof is larger than the diameter of the heat exchange pipe constituting the indoor heat exchanger.
Air conditioner described.