JPH04222332A - Indoor machine for heat pump type air-conditioner - Google Patents

Abstract

PURPOSE:To obtain the comfortable sence of heating, by a method wherein the temperature of the air blown into a room is kept in a state of a high temperature even when a heating capacity is increased by increasing an air-flow rate blown-through an indoor machine during heating-operation. CONSTITUTION:In the time of heating, the air through an intake passes a heat- exchanger 35 having a refrigerant pipe-line 51 in which a high temp. refrigerant flows, following which an air-passage in an indoor machine 31 is separated into two parts, i.e., a lower air-passage 39 and an upper air-passage 41, which are independent each other. Lower and upper fans 45, 49 are respectively provided in the lower and upper air-passages 39, 41, and in the heat-exchanger 35, one part of the refrigerant pipe-line 51, which is on the inlet side of the refrigerant, is located at the position facing the lower air-passage 39, and the other part of the refrigerant pipe-line 51, which is on the outlet side of the refrigerant, is located at the position facing the upper air-passage 41.

Description

[Detailed description of the invention]

[Object of the invention]

0002

[Industrial Application Field] This invention relates to a heat exchanger equipped with refrigerant pipes into which high-temperature refrigerant discharged from a compressor flows during heating, and air which flows through the heat exchanger into the interior of an indoor unit. The present invention relates to an indoor unit of a heat pump air conditioner having a blower that sends out air to the outside of the indoor unit.

0003

2. Description of the Related Art Generally, a heat pump type air conditioner for home use has an outdoor unit 1 and an indoor unit 3, as shown in FIG. 4, and these are connected by a refrigerant pipe 5. The outdoor unit 1 is provided with a compressor, an outdoor heat exchanger, an outdoor fan 7, etc. (not shown). On the other hand, indoor unit 3 has
Indoor heat exchanger 9, indoor blower fan 13 rotated by motor 11, indoor temperature detection mechanism 15, heat exchanger detection mechanism 1
7, an inverter circuit, etc. are provided.

In such a heat pump air conditioner, during heating operation, the high temperature, high pressure refrigerant gas discharged from the compressor is cooled and condensed by exchanging heat with indoor air in the indoor heat exchanger 9, thereby generating indoor heat. This refrigerant was expanded to a low temperature and low pressure state by an expansion valve installed in the pipe between the exchanger 9 and the outdoor heat exchanger, and the expanded refrigerant was further evaporated by absorbing heat from the outside air in the outdoor heat exchanger. After that, the compressor sucks it, forming a cycle. The indoor heat exchanger 9 through which the high-temperature refrigerant passes is warmed by indoor air passing through it, and the warmed air is passed through the indoor ventilation fan 13.
The rotation of the unit sends the air into the room and heats the room.

On the other hand, during cooling operation, by switching a four-way valve (not shown), the flow of refrigerant within the cycle is reversed, causing the outdoor heat exchanger to function as a condenser and the indoor heat exchanger to function as an evaporator. form a cycle.

By the way, in order to increase the efficiency of the heat pump cycle, it is possible to lower the condensation temperature of the refrigerant in the condenser,
It is also effective to increase the evaporation temperature of the refrigerant in the evaporator and reduce the pressure difference before and after the compressor. For this purpose, the amount of air blown to the outdoor heat exchanger and the indoor heat exchanger 9 by the ventilation fans 7 and 13 of both the outdoor unit 1 and the indoor unit 3 may be increased.

Among these, regarding the indoor unit 3, in order to increase the amount of air blown by the indoor unit 3, the indoor air intake port should be made into a shape with less resistance, and the indoor ventilation fan 13 should be made into a shape with less resistance.
All you have to do is increase the rotation speed. However, indoor ventilation fan 1
If the number of revolutions is increased, the noise increases and the marketability of the air conditioner as a home heat pump air conditioner decreases. For this reason, as shown in FIG. 5, a blower fan 21 and a blower fan 23 are provided on the lower side and the upper side of the indoor unit 19, respectively, and a lower air outlet 25 is provided corresponding to the blower fan 21.
Upper blower ports 27 are provided corresponding to the blower fans 23, and the air passing through the heat exchanger 29 is transferred to the two blower fans 2.
By using a configuration that uses 1 and 23 to send it indoors,
When using one blower fan, it is possible to increase the amount of air blown without causing problems such as increasing the number of rotations and increasing noise.

[0008]

[Problem to be Solved by the Invention] However, if the air flow rate of the indoor unit is increased during heating operation, although the heating capacity is improved, the temperature of the blown air decreases even more, resulting in a large amount of low-temperature air being blown out. However, in general, the feeling of comfort during heating is expressed by the correlation between the feeling of warmth due to the temperature of the air hitting the skin and the feeling of air flow due to the speed of the air, and as the air volume increases and the wind speed increases, the feeling of heating worsens even at the same temperature. Therefore, there is a problem in that comfort during heating is rather reduced.

[0009] Accordingly, an object of the present invention is to maintain the temperature of the air blown into the room at a high temperature even if the amount of air blown by the indoor unit is increased during heating operation, thereby providing a comfortable feeling of heating.

[Configuration of the invention]

[0011]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a heat exchanger equipped with a refrigerant pipe into which high-temperature refrigerant discharged from a compressor flows during heating; In an indoor unit of a heat pump air conditioner, the air flow path inside the indoor unit of the air after passing through the heat exchanger is controlled by an air flow path that is independent of each other. divided into a first air flow path and a second air flow path, a first blower is provided in the first air flow path, and a second blower is provided in the second air flow path,
The heat exchanger has piping on the inflow side of the refrigerant disposed in a portion facing one of the first and second air flow paths, and refrigerant inlet piping is arranged in a portion facing the other air flow path. This is the arrangement of the outflow side piping.

0012

[Operation] In the indoor unit of the heat pump air conditioner configured as described above, the air that has passed through the heat exchanger is divided into two systems, the first air flow path and the second air flow path, and each divided air flow is divided into two systems: the first air flow path and the second air flow path. are sent into the room by the first and second blowers independently of each other. Since the refrigerant pipe on the inflow side of the refrigerant during heating is provided in the part facing one of the air flow paths, the air flow passing through the part where this refrigerant pipe is located has a high temperature immediately after being discharged from the compressor. It receives heat from the refrigerant gas and becomes high temperature. In addition, since the refrigerant piping on the outflow side of the refrigerant during heating is provided in the part facing the other air flow path, the air flow passing through the part where this refrigerant pipe is located is directed to the one air flow path. The air flowing through it rises to a lower temperature.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an indoor unit 31 of a heat pump air conditioner showing one embodiment of the present invention. This indoor unit 31 is provided with a heat exchanger 35 on the front side (left side in the figure) inside the casing 33, and the inside of the casing 33 on the downstream side of the air flow A with respect to the heat exchanger 35 is located on the inner wall surface of the casing 33. A partition wall 37 protruding from the approximate center toward the heat exchanger 35 separates a lower air flow path 39 as a first air flow path on the lower side in the figure and a second air flow path on the upper side in the figure. The upper air flow path 41 is divided into two systems.

A lower air outlet 43 that communicates with the lower air passage 39 and opens to the outside is provided at the lower part of the casing 33, and a first blower is provided near the lower air outlet 43 of the lower air passage 39. A lower blower fan 45 is arranged. On the other hand, an upper air outlet 47 that communicates with the upper air passage 41 and opens to the outside is provided at the upper part of the casing 33 .
An upper blower fan 49 as a second blower is arranged near the. These lower and upper blower fans 45,
The 49 drive motors (not shown) are configured so that their rotational speeds can be controlled independently.

The heat exchanger 35 includes a refrigerant pipe 51 into which high-temperature refrigerant discharged from a compressor (not shown) flows, and a heat transfer device that is attached to the refrigerant pipe 51 and receives heat from the high-temperature refrigerant passing through the refrigerant pipe 51. fins 53. A plurality of refrigerant pipes 51 are arranged in a direction perpendicular to the plane of the paper in FIG.
It is a continuous pipe of books. And the refrigerant pipe 51
In the figure, an inlet portion 55 for the refrigerant from the heating compressor is provided at the lower end side, and an outlet portion 57 for the refrigerant is provided at the upper end side of the refrigerant pipe 51. Furthermore, the heat transfer fins 53
A plurality of sheets are arranged at predetermined intervals in the direction in which the refrigerant pipe 51 extends.

In the indoor unit of the heat pump air conditioner configured as described above, the high temperature discharged from the compressor,
High-pressure refrigerant gas flows into the refrigerant pipe 51 from the inlet portion 55, and sequentially flows upward as shown by arrow B while repeating the flow in the direction perpendicular to the plane of the paper in FIG. It flows out of the indoor unit 31. Entrance section 5
Since the refrigerant immediately after flowing into the refrigerant 5 is in a high-temperature gaseous state, the heat transfer fins 53 at the portion facing the lower air flow path 39 are maintained at a high temperature due to sensible heat at this time. Due to this heat exchange using sensible heat, the refrigerant in the gas phase gradually becomes a two-phase state of gas and liquid phases, that is, a condensed state, and the temperature of the refrigerant decreases.This time, heat exchange is performed using latent heat, and the upper air Channel 41
The heat transfer fins 53 facing the lower air flow path 3
The temperature is lower than that of the heat transfer fins 53 at the portion facing 9.

On the other hand, when indoor air passes through the heat exchanger 35 as indicated by arrow A, it is divided into a lower air passage 39 and an upper air passage 41 by the partition wall 37 . The divided air is sent into the room from the lower air outlet 43 and the upper air outlet 47 as indicated by arrows D and U, respectively, by rotating lower and upper blower fans 45 and 49, respectively. Lower air flow path 3
The air passing through the upper air passage 41 passes through the heat exchanger 35 in the lower part, which is at a high temperature, and is blown out at a higher temperature. Since the air passes through the heat exchanger 35 in the upper part, it is blown out at a lower temperature than the air passing through the lower air passage 39.

In this state, by lowering the rotation speed of the lower blower fan 45 and reducing the amount of high-temperature air blown, the temperature of the air that directly hits the human body is maintained at a high level, improving the heating comfort. By increasing the rotation speed of the upper ventilation fan 49 and increasing the amount of air blown, the heat exchanger 35 in the upper part
The condensation temperature of the refrigerant becomes lower, making it possible to improve heating capacity. As a result, a comfortable feeling of heating can be obtained while improving the heating capacity.

FIG. 2 is a sectional view of an indoor unit of a heat pump air conditioner showing another embodiment of the present invention. In this embodiment, the refrigerant pipes 51 of the indoor exchanger 35 are arranged in two rows in the air flow direction shown by arrow A. Refrigerant pipe 51
The refrigerant inlet 55 is located slightly below the center of the heat exchanger 35 in the vertical direction, and the refrigerant flowing from this refrigerant inlet 55 during heating flows in the direction of arrow C in FIG. As shown, it flows downward, and after reaching the lowest end, it flows diagonally downward to the left as shown by arrow E, and then sequentially flows upward as shown by arrow F. When the refrigerant flowing upward reaches the center of the heat exchanger 35, it flows diagonally upward to the right as shown by arrow G, and then flows upward as shown by arrow H. When the refrigerant reaches the upper end of the heat exchanger 35, it flows diagonally upward to the left in the direction of arrow J, and then flows downward as indicated by arrow K. When this downward flow reaches approximately the center of the heat exchanger 35, the refrigerant passes through the heat exchanger 35.
The refrigerant flows out of the indoor unit 31 from the refrigerant outlet 57 located slightly above the vertical center of the refrigerant.

[0021] Due to such a flow of refrigerant, the heat exchanger 3
The air flow passing through the heat exchanger 3 in the lower part flows countercurrently to the refrigerant flow in both the lower air flow path 39 and the upper air flow path 41, and exchanges heat with the refrigerant flow.
5, the temperature of the blown air can be further increased, and the heating capacity of the upper heat exchanger 35 can be further improved.

FIG. 3 is a sectional view of an indoor unit of a heat pump air conditioner showing still another embodiment of the present invention. In this embodiment, the opening degrees of the louvers 59 and 61 provided at the lower air outlet 43 and the upper air outlet 45 are independently controlled to make the passage resistance of each air outlet 43 and 45 variable. The rest of the structure is the same as that of the embodiment shown in FIGS. 1 and 2, and the same components as in these embodiments are given the same reference numerals. With this configuration, if the air flow rate of each air flow path 39, 41 is controlled independently in combination with the rotation speed control of the lower and upper blower fans 45, 49, even more fine-grained air volume control can be achieved. This makes it possible to achieve a more comfortable feeling of heating and an improvement in heating capacity.

[0023]

Effects of the Invention As explained above, according to the present invention, the air flow path after passing through the heat exchanger is divided into two systems, and the refrigerant flows into the portion facing one of the air flow paths. Since the piping on the side of the refrigerant is placed and the piping on the outflow side of the refrigerant is placed in the part facing the other air flow path, the air flowing through the one air flow path becomes high temperature due to the high temperature vapor phase refrigerant immediately after entering the air flow path, and is heated indoors. By directing this air to the human body, heating comfort can be improved. On the other hand, the air flowing through the other air flow path rises to a lower temperature than the one air flow path due to the refrigerant in a two-phase state of gas phase and liquid phase, which is lower in temperature than the gas phase state, and enters the room. By increasing the amount of air sent to the blower, the condensation temperature of the refrigerant in the heat exchanger is lowered, and the heating capacity can be improved. Thereby, it is possible to obtain a comfortable feeling of heating while improving the heating capacity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an indoor unit of a heat pump air conditioner showing an embodiment of the present invention.

FIG. 2 is a sectional view of an indoor unit of a heat pump air conditioner showing another embodiment of the present invention.

FIG. 3 is a sectional view of an indoor unit of a heat pump air conditioner showing still another embodiment of the present invention.

FIG. 4 is an overall configuration diagram of a conventional heat pump air conditioner.

5 is a sectional view of the indoor unit in the heat pump air conditioner shown in FIG. 4. FIG.

[Explanation of symbols]

31 Indoor unit 35 Heat exchanger 39 Lower air flow path (first air flow path) 41 Upper air flow path (second air flow path) 45 Lower blower fan (
1st blower) 49 Upper blower fan (second blower) 51 Refrigerant piping

Claims (1)

[Claims] Claim 1: A heat exchanger equipped with refrigerant piping into which high-temperature refrigerant discharged from a compressor flows during heating, and air passing through the heat exchanger and flowing into the indoor unit to the outside of the indoor unit. In an indoor unit of a heat pump air conditioner having an air blower, an air flow path in the indoor unit for the air after passing through the heat exchanger is divided into a first air flow path and a second air flow path that are independent of each other.
The heat exchanger is divided into the first and second air flow paths, a first blower is provided in the first air flow path, and a second blower is provided in the second air flow path. A pipe on the inflow side of the refrigerant is arranged at a portion facing one of the air flow paths, and a pipe on the outflow side of the refrigerant is arranged at a portion facing the other air flow path. Indoor unit of heat pump air conditioner.