JP2005016933A - Indoor unit for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indoor unit for an air conditioner capable of improving the heat exchanging efficiency at low cost while securing the maximum discharged-air volume. <P>SOLUTION: This indoor machine for the air conditioner comprises a main heat exchanger 11 placed approximately in the truncated chevron shape, auxiliary heat exchangers 11 mounted at both sides in a state of holding the main heat exchanger therebetween, and a blower 7 mounted at both sides in a state of holding the main heat exchanger and the auxiliary heat exchangers therebetween. The air is sucked from a lower side of the main heat exchanger by the blower, and blown out downward after successively passed through the main heat exchanger and the auxiliary heat exchangers. A refrigerant pipe 17 of the main heat exchanger is placed on both of upper and lower halves of the indoor main body 1, and a refrigerant pipe 22 of the auxiliary heat exchanger is placed on an area of the upper half of the indoor main body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an indoor unit of an air conditioner including a heat exchanger and a blower.

Conventionally, an indoor unit of an air conditioner is described in, for example, Patent Document 1 and Patent Document 2, and heat exchangers are arranged on both sides in a substantially C shape. And in the indoor unit of the air conditioning apparatus of patent document 1, the heat exchanger is arrange | positioned 1 each on both sides. Moreover, in the indoor unit of the air conditioning apparatus of patent document 2, two heat exchangers are respectively arranged on both sides.
Japanese Patent Publication No. 6-39971 Japanese Patent No. 3043112

  By the way, in recent years, it has been required to improve the COP (coefficient of performance) and to perform energy saving design by increasing the heat exchange efficiency of the indoor unit of the air conditioner. However, as in the indoor unit of the air conditioner in Patent Document 1, if one heat exchanger is used at a time, the heat exchange capacity of the heat exchanger is small and COP (coefficient of performance) cannot be improved.

  On the other hand, when two heat exchangers having substantially the same structure are stacked as in the indoor unit of the air conditioner in Patent Document 2, the heat exchange efficiency is improved, but the overlapping heat exchangers prevent the passage of air. There is a risk that the amount of air discharged from the outlet will be reduced. As a result, it is necessary to increase the capacity of the blower, and the cost increases. That is, the second heat exchanger that overlaps the first heat exchanger is different from the first heat exchanger because it exchanges heat with the air that has passed through the first heat exchanger. Characteristics are required. Nevertheless, since the indoor unit of the air conditioner of Patent Document 2 has substantially the same structure as the first heat exchanger, the heat exchange efficiency, the discharge air volume and the like are reduced, and the manufacturing cost is increased. There is a risk of

  This invention is for solving the above subjects, and it aims at providing the indoor unit of the air conditioning apparatus which can improve heat exchange efficiency at low cost, ensuring the discharge air volume as much as possible. Yes.

  The invention according to claim 1 includes a main heat exchanger (11) arranged in a substantially C shape, and auxiliary heat exchangers (12) arranged on both sides with the main heat exchanger interposed therebetween, A blower (7) disposed on both sides of the main heat exchanger and the auxiliary heat exchanger. The blower sucks air from the lower side of the main heat exchanger, and the sucked air is main heat exchange. After passing through the heat exchanger and the auxiliary heat exchanger in this order. And the refrigerant | coolant piping (17) of the said main heat exchanger is piped in both the area | regions of the upper half and lower half of an indoor unit main body (1), and the refrigerant | coolant piping (22) of the said auxiliary heat exchanger is It is characterized by being piped in the upper half area of the indoor unit main body.

  According to a second aspect of the present invention, in the indoor unit of the air conditioner according to the first aspect, the refrigerant pipe of the auxiliary heat exchanger is thicker than the refrigerant pipe of the main heat exchanger.

  According to a third aspect of the present invention, in the indoor unit for an air conditioner according to the first aspect, the auxiliary heat exchanger has a fin (24) whose fin (24) has a pitch (P2) of the fin (19) of the main heat exchanger. It is characterized by being larger than the pitch (P1).

  According to a fourth aspect of the present invention, in the indoor unit of the air conditioner according to the first aspect, the refrigerant pipe of the main heat exchanger is piped while meandering between both tube plates (16) of the main heat exchanger. And provided in a row in the width direction of the tube sheet.

  According to a fifth aspect of the present invention, in the indoor unit of the air conditioner according to the first aspect, the refrigerant piping of the main heat exchanger is divided at the middle thereof so that the first connection portion (36) and the second connection portion are separated. A connection part (37) is formed, one end of the refrigerant pipe of the auxiliary heat exchanger is connected to the first connection part, and the second connection part is connected to the other end of the refrigerant pipe of the auxiliary heat exchanger. Features.

  According to the first aspect of the present invention, since the main heat exchanger and the auxiliary heat exchanger are provided, the heat exchange efficiency can be improved by the auxiliary heat exchanger. And the refrigerant | coolant piping of this auxiliary heat exchanger is piped in the area | region of the upper half of the indoor unit main body with much air volume, and can improve heat exchange efficiency effectively with little piping amount. As a result, the manufacturing cost can be reduced. In addition, since the refrigerant pipe of the auxiliary heat exchanger is not provided in the lower half region of the indoor unit body, the air flow is prevented from being obstructed by the refrigerant pipe of the auxiliary heat exchanger. A sufficient air volume can be secured.

  According to the invention of claim 2, when the refrigerant pipe of the auxiliary heat exchanger is thicker than the refrigerant pipe of the main heat exchanger, the refrigerant flow in the auxiliary heat exchanger is slowed and The surface area can be increased. As a result, the heat exchange efficiency can be further improved.

  According to the invention described in claim 3, when the pitch of the fins of the auxiliary heat exchanger is larger than the pitch of the fins of the main heat exchanger, the fins of the auxiliary heat exchanger obstruct the air flow. As a result, it is possible to ensure a sufficient amount of air passing through the main heat exchanger and the auxiliary heat exchanger.

  According to the invention described in claim 4, since the refrigerant pipes of the main heat exchanger are in two rows and the refrigerant pipes of the auxiliary heat exchanger are in one row, the refrigerant pipes of the heat exchanger are in three rows in the upper part. In the lower part, there are two rows. As a result, a large amount of refrigerant piping can be provided on the upper part of the heat exchanger with a large air volume, and the heat exchange efficiency can be improved with a small piping length.

  According to the fifth aspect of the present invention, the refrigerant piping of the main heat exchanger is divided at its middle portion to form the first connection portion and the second connection portion, and auxiliary heat exchange is formed in the first connection portion. When one end of the refrigerant pipe of the heat exchanger is connected and the second connection is connected to the other end of the refrigerant pipe of the auxiliary heat exchanger, the refrigerant pipe of the auxiliary heat exchanger is the refrigerant of the main heat exchanger The refrigerant is connected in the middle of the pipe and has a high cooling capacity. As a result, it is possible to improve the heat exchange efficiency of the auxiliary heat exchanger disposed in the upper part where the air volume is large, and the heat exchange efficiency of the entire heat exchanger is increased. By the way, when the refrigerant pipe of the auxiliary heat exchanger is connected to the downstream side of the refrigerant pipe of the main heat exchanger, the refrigerant that has exchanged heat in the main heat exchanger and has exhausted cooling capacity is supplied to the auxiliary heat exchanger. Thus, the heat exchange efficiency of the auxiliary heat exchanger decreases.

  Next, an embodiment of an indoor unit of an air conditioner according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of an air conditioner according to the present invention. FIG. 2 is a cross-sectional view of the indoor unit. FIG. 3 is a refrigerant circuit diagram of the air conditioner. 4A and 4B are explanatory views of the heat exchanger, in which FIG. 4A is a diagram of the main part of the main heat exchanger, and FIG. 4B is a diagram of the main part of the auxiliary heat exchanger. In FIG. 2, the grill frame is not shown in cross section but is viewed from the front side. In this specification, the longitudinal direction of the ceiling-embedded air conditioner is the left-right direction. That is, the direction in which both tube sheets are aligned is the left-right direction.

  The indoor unit body 1 of the ceiling-embedded air conditioner is installed in the ceiling of the air-conditioned room, and a grill frame 4 having a suction port 2 and an outlet 3 is attached to the lower end of the indoor unit body 1. A grill is detachably provided at the suction port 2 of the grill frame 4.

  Inside the indoor unit main body 1, a substantially C-shaped heat exchange unit 6 and a cross flow fan 7 as a blower are provided, and the heat exchange unit 6 is disposed above the suction port 2. .

  A pair of the cross flow fans 7 are provided with a substantially C-shaped heat exchange unit 6 interposed therebetween, and after sucking indoor air from the suction port 2 of the grill frame 4 and passing this air through the heat exchange unit 6, The air is blown into the room from the air outlet 3 of the grill frame 4. Due to the characteristics of the cross flow fan 7, the amount of air flowing through the upper part of the heat exchange unit 6 is larger than the amount of air flowing through the lower part of the heat exchange unit 6.

  The heat exchange unit 6 includes a pair of front and rear main heat exchangers 11 and a pair of front and rear auxiliary heat exchangers 12 arranged in a substantially C shape. The main heat exchanger 11 is disposed on both sides of the main heat exchanger 11 in a state of sandwiching the main heat exchanger 11 in a substantially C shape. As shown in FIG. 4A, each of the main heat exchangers 11 is provided with a refrigerant pipe 17 meandering between the left and right tube plates 16, and a large number of pipes 16 between the tube plates 16. Fins 19 are arranged. As shown in FIG. 2, the refrigerant pipes 17 of the main heat exchanger 11 are provided in both the upper half and the lower half of the indoor unit body 1 and are multi-staged in the longitudinal direction of the tube sheet 16 ( In this embodiment, two rows are provided in the width direction of the tube sheet 16.

  As shown in FIG. 4 (b), each auxiliary heat exchanger 12 is provided with a refrigerant pipe 22 meandering between the left and right tube plates 21, and a large number between the tube plates 21. Fins 24 are arranged. As shown in FIG. 2, the refrigerant pipe 22 of the auxiliary heat exchanger 12 is provided in the upper half area of the indoor unit body 1 and is provided in the lower half area of the indoor unit body 1. There is nothing. The refrigerant pipes 22 of the auxiliary heat exchanger 12 are provided in four stages in the longitudinal direction of the tube sheet 21 and in one row in the width direction of the tube sheet 21.

  The diameter (inner diameter) of the refrigerant pipe 22 of the auxiliary heat exchanger 12 is larger than the diameter (inner diameter) of the refrigerant pipe 17 of the main heat exchanger 11. The pitch P2 that is the interval between the fins 24 of the auxiliary heat exchanger 12 is larger than the pitch P1 that is the interval between the fins 19 of the main heat exchanger 11.

  An outline of the refrigerant circuit of the air conditioner will be described with reference to FIG. The compressor 31 compresses the gaseous refrigerant and flows it to the condenser 33 via the four-way switching valve 32. The refrigerant cooled by the condenser 33 is expanded by a throttle valve 34 that is an electromagnetic valve serving as a pressure reducing device, branches, and flows into the first refrigerant pipe 17 a of the pair of main heat exchangers 11. And the refrigerant | coolant heat-exchanged by the 1st refrigerant | coolant piping 17a of the main heat exchanger 11 merges, the strainer 43 for dry capillary tubes, and the 2nd refrigerant | coolant piping 17b of the main heat exchanger 11 pass through the dry capillary tube 44. Flow into. As described above, the refrigerant pipe 17 of the main heat exchanger 11 includes the first refrigerant pipe 17a and the second refrigerant pipe 17b.

  Further, a bypass passage 46 is provided in parallel with the strainer 43 and the dry capillary tube 44, and an electromagnetic valve 47 for dehumidifying operation switching is provided in the bypass passage 46.

  The electromagnetic valve 47 is closed during the dehumidifying operation, and the refrigerant flows to the strainer 43 and the dry capillary tube 44. On the other hand, when the dehumidifying operation is not performed, the electromagnetic valve 47 is opened to bypass the strainer 43 and the dry capillary tube 44. And let the coolant flow. And the above-mentioned 2nd refrigerant | coolant piping 17b is divided | segmented into the intermediate part, and the 1st connection part 36 and the 2nd connection part 37 are formed.

  One end portion of the refrigerant pipe 22 of the auxiliary heat exchanger 12 is connected to the first connection portion 36, and the other end portion of the auxiliary heat exchanger 12 is connected to the second connection portion 37. Accordingly, the refrigerant that has flowed into the one end portion of the second refrigerant pipe 17b of the main heat exchanger 11 flows around the refrigerant pipe 22 of the auxiliary heat exchanger 12 and then flows out from the other end of the second refrigerant pipe 17b.

  And the refrigerant | coolant heat-exchanged by the 2nd refrigerant | coolant piping 17b of the main heat exchanger 11 and the auxiliary heat exchanger 12 flows out from the main heat exchanger 11, and passes to the compressor 31 via the four-way switching valve 32 and the accumulator 49. I'm back. The four-way switching valve 32 flows the refrigerant from the compressor 31 to the condenser 33 and the refrigerant from the main heat exchanger 11 to the accumulator 49 during the cooling operation and the dehumidifying operation. During the heating operation, the four-way switching valve 32 is switched so that the refrigerant from the compressor 31 flows to the main heat exchanger 11 and the refrigerant from the condenser 33 flows to the accumulator 49.

  Thus, when the compressor 31 operates, the refrigerant flows through the refrigerant pipe 17 of the main heat exchanger 11 and the refrigerant pipe 22 of the auxiliary heat exchanger 12. On the other hand, when the cross flow fan 7 is operated, air flows through the space between the tube plates 16 in the main heat exchanger 11 and the space between the tube plates 21 in the auxiliary heat exchanger 12 as described above. And the refrigerant | coolant of the main heat exchanger 11 and the auxiliary heat exchanger 12 performs heat exchange with the flow of the air which passes the heat exchangers 11 and 12.

  As described above, in the above embodiment, the refrigerant pipe 22 of the auxiliary heat exchanger 12 is piped in the upper half area of the indoor unit body 1 with a large air volume, and the lower half area of the indoor unit body 1. The heat exchange efficiency is improved as compared with the case where the pipes are connected. And compared with the case where the refrigerant | coolant piping 22 of the auxiliary | assistant heat exchanger 12 is piped in both the upper half area | region and lower half area | region of the indoor unit main body 1, it is piped only to the area | region of the upper half of the indoor unit main body 1. Therefore, the piping length can be shortened, and the manufacturing cost can be reduced.

  And since the diameter of the refrigerant | coolant piping 22 of the auxiliary heat exchanger 12 is large, while the speed of the refrigerant | coolant which flows through the refrigerant | coolant piping 22 falls, the surface area of refrigerant | coolant piping increases and heat exchange efficiency further improves. In addition, since the pitch P2 of the fins 24 of the auxiliary heat exchanger 12 is large, the obstruction of the air flow is reduced, and the reduction of the air volume can be prevented as much as possible.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Can be done. Examples of modifications of the present invention are illustrated below.
(1) The blower is preferably a cross flow fan, but the type and structure of the blower can be changed as appropriate.
(2) The air conditioner is a ceiling-embedded air conditioner, but may be of other types.

FIG. 1 is a perspective view of an air conditioner according to the present invention. FIG. 2 is a cross-sectional view of the indoor unit. FIG. 3 is a refrigerant circuit diagram of the air conditioner. 4A and 4B are explanatory views of the heat exchanger, in which FIG. 4A is a diagram of the main part of the main heat exchanger, and FIG. 4B is a diagram of the main part of the auxiliary heat exchanger.

Explanation of symbols

P1 Main heat exchanger fin pitch P2 Auxiliary heat exchanger fin pitch 1 Indoor unit body 7 Cross flow fan (blower)
DESCRIPTION OF SYMBOLS 11 Main heat exchanger 12 Auxiliary heat exchanger 16 Tube plate of main heat exchanger 17 Refrigerant piping of main heat exchanger 19 Fin of main heat exchanger 21 Tube plate of auxiliary heat exchanger 22 Refrigerant piping of auxiliary heat exchanger 24 Auxiliary heat exchanger fins 36 First connection 37 Second connection

Claims (5)

A main heat exchanger arranged in a substantially C shape, an auxiliary heat exchanger arranged on both sides of the main heat exchanger, and both sides of the main heat exchanger and the auxiliary heat exchanger And a blower arranged in the
In the indoor unit of the air conditioner that blows down air after sucking air from the lower side of the main heat exchanger with the blower, passing the sucked air in order of the main heat exchanger and the auxiliary heat exchanger,
The refrigerant pipe of the main heat exchanger is piped in both the upper half and lower half areas of the indoor unit main body, and the refrigerant pipe of the auxiliary heat exchanger is piped in the upper half area of the indoor unit main body. An air conditioner indoor unit. The indoor unit of an air conditioner according to claim 1, wherein the refrigerant pipe of the auxiliary heat exchanger is thicker than the refrigerant pipe of the main heat exchanger. The indoor unit of an air conditioner according to claim 1, wherein the auxiliary heat exchanger has a fin pitch larger than a fin pitch of the main heat exchanger. The refrigerant pipes of the main heat exchanger are piped while meandering between the two pipe plates of the main heat exchanger, and are provided in two rows in the width direction of the pipe plates,
The refrigerant piping of the auxiliary heat exchanger is provided while being meandering between both tube plates of the auxiliary heat exchanger, and is provided in one row in the width direction of the tube plate. The indoor unit of the air conditioning apparatus described. The refrigerant pipe of the main heat exchanger is divided at its middle part to form a first connection part and a second connection part, and one end part of the refrigerant pipe of the auxiliary heat exchanger is connected to the first connection part. The indoor unit of an air conditioner according to claim 1, wherein the second connection portion is connected to the other end of the refrigerant pipe of the auxiliary heat exchanger.

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