WO2018168772A1

WO2018168772A1 - Heat exchanger having heat transfer pipe unit

Info

Publication number: WO2018168772A1
Application number: PCT/JP2018/009507
Authority: WO
Inventors: 透安東
Original assignee: ダイキン工業株式会社
Priority date: 2017-03-16
Filing date: 2018-03-12
Publication date: 2018-09-20

Abstract

A heat exchanger (10) is provided with a plurality of heat transfer pipe units (30) having a plurality of fins (32) and a plurality of heat transfer pipes (31). The plurality of heat transfer pipe units (30) are disposed at intervals along the arrangement direction (x) of the heat transfer pipe unit. In the heat transfer pipe units (30), the plurality of heat transfer pipes (31) extend in the extension direction (z) of the heat transfer pipe perpendicular to the arrangement direction (x) of the heat transfer pipe unit. In addition, the fins (32) and the heat transfer pipes (31) are disposed in an alternating manner along the spacing direction (y) of the heat transfer pipes perpendicular to the extension direction (z) of the heat transfer pipes and the arrangement direction (x) of the heat transfer pipe unit. Each of the plurality of fins (32) of the heat transfer pipe units (30) includes a first inclined portion (S1) inclined at a positive acute angle with respect to the spacing direction (y) of the heat transfer pipes and/or a second inclined portion (S2) inclined at a negative acute angle with respect to the spacing direction (y) of the heat transfer pipes.

Description

Heat exchanger with heat transfer tube unit

The present invention relates to a heat exchanger having a heat transfer tube unit.

Some heat exchangers used in air conditioners and the like have a heat transfer tube unit in which a heat transfer tube for flowing a refrigerant and a fin for performing heat exchange are formed as an integral member. The heat exchanger disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2006-105489) has a plurality of such heat transfer tube units. The plurality of heat transfer tube units are connected to a common header.

In order to improve the heat transfer performance between the air and the refrigerant, a plurality of heat transfer tube units are usually arranged at narrow intervals in the heat exchanger. When the air flow passes through the gap between the heat transfer tube units, the air flow is subjected to resistance, so that the amount of air passing is reduced, and as a result, the heat transfer performance may not be improved as intended. On the other hand, if the heat transfer tube units are arranged at wide intervals, a part of the air flow passes through the heat exchanger without contacting the heat transfer unit, so the heat transfer performance is not improved.

An object of the present invention is to improve the heat transfer performance of a heat exchanger.

The heat exchanger according to the first aspect of the present invention includes a plurality of heat transfer tube units each having a plurality of fins and a plurality of heat transfer tubes. The plurality of heat transfer tube units are arranged at intervals in the heat transfer tube unit arrangement direction. In each heat transfer tube unit, the plurality of heat transfer tubes extend in the heat transfer tube extension direction perpendicular to the heat transfer tube unit arrangement direction. In each heat transfer tube unit, the fins and the heat transfer tubes are alternately arranged in the heat transfer tube separation direction perpendicular to the heat transfer tube unit arrangement direction and the heat transfer tube extension direction. The plurality of fins of each heat transfer tube unit are each a first inclined portion that is inclined by a positive acute angle with respect to the heat transfer tube separation direction, and a second inclined portion that is inclined by a negative acute angle with respect to the heat transfer tube separation direction, At least one of the above.

According to this configuration, the airflow flowing along the heat transfer tube unit meanders according to the change in the inclination of the fins. As a result, the probability that the airflow contacts the fins is increased. Therefore, the heat transfer performance of the heat exchanger is improved.

The heat exchanger according to a second aspect of the present invention is the heat exchanger according to the first aspect, wherein the plurality of heat transfer tube units have at least one of a first heat transfer tube unit and a second heat transfer tube unit. Each of the plurality of fins of the first heat transfer tube unit is either a first fin having only a first inclined portion or a second fin having only a second inclined portion. The plurality of fins of the second heat transfer tube unit includes a third fin having both the first inclined portion and the second inclined portion.

According to this configuration, a specific mode in which a plurality of fins form a meandering shape is presented. The first heat transfer tube unit is easy to confirm the shape because the heat transfer tube is located at the top of the meandering. The second heat transfer tube unit occupies a small space because the heat transfer tube is not located at the top of the meandering.

The heat exchanger according to the third aspect of the present invention is the heat exchanger according to the second aspect, wherein the plurality of heat transfer tube units have both the first heat transfer tube unit and the second heat transfer tube unit.

According to this configuration, the heat exchanger has two types of heat transfer tube units. Therefore, by appropriately arranging the two types of heat transfer tube units, it is possible to improve the heat transfer performance while reducing the air resistance.

In the heat exchanger according to the fourth aspect of the present invention, in the heat exchanger according to the third aspect, the heat transfer tube belonging to the first heat transfer tube unit is the second heat transfer tube unit. Located between adjacent heat transfer tubes to which it belongs.

According to this configuration, the heat transfer tubes belonging to the respective heat transfer tube units are not close to each other at the location where the first heat transfer tube unit and the second heat transfer tube unit are adjacent to each other. Therefore, air resistance due to the proximity of the heat transfer tubes hardly occurs at that location.

A heat exchanger according to a fifth aspect of the present invention is the heat exchanger according to the third aspect or the fourth aspect, wherein the first heat transfer tube units and the second heat transfer tube units are alternately arranged in the heat transfer tube unit arrangement direction. ing.

According to this configuration, since the first heat transfer tube units and the second heat transfer tube units are alternately arranged, the heat transfer tubes belonging to the adjacent heat transfer tube units are not close to each other. Therefore, air resistance due to the proximity of the heat transfer tubes is less likely to occur.

A heat exchanger according to a sixth aspect of the present invention is the heat exchanger according to any one of the second to fifth aspects, wherein the plurality of fins of the first heat transfer tube unit are alternately arranged in the heat transfer tube separation direction. The first fin and the second fin are arranged.

According to this configuration, the inclination of the fins of the first heat transfer tube unit is alternately reversed. Therefore, a meandering shape with a small pitch can be formed.

A heat exchanger according to a seventh aspect of the present invention is the heat exchanger according to any one of the second to fifth aspects, wherein the plurality of fins of the first heat transfer tube unit are two in the heat transfer tube separation direction. These are the first fins and the second fins alternately arranged as described above.

¡According to this configuration, the inclination of the fins of the first heat transfer tube unit is reversed every one or more. Therefore, a meandering shape with a large pitch can be formed.

A heat exchanger according to an eighth aspect of the present invention is the heat exchanger according to any one of the second to sixth aspects, wherein the plurality of fins of the second heat transfer tube unit alternately have different projecting directions. The third fins are arranged in the heat transfer tube separation direction.

によ According to this configuration, the inclination of the fins of the second heat transfer tube unit is alternately reversed. Therefore, a meandering shape with a small pitch can be formed.

A heat exchanger according to a ninth aspect of the present invention is the heat exchanger according to any one of the second aspect, the third aspect, the fourth aspect, the fifth aspect, and the seventh aspect. The plurality of fins include all of the first fin, the second fin, and the third fin, and at least one first fin or second fin is disposed between the two third fins.

¡According to this configuration, the inclination of the fins of the second heat transfer tube unit is reversed every one or more. Therefore, a meandering shape with a large pitch can be formed.

In the heat exchanger according to the tenth aspect of the present invention, in the heat exchanger according to any one of the first to ninth aspects, the plurality of fins are curved surfaces.

According to this configuration, the plurality of curved fins form a smooth meandering shape and smoothly guide the air flow. Therefore, the air resistance can be further reduced.

The heat exchanger according to the first and second aspects of the present invention improves the heat transfer performance of the heat exchanger.

According to the heat exchanger according to the third aspect, the fourth aspect, the fifth aspect, and the tenth aspect of the present invention, the air resistance is reduced while improving the heat transfer performance.

The heat exchanger according to the sixth aspect, the seventh aspect, the eighth aspect, and the ninth aspect of the present invention provides variations of the meandering pitch of the fins of the heat transfer tube unit, and can select a heat exchanger suitable for the application. it can.

1 is a schematic diagram showing an outer shape of a heat exchanger 10. FIG. FIG. 3 is a schematic diagram showing an outer shape of a heat transfer tube unit 30. It is a schematic diagram of the heat exchanger tube unit group 35A of the heat exchanger 10 which concerns on 1st Embodiment. It is a mimetic diagram of heat exchanger tube unit group 35A 'of heat exchanger 10 concerning modification 1A of a 1st embodiment. It is a schematic diagram which shows the external shape of the heat exchanger 10 which concerns on the modification 1B of 1st Embodiment. It is a schematic diagram which shows the external shape of the heat exchanger tube unit 30 of the heat exchanger 10 which concerns on the modification 1B of 1st Embodiment. It is a schematic diagram of the heat exchanger tube unit group 35B of the heat exchanger 10 which concerns on 2nd Embodiment. It is a schematic diagram of the heat exchanger tube unit group 35C of the heat exchanger 10 which concerns on 3rd Embodiment. It is a schematic diagram of heat exchanger tube unit group 35D of the heat exchanger 10 which concerns on 4th Embodiment. It is a schematic diagram of the heat exchanger tube unit group 35E of the heat exchanger 10 which concerns on 5th Embodiment. It is a schematic diagram of the heat exchanger tube unit group 35F of the heat exchanger 10 which concerns on 6th Embodiment. It is a figure which shows the flat tube for heat exchange.

<First Embodiment>
(1) Overall Configuration FIG. 1 shows a heat exchanger 10 according to the first embodiment of the present invention. The heat exchanger 10 is used, for example, in an air conditioner or the like, and performs heat exchange between a refrigerant and air. The heat exchanger 10 includes a first pipe 41, a second pipe 42, a first header 21, a second header 22, and a heat transfer tube unit group 35. The heat transfer tube unit group 35 includes a plurality of heat transfer tube units 30.

(2) Configuration of Each Part (2-1) Header and Piping The first piping 41 and the second piping 42 are for passing a refrigerant. Both the first pipe 41 and the second pipe 42 can function as refrigerant inlets and outlets that can take various states such as gas, liquid, and gas-liquid two-phase. The first pipe 41 is connected to the first header 21 so as to exchange refrigerant with the first header 21. The second pipe 42 is connected to the second header 22 so as to exchange refrigerant with the second header 22. Both the first header 21 and the second header 22 have a heat transfer tube unit connection surface 23. The first header 21 and the second header 22 are arranged such that the heat transfer tube unit connection surfaces 23 face each other or substantially face each other.

(2-2) Heat Transfer Tube Unit Group The plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35 are arranged at intervals in the heat transfer tube unit arrangement direction x. Each heat transfer tube unit 30 is connected to the first header 21 and the second header at each heat transfer tube unit connection surface 23. The heat transfer tube unit 30 is integrally configured from, for example, aluminum or an aluminum alloy.

FIG. 2 shows one heat transfer tube unit 30. The heat transfer tube unit 30 includes a plurality of heat transfer tubes 31 and a plurality of fins 32. The number of heat transfer tubes 31 provided in the heat transfer tube unit 30 is, for example, six or more, but is not limited thereto.

The heat transfer tube 31 is for moving the refrigerant between the first header 21 and the second header 22. Both ends of each heat transfer tube 31 are connected to the heat transfer tube unit connection surfaces 23 of the first header 21 and the second header 22. Each heat transfer tube 31 has at least a portion extending in the heat transfer tube extension direction z, and is preferably linear. The plurality of heat transfer tubes 31 are generally arranged in the heat transfer tube separation direction y if the offset in the heat transfer tube unit arrangement direction x is ignored. The inner diameter of each heat transfer tube 31 is, for example, 1.5 mm or less, and preferably 0.8 mm or less.

The fins 32 are for exchanging heat between the refrigerant flowing through the adjacent heat transfer tubes 31 and the surrounding air. Each fin 32 is disposed between two adjacent heat transfer tubes 31. The fins 32 may be further disposed outside the outermost heat transfer tube 31 of the heat transfer tube unit 30. The fins 32 and the heat transfer tubes 31 are generally alternately arranged in the heat transfer tube separation direction y if the offset in the heat transfer tube unit arrangement direction x is ignored. The air is configured to flow in a direction parallel to the yz plane by a fan or the like (not shown). The direction of the air flow may coincide with the heat transfer tube separation direction y.

The heat transfer tube unit arrangement direction x, the heat transfer tube separation direction y, and the heat transfer tube extension direction z intersect each other. For example, the heat transfer tube unit arrangement direction x, the heat transfer tube separation direction y, and the heat transfer tube extension direction z are perpendicular to each other. The heat transfer tube unit arrangement direction x and the heat transfer tube separation direction y may be a horizontal direction, and the heat transfer tube extension direction z may be a vertical direction.

(3) Detailed Configuration of Heat Transfer Tube Unit 30 FIG. 3 is a schematic diagram of a heat transfer tube unit group 35A of the heat exchanger 10 according to the first embodiment of the present invention. Among the plurality of fins 32, a first inclined portion S1 that is inclined by a positive acute angle with respect to the heat transfer tube separation direction y, and a second inclination portion that is inclined by a negative acute angle with respect to the heat transfer tube separation direction y. There is an inclined portion S2. In the present embodiment, all the fins 32 are configured as planes. The absolute values of the positive acute angle and the negative acute angle are set to be substantially equal, for example.

The plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35A are all the first heat transfer tube units 30A. Here, the first heat transfer tube unit 30A is either a first fin 32A in which the plurality of fins 32 each have only the first inclined portion S1, or a second fin 32B that has only the second inclined portion S2. Say something.

In the first embodiment, the plurality of fins 32 included in the first heat transfer tube unit 30A are generally arranged alternately in the heat transfer tube separation direction y, and the first fins 32A and the first fins 32A and the heat transfer tube separation direction y are ignored. This is the second fin 32B.

(4) Features (4-1)
The airflow flowing along the heat transfer tube unit 30 meanders according to the change in the inclination of the fins 32. As a result, the probability that the airflow contacts the fins 32 increases. Therefore, the heat transfer performance of the heat exchanger 10 is improved.

(4-2)
In the first heat transfer tube unit 30A, the heat transfer tube 31 is located at the top of the meander, so that it is easy to confirm the shape in the manufacturing process, for example.

(4-3)
The inclinations of the fins 32 of the first heat transfer tube unit 30A are alternately reversed. Therefore, since a meandering shape with a small pitch can be formed, the contact frequency between the air flow and the fins 32 is increased, which contributes to improvement in heat transfer performance.

(5) Modifications Modifications of the present embodiment will be described below. A plurality of modifications may be combined.

(5-1) Modification 1A
FIG. 4 is a schematic diagram of a heat transfer tube unit group 35A ′ of the heat exchanger 10 according to Modification 1A of the first embodiment of the present invention. Unlike the heat transfer tube unit group 35 according to the first embodiment, in the first heat transfer tube unit 30A of the heat transfer tube unit group 35A ′ according to the modification 1A, all the fins 32 are configured as curved surfaces. Due to this curved surface, the first heat transfer tube unit 30A as a whole has, for example, a sine wave cross section.

(5-2) Modification 1B
FIG. 5 shows a heat exchanger 10 according to Modification 1B of the first embodiment of the present invention. In this heat exchanger 10, the first header 21 and the second header 22 are arranged on the same side with respect to the heat transfer tube unit group 35A ″. The first header 21 and the second header 22 are connected to a first pipe 41 and a second pipe 42, respectively.

FIG. 6 shows one of the plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35 A ″ of the heat exchanger 10. The heat transfer tube unit 30 includes a plurality of heat transfer tubes 31 and a plurality of fins 32. Each heat transfer tube 31 has at least a portion extending in the heat transfer tube extension direction z, and is preferably linear. The plurality of heat transfer tubes 31 are arranged in the heat transfer tube separation direction y. Furthermore, the adjacent heat transfer tubes 31 are connected by a curved connecting tube 31c. That is, the heat transfer tube unit 30 has one refrigerant path constituted by the heat transfer tube 31 and the connecting tube 31c. This refrigerant path moves the refrigerant between the first header 21 and the second header 22. The end of the heat transfer tube 31 is connected to any heat transfer tube unit connection surface 23 of the first header 21 and the second header 22.

The heat transfer tube unit 30 has fins 32 between adjacent heat transfer tubes 31. The fins 32 may be further disposed outside the outermost heat transfer tube 31 of the heat transfer tube unit 30. The plurality of fins 32 may be connected at the upper end or the lower end of the heat transfer tube unit 30. The fin 32 has a side extending in the heat transfer tube extension direction z, and is joined to the heat transfer tube 31 at that side. The fins 32 and the heat transfer tubes 31 are alternately arranged in the heat transfer tube separation direction y. The direction of the air flow is set at least in a direction parallel to the yz plane, preferably in a direction that coincides with the heat transfer tube separation direction y. The heat transfer tube unit 30 may be manufactured by a method other than extrusion molding of a metal material.

According to this configuration, since three of the four sides of the heat transfer tube unit 30 are open to the surrounding space, the dew condensation water is more easily discharged.

(5-3) Modification 1C
In the above-described embodiment, as an example of the arrangement, the configuration in which the heat transfer tube unit arrangement direction x and the heat transfer tube separation direction y are horizontal directions and the heat transfer tube extension direction z is vertical is mentioned. Instead of this, the heat exchanger 10 may be arranged in another direction. For example, the heat transfer tube separation direction y and the heat transfer tube extension direction z may be a horizontal direction, and the heat transfer tube unit arrangement direction x may be a vertical direction.

Second Embodiment
(1) Configuration FIG. 7 is a schematic diagram of a heat transfer tube unit group 35B of the heat exchanger 10 according to the second embodiment of the present invention.

Similarly to the heat transfer tube unit group 35A according to the first embodiment, the plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35B according to the second embodiment are all the first heat transfer tube units 30A. As described in the first embodiment, each of the plurality of fins 32 included in the first heat transfer tube unit 30A includes the first fin 32A having only the first inclined portion S1 and the second fin 32A having only the second inclined portion S2. One of the fins 32B. The plurality of fins 32 included in the first heat transfer tube unit 30A are generally alternately arranged in the heat transfer tube separation direction y if the offset in the heat transfer tube unit arrangement direction x is ignored.

However, unlike the heat transfer tube unit group 35A according to the first embodiment, in the heat transfer tube unit group 35B according to the second embodiment, the first fin 32A and the second fin 32B included in the first heat transfer tube unit 30A are two. The sheets are arranged alternately.

Also in this embodiment, all the fins 32 are configured as planes. Other elements not mentioned are the same as those in the first embodiment.

(2) Features Since the inclination of the fins 32 of the first heat transfer tube unit 30A is inverted every other one or more, a meandering shape with a large pitch is formed. As a result, the resistance of the air flow is reduced, and there are cases where the interval between the adjacent first heat transfer tube units 30A can be designed to be small according to the reduction. As a result, the heat transfer performance may be improved.

(3) Modifications (3-1) Number of alternately arranged fins The first fins 32A and the second fins 32B that are alternately arranged in the heat transfer tube separation direction y are not limited to two each. For example, the first fins 32A and the second fins 32B may be alternately arranged by three or more.

According to this configuration, the spatial length of the meander cycle of the heat transfer tube unit 30 can be increased. Therefore, the air flow is less susceptible to resistance.

(3-2) Others Modifications of the first embodiment may be applied to the second embodiment.

<Third Embodiment>
(1) Configuration FIG. 8 is a schematic diagram of a heat transfer tube unit group 35C of the heat exchanger 10 according to the third embodiment of the present invention. Similarly to the heat transfer tube unit group 35A according to the first embodiment, also in the heat transfer tube unit group 35C according to the third embodiment, the plurality of fins 32 have only a positive acute angle with respect to the heat transfer tube separation direction y. There are a first inclined portion S1 that is inclined and a second inclined portion S2 that is inclined by a negative acute angle with respect to the heat transfer tube separation direction y. Also in this embodiment, all the fins 32 are configured as a plane.

Unlike the heat transfer tube unit group 35A according to the first embodiment, the plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35C according to the third embodiment are all second heat transfer tube units 30B. Here, the second heat transfer tube unit 30 B refers to a unit in which the third fin 32 C having both the first inclined portion S 1 and the second inclined portion S 2 is included in the plurality of fins 32. In the present embodiment, the plurality of fins 32 included in the second heat transfer tube unit 30B are all the third fins 32C.

In the third embodiment, the plurality of fins 32 included in the second heat transfer tube unit 30B are generally arranged in the heat transfer tube separation direction y if the offset in the heat transfer tube unit arrangement direction x is ignored. The boundary between the first inclined portion S1 and the second inclined portion S2 in each fin 32 protrudes in either the positive direction or the negative direction of the heat transfer tube unit arrangement direction x. Generally, the plurality of fins 32 arranged in the heat transfer tube separation direction y are alternately different in the protruding direction.

Other elements not mentioned are the same as those in the first embodiment.

(2) Features (2-1)
The fins 32 of the second heat transfer tube unit 30B are all third fins 32C, and the protruding directions of the third fins 32C are alternately reversed. Therefore, since a meandering shape with a small pitch can be formed, the contact frequency between the air flow and the fins 32 is increased, which contributes to improvement in heat transfer performance.

(2-2)
The second heat transfer tube unit 30B occupies a small space because the heat transfer tube 31 is not located at the top of the meandering. Therefore, the resistance of the air flow can be reduced, which can improve the heat transfer performance.

(3) Modifications Modifications of the previous embodiments may be applied to the third embodiment.

<Fourth embodiment>
(1) Configuration FIG. 9 is a schematic diagram of a heat transfer tube unit group 35D of the heat exchanger 10 according to the fourth embodiment of the present invention.

Similarly to the heat transfer tube unit group 35C according to the third embodiment, the plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35D according to the fourth embodiment are all the second heat transfer tube units 30B. As described in the third embodiment, the second heat transfer tube unit 30B includes the third fin 32C having both the first inclined portion S1 and the second inclined portion S2 in the plurality of fins 32. Say. However, unlike the third embodiment, the plurality of fins 32 of the second heat transfer tube unit 30B employed in the fourth embodiment are not only the third fins 32C but also the first fins 32A described in the first embodiment. The second fin 32B is also included.

The plurality of fins 32 included in the second heat transfer tube unit 30B according to the fourth embodiment are generally alternately arranged in the heat transfer tube separation direction y if the offset in the heat transfer tube unit arrangement direction x is ignored. The plurality of fins 32 include a plurality of third fins 32C arranged so that the protruding directions are alternately different. Further, the first fins 32A and the second fins 32B are alternately arranged at a plurality of locations sandwiched between the adjacent third fins.

(2) Features According to this configuration, the inclination of the fins 32 of the second heat transfer tube unit 30B is inverted every other one or more. Therefore, since a meandering shape with a large pitch can be formed, the resistance of the air flow can be reduced, which may improve the heat transfer performance.

(3) Modifications (3-1) Number of alternately arranged fins The number of first fins 32A and second fins 32B alternately arranged at a plurality of locations sandwiched between adjacent third fins 32C is limited to one. I can't. For example, two or more first fins 32A and second fins 32B may be alternately arranged.

According to this configuration, the pitch of the meandering shape of the heat transfer tube unit 30 can be increased, so that the air flow is less susceptible to resistance. Therefore, the heat transfer performance may be improved as in the second embodiment.

(3-2) Others Modifications of the previous embodiments may be applied to the fourth embodiment.

<Fifth Embodiment>
(1) Configuration FIG. 10 is a schematic diagram of a heat transfer tube unit group 35E of the heat exchanger 10 according to the fifth embodiment of the present invention. Similarly to the heat transfer tube unit group 35A according to the first embodiment, also in the heat transfer tube unit group 35E according to the fifth embodiment, the plurality of fins 32 include only a positive acute angle with respect to the heat transfer tube separation direction y. There are a first inclined portion S1 that is inclined and a second inclined portion S2 that is inclined by a negative acute angle with respect to the heat transfer tube separation direction y. Also in this embodiment, all the fins 32 are configured as a plane.

The plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35E are the first heat transfer tube unit 30A used in the first embodiment and the second heat transfer tube unit 30B used in the third embodiment. Since the structure of the first heat transfer tube unit 30A and the second heat transfer tube unit 30B has already been described, description thereof is omitted here. In the heat transfer tube unit group 35E, the first heat transfer tube units 30A and the second heat transfer tube units 30B are alternately arranged in the heat transfer tube unit arrangement direction x. Thereby, from the viewpoint of facing the heat transfer tube unit arrangement direction x, the heat transfer tubes 31 belonging to the first heat transfer tube unit 30A are located between the adjacent heat transfer tubes 31 belonging to the second heat transfer tube unit 30B.

Other elements not mentioned are the same as those in the first embodiment.

(2) Features (2-1)
The heat exchanger 10 has two types of heat transfer tube units, that is, a first heat transfer tube unit 30A and a second heat transfer tube unit 30B. Therefore, by appropriately arranging the two types of heat transfer tube units, it is possible to improve the heat transfer performance while reducing the air resistance.

(2-2)
In locations where the first heat transfer tube unit 30A and the second heat transfer tube unit 30B are adjacent to each other, the heat transfer tubes 31 belonging to the respective heat transfer tube units are not close to each other. Therefore, air resistance due to the proximity of the heat transfer tube 31 hardly occurs at that location.

(2-3)
Since the first heat transfer tube units 30A and the second heat transfer tube units 30B are alternately arranged, there are few places where the heat transfer tubes 31 belonging to the adjacent heat transfer tube units are close to each other. Accordingly, air resistance due to the proximity of the heat transfer tube 31 is less likely to occur.

(3) Modified Examples (3-1) Types of Heat Transfer Tube Units The plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35E are not limited to the two types of the first heat transfer tube unit 30A and the second heat transfer tube unit 30B. There may be three or more types. For example, the heat transfer tube unit group 35E may be configured by preparing three types of heat transfer tube units in which the positions of the heat transfer tubes are shifted by 1/3 of the fin width and arranging them regularly.

According to this configuration, for example, when it is allowed to design a large fin width, it is difficult to increase the air resistance even if the interval between the heat transfer tube units in the heat transfer tube unit arrangement direction x is set short. Therefore, the heat transfer performance of the heat exchanger may be improved.

(3-2) Others Modifications of the previous embodiments may be applied to the fifth embodiment.

<Sixth Embodiment>
(1) Configuration FIG. 11 is a schematic diagram of a heat transfer tube unit group 35F of the heat exchanger 10 according to the sixth embodiment of the present invention. Similarly to the heat transfer tube unit group 35A according to the first embodiment, also in the heat transfer tube unit group 35F according to the sixth embodiment, the plurality of fins 32 have only a positive acute angle with respect to the heat transfer tube separation direction y. There are a first inclined portion S1 that is inclined, and a second inclined portion S2 that is inclined by a negative acute angle with respect to the heat transfer tube separation direction y. Also in this embodiment, all the fins 32 are configured as a plane.

The plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35F are the first heat transfer tube unit 30A used in the second embodiment and the second heat transfer tube unit 30B used in the fourth embodiment. Since the structure of the first heat transfer tube unit 30A and the second heat transfer tube unit 30B has already been described, description thereof is omitted here. In the heat transfer tube unit group 35F, the first heat transfer tube units 30A and the second heat transfer tube units 30B are alternately arranged in the heat transfer tube unit arrangement direction x. Thereby, from the viewpoint of facing the heat transfer tube unit arrangement direction x, the heat transfer tubes 31 belonging to the first heat transfer tube unit 30A are located between the adjacent heat transfer tubes 31 belonging to the second heat transfer tube unit 30B.

Other elements not mentioned are the same as those in the first embodiment.

(2) Features (2-1)
In locations where the first heat transfer tube unit 30A and the second heat transfer tube unit 30B are adjacent to each other, the heat transfer tubes 31 belonging to the respective heat transfer tube units are not close to each other. Therefore, air resistance due to the proximity of the heat transfer tube 31 hardly occurs at that location.

(2-2)
In both the first heat transfer tube unit 30A and the second heat transfer tube unit 30B, the inclination of the fins 32 is reversed every one or more. Therefore, since a meandering shape with a large pitch can be formed, the resistance to airflow can be reduced.

(3) Modified Examples (3-1) Types of Heat Transfer Tube Units Similar to the modified example of the fifth embodiment, the plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 35F include the first heat transfer tube unit 30A and the first heat transfer tube unit 30A. There may be not only two types of the two heat transfer tube units 30B but also three or more types.

This configuration may improve the heat transfer performance of the heat exchanger as described in the modification of the fifth embodiment.

(3-2) Number of Fins Alternatingly Arranged Regarding the first heat transfer tube unit 30A, the number of first fins 32A and second fins 32B that are alternately arranged in the heat transfer tube separation direction y is not limited to two. For example, three or more first fins 32A and second fins 32B may be alternately arranged.

Regarding the second heat transfer tube unit 30B, the number of the first fins 32A and the second fins 32B alternately arranged in a plurality of gaps defined by the adjacent third fins is not limited to one. For example, two or more first fins 32A and second fins 32B may be alternately arranged.

(3-3) Others Modifications of the previous embodiments may be applied to the sixth embodiment.

<Conclusion>
While the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the present disclosure.

For example, the configuration of the heat transfer tube unit described above may be applied to a flat tube for heat exchange. The flat tube for heat exchange is a member used for, for example, a microchannel heat exchanger. In this case, the flat tube for heat exchange has a meandering shape as shown in FIG. The flat tube for heat exchange has heat transfer tubes 31 and fins 32 that are alternately arranged in the heat transfer tube separation direction y.

DESCRIPTION OF SYMBOLS 10 Heat exchanger 21 1st header 22 2nd header 23 Heat transfer tube unit connection surface 30 Heat transfer tube unit 30A 1st heat transfer tube unit 30B 2nd heat transfer tube unit 31 Heat transfer tube 32 Fin 32A 1st fin 32B 2nd fin 32C 3rd Fin 41 First piping 42 Second piping S1 First inclined portion S2 Second inclined portion

JP 2006-1054889 A

Claims

A heat transfer tube unit (30) having a plurality of fins (32) and a plurality of heat transfer tubes (31),
With multiple
The plurality of heat transfer tube units are arranged at intervals in the heat transfer tube unit arrangement direction (x),
In each heat transfer tube unit,
The plurality of heat transfer tubes extend in a heat transfer tube extension direction (z) perpendicular to the heat transfer tube unit arrangement direction (x),
The fins and the heat transfer tubes are alternately arranged in the heat transfer tube separation direction (y) perpendicular to the heat transfer tube unit arrangement direction (x) and the heat transfer tube extension direction (z),
The plurality of fins of each heat transfer tube unit are respectively
A first inclined portion (S1) inclined by a positive acute angle with respect to the heat transfer tube separating direction (y), and
A second inclined portion (S2) inclined by a negative acute angle with respect to the heat transfer tube separating direction (y),
Including at least one of
Heat exchanger (10).
The plurality of heat transfer tube units have at least one of a first heat transfer tube unit (30A) and a second heat transfer tube unit (30B),
The plurality of fins of the first heat transfer tube unit (30A) are respectively
A first fin (32A) having only the first inclined portion (S1), and a second fin (32B) having only the second inclined portion (S2),
Either
The plurality of fins of the second heat transfer tube unit (30B)
A third fin (32C) having both the first inclined portion (S1) and the second inclined portion (S2);
including,
The heat exchanger according to claim 1.
The plurality of heat transfer tube units include both the first heat transfer tube unit (30A) and the second heat transfer tube unit (30B).
The heat exchanger according to claim 2.
From the viewpoint of facing the heat transfer tube unit arrangement direction (x), the heat transfer tubes belonging to the first heat transfer tube unit (30A) are positioned between the adjacent heat transfer tubes belonging to the second heat transfer tube unit (30B). To
The heat exchanger according to claim 3.
The first heat transfer tube units and the second heat transfer tube units are alternately arranged in the heat transfer tube unit arrangement direction (x).
The heat exchanger according to claim 3 or 4.
The plurality of fins of the first heat transfer tube unit are the first fins and the second fins alternately arranged in the heat transfer tube separation direction (y).
The heat exchanger according to any one of claims 2 to 5.
The plurality of fins of the first heat transfer tube unit are the first fins and the second fins that are alternately arranged two or more in the heat transfer tube separation direction (y).
The heat exchanger according to any one of claims 2 to 5.
The plurality of fins of the second heat transfer tube unit are the third fins arranged in the heat transfer tube separation direction (y) so that the protruding directions are alternately different.
The heat exchanger according to any one of claims 2 to 6.
The plurality of fins of the second heat transfer tube unit include all of the first fin, the second fin, and the third fin, and at least one of the first fins between two of the third fins. 1 fin or the second fin is arranged,
The heat exchanger according to any one of claims 2, 3, 4, 5, and 7.
The plurality of fins are curved surfaces.
The heat exchanger according to any one of claims 1 to 9.