JP2008215757A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent residence of condensed water by accelerating its flow-down at a heat transfer fin part of an air heat exchanger of an indoor unit or the like for an air conditioner. <P>SOLUTION: The heat exchanger comprises: heat transfer tubes 12; heat transfer fins A, B juxtaposed in large numbers in a state of crossing the heat transfer tubes 12; and cut-and-raised pieces 13 provided on heat transfer surfaces of the heat transfer fins A, B. The angles of both upper and lower ends of the cut-and-raised pieces 13 are set to inclination angles of 45° or less to allow the condensed water to easily flow down to thereby accelerate flow-down of the condensed water utilizing the steep inclined surfaces. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to the structure of a heat exchanger such as an indoor unit for an air conditioner.

  For example, as a heat exchanger for an air conditioner indoor unit, a cross fin coil type air heat exchanger is generally adopted, and the condensed water generated on the surface of the heat exchanger (evaporator) during cooling operation is caused by gravity. It flows down along the fin surface of the heat exchanger, is collected in a drain pan portion provided below the heat exchanger, and is discharged outside the room (see Patent Document 1).

  Now, the configuration of a conventional indoor unit for an air conditioner configured with such a heat exchanger is shown in FIGS. 4 and 5. FIG.

  In other words, in this conventional example, a so-called lambda-shaped air heat exchanger 32 bent in a λ shape from the upper side to the lower side and the cross flow fan 31 are used to suck the upper surface side and the front side, and to hang the slanted downward blow wall. The indoor unit 1 for type | mold air conditioners is comprised, and the code | symbol 20 is the cassette-type main body casing of the said indoor unit 1 for wall-mounted type air conditioners. The main body casing 20 is installed on the wall surface such that the back panel portion is in contact with the wall surface of the room.

  An air inlet 25 is provided from the front side to the upper side of the main body casing 20, and a lambda type air heat exchanger 32 and a cross flow fan 31 are provided inside the air inlet 25. The lambda type air heat exchanger 32 includes a front side heat exchange part 32a and a rear side heat exchange part 32b, and is provided with a cross flow fan 31 provided below the inside thereof. The cross-flow fan 31 blows temperature-controlled air obliquely downward from an air outlet 29 at the bottom on the front side of the main body casing 20 via a temperature-control air passage 30 having a scroll structure.

  The air heat exchanger 32 is supported by fixing the lower ends of the front-side heat exchanger 32a and the rear-side heat exchanger 32b in the drain pans 28a and 28b, respectively.

  For example, as shown in FIG. 5, the heat exchanger section of the air heat exchanger 32 is arranged in two rows from the upstream side to the downstream side of the air flow F in the front and rear, and the heat transfer tubes are arranged with their positions shifted alternately. .., 12, 12... And a large number of the heat transfer tubes 12, 12..., 12, 12. Heat transfer fins A, A ... (upstream side), B, B ... (downstream side) and each of the heat transfer fins A, A ..., B, B ... on the heat transfer surface. .., 13, 13, 13, etc., such as slits (or louvers) of a plurality of front and rear rows of slits (or louvers) provided in the upper and lower space region between the heat transfer tubes 12, 12. .. and heat transfer fins A, A..., B, B..., And tube plates (not shown) provided on both ends in the juxtaposed direction.

  The raised and raised pieces 13, 13,..., 13, 13,... Between the upper and lower heat transfer tubes 12, 12 are, for example, from the upstream side to the downstream side (from the left side to the right side in the figure) at the front and rear ends 13a, 13a. The middle ones 13b, 13b are composed of four short front and rear rows, and the upper and lower ends of each of them 13a, 13b, 13b, 13a are, for example, as shown in detail in FIG. The inclination angle θ is 46 ° to 90 °, and the arc shape corresponding to the tube shape of the upper and lower heat transfer tubes 12 and 12 is formed.

  Therefore, in the case of this configuration, for example, during cooling or heating operation, when the cross flow fan 31 that is a blowing means is driven, indoor air is sucked from the air suction port 25, and the heat exchange area has the λ shape. The temperature-controlled air (cold air or warm air), which is large and has a wide air suction area and is heat-exchanged uniformly and effectively with low-pressure loss via the air heat exchanger 32 as described above, A comfortable cooling or heating air-conditioning environment for the user is realized by blowing out from the outlet 29 and descending downward.

  In the air heat exchanger 32 applied to such a wall-hanging indoor unit for an air conditioner, the heat transfer fins A and A are used particularly in the cooling operation in which the heat exchanger 32 serves as an evaporator. ... moisture in the air condenses on the heat transfer surfaces of B, B ..., and a lot of condensation occurs on the heat transfer surfaces, and these cause the slits (or louvers) to be cut and raised. It adheres to the pieces 13, 13... 13, 13,.

  The condensed water generated on the surface of the heat exchanger during the cooling operation stays between the fins and remains even after the operation is stopped. And this water causes the attachment of environmental floating substances to the fin surface, the growth of bacteria, the corrosion of the fin, etc., and causes the deterioration of hydrophilicity and the generation of odor.

  Of course, in the case of the same configuration, the front and rear heat exchange portions 32a and 32b of the air heat exchanger 32 are, for example, as shown in FIG. It is installed at.

  Therefore, the condensed water is caused to flow downward along the fin surface as much as possible by gravity and collected in the drain pans 28a and 28b.

JP 2000-171186 A

  However, in reality, the heat exchanger itself is nearly vertical due to the narrow fin pitch of the heat transfer fins A, A..., B, B. Even if it is a case where it is installed in the standing state as shown in FIG. 4, it is the actual situation that the condensed water staying between the fins does not flow down for a long time.

  Further, depending on the type of indoor unit for an air conditioner, for example, as shown in FIG. 6, the main part 42a of the air heat exchanger 42 is installed with the windward side inclined downward from the vertical direction due to its structure. In such a case, in addition to the fact that the action of gravity is less likely to act in the fin vertical direction (longitudinal direction) and in the vertical direction of the fin, the direction of gravity and the direction of the wind are reversed. There is a problem that the behavior of the condensed water itself becomes unstable, leading to water splashing from the air outlet 49.

  In FIG. 6, 1 is an indoor unit for an air conditioner, 3 is a ceiling, 40 is a ventilation passage, 41 is a cross flow fan, 42 is a heat exchanger, 42 a is an inclined portion of a predetermined angle or more of the heat exchanger 42 ( Main part side), 42b is an upper end, 44 is a ceiling panel, 45 is an air inlet, 48a to 48c are first to third drain pans, 49 is an air outlet, and 50 is a main casing.

  These problems are that the slits 13a, 13a on both the front and rear ends of the cut and raised pieces 13, 13... Are divided into upper and lower divided slits (or louvers) 13a, The same applies to 13a, 13a, and 13a.

  The present invention has been made in order to solve such problems, and the angles of the upper and lower ends of the cut and raised pieces such as slits or louvers provided between the upper and lower heat transfer tubes are all 45 ° or less acute angles. It is an object of the present invention to provide a heat exchanger suitable for an indoor unit for an air conditioner that promotes the flow of water. .

  In order to achieve the above object, the present invention is configured with the following problem solving means.

(1) Invention of Claim 1 The heat exchanger of this invention is the heat exchanger tube 12,12 ..., 12,12 ... and this heat exchanger tube 12,12 ..., 12, 12, ... Heat transfer fins A, A..., B, B... And heat transfer fins A, A... B, B. A heat exchanger composed of cut and raised pieces 13, 13, ..., 13, 13 ... provided on the surface, the cut and raised pieces 13, 13, ..., 13, 13 ... The angle of the upper and lower end portions of each is characterized by an inclination angle of 45 ° or less at which the condensed water tends to flow down.

  According to such a configuration, the condensed water is between the heat transfer fins A, A..., B, B. It does not stay between the cut and raised pieces 13, 13,..., 13, 13... And smoothly flows downward from their upper and lower ends. Thereby, adhesion of environmental floating substances to the fin surface, bacterial growth, fin corrosion, and the like can be prevented.

  Further, since the water drainage during the cooling operation is also good, it is possible to improve the cooling capacity, reduce the ventilation resistance, and prevent water jumping.

(2) Invention of Claim 2 The heat exchanger of this invention is a structure of the invention of the said Claim 1, WHEREIN: The said cut-and-raised piece 13,13 ..., 13,13 ... is a slit. It is characterized by.

  According to such a configuration, the condensed water is between the heat transfer fins A, A..., B, B. .. Does not stay between the slits 13, 13... 13, 13..., And smoothly flows downward from their upper and lower ends. Thereby, adhesion of environmental floating substances to the fin surface, bacterial growth, fin corrosion, and the like can be prevented.

  Further, since the water drainage during the cooling operation is also good, it is possible to improve the cooling capacity, reduce the ventilation resistance, and prevent water jumping.

(3) Invention of Claim 3 In the heat exchanger of the present invention, in the configuration of the invention of Claim 1, the raised pieces 13, 13,..., 13, 13,. It is characterized by.

  According to such a configuration, the condensed water is between the heat transfer fins A, A..., B, B. It does not stay between the louvers 13, 13,..., 13, 13,... And smoothly flows downward from their upper and lower ends. Thereby, adhesion of environmental floating substances to the fin surface, bacterial growth, fin corrosion, and the like can be prevented.

  Further, since the water drainage during the cooling operation is also good, it is possible to improve the cooling capacity, reduce the ventilation resistance, and prevent water jumping.

(4) Invention of Claim 4 The heat exchanger of this invention is the structure of the invention of the said Claim 1, 2, or 3, The said heat exchanger is a heat exchanger of the indoor unit for air conditioners. It is a feature.

  According to the heat exchanger of the configuration of each of the above inventions, when the heat exchanger is a heat exchanger for an air conditioner indoor unit, the cut and raised pieces of each heat transfer fin when the cooling operation is performed Part of the condensed water is smoothly discharged to the lower drain pan.

  As a result of the above, according to the present invention, adhesion of environmental suspended matter to the fin surface, bacterial growth, fin corrosion, etc. do not occur, water drainage during cooling operation is good, cooling capacity is improved, and ventilation resistance is reduced Therefore, it is possible to provide a high-performance air heat exchanger suitable for an indoor unit for an air conditioner capable of preventing water splash and the like easily and at low cost.

(Best Embodiment 1)
1 and 2 show the configuration and operation of a heat exchanger suitable for an air conditioner indoor unit (see FIG. 4) according to the first embodiment of the present invention.

  That is, the air heat exchangers 32a (32b) of this embodiment have, for example, two rows in the direction from the upstream side to the downstream side of the air flow F, and the heat transfer tubes 12 and 12 that are alternately disposed at different positions. .., 12, 12... And a plurality of heat transfer fins arranged in parallel with each other while maintaining a predetermined pitch with respect to each of the heat transfer tubes 12, 12. A, A... (Upstream side), B, B... (Downstream side), and the heat transfer tubes 12 on the heat transfer surfaces of the heat transfer fins A, A. , 12..., 12, 12,..., 12, 12... It is comprised from the tube sheet which is not shown in figure provided in the both ends of fin A, A ..., B, B ....

  In this embodiment, the cut and raised pieces 13, 13,..., 13, 13,... Between the upper and lower heat transfer tubes 12, 12 are, for example, from the upstream side to the downstream side of the air flow F (the left side in the figure). From the right to the right), the front and rear ends 13a and 13a are long, and the middle ones 13b and 13b are short and have a front and rear four-row structure. The upper and lower ends of 13b and 13a are each formed into an acute angle shape with an inclination angle θ of 45 ° or less, as shown in detail in FIG. 2, for example, and are respectively transmitted through the fin surface to form the slits 13a and 13b. The condensed water flowing into the parts 13b and 13a flows in smoothly, and further, the condensed water that flows in flows smoothly downward and flows down to the lower drain pan side without staying in the slit part. It is like that.

  In the conventional configuration, for example, as is apparent from the configuration of FIG. 5, the inclination angles of the upper and lower ends of the slits 13a, 13a on the front and rear ends are at least larger than 45 ° (46 ° or more), 12 are formed in an arc shape corresponding to the shape of the tube surface, and the intermediate parts 13b and 13b are formed in a flat surface of approximately 90 °, and the inside of each of the slits 13a, 13b, 13b and 13a The condensed water that has flowed into the stagnation stays on the bottom side, and even if the operation of the indoor unit for air conditioning is stopped, there is a problem that it does not flow down for a long time.

  Moreover, since the upper end side of each of these slits 13a, 13b, 13b, 13a is a concave shape or a flat surface shape, condensed water from above is moored at those portions, and the heat transfer fins A, A,. Condensed water was likely to stay between the fin surfaces of B, B.

  However, according to the configuration of the present embodiment, the upper ends of the slits 13a, 13b, 13b, and 13a are all sharply inclined surfaces as shown in FIG. 2, and the condensation flows down the fin surface. Water flows smoothly downward by gravity without stopping at the upper end portion of each slit 13a, 13b, 13b, 13a, and smoothly flows to the lower fin surface through the similar steeply inclined surface at the lower end portion. It is done.

  Therefore, the slits 13a, 13a ..., 13b, 13b ..., 13b, 13b ..., 13a, as well as between the fin surfaces of the heat transfer fins A, A ..., B, B ... The condensed water does not stay in the portion 13a..., And it is possible to reliably prevent adhesion of environmental suspended matters to the fin surface, bacterial growth, corrosion of the fin, and the like.

  Further, since the water drainage during the cooling operation is also improved, it is possible to improve the cooling capacity itself, reduce the ventilation resistance, and prevent water jumping.

(Modification)
The cut and raised pieces 13, 13,... 13, 13,... In the above description and illustrated form are not limited to the slits 13a, 13b, 13b, 13a as described above, and may be louvers. Various forms, numbers, and numbers of rows can be employed.

(Best Mode 2)
Next, FIG. 3 shows a configuration of an air heat exchanger suitable for an air conditioner indoor unit according to the second embodiment of the present invention.

  In this embodiment, in the cross fin coil type air heat exchanger similar to the best embodiment 1, the upper and lower divided slits 13a, 13a, 13a similar to the conventional example of FIG. , 13a, the upper and lower ends of each of 13a, 13a, 13a, 13a are inclined at an inclination angle θ as shown in FIG. 3, for example, as in the configuration of the first embodiment. Is formed into an acute angle shape that is 45 ° or less, and the condensed water that has flowed into the slits 13a, 13a, 13b, 13b, 13a, 13a through each fin surface smoothly flows downward, It flows down quickly without staying in the water.

  Even in such a configuration, a smooth condensate discharging operation can be realized in exactly the same manner as in the case of the above-described first embodiment.

(Various application forms)
In addition, each heat exchanger of the said best embodiment 1 and 2 is an optimal thing as a cross fin coil type | mold air heat exchanger of the indoor unit for air conditioners of the structure like FIG. 4, FIG. 6 mentioned above, for example. No environmental floating substances adhere to the surface of the heat transfer fins, bacteria breed, fin corrosion, etc., water drainage during cooling operation is good, cooling capacity improvement, reduction of ventilation resistance, prevention of water jumping, etc. However, it is needless to say that the heat exchanger of the present invention can be applied to various other refrigeration apparatuses.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view showing a configuration of an air heat exchanger according to a first preferred embodiment of the present invention. It is a partially cutaway sectional view which expands the composition of the principal part of the air heat exchanger and shows the operation. It is a partially notched front view which shows the structure of the air heat exchanger which concerns on best Embodiment 2 of this invention. It is sectional drawing which shows the structure of the indoor unit for air conditioners comprised using the air heat exchanger which concerns on a 1st prior art example. It is a partially cutaway sectional view showing the composition of the principal part of the air heat exchanger. It is sectional drawing which shows the structure of the indoor unit for air conditioners comprised using the air heat exchanger which concerns on a 2nd prior art example. It is a partially cutaway sectional view showing a configuration of a main part of an air heat exchanger according to a third conventional example.

Explanation of symbols

  1 is an indoor unit for an air conditioner, 3 is a ceiling, 12 is a heat transfer tube, 13 is a cut and raised piece, 13a and 13b are slits (or louvers), 25 and 45 are air inlets, and 29 and 49 are air outlets , 28a, 28b, 48a to 48c are drain pans, 30, 40 are blower passages, and 32, 42 are heat exchangers.

Claims (4)

  The heat transfer tubes 12, 12..., 12, 12... And a plurality of heat transfer fins A arranged in parallel with the heat transfer tubes 12, 12. , A ..., B, B ... and the cut and raised pieces 13, 13 ... provided on the heat transfer surfaces of the heat transfer fins A, A ..., B, B ..., Is a heat exchanger composed of 13, 13..., 45 ° at which the condensed water easily flows down the angles of the upper and lower ends of the cut and raised pieces 13, 13,. A heat exchanger having the following inclination angle.   The heat exchanger according to claim 1, wherein the cut and raised pieces (13, 13, ..., 13, 13, ...) are slits.   2. The heat exchanger according to claim 1, wherein the cut and raised pieces 13, 13... 13, 13.   The heat exchanger according to claim 1, 2 or 3, wherein the heat exchanger is a heat exchanger of an indoor unit for an air conditioner.

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