JP6448948B2 - Heat exchanger and outdoor unit for air conditioner using the same - Google Patents

Description

  The present invention relates to a multi-flow type heat exchanger and an outdoor unit for an air conditioner using the same.

  As an outdoor heat exchanger of an air conditioner, a pair of headers provided at intervals, a plurality of flat heat exchange tubes arranged in parallel at a predetermined interval between the pair of headers, and a flat heat exchange tube A so-called multi-flow type heat exchanger is provided, which includes a fin disposed and circulates the refrigerant in parallel to a plurality of flat heat exchange tubes having a plurality of refrigerant passages. In such a multi-flow type heat exchanger, an arbitrary number of partition plates are provided in the header, the flat heat exchange tubes are divided into passes for each set number, and the refrigerant meanders with respect to the flat heat exchange tubes for each set number. Usually, it is distributed.

  On the other hand, in a multi-flow type heat exchanger using a flat heat exchange tube, during heating operation, condensation or frost is generated on the top surface of the horizontally disposed flat heat exchange tube, or fins are formed on the top surface. If the condensed water or frost melt flows down from the upper flat heat exchange tubes and fins, the upper surface is a flat horizontal surface, so there is a problem that the condensed water and melt water are difficult to drain. . Thus, the flat heat exchange tube is inclined so that the downstream side in the air flow direction is positioned downward, or as shown in Patent Document 1, the downstream end of the flat heat exchange tube in the air flow direction And / or an upstream end is provided with a downward inclined portion.

JP 2010-25478 A

  However, as described above, when the flat surface of the flat heat exchange tube is arranged obliquely with respect to the air flow, there is a problem that the ventilation resistance of the heat exchanger as a whole increases and the heat exchange efficiency decreases. Moreover, in what is shown to patent document 1, although there is no such problem, in the frosting period when condensed water freezes, since flat heat exchange tube itself also forms frost, the drainage property by an inclined part will deteriorate with frost. . Furthermore, at the time of defrost operation for melting the frost, the superheated gas flowing in from the upper part of the heat exchanger is cooled and liquefied by melting the frost and flows out from the lower part, but an inclined part is provided. When the flat heat exchange tube is disposed in the lower part, frost remains on the inclined part until the end of the defrost, and it is easy for defrosting to occur.

  On the other hand, in order to defrost the frost in a short time, it is desirable to remove the frost by sliding it as a lump rather than draining it in a state where the frost is completely melted. It is better to place the exchange tube below to some extent, but if the drainage performance at the inclined part decreases, the frost that has slipped will accumulate at the inclined part, so it is necessary to thaw the frost completely during defrosting. Therefore, the defrost time becomes longer and the comfort in the room is impaired.

  The present invention has been made in view of such circumstances, and has the dewatering property and the defrosting property at the time of frost formation in a multiflow type heat exchanger in which flat heat exchange tubes are arranged in a horizontal direction. An object is to provide an improved heat exchanger and an outdoor unit for an air conditioner using the heat exchanger.

In order to solve the above-described problems, the heat exchanger of the present invention and the outdoor unit for an air conditioner using the heat exchanger employ the following means.
That is, the heat exchanger according to the present invention includes a pair of headers provided at intervals, a plurality of flat heat exchange tubes arranged in parallel at a predetermined interval between the headers, and the flat heat exchange tubes. And at least one flat heat exchange tube disposed at an appropriate position in the flat heat exchange tube is replaced by a guide member made of a non-heat transfer material, and at least air of the guide member A downward inclined guide portion is provided at an upstream end portion in the flow direction.

  According to the present invention, at least one flat heat exchange tube disposed at an appropriate position in the flat heat exchange tube is replaced by a guide member made of a non-heat transfer material, and at least the air flow direction of the guide member is A flat heat exchange tube is installed at the middle position in the vertical direction of the heat exchanger where frost that has slipped down from the top is likely to accumulate during defrosting because it is configured to have a downwardly inclined guide part at the upstream end. Instead, a guide member made of a non-heat transfer material that does not flow refrigerant and keeps the surface temperature higher than that of the flat heat exchange tube is installed to suppress dew condensation and frost formation on the surface. In addition, the frost that has fallen down from the top during defrosting can be prevented from adhering to and accumulated on the inclined guide portion, and the frost can be removed smoothly. Therefore, it is possible to prevent condensation water and frost melting water from staying and improve heat exchange performance, improve defrost performance during frost formation, and ensure air-conditioning comfort. In addition, you may provide a downward inclination guide part also in the downstream end part of the air flow direction of a guide member.

  Furthermore, the heat exchanger of the present invention is the above heat exchanger, wherein the downward inclined guide portion provided at the end of the guide member has a downward inclined cut surface, a downward curved cut surface, and an outwardly convex shape. It is characterized by any one of a triangular surface, an outwardly convex circular arc surface, or an outwardly convex curved surface.

  According to the present invention, the downward inclined guide portion provided at the end of the guide member includes a downward inclined cut surface, a downward curved cut surface, an outwardly convex triangular surface, and an outwardly convex circular arc surface. Or since it is either one of the convex curved surfaces on the outside, the flow of air flowing through the heat exchanger can be made smooth, and the ventilation resistance in the heat exchanger can be reduced. Therefore, the air-side ventilation resistance can be suppressed and the heat exchange performance can be improved.

  The heat exchanger according to the present invention is characterized in that, in any of the heat exchangers described above, the guide member is made of an elastically deformable resin material.

  According to the present invention, since the guide member is made of an elastically deformable resin material, when a heat exchanger having a large width is bent into, for example, an L-shape or a U-shape, it is generally bent sesame. Is used to bend the heat exchanger. At this time, the inclined guide part at the end of the guide member may be deformed by the pressing of the bending sesame, but the guide member is made of an elastically deformable resin material to suppress the deformation of the inclined guide part due to bending. can do. Therefore, even if the heat exchanger is bent, deformation of the inclined guide portion provided in the guide member can be prevented, and the function can be reliably maintained.

  Furthermore, the heat exchanger according to the present invention is characterized in that, in any of the heat exchangers described above, both end portions of the guide member are fitted around the pair of headers.

  According to the present invention, since both ends of the guide member are fitted around the pair of headers, the condensed water, the frost melting water, or the frost sliding down from above does not fall directly below, and the heat exchanger Even if it falls to the side of the pair of headers arranged at both ends, the guide member fitted around the header can prevent it from adhering to the header and quickly fall down. . Therefore, it is possible to prevent the condensed water and frost melting water from adhering to the header or the accumulation of frost.

Furthermore, the heat exchanger according to the present invention includes a pair of headers provided at intervals, a plurality of flat heat exchange tubes arranged in parallel at a predetermined interval between the headers, and the flat heat exchange tubes. A non-heat transfer material having a plurality of heat exchangers provided on the top and bottom, and having a downwardly inclined guide portion at least at the upstream end in the air flow direction between the plurality of heat exchangers. A guide member made of metal is provided , and the plurality of upper and lower heat exchangers are provided with a certain gap, and the guide member is provided so as to shield the gap .

According to the present invention, a plurality of heat exchangers each having a flat heat exchange tube are arranged vertically, and a downwardly inclined guide portion is provided at least at the upstream end in the air flow direction between the plurality of upper and lower heat exchangers. Since the guide member made of non-heat transfer material is provided, the refrigerant does not flow between the heat exchangers arranged above and below, and the surface temperature is maintained higher than that of the flat heat exchange tube By arranging a guide member made of a non-heat transfer material, it is possible to maintain good drainage by suppressing condensation and frost formation on the surface, and an upper heat exchanger during defrosting It is possible to prevent the frost that has slipped down from adhering and accumulating on the inclined guide part and the heat exchanger on the lower side, and to smoothly remove the frost. Therefore, it is possible to prevent condensation water and frost melting water from staying and improve heat exchange performance, improve defrost performance during frost formation, and ensure air-conditioning comfort. When three or more heat exchangers are provided in the vertical direction, the guide member may be provided between all the heat exchangers, or may be provided only between any of the heat exchangers. . Further, according to the present invention, the plurality of upper and lower heat exchangers are provided with a certain gap, and the guide member is provided so as to shield the gap. When the heat exchanger is provided with a certain gap, by providing a guide member in the gap, the effective heat transfer area of each heat exchanger can be prevented from being affected, and the gap is shielded from wind. By preventing the air flow from being bypassed, the entire surface of the heat exchanger can function effectively. Therefore, the defrost performance at the time of frost formation can be improved by the guide member, the comfort of the air conditioning can be ensured, and the performance of the heat exchanger can be sufficiently exhibited.

  Furthermore, the outdoor unit for an air conditioner according to the present invention is an outdoor unit for an air conditioner in which an outdoor heat exchanger is provided together with an outdoor fan in the unit main body. It is characterized by being a heat exchanger.

  According to the present invention, since the outdoor heat exchanger is any one of the above-described heat exchangers, during the heating operation, condensation water or frost melting water stays in the outdoor heat exchanger that functions as an evaporator. Can be prevented, heat exchange performance can be improved, defrost performance can be improved, and defrosting during frost formation can be performed smoothly. Therefore, it is possible to improve the performance of the outdoor heat exchanger and improve the air conditioning capability, shorten the defrost time, and improve the comfort of the air conditioning.

  According to the heat exchanger of the present invention, at the time of defrosting, the refrigerant does not flow in place of the flat heat exchange tube at the middle position in the vertical direction of the heat exchanger where frost that has slipped down from above tends to accumulate, and the surface temperature is flat heat. By disposing a guide member made of a non-heat transfer material that is kept at a higher temperature than the replacement tube, it is possible to suppress dew condensation and frost formation on the surface and maintain good drainage, and to defrost The frost that has sometimes slipped down from the top can be prevented from adhering and accumulating on the inclined guide part, and the frost can be removed smoothly. In addition to being able to improve, the defrost performance at the time of frost formation can be improved and the comfort of air conditioning can be ensured.

  In addition, according to the heat exchanger of the present invention, a guide made of a non-heat transfer material in which the refrigerant does not flow between the plurality of heat exchangers arranged above and below and the surface temperature is maintained at a higher temperature than the flat heat exchange tube. By arranging the members, it is possible to maintain the drainage well by suppressing the condensation and frost formation on the surface, and the frost sliding down from the upper heat exchanger at the time of defrosting is inclined guide part Can prevent the frost from adhering to and deposit on the heat exchanger on the lower side and smoothly remove frost, thereby preventing the accumulation of condensed water and molten water of frost and improving the heat exchange performance It is possible to improve the defrosting performance during frosting and to ensure the comfort of air conditioning.

  Furthermore, according to the outdoor unit for an air conditioner of the present invention, it is possible to prevent condensation water and frost melting water from staying in the outdoor heat exchanger functioning as an evaporator during heating operation, and to improve heat exchange performance. At the same time, defrosting performance can be improved and defrosting can be performed smoothly during frosting. Therefore, the outdoor heat exchanger can be improved in performance and air conditioning capacity can be improved, and the defrost time can be shortened. Comfort can be improved.

It is a front view of the heat exchanger which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view including the arrangement | positioning part of the guide member of the said heat exchanger. It is sectional drawing of the modification (A) thru | or (D) of the said guide member. It is a block diagram (A) thru | or (D) of the heat exchanger which concerns on 2nd Embodiment of this invention, and a guide member applied to it. It is a perspective view of the header part of the heat exchanger which concerns on 3rd Embodiment of this invention. It is the fragmentary perspective view (A) of the heat exchanger which concerns on 4th Embodiment of this invention, and its side view (B). It is the partial front view (A) of the heat exchanger which concerns on 5th Embodiment of this invention, and its side view (B).

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a front view of a heat exchanger according to the first embodiment of the present invention, FIG. 2 is a partial sectional view including a portion where the guide member is disposed, and FIG. Cross-sectional views of A) to (D) are shown.
In the present embodiment, two heat exchangers 1 and 2 are shown as upper and lower heat exchangers 1 and 2 arranged vertically.

The two heat exchangers 1 and 2 have the same configuration and are modularized. Depending on the capacity of the heat exchanger, the two heat exchangers 1 and 2 are arranged as a single unit, or two or more units are arranged vertically. It is used. Hereinafter, the specific configuration of one heat exchanger 1 will be described.
The heat exchanger 1 includes a pair of headers 3 and 4 disposed in parallel at a predetermined interval, and a plurality of flat heat exchange tubes 5 disposed in parallel between the pair of headers 3 and 4. The so-called multiflow type heat exchanger 1 is constituted by corrugated fins 6 provided between a plurality of flat heat exchange tubes 5.

  The headers 3 and 4 may be obtained by cutting a pipe having a predetermined diameter into a predetermined length and closing both ends with lid members, or a pair of members formed in various cross-sectional shapes face each other. However, the configuration is not particularly limited, and headers of various configurations can be applied. A number of slit holes (not shown) for inserting the end portions of the flat heat exchange tubes 5 are formed in the opposing surfaces of the pair of headers 3 and 4 at predetermined intervals in the vertical direction.

  The flat heat exchange tube 5 is configured by a flat extruded tube having a predetermined width dimension and thickness dimension, and a plurality of small refrigerant passages 5A (see FIG. 2) are provided inside. The refrigerant passage 5A is configured by a circular hole, a polygonal hole, a hole provided with minute protrusions (fins) on the inner peripheral surface, and the like.

  In this embodiment, the fins 6 are corrugated fins formed by bending a thin plate into a corrugated shape, but are not necessarily limited to corrugated fins, and other fins such as plate fins are used. Of course it is good. Moreover, the fin 6 is good also as what provided heat transfer promotion means, such as many louvers, slits, and unevenness | corrugations, on the surface.

  The headers 3 and 4, the flat heat exchange tubes 5 and the fins 6 are all made of an aluminum alloy material, and appropriate members therein are clad materials clad with a brazing material. Insert the ends of a plurality of flat heat exchange tubes 5 into the slit holes provided in the pair of headers 3 and 4 using a jig, arrange fins 6 between the flat heat exchange tubes 5, and After the side plates 7 are inserted into the slit holes on the outer sides of the fins 6 on both sides and temporarily assembled, these members are brazed in the furnace and joined to form an integrated heat exchanger. Such an all-aluminum alloy heat exchanger and its manufacturing method are well known.

  In addition, any one of the headers 3 and 4 is provided with a refrigerant inlet pipe and an outlet pipe (not shown), and a partition plate is provided in the headers 3 and 4 at appropriate positions in the vertical direction. The refrigerant may meander through as many times as necessary. That is, in this heat exchanger 1, not only the refrigerant flowing into one header 3 is distributed to all flat heat exchange tubes 5 and distributed in parallel, but merged and flows out on the other header 4 side, The refrigerant can be circulated as follows.

  For example, a partition plate is provided at an appropriate position in the header 3, the refrigerant flowing from the refrigerant inlet pipe is distributed to the number of flat heat exchange tubes 5 partitioned by the partition plate, and flows in parallel, and the U 4 is placed on the other header 4 side. Turn and let the refrigerant flow through the remaining flat heat exchange tube 5 to join and flow out on the header 3 side, or provide partition plates at two locations on the top and bottom of the header 3 and one place in the header 4 A partition plate is provided, and the refrigerant flowing into the header 3 side is circulated by making U-turns twice on the header 4 side and the header 3 side in total, merging and flowing out on the header 4 side, etc. Can be distributed.

In this embodiment, the heat exchanger 1 having such a configuration is disposed in an outdoor unit of an air conditioner together with an outdoor blower, and the condensed water and the frost-melted water when functioning as an evaporator during heating operation. The following configuration is adopted as a countermeasure against drainage or defrost during frost formation.
FIG. 2 is a cross-sectional equivalent view of the intermediate position in the up-down direction of the heat exchanger 1, and the refrigerant is not flowed in place of at least one of the flat heat exchange tubes 5 arranged in parallel at a predetermined interval. The guide member 8 made of a non-heat transfer material having a flat cross-sectional shape is provided. The guide member 8 is preferably made of a light material having a lower heat transfer rate than the flat heat exchange tubes 5 and fins 6 made of an aluminum alloy material in order to suppress dew condensation and frost formation to ensure drainage. It is made of resin material.

  The guide member 8 has an upper surface and a lower surface that are flat surfaces. At least at the upstream end in the air flow direction A, the guide member 8 is a downwardly inclined guide so as to prevent the accumulation of frost that slides down as a lump B from above. The portion 9A is integrally formed. 9 A of this inclination guide part protrudes in the upstream of the air flow direction A with respect to the width direction dimension (width direction dimension of the flat heat exchange tube 5 and the fin 6) of the heat exchanger 1, The end surface faces downward. The inclined cut surface 10 is configured. For the guide member 8, as shown in FIG. 2, a downwardly inclined guide portion 9B may be integrally formed at the downstream end portion in the air flow direction A.

  As described above, the downward inclined guide portions 9A and 9B are provided at the upstream and downstream ends of the guide member 8 in order to ensure drainage and prevent frost accumulation. The guide portions 9A, 9B are not limited to the downward inclined cut surface 10 as shown in FIG. 2, but as shown in FIGS. 3A to 3D, the outwardly convex triangular surface 11, It may be configured by an outwardly convex arcuate surface 12, an outwardly convex curved surface 13 or a downward curved cut surface 14 and the like, and smoothly flowing the air flow A flowing through the heat exchanger 1 to reduce the ventilation resistance. The configuration can be reduced.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
In the heat exchanger 1, the refrigerant flowing from one header 3, 4 flows through the refrigerant passage 5 </ b> A of the plurality of flat heat exchange tubes 5 in the direction of arrow A by an outdoor fan or the like. And heat exchange through the fins 6. The heat exchanged with the air flow A causes the evaporated or condensed refrigerant to flow out of one of the headers 3 and 4.

  When this heat exchanger 1 is used as an evaporator during heating operation, the air flow A is cooled by evaporation of the refrigerant, so that moisture in the air is condensed on the surfaces of the flat heat exchange tubes 5 and the fins 6. In the frosting period, it freezes and frost is generated. These condensed water and frost-melted water flow down the surface of the flat heat exchange tubes 5 and the fins 6 sequentially and are drained to a drain pan below the heat exchanger 1. Here, since the guide member 8 installed so as to replace the single flat heat exchange tube 5 is made of a non-heat transfer material having a low heat transfer coefficient, for example, a resin material, It is kept at a higher temperature than the exchange tube 5, and condensation and frost formation on the surface can be suppressed to maintain good drainage.

  On the other hand, when frost formation is detected in the heat exchanger 1 during the frost formation period, the defrost operation is started, and the superheated gas discharged from the compressor is introduced into the heat exchanger 1. This superheated gas heats and melts frost adhering to the surfaces of the fins 6 and the like while flowing through the refrigerant passage 5A of the flat heat exchange tube 5 and drops it downward. In general, frost is often generated at a portion close to the upstream end surface in the air flow direction A of the heat exchanger 1, and rather than completely melting and draining the frost, as shown in FIG. It is preferable to slide and remove in the state of lump B in order to defrost in a short time.

  In the present embodiment, at the time of defrosting, a guide member 8 is provided so that the frost mass B that slides down from above does not adhere to the fins 6 and the like and accumulate on the way, and the air flow direction of the guide member 8 Since the downward inclined guide portions 9A and 9B are provided at the upstream and / or downstream end portions of the frost, the frost mass B sliding down from above is inclined to the inclined guide portion 9A as shown in FIG. , 9B so as to be separated from the heat exchanger 1 and not to be deposited on the inclined cut surfaces 10 of the inclined guide portions 9A, 9B.

  Thus, according to the present embodiment, at the time of defrosting, the surface temperature does not flow through the refrigerant in place of the flat heat exchange tube 5 at the intermediate position in the vertical direction of the heat exchanger 1 where frost that has slipped down from above tends to accumulate. However, since the guide member 8 made of a non-heat-transfer material that is kept at a higher temperature than the flat heat exchange tube 5 is disposed, it is possible to maintain good drainage by suppressing condensation and frost formation on the surface. In addition, it is possible to prevent the frost mass B sliding down from above during defrosting from adhering to the inclined guide portions 9A and 9B and accumulating, and to smoothly remove the frost. Therefore, it is possible to prevent condensation water and frost melting water from staying and improve heat exchange performance, improve defrost performance during frost formation, and ensure air-conditioning comfort.

  In addition, downward inclined guide portions 9A and 9B provided at the end of the guide member 8 are downwardly inclined cut surfaces 10, outwardly convex triangular surfaces 11, outwardly convex arcuate surfaces 12, and outwardly convex. The curved curved surface 13 or the downward curved cut surface 14 is used. For this reason, the flow of the air flow A flowing through the heat exchanger 1 can be made smooth, and the ventilation resistance in the heat exchanger 1 can be reduced. Therefore, the ventilation resistance on the air side is suppressed and the heat exchange performance is improved. can do.

  Furthermore, since the outdoor heat exchanger applied to the outdoor unit of the air conditioner is the heat exchanger 1, melting of condensed water and frost in the outdoor heat exchanger that functions as an evaporator during heating operation Water retention can be prevented, heat exchange performance can be improved, defrost performance can be improved, and defrosting during frost formation can be performed smoothly. Therefore, it is possible to improve the performance of the outdoor heat exchanger and improve the air conditioning capability, shorten the defrost time, and improve the comfort of the air conditioning.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
This embodiment differs from the first embodiment described above in that the heat exchanger 1 is bent. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In this embodiment, as shown in FIG. 4 (A), a heat exchanger 1 made in a planar shape as in the first embodiment is replaced with an L-shape or In this case, the planar heat exchanger 1 is generally bent using bending sesame.

  As described above, when bending is performed by pressing the bending sesame to the heat exchanger 1, the downward inclined guide portions 9A and 9B provided at the end portions of the guide member 8 are crushed as shown in FIG. As a result, the drainage function of the guide member 8 and the function of removing the frost mass B may be impaired. Therefore, in this embodiment, the guide member is a guide member 8A made of a resin material that can be elastically deformed.

  Thus, by making the guide member 8A made of an elastically deformable resin material, it is possible to suppress the deformation of the inclined guide portions 9A and 9B when bending is performed using bending sesame. For this reason, when a heat exchanger having a large width is bent into, for example, an L shape or a U shape, even if the heat exchanger 1 is bent using bending sesame, the heat exchanger 1 is provided on the guide member 8A. It is possible to prevent the inclined guide portions 9A and 9B from being deformed and maintain their functions reliably.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
The present embodiment is different from the first and second embodiments described above in that both end portions of the guide member 8B are externally fitted around the headers 3 and 4. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In the present embodiment, as shown in FIG. 5, both end portions of the guide member 8B are extended, the both end portions are externally fitted to the outer circumferences of the headers 3 and 4, and the downward inclined guides around the headers 3 and 4 are also provided. The portion 9C is provided.

  In this way, both ends of the guide member 8B are extended so as to be fitted on the outer circumferences of the headers 3 and 4, and the downward inclined guide portions 9C are provided around the headers 3 and 4, thereby melting condensed water and frost. Even if water or frost sliding down from above does not fall directly below and falls to the pair of headers 3 and 4 disposed at both ends of the heat exchanger 1, By the inclined guide portion 9C of the fitted guide member 8B, adhesion to the headers 3 and 4 can be prevented and it can be quickly dropped downward. Therefore, it is possible to prevent the condensed water or frost melting water from adhering to the headers 3 and 4 or frost accumulation.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
The present embodiment is different from the first embodiment in that the present embodiment is applied to a configuration in which two heat exchangers 1 and 2 are arranged up and down. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In this embodiment, as shown in FIGS. 6A and 6B, two heat exchangers 1 and 2 are arranged vertically as an upper heat exchanger 1 and a lower heat exchanger 2, A guide member 8C made of a non-heat transfer material is provided between the heat exchangers 1 and 2.

  That is, when a plurality of upper heat exchangers 1 and lower heat exchangers 2 are arranged above and below, a minute gap is formed between the heat exchangers 1 and 2, so that the upper heat exchanger 1 is positioned at the lowest position. A guide member 8C is provided, and the downward inclined guide portion 9D provided at the upstream end of the guide member 8C is shaped so as to cover the upstream side of the minute gap, so that the guide member 8C is drained by dew condensation water or frost-melted water or above. In addition to the configuration that can be used to prevent the accumulation of frost that slides down, the configuration that can prevent the bypass of the airflow A can be achieved.

  In this case, the guide member 8C may have a configuration in which the side plates 7 provided on both sides of the upper heat exchanger 1 are combined, or a configuration in which a dedicated guide member 8C is provided separately from the side plate 7. Also good.

  In this way, a plurality of upper heat exchangers 1 and lower heat exchangers 2 are provided above and below, and a downwardly inclined guide is provided between the upper and lower heat exchangers 1 and 2 at the upstream end in the air flow direction A. By having a portion 9D having a guide member 8C made of a non-heat transfer material in which the refrigerant does not flow and the surface temperature is maintained higher than that of the flat heat exchange tube 5, dew condensation and adhesion to the surface can be achieved. The frost can be kept well by suppressing the frost, and the frost that has slipped down from the upper heat exchanger 1 during defrosting adheres to and accumulates on the inclined guide portion 9D and the lower heat exchanger 2. Can be prevented and frost can be removed smoothly.

  As a result, it is possible to prevent retention of condensed water or frost-melted water, improve heat exchange performance, improve defrost performance during frost formation, and ensure air-conditioning comfort. When three or more heat exchangers are provided in the vertical direction, the guide member 8C may be provided between all the heat exchangers, or may be provided only between any of the heat exchangers. . In addition, since the downward inclined guide portion 9D has a shape that covers the upstream side of the minute gap between the upper and lower heat exchangers 1 and 2, bypass of the air flow A from the gap can be prevented. Exchange performance can be improved.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
Compared to the fourth embodiment described above, the present embodiment is applied to a structure in which a predetermined gap L is provided between the core portions of the two heat exchangers 1 and 2 disposed above and below. Different. Since other points are the same as those in the fourth embodiment, description thereof will be omitted.
In the present embodiment, a gap L is provided between the upper and lower two upper and lower heat exchangers 1 and 2, and the gap L is made of a non-heat transfer material that also serves as a wind shielding member. The guide member 8D is provided.

  In other words, the guide member 8D of the present embodiment includes a coupling portion with respect to the outer periphery of the mating portion of the headers 3 and 4 at both ends, and is inclined downward at an upstream end portion of the guide member 8D having a width corresponding to the gap L The guide portion 9E is configured to shield the gap L, and the inclined guide portion 9E suppresses condensation and frost formation on the surface to ensure drainage, and the upper side heat exchanger during defrosting 1 is configured to prevent the frost sliding down from 1 from adhering to the inclined guide portion 9E and the lower heat exchanger 2 and accumulating.

  In this way, when the upper and lower heat exchangers 1 and 2 are provided with a certain gap L, by providing the guide member 8D so as to shield the gap L, each of the heat exchangers 1 and 2 is provided. The effective heat transfer area can be prevented from being affected, and the gap L is shielded to prevent airflow bypass, so that the entire surfaces of the heat exchangers 1 and 2 can function effectively. For this reason, the defrost performance at the time of frost formation can be improved by the guide member 8D, the comfort of the air conditioning can be ensured, and the performance of the upper and lower heat exchangers 1 and 2 can be sufficiently exhibited.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the first to third embodiments described above, an example in which the downward inclined guide portions 9A and 9B are provided at the upstream and downstream ends of the air flow direction A of the guide members 8, 8A and 8B, respectively. As described above, in the present invention, the downward inclined guide portion may be provided at least at the upstream end portion of the guide members 8, 8A, 8B, and as shown in the fourth and fifth embodiments, the downstream side is provided. You may abbreviate | omit the downward inclination guide part of an edge part.

  However, in the fourth and fifth embodiments, the guide members 8C and 8D provided between the upper and lower heat exchangers 1 and 2 and the inclined guide portions 9D and 9E provided downward at the ends thereof are arranged in the air flow direction A. Although the example provided only on the upstream side has been described, it is a matter of course that a downward inclined guide portion may be provided with respect to the downstream end portion as in the first to third embodiments. Further, when a plurality of heat exchangers 1 and 2 are arranged up and down, they may be connected and arranged in series so that the refrigerant flows in series with the refrigeration cycle, or in parallel. They may be connected to each other in series.

1 Heat exchanger (upper heat exchanger)
2 Heat exchanger (lower heat exchanger)
3, 4 Header 5 Flat heat exchange tube 6 Fins 8, 8A, 8B, 8C, 8D Guide members 9A, 9B, 9C, 9D, 9E Inclined guide portion 10 Inclined cut surface 11 Triangular surface 12 Arc surface 13 Curved surface 14 Curved Cut surface A Air flow direction L Clearance

Claims (6)

A pair of headers provided at intervals, and
A flat heat exchange tube disposed in parallel at a predetermined interval between the headers;
A fin provided between the flat heat exchange tubes,
At least one flat heat exchange tube disposed at an appropriate position in the flat heat exchange tube is replaced by a guide member made of a non-heat transfer material,
A heat exchanger characterized in that a downwardly inclined guide portion is provided at least at an upstream end portion in the air flow direction of the guide member.   The downward inclined guide portion provided at the end of the guide member includes a downward inclined cut surface, a downward curved cut surface, an outwardly convex triangular surface, an outwardly convex arc surface, or an outwardly convex shape. The heat exchanger according to claim 1, wherein the heat exchanger is any one of curved surfaces.   The heat exchanger according to claim 1 or 2, wherein the guide member is made of an elastically deformable resin material.   The heat exchanger according to any one of claims 1 to 3, wherein both ends of the guide member are fitted around the pair of headers. A pair of headers provided at intervals, and
A flat heat exchange tube disposed in parallel at a predetermined interval between the headers;
A plurality of heat exchangers provided with upper and lower fins provided between the flat heat exchange tubes,
Between the plurality of upper and lower heat exchangers, a guide member made of a non-heat transfer material having a downward inclined guide portion at least at an upstream end in the air circulation direction is provided ,
The plurality of upper and lower heat exchangers are provided with a certain gap, and the guide member is provided so as to shield the gap . In the outdoor unit for an air conditioner in which an outdoor heat exchanger is provided together with an outdoor fan in the unit body,
The outdoor unit for an air conditioner, wherein the outdoor heat exchanger is the heat exchanger according to any one of claims 1 to 5 .

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