JP2007046869A - Evaporator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an evaporator capable of preventing degradation of cooling performance over a long time. <P>SOLUTION: This evaporator 1 is provided with: a plurality of fin groups 3 each comprising a plurality of plate fins 2 made of aluminum and arranged at intervals in the ventilation direction; a first heat exchange tube 4 comprising a plurality of straight tube parts 5 fixed to the plate fins 2 of the respective fin groups 3 in a piercing form and bent tube parts 6 and 7 each connecting two of the straight tube parts 5 adjacent to each other; and a second heat exchange tube 8 comprising a plurality of straight tube parts 9 and bent tube parts 11 and 12 each connecting two of the straight tube parts 9 adjacent to each other and connected to one end of the first heat exchange tube 4. Cutouts 17 are formed at corner parts of the plate fins 2 of two of the fin groups 3 adjacent to each other. Fitting-in parts 19 are formed by the cutouts 17 of the plate fins 2 of both the fin groups 3 adjacent to each other in the airflow direction. The straight tube parts 9 of the second heat exchange tube 8 are brought into contact with the plate fins 2 of both the fin groups 3 in a state fitted in the fitting-in parts 19. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an evaporator, and more particularly to an evaporator suitably used as an evaporator in a refrigeration cycle used in a refrigeration apparatus such as a refrigerator or a refrigerated showcase.

  In this specification and claims, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  For example, a refrigeration cycle including a compressor, a condenser, and an evaporator is installed in a heat insulating box of a refrigerator. As an evaporator of such a refrigeration cycle, a plurality of fins arranged in parallel and spaced apart in the air flow direction, and all the plate fins of each fin group are penetrated. Widely used are a plurality of straight pipe parts fixed in a shape and two meandering pipe parts connected to each other and a meandering heat exchange pipe made up of one less number of bent pipe parts than the straight pipe parts. It has been.

  By the way, in such an evaporator, the moisture in the air causes frost formation on the outer peripheral surface of the portion passing through each plate fin in the straight tube portion of the heat exchange tube, and each plate fin has a straight tube. Frosting occurs around the part through which the part penetrates. The frost on each plate fin becomes considerably thick near the straight pipe portion and gradually becomes thin as the distance from the straight pipe portion increases. When such frost formation occurs, the amount of air flowing between the plate fins of each fin group becomes abruptly reduced due to frost, or the amount of heat transfer between the air and the refrigerant flowing in the heat exchange pipe is reduced. There is a problem that the cooling performance is lowered in a relatively short time due to a rapid decrease. Such a decrease in cooling performance is particularly remarkable on the upstream side of the air flow where the amount of frost formation increases.

Therefore, various defrosting devices have been used conventionally, and specific examples thereof are described in Patent Document 1. The first defrosting device described in Patent Document 1 is provided with a defrosting heater for heating the evaporator by radiant heat below the evaporator in the heat insulating box (Patent Document 1, paragraph 0035, (See FIG. 1). In the second defrosting device, a meandering pipe heater is fitted into a notch formed in a plate fin of an evaporator (see Patent Document 1, paragraphs 0062 to 0066, FIG. 7). ). However, even if the two defrosting devices described in Patent Document 1 are used, defrosting must be frequently performed as long as frost formation as described above occurs.
JP 2002-130918 A

  An object of the present invention is to provide an evaporator that solves the above-described problems and can prevent a decrease in cooling performance for a relatively long time.

  In order to achieve the above object, the present invention comprises the following aspects.

  1) A plurality of plate fins arranged in parallel, a plurality of straight pipe portions fixed in a penetrating manner to the plate fins, and two adjacent straight pipe portions connected to each other and bent by one less than the straight pipe portions A first heat exchange pipe composed of a pipe section, a plurality of straight pipe sections and two adjacent straight pipe sections connected to each other, and one less bent pipe section than the straight pipe section; The evaporator for refrigerators which is provided with the 2nd heat exchange pipe connected to one end, and the straight pipe part of the 2nd heat exchange pipe is made to contact the plate fin.

  2) The evaporator according to 1) above, wherein the straight pipe portion of the second heat exchange tube is in contact with the air flow direction in the plate fin and the side edge portion in the direction orthogonal to the straight pipe portion of the first heat exchange pipe.

  3) The evaporator according to 2) above, wherein the straight pipe portion of the second heat exchange pipe is in contact with the plate fin in the entire air flow direction.

  4) The evaporator according to 3) above, wherein the pitch between the straight pipe portions adjacent to each other in the air flow direction of the second heat exchange pipe is uniform.

  5) The evaporator according to 3) above, wherein the pitch between the straight pipe portions adjacent to each other in the air flow direction of the second heat exchange pipe is smaller on the downstream side in the air flow direction than on the upstream side.

  6) The evaporator according to 2) above, wherein the straight pipe portion of the second heat exchange pipe is in contact with the plate fin on the upstream side in the air flow direction.

  7) The evaporator according to any one of 1) to 6) above, wherein a plurality of fin groups including a plurality of plate fins arranged in parallel are provided at intervals in the air flow direction.

  8) The evaporator according to 7) above, wherein the plate fins of all fin groups are flat.

  9) The evaporator according to 7) above, wherein the heat transfer area of the plate fins in the fin group on the downstream side in the air flow direction is larger than the heat transfer area of the plate fins in the fin group on the upstream side in the air flow direction.

  10) The evaporator according to 9) above, wherein the plate fins of the fin group on the upstream side in the air flow direction are flat and the plate fins of the fin group on the downstream side in the air flow direction are corrugated.

  11) The evaporator according to any one of the above items 7) to 10), wherein the fin pitch of the fin group on the downstream side in the air flow direction is smaller than the fin pitch of the fin group on the upstream side in the air flow direction.

  12) The evaporator according to any one of 7) to 11) above, wherein two straight pipe portions of the first heat exchange pipe are fixed in a penetrating manner to all the plate fins of each fin group.

  13) Any one of the above 7) to 12), wherein the straight pipe portion of the second heat exchange pipe is brought into contact with the plate fin in a state of being fitted into a fitting portion made of a notch formed in the plate fin. The evaporator according to crab.

  14) Notches are formed in the corners of the plate fins of the two fin groups adjacent to each other in the air flow direction, and fitting portions are provided by the notches of the plate fins of both fin groups adjacent in the air flow direction. The evaporator according to 13) above, wherein the straight pipe portion of the exchange pipe is brought into contact with the plate fins of both fin groups in a state of being fitted into the fitting portion.

  15) The evaporator according to 13) or 14) above, wherein a collar that is in surface contact with the outer peripheral surface of the straight pipe portion is integrally formed at a peripheral portion of the notch in the plate fin.

  16) Ends of two straight pipe portions, in which side plates are arranged on the outer sides of the plate fins in all fin groups, and are connected to both side plates by the bent pipe portion and the bent pipe portion of the first heat exchange pipe, respectively. A through hole through which the portion passes and a notch into which an end of the straight pipe portion of the second heat exchange pipe fits, and fixing pieces are formed on both sides of the notch in the side plate, The evaporator according to any one of 7) to 15), wherein an end portion of the straight pipe portion is fitted into a notch of the side plate and is sandwiched and fixed by both fixing pieces.

  17) The evaporator according to any one of 1) to 16) above, wherein the plate fins and the first and second heat exchange tubes are made of aluminum.

  18) A hairpin tube, a plurality of straight pipe portions and two adjacent straight pipe portions, a second heat exchange pipe comprising a number of bent pipe portions, one less than the straight pipe portion, and two through holes Preparing a plurality of plate fins, forming notches at each corner of each plate fin, passing both straight pipe portions of the hairpin tube through the through holes of all plate fins, and plate fins A plurality of fin groups composed of a plurality of parallel plate fins spaced apart in the length direction of the straight tube portion, and the hairpin tube with fins at the same position with respect to the length direction of the straight tube portion. Forming a first heat exchange tube with fins by bending both straight pipe portions in a meandering manner by bending the two fin-less portions adjacent to each other and reversing the bending direction of two adjacent fin-less portions. heat The straight pipe portion of the exchange tube is fitted into the fitting portion formed of a notch formed in the corner portion of the plate fin of the two adjacent fin groups of the first heat exchange tube with fins, and the first heat exchange tube The manufacturing method of the evaporator including joining one end part and the one end part of a 2nd heat exchange pipe.

  19) A bent pipe part of the first heat exchange pipe with fins and a through hole through which the ends of the two straight pipe parts connected by the bent pipe part pass, and an end part of the straight pipe part of the second heat exchange pipe Preparing a pair of side plates each having a notch to be fitted and fixing pieces respectively formed on both sides of each notch; a straight pipe portion of the second heat exchange pipe is adjacent to the first heat exchange pipe with fins; After fitting into the fitting part which consists of a notch formed in the corner | angular part of the plate fin of two fin groups, both sides are outside the arrangement direction of the plate fins of all the fin groups in the finned first heat exchange pipe , The bent pipe part of the first heat exchange pipe with fins and both ends of the two straight pipe parts connected by the bent pipe part are respectively passed through the through holes of both side plates, and the straight line of the second heat exchange pipe Insert both ends of the pipe part into the cutouts on both side plates, Deforming the fixing pieces of the side plates each time, the 18) A method of manufacturing an evaporator according to comprising clamping fixing the straight tube portions of the second heat exchange tubes by a fixing piece.

  20) A refrigeration cycle comprising a compressor, a condenser and an evaporator, wherein the evaporator comprises the evaporator described in any one of 1) to 17) above.

  21) A refrigeration apparatus in which the refrigeration cycle according to 20) is installed in a heat insulating box.

  22) The refrigeration apparatus according to 21) above, wherein a defrosting device that heats the evaporator by radiant heat is disposed below the evaporator of the refrigeration cycle in the heat insulating box.

  When the evaporator of 1) above is applied to the refrigeration cycle of the refrigeration apparatus, the straight pipe part of the second heat exchange pipe is in contact with the plate fin, so that each plate fin in the straight pipe part of the first heat exchange pipe is In addition to the outer peripheral surface of the penetrating portion and the periphery of the portion through which the straight pipe portion of each plate fin penetrates, the outer peripheral surface of the portion in contact with the plate fin and the plate fin in the straight pipe portion of the second heat exchange pipe Frost is also generated in the vicinity of the portion in contact with the straight pipe portion. By the way, since the amount of moisture in the air is limited, the total amount of frost formation is almost constant. Therefore, the thickness of the frost in each part becomes uniform as a whole, which is thinner than in the case of the evaporator described in Patent Document 1, the amount of air flowing between the plate fins of each fin group, and the heat exchange with air. The decrease in the amount of heat transfer with the refrigerant flowing in the pipe becomes moderate. As a result, it is possible to prevent the cooling performance from being lowered for a relatively long time.

  According to the evaporator of 2), the operation of arranging the second heat exchange pipe so that the straight pipe portion contacts the plate fin can be performed relatively easily.

  According to the evaporators 3) and 4), the same effect as 1) is obtained on the upstream side in the air flow direction with a large amount of frost formation. In addition, since the amount of frost increases on the upstream side in the air flow direction as compared with the evaporator described in Patent Document 1, the amount of moisture in the air decreases on the downstream side in the air flow direction and the frost amount is compared. In this case, it is possible to reduce the fin pitch of the plate fins on the downstream side in the air flow direction, and the straight pipe portion of the second heat exchange pipe is provided on the plate fins on the downstream side in the air flow direction. Combined with the contact, the cooling performance on the downstream side in the air flow direction is improved. Therefore, the entire evaporator can be reduced in size.

  According to the evaporators 3) and 5), the effect 1) is further improved on the upstream side in the air flow direction with a large amount of frost formation. In addition, since the amount of frost increases on the upstream side in the air flow direction as compared with the evaporator described in Patent Document 1, the amount of moisture in the air decreases on the downstream side in the air flow direction and the frost amount is compared. In this case, it is possible to reduce the fin pitch of the plate fins on the downstream side in the air flow direction, and the straight pipe portion of the second heat exchange pipe is provided on the plate fins on the downstream side in the air flow direction. Combined with the contact and the fact that the pitch between the adjacent straight pipe portions of the second heat exchange pipe is smaller on the downstream side in the air flow direction than on the upstream side, The cooling performance is further improved. Therefore, the entire evaporator can be reduced in size.

  According to the evaporator of 6), the same effect as in 1) is obtained on the upstream side in the air flow direction where the amount of frost formation is large. In addition, since the amount of frost increases on the upstream side in the air flow direction as compared with the evaporator described in Patent Document 1, the amount of moisture in the air decreases on the downstream side in the air flow direction and the frost amount is compared. In this case, however, the fin pitch of the plate fins on the downstream side in the air flow direction can be reduced, and the cooling performance on the downstream side in the air flow direction is further improved. Therefore, the entire evaporator can be reduced in size.

  According to the evaporators 9) and 10), the cooling performance on the downstream side in the air flow direction is further improved. That is, the amount of frost increases on the upstream side in the air flow direction as compared with the evaporator described in Patent Document 1, so the amount of moisture in the air decreases on the downstream side in the air flow direction and the frost amount is compared. As a result, it is not necessary to make the shape of the plate fin downstream in the air flow direction into a flat plate suitable for removing frost. Therefore, the shape of the plate fin on the downstream side in the air flow direction is, for example, a corrugated plate, so that the heat transfer area can be made larger than that on the plate fin on the upstream side in the air flow direction to improve the cooling performance. The overall size of the vessel can be reduced.

  According to the evaporator 11), the fin pitch of the fin group on the downstream side in the air flow direction is smaller than the fin pitch of the fin group on the upstream side in the air flow direction, so that the cooling performance is improved. Therefore, the entire evaporator can be reduced in size. In addition, since the amount of frost increases on the upstream side in the air flow direction as compared with the evaporator described in Patent Document 1, the amount of moisture in the air decreases on the downstream side in the air flow direction and the frost amount is compared. Even if the fin pitch of the plate fins on the downstream side in the air flow direction is reduced, it is possible to prevent a decrease in the amount of air flowing between the plate fins of each fin group due to frost becoming resistance. .

  According to the evaporators 13) and 14), the straight pipe portion of the second heat exchange pipe can be reliably brought into contact with the plate fin.

  In particular, according to the evaporator 14), the following effects can be obtained. That is, since the pipe heater described in Patent Document 1 is normally used by being fitted into a fitting portion provided by a notch formed at the corners of the plate fins of both fin groups adjacent to each other in the air flow direction. According to the evaporator of 14), it is possible to use the same plate fin as the conventional plate fin. Therefore, the manufacturing cost of the plate fin is reduced.

  According to the evaporator 15), the straight pipe portion of the second heat exchange pipe and the plate fin are firmly contacted, and the heat transfer area between the two is increased.

  According to the evaporator 16), the second heat exchange tube can be easily fixed. Moreover, since the side plate is normally provided in this type of evaporator, no special member is required for fixing the second heat exchange tube.

  According to the evaporator 17), the cooling performance can be improved and the overall weight can be reduced.

  According to the production method of 18), the evaporator of 14) can be produced relatively easily.

  According to the manufacturing method 19), the evaporator 16) can be manufactured relatively easily.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same part and the same thing through all drawings, and the overlapping description is abbreviate | omitted.

  In the following description, the top, bottom, left and right in FIGS. 1, 2, 10, and 11 are referred to as top and bottom, and left and right. The front side of FIG. 2 (the right side in FIG. 3 and the left side in FIG. 4) is the front and the opposite side. Let's call it after.

Embodiment 1
This embodiment is shown in FIGS.

  1 to 4 show the overall configuration of the evaporator according to Embodiment 1, and FIGS. 5 and 6 show the configuration of the main part thereof. 7 to 9 show a method for manufacturing the evaporator according to the first embodiment.

  1 to 4, the evaporator (1) is composed of a plurality of aluminum plate fins (2) arranged in parallel in the left-right direction, and a plurality of evaporators (1) are provided at intervals in the vertical direction (ventilation direction). A fin group (3), a plurality of straight pipe parts (5) extending in the left-right direction fixed to the plate fins (2) of each fin group (3) and two adjacent straight pipe parts (5) A first aluminum heat exchange pipe (4) consisting of a bent pipe section (6) and (7), one less than the straight pipe section (5), and a plurality of straight pipe sections (9) extending in the left-right direction And two adjacent straight pipe portions (9) are connected to each other, and the number of bent pipe portions (11) and (12) is one less than the straight pipe portion (9), and one end of the first heat exchange pipe (4). And a second aluminum heat exchange pipe (8) connected to each other, and aluminum side plates (13) and (14) arranged on the outer side in the left-right direction of all the fin groups (3).

  As shown in FIG. 5, the plate fin (2) has a rectangular flat plate shape that is long in the front-rear direction, and two through holes (15) are formed at intervals in the front-rear direction at the center in the height direction. ing. A collar (16) is integrally formed over the entire periphery at the peripheral edge of each through hole (15) in the plate fin (2). In addition, a notch (17) is formed at each corner of the plate fin (2), and a collar (18) is integrally formed at the peripheral edge of each notch (17) in the plate fin (2). Yes. And the fitting part by which the straight pipe part (9) of a 2nd heat exchange pipe (8) is inserted by the notch (18) of the two plate fins (2) which the fin group (3) adjacent up and down adjoined. (19) is formed.

  The fin pitch between adjacent plate fins (2) of the fin group (3) on the downstream side (upper side) in the air flow direction is smaller than the fin pitch of the fin group (3) on the upstream side (lower side) in the air flow direction. ing. In the illustrated example, the fin pitch between adjacent plate fins (2) of the fin group (3) is the largest at the lower end fin group (3) and decreases toward the upper fin group (3). If the fin pitch of the upper fin group (3) is smaller than the fin pitch of the lower fin group (3), the fin pitch of the plurality of fin groups (3) adjacent vertically is The fin pitches of the fin group (3) may be arbitrary.

  The first heat exchange pipe (4) includes a plurality of straight pipe sections (5) provided at intervals in the vertical direction within the same vertical plane and extending in the left-right direction, and straight pipe sections (5) adjacent to each other in the vertical direction. The two meandering pipe parts (4A) and (4B) consisting of the first bent pipe parts (6) that connect the left and right alternately are arranged at intervals in the front and rear, and both meandering pipe parts (4A) (4B ) Are connected by connecting the right end portions of the straight pipe portion (5) at the lower end with a second bent pipe portion (7). The straight pipe part (5) of each serpentine pipe part (4A) (4B) is passed through each through hole (15) of the plate fin (2) of each fin group (3), and the outer circumference of the straight pipe part (5) It is fixed to the plate fin (2) so that the surface is in close contact with the collar (16).

  The second heat exchange pipe (8) includes a plurality of straight pipe portions (9) provided in the same vertical plane at intervals in the vertical direction and extending in the left-right direction, and straight pipe portions (9) adjacent to each other in the vertical direction. Two meandering pipe parts (8A) and (8B) consisting of first bent pipe parts (11) that connect the left and right alternately are arranged at intervals in the front and rear, and both meandering pipe parts (8A) (8B) ) Are connected by connecting the right end portions of the straight pipe portion (9) at the lower end with the second bent pipe portion (12). The pitch between the straight pipe portions (9) adjacent to the upper and lower sides of the meandering pipe portions (8A) and (8B) is large on the lower side and decreases as it goes upward. The other straight pipe portions (9) except for the straight pipe portion (9) at the lower end of each meandering pipe portion (8A) (8B) are two plate fins ( 2) The straight pipe part (9) is fitted into the fitting part (19) consisting of the notch (17) so that the outer peripheral surface is in close contact with the collar (18). Are in contact with both front and rear edges of the plate fin (2). In addition, the straight pipe part (9) at the lower end of each meandering pipe part (8A) (8B) is partly colored in the notch (17) on the lower side of the fin group (3) at the lower end. The straight pipe portion (9) is in contact with the front and rear side edges of the plate fin (2). In addition, since the pitch between the straight pipe parts (9) adjacent to the upper and lower sides of each meandering pipe part (8A) (8B) is large on the lower side and becomes smaller toward the upper side, the fitting part (19) Some of them do not have the straight pipe portions (9) of the meandering pipe portions (8A) (8B). Further, the left end portion of the straight pipe portion (9) at the upper end of the meandering pipe portion (8B) on the rear side of the second heat exchange pipe (8) is bent forward in a U shape, and the bent portion (21) The distal end portion is joined to the left end portion of the straight pipe portion (5) at the upper end of the meandering tube portion (4A) on the front side of the first heat exchange tube (4).

  The left side plate (13) has a through hole (22) through which the left end portion of the straight pipe portion (5) at the upper end of both meandering tube portions (4A) and (4B) of the first heat exchange tube (4) passes, A vertically long through-hole (23) that passes through the left end of the first straight pipe part (5) that is connected by the first bent pipe part (6) and each first bent pipe part (6) of the heat exchange pipe (4). In addition, a notch (24) for fitting the left end portion of each straight pipe portion (9) in both meandering pipe portions (8A) and (8B) of the second heat exchange pipe (8) is formed. The right side plate (14) has a first bent pipe portion (6) of the first heat exchange pipe (4) and a straight pipe portion (5) vertically adjacent to each other connected by the first bent pipe portions (6). A straight pipe portion adjacent to the front and rear connected by the vertically long through hole (23) passing through the right end portion, the second bent pipe portion (7) and the second bent pipe portion (7) of the first heat exchange pipe (4) (5 ) Through the right end of the straight through hole (26) and the notch into which the right end of each straight pipe part (9) in the two meandering pipe parts (8A) (8B) of the second heat exchange pipe (8) (24) is formed. Fixing pieces (28) are integrally formed on the upper and lower edges of the notch (24) in each side plate (13) (14), and each straight pipe portion (9) of the second heat exchange pipe (8) is formed. ) Is fitted in the notch (24) and is clamped and fixed by both fixing pieces (28) (see FIG. 6). Both fixed pieces (28) are deformed from the state indicated by the chain line in FIG. The notches (24) are formed in all the portions corresponding to the space between the fin groups (3) that are vertically adjacent to each other, and the straight pipe portions that are adjacent to the upper and lower sides of each meandering pipe portion (8A) (8B). Since the pitch between (9) is large on the lower side and becomes smaller toward the upper side, the straight pipe part of the second heat exchange pipe (8) is fitted into the notch (24). Some are not.

  In the evaporator (1), the refrigerant enters the second heat exchange pipe (8) from the left end of the straight pipe section (9) at the upper end of the front meandering pipe section (8A) of the second heat exchange pipe (8). Flows in the second and first heat exchange pipes (8) and (4), exchanges heat with the air flowing upward from below as shown by arrow X in FIG. ) Flows out from the left end of the straight pipe at the upper end of the rear meandering pipe (4B).

  And the outer peripheral surface of the part which has penetrated each plate fin (2) in the straight pipe part (5) of the 1st heat exchange pipe (4), the straight pipe part (5) in each plate fin (2) penetrated The peripheral portion of the through hole (15), the outer peripheral surface of the portion in contact with the plate fin (2) in the straight pipe portion (9) of the second heat exchange pipe (8), and the straight pipe in the plate fin (2) Frosting occurs in the vicinity of the part in contact with the part (9). By the way, since the amount of moisture in the air is limited, the total amount of frost formation is almost constant. Therefore, the frost thickness of each part is uniform and thin as a whole, the amount of air flowing between the plate fins (2) of each fin group (3) is reduced, and the air and both heat exchange tubes (4) (8) The decrease in the amount of heat transfer with the refrigerant flowing inside becomes moderate. As a result, it is possible to prevent the cooling performance from being lowered for a relatively long time. In particular, the effect described above is further improved on the lower side which is the upstream side in the air flow direction with a large amount of frost formation.

  In addition, the fin pitch of the fin group (3) on the downstream side in the air flow direction is smaller than the fin pitch of the fin group (3) on the upstream side in the air flow direction. 2 The straight pipe part (9) of the heat exchange pipe (8) is in contact, and the straight pipe part adjacent to the upper and lower sides of the meandering pipe parts (8A) (8B) of the second heat exchange pipe (8) Combined with the fact that the pitch between (9) is smaller on the downstream side in the air flow direction, the cooling performance on the downstream side in the air flow direction is further improved. Therefore, it is possible to reduce the size of the entire evaporator (1). Moreover, since the amount of frost on the upstream side in the air flow direction increases, the amount of moisture in the air decreases on the downstream side in the air flow direction, and the amount of frost formation becomes relatively small. Even if the fin pitch of the fin group (3) is reduced, it is possible to prevent a reduction in the amount of air flowing between the plate fins (2) of each fin group (3) due to resistance of frost.

  The evaporator (1) is manufactured as follows.

  First, an aluminum hairpin tube (30) comprising two straight tube portions (31) and a bent tube portion (32) for connecting one end portions of both straight tube portions (31) is prepared, and a hairpin tube (30 ) Through the through holes (15) of the plurality of plate fins (2) and fixed to the plate fins (2), thereby forming fins comprising a plurality of parallel plate fins (2). The group (3) forms a finned hairpin tube (30) provided with a plurality of intervals in the length direction of the straight tube portion (31) (see FIG. 7).

  Next, the finned hairpin tube (30) is bent at the finless portion at the same position with respect to the length direction of the straight tube portion (31), and the bending direction at the two adjacent finless portions is reversed. As a result, both straight pipe parts (31) are meandered, and the second bent pipe part (7) comprising the two meandering pipe parts (4A) (4B) and the bent pipe part (32) of the hairpin-like pipe (30) The finned first heat exchange pipe (4) having the shape is formed (see FIG. 8).

  Next, the left end portion of the straight pipe portion (5) at the upper end of the two meandering tube portions (4A) and (4B) of the first heat exchange tube (4) with fins is passed through the through hole (22), and the first The left end of the first bent pipe portion (6) of the heat exchange pipe (4) and the straight pipe portion (5) adjacent to each other connected by the first bent pipe portion (6) is formed into a vertically long through hole (23). By passing, the left side plate (13) is arranged on the left side of the finned first heat exchange tube (4). Also, the first bent pipe part (6) of the finned first heat exchange pipe (4) and the right end part of the straight pipe part (5) vertically adjacent to each other connected by the first bent pipe parts (6) are vertically long. The straight pipe part (5) which is passed through the through hole (23) and adjacent to the front and rear connected by the second bent pipe part (7) and the second bent pipe part (7) of the finned first heat exchange pipe (4) The right side plate (14) is disposed on the right side of the finned first heat exchange pipe (4) by passing the right end of the first through the through hole (26). At this time, the fixing pieces (28) of the side plates (13) and (14) extend straight outward as indicated by chain lines in FIG.

  Next, the two meandering tube portions (8A) and (8B) of the second heat exchange tube (8) are slightly opened at the second bent tube portion (12) (see FIG. 9), and the two meandering tube portions (8A) ( 8B), except for the straight pipe portion (9) at the lower end, plate fins (2) of two adjacent fin groups (3) of the first heat exchange pipe (4) with fins Is fitted into a fitting part (19) consisting of a notch (17) formed at the corner of the lower end of the straight pipe part (9) at the lower end and a lower notch (17 at the lower end fin group (3)). ), And the both ends of the straight pipe part (9) of the two meandering pipe parts (8A) and (8B) of the second heat exchange pipe (8) are notched on both side plates (13) and (14), respectively. (24) Fit in.

  Finally, the fixing pieces (28) of the side plates (13) and (14) are deformed (see FIG. 6), and the straight pipe portion (9) of the second heat exchange pipe (8) is clamped by the fixing pieces (28). Fix it. Thus, the evaporator (1) is manufactured.

Embodiment 2
This embodiment is shown in FIG.

  In the case of the evaporator (40) of Embodiment 2, the number of straight pipe portions (9) in both meandering pipe portions (8A) and (8B) of the second heat exchange pipe (8) is the number of fin groups (3). The pitches between the straight pipe portions (9) that are equal and adjacent in the vertical direction are all equal. All the other straight pipe portions (9) except for the straight pipe portion (9) at the lower end are notched (18) in the two plate fins (2) adjacent to each other in the upper and lower adjacent fin groups (3). The straight pipe part (9) is fitted into the fitting part (19) so that the outer peripheral surface of the straight pipe part (9) is in close contact with the collar (18), so that the straight pipe part (9) is placed before and after the plate fin (2). It touches both side edges. The straight pipe portion (9) at the lower end is arranged in the notch (17) on the lower side of the fin group (3) at the lower end, and the outer peripheral surface of the straight pipe portion (9) is in close contact with the collar (18). In this manner, the plate fins (2) are in contact with the front and rear side edges.

  Other configurations are the same as those of the evaporator (1) of the first embodiment.

Embodiment 3
This embodiment is shown in FIG.

  In the case of the evaporator (50) of Embodiment 3, a predetermined number from the upper end, here, the plate fins (51) of the two fin groups (3) are corrugated, and the heat transfer area is flat. It is larger than the plate fin (2). Moreover, the notch is not formed in the corner | angular part of a corrugated plate fin (51).

  The height of the two meandering pipe sections (8A) before and after the second heat exchange pipe (8) is lower than the overall height of the evaporator (1), and the straight pipe section of the two meandering pipe sections (8A) (8B) ( 9) is arranged between the vertically adjacent fin groups (3) having the flat plate fins (2), and is fitted into the fitting portion (19). Further, the straight pipe portion (9) at the upper end of the rear meandering pipe portion (8B) of the second heat exchange pipe (8) is bent upward and bent forward, and the distal end portion of the bent portion (52). Is joined to the left end of the straight pipe part (5) at the upper end of the front meandering pipe part (4A) of the first heat exchange pipe (4).

  Other configurations are the same as those of the evaporator (1) of the first embodiment.

  The evaporator (1) of the second and third embodiments is manufactured in the same manner as the evaporator (1) of the first embodiment.

  The evaporators (1), (40), and (50) of Embodiments 1 to 3 constitute a refrigeration cycle together with the compressor and the condenser. Such a refrigerating cycle is arrange | positioned in the heat insulation box of a refrigerator. In this refrigeration apparatus, a defrosting device for heating the evaporator (1) by radiant heat is disposed below the evaporators (1), (40), and (50) of the refrigeration cycle in the heat insulation box.

  In the first to third embodiments, the fin pitch between adjacent plate fins of the fin group on the downstream side (upper side) in the air flow direction is smaller than the fin pitch of the fin group on the upstream side (lower side) in the air flow direction. However, the present invention is not limited to this, and the fin pitches of all the fin groups may be equal.

It is a perspective view which shows the whole structure of the evaporator of Embodiment 1 of this invention. It is the II-II sectional view taken on the line of FIG. It is a left view which shows the whole structure of the evaporator of Embodiment 1 of this invention. It is a right view which shows the whole structure of the evaporator of Embodiment 1 of this invention. It is a partial expansion perspective view which shows the plate fin of the evaporator of FIG. It is an enlarged view which shows a part of side plate of the evaporator of FIG. It is a figure which shows one process in the manufacturing method of the evaporator of FIG. It is a figure which shows the process different from FIG. 7 in the manufacturing method of the evaporator of FIG. It is a figure which shows the process different from FIG.7 and FIG.8 in the manufacturing method of the evaporator of FIG. It is a perspective view which shows the whole structure of the evaporator of Embodiment 2 of this invention. It is a perspective view which shows the whole structure of the evaporator of Embodiment 3 of this invention.

Explanation of symbols

(1) (40) (50): Evaporator
(2) (51): Plate fin
(3): Fin group
(4): 1st heat exchange tube
(5): Straight pipe
(6) (7): Bent tube
(8): Second heat exchange tube
(9): Straight pipe
(11) (12): Bent tube
(13) (14): Side plate
(17): Notch
(18): Color
(19): Insertion section
(23): Vertically long through hole
(24): Notch
(26): Horizontally long through hole
(28): Fixed piece
(30): Hairpin tube
(31): Straight pipe

Claims (22)

A plurality of plate fins arranged in parallel, a plurality of straight pipe portions fixed in a penetrating manner to the plate fins, and two adjacent straight pipe portions, and one less bent pipe portion than the straight pipe portions A first heat exchange pipe, a plurality of straight pipe sections and two adjacent straight pipe sections connected to each other and one bent pipe section less than the straight pipe section, and at one end of the first heat exchange pipe The evaporator which is provided with the connected 2nd heat exchange pipe, and the straight pipe part of the 2nd heat exchange pipe is made to contact with a plate fin. The evaporator according to claim 1, wherein the straight pipe portion of the second heat exchange pipe is in contact with the air flow direction in the plate fin and the side edge portion in a direction orthogonal to the straight pipe portion of the first heat exchange pipe. The evaporator according to claim 2, wherein the straight pipe portion of the second heat exchange pipe is brought into contact with the plate fin over the entire air flow direction. The evaporator according to claim 3, wherein the pitches between the straight pipe portions adjacent to each other in the air flow direction of the second heat exchange pipe are all uniform. The evaporator according to claim 3, wherein a pitch between straight pipe portions adjacent to each other in the air flow direction of the second heat exchange pipe is smaller on the downstream side in the air flow direction than on the upstream side. The evaporator according to claim 2, wherein the straight pipe portion of the second heat exchange pipe is in contact with the plate fin on the upstream side in the air flow direction. The evaporator according to any one of claims 1 to 6, wherein a plurality of fin groups including a plurality of plate fins arranged in parallel are provided at intervals in the air flow direction. The evaporator according to claim 7, wherein the plate fins of all the fin groups are flat. The evaporator according to claim 7, wherein the heat transfer area of the plate fins in the fin group on the downstream side in the air flow direction is larger than the heat transfer area of the plate fins in the fin group on the upstream side in the air flow direction. The evaporator according to claim 9, wherein the plate fin of the fin group on the upstream side in the air flow direction has a flat plate shape, and the plate fin of the fin group on the downstream side in the air flow direction has a corrugated plate shape. The evaporator according to any one of claims 7 to 10, wherein a fin pitch of the fin group on the downstream side in the air flow direction is smaller than a fin pitch of the fin group on the upstream side in the air flow direction. The evaporator according to any one of claims 7 to 11, wherein two straight pipe portions of the first heat exchange pipe are fixed in a penetrating manner to all the plate fins of each fin group. The straight pipe part of a 2nd heat exchange pipe is made to contact with a plate fin in the state inserted by the insertion part which consists of a notch formed in the plate fin. Evaporator. A notch is formed in the corner of the plate fin of two fin groups adjacent in the air flow direction, and a fitting portion is provided by the notch of the plate fin of both fin groups adjacent in the air flow direction. The evaporator according to claim 13, wherein the straight pipe portion is brought into contact with the plate fins of both fin groups in a state of being fitted into the fitting portion. The evaporator according to claim 13 or 14, wherein a collar in surface contact with the outer peripheral surface of the straight pipe portion is integrally formed at a peripheral portion of the notch in the plate fin. Side plates are arranged on the outer sides in the arrangement direction of the plate fins in all the fin groups, and the end portions of the two straight pipe portions connected to the both side plates by the bent pipe portion and the bent pipe portion of the first heat exchange pipe, respectively. A through hole to be passed through and a notch into which an end of the straight pipe portion of the second heat exchange pipe is fitted, and fixing pieces are formed on both sides of the cutout in the side plate, and the straight pipe of the second heat exchange pipe The evaporator according to any one of claims 7 to 15, wherein an end portion of the portion is fitted into a notch of the side plate and is fixed by being sandwiched by both fixing pieces. The evaporator according to any one of claims 1 to 16, wherein the plate fin and the first and second heat exchange tubes are made of aluminum. A plurality of hairpin tubes, a plurality of straight tube portions and a second heat exchange tube that connects two adjacent straight tube portions and includes a number of bent tube portions, one less than the straight tube portions, and a plurality of through holes. Plate fins, notches in each corner of each plate fin, and both straight tube sections of hairpin tubes are passed through the through holes of all plate fins and fixed to the plate fins. By providing a plurality of fin groups composed of a plurality of parallel plate fins at intervals in the length direction of the straight tube portion, the finned hairpin tube is in the same position with respect to the length direction of the straight tube portion. Bending at the finless portion and making the straight pipe portions meandering by reversing the bending direction at the two adjacent finless portions to form a finned first heat exchange tube, second heat exchange Fitting the straight pipe part of the pipe into a fitting part made of a notch formed in a corner part of a plate fin of two adjacent fin groups of the first heat exchange pipe with fins, and one end of the first heat exchange pipe The evaporator and the manufacturing method of the evaporator including joining the one end part of a 2nd heat exchange pipe | tube. A through-hole through which the end of two straight pipe parts connected by the bent pipe part and the bent pipe part of the first heat exchange pipe with fins passes, and the end where the end part of the straight pipe part of the second heat exchange pipe fits Preparing a pair of side plates each having a notch and a fixing piece formed on each side of each notch; connecting the straight pipe portion of the second heat exchange pipe to two adjacent fin heat exchange pipes; After fitting into the fitting part which consists of a notch formed in the corner | angular part of the plate fin of a fin group, both side plates are arrange | positioned on the outer side of the arrangement direction of the plate fin of all the fin groups in the 1st heat exchange pipe | tube with a fin. Passing both ends of two straight pipe parts connected by the bent pipe part and the bent pipe part of the first heat exchange pipe with fins through the through holes of both side plates, and the straight pipe part of the second heat exchange pipe Fit both ends into the cutouts on both side plates, The process according to claim 18 evaporator according to deform the fixing pieces of the side plates comprises securing clamping the straight pipe portion of the second heat exchange tubes by a fixing piece. A refrigeration cycle comprising a compressor, a condenser, and an evaporator, wherein the evaporator comprises the evaporator according to any one of claims 1 to 17. A refrigeration apparatus in which the refrigeration cycle according to claim 20 is installed in an insulating box. The refrigeration apparatus according to claim 21, wherein a defrosting device for heating the evaporator by radiant heat is disposed below the evaporator of the refrigeration cycle in the heat insulating box.

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