JP2008025890A - Showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a showcase capable of saving an installation space of a cooler and preventing clogging caused by frost formation of the cooler. <P>SOLUTION: As the cooler 50 is composed of a plurality of flat heat exchange tubes 53 arranged in a state that the cross-sectional longitudinal direction is directed to the air circulating direction, bent to circulate a refrigerant in a meandering state in the direction orthogonal to the air circulating direction, and arranged in the air circulating direction, and a first header 51 and a second header 52 to which both ends of each heat exchange tube 53 are connected, the air circulated in a ventilation trunk 30 is allowed to exchange heat with the refrigerant circulated in the heat exchange tubes 53, to be cooled to a prescribed temperature by bringing the air circulating in the ventilation trunk 30 into contact with outer faces of the plurality of heat exchange tubes 53 arranged in the air circulating direction, thus a size of the ventilation trunk 30 as an installation space of the cooler 50 can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a showcase for cooling and selling products stored in a product storage unit.

  Conventionally, as this type of showcase, there are a product storage unit for storing products, a ventilation path provided so as to be adjacent to the product storage unit, and a blower for circulating the air of the product storage unit through the ventilation path And a cooler for cooling the air flowing through the ventilation path, and the product storage unit is cooled by cooling the air in the product storage unit with the cooler and flowing into the product storage unit. Are known.

  In the showcase, a cross fin coil type evaporator is generally used as a cooler. The cross fin coil type evaporator is composed of an aluminum plate member and a copper tube. By passing the copper tube through a hole provided in the plate member and deforming the copper tube so as to increase the tube diameter, The copper tube and the plate member are joined. In this case, the heat transfer from the copper tube to the plate-like member is poor compared to the case where the copper tube and the plate-like member are joined by brazing, soldering, etc., so the external dimensions of the cooler cannot be reduced. In addition, the size of the ventilation path as the installation space for the cooler cannot be reduced.

Therefore, in order to reduce the installation space of the cooler, a multi-flow type comprising a pair of headers, a plurality of heat exchange tubes provided between the headers, and fins provided between the heat exchange tubes A showcase using the above evaporator as a cooler is known (for example, see Patent Document 1).
JP 2005-114345 A

  In a showcase using a multi-flow type evaporator as a cooler, the interval between fins provided between the heat exchange tubes of the evaporator is 1 mm to 4 mm, and clogging occurs due to frost formation on the fins. It becomes easy to do. For this reason, it is difficult to use the multiflow evaporator as a cooler for a showcase in which the evaporation temperature of the refrigerant is 0 ° C. or less.

  An object of the present invention is to provide a showcase capable of reducing the installation space of the cooler and preventing clogging due to frost formation of the cooler.

  In order to achieve the above object, the present invention provides a showcase body having a product storage section and a ventilation path for circulating air in the product storage section, and heat exchange between the air flowing through the ventilation path and the refrigerant. In a showcase provided with a cooler that cools the circulating air, the cooler is provided such that the longitudinal direction of the cross section faces the air flow direction, and the refrigerant flows while meandering in a direction perpendicular to the air flow direction. The plurality of flat heat exchange tubes bent in this manner and arranged in the air flow direction, and the first header and the second header to which both ends of each heat exchange tube are connected, respectively.

  Thereby, since the air which distribute | circulates a ventilation path contacts the outer surface of the several heat exchange tube arrange | positioned in the air distribution direction, the air which distribute | circulates a ventilation path heat-exchanges with the refrigerant | coolant which distribute | circulates each heat exchange tube. It is cooled to a predetermined temperature.

  According to the present invention, the air flowing through the ventilation path is brought into contact with the outer surfaces of the plurality of heat exchange tubes arranged in the air circulation direction, whereby the air flowing through the ventilation path and the refrigerant flowing through each heat exchange tube are heated. Since it can be exchanged and cooled to a predetermined temperature, the size of the ventilation path, which is the installation space for the cooler, can be reduced. In addition, the air flowing through the ventilation path is brought into contact with the outer surface of each heat exchange tube, so that the air flowing through the ventilation path can be heat exchanged with the refrigerant flowing through each heat exchange tube. It is possible to prevent clogging due to. In addition, since the refrigerant that exchanges heat with the air that circulates in the ventilation path is circulated through each heat exchange tube that is provided to meander in the direction orthogonal to the air circulation direction, the air that contacts each heat exchange tube The amount can be increased, and the number of parts and the number of processing steps can be reduced without arranging a plurality of heat exchange tubes in a direction orthogonal to the air flow direction.

  1 to 11 show a first embodiment of the present invention. FIG. 1 is an overall perspective view of the showcase, FIG. 2 is a side sectional view of the showcase, and FIG. 3 is a schematic configuration diagram of a refrigerant circuit. 4 is an overall perspective view of the cooler, FIG. 5 is a plan view of the cooler, FIG. 6 is a side sectional view of the cooler, FIG. 7 is a sectional view of the first header, and FIG. FIG. 9 is an overall perspective view of the spacer, FIG. 10 is a plan sectional view of the main part of the showcase showing the mounting state of the cooler, and FIG. 11 is a side sectional view of the main part of the showcase showing the mounting state of the cooler.

  This showcase is provided with a product storage unit 20 for storing products to be sold and a ventilation path 30 for cooling the air in the product storage unit 20 inside the showcase body 10 whose front is opened. ing.

  In the showcase body 10, the upper surface side, the back surface side, and the bottom surface side are formed by the heat insulating walls 11, and the left and right side surfaces are covered with the glass plates 12. A machine room 40 in which devices such as the compressor 41, the radiator 42, and the radiator fan 43 are accommodated is provided below the heat insulating wall on the bottom side of the showcase body 10.

  The product storage unit 20 is provided in a space surrounded by the top plate 21, the back plate 22, the bottom plate 23, and the glass plate 12 that are spaced apart from the inner surface of the heat insulating wall 11 of the showcase body 10. . A plurality of product shelves 24 are arranged one above the other in the product storage unit 20, and products are placed on the bottom plate 23 and the top surfaces of the product shelves 24.

  The ventilation path 30 is provided between the inner surface of the heat insulating wall 11 and the top plate 21, the back plate 22, and the bottom plate 23. The ventilation path 30 communicates with the product storage unit 20 through an air suction port 31 provided in the left and right direction at the lower end of the opening of the showcase body 10, and the left and right of the upper end of the opening of the showcase body 10. It communicates with the product storage unit 20 through an air discharge port 32 provided across the direction. The ventilation path 30 located on the back side of the product storage unit 20 is provided with a cooler 50 for cooling the air flowing through the ventilation path 30, and the ventilation path 30 located on the bottom side of the product storage unit 20 includes A cooler blower 33 for circulating air through the ventilation path 30 is provided.

  As shown in FIG. 3, the cooler 50 is connected to a refrigerant circuit including a compressor 41, a radiator 42, and an expansion valve 44. That is, the refrigerant inflow side of the compressor 41 is connected to the refrigerant inflow side of the radiator 42 by the pipe 45, and the refrigerant inflow side of the radiator 42 is connected to the refrigerant inflow side of the expansion valve 44 by the pipe 45. The refrigerant inflow side of the cooler 50 is connected to the refrigerant outflow side of the expansion valve 44 by a pipe 46, and the refrigerant intake side of the compressor 41 is connected to the refrigerant outflow side of the cooler 50 by a pipe 47. A refrigerant such as carbon dioxide is sealed in the refrigerant circuit, and the refrigerant that has become high temperature and high pressure in the compressor 41 is cooled in the radiator 42 and decompressed in the expansion valve 44 and then flows into the cooler 50. The heat is absorbed and evaporated by heat exchange with the air flowing through the ventilation path 30 and is sucked into the compressor 41.

  The cooler 50 includes a first header 51 and a second header 52 that extend in the vertical direction (air flow direction) of the ventilation path 30 on the back side of the product storage unit 20, and both end portions of the first header 51 and the second header 52, respectively. It has a plurality of heat exchange tubes 53 connected to the second header 52 and arranged in the vertical direction (air flow direction) of the ventilation path 30.

  The first header 51 and the second header 52 are each formed of a hollow cylindrical member made of a metal such as aluminum, and the first header 51 is provided on the back side on the right side of the ventilation path 30. Two headers 52 are provided on the left front side of the ventilation path 30. A plurality of tube connection holes 51a and 52a are provided along the central axis direction on the left outer peripheral surface of the first header 51 and the right outer peripheral surface of the second header 52, and both end portions of each heat exchange tube 53 are respectively It connects with the tube connection holes 51a and 52a. The tube connection holes 51a and 52a are arranged in a zigzag pattern along the central axis direction of the headers 51 and 52, and the distance between the adjacent tube connection holes 51a and 52a is described later with respect to the heat exchange tube 53. It is provided so as to be half the distance between the straight pipe portions.

  In addition, the first header 51 is divided into an upper part (air flow direction) and a space 51b located on the upper side (downstream side in the air flow direction) and a space located on the lower side (upstream side in the air flow direction). 51c is provided. The first header 51 has a pipe 46 connected to the upper space 51b and a pipe 47 connected to the lower space.

  Each heat exchange tube 53 is a flat tube made of aluminum or the like having a cross-sectional shape formed in an elliptical shape, a rectangular shape or a polygonal shape, and a plurality of refrigerant passages 53a provided in the longitudinal direction of the cross-section. Each heat exchange tube 53 is formed to extend in a meandering manner in the horizontal direction (direction perpendicular to the air flow direction) toward the upper and lower sides (air flow direction) of the air passage 30 in the longitudinal direction of the cross section. Each heat exchange tube 53 includes a plurality of straight pipe portions 53b arranged in front and rear so as to be parallel to each other, a bent portion 53c communicating with the straight pipe portions 53b adjacent to each other in the front and rear, and both end sides parallel to the straight pipe portion 53b. And a connecting portion 53d provided so as to extend.

  Each heat exchange tube 53 is connected to each tube connection hole 51a, 52a arranged in a staggered manner in each header 51, 52 in each heat exchange tube 53 so that each straight pipe portion 53b is adjacent in the vertical direction (air flow direction). Each straight pipe part 53b is positioned between the straight pipe part 53b and the straight pipe part 53b of the adjacent heat exchange tube 53 without overlapping each straight pipe part 53b of the matching heat exchange tube 53 in the vertical direction (air flow direction). It is like that.

  Each heat exchange tube 53 is formed such that the distance D1 between the straight pipe portion 53b and the adjacent straight pipe portion 53b is 6 mm to 25 mm, and between the straight pipe portion 53b and the adjacent straight pipe portion 53b. Spacers 54 for holding the distance and the distance between the adjacent heat exchange tubes 53 are attached to the left and right sides and the center in the left and right direction. The spacer 54 is composed of a plate-like member extending in the front-rear direction provided with a plurality of slits 54a into which the straight pipe portion 53b can be inserted at the lower end side, and the distance between the straight pipe portions 53b is maintained by the member 54b between the slits 54a. The distance between each heat exchange tube 53 and the adjacent heat exchange tube 53 is maintained by the member on the upper end side. Moreover, the distance D2 between each straight pipe part 53b of each heat exchange tube 53 and each straight pipe part 53b of the adjacent heat exchange tube 53 is set to 6 mm to 25 mm.

  The cooler 50 is attached to the ventilation path 30 located on the back side of the product storage unit 20 by an attachment member 60. The attachment member 60 includes a pair of first fixing plates 61 extending in the vertical direction with a space in the left-right direction between the cooler 50 and the heat insulating wall 11, and between the cooler 50 and the back plate 22. A pair of second fixing plates 62 extending in the vertical direction at intervals in the left-right direction, a first fixing screw 63 for fixing each first fixing plate 61 to the heat insulating wall 11, and each second fixing It consists of a second fixing screw 64 for fixing the plate 62 to the back plate 22. Each first fixing plate 61 and each second fixing plate 62 are fixed to the cooler 50 by brazing or soldering, and the first fixing plate 61 and each second fixing plate 62 are insulated from the heat insulating wall 11. And the cooler 50 is attached to the ventilation path 30 by fixing to the back plate 22. Between the cooler 50 and the heat insulating wall 11 and between the cooler 50 and the back plate 22, spaces through which air flows are formed by the first fixing plates 61 and the second fixing plates 62, respectively. The cooling efficiency of the cooler 50 is improved by bringing air into contact with the front side of the straight pipe portion 53b located on the front face of the cooler 50 and the back side of the straight pipe portion 53b located on the back face of the cooler 50. ing.

  Furthermore, the cooler 50 includes a pair of left and right sides that extend forward from the first header 51 to the top and bottom of the first header 51 and extend rearward from the second header 52 to the top and bottom of the second header 52. The guide plate 65 is provided. Each guide plate 65 covers both the left and right sides of the cooler 50 so that the air flowing through the ventilating path 30 contacts the heat exchange tubes 53 without leaking air from the left and right sides of the cooler. It is supposed to let you.

  In the showcase configured as described above, the air in the product storage unit 20 sucked into the ventilation path 30 from the air suction port 31 by the cooler blower 33 is cooled by exchanging heat with the refrigerant that absorbs heat in the cooler 50. Then, the product discharged from the air discharge port 32 to the product storage unit 20 and placed on the bottom plate 23 and each product shelf 24 of the product storage unit 20 is cooled and stored.

  In the cooler 50, the refrigerant flows into the space 51 b on the upper side (downstream side in the air flow direction) of the first header 51 from the pipe 46, branches off from the space 51 b, and is on the upper side (downstream side in the air flow direction). The heat exchange tube 53 is distributed. The refrigerant flowing through each heat exchange tube 53 on the upper side (downstream side in the air flow direction) flows into the second header 52 and branches to flow through each heat exchange tube 53 on the lower side (upstream side in the air flow direction). To do. The refrigerant flowing through the heat exchange tubes 53 on the lower side (upstream side in the air flow direction) flows into the space 51 c on the lower side (upstream side in the air flow direction) of the first header 51, and is compressed through the pipe 47. 41 is inhaled.

  At this time, the air flowing through the ventilation path 30 flows while being in contact with the outer surfaces of the plurality of heat exchange tubes 53 arranged in the air flow direction. Thereby, since the air which distribute | circulates the ventilation path 30 is cooled by exchanging heat with the refrigerant | coolant which distribute | circulates each heat exchange tube 53, it becomes possible to cool to predetermined temperature reliably. Further, the distance D1 between the straight pipe portions 53b of each heat exchange tube 53 is 6 mm to 25 mm, and each straight pipe portion of the heat exchange tube 53 adjacent to each straight pipe portion 53b of each heat exchange tube 53. Since the distance D2 from 53b is 6 mm to 25 mm, the cooler 50 is not clogged by frost formation even when the evaporation temperature of the refrigerant is 0 ° C. or lower.

  Thus, according to the showcase of this embodiment, the longitudinal direction of the cross section is provided in the air circulation direction, and the refrigerant is bent so as to circulate in a meandering manner in a direction orthogonal to the air circulation direction. Since the cooler 50 is composed of a plurality of flat heat exchange tubes 53 arranged side by side and the first header 51 and the second header 52 to which both ends of each heat exchange tube 53 are connected, ventilation By bringing the air flowing through the passage 30 into contact with the outer surfaces of the plurality of heat exchange tubes 53 arranged in the air flow direction, the air flowing through the ventilation passage 30 is heat-exchanged with the refrigerant flowing through each heat exchange tube 53. It can cool to predetermined temperature, and it becomes possible to make small the size of the ventilation path 30 which is the installation space of the cooler 50. FIG. In addition, by bringing the air flowing through the ventilation path 30 into contact with the outer surface of each heat exchange tube 53, the air flowing through the ventilation path 30 can be heat exchanged with the refrigerant flowing through each heat exchange tube 53. It is possible to prevent clogging due to frosting of the vessel 50. In addition, since the refrigerant that exchanges heat with the air flowing through the ventilation path 30 is circulated through each heat exchange tube 53 that is provided to meander in a direction orthogonal to the air flow direction, the heat exchange tubes 53 are in contact with each other. The amount of air to be increased can be increased, and the number of parts and the number of processing steps can be reduced without arranging a plurality of heat exchange tubes in a direction orthogonal to the air flow direction.

  In addition, each heat exchange tube 53 is composed of a plurality of straight pipe portions 53b that are arranged in parallel to each other and formed in a straight line, and a bent portion 53c that communicates the adjacent straight pipe portions 53b. Since each heat exchange tube 53 is arranged so that the straight pipe portion 53b is positioned between the straight pipe portion 53b and the straight pipe portion 53b of the heat exchange tubes 53 adjacent to each other in the air flow direction, the air flowing through the ventilation path 30 As a result, the temperature boundary layer formed between the air and the outer surface of each heat exchange tube 53 can be prevented from becoming thick, and the cooling capacity can be improved. .

  Moreover, the connection part 53d extended in parallel with the straight pipe part 53b is provided in the both ends of each heat exchange tube 53, respectively, and it arrange | positions at the 1st header 51 and the 2nd header 52 in zigzag form in the air circulation direction, Since the plurality of tube connection holes 51 a and 52 a to which the connection portions 53 d of the heat exchange tubes 53 are connected are provided, the heat exchange tubes 53 having the same shape are connected to the tube connection holes 51 a of the first header 51 and the second header 52. , 52a, each straight tube portion 53b of each heat exchange tube 53 can be disposed between the straight tube portion 53b and the straight tube portion 53b of the heat exchange tube 53 adjacent in the air flow direction, Manufacturing costs can be reduced.

  Further, a straight pipe portion 53b that is provided so as to extend in a direction orthogonal to each straight pipe portion 53b of each heat exchange tube 53 and into which each straight pipe portion 53b can be inserted is formed, and is adjacent to the straight pipe portion 53b. And the spacer 54 for maintaining the distance between each heat exchange tube 53 and the adjacent heat exchange tube 53, the spacers 54 provide a space between the straight pipe portions 53 b of each heat exchange tube. Can be maintained, and the strength against deformation of the cooler 50 in the horizontal and vertical directions can be improved.

  In addition, since the distance D1 between the straight pipe portion 53b and the straight pipe portion 53b of each heat exchange tube 53 is 6 mm or more and 25 mm or less, the air flowing through the ventilation path 30 can be reliably cooled to a predetermined cooling temperature. It is possible to prevent clogging due to frost formation of the cooler 50.

  Further, since the distance D2 between the straight pipe portion 53b and the straight pipe portion 53b of the heat exchange tube 53 adjacent to each straight pipe portion 53b of each heat exchange tube 53 is set to 6 mm or more and 25 mm or less, the air passage 30 is circulated. The air to be cooled can be reliably cooled to a predetermined cooling temperature, and clogging due to frost formation of the cooler 50 can be prevented.

  Since the closing plates 65 for guiding the air are provided on the left and right side surfaces of the cooler 50 so that the air flowing through the ventilation path 30 contacts the heat exchange tubes 53, the air flowing through the ventilation path 30 can be reliably The heat exchange tubes 53 can be brought into contact with each other, and the cooling efficiency can be improved.

  12 to 16 show a second embodiment of the present invention. FIG. 12 is an overall perspective view of the cooler, FIG. 13 is a plan view of the cooler, and FIG. 14 is a view of the first and second headers. The figure which shows a tube connection hole, FIG.15 and FIG.16 is a top view of the cooler which shows the connection state of the heat exchange tube to the 1st header and the 2nd header. In addition, the same code | symbol is attached | subjected and shown to the component similar to the said embodiment.

  The cooler 70 of the showcase has a first header 71 and a second header 72 extending in the vertical direction (air flow direction) of the ventilation path 30 on the back side of the product storage unit 20, respectively, and both ends are first. And a plurality of heat exchange tubes 73 arranged in the vertical direction (air flow direction) of the ventilation path 30.

  As for the 1st header 71 and the 2nd header 72, the 1st header 71 is provided in the back side of the right side of the ventilation path 30, respectively, and the 2nd header 72 is the ventilation path 30 similarly to 1st Embodiment. Is provided on the left front side. A plurality of tube connection holes 71 a and 72 a are provided on the outer peripheral surface front side of the first header 71 and the outer peripheral surface rear side of the second header 72 so as to be aligned along the central axis direction. Both ends are connected to the tube connection holes 71a and 72a.

  Each heat exchange tube 73 includes a plurality of straight pipe portions 73b arranged in front and rear so as to be parallel to each other, a bent portion 73c communicating with the front and rear straight pipe portions 73b, and front and rear orthogonal to the straight pipe portion 73b. And connecting portions 73d provided at both ends so as to extend in directions opposite to each other. As shown in FIG. 15, each connection part 73d of each heat exchange tube 73 has one end side formed in a length dimension L1, and the other end side formed in a length dimension L2 (L1> L2). Here, the difference between the length dimension L1 and the length dimension L2 is half the distance between the straight tube portion 73b and the straight tube portion 73b of the heat exchange tube 73.

  Each heat exchange tube 73 alternately connects the connection part 73d on one end side to the tube connection hole 71a of the first header 71 and the tube connection hole 72a of the second header 72, and the connection part on the other end side. By alternately connecting 73d to the tube connection hole 72a of the second header 72 and the tube connection hole 71a of the first header 71 in the vertical direction, the straight pipe portions 73b are adjacent to each other in the vertical direction (air flow direction). The straight pipe parts 73b are positioned between the straight pipe parts 73b and 73b of the adjacent heat exchange tubes 73 without overlapping with the straight pipe parts 73b of the tubes 73 in the vertical direction (air flow direction). It has become.

  In the showcase configured as described above, as in the first embodiment, the air flowing through the ventilation path 30 flows while being in contact with the outer surfaces of the plurality of heat exchange tubes 73 arranged in the air flow direction. To do. Thereby, since the air which distribute | circulates a ventilation path is cooled by heat-exchanging with the refrigerant | coolant which distribute | circulates each heat exchange tube 73, it becomes possible to cool to predetermined temperature reliably.

  As described above, according to the showcase of the present embodiment, the heat exchange tubes 73 are provided at both end sides so as to be orthogonal to the straight pipe portion 73b and extend in opposite directions to each other. Connection portions 73d formed to have different lengths on the other end side are provided, and the connection portions 73d of the heat exchange tubes 73 are staggered in the air flow direction in the first header 71 and the second header 72. Since the heat exchange tube 73 having the same shape is connected to the first header 71 and the second header 72, the connection portion 73d and the connection portion 73d on the other end side are alternately connected to the tube connection holes 71a and 72a of the first header 71. By doing so, each straight pipe portion 73b of each heat exchange tube 73 can be disposed between the straight pipe portion 73b and the straight pipe portion 73b of the heat exchange tube 73 adjacent to each other in the air circulation direction, and the first The tube connection holes 71a and 72a of the header 71 and the second header 72 can be arranged side by side in the air flow direction, and the processing of the tube connection holes 71a and 72a of the first header 71 and the second header 72 is facilitated. Thus, it is possible to reduce the manufacturing cost.

  FIGS. 17 to 18 show a third embodiment of the present invention. FIG. 17 is a plan view of the cooler, and FIG. 18 is an exploded perspective view of the first header and the second header. In addition, the same code | symbol is attached | subjected and shown to the component similar to the said embodiment.

  The cooler 80 of the showcase includes a header body 81a, 82a in which an opening is provided in each of the first header 81 and the second header 82 in the vertical direction (air flow direction), and each heat exchange tube 53. Tube connection holes 81c and 82c to which the connection part 53d is connected are provided, and are constituted by closing plates 81b and 82b for closing the openings.

  As shown in the first embodiment, the closing plates 81b and 82b have tube connection holes 81c and 82c arranged in a staggered manner in the vertical direction (air flow direction), and header bodies 81a and 82a by brazing or soldering. The opening is closed.

  Thus, according to the showcase of this embodiment, the header main bodies 81a and 82a each provided with the opening part extended along an air circulation direction, and the tube connection holes 81c and 82c to which each heat exchange tube 53 is connected. Since the first header 81 and the second header 82 are constituted by the closing plates 81b and 82b for closing the openings, the tube connection holes 81c and 82c are formed in the flat closing plates 81b and 82b. The tube connection holes 81c and 82c can be processed more easily than opening the tube connection holes on the cylindrical peripheral surface.

  19 and 20 show a fourth embodiment of the present invention. FIG. 19 is a perspective view of the first header and the second header, and FIG. 20 is a side sectional view of the cooler. In addition, the same code | symbol is attached | subjected and shown to the component similar to the said embodiment.

  In the cooler 90 of this showcase, the first header 91 and the second header 92 are provided with one tube connection hole 91a, 92a provided in the vertical direction (air flow direction). The first header 91 and the second header 92 are connected to the connection portions 73d of the heat exchange tubes 73 shown in the second embodiment by being stacked in the vertical direction (air flow direction) and brazed or soldered. Thus, the heat exchange tubes 73 are connected to each other, and the gaps between the tube connection holes 91a and 92a and the heat exchange tubes 73 are closed. At this time, the distance D2 between each straight pipe part 73b of the heat exchange tube 73 and each straight pipe part 73b of the adjacent heat exchange tube 73 is 6 mm or more and 25 mm or less.

  Thus, according to the showcase of the present embodiment, the first header 91 and the second header 92 are provided so as to extend along the air flow direction, and the connection portions 73d of the heat exchange tubes 73 are connected to the air. Since one tube connection hole 91a, 92a that can be stacked and connected in the flow direction is provided, each heat exchange tube is provided in one tube connection hole 91a, 92a provided in the first header 91 and the second header 92. 73 can be stacked and connected, and the opening operation of the tube connection hole 91a becomes easy, and the connecting operation of each heat exchange tube 73 becomes easy.

  In the first to fourth embodiments, the heat exchange between the refrigerant and the air flowing through the ventilation path 30 is performed only by the plurality of heat exchange tubes 53 and 73. Fins may be provided between the straight pipe portions 53b and 73b of the 53 and 73 and the straight pipe portions 53b and 73b. In this case, when the distance between the fins is 6 mm or more and 25 mm or less, it is possible to improve the cooling capacity and prevent clogging due to frost formation. In addition, since fins are fixed by brazing or soldering between the straight pipe portions 53b and 73b and the straight pipe portions 53b and 73b of the heat exchange tubes 53 and 73, a spacer 54 is required. The strength against deformation of the heat exchange tubes 53 and 73 is maintained.

1 is an overall perspective view of a showcase showing a first embodiment of the present invention. Side cross-sectional view of showcase Schematic configuration diagram of refrigerant circuit Overall perspective view of cooler Top view of cooler Side view of cooler Sectional view of the first header Perspective view of main part of heat exchange tube Overall perspective view of spacer Cross-sectional plan view of the main part of the showcase showing how the cooler is installed Side sectional view of the main part of the showcase showing how the cooler is installed The whole perspective view of the cooler showing the 2nd embodiment of the present invention. Top view of cooler The figure which shows the tube connection hole of the 1st and 2nd header The top view of the cooler which shows the connection state of the heat exchange tube to the 1st header and the 2nd header The top view of the cooler which shows the connection state of the heat exchange tube to the 1st header and the 2nd header The top view of the cooler which shows the 3rd Embodiment of this invention Exploded perspective view of the first header and the second header The perspective view of the 1st header which shows the 4th Embodiment of this invention, and a 2nd header Side view of cooler

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Showcase main body, 20 ... Merchandise storage part, 30 ... Ventilation path, 50 ... Cooler, 51 ... 1st header, 51a ... Tube connection hole, 52 ... 2nd header, 52a ... Tube connection hole, 53 ... Heat exchange tube, 53b ... straight pipe portion, 53c ... bent portion, 53d ... connection portion, 54 ... spacer, 60 ... mounting member, 61 ... fixing plate, 62 ... holding plate, 63 ... connecting screw, 64 ... fixing screw, 65 ... Guide plate, 70 ... Cooler, 71 ... First header, 71a ... Tube connection hole, 72 ... Second header, 72a ... Tube connection hole, 73 ... Heat exchange tube, 73b ... Straight pipe part, 73c ... Bending part, 73d ... connection part, 80 ... cooler, 81 ... first header, 81a ... header body, 81b ... closing plate, 81c ... tube connection hole, 82 ... second header, 82a ... header body, 82b ... Closure plate, 82c Tube connecting hole, 90 ... cooler, 91 ... first header, 91a ... tube connecting hole, 92 ... second header, 92a ... tube connecting holes.

Claims (10)

A showcase body having a product storage section and a ventilation path for circulating air in the product storage section, and a cooler for cooling the air flowing through the ventilation path by exchanging heat between the air flowing through the ventilation path and the refrigerant. In the showcase
The cooler is provided such that the longitudinal direction of the cross section is directed to the air flow direction, the refrigerant is bent so as to circulate while meandering in a direction perpendicular to the air flow direction, and a plurality of flats arranged side by side in the air flow direction. A showcase comprising: a heat-exchange tube having a shape, and a first header and a second header to which both ends of each heat-exchange tube are respectively connected. Each of the heat exchange tubes has a plurality of straight pipe portions arranged so as to be parallel to each other, and a bent portion communicating with the adjacent straight pipe portions,
The showcase according to claim 1, wherein the heat exchange tubes are arranged so that the straight pipe portions are positioned between the straight pipe portions of the heat exchange tubes adjacent in the air flow direction. Each end of each heat exchange tube is provided with a connecting portion extending parallel to the straight pipe portion,
Each show part of each heat exchange tube was connected to the 1st header and the 2nd header in the air circulation direction in the zigzag form. The showcase according to claim 2 characterized by things. Connections that are provided on both ends of each heat exchange tube so as to be orthogonal to the straight pipe portion and extend in opposite directions to each other, and have different lengths on one end side and on the other end side. Part is provided,
The showcase according to claim 2, wherein each connection portion of each heat exchange tube is alternately connected to the first header and the second header in the air flow direction. Each of the first header and the second header is provided with a header body provided with an opening extending along the air flow direction, and a tube connection hole to which a connection portion of each heat exchange tube is connected. The showcase according to claim 3 or 4, wherein the showcase is configured by a closing plate that closes the door. The first header and the second header are provided so as to extend along the air flow direction, and one tube connection hole that can be connected by stacking connection portions of the heat exchange tubes in the air flow direction is provided. The showcase according to claim 4 or 5, characterized in that. Slits into which the straight pipe portions of the heat exchange tubes can be inserted are provided, and a spacer is provided to maintain a distance between the straight pipe portions of each heat exchange tube and a distance between adjacent heat exchange tubes. The showcase according to any one of claims 1 to 5, wherein: The showcase according to any one of claims 1 to 7, wherein a distance between each straight pipe portion of each heat exchange tube is 6 mm or more and 25 mm or less. The distance between each straight pipe portion of the heat exchange tube and each straight pipe portion of the adjacent heat exchange tube is set to 6 mm or more and 25 mm or less. Showcase. The guide plate which guides the air which distribute | circulates a ventilation path is provided in the outer peripheral part of the said cooler so that the air which distribute | circulates an ventilation path may contact each heat exchange tube. The showcase according to any one of the items.

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