JP2007139278A - Heat exchanger, and cold instrument using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger, and a cold instrument using it capable of thinning a whole of the heat exchanger, and preventing clogging due to frost formation. <P>SOLUTION: Since a heat exchange part 12 provided between headers 10 carries out heat exchange with external air flowing in a longitudinal direction of the headers 10, the whole of the heat exchanger can be thinned, and when it is arranged in a back face side ventilation passage of a showcase for example, an overall depth of the showcase can be reduced. In such a case, since the heat exchange part 12 is formed by only a heat exchange tube 11, there is no clogging of built-up frost due to passing of air through narrow spaces between heat transfer fins as in a conventional one, and it can be used as an evaporator for not only a refrigeration showcase, but also for a freezer showcase. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger used in a cooling / heating apparatus such as a refrigeration / refrigeration showcase or an air conditioner, and a cooling / heating apparatus using the heat exchanger.

  Conventionally, as a showcase used for display of frozen or refrigerated products in a store such as a convenience store, it is formed along a showcase body with an open front, and a top surface side, a back surface side, and a bottom surface side in the showcase body. The air that has been sucked into the ventilation path from the lower end side of the front opening of the showcase body is cooled by the evaporator, and the upper end of the front opening is provided. In general, the liquid is discharged from the side.

  The heat exchanger used in the showcase evaporator includes a refrigerant circulation tube bent in a serpentine shape and a plurality of heat transfer fins spaced from each other so as to come into contact with the tube. Are known (for example, see FIG. 1 of Patent Document 1).

Also, as another heat exchanger, a pair of hollow cylindrical headers arranged at intervals in a direction orthogonal to the longitudinal direction, and arranged between the headers at intervals in the longitudinal direction of the headers A plurality of flat tubes and a plurality of heat transfer fins spaced from each other so as to be in contact with each tube, and each tube having both ends connected to each header are known. (For example, refer to FIG. 2 of Patent Document 1).
JP 2005-114345 A

  However, because of the structure of the former heat exchanger, the fin area has to be increased in order to improve the heat exchange efficiency, and the heat exchanger as a whole becomes larger by that amount. When arranged on the road, there is a problem of increasing the depth dimension of the showcase. In the latter heat exchanger, heat can be exchanged efficiently with a large number of tubes and fins between them, so that the entire heat exchanger can be thinned and placed in the ventilation path on the back side of the showcase. However, the occupied space can be reduced, but air circulates in a narrow space between the flat tube and the fins, so clogging due to frost formation is likely to occur and it is not suitable for a freezer showcase. there were.

  The present invention has been made in view of the above-mentioned problems, and an object of the present invention is a heat exchanger capable of reducing the thickness of the entire heat exchanger and causing no clogging due to frost formation. The object is to provide a cooling / heating apparatus using the above.

  In order to achieve the above object, the present invention provides a pair of headers that are spaced apart from each other in a direction orthogonal to the longitudinal direction, and a plurality of headers that are spaced from each other in the longitudinal direction of the header. A heat exchanger that has a flat heat exchange tube and connects both ends of each heat exchange tube to each header. Heat exchange is possible between the headers and the external fluid that flows in the longitudinal direction of the header. A heat exchange part is provided, and the heat exchange part is formed only by each heat exchange tube.

  Thereby, since the heat exchange part provided between each header exchanges heat with the external air which distribute | circulates to the longitudinal direction of a header, the whole heat exchanger can be reduced in thickness. Moreover, since the heat exchange part is formed only by each heat exchange tube, clogging of frost due to air flowing in a narrow space between the heat transfer fins as in the conventional case does not occur. .

  According to the present invention, since the entire heat exchanger can be reduced in thickness, the depth dimension of the showcase can be reduced, for example, when the heat exchanger is disposed in the rear-side air passage of the showcase as a cooling device. In this case, since there is no clogging of frost due to air flowing through a narrow space between the heat transfer fins as in the conventional case, not only as a refrigerator showcase but also as an evaporator for a freezer showcase. Can also be used.

  1 to 5 show a first embodiment of the present invention. FIG. 1 is an overall perspective view of a heat exchanger, FIG. 2 is a side sectional view of a showcase using the heat exchanger of the present invention, and FIG. 3 is a partial cross-sectional perspective view of the heat exchange tube, FIG. 4 is an exploded side cross-sectional view of the main part of the heat exchanger, and FIG. 5 is a partial cross-sectional side view of the main part.

  The showcase shown in FIG. 2 is arranged in the airflow path 2, the airflow path 2 formed along the upper surface side, the back surface side, and the bottom surface side in the showcase main body 1. The evaporator 3 and the blower 4 have a well-known configuration. The air sucked into the ventilation path 2 from the lower end side of the front opening portion of the showcase body 1 is cooled by the evaporator 3, and the upper end of the front opening portion is cooled. By discharging from the side, an air curtain is formed in the front opening.

  The heat exchanger of the present invention is used as, for example, the evaporator 3 of the showcase, and includes a pair of headers 10 arranged at intervals in a direction orthogonal to the longitudinal direction, and a header between each header 10. 10 and a plurality of flat heat exchange tubes 11 arranged at intervals in the longitudinal direction.

  Each header 10 is made of a hollow cylindrical aluminum alloy extending in the axial direction (longitudinal direction), and a plurality of insertion holes 10a into which end portions of the respective heat exchange tubes 11 are inserted are axially arranged in the header 10 with respect to each other. Are provided at intervals. In this case, each insertion hole 10 a is formed in a long hole shape so as to correspond to the cross-sectional shape (flat shape) of the heat exchange tube 11, and is provided so that its longitudinal direction extends in the axial direction of the header 10.

  Each heat exchange tube 11 is made of an aluminum alloy extruded product formed in a flat shape, and a plurality of refrigerant passages 11 a are provided in the longitudinal direction of the cross section of the heat exchange tube 11 inside thereof. Each heat exchange tube 11 is disposed such that the longitudinal direction of the cross section extends along the longitudinal direction of each header 10. In addition, although the refrigerant passage 11a has a quadrangular cross section in the heat exchange tube 11, the refrigerant passage has a circular cross section, or a partition member that is bent in a corrugated manner in a refrigerant flow passage that is wide in the longitudinal direction of the cross section. You may use what inserted.

  Both ends of each heat exchange tube 11 are inserted into the insertion holes 10a of each header 10 and joined to each header 10 by brazing. Moreover, between each header 10, the heat exchange part 12 which can be heat-exchanged with the external fluid (white arrow in the figure) which distribute | circulates in the longitudinal direction of the header 10 is provided, and the heat exchange part 12 is only each heat exchange tube 11. Is formed by.

  The heat exchanger configured as described above is arranged in the rear side air passage 2 as the evaporator 3 of the showcase, and the refrigerant flowing through each heat exchange tube 11 and the air flowing through the air passage 2 are used. Exchange heat. At that time, since the air in the ventilation path 2 flows around the heat exchanger 10 in the longitudinal direction of the header 10, the space occupied by the heat exchanger (evaporator 3) in the ventilation path 2 is the depth of the ventilation path 2. It does not grow in the direction. Moreover, since the air in the ventilation path 2 is heat-exchanged only with each heat exchange tube 11, it does not distribute | circulate through the narrow space between the fins for heat transfer conventionally, and frost formation does not occur.

  As described above, according to the present embodiment, the heat exchanger 12 provided between the headers 10 is exchanged with the external air flowing in the longitudinal direction of the headers 10, so that the entire heat exchanger is thinned. The depth dimension of the showcase can be reduced when it is arranged in the rear side ventilation path 2 of the showcase. In this case, since the heat exchanging portion 12 is formed only by the heat exchanging tubes 11, clogging of frost caused by air flowing in a narrow space between the heat transfer fins as in the conventional case occurs. Of course, it can be used not only as a refrigerated showcase but also as an evaporator for a frozen showcase. Moreover, since it can manufacture only from a pair of header 10 and the some heat exchange tube 11, while being able to reduce a number of parts, for example, diverting the part of the heat exchanger used for the air conditioning apparatus of a motor vehicle. The manufacturing cost can be reduced.

  In the above embodiment, the heat exchange tubes 11 are arranged one by one in the longitudinal direction of the header 10, but a plurality of heat exchange tubes 11 are arranged in a direction orthogonal to the flow direction of the external fluid. Then, the heat exchange capability can be improved. For example, as shown in FIG. 6, the insertion holes 10b may be provided at a plurality of locations in the circumferential direction of the header 10, and the plurality of heat exchange tubes 11 may be connected to the respective insertion holes 10b. Moreover, as shown in FIG. 7, the header 10 may be provided with a wide insertion hole 10c in the circumferential direction, and a plurality of heat exchange tubes 11 may be connected to the insertion hole 10b. In this case, a gap is provided between the heat exchange tubes 11 by bending both end sides of the other heat exchange tubes 11 excluding the central heat exchange tube 11 in the thickness direction.

  8 and 9 show a second embodiment of the present invention. FIG. 8 is an overall perspective view of the heat exchanger, and FIG. 9 is a partial sectional side view of the main part thereof. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.

  In the heat exchanger of this embodiment, twist portions 13a twisted with respect to the center side are provided on both ends of each heat exchange tube 13, and the longitudinal direction of the cross section of the portion excluding the twist portions 13a on both ends is the length of each header 10. It is formed so as to form a predetermined inclination angle θ (for example, 30 °) smaller than 45 ° with respect to the direction. In this case, the heat exchange tubes 13 are alternately arranged in the longitudinal direction of the header 10 so that the inclination directions are opposite to each other.

  That is, the inclination of each heat exchange tube 13 can increase the flow resistance of the air flowing along the heat exchange part 12 and can increase the contact time with the heat exchange tube 13, thereby improving the heat exchange efficiency. it can.

  In this case, since the heat exchange tubes 13 are alternately arranged so that the inclination directions are opposite to each other, a uniform air flow can be formed on both sides in the thickness direction of the heat exchange section 12, and the heat exchange efficiency can be improved. It can be improved further.

  Furthermore, since the inclination angle θ of each heat exchange tube 13 is smaller than 45 °, the flow resistance of the air flowing along the heat exchange part 12 is not increased unnecessarily, and the wind speed can be prevented from being lowered. .

  In addition, since the heat exchange tubes 13 are inclined by providing the twisted portions 13a twisted with respect to the center side at both ends of the heat exchange tubes 13, each heat exchange tube as in the first embodiment. The header 10 of the heat exchanger comprised so that 11 may not be inclined can be used, and common use of components can be achieved. In addition, you may make it use the heat exchange tube 11 which does not have a twist part by providing the insertion hole (not shown) in the header 10 which inclined.

  10 and 11 show a third embodiment of the present invention. FIG. 10 is an overall perspective view of the heat exchanger, and FIG. 11 is a partial sectional side view of the main part thereof. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.

  In the heat exchanger according to the present embodiment, a plurality of heat exchange tubes 11 provided so that a cross-sectional longitudinal direction extends along the longitudinal direction of each header 10 and a cross-sectional longitudinal direction of a portion excluding both end sides of each header 10 A plurality of heat exchange tubes 13 formed so as to form a predetermined inclination angle with respect to the longitudinal direction, and the heat exchange tubes 11 and 13 are alternately arranged in the longitudinal direction of the header 10.

  Thereby, by the inclination of the heat exchange tube 13, the flow resistance of the air flowing along the heat exchange part 12 can be increased, the contact time with the heat exchange tube 13 can be lengthened, and the heat exchange efficiency can be improved. it can. In that case, since the heat exchange tube 11 which does not have an inclination is arrange | positioned between each heat exchange tube 13 inclined, the flow of the air which flows along the heat exchange part 12 can be made smooth, and wind speed It is extremely advantageous for preventing the decrease in the thickness.

  12 and 13 show a fourth embodiment of the present invention. FIG. 12 is an overall perspective view of the heat exchanger, and FIG. 13 is a partial sectional side view of the main part thereof. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.

  In the heat exchanger according to the present embodiment, the pair of flat headers 14 that are wide in the direction orthogonal to the flow direction of the external fluid, and the cross-sectional longitudinal direction of the portion excluding both ends are in the longitudinal direction of each header 10 It comprises a plurality of heat exchange tubes 13 formed so as to form a predetermined inclination angle, and each heat exchange tube 13 is arranged in a plurality of rows in a direction orthogonal to the flow direction of the external fluid.

  Thereby, since the heat exchange part 12 is formed with the heat exchange tube 13 of multiple rows | lines, heat exchange capability can be improved. In this case, since each header 14 is formed in a flat shape having a wide width in a direction orthogonal to the flow direction of the external fluid, the entire heat exchanger is arranged in the width direction even when the heat exchange tubes 13 are arranged in a plurality of rows. There is an advantage that the size is not increased.

  As shown in FIG. 14, the connection positions of the heat exchange tubes 13 to the headers 14 are arranged in a staggered manner, so that the heat exchange tubes 13 are arranged in the longitudinal direction of the headers 14. You may comprise so that it may slip | deviate.

  FIGS. 15 to 17 show a fifth embodiment of the present invention. FIG. 15 is an overall perspective view of a heat exchanger, FIG. 16 is a schematic configuration diagram in which heat exchange units are connected in parallel, and FIG. It is the schematic block diagram which connected the unit in series. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to 1st Embodiment.

  The heat exchanger of the present embodiment includes a plurality of heat exchange units 20 including a pair of headers 10 and a plurality of heat exchange tubes 13, and each heat exchange unit 20 is arranged in a direction orthogonal to the flow direction of the external fluid. . In this case, the heat exchange units 20 are connected in parallel to each other as shown in FIG. 16, or are connected in series to each other as shown in FIG.

  Thereby, since a heat exchanger can be comprised using arbitrary number of heat exchange units 20, many types of heat exchangers can be manufactured with a common component, and reduction of manufacturing cost can be aimed at. it can.

  Further, when the heat exchanger is used as the evaporator 3 of the refrigeration circuit of the showcase, if the heat exchange units 20 are provided in the number corresponding to the refrigeration capacity, the heat exchange is performed even when manufacturing the showcase having different cooling capacities. The unit 20 can be used as a common part, and the production efficiency can be improved.

  In the above embodiment, the heat exchanger used for the showcase is shown, but it can also be used for other cooling and heating equipment such as an air conditioner.

The whole heat exchanger perspective view showing the 1st embodiment of the present invention. Side sectional view of a showcase using the heat exchanger of the present invention Partial cross-sectional perspective view of heat exchange tube Exploded side sectional view of the main part of the heat exchanger Partial cross-sectional side view of main part of heat exchanger The top view of the heat exchanger which shows the modification of 1st Embodiment The top view of the heat exchanger which shows the other modification of 1st Embodiment Whole perspective view of the heat exchanger which shows the 2nd Embodiment of this invention Partial cross-sectional side view of main part of heat exchanger Whole perspective view of the heat exchanger which shows the 3rd Embodiment of this invention Partial cross-sectional side view of main part of heat exchanger Whole perspective view of the heat exchanger which shows the 3rd Embodiment of this invention Partial cross-sectional side view of main part of heat exchanger The principal part partial cross section side view of the heat exchanger which shows the modification of 3rd Embodiment Overall perspective view of heat exchanger Schematic configuration diagram with heat exchange units connected in parallel Schematic configuration diagram with heat exchange units connected in series

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Header, 11 ... Heat exchange tube, 12 ... Heat exchange part, 13 ... Heat exchange tube, 13a ... Twist part, 14 ... Header, 20 ... Heat exchange unit

Claims (12)

A pair of headers arranged at intervals in a direction perpendicular to the longitudinal direction, and a plurality of flat heat exchange tubes arranged between the headers at intervals in the longitudinal direction of the headers, In a heat exchanger in which both ends of the heat exchange tube are connected to each header,
A heat exchanger in which a heat exchanging portion capable of exchanging heat with an external fluid flowing in the longitudinal direction of the header is provided between the headers, and the heat exchanging portion is formed only by the heat exchanging tubes. The heat exchanger according to claim 1, wherein each of the heat exchange tubes is provided so that a longitudinal direction of the cross section extends along a longitudinal direction of each header. 2. The heat exchanger according to claim 1, wherein a portion excluding both ends of each heat exchange tube is formed such that a longitudinal direction of the cross section forms a predetermined inclination angle with respect to a longitudinal direction of each header. A plurality of heat exchange tubes formed so that the longitudinal direction of the cross section of the portion excluding both end sides forms a predetermined inclination angle with respect to the longitudinal direction of each header are alternately arranged in the longitudinal direction of the header so that the inclination directions are opposite to each other. The heat exchanger according to claim 1, wherein the heat exchanger is disposed in The heat exchange tube provided so that the cross-sectional longitudinal direction extends along the longitudinal direction of each header, and the cross-sectional longitudinal direction of the portion excluding both ends form a predetermined inclination angle with respect to the longitudinal direction of each header The heat exchanger according to claim 1, wherein the heat exchange tubes are alternately arranged in the longitudinal direction of the header. The heat exchanger according to claim 3, 4 or 5, wherein the inclination angle is smaller than 45 °. The heat exchanger according to claim 3, 4, 5, or 6, wherein a twisted portion twisted with respect to the center side is provided at both ends of the heat exchange tube. The heat exchanger according to claim 1, 2, 3, 4, 5, 6 or 7, wherein a plurality of the heat exchange tubes are arranged in a direction orthogonal to a flow direction of the external fluid. The heat exchanger according to claim 8, wherein each header is formed in a flat shape having a wide width in a direction orthogonal to a flow direction of the external fluid. The heat exchanger according to claim 8 or 9, wherein the connection positions of the heat exchange tubes to the headers are arranged in a staggered manner. 1, 2, 3, 4, 5, 6, 7 characterized in that a plurality of heat exchange units comprising a pair of headers and a plurality of heat exchange tubes are provided, and the headers of each heat exchange unit are connected in parallel or in series with each other. , 8, 9 or 10. The heat exchanger according to claim 11 is provided as an evaporator of a refrigeration circuit,
The cooling / heating apparatus, wherein the number of the heat exchange units corresponding to the capacity of the refrigeration circuit is provided.

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