JP4961196B2 - Showcase - Google Patents

Description

  The present invention relates to a showcase for storing food and the like in a fresh state for a long time when the food and the like are sold at a store.

  In supermarkets and convenience stores, you can find a showcase with an open front so that the buyer can easily pick up the food sold (eg, meat, fresh fish, frozen food, ice cream, etc.). . In such a showcase, a cooler is arranged, and in this cooler, a plurality of hairpins (refrigerant tubes) penetrate through a plurality of fins juxtaposed with a gap therebetween, so-called fin and There is a tube type. In this cooler, the air in the vicinity of the fins is cooled by the heat absorption of the refrigerant flowing in the refrigerant pipe formed by the hairpin, and the cooling air is sent to the storage room where the food etc. is displayed, thereby freezing the food or the like. It can be cooled (see, for example, Patent Document 1).

The hairpin described above is formed by bending a refrigerant pipe into a U shape, and has straight pipe portions extending in parallel with each other at a predetermined interval (pitch) so that the straight pipe portions penetrate through a plurality of fins. It has become. On the other hand, a plurality of holes are formed in the plurality of fins, and a straight tube portion of the hairpin is inserted into the holes. The plurality of holes vary depending on the size, shape, etc. of the cooler, but there are, for example, those arranged in three rows along the flow direction of the air to be cooled. Further, the pitch between the adjacent holes is the same as the pitch of the straight pipe portion.
JP-A-11-94442

  In the case of an open showcase having an open front side, outside air can freely enter the storage chamber. Therefore, moisture contained in the outside air is cooled in contact with the fins or hairpins, and frost may be formed. In particular, when the straight tube portions of a plurality of hairpins are densely arranged in a part, the gap between the portions becomes small, the air passing through the gap portion is overcooled, and frost is easily formed.

  Thus, in order to arrange the straight tube portion of the hairpin so as not to be partly concentrated, among the three rows in which the plurality of hole portions are arranged, in the row adjacent to each other, rather than arranging the hairpin in the same row. It is preferable to attach a hairpin so as to straddle. However, when hairpins are attached to the three rows of holes, it is impossible to dispose only one row so as to straddle the next row, and it is necessary to arrange hairpins in the same row for this one row. Therefore, straight pipe portions are densely arranged near the hairpins arranged in the same row. Therefore, the flow of air to be cooled may be hindered by frost adhering to this portion.

  The present invention has been made in view of the above-described circumstances, and includes a cooler in which refrigerant pipes are not arranged densely even when the number of holes is three. The purpose is to provide a showcase.

In the present invention, a fin-and-tube type cooler in which a plurality of holes are respectively formed in a plurality of flat fins, and a plurality of hairpins in which refrigerant pipes are bent in a U shape are inserted into the holes. A showcase for sending the air cooled by the cooler to the vicinity of the display shelf, wherein the plurality of holes are arranged in three rows along the flow direction of the air to be cooled and are adjacent to the three holes. There were arranged so as to constitute the vertices of a substantially equilateral triangle, the plurality of hairpin, the first hairpin pitch of the two straight pipe portions in the U-shape is equal to the length of one side of the equilateral triangle, the first twice the pitch of 1 hairpin constituted by a second hairpin to Yes, after the refrigerant pipe diagonally adjacent three rows by first hairpin connecting body twice, at both ends except for the columns in the ones of the three rows Diagonal refrigerant pipe with second hairpin The refrigerant pipes are arranged in a flow direction of the air to be cooled while taking a zigzag path so as to form one refrigerant pipe .
According to this structure, a 1st hairpin and a 2nd hairpin can always be arrange | positioned so that it may straddle another row.

The plurality of holes are arranged in a plurality of rows along a straight line that forms an angle of about 60 degrees with respect to the flow direction of the air to be cooled, and is viewed from the base end side of the straight line. In addition, the first hairpin and the second hairpin can be attached so that straight tube portions in the U-shape of the first hairpin and the second hairpin are scattered every other row.
According to this configuration, a gap in the straight tube portion of the hairpin is secured, and a plurality of refrigerant tubes can be prevented from being densely arranged in a part.

According to the present invention, a fin-and-tube type cooling in which a plurality of holes are formed in a plurality of flat fins, and a plurality of hairpins in which a refrigerant tube is bent in a U shape is inserted into the holes. A showcase that includes a cooler and sends the air cooled by the cooler to the vicinity of the display shelf,
The plurality of holes are arranged in three rows along the flow direction of the air to be cooled, and the arbitrarily selected three adjacent holes form the apex of a substantially equilateral triangle, respectively. A plurality of hairpins, the first hairpin attached to straddle the adjacent row of holes, the pitch of the two straight tube portions in the U-shape is equal to the length of one side of the equilateral triangle, Since it has a pitch twice that of one hairpin and is composed of a second hairpin that is attached across both ends of the three rows except for the center row, the first hairpin and the second hairpin are always other It can arrange | position so that a row may be straddled. Therefore, compared with the case where hairpins are arranged in the same row, straight tube portions of a plurality of hairpins are not arranged densely in a part. As a result, it is possible to prevent frost from forming on the cooler, thereby preventing the flow of air cooled by the frost from being obstructed and providing a showcase that realizes stable cooling performance.

  Hereinafter, a showcase according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a showcase according to an embodiment of the present invention as viewed from the front diagonal right side. FIG. 2 is a front view of the showcase, with the inner wall portion partially cut away. FIG. 3 is a side sectional view taken along line AA in FIG. Note that the directions used for explanation in the following embodiment are based on FIG. 2 with the vertical direction of the paper as the vertical direction of the showcase, the horizontal direction of the paper as the horizontal direction of the showcase, and the depth direction of the paper as the showcase. The front-rear direction.

  As shown in FIG. 1, the showcase 1 described in this embodiment is of a multistage open type with the front surface opened. As shown in FIGS. 1 to 3 (particularly FIG. 3), the showcase 1 includes a showcase body 3 constituting the outside, and a substantially U-shaped heat insulating wall provided inside the showcase body 3. 4, an inner wall portion 5 provided inside the U-shape of the heat insulating wall portion 4, and four display shelves 6 attached to the inner wall portion 5.

As shown in FIG. 3, a duct 7 through which cool air is sent is formed between the heat insulating wall 4 and the inner wall 5, and a cooler for cooling the air is formed inside the duct 7. 8 (evaporator) and a blower 9 disposed below the cooler 8 and sending air (cold air) upward toward the cooler 8 are disposed.
Further, as shown in FIG. 3, a cold air outlet 10 connected to the upper end portion of the duct 7 is formed on the upper side of the showcase 1, while the lower end portion of the duct 7 is formed on the lower side. A connected cold air inlet 11 is formed. Thereby, after the air sent by the blower 9 is cooled by the cooler 8, it is sent to the upper side and discharged from the cold air outlet 10 to the vicinity of the display shelf 6, while the cold air near the display shelf 6 is The air is sucked into the duct 7 from the cold air inlet 11 and is sent again to the cooler 8 by the blower 9. This air circulation flow is indicated by an arrow 12 in FIG.

  Further, as shown in FIG. 3, a compressor 14 and a heat exchanger 15 that are connected to the lower part of the showcase 1 and below the heat insulating wall 4 via a cooler 8 and a refrigerant pipe 13. Etc. are arranged, and a refrigerant circuit is constituted by these. The heat exchanger 15 is cooled by outside air taken in from the intake holes 16a of the front panel 16 shown in FIGS. As shown in FIG. 3, the air after heat exchange passes between the showcase body 3 and the heat insulating wall 4 and is discharged to the outside from the upper discharge port 17. This external air flow is indicated by an arrow 18 in FIG.

In the refrigerant circuit in the present embodiment configured by the cooler 8, the compressor 14, the heat exchanger 15 and the like, CO ₂ refrigerant is used as the refrigerant. The refrigerant pipe 13 through which the CO ₂ refrigerant is sent has a pipe diameter smaller than that of a refrigerant pipe used in a circuit using a general refrigerant (for example, CCl ₂ F ₂ or the like). In addition, since the refrigerant circuit in a present Example is the same as that of the conventional refrigerant circuit, detailed description is abbreviate | omitted.

  FIG. 4 is a front view showing the cooler 8 as a single unit. A cover 20 is attached to the front surface of the cooler 8. Below the cover 20, the refrigerant pipe 13 drawn from below is drawn in a meandering manner from side to side, and the drawn refrigerant pipe 13 is fixed by a fixing bracket 21. Further, the refrigerant pipe 13 is piped to a cooling unit 22 covered with a cover 20.

FIG. 5 is an enlarged front view of the cooling unit 22 with the front cover of the cooler 8 of FIG. 4 removed. FIG. 6 is an enlarged view of a portion B shown in FIG.
As shown in FIG. 5, the cooling unit 22 includes a plurality of fins 30, a refrigerant pipe 31 that passes through the plurality of fins 30, and side metal fittings 32 that form both side portions. It is a tube type heat exchanger.

Refrigerant pipe 31, as shown in FIG. 5, a plurality of elongated U-shaped tube (first hairpin 31a, second hairpin 31b), CO ₂ by connecting a plurality of short U-shaped tubes 31c, and 31d by welding A refrigerant flow path is formed. In the second hairpin 31b, the interval (pitch) of the U-shaped straight tube portion T is doubled compared to the first hairpin 31a. By using the first hairpin 31a and the second hairpin 31b, the refrigerant tube 31 can be configured to penetrate the plurality of fins 30 while repeating meandering in the left-right direction Y as shown in FIG. it can. The refrigerant pipe 31 is connected to the refrigerant pipe 13 at the inflow connection port 34a, and the CO ₂ refrigerant is sent into the refrigerant pipe 31. The CO ₂ refrigerant that has passed through the refrigerant pipe 31 flows out of a refrigerant pipe (not shown) connected to the outflow connection port 34b. The pipe diameter of the refrigerant pipe 31 is the same as the pipe diameter of the refrigerant pipe 13 and is smaller than the refrigerant pipe used in a circuit using a general refrigerant (for example, CCl ₂ F ₂ etc.). Is used.

  Each of the plurality of fins 30 has a flat plate shape, and two types of long fins 30a and short fins 30b are used as shown in FIG. The long fin 30a has a length approximately twice that of the short fin 30b in the vertical direction X in which the air to be cooled is sent. The long fins 30 a and the short fins 30 b are arranged substantially in parallel along the vertical direction X, and are alternately arranged at intervals in the horizontal direction Y of the showcase 1. That is, the short fin 30b is arranged next to the long fin 30a, and the long fin 30a is arranged next to the short fin 30b.

Further, the long fins 30a and the short fins 30b are arranged with their upper ends aligned. That is, in the upper portion 33a of the cooling unit 22 (the portion above the center line 33 in the vertical length of the long fin 30a shown in FIG. 6 and the downstream portion in the air flow direction) Since the fins 30a and the short fins 30b are alternately arranged, the fin pitch P1 is reduced, while the lower part 33b of the cooling unit 22 (the part below the line 33 shown in FIG. In the upstream portion in the flow direction, only the long fins 30a are arranged, so that the fin pitch P2 increases (P2 = 2 × P1).
In addition, the long fin 30a and the short fin 30b are arrange | positioned uniformly by the fin pitch P1 between the side surface metal fittings 32, and a part of fin 30 was abbreviate | omitted and described in FIG.

FIG. 7 is a left side view of the cooling unit 22 shown in FIG.
The side metal fitting 32 includes a U-shaped tube mounting surface portion 32 b and a side surface portion 32 c that rises from the edge of the U-shaped tube mounting surface 32 b toward the outside of the cooling unit 22. A plurality of hole portions 40 into which the first hairpin 31a and the second hairpin 31b are inserted are formed in the U-shaped tube attachment surface portion 32b. The plurality of hole portions 40 are arranged in three rows (left row 41, center row 42, right row 43) in the vertical direction X, and the inserted first hairpin 31a and second hairpin 31b and U-shaped tube attachment The surface portion 32c is fixed by welding. Further, the plurality of hole portions 40 are formed such that arbitrarily selected three mutually adjacent hole portions (for example, indicated by reference numerals S1, S2, and S3 in FIG. 7) constitute the vertices of a substantially equilateral triangle. It arrange | positions and the hole pitch between each adjacent hole part 40 is constant. This hole pitch coincides with the interval (pitch) of the U-shaped straight tube portion T of the first hairpin 31a described above, and the pitch twice this hole pitch is the U-shaped straight tube of the second hairpin 31b. It corresponds to the interval (pitch) of the portion T.

  The long fin 30a and the short fin 30b have substantially the same shape as the side metal fitting 32, and a plurality of the long fin 30a and the short fin 30b are provided at positions corresponding to the holes 40 of the side metal fitting 32. The hole 35 (see FIG. 8A and FIG. 8B for details) is formed, and the first hairpin 31a and the second hairpin 31b are inserted into the hole 35.

  As shown in FIG. 7, the first hairpin 31a is attached so as to straddle adjacent rows (for example, the row 41 and the row 42, or the row 42 and the row 43), and is attached on the same row. Absent. Moreover, the 2nd hairpin 31b is attached ranging over the row | line | columns 41 and 43 of the both ends except the center row | line | column 42 among 3 rows, as shown in FIG. That is, the 1st hairpin 31a and the 2nd hairpin 31b are inserted in the hole part 40 so that it may become diagonal (about 60 degree | times with respect to the flow direction (up-down direction X) of the air to cool).

  Further, in the present embodiment, as shown in FIG. 7, the plurality of hole portions 40 are viewed from the Z direction (a direction that forms an angle of about 60 degrees with respect to the flow direction of the air to be cooled). In a state where a plurality of rows are formed along the Z direction and the first hairpin 31a and the second hairpin 31b are attached, the straight tube portions T of the first hairpin 31a and the second hairpin 31b are dotted every other row. Will come to exist.

  In addition, the part shown with a dotted line in FIG. 7 is the short U-shaped pipes 31c and 31d attached to the opposite side metal fitting 32 by welding, and these short U-shaped pipes 31c and 31d are the first hairpin 31a and the second The adjacent ends of the hairpins 31b are connected. Thereby, as shown in FIG. 7, the refrigerant pipe 31 forms one refrigerant pipe while taking a zigzag path in a side view.

  Further, as shown in FIG. 5, a gourd-shaped attachment hole 32a is formed in the upper part of the side metal fitting 32, and a fastening member is inserted into the attachment hole 32a so as to be attached to the showcase body side. Yes.

FIGS. 8A and 8B are schematic views showing attachment of the refrigerant pipe 31, the long fins 30a, and the short fins 30b.
In the long fin 30a and the short fin 30b, a hole 35 is formed by burring a portion where the refrigerant pipe 31 is to be inserted, and a protruding portion 36 is formed by the burring. As shown in FIG. 8A, the protruding portion 36 has a protruding length that is the same as the fin pitch P1, and is assembled by abutting against adjacent fins in the upper portion 33a. Thereby, in the upper part 33a, the gap between the long fin 30a and the short fin 30b is assembled without being smaller than the fin pitch P1. The refrigerant pipe 31 is inserted through the hole 35, and the refrigerant pipe 31 and the fin 30 are assembled by a so-called interference fit.

  On the other hand, in the lower portion 33b, as shown in FIG. 8B, since the short fin 30b does not exist between the adjacent long fins 30a, the protruding portion 36 is not abutted against the adjacent fin. However, since the fins 30 are assembled while securing the fin pitch P1 in the upper portion 33a, the fin pitch P2 of the adjacent long fins 30a is necessarily secured.

In the above-described configuration, the fin pitch P2 is made longer than the length that makes it difficult for frost to form between the fins (the numerical value varies depending on the cooling capacity of each cooler) so that the frost is difficult to be attached. Further, the fin pitch P2 is larger than the maximum length of the protruding portion 36 that can be formed by burring based on the diameter of the hole 35 and the plate thickness of the fin to correspond to the thin refrigerant pipe for using the CO ₂ refrigerant. Is also long.
On the other hand, the fin pitch P1 is shorter than the length in which frost is difficult to be formed between the fins, and based on the diameter of the hole 35 and the plate thickness of the fin to correspond to the thin refrigerant pipe for using the CO ₂ refrigerant, The length of the projecting portion 36 that can be formed by burring is within the maximum length.

  According to the showcase according to the embodiment of the present invention, the plurality of hole portions 40 are arranged in three rows 41, 42, and 43 along the flow direction of the air to be cooled, and are arbitrarily selected. The three holes S1, S2 and S3 adjacent to each other are arranged so as to constitute the apex of a substantially equilateral triangle, and a plurality of hairpins are arranged so that the pitch of the two straight pipe portions T in the U-shape is one side of the equilateral triangle. The first hairpin 31a that is equal in length and is mounted across the row of adjacent hole portions 40, and has a pitch twice that of the first hairpin 31a, and straddles the rows at both ends excluding the central row 42 among the three rows. Therefore, the first hairpin and the second hairpin can be arranged so as to always straddle other rows. Therefore, compared with the case where hairpins are arranged in the same row, straight tube portions T of the plurality of hairpins 31a and 31b are not densely arranged in a part. As a result, it is possible to make it difficult for the cooler 8 to form frost, so that the flow of air cooled by the frost is prevented from being hindered, and the showcase 1 that realizes stable cooling performance can be provided. .

  Further, the plurality of holes 40 are arranged in a plurality of rows along a direction Z that forms an angle of about 60 degrees with respect to the flow direction X of the air to be cooled. Since the 1st hairpin 31a and the 2nd hairpin 31b are attached so that the straight tube | pipe part T in the U-shape of the 1st hairpin 31a and the 2nd hairpin 31b may be scattered every other row, the 1st hairpin 31a and the 2nd A gap between the straight pipe portions T of the hairpin 31b is secured, and a plurality of refrigerant pipes can be prevented from being densely arranged in a part. As a result, it is possible to make it difficult for the cooler 8 to form frost, so that the flow of air cooled by the frost is prevented from being hindered, and the showcase 1 that realizes stable cooling performance can be provided. .

The best mode for carrying out the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. .
In the present embodiment, the compressor 14, the heat exchanger 15 and the like constituting the refrigerant circuit are provided inside the showcase 1, but if the cooler 8 can be installed inside the showcase 1, the compressor 14. The heat exchanger 15 and the like may be separately provided outside. Thereby, the external dimension of the showcase 1 can be reduced and space saving can also be achieved.

It is the perspective view which looked at the showcase which concerns on embodiment of this invention from the front diagonal right side. It is a front view of the showcase which concerns on embodiment of this invention, Comprising: A part of inner wall part is notched and shown. It is side part sectional drawing cut | disconnected by the AA line of FIG. It is a front view which shows the cooler used for a showcase alone. FIG. 5 is a front view showing the cooling unit in an enlarged state, with the front cover of the cooler of FIG. 4 removed. It is an enlarged view of the B section shown in FIG. It is a left view of the cooling unit shown in FIG. It is a figure which shows attachment of the refrigerant | coolant pipe | tube 31, the long fin 30a, and the short fin 30b, Comprising: (a) is an upper part, (b) is a schematic diagram of a lower part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Showcase 3 Showcase main body 7 Duct 8 Cooler 10 Cold air outlet 11 Cold air inlet 13 Refrigerant pipe 14 Compressor 15 Heat exchanger 22 Cooling part 30 Fin 30a Long fin 30b Short fin 31 Refrigerant pipe 31a 1st hairpin 31b 2nd hairpin 31c, 31d Short U-shaped pipe 32 Side metal fittings 32a Mounting hole 33 Wire 33a Upper part (downstream side of air flow direction)
33b Lower part (upstream side of air flow direction)
34a Inflow connection port 34b Outflow connection port 35 Hole portion 36 Projection portion P1, P2 Fin pitch T Straight portion of hairpin X Vertical direction Y Horizontal direction

Claims (2)

A fin-and-tube type cooler in which a plurality of holes are respectively formed in a plurality of flat fins, and a plurality of hairpins in which refrigerant pipes are bent in a U shape are inserted into the holes is provided. A showcase that sends air cooled by a container to the vicinity of the display shelf,
The plurality of hole portions are arranged in three rows along the flow direction of the air to be cooled and arranged so that adjacent three hole portions constitute apexes of a substantially equilateral triangle, and the plurality of hairpins are a first hairpin pitch of the two straight pipe portions in shape equals the length of one side of the equilateral triangle, composed of the second hairpin to have a 2 times the pitch of the first hairpin, the first hairpin After connecting three rows of diagonally adjacent refrigerant tubes twice in succession, the refrigerant tubes at both ends excluding the middle row of the three rows are connected diagonally with a second hairpin, and the refrigerant tubes A showcase that is arranged in a flow direction of the air to be cooled while taking a zigzag path to form one refrigerant pipe .   The plurality of holes are arranged in a plurality of rows along a direction that forms an angle of about 60 degrees with respect to a flow direction of the air to be cooled, and when viewed from this direction, the first hairpin and 2. The showcase according to claim 1, wherein the first hairpin and the second hairpin are attached so that straight tube portions of the U-shape of the second hairpin are scattered every other row.

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