JP2016016106A - Open showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open showcase which effectively suppresses the disturbance of a cold air curtain and a protection air curtain.SOLUTION: An open showcase includes a cold air guide 31 provided in a position which is within a region where cold air blown out from an inner layer air outlet 23 flows and is separated from an inner end of the inner layer air outlet in a cold air blowout direction and an air guide 32 provided in a position which is within a region where air blown out from an outer layer air outlet 22 flows and is separated from an outer end of the outer layer air outlet in an air blowout direction. The guides respectively comprise plate-like members having a width equal to a width of the air outlets in a longitudinal direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an open showcase formed by forming two layers of inner and outer air curtains at the opening of a display chamber.

  Conventionally, this type of open showcase has been provided to display and sell products while refrigerated or refrigerated in the display room. It is open. In order for outside air to enter from this opening and deteriorate the cooling performance in the display room, an inner layer outlet and an outer layer outlet are formed at one end of the opening, and a suction port is formed at the other end. Cold air was blown out toward the air to form a cold air curtain at the opening and a protective air curtain inside.

  Here, a honeycomb rectifier is usually attached to each air outlet, and it is configured so that cold air is blown out uniformly from the air outlet. Is produced. That is, the cold air or air itself blown from the honeycomb rectifier to form a cold air curtain or a protective air curtain in the opening is a uniform and less turbulent flow. A vortex is generated by contact with the cool air in the display room. As this vortex develops, it moves along the flow of cold air and air. As a result, mixing of the outside air and the cooling air in the display room progresses toward the downstream side, resulting in a decrease in flow rate and an increase in temperature due to mixing of the outside air. It will be.

  FIG. 8 shows the turbulent energy distribution of the cold air curtain blown from the inner layer outlet 101 of the open showcase and the turbulent energy distribution of the protective air curtain blown from the outer layer outlet 102. . Reference numeral 103 denotes a display room, and reference numeral 104 denotes a front opening of the display room 103. Reference numeral 105 denotes a product display shelf installed in the display room 103.

As is apparent from this figure, for example, when attention is focused on a region of 0.03 m ² / s ² where the turbulent energy is large, each air curtain extends to a position far away from each outlet. A large turbulent energy indicates that the cold air curtain and the protective air curtain are turbulent.

  Such a disturbance of the air curtain raises the temperature in the display room and causes deterioration of the cooling performance. Therefore, conventionally, measures have been taken to suppress the turbulence of the cool air by attaching a guide protruding to the suction port side continuously to the air outlet, or by attaching a guide to the tip of a shelf installed in the display room (for example, (See Patent Document 1 and Patent Document 2).

JP-A-8-320176 JP 2013-153950 A

  However, even if a guide is continuously provided at the air outlet, the air curtain is disturbed as soon as the air or cold air that has passed through the guide contacts the outside air that is stationary or the cold air in the display chamber. End up. In addition, the measure for attaching the guide to the tip of the shelf has a drawback that the guide interferes with the delivery of the product and reduces the sales effect.

  The present invention has been made to solve the conventional technical problems, and an object of the present invention is to provide an open showcase that effectively suppresses the disturbance of the cold air curtain and the protective air curtain. .

  In order to solve the above problems, the open showcase of the invention of claim 1 includes an inner layer outlet and an outer layer outlet formed at one end of the opening of the display chamber, and a suction port formed at the other end of the opening, By blowing cool air from the inner layer outlet, a cold air curtain is formed at the opening, and by blowing air from the outer layer outlet, a protective air curtain is formed outside the cold air curtain, In the region where the cold air blown from the inner layer outlet flows, a region where the air blown from the outer layer outlet flows and the cold air guide provided at a position separated from the inner end of the inner layer outlet in the cold air outlet direction An air guide provided at a position spaced in the air blowing direction from the outer end of the outer layer outlet, and each guide has a width substantially equal to the longitudinal width of each outlet. Characterized in that it is constituted by a plate-like member.

  The open showcase of the invention of claim 2 includes an inner layer outlet and an outer layer outlet formed at one end of the opening of the display chamber, and a suction port formed at the other end of the opening, and blows out cool air from the inner layer outlet. By forming a cold air curtain at the opening and blowing out air from the outer layer outlet, a protective air curtain is formed outside the cold air curtain, and a honeycomb attached to each outlet A rectifying body, a cool air guide provided in a region where the cool air discharged from the honeycomb rectifier of the inner layer outlet flows, and spaced from the honeycomb rectifier in the cool air blowing direction, and a honeycomb rectifier of the outer layer outlet An air guide provided in a region where the air discharged from the air flows and spaced apart from the honeycomb rectifier in the air blowing direction. Characterized in that it is constituted by a plate-like member having a width substantially equal to the longitudinal width of the body.

  The open showcase of the invention of claim 3 is the distance from the inner end of the inner layer outlet to the position of the cold air guide, where WA is the width from the outer end to the inner end of the inner layer outlet in each of the above inventions, It is characterized by being set to 1/2 WA or less.

  The open showcase of the invention of claim 4 is characterized in that in each of the above-mentioned inventions, the distance from which the cold air guide is separated from the inner layer outlet or the honeycomb rectifier of the inner layer outlet is HA, and the width from the outer end to the inner end of the inner layer outlet is When WA is set, 1 / 5WA ≦ HA ≦ 1 / 2WA is set.

  The open showcase of the invention of claim 5 is the distance from the outer end of the outer layer outlet to the position of the air guide when the width from the outer end to the inner end of the outer layer outlet is WB in each of the above inventions. It is characterized by being set to 1/2 WB or less.

  In the open showcase of the invention of claim 6, the distance from which the air guide is separated from the outer layer outlet or the honeycomb rectifier of the outer layer outlet in each of the above inventions is HB, and the width from the outer end to the inner end of the outer layer outlet is When WB, 1/5 WB ≦ HB ≦ 1/2 WB is set.

  An open showcase according to a seventh aspect of the present invention is characterized in that, in each of the above-mentioned inventions, a cross section obtained by cutting the cold air guide and the air guide along a plane perpendicular to the longitudinal direction has a symmetrical wing shape.

  The open showcase of the invention of claim 8 is characterized in that, in each of the above inventions, the cold air guide and the air guide are made of a transparent material.

  According to the present invention, an inner layer outlet and an outer layer outlet formed at one end of the opening of the display chamber, and a suction port formed at the other end of the opening are provided. In an open showcase in which an air curtain is formed and air is blown out from the outer layer outlet to form a protective air curtain on the outside of the cold air curtain, in the area where the cold air blown out from the inner layer outlet flows The cool air guide is provided at a position spaced in the cool air blowing direction from the inner end of the inner layer outlet, and the air blown from the outer layer outlet flows in the region where air flows from the outer end of the outer layer outlet. Air guides were provided at positions separated in the blowing direction, and each guide was constituted by a plate-like member having a width substantially equal to the width in the longitudinal direction of each outlet.

  The cold air coming out from the inner layer outlet of the open showcase attracts the cold air from the point of contact with the cold air in the display room, and generates a flow in the direction along the cold air curtain. Due to the attraction of cool air in the display chamber, a vortex is likely to be generated in the cool air curtain. In the present invention, the vortex is generated, that is, the inner end of the inner layer outlet, or the direction of blowout from the honeycomb rectifier. Since the cold air guide is provided at a position spaced apart from each other, the development of the vortex can be suppressed by this cold air guide.

  Thereby, the flow velocity distribution along the cold air curtain is formed, and the disturbance of the cold air curtain is suppressed.

  On the other hand, the air that has exited from the outer layer outlet attracts the outside air from the point of contact with the outside air, and generates a flow in the direction along the protective air curtain. Due to the attraction of the outside air, a vortex tends to be generated in the protective air curtain, but in the present invention, the vortex is generated, that is, in the blowing direction from the outer end of the outer layer outlet or the honeycomb rectifier. Since the air guide is provided at the separated position, the development of the vortex can be suppressed by this air guide.

  Thereby, the flow velocity distribution along the protective air curtain is formed, and mixing with outside air due to the disturbance of the air curtain is also suppressed. That is, according to the present invention, the disturbance of the inner cool air curtain is suppressed, and the disturbance of the outer protective air curtain is also suppressed, so that the protection function of the cool air curtain is improved. In addition, since mixing with outside air due to disturbance of the protective air curtain is also suppressed, it is possible to remarkably improve the cooling effect in the display room of the open showcase in which the two-layer air curtain is formed in the opening. Become.

  In this case, when the width from the outer end to the inner end of the inner layer outlet is WA as in the invention of claim 3, the distance from the inner end of the inner layer outlet to the position of the cold air guide is ½ WA or less. By setting, disturbance of the cold air curtain can be further effectively suppressed.

  Further, when the distance from the inner layer outlet or the honeycomb rectifier to the cold air guide is HA, and the width from the outer end to the inner end of the inner layer outlet is WA, as in the invention of claim 4, 1/5 WA ≦ HA ≦ By setting to 1/2 WA, it is possible to eliminate the inconvenience that the cold air guide interferes with the delivery of the product while effectively suppressing the development of the vortex.

  Further, when the width from the outer end to the inner end of the outer layer outlet is WB as in the invention of claim 5, the distance from the outer end of the outer layer outlet to the position of the air guide is set to ½ WB or less. By doing so, mixing of the protective air curtain and the outside air can be more effectively suppressed.

  Further, when the distance from the outer layer outlet or the honeycomb rectifier to the air guide is HB and the width from the outer end to the inner end of the outer layer outlet is WB as in the invention of claim 6, 1/5 WB ≦ HB ≦ By setting it to 1/2 WB, it is possible to eliminate the inconvenience that the air guide interferes with the delivery of goods while effectively suppressing the development of vortices.

  In particular, the cross section obtained by cutting each guide by a plane perpendicular to the longitudinal direction as in the invention of claim 7 is formed into a symmetrical wing shape, so that the cold air and the air smoothly flow along the front and outer surfaces of the cold air guide and the air guide. , Can effectively suppress the development of vortex.

  In addition, since each guide is made of a transparent material as in the eighth aspect of the invention, the product display effect in the display room is not adversely affected.

It is a vertical side view of the open showcase of one Example to which this invention is applied. It is a general | schematic expanded sectional view of the blower outlet part of the open showcase of FIG. It is a vertical side view of the cold air guide and air guide of the open showcase of FIG. It is a schematic diagram explaining the vortex development suppression effect by the air guide of FIG. The distance (interval) HA between the inner air outlet of the open showcase and the cold air guide in FIG. 1 when the flow velocity of the cold air curtain and the protective air curtain is 1.2 m / s, and the outer air outlet outer edge and the air It is a figure which shows the relationship between the distance (interval) HB between guides, and display room average temperature. The distance (interval) HA between the inner air outlet of the open showcase and the cold air guide in FIG. 1 when the flow velocity of the cold air curtain and the protective air curtain is 1.9 m / s, and the outer air outlet and the outer air It is a figure which shows the relationship between the distance (interval) HB between guides, and display room average temperature. Distance (interval) HA between the inner air outlet of the open showcase and the cold air guide and the outer air outlet of the outer air outlet and the air when the flow velocity of the cold air curtain and the protective air curtain is 0.9 m / s. It is a figure which shows the relationship between the distance (interval) HB between guides, and display room average temperature. It is a figure which shows the turbulent energy distribution of each air curtain when not providing a cool air guide and an air guide in the open showcase of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. An open showcase 1 according to the embodiment is a vertical open showcase installed in a store such as a supermarket, and includes a heat insulating wall 2 having a substantially U-shaped cross section and side plates 3 attached to both sides of the heat insulating wall 2 at the installation site. (FIG. 2). An outer layer partition plate 4 and an inner layer partition plate 6 are attached to the inner side of the heat insulation wall 2 with a space therebetween, and the space between the heat insulation wall 2 and the outer layer partition plate 4 is between the outer layer duct 7 and the inner and outer layer partition plates 6 and 4. Is an inner layer duct 8, and an inner side of the inner layer partition plate 6 is a display chamber 9.

  A plurality of shelves 11 are installed in the display chamber 9, and a deck pan 12 is attached to the bottom of the display chamber 9. A bottom duct 13 that communicates with the ducts 7 and 8 is disposed below the deck pan 12. Has been. In the bottom duct 13, fan cases 16 each incorporating an inner layer blower 14 </ b> A and an outer layer blower 14 </ b> B described later are installed. In addition, an evaporator 17 is provided vertically in the lower part of the inner layer duct 8 located behind the display chamber 9.

  An outer layer outlet 22 and an inner layer outlet 23 are arranged side by side at the upper edge of the front opening 21 of the display chamber 9. The outer layer outlet 22 is connected to the outer layer duct 7, and the inner layer outlet 23 is connected to the inner layer duct 8. Each communicates. The inner layer outlet 23 is provided with an inner layer honeycomb rectifier 24, and the outer layer outlet 22 is provided with an outer layer honeycomb rectifier 26. Further, a suction port 27 is formed at the lower edge of the opening 21 and communicates with the bottom duct 13.

  Further, the inside of the fan case 16 is divided into an inner layer region and an outer layer region, the inner layer region communicates with the inner layer duct 8 and the suction port 27, and the outer layer region communicates with the outer layer duct 7 and the suction port 27. Yes. Furthermore, the inner layer blower 14A is provided in the inner layer region, and the outer layer blower 14B is provided in the outer layer region.

  When the inner layer blower 14A in the fan case 16 is operated, air from the suction port 27 is blown out toward the rear inner layer duct 8, and when the outer layer blower 14B is operated, the air is discharged from the suction port 27. The air is blown out toward the rear outer duct 7.

  Then, the air is blown up as it is in the outer layer duct 7, and is blown up after exchanging heat with the evaporator 17 in the inner layer duct 8, from the inner and outer layer outlets 23, 22 on the upper edge of the opening 21 to the inlet 27 on the lower edge. Each is blown out.

  As a result, an inner cold air curtain and an outer air curtain (air air curtain) that protects the inner cool air curtain are formed in the opening 21 of the display chamber 9, and the entry of outside air from the opening 21 is prevented or suppressed. At the same time, a part of the inner cool air curtain is circulated in the display chamber 9 to cool the display chamber 9. And these cold air etc. return to the bottom duct 13 from the suction inlet 27, and are suck | inhaled again by air blower 14A, 14B.

  Here, as shown in an enlarged view in FIG. 2, in the present invention, in the region where the cold air blown out from the inner layer outlet 23 flows, the lower side of the inner layer outlet 23, that is, the inner end of the inner layer outlet 23. The cool air guide 31 is provided at a position spaced apart from the following (X3) in the cool air blowing direction. Further, in the region where the air blown out from the outer layer outlet 22 flows, at a position below the outer layer outlet 22, that is, at a position away from the outer end (X1 below) of the outer layer outlet 22 in the air blowing direction. An air guide 32 is provided.

  The cold air guide 31 and the air guide 32 of the embodiment are both plate-like members made of a transparent hard resin material. And the cold air | gas guide 31 has a width | variety substantially equal to the width | variety of the longitudinal direction (left-right direction) of the inner-layer blower outlet 23, The cross section cut | disconnected by the surface (front-back direction surface) orthogonal to the longitudinal direction is FIG. It has a symmetrical wing shape as shown in Fig. 1.

  On the other hand, the air guide 32 has a width substantially equal to the width of the outer layer outlet 22 in the longitudinal direction (left-right direction), and a cross section cut along a plane orthogonal to the longitudinal direction (front-rear direction plane) is also shown in FIG. The same symmetrical wing shape as shown in FIG.

  Further, the position of the cold air guide 31 in the front-rear direction is defined as that of the inner layer outlet 23 when the width from the outer end (front end) X2 to the inner end (rear end) X3 of the inner layer outlet 23 shown in FIG. The distance from the end X3 to the position of the cold air guide 31 is set to be 1 / 2WA or less.

  Further, the position of the air guide 32 in the front-rear direction is the width from the outer end (front end) X1 to the inner end (rear end, which is the outer end of the inner layer outlet 23) X2 of the outer layer outlet 22 shown in FIG. In this case, the distance from the outer end X1 of the outer layer outlet 22 to the position of the air guide 32 is set to be ½ WB or less.

  In the embodiment, as shown in FIG. 2, the cold air guide 31 is disposed in the region where the cold air flows at the inner end X3 of the inner layer outlet 23 (that is, in the front-rear direction from the inner end X3 to the position of the cold air guide 21). The distance is zero). The inner end X3 is a position (position in the front-rear direction) where the cold air blown out from the inner layer outlet 23 comes into contact with the cold air in the display chamber 9.

  Further, the vertical position of the cool air guide 31, that is, the distance HA at which the cool air guide 31 is separated from the inner end X3 of the inner layer outlet 23 is set to 1 / 5WA ≦ HA ≦ 1 / 2WA in the embodiment. In the embodiment, the honeycomb rectifying body 24 of the inner layer outlet 23 is positioned above and below the lower end of the inner end X3 of the inner layer outlet 23. However, the honeycomb rectifying body 24 is connected to the outer end X2 and the inner end of the inner layer outlet 23. When the distance X is provided up to the lower end of the end X3 (positions indicated by X2 and X3 in FIG. 2), the distance HA may be a distance from the honeycomb rectifier 24.

  Further, in the embodiment, the lower end of the inner layer outlet 23 (the position of the line connecting X2 and X3 in FIG. 2) is grasped as a position where the blown cold air comes into contact with the cold air in the display chamber 9, and the following explanation will be given. As shown in FIG. 2, the honeycomb rectifying body 24 is located above and below the lower end of the inner layer outlet 23, and the position immediately after exiting the honeycomb rectifying body 24 is in contact with the cool air in the display chamber 9 (that is, the inner layer). When it is grasped as an air outlet), the position of the upper end of the cold air guide 31 is above the lower end of the inner layer air outlet 23 in FIG. 2 (the position of the line connecting X1 and X2 shown in FIG. 2). (Position away from the honeycomb rectifier 24).

  On the other hand, in the embodiment, as shown in FIG. 2, the air guide 32 is arranged in the region where the air at the outer end X1 of the outer layer outlet 22 flows (that is, in the front-rear direction from the outer end X1 to the position of the air guide 32). The distance is zero). This outer end X1 is a position (position in the front-rear direction) where the air blown from the outer layer outlet 22 comes into contact with the outside air.

  The vertical position of the air guide 32, that is, the distance HB at which the air guide 32 is separated from the outer end X1 of the outer layer outlet 22, is set to 1/5 WB ≦ HB ≦ 1/2 WB in the embodiment. In the embodiment, the honeycomb rectifying body 26 of the outer layer outlet 22 is located above and below the lower end of the outer end X1 of the outer layer outlet 22, but the honeycomb rectifying body 26 is connected to the outer end X1 and the inner end of the outer layer outlet 22. In the case where it is provided up to the lower end of the end X2 (positions indicated by X1 and X2 in FIG. 2), the distance HB may be a distance from the honeycomb rectifier 26.

  Further, in the embodiment, the lower end of the outer layer outlet 22 (the position of a line L1 connecting X1 and X2 in FIG. 4 described later) is grasped as a position where the blown air comes into contact with the outside air, and the following explanation will be given. In this case, the honeycomb rectifying body 26 is located above and below the lower end of the outer layer air outlet 22, and the position immediately after exiting the honeycomb rectifying body 26 is recognized as the contact position with the outside air (that is, the outer layer air outlet). In some cases, the position of the upper end of the air guide 32 may be above the lower end of the outer layer outlet 22 of FIG. 2 (the position of the line L1 connecting X1 and X2 shown in FIG. 4) (honeycomb rectifier). 26).

  Hereinafter, effects of the air guide 32 and the cold air guide 31 according to the present invention will be described with reference to FIGS. As described above, the air and cold air blown from the honeycomb rectifiers 26 and 24 provided at the outer layer outlet 22 and the inner layer outlet 23 of the open showcase 1 are a uniform and less turbulent flow. However, a vortex is generated in the protective air curtain by coming into contact with the outside air immediately after exiting from the outer layer outlet 22, and by contacting with the cool air in the display chamber 9 immediately after exiting from the inner layer outlet 23. A vortex is generated in the cold air curtain.

  Next, this state will be described with reference to the schematic diagram of FIG. FIG. 4 shows only the outer layer outlet 22 in order to simplify the description. Also in the case of the present invention, the air guide 32 is provided at a position spaced from the outer end X1 of the outer layer outlet 22 in the blowing direction, so that the air emitted from the outer layer outlet 22 attracts outside air as shown in FIG. Thus, a flow in the direction along the protective air curtain is generated. The air immediately after coming out of the outer layer outlet 22 comes into contact with the outside air and a vortex is generated there. That is, in the present invention, the air guide 32 is not provided continuously to the outer layer outlet 22 but is intentionally generated by separating it. The generated vortex also flows along the protective air curtain. However, in the present invention, since the air guide 32 is provided there, the vortex is canceled by the air guide 32 and the development is suppressed (FIG. 4). Thereby, the flow velocity distribution along the protective air curtain is formed, and mixing with the outside air due to turbulence is suppressed.

  In particular, as shown in FIG. 3, the cross section obtained by cutting the air guide 32 along a plane orthogonal to the longitudinal direction has a symmetrical wing shape, so that air flows smoothly along the front surface and the outer surface of the air guide 32. Become. As a result, the development of vortices can be effectively suppressed.

  Further, in the embodiment, as described above, the air guide 32 is disposed in the region where the air flows at the outer end X1 of the outer layer outlet 22. The outer end X1 is a position where the air blown from the outer layer outlet 22 comes into contact with the outside air, and by arranging the air guide 32 at the outer end X1, it becomes possible to remarkably improve the vortex suppressing effect. .

  The above description can be similarly applied to the cool air guide 31 with respect to the cool air in the display chamber 9. That is, since the cool air guide 31 is provided at a position spaced apart from the inner end X3 of the inner layer outlet 23 in the blowing direction, the cool air that has come out of the inner layer outlet 23 attracts the cool air in the display chamber 9 and becomes a cold air curtain. Generate a flow in the direction along. The cold air immediately after exiting from the inner layer outlet 23 comes into contact with the cold air in the display chamber 9 and a vortex is generated there. That is, in the present invention, the cold air guide 31 is not provided continuously to the inner layer outlet 23, but is intentionally generated by separating it. The generated vortex also flows along the cold air curtain, but in the present invention, since the cold air guide 31 is provided there, the vortex is canceled by the cold air guide 31 and the development is suppressed. Thereby, the flow velocity distribution along the cold air curtain is formed, and the turbulence is suppressed.

  In particular, as shown in FIG. 3, the cross section obtained by cutting the cold air guide 31 along a plane orthogonal to the longitudinal direction has a symmetrical wing shape, so that the cold air flows smoothly along the front surface and the outer surface of the cold air guide 31. Become. As a result, the development of vortices can be effectively suppressed.

  Further, in the embodiment, as described above, the cold air guide 31 is disposed in the region where the cold air flows in the inner end X3 of the inner layer outlet 23. This inner end X3 is a position where the cold air blown out from the inner layer outlet 23 comes into contact with the cold air in the display chamber 9, and by arranging the cold air guide 31 at the inner end X3, the effect of suppressing the vortex is remarkably improved. It becomes possible.

  Next, FIG. 5 shows the display when the distance HA where the cool air guide 31 is separated from the inner end X3 of the inner layer outlet 23 and the distance HB where the air guide 32 is separated from the outer end X1 of the outer layer outlet 22 are changed. The result of having measured the average temperature (average value of 15 evaluation points) in the chamber 9 is shown. The broken line indicates the case where the guides 31 and 32 are not provided, and the solid line indicates the case where the cold air guide 31 and the air guide 32 are provided. Accordingly, HA (HB) = 0 in the figure is the case where the guides 31 and 32 are continuously provided at the outlets 23 and 22, respectively. The width in the front-rear direction of each outlet 22 and 23 is 65 mm.

  As is apparent from this figure, when the flow velocity is 1.2 m / s, the average temperature in the display chamber 9 is lowest at a position of HA = HB = 13 mm, that is, 1/5 WA (1/5 WB). And it turns out that it becomes favorable to the position of HA (HB) = 32.5 mm, ie, 1/2 WA (1/2 WB).

  6 shows the average temperature in the display chamber 9 when the flow velocity of the cold air curtain is 1.9 m / s, and FIG. 7 shows the display chamber when the flow velocity of the cold air curtain is 0.9 m / s. 9 shows the average temperature. In the case of FIG. 6, the peak at the lower end is slightly unclear, but in any case, the inside of the display chamber 9 falls within the range of 1/5 WA ≦ HA ≦ 1/2 WA and 1/5 WB ≦ HB ≦ 1/2 WB. It can be seen that the average temperature is lowered.

  As described above in detail, in the present invention, the cold air guide 31 is provided in a region where the cold air blown out from the inner layer outlet 23 flows and is spaced from the inner end X3 of the inner layer outlet 23 in the cold air blowing direction. The air guide 32 is provided in a region where the air blown from the outer layer outlet 22 flows and is spaced from the outer end X1 of the outer layer outlet 22 in the air blowing direction. Since it is composed of a plate-like member having a width substantially equal to the width in the longitudinal direction of the air outlets 23, 22, the cold air coming out from the inner layer air outlet 23 of the open showcase 1 comes into contact with the cold air in the display chamber 9 The cool air is attracted from the air to generate a flow in the direction along the cool air curtain. Due to the attraction of the cool air in the display chamber 9, a vortex is likely to be generated in the cool air curtain. In the present invention, the vortex is generated, that is, the inner end X 3 (or honeycomb adjustment) of the inner layer outlet 23. Since the cold air guide 31 is provided at a position separated from the fluid 24) in the blowing direction, the cold air guide 31 can suppress the development of vortices. Thereby, the flow velocity distribution along the cold air curtain is formed, and the disturbance of the cold air curtain is suppressed.

  On the other hand, the air that has exited from the outer layer outlet 22 attracts the outside air from the point of contact with the outside air, and generates a flow in a direction along the protective air curtain. Due to the attraction of the outside air, a vortex is likely to be generated in the protective air curtain. In the present invention, the vortex is generated, that is, from the outer end X1 of the outer layer outlet 22 (or from the honeycomb rectifier 26). Since the air guide 32 is provided at a position separated in the blowing direction, the air guide 32 can suppress the development of vortices.

  Thereby, the flow velocity distribution along the protective air curtain is formed, and mixing with outside air due to the disturbance of the air curtain is also suppressed. That is, according to the present invention, the disturbance of the inner cool air curtain is suppressed, and the disturbance of the outer protective air curtain is also suppressed, so that the protection function of the cool air curtain is improved. Moreover, since mixing with outside air due to the disturbance of the protective air curtain is also suppressed, the cooling effect in the display chamber 9 of the open showcase 1 in which the two-layer air curtain is formed in the opening is remarkably improved. Is possible.

  Further, when the width from the outer end X2 to the inner end X3 of the inner layer outlet 23 is WA, the distance from the inner end X3 of the inner layer outlet 23 to the position of the cold air guide 31 is set to 1/2 WA or less. Therefore, the disturbance of the cold air curtain can be more effectively suppressed.

  Further, when the distance from the inner layer outlet 23 (or the honeycomb rectifier 24) to the cool air guide 31 is HA, and the width from the outer end X2 to the inner end X3 of the inner layer outlet 23 is WA, 1/5 WA ≦ Since HA ≦ 1 / 2WA is set, it is possible to eliminate the inconvenience that the cool air guide 31 interferes with the delivery of goods while effectively suppressing the development of vortices.

  Furthermore, when the width from the outer end X1 to the inner end X2 of the outer layer outlet 22 is WB, the distance from the outer end X1 of the outer layer outlet 22 to the position of the air guide 32 is set to ½ WB or less. Therefore, mixing of the protective air curtain and the outside air can be more effectively suppressed.

  Further, when the distance from the outer layer outlet 22 (or the honeycomb rectifier 26) to the air guide 32 is HB and the width from the outer end X1 to the inner end X2 of the outer layer outlet 22 is WB, 1/5 WB ≦ Since HB ≦ 1 / 2WB is set, it is possible to eliminate the inconvenience that the air guide 32 interferes with the delivery of goods while effectively suppressing the development of vortices.

  In particular, since the cross section cut by a plane orthogonal to the longitudinal direction of each guide 31, 32 has a symmetric wing shape, cold air and air smoothly flow along the front and outer surfaces of the cold air guide 31 and the air guide 32. It is possible to suppress the development of vortices.

  Moreover, since each guide 31 and 32 is comprised with the transparent material, it does not have a bad influence on the merchandise display effect in the display chamber 9. FIG.

  In addition, each numerical value shown in the Example is not restricted to it, and it cannot be overemphasized that it should change suitably according to the dimension and application of an open showcase.

DESCRIPTION OF SYMBOLS 1 Open showcase 4 Outer layer partition plate 6 Inner layer partition plate 7 Outer layer duct 8 Inner layer duct 9 Display room 11 Shelf 12 Deck pan 13 Bottom duct 14A, 14B Blower 17 Evaporator 22 Outer layer outlet 23 Inner layer outlet 24, 26 Honeycomb rectifier 27 Air inlet 31 Cold air guide 32 Air guide

Claims (8)

An inner layer outlet and an outer layer outlet formed at one end of the opening of the display chamber, and a suction port formed at the other end of the opening, and a cold air curtain is provided to the opening by blowing out cold air from the inner layer outlet. In an open showcase formed by forming an air curtain for protection on the outside of the cold air curtain by blowing out air from the outer layer outlet,
A cold air guide provided in a region where the cold air blown out from the inner layer outlet flows and at a position separated from the inner end of the inner layer outlet in the cold air outlet direction;
An air guide provided in a region where air blown out from the outer layer outlet flows and provided at a position spaced apart from the outer end of the outer layer outlet in the air blowing direction;
Each of the guides is constituted by a plate-like member having a width substantially equal to the width in the longitudinal direction of each of the air outlets. An inner layer outlet and an outer layer outlet formed at one end of the opening of the display chamber, and a suction port formed at the other end of the opening, and a cold air curtain is provided to the opening by blowing out cold air from the inner layer outlet. In an open showcase formed by forming an air curtain for protection on the outside of the cold air curtain by blowing out air from the outer layer outlet,
A honeycomb rectifier attached to each of the air outlets;
A cold air guide provided in a region where the cold air flowing out of the honeycomb rectifier of the inner layer outlet flows and which is separated from the honeycomb rectifier in the cold air blowing direction;
An air guide provided in a region in which air exiting from the honeycomb rectifier of the outer layer outlet flows and provided at a position separated from the honeycomb rectifier in the air blowing direction;
Each of the guides is constituted by a plate-like member having a width substantially equal to the width in the longitudinal direction of each of the honeycomb rectifiers.   The distance from the inner end of the inner layer outlet to the position of the cold air guide is set to 1/2 WA or less, where WA is the width from the outer end to the inner end of the inner layer outlet. The open showcase according to claim 1 or claim 2.   1/5 WA ≦ HA ≦ 1 where HA is the distance from the inner layer outlet or the honeycomb rectifier of the inner layer outlet, and the distance from the outer end to the inner end of the inner layer outlet is WA. The open showcase according to claim 1, wherein the open showcase is set to / 2WA.   The distance from the outer end of the outer layer outlet to the position of the air guide is set to ½ WB or less when the width from the outer end to the inner end of the outer layer outlet is WB. The open showcase in any one of Claims 1 thru | or 4.   When the distance from which the air guide is separated from the outer layer outlet or the honeycomb rectifier of the outer layer outlet is HB, and the width from the outer end to the inner end of the outer layer outlet is WB, 1/5 WB ≦ HB ≦ 1 6. The open showcase according to claim 1, wherein the open showcase is set to / 2WB.   The open showcase according to any one of claims 1 to 6, wherein a cross section of the cold air guide and the air guide cut along a plane orthogonal to the longitudinal direction has a symmetric wing shape.   The open showcase according to any one of claims 1 to 7, wherein the cold air guide and the air guide are made of a transparent material.

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