JPH0727468A - Show case - Google Patents

Abstract

PURPOSE:To pass a circulating flow blown against a part directed toward a rotating direction of a vane end surface of a vane wheel without any striking and to prevent moisture in the circulating flow from being adhered to the wheel as its fog form by a method the vane end surface of the vane wheel of a blower is formed by a projected and curved surface in an outer circumferential direction of the vane. CONSTITUTION:A part of air sucked in an air passage 6 by a blower 25 through a suction port 8 cools goods displayed in a case 1. The air is sucked again from the suction port 8 so as to form a circulating flow 23. End surfaces 33 of four vanes 31 integrally formed with a vane wheel 27 to which the circulating flow 23 is blown are formed by the projected and curved surfaces 35 in a direction of outer circumference of each of the vanes 31 including the portions directed toward the rotating direction of the vane wheel 27. With such an arrangement as above, the circulating flow 23 blown against the portions can be passed without any striking action and further it is possible to prevent moisture in the air from becoming fog and adhered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporator in which goods are refrigerated or frozen and displayed for display, and a ventilation path formed in a case having an open front or upper surface is blown by an axial blower. The present invention relates to a showcase that cools a product with air that is chilled by and becomes cold air.

[0002]

2. Description of the Related Art In a showcase in which a product is refrigerated or frozen and stored and displayed in a case whose front or upper surface is open, the case is formed of a heat insulating wall. Inside the case, there are formed a blow-out port and a suction port, both ends of which are open along the upper and lower edges or the front and rear edges of the front opening or the top opening of the case, respectively, and the opening surfaces face each other vertically or front and back. A ventilation passage is formed along the inner peripheral surface of the case.

[0003] This ventilation passage is generally formed by surrounding the case with a partition lined at a distance along the inner peripheral surface of the case and the case, and in the ventilation passage, evaporation that constitutes a refrigerator is formed. And a blower of axial flow type are provided. The air blown by this blower and sucked into the ventilation passage from the suction port is cooled by the evaporator to become cool air, and a part of it is blown out from the blowout port to form an air curtain that covers the front opening or the top opening of the case. Keep the case cool. In addition, another part flows into the case to cool the products displayed in the case and form a circulation flow that circulates in the case.

When the ambient temperature of the blower becomes 0 ° C. or less, the water contained in the circulating flow is directed in the rotating direction of the impeller constituting the blower and parallel to the axial direction of the rotating shaft of the impeller. If a surface having a straight line whose cross section is substantially parallel to the axial direction is formed at the blade end surface portion of the impeller, frost adheres to this portion. As the ambient temperature of the blower becomes lower, the amount of this frost increases and becomes bloated.
The cooling performance in the case deteriorates due to changes in the flow rate of the circulation flow, and frost that adheres to the blade tip surface and becomes enlarged contacts the members arranged in the case adjacent to the impeller, generating noise. Or Therefore, it is desirable that the rotary blade end surface of the impeller does not have a flat portion that faces the rotational direction of the impeller and is flat in the direction perpendicular to this rotational direction. One of the conventional examples of this type of showcase is shown in FIG. Through FIG. FIG. 4 shows the structure of a showcase to which the present invention is applied. (A) is a left-side longitudinal sectional view, (B) is an enlarged perspective view of a main part of (A) as seen from the front upper left, (A) Is the front side on the right side of the drawing, and FIG. 5 is a perspective view of the impeller forming the blower of FIG. FIG. 6 shows a state of frost adhering to the end surface of the impeller of a conventional showcase, and (A) and (B) are cross-sectional views of the impeller blade parallel to the axial direction of the impeller rotating shaft. The upper side of the figure is the front side, and (C) shows the appearance of the impeller. In FIGS. 4 to 6, reference numeral 1 denotes a case in which a product is displayed and displayed inside, which has an opening 2 which is opened to a large extent on the front surface. The case 1 is formed of a heat insulating wall, has a front body and left and right side surfaces that are open, and has a C-shaped side longitudinal cross section, and a flat side plate that covers the left and right side surface openings of the case body 3. It is composed of 4 and.

Inside the case 1, which is composed of the side plate 4 and the case body 3, the front surface and the left and right side surfaces are open.
Partition walls 5 having a C-shaped vertical cross section are lined at intervals along the inner peripheral surface of the case body 3. This case 1 and partition wall 5
The space surrounded by and forms an air passage 6 whose both ends open along both the upper and lower edges of the opening 2, and the openings of the both ends of the air passage 6 whose opening surfaces face each other vertically are blown. The outlet 7 and the suction port 8 are formed respectively. The upper opening of the suction port 8 is the upper end of the front end of the lower part of the partition wall 5, in which a plurality of vent holes 9 are arranged in the left and right, and the lower opening of the blowout port 7 has a honeycomb shape with open upper and lower surfaces. Each is covered with the rectifying body 10.

An evaporator 11 and an axial flow type blower 12 are installed in front and rear side by side with the blower 12 on the front side at the inner bottom portion of the ventilation passage 6 in which the lower surface opening of the air outlet 7 is covered with the rectifying body 10. There is. The blower 12 includes an electric motor 13 and an impeller 15 fixed to the shaft end of a rotary shaft 14 of the electric motor 13 and formed of a thin plate of aluminum.
The impeller 15 is integrally formed with four blades 16 by press working. End face 1 of each of these four wings 16
Reference numeral 7 denotes a straight line whose cross section parallel to the axial direction of the rotary shaft 14 formed by a shearing surface sheared in the plate thickness direction by press working and which has the axial length of the rotary shaft 14. A cross section substantially perpendicular to the direction is formed by a curved surface 18.

On the other hand, on the front side of the evaporator 11, there is provided a box-shaped partition member 19 having an open lower surface and a rear surface for partitioning the inner bottom portion of the ventilation passage 6 in the front and rear. Has a ventilation hole 20 through which air that is blown by the blower 12 and flows through the ventilation passage 6 is passed. The impeller 15 is inserted into the ventilation hole 20 so that the blower 12 operates as the partition member 1.
9, a plurality of display shelves 21 for displaying and displaying products are vertically arranged in the case 1, and the rear ends thereof are cantilever-supported on the vertical wall surface on the depth side of the partition wall 5. ing.

In the conventional showcase configured as described above, the air sucked into the ventilation passage 6 by the blower 12 from the suction port 8 is cooled by the evaporator 11 to become cold air, and a part of the air is blown out from the air outlet 7. The case 1 is formed by forming an air curtain 22 that covers the opening 2 by being rectified by the rectifying body 10 to form a laminar flow.
Keep the inside cool. The other part flows into the case 1 to cool the products displayed and displayed in the case 1, and forms a circulation flow 23 that is sucked again from the suction port 8 and circulates.

[0009]

By the way, in such a conventional showcase, the blower 12 is composed of the electric motor 13 and the impeller 15, and the impeller 15 has 4
Two wings 16 are integrally formed. The end surfaces 17 of the four blades 16 each have a cross section parallel to the axial direction of the rotary shaft 14 that is a straight line substantially parallel to the axial direction, and a cross section substantially perpendicular to the axial direction of the rotary shaft 14. It is formed by a curved surface 18 which is a curved line.

As a result, the inside of the case 1 is kept cool by the air that is sucked into the ventilation passage 6 from the suction port 8 by the blades 16 of the impeller 15 that rotates with the rotation of the electric motor 13 and is cooled by the evaporator 11 to become cold air. In addition, the products displayed in the case 1 can be cooled. However, since the end surface 17 of each of the four blades 16 formed integrally with the impeller 15 is formed by the curved surface 18, when the ambient temperature of the blower 12 becomes 0 ° C or lower, as shown in FIG. The circulation flow 23 blown toward this portion collides with a portion of the impeller 17 that faces the rotational direction of the impeller 15. Then, the water contained in the circulation flow 23 adheres to the portion of the end surface 17 facing the rotation direction of the impeller 15 as frost 24, and the frost 24 becomes lower as the ambient temperature of the blower 12 decreases. The amount increases and becomes bloated.

Therefore, the flow rate of the circulation flow 23 changes, the cooling performance in the case 1 deteriorates, and the frost 24 adhered to the end surface 17 and enlarged is adjacent to the impeller 15.
There is a problem that it may come into contact with and generate noise. This invention, even if the ambient temperature of the blower is below 0 ° C,
An object of the present invention is to provide a showcase provided with a blower that does not generate cooling due to frost adhering to the blade end surface portion of an impeller and causing enlargement.

[0012]

In order to solve the above-mentioned problems, according to the present invention, a product is formed in a case formed by a heat insulating wall in which a product is refrigerated or frozen and stored and displayed for display. In this case, an evaporator and an axial-flow blower are provided in a ventilation passage formed at both ends with a blow-out port and a suction port that open respectively along the upper and lower edges or the front and rear edges facing each other of the front or top opening of the case. In a showcase in which the product is cooled by air that is blown by the blower and cooled by the evaporator to become cool air, which is sucked from the suction port and flows in the ventilation passage, the impeller blade end surface of the blower is It is assumed that the blade is formed with a convex curved surface in the outer peripheral direction.

Further, it is assumed that the curved surface forming the impeller blade end surface is formed by mechanically processing the blade formed of a thin metal plate. Further, it is assumed that the curved surface forming the impeller blade end surface is formed of a coating material containing a coating material that coats the surface of the core of the blade formed of a thin metal plate.

[0014]

According to the present invention, since the impeller blade end surface of the blower is formed by the curved surface which is convex in the outer peripheral direction of the blade according to the above configuration, the impeller of the impeller having the curved surface which is convex in the outer peripheral direction of the blade. It is possible to prevent the water in the circulating flow from adhering as frost by allowing the circulating flow blown to this portion to pass through the portion of the blade end face facing the rotation direction without colliding. Also,
Even if the water in the circulating flow becomes frost and adheres to the portion of the impeller blade end face facing in the rotation direction, this frost is limited to the tip of the blade end face, which is a curved surface that is convex in the outer peripheral direction. Since it adheres only to a narrow area, the adhesion is weak, and when it grows to a certain extent, it is blown away by the circulation flow and hinders growth, so even if the ambient temperature of the blower becomes 0 ° C or less, it adheres to the blade end surface. You can prevent the frost from bloating.

Further, since the curved surface forming the impeller blade end surface is formed by mechanically processing the blade formed of a thin metal plate, the curved surface forming the impeller blade end surface is cut. In addition to being mechanically formed by grinding or the like, it is possible to prevent moisture in the circulating flow from adhering as frost to the portion of the blade end face of the impeller facing the rotational direction. Further, even if water in the circulation flow becomes frost and adheres to the portion of the impeller vane end surface facing the direction of rotation, the frost can be prevented from expanding.

Further, since the curved surface forming the impeller blade end surface is formed of a coating material containing a coating material, which coats the surface of the core of the blade formed of a thin metal plate,
By simply coating the core of a blade formed from a thin metal plate with a coating material containing paint, the blade end surface can be easily made into a curved surface convex in the outer peripheral direction, and at the portion facing the rotational direction of the blade end surface of the impeller, It is possible to prevent the moisture in the circulation flow from becoming frost and adhering. Further, even if water in the circulation flow becomes frost and adheres to the portion of the impeller vane end surface facing the direction of rotation, the frost can be prevented from expanding.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing the structure of one embodiment of the showcase of the present invention, which is parallel to the axial direction of the rotary shaft of the impeller of the blade of the impeller, and FIG. 2 shows the showcase of the present invention. The structure of a different Example is shown, (A) is sectional drawing parallel to the axial length direction of the rotating shaft of an impeller of the blade of an impeller, (B) is a principal part enlarged view of (A), both are figures. The upper side of is the front side. Further, FIG. 3 is a cross-sectional view of a main part of the impeller blade parallel to the axial direction of the rotation axis of the impeller, showing a state of frost attached to the impeller blade end surface of FIG. 1. The upper side of the figure is the front side. Is. Further, FIG. 4 shows a configuration of a showcase to which the present invention is applied. (A) is a left-side longitudinal sectional view, (B) is an enlarged perspective view of an essential part of (A) seen from the front upper left, ) Is the front side on the right side of the drawing, and FIG. 5 is a perspective view showing the appearance of the impeller constituting the blower of FIG. The same or similar parts as in FIG. 6 are designated by the same reference numerals.

In FIGS. 1 to 5, reference numeral 1 is a case having an opening 2 which is opened to the front and which is opened to a large extent to display and display products inside. The case 1 is composed of a case body 3 which is formed of a heat insulating wall and has both front and left and right side surfaces open, and side plates 4 which cover the left and right side surface openings of the case body 3. In the case 1 formed of the side plate 4 and the case body 3, partition walls 5 having front and left and right side surfaces open are lined at intervals along the inner peripheral surface of the case body 3. The space surrounded by the case 1 and the partition wall 5 forms an air passage 6 having both ends open along both the upper and lower edges of the opening 2, and the opening surfaces of the both ends of the air passage 6 are vertically arranged. The openings facing each other form a blow-out port 7 and a suction port 8, respectively. The upper opening of the suction port 8 is formed by arranging a plurality of ventilation holes 9 on the left and right sides at the upper end of the front end of the lower part of the partition wall 5, and the lower surface opening of the air outlet 7 is covered by the rectifying body 10. Is the same as the above-mentioned conventional example.

An evaporator 11 and an axial flow type blower 25 in FIG. 1 and a blower 26 in FIG.
With the blowers 25 and 26 on the front side and are installed in parallel in the front and rear. The blowers 25, 26 are fixed to the electric motor 13, the shaft end of the rotary shaft 14 of the electric motor 13, and in FIG. 1, an impeller 27 formed of a thin plate of aluminum, and FIG.
In this case, a core 28 formed of an aluminum thin plate and an impeller 30 in which a coating material 29 which is a synthetic resin-based coating material is applied are included. The impellers 27 and 30 are integrally formed with four blades 31 and 32 by press working. The end surfaces 33 and 34 of the four blades 31 and 32 are respectively machined to the end surface 33 by grinding. By coating the core 28 with the coating material 29 which is a paint to form the end faces 34, respectively, thereby forming convex curved surfaces 35 and 36 in the outer peripheral direction of the blades 31 and 32, respectively. This curved surface 35,
36 has blades 31 whose cross section parallel to the axial direction of the rotary shaft 14
A curved line that is convex in the outer peripheral direction of 32 and that is substantially perpendicular to the axial direction of the rotary shaft 14 is also a curved line.

On the other hand, on the front side of the evaporator 11, a partition member 19 for partitioning the inner bottom of the ventilation passage 6 into front and back is arranged on the front side, and the partition member 19 is blown by the blowers 25 and 26. Ventilation holes 20 are formed to allow the air flowing in the ventilation path 6 to pass therethrough. The impellers 27 and 30 are inserted into the ventilation holes 20 to separate the blowers 25 and 26 from the partition member 19 respectively.
The case 1 has a plurality of display shelves 21
Are vertically arranged and the rear ends thereof are cantilevered on the vertical wall surfaces of the partition wall 5 on the depth side, and the other configurations are the same as those of the conventional example described above.

In the above-mentioned structure, the showcase of the present invention has the blowers 25 and 26 having the impellers 27 and 30 having the blades 31 and 32 shown in FIG. 1 and FIG. The behavior of the air sucked into the air will be described below. The air sucked into the ventilation passage 6 by the blowers 25 and 26 from the suction port 8 is cooled by the evaporator 11 and becomes cold air, and a part of the air is rectified by the rectifying body 10 and blown out as a laminar flow. An air curtain 22 that covers the opening 2 is formed to keep the inside of the case 1 cool. Another part flows into the case 1 to cool the products displayed and displayed in the case 1,
A circulation flow 23 that is sucked again from the suction port 8 and circulates is formed. Further, the impeller 2 sprayed by the circulating flow 23
Four wings 31, 32 integrally formed on 7, 30
The end faces 33, 34 of the impeller 2 of the end faces 33, 34
The blades 31 and 32 are formed by curved surfaces 35 and 36 that are convex curved surfaces in the outer peripheral direction including the portions of the blades 7 and 30 that face the rotational direction.

Therefore, the blades 31, 3 of the impellers 27, 30 are
It is possible to prevent the water in the circulation flow 23 from adhering as frost by allowing the circulation flow 23 blown to the end faces 33 and 34 of the second end to pass in the rotation direction without colliding with the portion. . Further, even if the water in the circulation flow 23 becomes frost 24 and adheres to the portions of the end faces 33, 34 of the blades 31, 32 of the impellers 27, 30 facing in the rotation direction, the frost 24
As shown in FIG. 3, since it adheres only to a limited narrow range of the tip ends of the end faces 33, 34, it has a weak adhesive force and is blown off by the circulation flow 23 when it grows to some extent. This hinders the growth of the frost 24, so that the blowers 25, 26
The frost 24 attached to the end surfaces 33 and 34 of the blades 31 and 32 does not become large even if the ambient temperature of the blades becomes 0 ° C. or less.

Therefore, the flow rate of the circulation flow 23 is changed to lower the cooling performance in the case 1, or the frost 24 adhered to the end faces 33 and 34 and enlarged is adjacent to the impellers 27 and 30. It does not generate noise when it comes into contact with.

[0024]

According to the present invention, a product formed in a case formed of a heat insulating wall, in which a product is refrigerated or frozen and stored and displayed for display, and the front surface or the upper surface is opened, the front surface or the upper surface opening of the case is formed. , A pair of air outlets and inlets that open respectively along the upper and lower edges or the front and rear edges facing each other are provided in pairs in the ventilation passages formed at both ends with the evaporator, and are sucked from the inlets. An impeller blade end surface of an axial-flow type blower that cools by an evaporator and becomes cool air that flows in the ventilation passage and blows air for cooling the product is formed by a curved surface that is convex in the outer peripheral direction of the blade. Therefore, it is possible to prevent the water in the circulating flow from forming frost and adhering to the part of the impeller blade end face facing the direction of rotation, and even if it is attached, the ambient temperature of the blower is 0 ° C.
Even if it becomes the following, it is possible to prevent the frost from expanding, and thereby, it is possible to prevent the cooling performance in the case from deteriorating and generating noise.

Further, the curved surface forming the impeller blade end surface is a curved surface formed by mechanically processing the blade formed of a metal thin plate or a core of the blade formed of a metal thin plate. The same effect as above can be obtained even with a curved surface formed of a coating material containing a coating material, which coats the surface.
As a result, even if the ambient temperature of the blower falls below 0 ° C,
Provide a quiet and quiet showcase with stable cooling performance regardless of the temperature inside the case, where frost does not adhere to the blade end surface of the impeller and enlarges, which reduces cooling performance and noise in the case. The effect of being able to be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a blade of an impeller, showing a structure of one embodiment of a showcase of the present invention, which is parallel to an axial direction of a rotation axis of the impeller.

2A and 2B show configurations of different embodiments of the showcase of the present invention, in which FIG. 2A is a sectional view of an impeller blade, which is parallel to the axial direction of the impeller rotating shaft, and FIG. Enlarged view of the main part of

FIG. 3 is a cross-sectional view of a main part of an impeller blade showing the state of frost adhering to the impeller blade end surface of FIG. 1, parallel to the axial direction of the impeller rotating shaft.

FIG. 4 shows a configuration of a showcase to which the present invention is applied, where (A) is a left-side longitudinal sectional view, (B) is an enlarged perspective view of a main part of (A) seen from the front upper left.

5 is an external view of an impeller forming the blower of FIG. 4,
Perspective view from the front oblique

FIG. 6 shows a state of frost adhering to the end surface of an impeller blade of a conventional showcase, (A) and (B) of the impeller blade,
Sectional view parallel to the axial direction of the rotary shaft of the impeller, (C) showing the appearance of the impeller, perspective view seen from the lower front

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 case 2 opening 3 case body 4 side plate 5 partition wall 6 ventilation path 7 air outlet 8 suction port 9 ventilation hole 10 rectifier 11 evaporator 12 blower 13 electric motor 14 rotary shaft 15 impeller 16 blade 17 end surface 18 curved surface 19 ventilation member 20 Hole 21 Display Shelf 22 Air Curtain 23 Circulating Flow 24 Frost 25 Blower 26 Blower 27 Impeller 28 Core 29 Covering Material 30 Impeller 31 Blade 32 Blade 33 End Face 34 End Face 35 Curved Surface 36 Curved Surface

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G10K 11/16 // F25D 17/06 304 8511-3L

Claims (3)

[Claims] 1. A case formed by a heat insulating wall in which a commodity is refrigerated or frozen stored for display and displayed, and a front surface or an upper surface is opened, and the front surface or the upper surface opening of the case is opposed to each other. An evaporator and an axial-flow blower are provided in a ventilation passage formed at both ends with a blow-out port and a suction port opening along the edge or both front and rear edges, respectively, and the blower blows air to cool the evaporator. In a showcase that cools the product with air that is cold air that is sucked in from the suction port and flows in the ventilation passage, the impeller blade end surface of the blower is formed with a curved surface that is convex in the outer peripheral direction of the blade. And showcase. 2. The showcase according to claim 1, wherein the curved surface forming the impeller blade end surface is formed by mechanically processing the blade formed of a thin metal plate. 3. The showcase according to claim 1, wherein the curved surface forming the end surface of the impeller blade is formed of a coating material containing a coating material, which coats the surface of the core of the blade formed of a thin metal plate. Showcase.