JP2016120012A - Blower device and freezing and refrigerating showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower device of a freezing and refrigerating show case which can peel frost accumulated on a blade efficiently by utilizing action of centrifugal force by rotation of a fan blade even when the frost is formed and accumulated on a vane, and to provide a freezing and refrigerating show case including the blower device.SOLUTION: A vane 140 of a fan blade 120 of a blower device is formed by an outer peripheral edge 170 and two edges 150 and 160 extended from a center rotation part to the peripheral edge. In the vane, the front edge 150 positioned on a front side in rotation is formed such that a front edge part 150a on the outer peripheral edge side extended to the outer peripheral edge is positioned on the front side in rotation with respect to a virtual radial line r passing the center of a rotation shaft of the center rotation part and a cross point of a corner part defined by the front edge and the outer peripheral edge, and an angle formed by the front edge part and the virtual radial line is an acute angle.SELECTED DRAWING: Figure 3

Description

  The present invention is, for example, disposed in a ventilation path in a freezer / refrigeration showcase body and forms an air curtain in the freezer / refrigeration room of the freezer / refrigeration showcase, so that the cool air is circulated between the ventilation path and the freezer / refrigeration room. The present invention relates to a blower device and a freezer / refrigeration showcase used for the above.

  For example, in a cold-air circulation type freezer / refrigerated showcase such as an open flat type showcase, a reach-in type showcase, and an open-and-reach-in type showcase, the cold storage and display in the freezer / refrigeration room (display room) of the showcase are performed. The cold product is kept cold by operating the cooling device and the air blower and circulating the cold air throughout the showcase during the cold holding operation. Specifically, by operating a cooling device and a blower device arranged in a ventilation path defined between the outer box and the inner box of the showcase body, a cold air outlet in the refrigerated showcase is operated. The cold air is blown into the freezer compartment, and the blown cold air is again sucked into the ventilation path in the showcase body from the cold air inlet, thereby forming an air curtain in the freezer compartment. The warm air in the surrounding environment is prevented from flowing into the freezer compartment, thereby achieving a cold state in the freezer compartment.

However, the air flow of the air curtain is disturbed by, for example, opening / closing of the door of the refrigerated showcase or contact with the human body when putting in / out the product to / from the refrigerated showcase, In addition, air containing moisture is easily inhaled from the surrounding environment. When this moisture adheres to the blades of the fan blades of the blower, there is a tendency that frost is formed on the front edge of the blades and frost is formed. This tendency is particularly seen in the shape of the blades in the rotation direction R (the arrow direction shown in FIG. 1) extending from the outer peripheral edge 70 to the outer peripheral edge 70 like the fan blade 20 shown in FIG. This is notable in the blades 40 defined by the front end edge 50 extending in the rotation direction R located on the front side and the rear end edge 60 located on the rear side in the rotation direction R. The frost formed on the front edge 50 of the blade 40 having such a shape may accumulate until the gap with the adjacent blade 40 on the front side in the rotational direction is closed with the passage of the operation time of the blower. In such a case, the flow of the circulating cold air (air) is hindered, and the air flow rate is greatly reduced, so that the cooling effect may not be sufficiently exhibited.

  Also, it is not always guaranteed that the frost on the blades is evenly formed on the individual blades of the fan blades, and the center of gravity of the fan blades is decentered due to the frost that accumulates on the fan blades. It may interfere with the rotation of the fan blades and may cause an operational failure of the blower. For this reason, it is necessary to periodically perform a defrosting operation on the blades.

  In the fan blade defrosting operation, the cooling operation is stopped, the air flowing using a heat source such as an electric heater is heated, and the fan blade is rotated to melt the frost adhering to the blades to remove the defrost. However, in this method, high-temperature and high-humidity air generated in accordance with the defrosting operation is supplied to the freezer compartment, and condensation occurs on the wall surface of the refrigerator compartment and the surface of the displayed product. The water droplets due to the condensation cause freezing or frosting when the cold insulation operation is started again. As a result, the appearance of the showcase and the product is deteriorated, and the quality of the product is deteriorated in the long term. Therefore, it is desirable to reduce the number of times of defrosting work for frost attached to the fan blade, and ideally, defrosting is performed without stopping the cold insulation operation.

Therefore, the present applicant, in Patent Document 1, provided a water repellent layer on the surface of the blade of the blower,
Adopting a structure that makes it difficult for moisture that causes frost formation, which is contained in air containing cold air flowing through the ventilation path, to adhere to the blades, it is possible to eliminate the need for periodic defrosting A frost-preventing fan was proposed. The frost prevention blower fan described in Patent Document 1 has a water-repellent layer formed on the surface of the blade, and thus can prevent moisture from adhering to the blade and suppress frost formation. After manufacturing the fan blade, it was necessary to coat the fan blade with a water repellent layer, and there was room for improvement in terms of material cost and workability.

JP 11-2111327 A

  The object of the present invention is to optimize the fan blades constituting the air blower, so that even if frost is formed on the blades and frost is accumulated, the fan blades are used to rotate the fan blades by utilizing the centrifugal force. An object of the present invention is to provide a blower for a frozen and refrigerated showcase capable of effectively separating accumulated frost, and a frozen and refrigerated showcase including the blower.

  In order to achieve the above object, the gist of the present invention is as follows.

  (1) comprising a showcase body composed of an outer box and an inner box, and having a freezing and refrigeration chamber in which an open space opened outward is formed on the outer surface side of the inner box of the showcase body; A ventilation path is formed in a space defined by the outer box and the inner box, and a blower for forcibly flowing the taken-in air in one direction in the ventilation path, and cooling the cooled air by cooling the flowing air. A cooler that cools the air, and blows out the cool air generated by the cooler into the open space in the freezer compartment, forms a cool air curtain in the open space, and includes the cool air that forms the air curtain. A blower for a refrigerated showcase of a type in which air is taken into the ventilation path again and the air circulates in the ventilation path and the freezer / refrigeration room, and the blower is rotated by a motor. Removably connected to the shaft A fan blade having a central rotating portion and a plurality of blades extending outward from an outer periphery of the central rotating portion, the blade including an outer peripheral edge and two end edges extending from the central rotating portion to the outer peripheral edge; The two edges, that is, a front edge located on the front side when the fan blade is rotated and a rear edge located on the rear side when the fan blade is rotated in the plan view of the fan blade The front edge is a virtual radius line through which the outer edge side front edge portion extending to the outer edge passes through the intersection of the corner defined by the front edge and the outer edge, with the rotation axis of the central rotating portion as the center. On the other hand, an air blower characterized in that an angle formed between the front edge portion of the outer peripheral edge and the front edge portion at the time of rotation is an acute angle with the virtual radius line.

  (2) In the blade, the extending shape of the front end edge extends inclined toward the surface side toward the outer peripheral edge with respect to a virtual plane including the surface of the central rotating portion, and the blade extends from the front end edge. The blower device according to (1) above, wherein the extending shape toward the rear end edge extends while inclining in a direction crossing the virtual plane.

  (3) The blade is composed of two parts, a front side part including the front end edge and a rear side part including the rear end edge, and an inclination angle of the blade with respect to a virtual plane including the surface of the central rotating part. The air blower according to (1) or (2), wherein the rear side portion is larger than the front side portion.

  (4) The blade according to (1), (2), or (3), wherein a notch is formed in a remaining portion of the front end edge excluding the front end edge portion on the outer peripheral edge side. Blower device.

  (5) The air blower according to any one of (1) to (4), wherein the blade is an integrally formed product made of a metal plate material.

  (6) comprising a showcase body composed of an outer box and an inner box, and having a freezing and refrigeration chamber in which an open space opened outward is formed on the outer surface side of the inner box of the showcase body, A ventilation path is formed in a space defined by the outer box and the inner box, and a blower for forcibly flowing the taken-in air in one direction in the ventilation path, and cooling the cooled air by cooling the flowing air. A cooler that cools the air, and blows out the cool air generated by the cooler into the open space in the freezer compartment, forms a cool air curtain in the open space, and includes the cool air that forms the air curtain. A refrigerating and refrigeration showcase of a type in which air is taken into the ventilation path again and the air circulates in the ventilation path and the freezing and refrigeration chamber, and the blower is attached to and detached from the rotating shaft of the motor. Central rotating parts connected to each other A fan blade having a plurality of blades extending outward from the outer periphery of the central rotating portion, and the blades are defined by an outer peripheral edge and two end edges extending from the central rotating portion to the outer peripheral edge. In the plan view of the fan blade, of the two end edges, a front end edge that is one end located on the front side when the fan blade rotates is an outer peripheral side front end edge portion that extends to the outer peripheral edge. , With respect to a virtual radial line that passes through the intersection of the corner defined by the front end edge and the outer peripheral edge with the rotation axis of the central rotating part as the center, and located on the front side during the rotation, and on the outer peripheral edge side The freezing and refrigeration showcase characterized in that the angle between the front edge portion and the virtual radius line is an acute angle.

  According to the present invention, the fan comprises a central rotating part that is detachably connected to the rotating shaft of the motor, and a plurality of blades extending outward from the outer periphery of the central rotating part. Rotation of the fan blade is defined by two end edges extending from the central rotating portion to the outer peripheral edge, and in the plan view of the fan blade, the two end edges, that is, the front end edge located on the front side when the fan blade rotates Of the rear edges that are sometimes located on the rear side, the front edge is the intersection of the corners defined by the front edge and the outer edge, with the front edge part of the outer edge extending to the outer edge centering on the rotation axis of the central rotating part It is located on the front side at the time of rotation with respect to the imaginary radius line passing through and the outer edge side front end edge part forms an acute angle with the imaginary radius line. Even a fan blade with a water repellent layer Therefore, the fan blades can be effectively delaminated using the centrifugal force by rotating the fan blades, so that the fan blades can be defrosted without stopping the cooling operation. As a result, continuous cold operation over a long time is possible.

FIG. 1 is a plan view of a conventional fan blade. FIG. 2 is a schematic cross-sectional view showing a configuration of a general freezer / refrigeration showcase. FIG. 3 is a plan view of an embodiment of a typical fan blade constituting the air blower of the present invention. FIG. 4 is a cross-sectional view of the fan blade shown in FIG. FIG. 5 is an end view on the line II-II of the fan blade shown in FIG. FIG. 6 is a plan view of another embodiment of a fan blade. FIG. 7 is an example of a diagram in which the wind speed by rotation of the fan blades arranged in the refrigerated showcase is plotted with respect to the operation time during the cold insulation operation, and the fan blade (present invention) shown in FIG. The result performed with the fan blade (conventional product) shown in FIG.

  Next, an embodiment of the fan blade 120 included in the air blower 100 according to the present invention will be described below with reference to the drawings.

3 is a plan view of a typical fan blade 120 included in the blower device 100 of the present invention, and FIG. 4 is a front end edge 150 side when the fan blade 120 of FIG. 3 is cut along the line II. FIG. 5 is a partial cross-sectional view of the blade 140 as viewed from FIG.
It is an end elevation which shows the relationship between the blade | wing 140 and the center rotation part 130 when cut | disconnecting on the -II line.

  The air blower 100 of the present invention is used for a freezer / refrigerated showcase 1, and the freezer / refrigerated showcase 1 is composed of an outer case 3 and an inner case 4 as shown in FIG. 2. 2 and has a freezing / refrigeration chamber 6 having an open space 5 opened outwardly on the outer surface side of the inner box 4 of the showcase body 2, and is defined by the outer box 3 and the inner box 4. A ventilation path 7 is formed in the remaining space. The air blower 100 is disposed in the ventilation path 7 together with a cooling device 8 such as an evaporator for cooling the taken-in air to cool it, and in order to keep the freezer refrigerator compartment 6 cool, the air is unidirectionally supplied. The cold air generated by the cooling device 8 is forced to flow and blown out into the opening space 5 in the freezer compartment 6, and a cold air curtain schematically shown by a broken line arrow is formed in the opening space 5. Refrigerated refrigerated showcase 1 of a system in which air containing cold air forming a curtain is taken into the ventilation path 7 again, and the air circulates in the ventilation path 7 and the freezer compartment 6 (indicated by solid arrows). Used in.

  The air blower 100 shown in FIG. 2 shows a case where it is arranged in an open flat type freezer / refrigerated showcase 1, but the air blower of the present invention is not limited to such a freezer / refrigerated showcase 1, but a reach-in type showcase, It can also be used in an open and reach-in showcase. Moreover, although the opening space 5 which enables the taking in / out of goods into the freezer compartment 6 is open | released directly with respect to the exterior, it may be closed by the closing member like a glass door so that opening and closing is possible, for example. . Further, the cooling device 8 extends with a predetermined length in the longitudinal direction of the showcase body 2.

  The illustrated blower 100 is accommodated in the fan panel 9 and disposed in the ventilation path 7 at the bottom of the showcase body 2. The fan panel 9 extends in the longitudinal direction of the showcase body 2 and preferably has a plurality of accommodating portions in the longitudinal direction so that a plurality of blower devices 100 are provided. As shown in the drawing, the arrangement of the blower 100 and the cooling device 8 is such that the blower 100 is arranged on the upstream side of the cooling device 8 as viewed in the direction of air flow. Depending on the mold of the showcase, the blower 100 can be disposed on the downstream side of the cooling device 8.

  As shown in FIG. 3, the blower device 100 is detachably connected to the rotation shaft of the motor 110 and a plurality of blades extending outward from the outer periphery of the central rotation unit 130, A fan blade 120 having three blades 140 is provided. The motor 110 serves as a driving device that rotates the fan blade 120. The central rotating portion 130 of the fan blade 120 is also called a hub. As shown in FIG. 3, a hole 131 for the rotating shaft of the motor 110 is formed at the center thereof, and the rotating shaft is connected to the fan 131 together with the fan blade 120. It is rotatably inserted and connected. There may be a plurality of blades 140 of the fan blade 120, and the number of blades 140 is three in the illustrated embodiment. However, the number is not limited thereto, and may be three or more. Further, the rotational speed of the motor 110 may be determined based on, for example, frequencies of 50 Hz and 60 Hz, or may be arbitrarily controlled.

  As can be seen from FIG. 3, the blade 140 is defined by an outer peripheral edge 170 and two end edges extending from the central rotating portion 130 to the outer peripheral edge 170. Of the two end edges, that is, the front end edge 150 positioned on the front side when the fan blade 120 rotates and the rear end edge 160 positioned on the rear side when the fan blade 120 rotates, the front end is a portion where frosting is likely to occur. At least the outer peripheral edge front end edge portion 150 a of the edge 150 extends until it reaches the outer peripheral edge 170.

The main feature of the configuration of the present invention is to optimize the fan blades constituting the air blower, and more specifically, the front edge of the blade 140 that tends to cause a frosting phenomenon. At least the outer peripheral side front end edge portion 150a of 150 is a virtual radius line r passing through the intersection 180 of the corner defined by the front end edge 150 and the outer peripheral edge 170 in plan view with the rotation axis 132 of the central rotating portion 130 as the center. In contrast, the outer edge side front end edge portion 150a is positioned at the front side during rotation, and the angle formed with the virtual radius line r is an acute angle. The frost that gradually grows after frosting on the edge 150 is caused by the weight of the frost itself, the wind pressure of the air taken in by the rotation of the fan blade 120, and the blades 140 on the outer side in the radial direction around the rotation axis 132. Based on the centrifugal force acting, the blade moves from the outer peripheral side front end edge portion 150a toward the outer peripheral edge 170 in the direction opposite to the rotation direction R (air flow direction) on the outer side in the radial direction and blown off from the blade 140. As a result, it is not necessary to perform the defrosting operation of the fan blade 120 with the air blower 100 stopped, or the number of executions can be reduced.

  As shown in FIG. 3, the front edge portion 150a on the outer peripheral edge side of the front edge 150 is a rotational direction schematically indicated by an arrow with respect to a virtual radius line r passing through the intersection 180 between the outer peripheral edge 170 and the front edge 150 in plan view. Projecting toward R, an acute angle of a predetermined angle θ is formed with the virtual radius line r. The value of the angle θ is variable in the range of 0 ° to 40 °, preferably 10 ° to 30 °, more preferably 15 ° to 20 °. In the illustrated fan blade 120, the direction in which the front edge 150 is directed from the central rotating portion 130 to the intersection 180 position with the outer peripheral edge 170 is opposite to the rotational direction R of the fan blade 120 with respect to the virtual radius line r. It is comprised so that it may become. Thereby, the centrifugal force acting on the blade 140 of the fan blade 120 is effectively used, and the frost that has formed on the front edge 150 is easily separated and removed from the front edge 150 toward the outside of the outer edge 170. can do.

  The illustrated front end edge 150 and rear end edge 160 are configured in a straight line shape, but may be configured in a curved shape. On the contrary, the outer peripheral edge 170 is configured in a curved shape, but may be configured in a linear shape. In addition, the corner defined by the front edge 150 and the outer peripheral edge 170 may be rounded.

  4, a part necessary for the description of the fan blade 120 shown in FIG. 3 is shown in a partial cross-sectional view taken along a line II in FIG. 3, and in FIG. 5, the fan blade 120 shown in FIG. Is shown in an end view taken along a line II-II in FIG. As can be seen from FIGS. 4 and 5, the blade 140 extends such that the extending shape of the front edge 150 is inclined toward the surface side 190 toward the outer peripheral edge 170 with respect to the virtual plane including the surface of the central rotating portion 130. Further, it is preferable that the extending shape from the front end edge 150 toward the rear end edge 160 is inclined and extends in a direction crossing the virtual plane. Thereby, when the air blower 100 of this invention is arrange | positioned at the bottom part of the showcase main body 2 shown in FIG. 2, air (including cold air) is made into the downstream of the air blower 100, and the bottom face of the showcase main body 2 The air can be sent out to the cooling device 8 after being diffused in the longitudinal direction of the showcase body 2.

The vane 140 is composed of two parts, a front side part 151 including the front end edge 150 and a rear side part 161 including the rear end edge 160, and as can be seen from FIG. 5, a virtual plane including the surface of the central rotating part 130. With respect to the inclination angle of the blade 140, the rear side portion 161 is larger than the front side portion 151. A fluid such as air is sucked in from the front edge 150 side, flows along the surface of the blade 140, and is blown out from the rear edge 160 side. As shown in FIG. 5, by forming the blade 140 with the front end edge 150 and the rear end edge 160 at different inclination angles as described above, the blower device 100 can be attached to the showcase body 2 as shown in FIG. 2. When provided at the bottom, the air sucked in the front side portion 151 that is gently angled with respect to the central rotating portion 130 passes through the rear side portion 161 that is suddenly angled with respect to the central rotating portion 130. The air that is accelerated toward the bottom surface of the showcase body 2 and strongly collides with the bottom surface and collides with the bottom surface of the showcase body 2 effectively diffuses in the longitudinal direction of the showcase body 2, It can send out to the cooling device 8 located in the downstream. The area ratio occupied by the front side portion 151 in the blade 140 is preferably larger than the area ratio occupied by the rear side portion 161.

  Further, by providing a height difference between the front end edge 150 and the rear end edge 160 of the blade 140, the front end edge 150 exists between the rear end edge 160 of another blade 140 on the front side in the rotation direction R. Therefore, even when frost forms on the front edge 150 of the blade 140 and the frost grows, a sufficient air flow path for the air that is allowed to flow by the blower 100 is ensured in the fan blade 120. In addition, it is advantageous in that it is possible to earn time until the frost accumulated on the front edge 150 of the blade 140 is separated and removed by centrifugal force.

  FIG. 6 shows an advantageous embodiment of a fan blade, where the same reference numerals are used for the same parts as the fan blade 120 shown in FIG. The blades 140 may have a notch 150c at the position of the remaining portion of the front edge 150 excluding the front edge portion 150a on the outer peripheral edge, that is, the front edge 150 in FIG. preferable. As can be seen from the advantageous embodiment of the fan blade 120A shown in FIG. 6, a notch 150c such as a recess is formed at the connection point between the front edge 150 of the blade 140 and the central rotating portion 130. With this configuration, a larger space can be formed between the blade 140 positioned on the front side in the rotation direction R as compared with the embodiment shown in FIG. 3, so that frost is formed in the notch 150 c of the front edge 150. Even if formed, it is possible to ensure a good air flow path between the blades 140 on the front side in the rotational direction R, and frost accumulated on the front edge 150 of the blades 140 is caused by centrifugal force. This is advantageous in that it also allows time to be separated and removed. Further, as can be seen from FIG. 6, the proportion of the notch 150c in the front edge 150 is clearly smaller than the proportion of the outer peripheral edge front edge 150a. The other configurations relating to the blades 140 are the same as the configuration of the blades 140 of the fan blade 120 shown in FIG.

  For example, as shown in FIG. 2, when the cooling device 8 is disposed downstream of the blower 100, the continuous air flow is performed by the continuous air flow to the cooling device 8. This is advantageous in that it suppresses the growth of frost in the cooling device 8.

  The fan blades 120 and 120A are preferably an integrally formed product made of a metal plate material, and the fan blade 120 can be manufactured by pressing, particularly punching, a thin metal plate. Can be reduced. Further, the material of the fan blades 120 and 120A is not particularly defined, but is preferably made of aluminum.

  Further, in the embodiment of the fan blades 120 and 120A shown in FIGS. 3 and 6, the rotation direction R is counterclockwise, but the back side of the fan blades 120 and 120A of the above embodiment is the front side, and the above The fan blades 120 and 120A with the rotation direction R being clockwise can be used by forming the front end edge 150 and the rear end edge 160 of the blades 140 of the embodiment into a shape that is symmetrical to the front and back.

  FIG. 7 shows the air blower 100 having the fan blade 120A and the air blower having the fan blade 20 shown in FIG. The graph showing the wind speed ratio change of is shown. The vertical axis represents the wind speed ratio (%), and the horizontal axis represents the operating time (minutes) of the blower. “Wind speed ratio (%)” means a predetermined value after the start of the experiment with respect to a measured value obtained by measuring the wind speed sent out by the blower 100 at a predetermined position on the downstream side of the blower 100 at the start of the blowing operation. Percentage of wind speed value measured over time. In FIG. 7, “100%” is a state where the fan blades 120A and 20 have no frost formation.

  As can be seen from the graph of FIG. 7, the wind speed ratio by the conventional fan blade 20 gradually decreases as the operating time elapses, and the wind speed ratio at the end of the experiment is about 44%, which is higher than the initial wind speed ratio. It can be seen that it is 1/2 or less. On the other hand, in the case of the fan blade 120A according to the present invention, it can be seen that the wind speed ratio with respect to the initial wind speed is maintained substantially at about 90% through the experiment.

  The gradual decrease in the wind speed ratio in the conventional fan blade 20 is caused by the centrifugal force acting on the outer peripheral side of the front edge 50 of the blade 40 in the conventional fan blade 20 shown in FIG. It was difficult to use for defrosting, and frost grew with the passage of time by the air blowing operation, and the space between the front edge 50 and the blade 40 on the front side in the rotation direction R was narrowed by frost. It is a result. This is due to the shape of the blades 40 of the conventional fan blade 20. This is because, as shown in FIG. 1, the front end edge 50 has a shape extending from the lower side of the virtual radius line r toward the outer peripheral edge 70 when viewed from the central rotating portion 30 side. . In this shape, the frost formed on the front edge 50 tries to move toward the outer peripheral edge 70 using centrifugal force, but the movement is in a direction against the wind pressure of the air taken in by the fan blade 20. Thus, the frost is deposited without substantially moving the frost toward the outer peripheral edge 70. On the other hand, in the fan blades 120 and 120A of the present invention, as can be seen from FIGS. 3 and 6, the outer peripheral side front end edge portion 150a of the front end edge 150 faces the upper peripheral edge 170 on the upper side of the virtual radius line r. It is extended. Due to this shape, the fan blades 120 and 120A of the present invention utilize the centrifugal force acting on the fan blades 120 and 120A, without causing the frost formed on the front edge 150 to oppose the wind pressure of the air taken in by the fan blade 20. Thus, it can easily move to the outer peripheral edge 170 and can finally be blown off from the blade 140.

  Furthermore, the present invention relates to a refrigerated showcase comprising the blower 100. The component type of the refrigerated showcase is not particularly defined, but may be an open type showcase, a reach-in type showcase, and an open and reach-in type showcase.

  According to the present invention, even if frost is formed on the blade and the frost is accumulated, the frost accumulated on the blade by utilizing the action of centrifugal force by the rotation of the fan blade without forming a water repellent layer on the fan blade. The fan blade can be defrosted without stopping the cooling operation without stopping the cooling operation, and it can be used for continuous freezing operation for a long time. The device can be provided.

DESCRIPTION OF SYMBOLS 1 Refrigerated refrigeration showcase 2 Showcase main body 3 Outer box 4 Inner box 5 Open space 6 Refrigerated refrigerator compartment 7 Ventilation path 8 Cooling device 9 Fan panel 20 Fan blade 30 Central rotation part 40 Blade 50 Front edge 60 Rear edge 70 Outer edge DESCRIPTION OF SYMBOLS 100 Blower 110 Motor 120 Fan blade 120A Fan blade 130 Central rotation part 131 Hole (for motor rotation shafts) 132 Rotation axis 140 Blade 150 Front edge 150a Outer peripheral edge side front edge part 150b Central rotation part side front edge part 150c Notch 151 Front side portion 160 Rear end edge 161 Rear side portion 170 Outer peripheral edge 180 Intersection 190 Front side 200 Back side R Rotational direction r Virtual radius line

Claims (6)

It has a showcase body consisting of an outer box and an inner box,
On the outer surface side of the inner box of the showcase body, it has a freezing and refrigeration chamber in which an open space opened outward is formed,
Forming a ventilation path in a space defined by the outer box and the inner box;
A blower for forcibly flowing the taken-in air in one direction in the ventilation path, and a cooling device for cooling the flowing air to cool it,
Cold air generated by the cooling device is blown out into the open space in the freezer compartment to form an air curtain of cold air in the open space,
The blower of the refrigerator-freezer showcase of the type in which the air containing the cold air forming the air curtain is taken into the ventilation path again and the air circulates in the ventilation path and the freezing / refrigeration chamber. And
The blower device includes a fan blade having a central rotating portion that is detachably connected to a rotating shaft of a motor, and a plurality of blades extending outward from the outer periphery of the central rotating portion,
The blade is defined by an outer peripheral edge and two end edges extending from the central rotating portion to the outer peripheral edge,
In plan view of the fan blade,
Out of the two end edges, that is, the front end edge positioned on the front side when the fan blade rotates and the rear end edge positioned on the rear side when the fan blade rotates, the front end edge extends to the outer peripheral edge. A front end edge portion is located on the front side at the time of rotation with respect to a virtual radius line passing through an intersection of corners defined by the front end edge and the outer peripheral edge with the rotation axis of the central rotation portion as the center, and An air blower characterized in that an angle formed by the front edge portion on the outer peripheral edge side and the virtual radius line is an acute angle.   The extending shape of the front edge extends obliquely toward the surface side toward the outer peripheral edge with respect to a virtual plane including the surface of the central rotating portion, and the blades extend from the front edge to the rear edge. The air blower according to claim 1, wherein an extending shape toward the side extends in a direction that crosses the virtual plane. The blade is composed of two parts, a front side part including the front edge and a rear side part including the rear edge,
The blower according to claim 1 or 2, wherein the rear side portion has a larger inclination angle of the blade with respect to a virtual plane including the surface of the central rotating portion than the front side portion.   The blower according to claim 1, 2, or 3, wherein the blade is formed with a notch in a remaining portion of the front end edge excluding the front edge portion on the outer peripheral edge side.   The blower according to any one of claims 1 to 4, wherein the fan blade is an integrally molded product made of a metal plate material. It has a showcase body consisting of an outer box and an inner box,
On the outer surface side of the inner box of the showcase body, it has a freezing and refrigeration chamber in which an open space opened outward is formed,
Forming a ventilation path in a space defined by the outer box and the inner box;
A blower for forcibly flowing the taken-in air in one direction in the ventilation path, and a cooling device for cooling the flowing air to cool it,
Cold air generated by the cooling device is blown out into the open space in the freezer compartment to form an air curtain of cold air in the open space,
The air containing the cold air forming the air curtain is again taken into the ventilation path, and the air is refrigerated and refrigerated showcase in which the air circulates in the ventilation path and the freezing and refrigeration chamber,
The blower device includes a fan blade having a central rotating portion detachably connected to a rotating shaft of a motor, and a plurality of blades extending outward from the outer periphery of the central rotating portion,
The blade is defined by an outer peripheral edge and two end edges extending from the central rotating portion to the outer peripheral edge,
In plan view of the fan blade,
Of the two end edges, the front end edge that is one end located on the front side during rotation of the fan blade has an outer peripheral side front end edge portion that extends to the outer peripheral edge, with the rotation axis of the central rotating portion being the center. And an imaginary radius line passing through an intersection of corners defined by the front edge and the outer edge, and located on the front side during the rotation, and the outer edge side front edge portion and the imaginary radius line. A freezing and refrigeration showcase characterized in that the angle formed is an acute angle.

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