WO2017138138A1

WO2017138138A1 - Fan and refrigerator

Info

Publication number: WO2017138138A1
Application number: PCT/JP2016/054095
Authority: WO
Inventors: 和貴鈴木; 大矢　恵司; 誠岡部
Original assignee: 三菱電機株式会社
Priority date: 2016-02-12
Filing date: 2016-02-12
Publication date: 2017-08-17
Also published as: JPWO2017138138A1; JP6529613B2; CN206668628U

Abstract

This fan comprises: a fan section provided with an impeller which has a plurality of blades and a casing which accommodates the impeller and in which an air channel through which an air current flows is formed; and an attachment section open from an air discharge side surface to an air intake side surface and provided with an opening for accommodating the fan section. An opening end of the opening of the attachment section, the opening end being located on the air discharge side surface, and the air discharge outlet of the air channel in the casing, the air discharge outlet being provided in the air discharge side surface, have the same size. The height of the air discharge side surface of the attachment section measured to the air discharge side in the rotation axis direction of the impeller is greater than the height of the position of the opening end measured at the position of the outer peripheral end of a radial outer peripheral surface, and is smaller than the height of a plane formed by connecting the opening end and the outer peripheral end.

Description

Fan and refrigerator

The present invention relates to a fan that blows air and a refrigerator that includes the fan.

Conventionally, some fans that blow air by rotating an impeller or the like are installed in a building and used as a ventilation fan that ventilates the building. Some fans are used as cooling fans that are mounted on equipment and cool the inside of the equipment.

On the other hand, some conventional electronic devices or home appliances have a heating element inside. In order for such a device to operate normally or stably, the temperature inside the device needs to be controlled. If the temperature in the device is not sufficiently controlled, the device function of the device may not be exhibited. For this reason, there are electronic devices or home appliances that control the heat dissipation of a heating element that is installed inside with a fan.

For example, home refrigerators are mainly used to obtain a cooling effect by operating an electric compressor, but are often operated for a long time without shutting off the power supply. The compressor is controlled to start and stop by the temperature inside the refrigerator, which is detected by the temperature sensor provided in the refrigerator. Especially on days when the outside air temperature is high, the compressor operation time is lengthened to cool the inside of the refrigerator. Or control to increase the rotation speed. For this reason, the load of the compressor increases, and the temperature of the compressor rises during long-term use, thereby reducing the reliability of the refrigerator. Thus, a conventional refrigerator is disclosed in which a fan is attached to a machine room in which a compressor is installed to cool the compressor (see, for example, Patent Document 1).

Also, it is desirable to improve the fan air volume so that sufficient cooling or ventilation is performed. Therefore, a conventional fan mounted on an electronic device is disclosed in which the wind tunnel portion of the casing portion is formed so that the distance from the rotation shaft gradually increases as it goes from the intake port to the exhaust port. (For example, refer to Patent Document 2).

JP 2003-004360 A International Publication No. 2009/139023

In the fan, the wind loses energy due to resistance when passing through the fan or the surrounding structure where the fan is installed (pressure loss). In order for the fan to perform the cooling or ventilation function, it is necessary to reduce the pressure loss and to secure the air volume and the air speed. While the fan is in operation, the fan mainly blows air in the direction of the rotation axis of the fan, but also blows air in the direction perpendicular to the rotation axis of the fan. The wind blown in the vertical direction collides with the wall, and after the collision, a vortex is generated around the wall to cause convection. Therefore, there is a problem that the fan cannot exhibit the cooling effect when convection occurs. In addition, when a boss for protecting the blades is provided on the path of the blown wind, for example, the blown wind and the boss collide in a direction perpendicular to the rotation axis of the fan to cause pressure loss and noise. May have occurred.

The present invention has been made in order to solve the above-described problems, and obtains a fan having a cooling or ventilation function and noise reduced by suppressing a pressure loss during operation and a refrigerator including the fan.

A fan according to the present invention includes a fan part including an impeller having a plurality of blades and a casing formed with a wind tunnel that accommodates the impeller and allows air flow to be opened from an exhaust side to an intake side. An opening provided on the exhaust side of the opening of the attachment and the exhaust outlet on the exhaust side of the wind tunnel of the casing, the opening having the same size, The exhaust side surface of the attachment portion has a height to the exhaust side in the rotational axis direction of the impeller that is higher than the position of the opening end at the position of the outer peripheral end of the radially outer peripheral surface, and extends from the opening end to the outer peripheral end. It is more concave than the connected plane.

According to the present invention, the exhaust side surface of the fan attachment portion is configured such that the height toward the exhaust side in the rotation axis direction is higher at the position of the outer peripheral end than the opening end. The collision between the blown wind and the surrounding structure is alleviated and the pressure loss is reduced. As a result, the air flow of the fan is secured, so that the ventilation volume of the target space can be increased as a ventilation fan, and the cooling fan prevents the temperature inside the device from rising due to heat dissipation from the heating element. Reliability can be maintained. Moreover, since the pressure loss is reduced, a device or an indoor environment with reduced noise is provided.

It is a front view of the refrigerator which concerns on Embodiment 1 of this invention. It is a schematic sectional side view of the refrigerator which concerns on Embodiment 1 of this invention. It is a schematic back view of the refrigerator which concerns on Embodiment 1 of this invention. It is a schematic sectional side view of the machine room of the back surface of the refrigerator which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the flow of the air of the machine room of the refrigerator which concerns on Embodiment 1 of this invention. It is the schematic of the machine room of the refrigerator which concerns on Embodiment 1 of this invention. It is a perspective view of the compressor cooling fan which concerns on Embodiment 1 of this invention. It is a side view of the compressor cooling fan which concerns on Embodiment 1 of this invention. It is a perspective view of the fan part which concerns on Embodiment 1 of this invention. It is a simplified diagram of the compressor cooling fan tangent to the machine room wall surface according to Embodiment 1 of the present invention. It is a simplified view of the intake side of the compressor cooling fan according to the first embodiment of the present invention.

Embodiment 1 FIG.
Hereinafter, a fan according to Embodiment 1 of the present invention and a refrigerator including the fan will be described.
FIG. 1 is a front view of a refrigerator 1 according to Embodiment 1 of the present invention. The refrigerator 1 includes a refrigerator room 100, a switching room 200, an ice making room 300, a freezer room 400, and a vegetable room 500. The refrigerator compartment 100 is disposed with an open / close door at the top. The switching chamber 200 is a drawer that can be switched from the freezing temperature zone (−18 ° C.) to the freezing temperature (−3 ° C.), chilled (0 ° C.), soft freezing (−7 ° C.), etc. It has a door. The ice making chamber 300 includes a drawer door arranged in parallel with the switching chamber 200. The freezer compartment 400 includes a drawer door disposed below the switching chamber 200 and the ice making chamber 300. The vegetable compartment 500 is provided with a drawer door arranged at the bottom.
Regardless of this, the form of the refrigerator 1 is not particularly limited to the form of the refrigerator 1 such as those without the switching room 200 and ice making room 300, and those having the freezer room 400 and the vegetable room 500 reversed in position.

FIG. 2 is a schematic sectional side view of the refrigerator 1 according to Embodiment 1 of the present invention. The refrigerator 1 has a refrigerant circuit in which a compressor 2 and a cooler 3 are connected by piping, and cools the inside of the refrigerator by circulating the refrigerant. In addition to the compressor 2 and the cooler 3, the refrigerator 1 introduces the cool air cooled by the cooler 3 to each room in the refrigerator and the cool air cooled by the cooler 3 into each room. The air path 5 is provided. The cool air cooled by the cooler 3 passes through the air passage 5 and is blown to the freezer compartment 400, the switching chamber 200, the ice making chamber 300, and the refrigerator compartment 100 to cool each room. The vegetable room 500 is cooled by circulating the return cold air from the refrigerating room 100 from the return air passage for the refrigerating room. And the air which left the vegetable compartment 500 is returned to the cooler 3 from the return air path for vegetable rooms (a return air path is not shown). The temperature of each room is detected by a thermistor (not shown) installed in each room. The detected temperature is controlled by adjusting the opening degree of a damper (not shown) installed in the air passage 5, the capacity of the compressor 2, and the air flow rate of the blower fan 4 so that the detected temperature becomes a preset temperature. The

The freezer compartment 400 is provided with a freezer compartment storage case 401 and can store foods and the like. A switching chamber storage case 201 is installed in the switching chamber 200 and can store food and the like. A vegetable room storage case 501 is installed in the vegetable room 500 and can store food and the like. The number of cases in each room may be one, but there may be two or more cases when the capacity of the entire refrigerator 1 improves the organization.

FIG. 3 is a schematic rear view of the refrigerator according to Embodiment 1 of the present invention. A control room in which a control board or the like is disposed is provided above the back side of the refrigerator 1, and the back surface of the control room is covered with a control board cover. Moreover, a handle for transportation is provided on both sides of the control board cover so that it can be easily carried. A machine room 50 is provided below the back side of the refrigerator 1, and the back surface is covered with a machine room cover 51. The machine room cover 51 has a large number of air holes and is configured to discharge heat from the compressor 2 installed in the machine room 50.

FIG. 4 is a schematic sectional side view of the machine room at the back of the refrigerator according to Embodiment 1 of the present invention. The machine room 50 is surrounded by the base plate 10, the outer plate 11, and the machine room cover 51. That is, the outer plate 11 constitutes the upper surface, front surface, and side surfaces of the machine room 50, the base plate 10 constitutes the bottom surface of the machine room 50, and the machine room cover 51 constitutes the rear surface of the machine room 50. A heat insulating layer 9 is provided in front of and above the machine room 50 between the outer plate 11 and a vegetable room in the refrigerator. The heat insulation layer 9 blocks heat transfer between each room in the refrigerator and the machine room 50.

Further, the compressor cooling fan 40 according to Embodiment 1 of the present invention is attached to the machine room 50 so as to divide the space of the machine room 50 into two. The compressor cooling fan 40 cools the compressor and the like, and includes a fan part 41 including blades and an attach part 42 that constitutes an outer frame of the compressor cooling fan 40 and accommodates the fan part 41. The compressor cooling fan 40 is installed such that a radially outer peripheral surface of the attachment unit 42 in a direction perpendicular to the rotation axis direction of the fan faces a wall surface of the machine room. Specifically, the attachment part 42 is screwed perpendicularly to the wall surface of the machine room via a fixing part (not shown) provided in the attachment part 42. In addition, an elastic outer peripheral seal portion 44 is affixed to the radially outer peripheral surface of the attach portion 42, and when the compressor cooling fan 40 is attached to the machine chamber 50, the machine chamber wall surface, the outer peripheral seal portion 44, Is in close contact. Except for the fan portion 41, the intake side and the exhaust side of the compressor cooling fan 40 are separated, and the flow of air is blocked. By using the outer peripheral seal portion 44, vibration generated by the operation of the compressor cooling fan 40 can be prevented from propagating to the outer peripheral wall of the machine room 50. The machine room wall surface specifically indicates the base plate 10, the outer plate 11, and the machine room cover 51, and corresponds to the “wall surface” in the present invention.

FIG. 5 is a schematic diagram showing the flow of air in the machine room of the refrigerator according to Embodiment 1 of the present invention. A large number of air holes in the machine room cover 51 are constituted by an intake port 52 and an exhaust port 53. An air flow is generated by the operation of the compressor cooling fan 40, and the air outside the refrigerator 1 is taken into the machine room 50 through the air inlet 52 and passes through the compressor cooling fan 40 toward the compressor 2. And blown. Then, the air that has been cooled by cooling the compressor 2 is exhausted to the outside of the refrigerator 1 through the exhaust port 53. In FIG. 5, the components arranged inside the machine room 50 are indicated by dotted lines.
The compressor cooling fan 40 corresponds to a “fan” in the present invention.

FIG. 6 is a schematic diagram of the machine room 50 of the refrigerator 1 according to Embodiment 1 of the present invention. In addition, in FIG. 6, a part of back side of the refrigerator 1 when the machine room cover 51 is removed is schematically shown. Inside the machine room 50, the compressor 2, the condenser 6, the piping 13, the drain water receiving tray 14, the drain pipe 15, the compressor cooling fan 40, and the like are disposed. The pipe 13 constitutes a part of the refrigerant circuit 8 through the refrigerant in the pipe, and connects the compressor 2 and the condenser 6 in the machine room 50. The drain water receiving tray 14 receives the defrost water of the cooler 3 discharged through the drain pipe 15.

The compressor 2 is controlled by the control board, and the number of rotations is changed according to the cooling state of the storage room. Further, the compressor cooling fan 40 is controlled to operate at a predetermined rotational speed determined in accordance with the rotational speed of the compressor 2 when the compressor 2 is operated. Specifically, when the number of rotations of the compressor 2 increases, the number of rotations of the compressor cooling fan 40 is increased, thereby suppressing a temperature increase of the machine room 50 due to heat radiation of the compressor 2. In FIG. 6, the A side is the intake side and the B side is the exhaust side with respect to the compressor cooling fan 40. When the rotation speed of the compressor 2 increases and the amount of heat generation increases, the control board increases the rotation speed of the compressor cooling fan 40 to increase the amount of air sent from the A side to the B side in FIG. Thus, the amount of air circulating through the machine room 50 is increased.

The condition for the compressor cooling fan 40 to change the rotational speed is the rotational speed of the compressor 2, but is not limited to this. For example, when the temperature of the compressor 2 or the machine room 50 is high, the control board may increase the rotation speed of the compressor cooling fan 40. In FIG. 6, the condenser 6 is installed on the intake side with respect to the compressor cooling fan 40, but may be arranged on the exhaust side.

Next, details of the compressor cooling fan 40 will be described with reference to FIGS.
FIG. 7 is a perspective view of the compressor cooling fan 40 according to Embodiment 1 of the present invention. FIG. 8 is a side view of the compressor cooling fan 40 according to Embodiment 1 of the present invention. 7 and 8, the right side of the drawing is the intake side of the compressor cooling fan 40, and the left side of the drawing is the exhaust side of the compressor cooling fan 40. When the compressor cooling fan 40 is installed in the machine room 50, the compressor 2 is located on the exhaust side of the compressor cooling fan 40. FIG. 9 is a perspective view of the fan unit 41 according to Embodiment 1 of the present invention. FIG. 10 is a simplified diagram of the compressor cooling fan 40 tangent to the wall surface of the machine room according to Embodiment 1 of the present invention.

7 and 8, the compressor cooling fan 40 includes a fan part 41 and an attach part 42. The fan unit 41 includes an impeller 47 and a casing 48 that houses the impeller. The impeller 47 has a hub 46 incorporating a motor and a plurality of blades 45. The casing 48 is formed with a cylindrical wind tunnel 48a centering on the rotation axis of the impeller 47, and allows air to pass therethrough. The wind tunnel 48a may be formed to gradually increase from the intake side to the exhaust side of the casing 48 to suppress the return of air to the intake side. The attachment part 42 has an opening 42a, and the fan part 41 can be accommodated in the opening 42a. The attachment part 42 is opened by an opening 42a so as to penetrate from the intake side surface to the exhaust side surface.

During operation of the compressor cooling fan 40, the plurality of blades 45 are rotated by the motor, and the air passes between the casing 48 of the fan unit 41 and the plurality of blades 45 and is pumped to the exhaust side. The compressor cooling fan 40 has a rotation axis of the fan unit 41 at the approximate center of the attachment unit 42. In addition, the outer shape of the opening 42a and the exhaust side of the wind tunnel 48a are configured to substantially coincide with each other on the exhaust side of the attach portion 42 so that air can be smoothly sent out. That is, when the opening of the opening 42a on the exhaust side of the attachment part 42 is the opening end 42b and the opening of the wind tunnel 48a on the exhaust side of the casing 48 is the exhaust outlet 48aa, the exhaust outlet 48aa and the opening end 42b are almost the same. It is the opening of the same size and is in the same position in space. It should be noted that the shapes and positions of the exhaust outlets 48aa and 42b do not have to be completely coincident with each other, as long as they are within a range in which a large air flow does not occur. The shape and position are described as the same.

Further, the exhaust side surface of the attach part 42 is configured such that the height toward the exhaust side in the direction of the rotation axis of the impeller 47 is higher at the position of the outer peripheral end 42c than at the position of the opening end 42b. The outer peripheral end 42c is a part on the exhaust side surface of the attach portion 42, and indicates the edge on the most exhaust side of the radial outer peripheral surface facing the machine room wall surface when installed in the machine room 50. Further, the exhaust side surface of the attachment portion 42 has a tapered shape between the opening end 42b and the outer peripheral end 42c, and the inclination changes from the radial direction to the direction of the machine room wall surface from the opening end 42b to the outer peripheral end 42c. It may be formed as follows. That is, the exhaust side surface of the attachment portion 42 has a height to the exhaust side that is lower than a height obtained by connecting the opening end 42b to the outer peripheral end 42c with a plane.

Further, as shown in FIG. 10, the exhaust side surface of the attach portion 42 may be formed to be a curved surface that gradually protrudes from the opening end 42b toward the outer peripheral end 42c instead of the tapered shape. In this case, the exhaust side surface of the attach portion 42 has a curved surface whose height toward the exhaust side in the rotational axis direction of the impeller 47 is recessed with respect to the plane connecting the opening end 42b and the outer peripheral end 42c. Further, the exhaust side surface may be formed so as to gradually increase the height toward the exhaust side while drawing an arc shape. When the exhaust side surface of the attachment unit 42 is formed into a curved surface, the air sent in a direction perpendicular to the rotation axis direction can be gradually changed from the vertical direction to the wall surface direction by the exhaust side surface of the attachment unit 42.

Further, when the exhaust side surface of the attach portion 42 is formed as a curved surface, the curvature value that minimizes the pressure loss varies depending on the fan performance such as the air volume of the compressor cooling fan 40 and the distance from the wind tunnel 48a. Specifically, it is preferable that the higher the fan performance, the smaller the curvature is. However, the curvature to be adopted may be determined appropriately by an experiment or the like.

In the following description, the highest region of the exhaust side surface of the attachment portion 42 in the rotation axis direction of the impeller 47 is defined as a “projection portion” 43. As shown in FIGS. 7 and 8, when the attachment part 42 has a quadrangular shape, the protrusions 43 indicate, for example, the four corners of the exhaust side surface of the attachment part 42.

As shown in FIG. 8, the height of the outer peripheral end 42 c of the attachment part toward the exhaust side in the direction of the rotation axis of the impeller 47 may be higher than that of the fan part 41. In particular, when the protrusion 43 is formed higher than the plurality of blades 45 toward the exhaust side, the tips of the plurality of blades are protected by the protrusion 43 and the curved surface of the exhaust side surface.

As shown in FIG. 9, in the rotational axis direction of the impeller 47, the height of the tips of the plurality of blades may be higher than the exhaust outlet of the casing 48. If a plurality of blades protrudes from the wind tunnel 48a, the blades may be deformed by contact. Further, if the wind tunnel 48a is too thin, an air flow is hardly generated. On the other hand, the air passing through the wind tunnel 48a is sent out by the pressure difference at the exhaust outlet 48aa. If there are obstacles such as walls around the air, the air is blocked by the obstacles when the air is peeled off from the blades at the exhaust outlet 48aa, thereby causing pressure loss. Therefore, the tips of the plurality of blades are configured to protrude from the exhaust outlet 48aa, thereby reducing the pressure loss at the exhaust outlet 48aa and prompting the exhaust of air.

As shown in FIG. 9, the fan part 41 has a rectangular casing 48 that surrounds the plurality of blades 45. The fan unit 41 may be configured to be held at two diagonal points in the casing 48 of the fan unit 41 with respect to the attachment unit 42. In FIG. 9, the screw holes 48 b are provided at the four corners of the casing 48 of the fan part 41, but may be fixed to the intake side surface of the attachment part 42 using a fastener at two diagonals. .

In addition, although the casing 48 of the fan part 41 is assumed to be a rectangular shape and held at two diagonal points, it is not particularly limited thereto. The fastening position and the number of fastenings for fixing the fan unit 41 to the attachment unit 42 may be determined so that the load due to gravity, wind force, or the like can be distributed depending on the shape of the casing 48 of the fan unit 41.

FIG. 10 shows a cross section when the fan portion 41 of FIG. 9 is accommodated in the opening 42 a of the attach portion 42.

The attachment unit 42 accommodates the fan unit 41 with the inner peripheral surface forming the opening 42 a of the attachment unit 42 and the outer peripheral surface of the casing 48 facing each other. At this time, the exhaust side surface of the attach part 42 and the exhaust side surface of the fan part 41 are flush with each other in the rotational axis direction and are tangent. That is, the attach part 42 accommodates the fan part 41 so that the exhaust outlet of the casing 48 contacts the opening end 42b of the attach part 42 at the exhaust outlet. The exhaust outlet which is the end of the wind tunnel 48a of the casing 48 and the opening end 42b of the attachment portion 42 are flush with each other in the direction perpendicular to the rotation axis. Further, the exhaust side surface of the attachment portion 42 is perpendicular to the rotation axis at the position of the opening end 42b, and gradually changes its inclination while drawing an arc toward the outer peripheral end 42c. It is formed along.

Further, the compressor cooling fan 40 is attached so that the outer peripheral surface in the radial direction of the attachment portion 42 is in contact with the wall surface of the machine room of the refrigerator 1. In FIG. 10, the machine room wall surface on the upper side of the paper indicates the outer plate 11, and the machine room wall surface on the lower side of the paper indicates the base plate 10.

The exhaust side surface of the attach portion 42 has a slope that gradually protrudes from the opening 42a of the attach portion 42 toward the outer peripheral end 42c, and is tangent to the wall surface of the machine room. That is, the exhaust side surface of the attachment part 42 and the machine room wall surface are parallel to each other and are smoothly connected.

When the exhaust side surface is formed with a curved surface, the exhaust side surface of the attachment unit 42 may be formed with a different curvature for each direction depending on the position of the wall surface of the machine room to be attached and the size of the cavity. In other words, when the outer peripheral shape of the attachment portion 42 is a quadrangular shape, the distance from the opening end 42b to the outer peripheral end 42c is maximum on the rectangular diagonal line, but is smaller on the square side. Therefore, the curvature may be changed so that the exhaust side surface of the attachment portion 42 is smoothly connected to the wall surface at the outer peripheral end 42c.

So far, the case where the fan is the compressor cooling fan 40 of the refrigerator 1 has been described, but the present invention is not limited to this. For example, a ventilation fan installed in a building or a cooling fan installed in an apparatus to cool the entire apparatus may be used for ventilation and cooling. Further, as the fan, for example, a propeller fan or the like that makes a flow of air along the rotation axis direction and obtains a large air volume may be used. There may be a device inner wall surface, a duct, an outer wall of a building, or the like for attaching the attachment unit 42.

In addition to the exhaust side protrusion 43 described so far, a curved surface may be provided on the intake side of the attach part 42.
FIG. 11 is a simplified diagram of the intake side surface of the compressor cooling fan 40 according to Embodiment 1 of the present invention. The air intake side surface of the attach portion 42 is formed in a shape different from the exhaust air side surface described so far so that air can be easily sucked into the wind tunnel 48a. Specifically, the intake side surface of the attachment portion 42 has a height toward the intake side in the rotation axis direction of the impeller 47, and the intake air on the radially outer peripheral surface from the intake end 42d of the opening portion 42a of the attachment portion 42 It swells with respect to the plane connecting up to the outer peripheral end 42e on the side. Further, it is formed so as to have a curved surface that gradually protrudes from the opening end 42d on the intake side toward the outer peripheral end 42e on the intake side. That is, the inclination of the intake side surface approaches the rotation axis direction at a position close to the wind tunnel 48a.

In addition, when providing a curved surface on each of the exhaust side and the intake side of the attachment part 42, the attachment part 42 is formed by two parts of the exhaust side and the intake side, and when assembling, the fan part 41 is formed from both sides by two parts. You may comprise so that it may be inserted | pinched.

In addition, although the case where the shape of the attachment part 42 was a square shape was demonstrated in this Embodiment, it is not limited to this. For example, if the wall surface to which the fan is attached is formed in a circular shape, the outer peripheral surface in the radial direction of the attach portion 42 may be formed in a circular shape. In this case, the protruding portion 43 of the present invention is provided on the exhaust side of the radially outer peripheral surface of the attaching portion 42 and becomes a circular protruding portion 43.

As described above, in the present embodiment, the fan includes the fan unit 41 including the impeller 47 having the plurality of blades 45 and the casing 48 in which the wind tunnel 48a that houses the impeller and allows the air flow to pass therethrough, and the exhaust. An attachment portion 42 provided with an opening 42 a that opens from the side surface to the intake side surface and accommodates the fan portion 41. The opening end 42 b on the exhaust side of the opening portion 42 a of the attachment portion 42 and the wind tunnel 48 a of the casing 48. The exhaust side 48a is an opening having the same size as the exhaust outlet 48aa on the exhaust side, and the exhaust side of the attachment portion 42 has a height toward the exhaust side in the direction of the rotation axis of the impeller 47. The position is higher than the position of the opening end 42b, and is recessed from the plane connecting the opening end 42b to the outer peripheral end 42c.

For this reason, pressure loss due to the collision with the wall surface can be reduced as compared with the case where the exhaust side surface of the attach portion 42 is configured as a flat surface. Further, since the generation of convection is suppressed and the direction of the air blown in the direction perpendicular to the rotation axis of the fan unit 41 can be changed to the rotation axis direction, the air volume is ensured. Further, noise can be reduced because pressure loss is reduced and air is smoothly discharged.

Further, the exhaust side surface of the attach portion 42 may be formed with a curved surface whose height toward the exhaust side in the rotational axis direction of the impeller 47 gradually protrudes from the opening end 42b toward the outer peripheral end 42c. As a result, the inclination of the exhaust side surface is gradually directed toward the rotation axis, so that the pressure loss on the exhaust side surface can be further suppressed and the wind path direction can be changed. Moreover, since the fan can ensure the air volume to the compressor 2, it can exhibit a cooling function.

Further, the height of the outer peripheral end 42 c of the attachment portion 42 toward the exhaust side in the rotation axis direction of the impeller 47 may be configured to be higher than the plurality of blades 45. As a result, damage to the blades when the fan is attached can be prevented. Therefore, the generation of abnormal noise can be prevented and the air volume can be secured. Furthermore, the protrusion 43 and the exhaust side face have a larger protective effect because the area higher than the blade 45 can be increased compared to the conventional structure in which the boss is erected to protect the blade 45, and the shape of the exhaust side face is greater. Since the generation of convection is suppressed, the air volume can be secured. Moreover, since the protrusion part 43 is formed as a part of the attachment part 42, it is not necessary to increase parts, and an assembly and parts supply can be simplified.

Further, the height of the tips of the plurality of blades 45 in the direction of the rotation axis of the impeller 47 may be configured to be higher than the exhaust outlet 48aa of the casing 48. Accordingly, air is easily sent out at the position of the exhaust outlet 48aa, and the air is exhausted without stagnation in or near the wind tunnel. Therefore, the air volume is ensured and the noise is reduced.

The attachment unit 42 accommodates the fan unit 41 with the inner peripheral surface forming the opening 42a of the attachment unit 42 facing the outer peripheral surface of the casing 48, and the exhaust side surface of the attachment unit 42 at the exhaust outlet 48aa. The exhaust side surface of the fan unit 41 may have a height that is flush with the rotation axis direction and is tangent. For this reason, generation | occurrence | production of a convection is suppressed in the exhaust outlet 48aa of the wind tunnel 48a, and pressure loss can be reduced.

Further, the casing 48 may have a rectangular outer peripheral surface, and the fan portion 41 may be held at two diagonal points in the casing 48 with respect to the attachment portion 42. Thus, the fan part 41 can be easily attached to the attachment part 42 in a stable manner.

Further, the intake side surface of the attachment portion 42 has a height from the intake end 42d of the opening portion 42a to the intake side outer peripheral end 42e of the radially outer peripheral surface in the rotational axis direction of the impeller 47. A surface that protrudes from the connected plane and gradually protrudes from the opening end 42d on the intake side toward the outer peripheral end 42e on the intake side may be formed. As a result, ambient air is encouraged to be sucked into the wind tunnel 48a on the intake side of the wind tunnel 48a. The amount of blown air can be improved.

In the present embodiment, the refrigerator 1 cools the refrigerant circuit 8 that includes the compressor 2 and circulates the refrigerant, the machine room 50 that houses the compressor 2, and the compressor 2. A fan part 41 having an impeller 47 having a blade 45 and a casing 48 in which a wind tunnel 48a for accommodating the impeller and passing an air flow is formed, and an opening part that is opened from the exhaust side to the intake side and accommodates the fan part 41 A fan having an attachment portion 42 provided with 42a, and the opening end 42b on the exhaust side of the opening 42a of the attachment portion 42 and the exhaust outlet on the exhaust side of the wind tunnel 48a of the casing 48 have the same size. The exhaust side surface of the attachment part 42 is located at the position of the opening end 42b at the position of the outer peripheral end 42c of the outer peripheral surface in the radial direction. Ri high is recessed than a plane obtained by connecting up to the outer peripheral edge 42c from the opening end 42b, fans radial outer peripheral surface of the attachment portion 42 may be attached to at least one wall of the machine room 50. Thereby, since the rise of the temperature in the machine room can be suppressed by the fan in which the air volume is ensured, the refrigerator 1 having a stable quality can be provided.

Further, the refrigerator 1 may be configured such that the exhaust side surface of the attachment unit 42 and at least one wall surface are tangent. As a result, the exhaust side surface of the attach portion 42 is smoothly connected to the surrounding outer wall, so that the occurrence of convection at the boundary between the exhaust side surface and the machine room wall surface is reduced. The wind direction can be guided to the side. Thus, the compressor cooling fan 40 can efficiently use energy that has not conventionally contributed to the cooling of the compressor 2.

Further, the refrigerator 1 may have a fan whose rotation speed is changed depending on the operation state of the compressor 2. Thus, the compressor cooling fan 40 performs cooling in accordance with the load applied to the compressor 2, so that the temperature inside the machine room 50 can be prevented from becoming high. Further, since the rotation speed of the fan is suppressed, noise can be reduced when the load on the compressor 2 is small.

Moreover, the refrigerator 1 may be one in which the compressor 2 is installed on the exhaust side of the fan. For this reason, the deformation | transformation of the blade | wing 45 at the time of attachment or before attachment can be prevented. After the installation, the exhaust side of the fan faces the inside of the machine room 50, but since the blade 45 without deformation is supplied, the compressor cooling fan 40 operates while suppressing the noise and securing the air volume during use of the refrigerator 1. it can.

1 Refrigerator, 2 Compressor, 3 Cooler, 4 Blower, 5 Airway, 6 Condenser, 8 Refrigerant circuit, 9 Thermal insulation layer, 10 Base plate, 11 Outer plate, 13 Piping, 14 Drain water pan, 15 Drain pipe , 40 compressor cooling fan, 41 fan part, 42 attached part, 42a opening part, 42b opening end, 42c outer peripheral end, 42d intake side opening end, 42e intake side outer peripheral end, 43 protruding part, 44 outer peripheral sealing part, 45 blades, 46 hubs, 47 impellers, 48 casings, 48a wind tunnels, 48b screw holes, 48aa exhaust outlets, 50 machine rooms, 51 machine room covers, 52 intakes, 53 exhausts, 100 refrigeration rooms, 200 switching Room, 201 switching room storage case, 300 ice making room, 400 freezing room, 401 freezing room storage case, 500 Vegetables chamber, 501 vegetable compartment storage case.

Claims

A fan unit comprising an impeller having a plurality of blades and a casing formed with a wind tunnel for accommodating the impeller and allowing an air flow to pass through;
An attachment portion that is open from the exhaust side to the intake side and is provided with an opening that accommodates the fan portion;
The opening end on the exhaust side of the opening of the attachment part and the exhaust outlet on the exhaust side of the wind tunnel of the casing are openings of the same size,
The exhaust side surface of the attachment portion has a height toward the exhaust side in the rotational axis direction of the impeller, which is higher than the position of the opening end at the position of the outer peripheral end of the radially outer peripheral surface, from the opening end to the outer peripheral end. A fan that is recessed from the plane connecting the two.
2. The fan according to claim 1, wherein the exhaust side surface of the attachment portion is formed with a curved surface whose height toward the exhaust side in the rotation axis direction of the impeller gradually protrudes from the opening end toward the outer peripheral end. .
The fan according to claim 1 or 2, wherein a height of an outer peripheral end of the attachment portion toward an exhaust side is higher than that of the plurality of blades in a rotation axis direction of the impeller.
The fan according to any one of claims 1 to 3, wherein a height of tips of the plurality of blades is higher than an exhaust outlet of the casing in a rotation axis direction of the impeller.
The attachment unit accommodates the fan unit with an inner peripheral surface forming an opening of the attachment unit facing an outer peripheral surface of the casing,
The exhaust side of the attachment part and the exhaust side of the fan part are flush with each other in the rotational axis direction and are tangent to each other at the exhaust outlet. fan.
The casing has a rectangular outer peripheral surface,
The fan according to any one of claims 1 to 5, wherein the fan unit is held at two diagonal points in the casing with respect to the attachment unit.
The suction side surface of the attachment portion is a plane in which the height toward the suction side in the direction of the rotation axis of the impeller connects from the opening end on the suction side of the opening portion to the outer peripheral end on the suction side of the radially outer peripheral surface. The fan according to any one of claims 1 to 6, wherein a curved surface that protrudes gradually from the opening end on the intake side toward the outer peripheral end on the intake side is formed.
A refrigerant circuit including a compressor and circulating the refrigerant;
A machine room housing the compressor;
The compressor cools the compressor, and includes a fan section including an impeller having a plurality of blades and a casing in which the impeller is accommodated and a wind tunnel through which air flows is formed, and is opened from the exhaust side to the intake side. A fan provided with an attachment part provided with an opening for accommodating the fan part,
The opening end on the exhaust side of the opening of the attachment part and the exhaust outlet on the exhaust side of the wind tunnel of the casing are openings of the same size,
The exhaust side surface of the attachment portion has a height toward the exhaust side in the rotational axis direction of the impeller, which is higher than the position of the opening end at the position of the outer peripheral end of the radially outer peripheral surface, from the opening end to the outer peripheral end. Is recessed from the plane connecting
The refrigerator is a refrigerator in which a radially outer peripheral surface of the attachment portion is attached to at least one wall surface of the machine room.
The refrigerator according to claim 8, wherein the exhaust side surface of the attachment part and the at least one wall surface are tangent.
The refrigerator according to claim 8 or 9, wherein the rotation speed of the fan is changed according to an operation state of the compressor.
The refrigerator according to any one of claims 8 to 10, wherein the compressor is installed on an exhaust side of the fan.