TWI529304B - Fan cover and pumping device - Google Patents

Description

Fan cover and pump device

The present invention relates to a fan cover attached to an air supply port and a pump device provided therewith.

A rocking piston type pump which is a kind of vacuum pump is known as a positive displacement pump for inhaling and exhausting in a pump chamber by reciprocating movement of a piston in a cylinder, for example, widely used. Come as a pressurized pump.

It is known that such a pump is provided with a cooling mechanism for suppressing heat generation of a motor during operation. For example, Patent Document 1 discloses a pump having a fan blade attached to a motor shaft, an opening formed in a casing of the pump, and an opening for taking in air by rotation of the fan blade, and being mounted to the opening thereof. Fan guard.

[prior technical literature] [Patent Document]

Patent Document 1: Japanese Patent Publication No. 2003-515061

Generally, the fan cover is attached to the air outlet for the purpose of preventing the intrusion of a person's finger or foreign matter. On the other hand, the smaller the opening of the fan cover, the greater the resistance of the flow path, and the lowering of the cooling efficiency of the pump and the occurrence of noise become a problem.

In view of the above circumstances, an object of the present invention is to provide a fan cover which can reduce the flow path resistance and a pump device which can improve the cooling efficiency of the motor.

In order to achieve the above object, a fan cover according to an aspect of the present invention is attached to an air blowing port and includes an outer frame and a frame portion.

The outer frame may be attached to the air supply opening to define a flow path of the fluid along the uniaxial direction.

Each of the frame portions has a convex first surface that protrudes in the uniaxial direction and a second surface that is concave toward the first surface in the uniaxial direction, and is supported by the outer frame to allow the flow path Divided into a plurality of areas.

In order to achieve the above object, a pump device according to an aspect of the present invention includes a pump body and a blower unit.

The above pump body has an air supply port.

The air blowing unit has a fan and a fan cover.

The fan is disposed at the air blowing port.

The fan cover has an outer frame and a frame portion. The outer frame is attached to the air supply opening, and defines a flow path of the fluid along the uniaxial direction. Each of the frame portions has a convex first surface that protrudes in the uniaxial direction and a second surface that is concave toward the first surface in the uniaxial direction, and is supported by the frame The outer frame divides the above flow path into a plurality of regions.

1‧‧‧ pumping device

10‧‧‧Pump ontology

11‧‧‧The 1st Ministry

12‧‧‧The 2nd Ministry

13‧‧‧ Drive Department

21‧‧‧Piston

24‧‧‧ Sealing members

25‧‧‧screw components

26‧‧‧The Pufang Room

31‧‧‧Fan

32‧‧‧Fan cover

33‧‧‧Front frame

33a‧‧‧Ring fitting recess

34‧‧‧Framework

35‧‧‧Support components

36‧‧‧Disc

37‧‧‧Installation Department

38‧‧‧Cards

39‧‧‧ Fixed Department

40‧‧‧Fan cover

41‧‧‧Framework

100‧‧‧Pushing box

101‧‧‧1st cover

102‧‧‧2nd cover

103‧‧‧3rd cover

110‧‧‧ box body

110h‧‧‧through hole

111‧‧‧ cylinder

112‧‧‧Help Putou

112a‧‧‧ Inhalation valve

112b‧‧‧Exhaust valve

113‧‧‧Help Putou

113a‧‧‧Intake chamber

113b‧‧‧Exhaust room

114a‧‧‧ suction port

114b‧‧‧Exhaust port

115‧‧‧Air outlet

115a‧‧‧ Department

116a, 116b‧‧‧ vents

117‧‧‧ card hole

118‧‧‧ screws

131‧‧‧Drive shaft

131a‧‧‧End

200‧‧‧Transformation agency

210‧‧‧Connecting rod

211‧‧‧1st end

212‧‧‧2nd end

213‧‧‧ fitting holes

220‧‧‧Eccentric components

221‧‧‧Eccentric shaft

222‧‧‧weight

223‧‧‧ fixing screws

300‧‧‧Air supply unit

341, 411‧‧‧ surface

341a, 351a‧‧‧ top

342, 412‧‧ inside

342a, 352a‧‧‧ bottom

350‧‧‧ joints

351‧‧‧ convex

352‧‧‧ recess

391‧‧‧ screw holes

B1‧‧‧ bearing

B2‧‧‧ bearing

M‧‧ motor

S, Sa‧‧‧ openings

Fig. 1 is a perspective view showing the entire pump device according to an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view showing the main part of the above-described pump device.

Figure 3 is a front elevational view of the fan cover of the above-described pump device.

Fig. 4A is a cross-sectional view taken along line A-A of Fig. 3 of the fan cover.

Fig. 4B is an enlarged view of a main portion of Fig. 4A of the above fan cover.

Fig. 5A is a cross-sectional view taken along line B-B of Fig. 3 of the fan cover.

Fig. 5B is an enlarged view of a main part of Fig. 5A of the above fan cover.

Fig. 6 is a cross-sectional view showing the main part of a fan cover of a comparative example.

A fan cover according to an embodiment of the present invention is attached to a blower port and includes an outer frame and a frame portion.

The outer frame may be attached to the air supply opening to define a flow path of the fluid along the uniaxial direction.

Each of the frame portions has a convex first surface that protrudes in the uniaxial direction and a second surface that is concave toward the first surface in the uniaxial direction, and is supported by the outer frame to allow the flow path Divided into a plurality of areas.

Since each of the frame portions has a first surface that protrudes in a flow direction of the fluid, the resistance of the fluid that has passed through the flow path from the first surface side toward the second surface side can be reduced. Further, when the concave second surface is disposed to face the suction fan, the second surface is induced to move in the rotation direction of the fan. Thereby, the occurrence of turbulence can be suppressed, and the wind cut sound can be reduced.

The fan cover has a joint portion that is joined to the frame portion, and may further include a support member that connects the frame portion to the outer frame.

The relative position of the frame portion and the outer frame can be maintained by the support member, and the mechanical strength as the fan cover can be improved.

The joint portion may have a convex portion continuous with the convex first surface.

Further, the joint portion may have a recess that is continuous with the concave second surface.

Thereby, it is possible to suppress the pressure fluctuation between the first surface of the frame portion and the surface of the joint portion or between the second surface and the inner surface of the joint portion, thereby improving the effect of preventing the wind cut sound from occurring.

The convex first surface is formed, for example, as a curved surface. Thereby, the flow path resistance can be effectively reduced.

The frame portion may be composed of a plurality of annular bodies that are concentrically arranged in a direction orthogonal to the uniaxial direction. Thereby, the flow of the air in the rotation direction of the fan can be efficiently induced in the second surface, and the effect of preventing the wind cut sound from occurring can be improved.

The outer frame, the frame portion, and the support member may each be a molded body of a metal material integrally formed.

Thereby, the frame part and the support member of the above shape can be easily formed, and productivity can be improved. Moreover, the heat resistance and strength of the fan cover can be improved.

A pump device according to an embodiment of the present invention includes a pump body and a blower unit.

The above pump body has an air supply port.

The air blowing unit has a fan and a fan cover.

The fan is disposed at the air blowing port.

The fan cover has an outer frame and a frame portion. The outer frame is attached to the air supply opening, and defines a flow path of the fluid along the uniaxial direction. Each of the frame portions has a convex first surface that protrudes in the uniaxial direction and a second surface that is concave toward the first surface in the uniaxial direction, and is supported by the outer frame to allow the flow path Divided into a plurality of areas.

In the above-described pump device, since the frame portions respectively have the first surface that protrudes in the flow direction of the fluid, the air moves from the first surface side toward the second surface side by the rotation of the fan. It reduces the resistance of the fluid passing through the flow path. Thereby, the cooling efficiency of the motor can be improved. Further, in this case, the concave second surface induces movement of the air in the rotation direction of the fan. Thereby, the occurrence of turbulence can be suppressed, and the wind cut sound can be reduced.

The fan may also be a suction fan. In this case, the fan cover is disposed such that the second surface and the fan face each other in the uniaxial direction. On the other hand, the fan may be a fan for discharge. In this case, the fan cover is disposed such that the first surface and the fan face each other in the uniaxial direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Load device]

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a pumping apparatus according to an embodiment of the present invention.

The pump device 1 of the present embodiment includes a first pumping portion 11, a second pumping portion 12, and a driving portion 13 that drives the first pumping portion 11 and the second pumping portion 12 in common.

The first pumping unit 11 and the second pumping unit 12 are each configured as a vacuum pump. However, it is not limited to this, the two sets of Pudong 11, 12 can also be configured as a pressurized pump (boost pump). The pump device 1 is used, for example, as a booster blower or the like for a gas in a fuel cell system.

The first and second pumping portions 11, 12 typically have a common structure, and in the present embodiment, they are configured to rock the piston pump. Further, the first and second pumping portions 11, 12 may be configured as other displacement pumps such as a diaphragm pump.

The pump device 1 has a pump body 10 and a blower unit 300. Further, the pump body 10 has a piston 21, a pump box 100, a motor M, and a shifting mechanism 200. The pump box 100 includes a first cover 101 constituting one of the first pumping portions 11, a second cover 102 constituting one of the second pumping portions 12, and a third cover 103 constituting one of the driving portions 13.

Fig. 2 is a longitudinal sectional view showing a part of the structure of the first pumping portion 11 and the driving portion 13. In FIG. 2, the X-axis, the Y-axis, and the Z-axis respectively indicate three-axis directions orthogonal to each other. Further, since the second pumping portion 12 is configured as the first pumping portion 11, the first pumping portion 11 will be mainly described here.

The first pumping unit 11 includes a first cover 101, a conversion mechanism 200, and a blower unit 300.

The first cover 101 has a case body 110, a cylinder 111, a pump head 112, and a pump head cover 113. The tank body 110, the cylinder 111, the pump head 112, and the pump head cover 113 are integrated with each other in such a manner as to be stacked in the Z-axis direction.

The case body 110 is connected to the third cover 103 that houses the motor M, and has a through hole 110h through which the connecting rod 210 passes. Further, an air supply port as an air suction port is formed on one side of the air supply unit 300 of the box body 110. 115. The air outlet 115 is formed in a circular shape, and an engaging portion 115a for attaching a fan cover 32 to be described later is formed in a part.

The cylinder 111 is disposed between the tank body 110 and the pump head 112, and slidably accommodates the piston 21 in the Z-axis direction. The pump head 112 is disposed between the cylinder 111 and the pump head cover 113, and has an intake valve 112a and an exhaust valve 112b, respectively. The pump head cover 113 is disposed on the pump head 112, and has an intake chamber 113a that communicates with the intake port 114a and an exhaust chamber 113b that communicates with the exhaust port 114b. As shown in Fig. 1, the intake port 114a and the exhaust port 114b are respectively provided on the side faces of the respective pump portions 11, 12 facing each other, and the respective pump portions 11, 12 are connected to each other.

The piston 21 has a circular plate shape and is fixed to the first end portion 211 of the connecting rod 210 via a screw member 25. The piston 21 forms a pumping chamber 26 between the piston 21 and the pump head 112. The piston 21 reciprocates in the Z-axis direction inside the cylinder 111, and inhales and exhausts the pump chamber 26 through the intake valve 112a and the exhaust valve 112b, thereby performing a predetermined pumping action.

The shifting mechanism 200 has a connecting rod 210 and an eccentric member 220. The conversion mechanism 200 is coupled to the drive shaft 131 of the motor M, and converts the rotation of the drive shaft 131 of the motor M into a reciprocating movement of the piston 21 in the interior of the cylinder 111.

The connecting rod 210 connects the piston 21 and the eccentric member 220 to each other. The connecting rod 210 has a first end portion 211 connected to the piston 21 and a second end portion 212 connected to the eccentric member 220. The first end portion 211 is formed in a circular shape substantially the same diameter as the piston 21. A disk-shaped sealing member 24 is attached between the piston 21 and the first end portion 211. The peripheral portion of the sealing member 24 is slidably grounded on the inner circumferential surface of the cylinder 111 to one side opposite to the side of the pump chamber 26 side.

Further, when the first pumping portion 11 is configured as a pressurizing pump, the peripheral portion of the sealing member 24 is bent to the side of the pump chamber 26.

The second end portion 212 of the connecting rod 210 forms a fitting hole 213 that is fitted to the eccentric member 220. A bearing B1 that rotatably supports the eccentric member 220 is attached to the fitting hole 213. The bearing B2 constitutes a drive shaft 131 that rotatably supports the motor M, and is fixed to the case body 110. The bearings B1 and B2 are composed of an annular ball bearing having an inner ring (inner ring), an outer ring (outer ring), and a plurality of rotating bodies (balls) enclosed between the inner and outer wheels.

The eccentric member 220 has an eccentric shaft 221 and a weight 222. The eccentric member 220 is fixed to the drive shaft 131 by a fixing screw 223.

The eccentric shaft 221 is formed to be eccentric with respect to the center of rotation of the drive shaft 131. Since the weight 222 is used to cancel the vibration of the connecting rod 210 as it rotates around the eccentric shaft 221 as the drive shaft 131 rotates, it is disposed in an eccentric direction with respect to the drive shaft 131 toward the eccentric shaft 221. The position of the opposite direction deviation.

The air blowing unit 300 has a fan 31 and a fan cover 32. The blower unit 300 is configured to rotate by the fan 31 and introduce outside air (air) into the inside of the pump box 100, thereby cooling the pump device 1 in operation.

The fan 31 is disposed at the air blowing port 115, and is attached to the end portion 131a of the drive shaft 131 that protrudes from the eccentric member 220. The fan 31 is configured as an air intake fan that rotates integrally with the drive shaft 131. That is, the motor M is used as a driving source of the rotary fan 31, and constitutes a part of the air blowing unit 300 together with the fan 31 and the fan cover 32.

Further, the second pumping unit 12 side also has a ventilation unit having the same structure as that of the air blowing unit 300, and the fan of the air blowing unit is also configured as an air suction fan. Thereby, the cooling efficiency of the second pumping portion 12 can be improved.

Further, as shown in FIG. 1, vent holes 116a and 116b are formed in the first and second covers 101 and 102. The vent hole 116a discharges the air taken in from the air blowing unit 300 on the first pumping portion 11 side toward the outside of the cover, and the vent hole 116b discharges the air taken in from the air blowing unit on the second pumping portion 12 side toward the outside of the cover.

[fan cover]

Next, the fan cover 32 will be described in detail.

3 is a front view of the fan cover 32. 4A is a cross-sectional view taken along line [A]-[A] of FIG. 3. Fig. 4B is an enlarged view of a main part of Fig. 4A. Figure 5A is a cross-sectional view taken along the line [B] - [B] in Figure 3. Fig. 5B is an enlarged view of a main part of Fig. 5A.

The fan cover 32 has an outer frame 33, a plurality of frame portions 34, and a plurality of support members 35. The fan cover 32 is formed of a molded body of a metal material such as aluminum alloy. The fan cover 32 is attached to the air blowing port 115 with respect to the fan 31 in the Y-axis direction.

The outer frame 33 has an annular shape having a diameter substantially the same as that of the air blowing port 115, and has an annular fitting recess 33a attachable to the periphery of the air blowing port 115 on the surface facing the fan 31 side. The outer frame 33 defines a flow path for air taken in from the outside of the air supply port 115 toward the inside in the Y-axis direction by the edge portion on the inner peripheral side.

The plurality of frame portions 34 divide the air flow path defined by the outer frame 33 into a plurality of regions. Each of the plurality of frame portions 34 is configured to be formed A plurality of annular bodies having different diameters around the disk portion 36 at substantially the center of the fan cover 32 (the region facing the drive shaft 131 in the Y-axis direction) are formed. That is, each frame portion 34 is concentrically arranged in the radial direction in the direction orthogonal to the Y-axis direction. In addition, since each frame part 34 has the same size and the same shape, the same reference numerals are attached to each.

The disk portion 36 is formed in a convex shape in a cross section so as to bulge toward the outer side of the pump device 1, whereby the flow resistance of the air passing through the disk portion 36 can be reduced.

The adjacent frame portions 34 are arranged at substantially equal intervals in the radial direction, and an opening portion S as a part of the air flow path is formed between each. The radial width of the opening S is limited to a width in which, for example, a human finger cannot be inserted, and in the present embodiment, it is approximately 5 mm or less.

The frame portion 34 has a surface (first surface) 341 and an inner surface (second surface) 342, respectively. The surface 341 of the frame portion 34 constitutes a convex shape that protrudes in the Y-axis direction. That is, the surface 341 has a curved surface which is inclined from the top portion 341a toward the respective opening portions S by the top portion 341a of the substantially central portion in the radial direction. Further, the curved surface may be a spherical surface or an aspherical surface, and the curvature is not particularly limited.

On the other hand, the inner surface 342 of the frame portion 34 is formed in a concave shape facing the surface 341 in the Y-axis direction. The inner surface 342 has a bottom surface 342a that passes through a substantially central portion in the radial direction, and is formed by a curved surface that is inclined from the bottom portion 342a toward each of the opening portions S. The inner surface 342 is formed, for example, by a curved surface concentric with the convex surface 341.

The frame portion 34 is disposed such that the inner surface 342 faces the fan 31. As a result, the air passing through the fan cover 32 on the side of the first pumping portion 11 during the operation of the pump device 1 flows from the surface 341 toward the inner surface 342.

A plurality of support members 35 are coupled between the outer frame 33 and the plurality of frame portions 34. That is, the plurality of support members 35 respectively support the plurality of frame portions 34, and the plurality of frame portions 34 are connected to the outer frame 33. A plurality of support members 35 respectively extend in the radial direction and are equally spaced around the Y axis. That is, the disk portion 36 is radially arranged.

Each of the support members 35 has a plurality of joint portions 350 joined to the plurality of frame portions 34. Since the support members 35 are joined to the plurality of frame portions 34 at substantially equal intervals in the radial direction, the joint portions 350 are formed at substantially equal intervals in the radial direction, that is, the extending direction of the support members 35.

The joint portion 350 has a convex portion 351 continuous with the convex surface 341 of the frame portion 34 and a concave portion 352 continuous with the concave inner surface 342 of the frame portion 34. The convex portion 351 and the concave portion 352 are each formed of a curved surface having the same shape as the surface 341 and the inner surface 342 of the frame portion 34. Further, the convex portion 351 has a top portion 351a continuous with the top portion 341a of the frame portion 34. The recess 352 has a bottom 352a that is continuous with the bottom 342a of the frame portion 34. That is, the joint portion 350 smoothly connects the surface 341 and the inner surface 342 of the frame portion 34 to the front surface and the inner surface of the support member 35, respectively, so that the curved surfaces of the surface 341 and the inner surface 342 are formed to be continuous in the circumferential direction.

The fan cover 32 further has a mounting portion 37, a pair of locking portions 38, and a pair of fixing portions 39.

The attachment portion 37 is formed in one portion of the outer frame 33, and is configured to be coupled to the engagement portion 115a formed at one of the air blowing ports 115. The pair of locking portions 38 are integrally formed in one portion of the outer frame 33, and are configured to be engageable with the locking holes 117 (FIG. 1) formed in the vicinity of the air blowing port 115 of the box body 110. a pair of fixing portions 39 One portion of the outer frame 33 is integrally formed, and has a screw hole 391 through which the screw 118 (FIG. 1) screwed to the air supply port 115 is inserted.

The position at which the attachment portion 37, the locking portion 38, and the fixing portion 39 are formed is not particularly limited. In the present embodiment, in FIG. 3, the attachment portion 37 is formed at the lowermost portion of the fan cover 32, and the locking portion 38 and the fixing portion 39 are formed. They are respectively formed at positions above the fan cover 32 that is symmetrical with the Z axis. The shape, the number, and the like of the attachment portion 37, the locking portion 38, and the fixing portion 39 are not particularly limited. For example, the locking portion 38 may be omitted as needed.

The fan cover 32 configured as above is formed of a molded body of a metal material. The forming method can be a molding method, a molding method, and other molding methods. The metal material is, for example, aluminum or an alloy thereof, but iron, stainless steel, copper or an alloy thereof, magnesium or an alloy thereof, and other metal materials may also be used.

The fan cover 32 is formed by a molding method, whereby the frame portion 34 forming the convex surface 341 and the concave inner surface 342, and the support member 35 formed by the convex portion 351 and the concave portion 352 can be easily and simultaneously formed, but Improve productivity.

Moreover, since the fan cover 32 is made of metal, heat resistance and mechanical strength can be improved. Further, since the heat transfer characteristics are also high, the heat dissipation of the pump box 100 can be improved.

[The 2nd Ministry]

The second pumping department 12 is like the composition of the first pumping department 11. The second pumping unit 12 and the first pumping unit 11 are simultaneously driven by a common motor M. The drive shaft 131 also extends to the second pumping portion 12 side and is coupled to the eccentric shaft of the second pumping portion 12 (not shown).

In the present embodiment, the first pumping portion 11 and the second pumping portion 12 are driven at different phases. For example, the eccentric shafts of the respective pump portions 11, 12 are set such that when the piston 21 of the first pumping portion 11 is at the top dead center, the piston of the second pumping portion 12 is at the bottom dead center. Further, the fan cover attached to the second pumping portion 12 is attached to the fan cover 32 of the first pumping portion 11, and is disposed such that the inner surface 342 of the frame portion 34 faces the fan.

[Action of the pump device]

Next, the operation of the pump device 1 of the present embodiment configured as above will be described. Here, the operation of the first pumping unit 11 will be mainly described.

By the driving of the motor M, the eccentric shaft 221 revolves around the drive shaft 131 along a circumference having a radius corresponding to the eccentric amount of the self-driving shaft 131. The connecting rod 210 coupled to the eccentric shaft 221 converts the rotation of the drive shaft 131 into a reciprocating movement of the piston 21 in the interior of the cylinder 111. In other words, the piston 21 reciprocates in the Z-axis direction while shaking inside the cylinder 111 in the X-axis direction in FIG. 2 . Thereby, the intake and exhaust of the pump chamber 26 are alternately performed, and the predetermined vacuum exhausting action of the first pumping portion 11 is obtained.

When the pump device 1 is driven, the fan 31 of each pump portion rotates integrally with the drive shaft 131. Thereby, the air outside the pump box 100 of the pump device 1 is sucked into the inside of the pump box 100 through the fan cover 32. Then, the air passes through the plurality of openings S formed between the frame portions 34 of the fan cover 32, and is sucked into the first cover 101 and the second cover 102 from the air outlets 115 of the respective pump portions. The air to be sucked is discharged from the vent holes 116a and 116b while being exchanged with heat by the motor M or the like being driven.

Here, the frame portion in the fan cover of the conventional configuration is shown in FIG. A structural example is shown as a comparative example. Fig. 6 is a cross-sectional view showing a main portion of a fan cover 40 of a comparative example, showing a part of a frame portion 41 in which a plurality of openings Sa are formed. The fan cover 40 of the comparative example is produced by punching treatment of sheet metal or the like. The surface 411 and the inner surface 412 of the frame portion 41 are formed in a plane orthogonal to the Y-axis direction. The frame portion 41 of such a shape increases the flow path resistance of the opening portion Sa by obstructing the air flow passing through the opening portion Sa. Thereby, the suction efficiency of the air is lowered, and the cooling efficiency of the motor M is lowered. Further, the air is turbulent due to the fan cover 40, and wind-cutting sound is likely to occur.

On the other hand, in the fan cover 32 of the pump device 1 of the present embodiment, since the surface 341 of the frame portion 34 is formed by a curved curved surface which is inclined from the top portion 341a toward the opening portion S, when the air flows toward the surface 341, An air flow occurs from the top portion 341a along the inclined surface. Thereby, the flow path resistance of the opening S is lower than that of the fan cover 40 of the comparative example, and the air suction efficiency is further improved. As a result, the cooling efficiency of the motor M and the pump box 100 around it is improved, and the life of the pump device 1 and the operation can be stabilized.

Further, since the fan cover 32 of the present embodiment is formed in a concave shape with respect to the inner surface 342 of the fan 31, the air movement in the rotation direction of the fan 31 is induced, whereby the occurrence of turbulence can be suppressed. Reduce the wind cut.

Further, the support member 35 of the fan cover 32 has a convex portion 351 and a concave portion 352 which are formed by the joint portion 350 joined to the frame portion 34 and the convex surface 341 of the frame portion 34 and the concave inner surface 342. Therefore, the height difference between the surface 341 and the inner surface 342 of the frame portion 34 and the support member 35 is not formed, whereby the pressure fluctuation in the joint portion 350 can be suppressed, and the effect of preventing the wind cut sound from being generated can be enhanced. Further, since the plurality of frame portions 34 are formed by a ring-shaped frame, Thus, the airflow moving in the direction of rotation of the fan 31 is efficiently induced, whereby a large contribution to the prevention of wind cutting can be achieved.

Further, the fan cover 32 of the present embodiment is configured by a molded body of a metal material integrally formed of the outer frame 33, the frame portion 34, the support member 35, and the like. Thereby, the frame portion 34 and the support member 35 having a predetermined curved surface can be easily produced. Further, productivity can be improved as compared with, for example, production by welding of metal wires or the like.

Further, since the fan cover 32 is formed of a metal material such as aluminum, the strength can be further improved as compared with the case where a molded body such as a resin having the same thickness is formed. Therefore, the thinness of the fan cover 32 can be achieved, the material cost can be suppressed, and the production can be performed at low cost.

[Examples]

A fan cover having a diameter of about 130 mm and having a surface area of about 13,000 mm ^{2 was} produced as an example of the present embodiment. The opening ratio of the fan cover of the embodiment is about 40%. On the other hand, a structure shown in Fig. 6 was prepared, that is, a fan cover having a flat surface on the surface of the frame portion as a comparative example. The fan cover of the comparative example, like the embodiment, has a diameter of about 130 mm, a surface area of about 13,000 mm ² and an opening ratio of about 40%. The air blowing unit which is the pump device of the structure of the present embodiment is applied, and the temperature rise amount of the cylinder surface after the operation for 120 minutes under a pressure of 50 kPa is measured.

As a result, in the pump device to which the fan cover of the present embodiment is applied, the temperature rise of the cylinder is lowered by about 0.9 K (° C.), and the temperature rise of the motor is lowered by about 3 K (° C.) as compared with the pump device of the comparative example. From this result, it was confirmed that the fan cover 32 of the present embodiment can suppress the cooling efficiency without changing the opening area. Low.

Here, the temperature rise of the cylinder causes the wear of the sealing member of the piston, the deterioration of the bearing mounted around the eccentric shaft, and the life of the pump device itself. In fact, when the temperature rise of the cylinder surface can be lowered by about 0.9 K, it is confirmed by the inventors' calculation that the life of the pump device is elongated by about 6%. That is, according to the fan cover 32 according to the present embodiment, it is possible to contribute to the longevity of the pump device 1.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto, and various changes can be made in accordance with the technical idea of the present invention.

For example, in the above embodiment, the fan cover 32 constituting the air blowing unit 300 of the pump device 1 is exemplified as a fan cover. However, the present invention is also applicable to a fan cover in other air blowing units than the pump.

Further, in the above embodiment, the surface 341 of the frame portion 34 is described as a curved surface. However, the surface 341 is not limited thereto, and the cross-sectional shape may be, for example, a trapezoidal shape. Further, the cross-sectional shape may be a triangular shape having the top portion 341a as a vertex.

In the above embodiment, the plurality of frame portions 34 are configured to form a concentric annular body. However, the present invention is not limited thereto, and may be arranged in a lattice shape, for example. In this case, the support member for connecting the plurality of frame portions to the outer frame may be omitted, and the plurality of frame portions may be directly supported by the outer frame.

Further, the frame portion 34 is not limited to a plurality of cases, and may be constituted by only a single number. In this case, the frame portion may be formed in a rectangular wave or a triangular wave such as an alternating direction of extension, or may be formed in a spiral shape spirally wound in a plane.

In addition, in the above embodiment, the intake port 114a and the exhaust port 114b are configured to be common to the first and second pumping portions 11 and 12, but the first and second pumping portions 11 and 12 are not limited thereto. It can also have individual suction and exhaust ports.

Further, in the above embodiment, the motor M of the pump device 1 is used as the rotational drive source of the fan 31, but a motor other than the motor M may be mounted as the rotational drive source of the fan 31.

Further, in the above embodiment, the fan constituting the air blowing unit on the side of the second pumping portion 12 is configured as an air intake fan, but the fan may be configured as an air discharging fan. In this case, the fan cover attached to the second pumping portion 12 is opposite to the fan cover 32 attached to the first pumping portion 11, and is disposed such that the surface of the frame portion faces the fan. In the above configuration, the air taken in from the air blowing port 115 of the first cover 101 passes through the third cover 103 and is discharged from the air blowing port 115 formed in the second cover 102. Thus, the pump device 1 can be efficiently cooled by forming a unidirectional air flow in the pump box 100.

The fan cover of the present invention is not limited to the air supply unit of the rocking piston type pump, and is also applicable to other pump devices having a fan. It can also be widely used as a fan cover for other electrical products such as air conditioner outdoor units.

32‧‧‧Fan cover

33‧‧‧Front frame

33a‧‧‧Ring fitting recess

34‧‧‧Framework

36‧‧‧Disc

341‧‧‧ surface

342‧‧‧ inside

Claims (6)

A fan cover is attached to the air outlet with respect to the fan and has an outer frame that can be attached to the air supply opening to define a flow path of the fluid along the uniaxial direction; and the frame portion is supported by the outer frame. The flow path is divided into a plurality of regions, and is a plurality of annular bodies that are concentrically arranged in a direction orthogonal to the uniaxial direction and are formed along a rotation direction of the fan, and each has a first surface and has a convex curved surface that protrudes in the uniaxial direction and along the top of the fan in the rotational direction; and the second surface is formed by a concave curved surface having a bottom along the rotational direction, and The uniaxial direction is disposed so as to face the first surface and the fan; the disk portion is formed to have a convex cross section so as to bulge in the uniaxial direction, and is connected to the support member; and the support member is The disk portion is radially arranged and connected to the outer frame, and has a plurality of joint portions that are respectively joined to the plurality of frame portions and each include a convex portion. Is formed of the first surface of the continuous first surface and with the same curved surface; and a concave portion, and the second line by a continuous surface and the second surface and the curved surface of the same is formed. The fan cover according to claim 1, wherein the disk portion has a peripheral portion that protrudes in a direction opposite to a direction in which the first surface protrudes. And forming a ring shape; and a central portion bulging from the peripheral edge portion in the same direction as the first surface. The fan cover according to claim 1, wherein the outer frame, the frame portion, and the support member are each formed of a molded body of a metal material integrally formed. The fan cover according to claim 1, wherein the second surface is formed as a curved surface concentric with the first surface. A pump device comprising: a pump body having an air supply port; and a blower unit having: a fan disposed at the air supply port; and a fan cover disposed opposite to the fan; the fan cover having an outer frame a flow passage that is attached to the air supply opening to define a fluid along a uniaxial direction; the frame portion is supported by the outer frame, and divides the flow path into a plurality of regions orthogonal to the uniaxial direction a plurality of annular bodies arranged in a direction concentrically, each having a first surface formed of a convex curved surface having a top portion that protrudes in the uniaxial direction and along a rotation direction of the fan; and a second surface a concave curved surface having a bottom portion along the rotation direction, and disposed in a direction in which the uniaxial direction faces the first surface and the fan; and the disk portion bulges in the uniaxial direction Formed to have a convex profile; and The support member is disposed radially from the disk portion and connects the frame portion to the outer frame, and has a plurality of joint portions that are respectively joined to the plurality of frame portions and each include a convex portion. The curved surface is formed by a curved surface that is continuous with the first surface and is the same as the first surface, and the concave portion is formed by a curved surface that is continuous with the second surface and is identical to the second surface. The pump device according to claim 5, wherein the air blowing unit includes a motor having a drive shaft that rotates integrally with the fan, and the disk portion is disposed opposite to the drive shaft with the fan Further, the peripheral portion has a ring-shaped portion that protrudes in the uniaxial direction and is formed in an annular shape, and a central portion that bulges from the peripheral edge portion in the uniaxial direction opposite to the fan.