JP4936882B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device comprising: a rotary drive type pump body driven by an electric motor; and a driven pulley that is fixed to a rotation shaft of the pump body and that transmits a driving force of the electric motor via a belt. .

  According to the present applicant, as shown in FIG. 11, the rotation shaft 111 of the pump main body 110 and the rotation shaft 121 of the electric motor 120 are connected in series by a coupling 140, and the pump main body 110 and the electric motor 120 are connected in series so as to be arranged in series, and the cylindrical joint 130 is formed in a cylindrical shape so as to incorporate the serial connection portion 115, and the rotation shaft 111 is connected to the serial connection portion 115. , 121 and a centrifugal fan type impeller 150 which is fixed so as to rotate together with its axis coaxial, has been proposed.

  In this pump device, as indicated by an arrow in FIG. 11, cooling air is sucked from the suction port 133 and guided to the center side of the impeller 150 by the throttle portion 132. Then, the air flow generated by the rotation of the impeller 150 is discharged from the cylindrical joint 130 so as to pass around the pump body 110. Thereby, the pump body 110 can be cooled.

Further, a soundproofing mechanism of a vacuum generator in which the periphery of the vacuum pump main body and the serial connection portion of the rotating shaft are surrounded by a soundproofing wall has been disclosed by the present applicant (see Patent Document 1). In this vacuum generator, a centrifugal fan type impeller is mounted to cool the vacuum pump body, and a throttle part for guiding the air flow on the intake side of the impeller is provided on the soundproof wall side. ing.
The above pump device is a device in which the power of the electric motor is transmitted to the pump main body by coupling the rotary shaft of the pump main body and the rotary shaft of the electric motor by coupling.
JP 2001-155961 A (first page, FIG. 1)

The problem to be solved with respect to the pump device is that a device for transmitting the power of the electric motor to the pump body by means of a pulley and a belt has been proposed with a cooling mechanism comparable to a device for transmitting the power by coupling. There is no point.
Accordingly, an object of the present invention is to provide a pump device in which a cooling mechanism or the like is suitably incorporated in a device configuration in which the power of an electric motor is transmitted to a pump body by a pulley and a belt.

The present invention has the following configuration in order to achieve the above object.
According to an aspect of the pump device of the present invention, a rotationally driven pump body driven by an electric motor, and a driving force of the electric motor that is fixed to a rotating shaft of the pump body is transmitted via a belt. A driven pulley having a driven pulley, the pump device being fixed to an end surface of the driven pulley on the pump body side so as to generate an air flow so as to cool the pump body, and substantially orthogonal to an axis of the rotating shaft. And a plurality of blades provided on the pump body side of the core plate portion so that the rotation shaft and the shaft center of the pump body are coaxial and rotate together. A centrifugal fan type impeller provided, and a fan cover that covers the impeller and has a ventilation portion for discharging air.

  Further, according to one aspect of the pump device according to the present invention, the main body cover surrounding the pump main body is provided with a ventilation gap through which cooling air can flow between the peripheral wall of the pump main body, and the ventilation The air gap and the inner space of the impeller may be communicated with each other so that air is sucked from the air gap by the impeller to generate an airflow of cooling air.

Moreover, according to one form of the pump apparatus concerning this invention, the said impeller is provided in the said pump main body side and the outer peripheral part of the said several blade | wing, and the ring board part which guides so that airflow may be throttled It can be characterized by comprising.
Moreover, according to one form of the pump apparatus concerning this invention, in the said impeller, the said core plate part is formed in a substantially disk shape, and the internal diameter of the said ring plate part rather than the outer diameter of this core plate part. Can be characterized by being formed large.
Further, according to one form of the pump device according to the present invention, in order to fix the impeller to the end surface of the driven pulley on the pump main body side with a screw, a female screw portion and a female screw portion are provided on the end surface of the driven pulley. A concentric counterbore part is provided, and a through-hole through which a screw is passed through the core plate part and a convex part that is concentrically fitted and positioned in the counterbore part are provided in the through-hole. it can.

  Moreover, according to one form of the pump apparatus concerning this invention, the said pump main body is arranged in parallel 2 units | sets, the drive pulley fixed to the drive rotating shaft of this electric motor by one electric motor, The said pump The impeller is driven via each driven pulley fixed to each of the rotating shafts of the main body, and each belt wound between the driving pulley and the driven pulley, and the impeller is placed on each of the driven pulleys. It can be characterized by being fixed via a plate part.

Moreover, according to one form of the pump apparatus concerning this invention, the said fan cover is exhausted in the substantially tangential direction of the concentric circle with the axial center of a rotating shaft by rotation of the said impeller. And a guide wall extending in the tangential direction so as to guide air to the discharge port.
Moreover, according to one form of the pump apparatus concerning this invention, the discharge port of the said fan cover is each provided in two places of the one side wall upper part and the other side wall lower part which are diagonal positions, The said guide wall is provided with the following. It is provided at two locations corresponding to the two outlets, and is provided so that the distance from the outer periphery of the impeller gradually increases from the vicinity of one outlet toward the other outlet. It can be.

Moreover, according to one form of the pump apparatus concerning this invention, the partition plate part which isolate | separates into the said fan cover the space where the said impeller was distribute | arranged, and the space where the said driven pulley and the said belt were arrange | positioned. It can be characterized by being provided.
Moreover, according to one form of the pump apparatus concerning this invention, the said drive pulley is arrange | positioned between the two said driven pulleys, and the belt cover which covers the said drive pulley, the two said driven pulleys, and the two said belts However, it can be characterized by being constituted by a pair of halved cover members that can be divided into two in the arrangement direction of the three pulleys and are provided in a fitting relationship.
Further, according to one aspect of the pump device according to the present invention, the pair of halved cover members are slid and mounted from both sides, and are fitted in the central portion of the partition plate portion of the fan cover. A guide rail extended in the arrangement direction of the pulley may be provided on the plate surface on the electric motor side.

  According to the pump device of the present invention, the power of the electric motor is transmitted to the pump body by the pulley and the belt, and there is a particularly advantageous effect that a cooling mechanism or the like can be suitably incorporated.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a best mode example of a pump device according to the present invention will be described in detail based on the accompanying drawings (FIGS. 1 to 10).
FIG. 1 is a cross-sectional view seen from the side showing one embodiment of the pump device of the present invention. FIG. 2 is a cross-sectional view of the pump device of FIG. 1 as viewed from above (the belt 15 is omitted). FIG. 3 is a perspective view of the entire apparatus in which an intake case and an exhaust case are mounted on the pump apparatus of FIG. 4 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 5 is a cross-sectional view taken along the line BB in FIG. FIG. 6 is a perspective view showing a centrifugal fan type impeller used in the pump device of FIG. FIG. 7 is a perspective view of the impeller of FIG. 6 viewed from the back side.

This pump device includes a rotationally driven pump body 10 driven by an electric motor 20 and a driven pulley that is fixed to a rotating shaft 11 of the pump body 10 and that transmits the driving force of the electric motor 20 via a belt 15. 40. In this embodiment, two pump main bodies 10 and 10 are arranged in parallel and driven by one electric motor 20.
The pump body 10 of the present embodiment is a rotary pump including vanes, and is operated by a driving unit such as an electric motor 20. Further, this pump device is an oil-free pump, is used as a vacuum pump, and can be used as a blower device if the exhaust gas is a product gas.
As shown in FIG. 3, reference numeral 17 denotes an intake case in which a filter can be built, through which gas is sucked into the pump body. Reference numeral 18 denotes an exhaust case in which a silencer structure or the like is built, through which gas is discharged from the pump body 10. As shown in FIG. 9, 17 a is an intake port of the pump body 10 and is connected to the intake case 17. Reference numeral 18 a denotes an exhaust port of the pump body 10 and is connected to the exhaust case 18.

A centrifugal fan type impeller 50 is fixed to the end surface 41 of the driven pulley 40 on the pump body 10 side so as to generate an air flow so as to cool the pump body 10, and is substantially the same as the axis of the rotary shaft 11. A core plate part 51 that guides the airflow in a direction orthogonal to each other and a plurality of blades 52 provided on a plate surface of the core plate part 51 on the pump body 10 side. It is provided so that it may be coaxial and rotate together.
The rotary shaft 11 is extended to the electric motor 20 side so that the impeller 50 is disposed and the driven pulley 40 can be fixed.

The impeller 50 is provided with a ring plate portion 53 that is provided in a ring shape on the pump body 10 side of the plurality of blades 52 and guides the airflow to be reduced.
According to the impeller 50 formed in this way, a cooling air flow can be suitably generated by the principle of a centrifugal fan. Further, it is not necessary to provide a throttle part for narrowing the air flow on the fan cover 30 and the main body cover 70 described later. Accordingly, the fan cover 30 and the main body cover 70 have a simple shape as can be seen from FIG. 1 and the like, and can be manufactured by a simple mold.

Moreover, in this impeller 50, as shown in FIG.6 and FIG.7, the core-plate part 51 is formed in disk shape substantially, and the internal diameter of the ring board part 53 is more than the outer diameter of the core-plate part 51. Largely formed. Further, the air guide surfaces of the blades 52 are parallel to the axis of the impeller 50.
Therefore, the impeller 50 has a form that can be molded with a simple mold. That is, since the direction in which the mold of the mold is broken may be one direction in the axial direction of the impeller 50, resin molding by an injection molding machine is possible, and the manufacturing cost can be reduced.
Reference numeral 58 denotes a hole through which the rotary shaft 11 passes.

According to the pump device having the above configuration, as shown by the arrow in FIG. 2, cooling air (outside air) passes through the periphery of the pump 10 body and is guided by the ring plate portion 53 to the center of the impeller 50. Guided sideways. Then, an air flow that is sucked by the impeller 50 and generated by the centrifugal force of the rotating impeller 50 is guided by the core plate portion 51 and a partition plate portion 35 described later, and is an exhaust port that is a ventilation portion provided in the fan cover 30. 31 (see arrows in FIG. 5 indicating the air flow). The discharge port 31 is a side wall of the fan cover 30 and is provided corresponding to the position where the impeller 50 is disposed, and is opened so that air flows out in a radial direction perpendicular to the axis of the rotary shaft 11. . Details of the fan cover 30 will be described later.
According to this, according to the principle of the centrifugal fan, the wind noise is smaller than that of the axial flow fan, and the noise is low, and the necessary static pressure is generated to obtain the air volume for cooling the apparatus.

Reference numeral 70 denotes a main body cover, which is a soundproof wall surrounding the pump main body 10. The main body cover 70 provides a ventilation gap 75 that allows the cooling air to flow between the peripheral wall 12 of the pump main body 10.
The ventilation gap 75 and the inner space 50 a of the impeller 50 are communicated with each other by the communicating portion 13 so that air is sucked from the ventilation gap 75 by the impeller 50 to generate an air flow of cooling air. Note that an end surface wall portion 71 formed in the bottom shape of the main body cover 70 is appropriately provided with a suction port for taking in outside air. Further, an opening 77 is provided in the upper surface of the main body cover 70 from the vicinity of the center to the end face wall 71 side, and cooling air also flows into the ventilation gap 75 from this portion (FIGS. 1 and 9). reference).
Thereby, cooling air can be efficiently ventilated along the outer surface of the peripheral wall 12 of the pump main body 10, and cooling performance can be improved.

Further, in this embodiment, two pump bodies 10 are arranged side by side, and a drive pulley 22 fixed to a drive rotation shaft 21 of the electric motor 20 by one electric motor 20 and a rotation shaft of the pump body 10. 11, and driven belts 40, 40 fixed to the respective belts 11, and belts 15, 15 wound between the driving pulley 22 and the driven pulley 40. An impeller 50 is fixed to each of the driven pulleys 40, 40 via a core plate part 51.
According to this, a cooling mechanism and a soundproofing mechanism can be suitably incorporated even in a pump device in which a plurality of pump bodies 10 are arranged.

Next, the structure for fixing the impeller 50 to the driven pulley 40 will be described in detail with reference to FIGS. FIG. 8 is an enlarged cross-sectional view of a main part of FIG.
As shown in FIGS. 1, 2, and 8, the impeller 50 is fixed to the end surface 41 of the driven pulley 40 on the pump body 10 side by screws (three bolts 45 in this embodiment).

On the end surface 41 of the driven pulley 40 on the pump body 10 side, a plurality of female screw portions 42 and a plurality of counterbore portions 43 (see FIG. 8) concentric with the female screw portions 42 are provided.
Reference numeral 47 denotes a key groove, which is used to connect the driven pulley 40 to the rotary shaft 11 (see FIG. 8). Reference numeral 48 denotes a through hole into which the rotary shaft 11 is fitted.

  Further, as shown in FIGS. 6 and 7, the core plate 51 of the impeller 50 is positioned by being fitted into the counterbore 43 of the coupling 40 concentrically with the through hole 54 through which the bolt 45 passes and the through hole 54. A plurality of convex portions 55 are provided. In addition, although the convex part 55 of this form example is shape | molded by the donut-shaped periphery shape, it is not limited to this, What is necessary is just to be able to position by fitting with the spot facing part 43.

According to the configuration for mounting the impeller 50 described above, it can be easily formed without the need for providing any other special engagement structure. In particular, the step of forming the spot facing portion 43 can be easily performed by a process of slightly extending the processing when the female screw portion 42 is provided. Moreover, it is easy to manufacture a mold for forming the convex portion 55 of the core plate portion 51, and the manufacturing cost can be reduced.
Further, the convex portion 55 is provided concentrically with the through-hole 54 through which the bolt 45 is passed, and is tightened by the bolt 45 at the time of mounting, so that it is securely fixed in a state of being securely fitted to the spot facing portion 43. There is also.

Next, details of the fan cover 30 will be described in detail with reference to FIGS.
The fan cover 30 has a discharge port 31 that covers the impeller 50 and is a ventilation portion through which air is discharged.
The fan cover 30 of the present embodiment is provided on a part of a wall constituting the fan cover 30 so that the air is discharged in a substantially tangential direction concentric with the axis of the rotating shaft 11 by the rotation of the impeller 50. A discharge port 31 and a guide wall 32 extending in the tangential direction so as to guide air to the discharge port 31 are provided (see FIG. 5).
According to this, the flow of the cooling air can be suitably guided, the exhaust can be efficiently performed without increasing the ventilation resistance, and the cooling performance can be improved. Further, the fan cover 30 having an appropriate strength can be configured compactly. Furthermore, it is also a part of the sound barrier surrounding the pump body 10.
Further, the fan cover 30 of the present embodiment is directly fixed to the side plate 14 of the pump body 10. For this reason, the guide wall 32 etc. can be arrange | positioned to an appropriate position with high precision, and desired performance can be obtained reliably.

Further, the discharge ports 31 of the fan cover 30 according to the present embodiment are provided at two locations (see FIG. 4) of one side wall upper portion 30a and the other side wall lower portion 30b which are diagonal positions. And the guide wall 32 is provided in two places corresponding to the two discharge ports 31, and the space | interval with the outer periphery of the impeller 50 expands gradually toward the other discharge port 31 from the one discharge port 31 vicinity. (See FIG. 5). In addition, the discharge port 31 of this embodiment is formed by a plurality of slit-shaped openings that are long in the horizontal direction.
Thereby, directionality can be given about the exhaust of the air for cooling, and it can exhaust to an appropriate direction. In particular, when two pump bodies 10 as in this embodiment are arranged side by side, it is possible to avoid the positional relationship between the exhaust ports 31 of adjacent fan covers 30 facing each other, and efficient cooling air is supplied. The air can be exhausted (refer to the arrows indicating the air flow in FIG. 5).
It should be noted that the mounting direction of the fan cover 30 is not limited to opening in the horizontal direction like the discharge port 31 of the present embodiment, and it goes without saying that it can be directed in other directions.

Further, as shown in FIG. 1 and the like, the fan cover 30 is provided with a partition plate portion 35 that separates a space in which the impeller 50 is disposed from a space in which the driven pulley 40 and the belt 15 are disposed. . In the present embodiment, the partition plate portion 35 is provided so that the drive pulley 22 is disposed between the two driven pulleys 40 and 40 and is partitioned from the space in which the impeller 50 is disposed.
According to this, it is possible to protect the belt 15 by blocking the flow of air heated by cooling the pump main body 10 toward the belt 15 which is weak against heat. The durability of the device can be improved and the moving efficiency can be improved.

A belt cover 60 covers the driving pulley 22, the two driven pulleys 40 and 40, and the two belts 15 and 15.
The belt cover 60 includes a pair of half cover members 61 and 62 that can be divided into two in the arrangement direction of the three pulleys 22, 40, and 40 and are provided in a fitting relationship. In addition, 63 is an opening part, and it is opening so that the rotating shaft 21 may be passed in the joint part of a pair of half cover members 61 and 62. As shown in FIG.
Thus, since the belt cover 60 is formed in half, it can be suitably mounted without interfering with the drive rotating shaft 21 of the electric motor 20.

A pair of halved cover members 61, 62 are slid from both sides and are mounted, and the pulley 22 on the plate surface of the partition plate portion 35 of the fan cover 30 on the electric motor 20 side so as to be fitted together. Guide rails 65 extending in the arrangement direction of 40 and 40 are provided. Reference numeral 64 denotes a lock portion, which is a connecting and fixing means that fastens the pair of half-split members 61 and 62 together and appropriately fixes them on the partition plate portion 35.
According to this, a pair of half cover members 61 and 62 can be attached suitably and easily. Reference numeral 66 denotes a vent hole that opens to the side of the belt cover 60.

Next, the structure which can cool the pump main body 10 more effectively regarding the main body cover 70 will be described based on FIGS. 9 is a plan view of FIG. 1, and FIG. 10 is a bottom view of FIG.
The main body cover 70 of this embodiment is made of resin and is mass-produced by resin molding. Moreover, the pump main body 10 is a rotary type pump provided with a vane, and the peripheral wall 12 is formed of a metal material.
Reference numeral 80 denotes a support member, which is formed of a frame-like metal material so that the pump body 10 is placed thereon. The contact portion 81 of the support member 80 is in contact with the peripheral wall 12 of the pump body 10 in a state where the contact portion 81 enters the inside of the body cover 70 from the through portion 72 provided in the body cover 70.
According to this, metal materials having high heat transfer performance come into contact with each other, and heat dissipation is suitably performed by conductive heat transfer. Therefore, the pump body 10 can be cooled more effectively.

In addition, at least a part of the upper surface wall of the main body cover 70 is formed by a metal heat radiating plate portion 73 having a lower surface facing the air gap 75 and an upper surface facing the outside. Since the heat dissipation plate portion 73 is made of a high metal material, heat dissipation is preferably performed by heat dissipation by convection including forcing. Therefore, the pump body 10 can be cooled more effectively.

The heat dissipating structure having the above configuration includes a rotary drive type pump body 10 driven by an electric motor, a coupling (not shown) for connecting the rotary shaft 11 of the pump main body 10 and the rotary shaft of the electric motor. Can be suitably applied to a pump device including the same, and an equivalent effect can be obtained.
In the case of a configuration in which power is transmitted from the coupling, the centrifugal fan type impeller 50 has its center plate portion 51 fixed to one of the end faces of the coupling, so that the rotary shaft 11 of the pump body 10 is fixed. It can be mounted so that it rotates together with the axis centered on the same axis.

  As described above, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

It is sectional drawing seen from the side which shows the form example of the pump apparatus which concerns on this invention. It is sectional drawing which looked at the pump apparatus of FIG. 1 from upper direction. FIG. 2 is an overall perspective view in which intake and exhaust cases are mounted on the pump device of FIG. 1. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a perspective view which shows the centrifugal fan type impeller used for the pump apparatus of FIG. It is the perspective view which looked at the impeller of FIG. 6 from the back surface side. It is sectional drawing to which the principal part of FIG. 1 was expanded. It is a top view of FIG. It is a bottom view of FIG. It is a side view including the partial cross section which shows a comparison technique.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pump main body 11 Rotating shaft 12 Peripheral wall 15 Belt 20 Electric motor 21 Drive rotating shaft 22 Drive pulley 30 Fan cover 31 Discharge port 32 Guide wall 35 Partition plate part 40 Driven pulley 41 End surface 42 Female screw part 43 Counterbore part 50 Impeller 51 Core plate 52 Blade 53 Ring plate 60 Belt cover 61 Half cover member 62 Half cover member 65 Guide rail 70 Body cover 73 Heat sink plate 75 Ventilation gap 80 Support member 81 Contact portion

Claims (10)

A pump device comprising: a rotary drive type pump main body driven by an electric motor; and a driven pulley fixed to a rotation shaft of the pump main body and to which a driving force of the electric motor is transmitted via a belt,
A core plate portion that is fixed to an end surface of the driven pulley on the pump body side to cool the pump body and guides the airflow in a direction substantially perpendicular to the axis of the rotating shaft; and A centrifugal fan type impeller provided with a plurality of blades provided on the pump main body side of the core plate portion, and provided so as to rotate together with the rotation axis of the pump main body being coaxial with the axis;
A fan cover that covers the impeller and has a ventilation part through which air is discharged;
The pump device, wherein the impeller includes a ring plate portion that is provided in a ring shape on the pump body side of the plurality of blades and guides the airflow to be throttled .   The said impeller WHEREIN: The said core plate part is formed in disk shape substantially, and the internal diameter of the said ring plate part is formed larger than the outer diameter of this core plate part. Pumping equipment. A pump device comprising: a rotary drive type pump main body driven by an electric motor; and a driven pulley fixed to a rotation shaft of the pump main body and to which a driving force of the electric motor is transmitted via a belt,
A core plate portion that is fixed to an end surface of the driven pulley on the pump body side to cool the pump body and guides the airflow in a direction substantially perpendicular to the axis of the rotating shaft; and A centrifugal fan type impeller provided with a plurality of blades provided on the pump main body side of the core plate portion, and provided so as to rotate together with the rotation axis of the pump main body being coaxial with the axis;
A fan cover that covers the impeller and has a ventilation part through which air is discharged;
In order to fix the impeller to the end surface of the driven pulley on the pump body side with a screw, a female screw portion is provided on the end surface of the driven pulley, and a conical countersunk portion is provided on the female screw portion, and a screw is provided on the core plate portion. A pump device characterized in that a through-hole through which is passed, and a convex portion that is concentrically fitted to the through-hole and fits into the spot facing portion to be positioned are provided. A pump device comprising: a rotary drive type pump main body driven by an electric motor; and a driven pulley fixed to a rotation shaft of the pump main body and to which a driving force of the electric motor is transmitted via a belt,
A core plate portion that is fixed to an end surface of the driven pulley on the pump body side to cool the pump body and guides the airflow in a direction substantially perpendicular to the axis of the rotating shaft; and A centrifugal fan type impeller provided with a plurality of blades provided on the pump main body side of the core plate portion, and provided so as to rotate together with the rotation axis of the pump main body being coaxial with the axis;
A fan cover that covers the impeller and has a ventilation part through which air is discharged;
Two pump bodies are juxtaposed, a drive pulley fixed to a drive rotation shaft of the electric motor by one electric motor, and each driven pulley fixed to each of the rotation shafts of the pump body, It is driven through belts wound between a driving pulley and a driven pulley, and the impeller is fixed to each of the driven pulleys via the core plate portion. Term pump device. The drive pulley is disposed between the two driven pulleys;
A belt cover covering the driving pulley, the two driven pulleys, and the two belts can be divided into two in the arrangement direction of the three pulleys, and a pair of half-cover members provided in a fitting relationship. The pump device according to claim 4, wherein the pump device is configured.   The pair of halved cover members are slid from both sides and mounted, and extend in the direction in which the pulley is disposed on the plate surface on the electric motor side of the partition plate portion of the fan cover so as to be fitted at the center portion. 6. The pump device according to claim 5, further comprising a guide rail provided. A pump device comprising: a rotary drive type pump main body driven by an electric motor; and a driven pulley fixed to a rotation shaft of the pump main body and to which a driving force of the electric motor is transmitted via a belt,
A core plate portion that is fixed to an end surface of the driven pulley on the pump body side to cool the pump body and guides the airflow in a direction substantially perpendicular to the axis of the rotating shaft; and A centrifugal fan type impeller provided with a plurality of blades provided on the pump main body side of the core plate portion, and provided so as to rotate together with the rotation axis of the pump main body being coaxial with the axis;
A fan cover that covers the impeller and has a ventilation part through which air is discharged;
A discharge port provided in a part of a wall constituting the fan cover, so that the fan cover discharges air in a substantially tangential direction concentric with the axis of the rotation shaft by rotation of the impeller; And a guide wall extending in the tangential direction so as to guide air to the outlet. A pump device comprising: a rotary drive type pump main body driven by an electric motor; and a driven pulley fixed to a rotation shaft of the pump main body and to which a driving force of the electric motor is transmitted via a belt,
A core plate portion that is fixed to an end surface of the driven pulley on the pump body side to cool the pump body and guides the airflow in a direction substantially perpendicular to the axis of the rotating shaft; and A centrifugal fan type impeller provided with a plurality of blades provided on the pump main body side of the core plate portion, and provided so as to rotate together with the rotation axis of the pump main body being coaxial with the axis;
A fan cover that covers the impeller and has a ventilation part through which air is discharged;
The fan cover outlets are provided at two locations, one on the diagonal side and one on the other side, respectively.
The guide walls are provided at two locations corresponding to the two discharge ports, and are provided such that the distance from the outer periphery of the impeller gradually increases from the vicinity of one discharge port toward the other discharge port. The pump device according to claim. The body cover surrounding the pump body provides a ventilation gap through which cooling air can flow between the peripheral wall of the pump body,
2. The air gap and the inner space of the impeller are in communication with each other so that air is sucked from the air gap by the impeller to generate an airflow of cooling air. The pump device according to 2, 3, 4, 5, 6, 7 or 8.   The said fan cover is provided with the partition plate part which isolate | separates the space where the said impeller was distribute | arranged, and the space where the said driven pulley and the said belt were distribute | arranged, The pump device according to 3, 4, 5, 6, 7, 8, or 9.

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