JP2017040182A - Motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor pump where abrasion powder arising in a pump chamber during the turn of a rotor and a vane is hardly discharged to the outside.SOLUTION: In a cover member 32, a vent hole 32a communicating the inside of a pump chamber P with a gap to a bottom face 15a and a cover exhaust hole 32b communicated with the gap to the bottom face 15a and penetrating through the cover member 32 are opened. In a casing 31, a casing exhaust pathway 31a communicated with the cover exhaust hole 32b and penetrating through the casing 31 is formed. In a pump arrangement part 13, a housing exhaust pathway 13d communicating the casing exhaust pathway 31a with the outside of a housing 11 is formed. On the bottom face 15a, a filter member 15F is arranged between the vent hole 32a and the cover exhaust hole 32b. The filter member 15F partitions the gap between the cover member 32 and the bottom face 15a into ones on the side of the vent hole 32a and the side of the cover exhaust hole 32b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique of an electric pump that rotates a rotor and a vane in a pump chamber by an electric motor.

  Conventionally, a vane type vacuum pump used as a vacuum pump attached to an automobile engine is known. And as such a vacuum pump, the electric pump which uses an electric motor as motive power may be used. (For example, see Patent Document 1).

JP 2014-25412 A

  In an electric pump configured as in the prior art, wear powder generated when the rotor and vanes rotate in the pump chamber may be discharged to the outside. The present invention provides an electric pump in which abrasion powder generated when a rotor and a vane rotate in a pump chamber is not easily discharged to the outside.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, a hollow housing, an electric motor disposed inside the housing, one opening is fixed to one end surface of the housing, and the other opening is a plate-shaped cover member. A cylindrical casing in which a pump chamber is formed, a rotor rotatably disposed inside the pump chamber by the electric motor, and advancing and retreating from the rotor A vane that is provided and divides the pump chamber into a plurality of working spaces; a bottom face that faces the cover member; and a side face that faces the outer peripheral surface of the casing; and is fixed to one end face of the housing. A silencer that forms a gap between the cover member and the casing, and a suction passage that communicates the outside of the housing and the inside of the pump chamber. In the pump, the cover member includes a vent hole that communicates the inside of the pump chamber and the gap between the bottom surface portion, and a cover exhaust that communicates with the gap between the bottom surface portion and penetrates the cover member. A hole is opened, a casing exhaust passage communicating with the cover exhaust hole and penetrating the casing is formed in the casing, and a housing exhaust that communicates the casing exhaust passage and the outside of the housing is formed in the housing. A path is formed, and one or more filter members are disposed between the vent hole and the cover exhaust hole on the cover member and / or the bottom surface portion, and the one or more sheets are provided. With this filter member, a gap between the cover member and the bottom surface portion is divided into the vent hole side and the cover exhaust hole side.

  As effects of the present invention, the following effects can be obtained.

  That is, according to the electric pump according to the present invention, it is possible to make it difficult for the abrasion powder generated when the rotor and the vane rotate in the pump chamber to be discharged to the outside.

Sectional drawing which showed the electric pump which concerns on one Embodiment of this invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. The perspective view which showed the state which attaches a silencer to a housing. The top view which showed the silencer of the electric pump which concerns on one Embodiment of this invention. (A) And (b) is the XX sectional view taken on the line in FIG. 4, and the YY sectional view, respectively.

  Hereinafter, the electric pump 10 which concerns on one Embodiment of the electric pump of this invention is demonstrated using FIGS. 1-5. In addition, the direction of the electric pump 10 is prescribed | regulated by the arrow shown in each figure. The electric pump 10 is formed in a substantially cylindrical shape as shown in FIG. 3, and includes a housing 11, a silencer 15, a motor unit 20, a casing 31, a rotor 41, vanes 42, 42,. Yes. Hereinafter, each component will be described in order.

  The housing 11 is a hollow cylindrical member, and includes a motor accommodating portion 12 that accommodates the motor portion 20 and a pump disposing portion 13 in which the pump portion 30 is disposed. The motor housing portion 12 is formed in a bottomed cylindrical shape with one opening. The pump disposition portion 13 is formed in a substantially disc shape and closes the opening of the motor housing portion 12. The pump disposition portion 13 is formed with a fixing flange 13a extending outward in the radial direction at the outer peripheral edge portion.

  The motor unit 20 is an electric motor disposed inside the motor housing unit 12, and includes a shaft 21, bearings 22 and 22, a brush 23, a commutator 24, a coil 25, a magnet 26, and the like as its constituent elements. The shaft 21 is rotatably supported by bearings 22 and 22 fixed to the motor housing portion 12. The magnet 26 is fixed to the inner peripheral surface of the motor housing portion 12. And the coil 25 is rotatably arrange | positioned at the shaft 21 with the clearance gap inside the radial direction of the magnet 26. As shown in FIG.

  The commutator 24 is integrally attached to the shaft 21 and is electrically connected to the coil 25. The brush 23 is disposed outside the outer peripheral surface of the commutator 24 and energizes while relatively slidingly contacting the commutator 24. In the motor unit 20 configured as described above, a voltage is applied to the coil 25 from the external power source via the brush 23 and the commutator 24, and the shaft 21 is rotationally driven.

  The casing 31, the cover member 32, the rotor 41, the vane 42, etc. constitute the pump unit 30 in the electric pump 10. The pump unit 30 in the present embodiment is a vane vacuum pump and is disposed in the pump disposition unit 13.

  The casing 31 is a cylindrical member, and a lower opening is fixed to the upper end surface of the pump disposition unit 13. A cylindrical pump chamber P is formed inside the casing 31 by closing the opening above the casing 31 with a plate-like cover member 32. The casing 31 and the cover member 32 are fixed to the pump disposition portion 13 by three bolts 33 that are fixtures.

  The rotor 41 in the pump unit 30 is connected to the tip of the shaft 21 through the key 27 so as not to be relatively rotatable. That is, the rotor 41 is rotatably disposed inside the pump chamber P by the rotational drive of the shaft 21 in the motor unit 20. The rotor 41 is arranged in an eccentric state inside the pump chamber P. A plurality of vanes 42, 42... Are inserted into grooves formed in the rotor 41 so as to be movable in the radial direction of the rotor 41. When the rotor 41 is rotated by driving the motor unit 20, the vanes 42, 42,... And the front-end | tip part of vane 42 * 42 ... is slidably contacted with the internal peripheral surface of pump chamber P, and vane 42 * 42 ... upper-lower-end surface contacts the cover member 32 and the pump arrangement | positioning part 13, respectively. Thereby, the pump chamber P is partitioned into a plurality of working spaces, and the airtightness of the adjacent working spaces is maintained. The volume of the working space partitioned by the vanes 42, 42... Increases / decreases with the rotation of the rotor 41, so that gas (for example, air) is sucked, compressed, discharged (discharged), and the pump A negative pressure is generated inside the chamber P.

  The inside of the pump chamber P communicates with the outside of the housing 11 through a suction passage 13 b formed in the pump disposition portion 13. The suction passage 13b communicates with an intake pipe 14 extending rightward. The suction passage 13 b and the intake pipe 14 function as a gas intake path in the electric pump 10. Further, the inside of the pump chamber P communicates with the upper side of the cover member 32 through a vent hole 32 a opened in the cover member 32.

  The silencer 15 is a member formed in a bottomed cylindrical shape whose upper side is closed and whose lower side is opened. As shown by an arrow D in FIG. 3, a pump is provided covering the outside of the casing 31 and the cover member 32. Arranged in the section 13. The silencer 15 includes a bottom surface portion 15a, a side surface portion 15b, and a fixing flange 15c. By fixing the silencer 15 with the plurality of fasteners 17 including bolts and nuts in a state where the fixing flange 15c of the silencer 15 and the fixing flange 13a of the pump installation portion 13 are in contact with each other, the silencer 15 can Fixed to the upper end surface. An annular groove 13c is formed in the fixed flange 13a, and a seal member 16 is fitted into the annular groove 13c. Thereby, the sealing member 16 is inserted between the fixed flange 15c and the fixed flange 13a, and the airtightness of the internal space of the pump chamber P is ensured.

  When the silencer 15 is arranged in the pump arrangement part 13, a gap is formed between the inner peripheral surface of the silencer 15 and the casing 31 and the cover member 32. Specifically, the bottom surface portion 15 a of the silencer 15 faces the cover member 32 with a gap therebetween, and the side surface portion 15 b of the silencer 15 faces the outer peripheral surface of the casing 31 with a gap provided therebetween. Thus, the vent hole 32a opened in the cover member 32 communicates the gap between the cover member 32 and the bottom surface portion 15a with the inside of the pump chamber P.

  Further, the cover member 32 has a cover exhaust hole 32 b that communicates with the gap with the bottom surface portion 15 a and penetrates the cover member 32. The casing 31 is formed with a casing exhaust passage 31 a that communicates with the cover exhaust hole 32 b and penetrates the casing 31. Further, a housing exhaust path 13 d that connects the casing exhaust path 31 a and the outside of the housing 11 is formed in the pump disposition portion 13 of the housing 11. The vent hole 32a, the cover exhaust hole 32b, the casing exhaust path 31a, and the housing exhaust path 13d function as a gas exhaust path in the electric pump 10 discharged from the pump chamber P.

  In the electric pump 10 configured as described above, when the rotor 41 is rotated by driving the motor unit 20, the gas is sucked into the pump chamber P through the intake path including the suction passage 13 b and the intake pipe 14. The gas compressed in the pump chamber P is discharged from the vent hole 32a into the gap between the silencer 15 and the cover member 32. Further, the gas is exhausted to the outside of the electric pump 10 through an exhaust path including the cover exhaust hole 32b, the casing exhaust path 31a, and the housing exhaust path 13d. At this time, the sound leaking to the outside is reduced by flowing the gas through the gap between the silencer 15 and the cover member 32.

  In the electric pump 10 according to the present embodiment, a filter member 15F is disposed on the inner peripheral surface of the bottom surface portion 15a of the silencer 15 between the vent hole 32a and the cover exhaust hole 32b. The filter member 15F divides the gap between the cover member 32 and the bottom surface portion 15a into a vent hole 32a side (rear side) and a cover exhaust hole 32b side (front side). In the present embodiment, the roughness (fineness of the mesh) of the filter member 15F is smaller than the particle size of the wear powder generated by friction with the inner peripheral surface of the casing 31 when the rotor 41 and the vane 42 are rotated. It is configured as follows.

  By configuring as described above, the gas discharged from the pump chamber P to the gap between the silencer 15 and the cover member 32 through the vent hole 32a is as shown by a broken line arrow F in FIGS. 4 and 5A. After flowing through the filter member 15F, it flows into the cover exhaust hole 32b.

  In the present embodiment, by configuring as described above, when the rotor 41 and the vane 42 are rotated inside the pump chamber P, the abrasion powder generated by the friction with the inner peripheral surface of the casing 31 is hardly discharged to the outside. can do. Specifically, even when the wear powder is discharged from the vent hole 32a together with the gas, the wear powder can be retained by the filter member 15F without passing through the filter member 15F. Thereby, since it is possible to suppress the wear powder from flowing into the cover exhaust hole 32b, it is possible to reduce the wear powder discharged to the outside of the electric pump 10 through the exhaust path.

  Even if a large amount of wear powder adheres to the filter member 15F and the filter member 15F is clogged, the gas containing the wear powder flows away from the filter member 15F and then flows into the cover exhaust hole 32b. Inflow. More specifically, the gas discharged from the vent hole 32a flows in the left-right direction after passing through the gap between the cover member 32 and the bottom surface portion 15a and then hitting the filter member 15F. And it passes between the casing 31 and the side part 15b of the silencer 15, and flows into the cover exhaust hole 32b again from the gap between the cover member 32 and the bottom part 15a. At this time, the abrasive powder can be dropped between the casing 31 and the side surface portion 15b of the silencer 15 by colliding with the filter member 15F. As described above, since the wear powder can be prevented from flowing into the cover exhaust hole 32b, even if the filter member 15F is clogged, the wear powder discharged to the outside of the electric pump 10 via the exhaust path is reduced. Can be reduced.

  In the present embodiment, the filter member 15F is disposed only on the bottom surface portion 15a of the silencer 15. However, the filter member is disposed on the cover member 32, and both the bottom surface portion 15a and the cover member 32 are disposed. It is also possible to arrange them in the above manner. Moreover, the structure which arrange | positions several filter members is also possible. That is, as long as the filter member is disposed between the vent hole 32a and the cover exhaust hole 32b, the number of objects and barriers on which the filter member is disposed is not limited. Further, in the present embodiment, there is a gap between the filter member 15F and the cover member 32. However, from the viewpoint of retaining wear powder, the filter member 15F and the cover member 32 may be in contact with each other. preferable.

DESCRIPTION OF SYMBOLS 10 Electric pump 11 Housing 13 Pump installation part 15 Silencer 15a Bottom part 15F Filter member 31 Casing 31a Casing exhaust path 32 Cover member 32a Vent hole 32b Cover exhaust hole

Claims (1)

A hollow housing;
An electric motor disposed inside the housing;
A cylindrical casing in which one opening is fixed to one end surface of the housing and the other opening is closed by a plate-like cover member, thereby forming a pump chamber therein;
A rotor rotatably arranged inside the pump chamber by the electric motor;
A vane provided so as to be able to advance and retreat from the rotor and partitioning the pump chamber into a plurality of working spaces;
A silencer comprising a bottom surface portion facing the cover member and a side surface portion facing the outer peripheral surface of the casing, and being fixed to one end surface of the housing, thereby forming a gap between the cover member and the casing. When,
In the electric pump comprising: a suction passage that communicates the outside of the housing and the inside of the pump chamber;
The cover member has a vent hole communicating with the gap between the inside of the pump chamber and the bottom surface portion, and a cover exhaust hole communicating with the gap between the bottom surface portion and penetrating the cover member. And
The casing is formed with a casing exhaust passage that communicates with the cover exhaust hole and penetrates the casing.
The housing is formed with a housing exhaust path that communicates the casing exhaust path with the outside of the housing.
In the cover member and / or the bottom surface portion, one or a plurality of filter members are disposed between the vent hole and the cover exhaust hole,
The electric pump characterized in that a gap between the cover member and the bottom portion is partitioned by the one or a plurality of filter members into the vent hole side and the cover exhaust hole side.

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