JPS5888485A - Pump device driven by means of electric motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention comprises a pump device, preferably driven by an electric motor, for actuating a central switchgear of a motor vehicle, which comprises a vane pump with a casing made of synthetic resin. , the vane pump is equipped with two medium channels for introducing and removing pressure medium, in particular air (the casing of the vane pump is preferably connected to the casing of the electric motor via an approximately tubular adapter part also made of synthetic resin). , preferably of the type that is attached to a bearing seal-bee-like end carper of an electric motor.In known pump devices of this kind, the medium duct for introducing and removing the pressure medium is located outside the pump housing. When operating such a pump device, the flow noise and motor noise generated during operation can be extremely unpleasant, especially when gaseous pressure media such as air are used. I knew I could feel it.

This applies in particular if the known pump device is installed in a motor vehicle and is intended to be used to operate a central switchgear.

In this case, air vibrations and object vibrations generated by the pump device are transmitted to the vehicle body without being damped, and the vehicle body acts as a resonator plate.

The advantage of the Ponzo' device according to the invention is that the flow noise of the pump device can be reduced inexpensively by utilizing the structurally necessary hollow space of the pump device as a so-called vibration damping chamber.

Advantageous embodiments of the invention are described in the following claims. It is particularly advantageous if the interior of the adapter, which is delimited and closed by the casing of the vane pump on the one hand and of the casing of the electric motor on the other hand, is inserted into the cane pump of the electric motor via at least one through hole which is designed as a throttling point. 1, whereby a second vibration damping chamber ``is connected afterwards to the above-mentioned overhead vibration damping chamber'', and this second vibration damping chamber is necessarily connected to the pressure medium. is passed through during operation of the pumping device.Therefore, the aforementioned flow noise-4i is further attenuated without structural changes that would increase the weight or volume of the pumping device.Firstly, an embodiment of the invention will be explained with the aid of the drawings. I will explain in detail.

The illustrated pumping device essentially consists of a vane pump l and an electric motor 2. The original vane pump has stroke ring 3.
A cylindrical casing notch 4 is eccentrically formed in the stroke cylinder. In the axial direction, the housing recess is bounded by two side plates 5, 6, the outer diameter of which corresponds to the outer diameter of the stroke ring 3. The stroke ring 3 and the side plates 5.6 are secured by pins 7 so that they do not shift from each other. : A rotor 8 is disposed in the casing notch concentrically with respect to the outer periphery of the vane pump, and vanes 10 are slidably guided in a sealed state within the radial slits 9 of the rotor. There is. The page 710 is in contact with the cylindrical inner wall of the casing notch with its outer edge, and individually opens a substantially sickle-shaped working chamber formed between the outer peripheral surface of the rotor 8 and the inner wall of the casing notch. It is divided into compartments.

The rotor is guided on a pump shaft 11, which is held in a bearing hole formed axially in the side plates 5, 6. The vane pump, which is axially limited by the side plates 5, 6, is covered from above with a protective force A-13 and is fastened by three sinking screws 12 to the flange 14 of the approximately cylindrical adapter part 15. . The adapter part 15, as can be seen in FIG. 1, is of tubular design and has an end wall 16 near its end opposite the flank 14. The end wall 16 is mounted with its end face on the bearing shield-like end force mer 17 of the electric motor 2 and is fixed there by means of cylindrical head screws 18.

The adapter part is aligned in the radial direction by a section of a cylindrical wall which projects beyond the end wall 16 on the side opposite the vane pump 1 and which extends beyond the cylindrical wall of the casing of the electric motor 2. It is in contact with the outer circumferential surface.

In the interior space 19 of the adapter part 15, the pump shaft 11 and the shaft 20 of the electric motor 2 are connected in a resilient connection 2, which is known per se.
1.

In the illustrated embodiment, the stroke ring 3 and the side plates 5, 6 are made of synthetic resin, whereas the protective brackets
13 and the adapter part 15 may consist of aluminum wool. Of course, the protective cover and the adapter part may also be made of synthetic resin.

As the rotor 8 rotates, the size of the compartment divided by the base 710 in the casing notch Φ changes. In each region near the melon where the outer circumferential surface of the rotor 8 and the inner circumferential surface of the cylindrical 7 of the casing notch are in approximate contact, one pressure is applied to one section in a manner known per se, as shown by a dashed line. Media passages 22゜23(
(Fig. 2) is formed. One medium passage 22 opens into the interior chamber 19 of one adapter part 15, as shown in FIGS. 1 and 3.

The other medium channel 23 is covered radially inwardly in the plane of the flange 14 by a projection 25 . Protrusion 2
5 has a connecting pipe 26.

A medium passage 23 opens into this connecting pipe.

The closed inner chamber 9 of the adder and the starter part 15 is connected to the inner chamber of the casing of the electric motor 2 (known in the art) through a through hole 24 whose flow cross section is approximately the same size as the flow cross section of the medium channel 22. (not shown). Of course, in special embodiments, the through hole 224 can also be designed as a throttle point. On the side facing the electric motor 2, the through-hole 24 has an enlarged portion 27, which is covered by a filter plate 28, which is preferably constructed as a wire mesh.

The interior of the electric motor 2 is connected to the outside of the electric motor 2 via an opening 29 located opposite the end cover 17 and formed in the casing wall. In this case, the aperture is
It may be covered with an open cell foam layer (not shown) which acts as a vibration damping member.

A hose molding 30 made of rubber or a similar damping material is inserted into the connecting tube 26, through which the medium channel 23 extends. Via the T-branch 31 of the hose profile 30, the medium channel 23 controls the function of the electric motor 2 by means of a pressure switch 32 actuated by a diaphragm and in conjunction with an electronic control circuit arranged on the circuit plate 33. control. In the T-branch of the hose profile 30, in the conduit leading to the pressure casing inch 32, a large section 35 with a throttling point 34 is arranged 3, the throttling point being of course in the T-branch, a pressure switch 3.
It may be integrally molded directly into the conduit leading to 2.

The free end 36 of the hose profile 30 forms the outlet of the pump device.

As can be seen from the drawing, the vane pump pressure indentation 32 and the hose profile 30, which are connected to the electric motor 2 via the adapter part 15, are arranged together with the circuit plate 33 in the inner chamber of the outer casing. The outer casing has a box-shaped part 38 closed from above by a cover 37, which part has a cylindrical extension 39 on the side opposite the catch 37. The box-shaped part 38 and the cylindrical extension 39 are glued together in the exemplary embodiment. Power/Mar 3
7 is likewise glued to the box-shaped part 38 or held by a locking mechanism known per se.

An opening 40 is formed in the forceps 37, through which the inner chamber of the outer casing 37 is connected to atmospheric pressure. The aperture 40 may be covered with a burr made of a special open cell foam member.

Inside the cylindrical extension 39, an electric motor 2 is secured together with a vane pump 1 mounted on it using molded rings 41 and 42 made of rubber or another elastic material. This is ensured by the shape. The axial electric motor is held by an elastically deformable rubber ring 43 which rests on a molded ring 42 on the lower side and is supported inside the force A-37 on the upper side.

Connection cable 44 guided inside the inner chamber of the outer casing.
45 and the connecting conductor 45 leading to the circuit plate 33, the electric motor is controlled. The electronic control circuit arranged on the circuit plate 33 is supplied with current via the connecting conductor indicated by the dashed line 1. Cylindrical extension 3 of the outer casing
The inner chamber of 9 is connected to the box-shaped part 3 of the outer casing by means of a molded ring 41 fitted under a light preload.
It is separated from 8 interior rooms.

The molded ring 41 is therefore provided with a number of flow openings 47 which connect the two interior chambers to each other.

The pump device of the embodiment functions as follows: Rotating arrow 4
During the rotation of the rotor 8 in the direction 8 (FIG. 2), pressure medium is sucked in via the medium duct 23;
Negative pressure is generated within 3. In this direction of rotation, the vane pump acts as a suction source. The pressure medium discharged via the medium channel 22 passes into the inner chamber 19 and from there via the inner chamber of the electric motor 2 and the opening 29 into the inner chamber of the cylindrical extension 39 of the outer casing 1; From there the pressure medium passes through the flow opening 47 to the opening 4 of force/ζ-37.
0, from which the pressure medium can flow out into the surroundings. Via the pressure switch 32, the electric motor 2 is activated whenever the underpressure, for example, has not yet reached the set value. In certain applications, it may also be necessary to operate the pump 1 as a pressure source; for this purpose, an electronic control circuit in the circuit plate 33 is used to reverse the polarity of the current supply conductor to the electric motor 2; As a result, the motor 8 rotates in the opposite direction to the rotation arrow 48.

If the forward evacuation direction is reversed, a pressure is generated in the medium passage 23 that is increased relative to the external pressure.

Flow noises, motor noises of electric motors, etc. which occur during the functioning of the vane pump and which significantly interfere with the use of the pump device in a motor vehicle for actuating the central opening and closing rack or other operating devices; Further noises caused by the movement of mechanical parts are damped significantly by the structure according to the invention. Furthermore, the flow noise is damped very strongly by the fact that the inner chamber of the outer casing, the inner chamber of the electric motor 2 and the inner chamber 19 of the adapter part 15 act as a vibration-damping chamber connected one behind the other. The pump device and the outer casing are connected in a state where object vibrations are isolated by molded rings 41 and 42 made of rubber or a similar material having a damping effect, and by rubber rings 3 and 7, which are also formed by a port molded piece 30. Also, the connection between the pump device and the outer casing is made in such a way as to isolate object vibrations. The throttling point 3 has a pressure switch 32 coupled to the outer casing so as to transmit vibrations.
This produces an air vibration isolation effect. Due to the throttling point, only a somewhat static pressure is generated in the pressure switch, so that dynamic pressure fluctuations that would cause vibrations in the pressure switch do not reach the pressure switch. Of course T-
The rubber material of the branch also produces an object vibration isolation effect. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a pump device according to an embodiment of the present invention;
2 is a sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a plan view showing the pump device of FIG. 1 in a state where the force ζ- is taken. 1... Vane pump, 2... Electric motor, 3...
Stroke ring, 4...Casing notch, 5 and 6...
・Side plate, 7...Pin, 8-...Rotor, 9...S IJ
Cut, 10... Vane, 11... Pump shaft, 12...
・Sinking head screw, 13...Protection power/S-1■4...Franz, 15-...Adashita part, 16...End wall, 17
... End cover, 18... Cylindrical head screw, 19.
...Inner chamber, 20...Shaft, 21...Connecting portion, 22 and 23...Medium passage, 24...Through hole, 25...Protrusion, 26...Connecting pipe, 27...・Enlarged part, 28...
- Filter plate, 29... Opening, 30'... Hose molded piece, 31... T-branch, 32... Pressure switch, 33... Switch Solate. 34...Aperture area, 35...Yes, most of it, 36...
・Free end, 37...Cut ζ-138...part, 3
9... Additional portion, 40... Opening, 41 and 42...
Molded ring, 43...-Rubber ring, 44 and 45...
・Connection cable, 45...Connection conductor, 46...Connection conductor, 47...Flow opening, 48...Rotation arrow

Claims (1)

[Scope of Claims] (1) A pump device driven by an electric motor, the vane pump having a casing and two medium passages through which pressure medium is introduced and discharged; In those types in which the casing is attached to the casing of the electric motor via a substantially tubular adapter part, one medium passage (22) opens into the adapter part (15) σ interior chamber (19). It is characterized by A pump device that is also driven by an electric motor. 2. The closed inner chamber (1;l) of the adapter part (15)
2. Pump device according to claim 1, wherein the pump is connected to the interior of the housing of the electric motor (2) via at least one through hole (24). 3. The inner chamber of the electric motor (2) has at least one opening (2) formed in the wall of the casing of the electric motor at a point opposite to the through hole (24) of the casing of the electric motor (2).
9) The pump device according to claim 2, wherein the pump device is connected to the outside of the electric motor via a pump. 4. A pump device according to claim 3, wherein the opening (29) is covered with a layer of open-celled foam material. 5. The flow cross section of the through hole (24) is the adapter part (15
4. The pump device according to claim 2, wherein the pump device has approximately the same size as the flow cross section of the medium passageway (22) opening into the inner chamber (19) of the pump. 6. The adapter part (15) has an end wall (16) in which a through hole (24) leading to the interior of the electric motor (2) is arranged. Section 2~
Pump device according to any one of clause 5. 7. The through hole (24) has an enlarged portion (27) towards the electric motor (2), and this enlarged portion is covered by a filter plate (28). pump equipment. 8. Pump device according to any one of claims 1 to 7, wherein a further medium channel (23) extends in a connecting pipe (26) arranged in the adapter part (15). . 9. The further medium channel (23) extends through a hose profile (30) made of rubber or a similar material. The pumping device 3, η, the medium passage (23) is connected to the control chamber of the pressure switch (32), the pressure switch controlling the electric motor (2) of the pumping device (2). The pump device according to item 9. 1. Pump device according to claim 10, characterized in that an integrally molded constriction point (34) is arranged in the conduit leading to the pressure switch (32). A vane having a vane movable within a slit (9) in the radial direction of the pump rotor, the P pump (1) operating as a pressure source or a suction source depending on the direction of rotation. - The pump device according to any one of paragraphs 11 to 12. B. Vane pump (1) coupled to electric motor (2)
, a pressure switch (32), a hose molded piece (30), and
Claims 1 to 12, in which the circuit grate, which optionally holds the electronic control circuit, is arranged in the inner chamber of the outer gong with its position adjusted by means of a holding member that damps object vibrations. The pump device according to any one of the clauses. ■4. The outer case song has a box-shaped part (38) whose upper side is closed by force ζ-(37) and force ζ-(37).
), which consists of a cylindrical extension (39) arranged on the side opposite the cylindrical extension, in which an electric motor (2) is connected with a vane pump (1) attached to this electric motor. Claim 13, which is unrotatably arranged in
Pump device as described in section. 15. Claim 1, wherein the electric motor shaft and the pump shaft (1) are connected to each other by an elastic connection (21) arranged in the interior chamber (19) of the adapter part (15). Pump device as described in section. 16. The inner chamber of the outer casing has an opening of force ζ-(37) (
40) to atmospheric pressure. 17. Pump device according to claim 13, wherein the inner chamber of the outer casing, through which the pressure medium passes, is divided into individual chambers.