JPS585113Y2 - Distribution valve for rotating piston machinery - Google Patents

Description

[Detailed description of the invention] The invention is a distribution valve for a rotary piston machine, which comprises a side plate serving as a stationary valve part, and a rotating valve disk connected to the rotor in a manner immovable relative to the rotor. and in which the side plates are held between casing parts fastened together by screws.

In the known rotary piston machine (DE 1931144), the disc-shaped clamping is applied to the casing part, to the ring surrounding the inner valve plate, to the side plate, to a further intermediate disk and to the outside. The stator is held together via a tightening screw.

The valve disc rotates on a central pin that is clamped into the casing part.

In this case, the side plates are centered via clamping screws and the valve disk via pins.

The object of the invention is to provide a distributor valve of the type mentioned at the outset, which allows extremely precise centering in a simple manner.

The gist of the present invention to solve this problem is that the side plate has a bearing bushing in the central hole, and
The rotating valve disk is supported on a bushing, and the side plate and the adjacent stator have the same diameter, and the outer circumferential surface of the side plate and the stator is one of the casing parts. surrounded by a common central concentric web projecting in the axial direction, and at least one of the side plate and the valve disc consists of two ring plates soldered to each other, one of the ring plates being , the ring plate facing at least one of the side plate and the valve disc is characterized in that the bearing has a relatively large content for receiving the bushing.

In this configuration, the valve disc is held to the side plate only through the bearing bushings.

This ensures that the valve disk and side plate are precisely centered with respect to each other.

The bushing of the bearing is arranged in such a position that a hole for a member connecting the rotor and the valve disk, such as an articulation shaft, is provided in the valve disk and the side plate.

In this case, this bearing bushing does not really require any additional space.

In addition, this bearing has a relatively small circumferential velocity of the valve disc on the bushing due to the small circumference of the bushing.

The low circumferential speed also applies in the case of the opposite construction in which the bearing is fixedly press-fitted into the valve disk and rotates in the side plate.

According to the present invention, the side plate and the stator adjacent to the side plate have the same diameter, and the outer circumferential surface of the stator and the outer circumferential surface of the side plate protrude in the axial direction of the casing portion. surrounded by a common concentric web of
As a result, the stator and the side plates are directly centered with respect to each other via this centering web.

All three cooperating parts, namely the stator, the side plate and the valve disk, therefore occupy mutually advantageous positions.

Furthermore, a pressure piston is placed on the end face of the valve disc facing away from the side plate, which pressure piston is loaded mechanically and/or hydraulically in the direction of the valve disc.

This pressure piston forces the valve disc into close contact with the side plate, thus ensuring perfect valve function.

Since the pressure piston is hydraulically loaded in connection with the pressurization, the crimping force is adapted to the pressure to be sealed.

The pressure histone is preferably centered by an inner circumferential surface, one of which is coaxial with respect to the centering web of the housing part.

The valve disk and the pressure piston are therefore precisely centered with respect to each other via the housing part.

In another advantageous embodiment of the invention, the valve disc has a first set of valve openings opening in the outer circumference of the valve disc and a second set opening in the end face of the valve disc opposite the side plate. valve openings are provided alternately, and the distribution chamber in contact with the outer circumferential surface and the distribution chamber in contact with the end surface are located at the end surface of the valve disc on the side opposite to the side plate. It is partitioned by a formed annular contact surface.

It is effective if an annular groove is provided on the end face of the valve disc facing the side plate, and this annular groove is connected to the valve opening opening on the end face of the valve disc located on the opposite side from the side plate. be done.

By providing this annular groove, it is possible to increase the end face of the valve disc on the side facing away from the side plate and the effective area of the pressure piston, which results in a correspondingly larger and therefore less resistant cross section. It is possible to provide a connection hole having a diameter.

An annular chamber connected to one connection is provided between one clamping part of the pressure piston and the casing part, and this annular chamber is connected to the pressure piston and the valve disk through a hole in the pressure piston. It is particularly advantageous if the annular groove is connected to the first set of valve openings via a channel in the valve disk.

Furthermore, an annular chamber connected to the other connection part may be provided in contact with the outer peripheral surface of the valve disc, and this annular chamber may be connected to the second set of valve openings via another passage in the valve disc. can.

In this way, an extremely compact configuration is obtained.

According to the present invention, at least one of the side plate and the valve disk,
It consists of two mutually soldered ring plates, of which one ring plate, on the side facing at least one of the side plate and the valve disk, is relatively inwardly disposed to receive the bearing bushing. It has a large inner diameter.

By using two ring plates, even complex passages can be created in the side plate or valve disc.

The bearing is particularly effective if a precisely defined receiving chamber for the bushing is formed.

Furthermore, the valve disc is carved out of two mutually soldered ring plates, one of which has a radially elongated throat-shaped valve opening, and furthermore, the valve disc has a valve opening in the form of a radially elongated slot. Advantageously, holes having a large diameter compared to the width are provided in the other ring plate in such a way that they communicate with the slots alternately from the outer circumferential surface and the end face of the other ring plate.

In this case, at least one of the side plate and the valve disc is manufactured from two ring plates having different thicknesses and thicknesses, and the thinner ring plate is arranged facing at least one of the side plate and the valve disc. Good.

The opening of the axial channel in the side plate or the valve opening in the valve disk can be produced in the thinner ring plate with great precision by precision stamping.

The invention will now be described with reference to the illustrated embodiment.

If the illustrated rotary piston machine is assumed to be a motor, this rotary piston machine can be selectively supplied with pressurized fluid via connection 1 or 2; The low pressure liquid is discharged and the drive output is transmitted to the shaft.

By driving the shaft 3, this rotary piston machine can also be used as a pump.

The casing has two casing parts 4 and 5, between which an outer stator 6 and two side plates 7 and 8 are provided.

For double tightening, the casing parts 4 and 5 are fitted with four tightening screws 9.
When clamped together via the housing parts 4, 5, these clamps act on the side plates 7, 8 and the outer stator 6 at the end faces 10 and 11, tightening these side plates 7,8 and the outer stator 6.

The outer stator 6 has a cylindrical outer peripheral surface 12 .

The diameter of the outer stator 6 and the diameters of the side plates 7 and 8 are equal to each other.

The concentric web 13 of the casing part 4 is tightened by sliding friction between the entire outer circumferential surface of the side plate 7 and the outer circumferential surface 1 of the outer stator 6.
It is covered by the second part of 2.

The concentric web 14 of the casing part 5 is tightened by sliding friction between the entire outer circumferential surface of the side plate 8 and the outer circumferential surface 1 of the outer stator 6.
It is covered with part of 2.

A flange 15 narrower than the stator 6 is provided on the outer circumferential surface 12 of the outer stator 6, and this flange 15 substantially fills the gap between the two centering webs 13 and 14. .

The shaft portion of the tightening screw 9 is attached to the cylindrical outer peripheral surface 1 of the outer stator 6.
It extends outside of 2.

The flange 15 is provided with holes or recesses through which the tightening screws 9 pass.

For tightening, the casing part 4 is closed on the outer end side by a cover 17.

For tightening, the casing part 4 has a double rolling bearing 18, via which the shaft 3
The shaft hollow part 19 of is supported.

The teeth 20 of this shaft hollow part 19 mesh with a toothed head 21 provided at one end of the first joint shaft 22, and the toothed head 23 located at the other end is connected to the rotor 2 formed as a toothed ring.
It meshes with the internal teeth 24 of No. 5.

The external teeth 27 of this rotor and the internal teeth 26 of the outer stator 6 form push chambers which are connected to the connections 1 or 2 in the correct order via a distribution valve. .

To form a distributor valve, the side plate 8 has a bearing bush 28 in its bore, on which a rotating valve disk 29 is supported.

This valve disk 29 is connected to the rotor 25 through a second joint shaft 30 so as to be unable to rotate with respect to the rotor 2S,
Moreover, the first toothed head 31 of this second joint shaft 30
The second toothed head 32 meshes with the internal teeth of the rotor 25, and the second toothed head 32 meshes with the internal teeth 33 of the valve disk 29.

A pressure piston 34 is provided to press the valve disk 29 tightly against the side plate 8.

The central pin 35 serves as an axial stop for the second articulation shaft 30 and prevents the transmission of axial loads to the valve disk 29 or the pressure piston 34.

The side plates 8 have axial channels 36, each of which is assigned to a tooth slot in one of the inner teeth of the outer stator 6.

Accurate angular position is ensured by pins 66.

The valve discs 29 alternately have valve openings 37 connected to the connection 1
and a valve opening 38 connected to the X' connection □2.

These valve openings 37, 38 are each provided as many times as there are teeth of the rotor 25.

One passage 39 leads from each valve opening 37 into an annular groove 40 .

This annular groove 40 is connected to an annular chamber 42 via passages 41 which are provided in the pressure piston 34 as many as there are axial passages 36 .

This annular chamber 42 is formed between the clamping casing part 5 and the pressure piston 34.

This annular chamber 42 is directly connected to the connection part 1 .

The valve openings 3 , 8 are each connected via an inclined channel 43 to an annular chamber 44 , which is connected to the valve disk 2 .
It surrounds 9.

This annular chamber 44 is directly connected to the connection part 2 .

The pressure piston 34 is guided in its tightening by two concentric inner peripheral surfaces 45 and 46 of different diameters of the casing part 5 and is made non-rotatable by a pin 47.

This pressure piston 34 is pressed against the valve disk 29 by means of the spring or springs 48 and by the pressure exerted in the annular chamber 42 or in the annular gap 65 of the annular chamber 44, so that the valve disk 29 is tightly sealed. It is crimped onto the side plate 8.

In the end wall facing the rotor 25, both side plates 7 and 8 have grooves 49, 50 starting from the outer circumferential surface, in which a sealing ring 51. 52 people are said to be like that.

These sealing rings serve to prevent pressurized fluid from venting outwardly through the interface between the outer stator 6 and the side plates 7,8.

However, these sealing rings 51,52 themselves are not pressed outwardly by the liquid.

As is clear from FIGS. 2 and 3, the side plate 8 is composed of a thick ring plate 53 and a thin ring plate 54.

The two ring plates 53, 54 are fixed to each other by pins 55 and are connected to each other by copper soldering.

The inner diameter 56 of the ring plate 54 is larger than the inner diameter 57 of the ring plate 53.

As a result, the bearing has a limited receiving chamber for the bushing 28.

A blind groove 67 having the same cross section is provided between two adjacent axial channels 36, and these blind grooves 67 form a pressure balance.

Similarly, in the valve disc 29 shown in FIGS. 4 and 5, a thin ring plate 58 and a thick ring plate 59 are fixed to each other via pins 60 and are fixedly fixed to each other by copper soldering. combined.

The inner diameter 61 of the ring plate 58 is larger than the inner diameter of the tooth ring 33.

As can also be seen, valve openings 37 and 38 are stamped into ring plate 58.

These valve openings 37, 38 are connected at the inner and outer ends by arcs.

It has the shape of a radial slot with parallel side walls.

The thick ring plate 59 has an annular groove 40 before soldering.
We only have the following.

Passages 39, 43 are formed for draining the wax liquid, but the diameter of these holes is large compared to the circumferential width of the valve opening 37.38, and these holes are cut deeply into the valve opening 37.38. This results in a flow path with the least resistance possible.

An annular surface 62 on the end surface of the ring plate 59 has an annular groove 40.
serves as a seal between the annular chamber 44 and the annular chamber 44.

The annular surface 53 serves as a seal between the annular groove 40 and the inner cavity.

An annular groove 64 in the end face of the valve disk facing side plate 8 is connected to valve opening 37 .

This results in an increase in the effective pressure surface of the annular chamber 42.

The cross-sections of the passages 39 and 41 can be correspondingly large and free of resistance.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the rotary piston machine of the present invention, Fig. 2 is a detailed sectional view of the side plate of the rotary piston machine of the present invention, and Fig. 3 is a detailed sectional view of the side plate of the rotary piston machine of the present invention.
2 is a plan view of FIG. 2, FIG. 4 is a detailed cross-sectional view of the valve disk of the rotary piston machine of the present invention, and FIG. 5 is an end view of FIG. 4. 1.2... Connection part, 3... Axis, 4, 5
...Tighten the casing part, 6...Outer stator, 7, 8...Side plate, 9...Tightening screw, 13.14... - Determined web, 15...
...7 lunge, 22...1st joint axis, 23
...Toothed head, 25...Rotor,
28... Bearing is bush, 29... Valve disc, 45, 46... Inner peripheral surface, 53...
・Thick-walled link plate, 54...Thin-walled ring plate.

Claims (1)

[Claims for Utility Model Registration] A distribution valve for a rotary piston machine, which has a side plate serving as a metering valve part and a rotating valve disk connected to the rotor in a manner immovable relative to the rotor. In the type in which the side plate is held between the casing parts tightened together by □ screw 1, the side plate 8 has a bearing bush 28 in the central hole □ b1
and the rotating valve disc 29 is mounted on the bushing 2.
8, and the side plate and the adjacent stator 6 have the same diameter, and the outer peripheral surfaces of the side plate 8 and the stator 6 protrude in the axial direction of one of the casing parts 5. 5B, which are surrounded by a common centering web 14 and at least one of the side plate 8 and the valve disc 29 are soldered to each other; 59, of these ring plates, the one facing at least one of the side plate and the valve disc is characterized in that the bearing has a relatively large inner diameter for receiving the bushing 28. Distribution valve for rotating piston machines.