US2302747A - Pump or compressor of the liquid ring type - Google Patents

Description

Nov. 24, 1942. R. l.. DARDELET ,2,302,747A

PUMP OR COMPRESSQR ,OF THE LIQUID RING TYPE Filed Deo. 7, 1939n 2 sheets-'sheet 1 1b En: 1 2

@www

Nov. 24, 1942. R 1 DARDELET 2,302,747

' PUMP 0R COMPRESSOR 0F THE LIQUID RING TYPE:

Filed DBC. 7, 1939 zlsheetS-Shee'll- 2 hire/fog Patented Nov. 24, 1942 l Z- f PUMP 0R COMPRESSOR o'F THE LIQUID- RING TYPEk Y Robert Lon Dardelet, Grenoble, France Application December 7, 1939, Serial'No.'308,088l

In France December 17., 1938 s claims. (ci. 23o- 79) My invention relates to rotary gas pumps and compressors of the liquid ring type, which employ a rotor in which are formed a series of displacement chambers from which the liquid alternately enters and recedes during each revolution of said rotor, thereby producing an action of sucking and forcing of any gas through ports provided in a port member or port members, said port member or port members being provided, adjacent said ports, with at least one circular surface co-operating with a circular surface Which'forms part of the rotor in such a manner as to form a joint,

My invention has for its main object a means for making this joint gas-tight at least along the said ports.,

The pump or the compressor according to my invention may be of any appropriate construction and be provided with one or a plurality of port members of any shape and located in any position relatively to the cooperating rotor or rotors, it being possible for example for the distribution to be lateral or internal.

According t0 a preferred embodiment, grooves supplied with liquid and directed in the direction nof the movement of the rotor are provided in the port member on the side of the suction and/or delivery ports provided in same, advantageously in such' a manner as to surround said ports.

Additional grooves may be provided in advance of the delivery ports in the direction of rotation of the rotor, in order to prevent leaks during the compression period which precedes the delivery.

The aforesaid grooves are supplied with liquid in any appropriate manner, for example from a common source of liquid under pressure.

According to a feature of the invention, the liquid is conveyed to the grooves surrounding the suction ports from a low point of the delivery chamber or chambers of the pump, this supply being effected in general at atmospheric pressure in vacuum pumps and at delivery pressure in compressors.

Other objects, features and advantages of my invention will moreover become apparent from th'e ensuing description made -with reference to the accompanying drawings which is given solely by way of example and in which:

Fig. l is a sectional elevation of a pump or compressor according to the invention having a single rotor;

Fig. 2 is a section on a line lI-II of Fig, 1;

Fig. 3 is a development on a larger scale of a portion of the surface of the distributors.

larger scale along the The pump or compressor according to the ernbodiment shown is of the internal distribution type and comprises two stationary port members I and 'I' whereofthe parts facing each other are each provided with an extension, th'e outer surface 3 and 3 of which is circular and cylindrical and the axis of which is at 4.

Each circular surface 3 and 3 lis adapted 'to cooperate with the least possible clearance so as to forma joint with two circular surfaces 6-1 and 6'-'I, the surface B and 6 being formed von the plates '8 and 8 and the surfaces'l and 1 on the hub'of "the rotor 5 keyed to the shaft 9 whereof th'e axis 'is 4 and which is driven in the directionA ofthe arrow f. i

'The rotor 5, which is provided with radial blades 'I I vforming displacement chambers, is enclosed in a stationary body Il) whereof the upper and lower internal Vsurfaces are eccentric relatively to the axis 4.

' The elements which are about to be mentioned are located in the two port members; in order to simplify the explanation, they will only be described `with reference to thevport member I and are referenced, in the drawings on the port member I', with the same reference numeral as on the distributing plate I accompanied by a prime.

The annular rsurface 3l of said port memberl I` is provided with two suction ports I2 and I3 and with two delivery ports I4 and I5 which are'V located betweenthe surfaces 6 and 1, the first opposite the part of the body l0 that moves away from the axis'4 in the direction of the arrow f and the others opposite the lpart of the body I0 that moves towards the axis 4 in th'e same direction. The suction ports I2 and I3 are in communication with the suction chamber I6 which is connected to the suction pipe I'I, Fig. 1, and each delivery port I4 and I5 is in communication with the delivery chamber I8 whichis connected to the delivery pipe I9 (Fig. 1). The pipes II and I9 areeach connected to the two port members land I. n y y It will be understood that the rotation of the rotor 5 inside the body Il! which has previously been filled with liquid compels said liquid, by the action o'f'centrifugal force, to form a ring 2U which assumes the internal shape of the body I0. Said Iring 20, asA known, forms a piston inside each chamber formed between the blades II of the rotor 5 and sucks the gases through the ports I2, I3, I2', I3 and forces them through the ports I4, I5, I4', I5.

Referring toFig. 3, which shows diagrammatically a development of the part of each of the surfaces 3 and 3 which is between the outer ends of the surfaces B and B', these latter being such a manner as to form chambers closed by the Surfaces 6 and l of the rotor, and on the other hand, similar grooves 24, which are likewise paralle] with the arrow f and are arranged along and on the sides of the suction ports l2 and I3 in such a manner as to be covered by the surfaces 6 and 1 of the rotor.

Additional grooves 26, have been shown in the extension and in advance of said grooves 22 in the direction of the arrow f, in order to prevent leaks during the compression period which precedes the delivery.

Identical grooves are provided in the surface 3'.

For supplyingk said grooves with liquid, the grooves 22 have been shown in Fig. 2 as communicating through ducts 28 and 29 with a circular duct 30 connected to an inlet 32 of liquid under pressure. The grooves 24 could be supplied from the same source.

It is to be noted that the pressure of the fluid supplied to grooves 24 may be lower than the pressure of the fluid supplied to grooves 22 and has only to be higher than the inlet pressure of the pump or compressor with the suction ports of which the grooves 24 cooperate. In the embodiment shown, said pressure is substantially equal to the atmospheric pressure in vacuum pumps or to the delivery pressure in compressors, the grooves 24 being in communication, through ducts 34 and 35, with a circular duct 36 which itself communicates with a sump 31 located at the bottom of the delivery chamber I 8, and which at the low point 40 takes up the liquid that is retained therein as it passes after being forced by the liquid ring 20 and before the mixture of gas and liquid is expelled from the pump. (The same occurs in the distributing plate l While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification, without departing from the spirit of the invention. I therefore do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

What I claim is:

1. In a rotary gas pump or compressor of the liquid ring type including a casing, a rotor provided with blades, at least one xed port member coaxial with said rotor and provided with suction and delivery ports, said casing being provided with internal suction and delivery chambers in communication respectively with said suction and delivery ports, a circular surface forming part of said rotor and substantially in contact with said port member in order to form joint therewith, the part of said port member which is in contact with the other of said circular surfaces being provided with grooves arranged on the sides of the suction and delivery ports respectively and directed in the direction of movement of the rotor, passage means extending between a low point of said delivery chamber and the grooves cooperating with the -suction ports for directing liquid to said last named grooves, and means adapted to connect with a source of liquid under pressure the grooves cooperating with the delivery ports.

2. A rotary gas pump or compressor as claimed in claim 1 in which said passage means include a circular duct and a sump between said duct and a low point of the delivery chamber.

3. In a rotary pump or compressor of the liquid ring type, a casing, a rotor mounted therein and having displacement chambers, a least one fixed port member co-axial with the rotor and having inlet and outlet ports in communication with the rotor, a circular continuous surface co-axial with the rotor, on at least one side of said ports and forming part of said port member, a further continuous surface forming part of said rotor and rotating substantially in contact with said rst named circular surface, said surfaces being shaped to form between them at least one sealing chamber along the ports and parallel therewith and elongated in the direction of rotation of the rotor, said sealing chamber being closed and communicating with the outside only across the clearance between said surfaces, and passage means extendincr interiorly of said port member to conduct liquid to said sealing chamber.

4. In a rotary pump or compressor of the liquid ring type, a casing, a rotor mounted therein and having displacement chambers, at least one fixed port member co-axial with the rotor and having inlet and outlet ports in communication with the rotor, two circular continuous surfaces c0- axial with the rotor, on each side of said ports respectively and forming parts of said port member, two circular continuous surfaces forming part of the rotor and rotating substantially in contact with said surfaces respectively in order to form on each side of the said ports a pair of cooperating surfaces, the surfaces forming each pair being shaped to form between them sealing chamber along the ports and parallel therewith and elongated in the direction of rotation of the rotor, said sealing chamber being closed and communicating with each other and with the outside only across the clearance between said surfaces, and passage means extending interiorly of said port member to conduct liquid to said sealing chambers.

5. In a rotary pump or compressor of the liquid ring type, a casing, a rotor mounted therein and having displacement chambers, at least one xed port member co-axial with the rotor and having inlet and outlet ports in communication with the rotor, a circular continuous surface co-axial with the rotor on at least one side of said ports and forming part of said port member, said surface being provided with grooves arranged along the ports and parallel therewith and elongated inthe direction of rotation of the rotor, a further circular surface forming part of the rotor and rotating in contact with said rst named continuous circular surface and closingr the chambers formed by said grooves, said chambers thus only communicating with the outside across the yclearance between said surfaces, and passage means extending interiorly of said port member to conduit liquid to said grooves.

6. A rotary gas pump or compressor as claimed in claim 5 in which said grooves are arranged along said inlet and outlet ports respectively, said passage means including separate means for supplying the grooves cooperating with the inlet ports and the grooves cooperating with the outlet ports.

7. A rotary pump or compressor as claimed in claim 5 in which said grooves are arranged along said outlet ports and in Which said rst named surface is provided with additional grooves in advance of the said last named grooves in the direction of rotation of the rotor.

8. In a rotary pump or compressor of the liquid ring type, a casing, a rotor mounted therein and having displacement chambers, a least one xed port member co-axial With the rotor and having inlet and outlet ports in communication .with the rotor, a circular continuous surface co-axial with the rotor on at least one side of said ports and forming part of said port member, said surface being provided with grooves which parallel the inlet and outlet ports and are elongated in the direction of rotation of the rotor, a further circular surface forming part of the rotor and rotating in contact with said first named continuous circular surface and closing the chambers formed by said grooves, said chambers thus communicating with the outside only across the running clearances between said surfaces, and passage means extending interiorly of said port member to conduct liquid to said grooves.

ROBERT LoN DARDELET.

Images