JP5011297B2 - Pump casing - Google Patents

Description

The present invention relates to a pump casing.
More specifically, the invention relates to the field of pumps that use rotors and are used as compressors for gaseous fluids.
The present invention clearly relates to a pump comprising this casing.

In U.S. Pat. No. 2,460,957, including one of the simplest embodiments, the pump casing consists of two assemblies called a first assembly and a second assembly, These assemblies are joined along a joining surface that is substantially perpendicular to the longitudinal axis of the rotor. In this pump casing, the rotor is guided by a guide element along its longitudinal axis while rotating. These guiding elements are called first guiding elements and are positioned at the height of their opposite ends.
In general, the casing of such a pump casts walls with a metal material and performs machining, particularly drilling machining, on specific surfaces of these walls to define a chamber called a compression chamber, This is achieved by arranging the rotor in

The production of subassemblies by casting a metal material is greatly facilitated when the ratio between the vertical dimension and the lateral dimension (thickness) of each wall defining the subassembly is close to unity.
Although not obligatory, it is preferable to construct two semi-subassemblies in which the longitudinal dimension of the pump casing substantially corresponds to half the longitudinal dimension because of the ease of casting of the metal material.
Furthermore, the precision of the machining can be increased by reducing the vertical dimension of each chamber portion included in the subassembly.
U.S. Pat. No. 2,460,957

However, the situation is complicated when the compression chamber has to be cooled by circulation of the heat transfer medium.
In fact, the pump casing must be provided with a double-walled shell that allows circulation of the heat transfer medium around the compression chamber.
In this type of pump, the double-walled shell provides on the one hand a first wall that determines the volume of the compression chamber and on the other hand a first with a certain distance for circulating the first fluid. A second wall extending around the wall is provided.
With this type of construction, a sealing problem during pumping, caused by different expansions of the first and second walls, is encountered.
One result aimed at by the present invention is to obtain a double-walled pump casing that can overcome the conventional problems encountered both during manufacture and operation of the pump.

For this purpose, the invention has as its subject a pump casing according to claim 1.
Another object of the present invention is a pump equipped with this casing.
The invention will be further understood by reading the following description, given by way of non-limiting example, with reference to the schematically represented drawings.

Referring to the drawings, a pump casing 2 is shown, which allows the circulation of a first fluid 4, in particular a heat transfer medium, at least partially around a chamber 5 that compresses a second fluid 6. A double-walled shell 3. Compression of the second fluid 6 is achieved by means of installing at least two elongated rotors 7, 8 having longitudinal axes 70, 80 in the compression chamber 5.
The first fluid 4 and the second fluid 6 are indicated by arrows.
The rotors 7 and 8 are guided by an element referred to as a first element while rotating around the longitudinal axes 70 and 80 thereof, and the first element is for guiding the rotating unit 9. Are positioned at the heights of the end portions 71, 72, 81, 82 located on opposite sides of each other .
The double-walled shell 3 has on the one hand a first wall 10 that determines the capacity of the compression chamber 5 and on the other hand a second wall 11 extending around the first wall 10, these A specific distance 12 is provided between the walls for the purpose of circulating the first fluid 4.
The pump casing 2 consists of two subassemblies 13, 14, called a first subassembly 13 and a second subassembly 14, which are substantially aligned with the longitudinal axes 70, 80 of the rotors 7, 8. It joins along the orthogonal joining surface 15.

As can be clearly seen from FIG. 1, the two basic subassemblies 13 and 14 of the pump casing 2 and the rotors 7 and 8 enable the formation of the pump 1.
Each of the first assembly 13 and the second assembly 14 is formed of a first heat conductive material, and includes a first surface 18 and a second surface 19 located opposite to the first surface 19. Note that it comprises a rigid element 16 with two faces ,
It is据設the first surface 18,
On the other hand, the first wall 10 cast with this rigid element 16 extends substantially perpendicular to the first face 18, and the first wall 10 further comprises:
A range is defined laterally between two opposing surfaces called third surface 20 and fourth surface 21, third surface 20 defines a lateral range of compression chamber 5, and fourth surface 21 Constitutes an exchange surface with the first fluid 4,
Constrained longitudinally by a fifth surface 22, the fifth surface 22 is at least one receptacle for joining with the fifth surface 22 of the first subassembly 13 or the second subassembly 14. Defining a surface , the first subassembly 13 or the second subassembly 14 must be joined along the joining surface 15 in the form of the pump casing 2;
On the other hand, the second wall 11 extends substantially parallel to the first surface 18 and extends in parallel with the fourth surface 21 of the first wall 10, and at the same time on the fourth wall 21. Is not connected,
Each of the first assembly 13 and the second assembly 14 is further installed in a retracted manner with respect to the first surface 18, and each of the cutout portions 23 is opposed to each of the rotors 7 and 8. It constitutes at least one receiving part for the first element 9 that guides one of the ends 71, 72, 81, 82 while rotating.

By adopting these technical features, the pump casing 2 has an extremely simplified construction, whatever the level this is, i.e. especially when the production comprises a casting step and a machining step. Can be provided.
As will become apparent later, by adopting these features, the pump casing 2 can be provided with a first subassembly 13 and a second subassembly 14 that have a number of common features and are identical. It can be configured to be equipped.

Similarly, it should be noted that the first wall 10 is connected to the rigid element 16 via the connection 24 on at least one of the first subassembly 13 and the second subassembly 14. This induces a displacement of the first wall 10 in a first direction 25 substantially perpendicular to the joining surface or joining plane 15, and this is caused by the elastic deformation of the connection 24.
In a preferred embodiment, the connection 24 is constituted by a banded area of rigid element 16 that delimits the first wall 10.
For example, this strip is composed of a thinned portion of rigid element 16.
Advantageously, this thinned strip region extends on the first plane 26 substantially parallel to the bonding surface or bonding plane 15.
By adopting these features, the extension or shortening of the first wall 10 can be absorbed by the elastic deformation of the connecting portion 24.

Each of the cutout portions 23 provided in a shape retreated with respect to the first surface 18 is further provided with each of the opposed end portions 71, 72, 81, 82 of the elongated rotors 7, 8 and the target cutout portion 23. An accommodation portion for accommodating the second element 27 is configured to secure the tightness between the rigid element 16 to be installed.
The second element 27 ensures a tension called “dynamic”, ie an effective tension during the rotation of the rotor.
As is apparent from the drawing, each cut-out portion 23 has an inner diameter, which is the first element of the first element for guiding the rotating portion 9 of the end portions 71, 72, 81, 82 of the rotors 7, 8. One tensioning area 231 and further ensuring tension between the ends 71, 72, 81, 82 of the rotors 7, 8 and the rigid element 16 at the height at which these ends are installed. And a second bearing area 232 for the second element 27 for the purpose.
Although not shown in the figure, the rotors 7 and 8 are rotationally driven, and the rotations of the differently driven rotors 7 and 8 are synchronized.

As is apparent from FIG. 2, one of the constituent subassemblies 13, 14 of the pump casing 2 is connected to the housing 17 and the cover 28.
Although not shown in the drawing, the housing 17 or the cover 28 covers a mechanism for synchronously driving different rotors 7 and 8 accommodated in the pump casing 2.

In order to be able to drive the rotors 7, 8, at least one of the first subassembly 13 and the second subassembly is provided with an inner diameter that passes straight through the rigid element provided on it, The end of the rotor crosses the inner diameter in a manner that extends beyond the second face of the rigid element of interest.
Means for synchronously driving the rotors 7, 8 can be connected to the end passing through the inner diameter in a manner extending beyond the second face of the rigid element of interest.
The first subassembly 13 and the second subassembly 14 are provided with an inner diameter that passes straight through the rigid element 16 provided thereto, and the first subassembly 13 and the second subassembly 14. The second surface 19 of the rigid element 16 is preferably provided with at least one cover 28 that tightly closes the inner diameter.

The first subassembly 13 and the second subassembly 14 constituting the pump casing 2 are joined by a third element 29, and the third element 29 is connected to the first subassembly 13 and the second subassembly 13. Preferably, one of the subassemblies is pulled toward the other in such a way that the fifth surface 22 of each rigid element 16 of the subassembly is firmly attached with one against the other.
By adopting these technical features, the coupling of the assembly of the first subassembly 13 and the second subassembly 14 is ensured.

In a preferred embodiment, the first subassembly 13 and the second subassembly 14 constituting the pump casing 2 are joined by a third element 29 consisting of a tension rod, the third element 29 being
Each extending in a second direction 30 substantially perpendicular to the joining surface 15, and at least certain of the third elements of the first subassembly 13 and the second subassembly 14 Pass through the space between each first wall 10 and second wall 11,
Find the support at the height of the second face 19 of each rigid element 16 comprising one of the first subassembly 13 and the second subassembly 14;
The expression “at the height of the second surface 19” should not be construed as ensuring that the third element 29 exactly finds the support in the plane of the second surface 19.

For example, the third element 29 is secured in the rigid element 16 and finds a support on a receiving surface (not shown) that is set back with respect to the second surface 19.
By adopting these technical features, a joining stress in the second direction 30 in contact with the first wall 10 is applied to the solid strip-like area of the subassembly, and the first subassembly 13 and the first Adhesion of the joining of the second subassembly 14 is ensured.

The following should be noted.
The first subassembly 13 and the second subassembly 14 constituting the pump casing 2 are joined by a third element 29, which comprises the first subassembly 13, the second subassembly 13, and the second subassembly 14; Pulling one of the subassemblies toward the other in such a way that the fifth surface 22 of each rigid element 16 of the subassembly is firmly attached with one against the other;
The second wall 11 of each of the first subassembly 13 and the second subassembly 14 extends beyond the first surface 18 and comprises a surface referred to as a sixth surface 31, the same first Extending to a second plane 32 parallel to the fifth surface 22 of the subassembly 13 or the second subassembly 14, from this fifth surface 22, the first subassembly 13 and the second subassembly 13. The fifth surfaces 22 of the subassemblies 14 are retracted so that they are in contact with each other, and the sixth surfaces 31 of these subassemblies 13 and 14 are predetermined so that a gap 33 remains between them. They are separated by the value “E”.

By adopting these technical features, a complete equilibrium of the assembly is ensured.
The sixth surfaces are preferably separated by a value “E” between several hundred millimeters and tens of millimeters.
If it is within the limit of the separation value of the sixth surface 31 (thermal expansion), even if the second wall 11 provided with the sixth surface 31 is extended, the sixth surface 31 and the fifth surface 22 are extended. This will not affect the installation.

In addition, the following should be noted.
At least one first gasket in which at least one of the fifth surfaces 22 of the first subassembly 13 and the second subassembly 14 located in contact with each other cooperates with the other fifth surface 22. By providing 35, the sealing performance of the outer edge of the compression chamber 5 is ensured at the height of the two fifth surfaces 22 located in contact with each other,
At least one of the sixth surfaces 31 of the first subassembly 13 and the second subassembly 14 is installed facing each other via at least one second gasket 36, and is located in contact with each other. The second gasket 36 seals the outer edge of the space between the first wall 10 and the second wall 11 while providing a gap 33 having a predetermined value “E” remaining between the sixth surfaces 31. .

For example, at least one of the fifth surfaces 22 of the first subassembly 13 and the second subassembly 14 has a groove 34 that receives a first gasket 35 that cooperates with the other fifth surface 22. Prepare. Another technical solution can be used to accommodate the first gasket, which is not described here because it belongs to the state of the art.
The expressions “at least a first gasket 35” and “at least a second gasket 36” use one sealing element and / or the operation of each sealing element is joined by a coating. It means that it can be supplemented or reinforced by using a sealing material.

By the first gasket 35 and the second gasket 36, static sealing performance, that is, sealing performance between the fifth surfaces immovable with respect to each other or between the sixth surfaces immovable with respect to each other . Is secured.
In the drawing, the first gasket and the second gasket are provided with an annular type gasket, but it is not always necessary to be of this type, as long as each of the gaskets can be achieved.
The first gasket 35 and the second gasket 36 may be flat gaskets, and may be formed of a series of materials disposed on the surfaces to be joined.
By adopting these technical features, a complete seal of the compression chamber 5 and a space 4 through which the first fluid circulates can be ensured.
The bearing range used for joining is composed of two first subassemblies to be joined and a fifth surface 22 of the second subassembly, and this range includes the first subassembly and the second subassembly. A lateral positioning auxiliary element, a male part 37 and a female part 38 are provided for positioning the sub-assembly in the lateral direction.

In an advantageous embodiment, the fifth surface 22 is flat and the auxiliary positioning element comprises a pin 37, which is for the joint made on each receiving surface constituted by the fifth surface 22. Engage within the inner diameter 38.
By adopting these technical features, the first subassembly 13 and the second subassembly 14 can be precisely positioned relative to each other.
If the pump casing 2 is intended to receive at least two elongate rotors 7,8 with longitudinal axes 70,80 installed in the same third plane, the first subassembly The receiving surfaces for joining created by the fifth surface 22 of each of the 13 and second subassemblies 14 are installed in a third plane 39 and are two lateral positioning auxiliary elements The male part 37 and the female part 38 are provided.
In this way, the positioning of the two subassemblies 13 and 14 of the pump casing 2 is not affected by fine displacements caused by successive heating and cooling cycles performed by the pump.

As a whole, the first subassembly 13 and the second subassembly 14 provided in the pump casing 2 are composed of the first subassembly 13 and the second subassembly in which the joining surfaces 15 are assembled and face each other. The first surface 18 of the assembly is configured to be installed between ¼ and ¾ of the distance separating the first surfaces 18.
Preferably, the first subassembly 13 and the second subassembly 14 included in the pump casing 2 are the first subassembly 13 and the second subassembly in which the joining surfaces 15 are assembled and face each other. The first surfaces 18 are configured to be installed approximately in the middle of the distance separating the first surfaces 18.
By adopting these last technical features, for example, the pump casing 2 can be formed by the same first subassembly 13 and second subassembly 14.

In any case, the adoption of these last technical features simplifies the machining of the compression chamber 5 while rotating the ends 71, 72, 81, 82 of the elongated rotors 7, 8 on the one hand. Sealing between the first receiving surface 231 intended to receive the first element 9 to be guided while on the other hand the rotor ends 71, 72, 81, 82 and the rigid element 16 The machining of the inner diameter constituting the second receiving surface 232 for the purpose of receiving the second element 27 in a state in which is secured is simplified.

  If the pump casing 2 has at least one first channel 40 that allows a third fluid 41, called dilution fluid, to be injected into the chamber and discharged from the compression chamber, at least this first One channel 40 delivers a third fluid 41 introduced from an inlet installed in the rigid element 16 and is compressed from at least one outlet orifice 42 installed at the height of the third face 20. It is intended to be discharged into the chamber 5 and is made to have a thickness of the first wall 10.

The third fluid 41 is indicated by an arrow emanating from the exit orifice 42.
By adopting these technical features, the third fluid 41 can be sent to any suitable location in the compression chamber 5.
In the first embodiment, the second wall 11 of the first subassembly 13 and the second subassembly 14 is formed by the same casting.
According to the second embodiment, each second wall 11 of the first subassembly 13 and the second subassembly 14 is the same as the first material constituting the first wall 10. The two materials are formed by casting the same material.
According to the third embodiment, the respective second walls 11 of the first subassembly 13 and the second subassembly 14 are different from the first material constituting the first wall 10. It is formed by casting the second material.
By adopting these technical features, the production of the pump casing 2 can be greatly simplified.

  Two elongate tubes arranged in parallel in the compression chamber 5 provided in the pump casing 2 with a first orifice 44 through which the second fluid 6 flows and a second orifice 45 through which the second fluid 6 is discharged. When the rotors 7 and 8 are accommodated, the respective rigid elements 16 of the first subassembly 13 and the second subassembly 14 open to the first surface 18 through the openings. A second channel 46 constituting one of the first orifice 44 or the second orifice 45 and a plane of symmetry 47 is provided. This symmetrical plane 47 is on the one hand installed in the middle of the longitudinal axes 70, 80 of the elongated rotors 7, 8 and on the other hand perpendicular to the third plane 39 including the longitudinal axes 70, 80 of the rotors 7, 8. is there.

The second channel 46 is determined by a plurality of transverse sections, each provided with a plane of symmetry 47, which is installed on the one hand in the middle of the longitudinal axes 70, 80 of the elongated rotors 7, 8, on the other hand the rotor. It is perpendicular to the third plane 39, which includes the 7 and 8 longitudinal axes 70 and 80.
By adopting these technical features, a symmetrical temperature distribution can be secured in each of the first subassembly and the second subassembly, and in particular, the first subassembly and the second subassembly. The same temperature distribution can be secured at the height of the first element that is housed in the product and is guided while rotating.

In effect, the amount of heat that the hot fluid removed from the compression chamber 5 has on both sides of the symmetry plane 47 is the same.
Each of the first subassembly 13 and the second subassembly 14 comprises a plane of symmetry 47 which, on the one hand, is installed in the middle between the longitudinal axes 70, 80 of the elongated rotors 7, 8. On the other hand, it is perpendicular to the third plane 39 including the longitudinal axes 70, 80 of the rotors 7, 8.
By adopting these technical features, the uniformity of the temperature distribution is enhanced.

In an advantageous manner, at least, a second orifice 45 for discharging the second fluid 6 are formed in the lower portion of the compression chamber 5, in the sub-assembly providing the outlet, any condensate Ru Oh ( The condensate can be removed by gravity (not shown).

It is a perspective developed view of the pump casing according to the present invention. FIG. 2 is a pump including the pump casing of FIG. 1, which is viewed in a section along a plane passing through a longitudinal axis of a rotor provided in the pump casing. 1 is an end view of one subassembly comprising a pump casing according to the present invention. FIG. FIG. 4 is a cross-sectional view of the subassembly according to FIG. 3, which is a view along an intermediate plane. The details of the joining of the two subassemblies of the pump casing are shown in a partially enlarged sectional view.

Claims (17)

Pump having a double-walled shell (3) allowing circulation of the first fluid (4), in particular a heat transfer medium, at least partly around the chamber (5) for compressing the second fluid (6) A casing (2), wherein the compression is achieved by at least two elongated rotors (7, 8) having a longitudinal axis (70, 80) and installed in the compression chamber (5);
The rotor (7, 8) is guided by an element rotating around its longitudinal axis (70, 80), said element being referred to as a first element (9) guiding while rotating, said first element (9) is positioned at the height of the ends (71, 72, 81, 82) located on opposite sides of the rotor,
The double-walled shell (3) has on the one hand a first wall (10) that determines the volume of the compression chamber (5), and on the other hand around the first wall (10) the first wall (10). A second wall (11) extending at a specific interval (12) for circulating one fluid (4),
The pump casing (2) is made up of two subassemblies (13, 14), called first subassembly (13) and second subassembly (14), which are said rotor (7 8) of the first sub-assembly (13) and second sub-assembly (14) of the first sub-assembly (13) and the second sub-assembly (14). Each is rigid with a first surface (18) and a second surface (19) opposite the first surface (18) cast from a first heat transfer material. Comprising an element (16),
Installed on the first surface (18), on the one hand, the first wall cast with this rigid element (16) extends substantially perpendicular to the first surface (18);
A lateral extent is defined between two opposite faces, called third face (20) and fourth face (21), said third face (20) transverses the compression chamber (5). Demarcating in direction, the fourth surface (21) constitutes an exchange surface with the first fluid (4);
The fifth surface (22) defines at least one receiving surface for joining with the fifth surface (22) of the first subassembly (13) or the second subassembly (14). 1 wall (10) is restricted in the longitudinal direction and should be joined along the joining surface (15) in the form of a pump casing (2) by said fifth surface (22);
On the other hand, the second wall (11) is substantially perpendicular to the first surface (18) and without any contact with the fourth surface (21) of the first wall (10). Parallel,
Retracted from the first surface (18) and installed, the cutout (23) is one of the opposing ends (71, 72, 81, 82) of the rotor (7, 8). Each comprising at least one housing for a first element (9) that guides one while rotating;
The first subassembly (13) and the second subassembly (14) constituting the pump casing (2) are joined by a third element (29), and the third element (29) Is a form in which one of the fifth surfaces (22) of the respective rigid elements (16) of the first subassembly (13) and the second subassembly (14) is brought into contact with the other and firmly adhered thereto. And pulling one of the first and second subassemblies toward the other,
The third element (29) comprises a tension rod, the first subassembly (13) and the second subassembly (14) are joined by the tension rod;
The third element (29) composed of the tension rod is:
Each of the third elements (29) extends in a second direction (30) substantially perpendicular to the joining surface (15), wherein at least a particular one of the third elements (29) is the first subassembly (13). And a space between the first wall (10) and the second wall (11) of each of the second subassemblies (14),
A pump casing (2) finding a support at the height of the second face (19) of each rigid element (16) comprising one of the first and second subassemblies (13, 14). Pump casing (2) according to claim 1,
On at least one of the first and second subassemblies (13, 14), a first wall (10) is connected to the rigid element (16) by a connection (24), The connecting portion (24) induces a displacement of the first wall (10) in a first direction (25) substantially perpendicular to the joining surface (15), which is also the connecting portion. Pump casing (2) induced by elastic deformation of (24). Pump casing (2) according to claim 1 or 2,
Each of the cutouts (23) installed backward by being set with respect to the first surface (18) has end portions (71, 72, 81, 82) located on opposite sides of the elongated rotor (7, 8). ) And the rigid element (16) on which the target cutout part (23) is installed constitutes a housing part for the second element (27) for ensuring the sealing performance Pump casing (2). In the pump casing (2) according to any of claims 1-3,
The first subassembly (13) and the second subassembly (14) constituting the pump casing (2) are joined by a third element (29), and the third element (29 ) In such a manner that the fifth surface (22) of each rigid element (16) of the first and second subassemblies (13, 14) is firmly attached with one against the other. Pull one of the first and second subassemblies (13, 14) towards the other,
The second wall (11) of the first subassembly (13) and the second subassembly (14) extends in a direction intersecting the first surface (18), and a sixth wall A sixth surface (31) that is parallel to the fifth surface (22) of the first or second subassembly (13, 14). Although extending in the plane (32), the fifth surface (22) of the first assembly (13) and the second assembly (14) is located in contact with each other. The sixth surface (31) of the first and second subassemblies (13, 14) is retracted with respect to the fifth surface (22) so that a gap (33) remains between them. , are spaced at a predetermined value "E",
At least one of the first subassembly (13) and the fifth subassembly (22) facing each other is provided with at least one first gasket (35), Gasket (35) cooperates with the other fifth surface (22) and seals the outer edge of the compression chamber (5) at the height of the two fifth surfaces (22) located opposite each other. Secure
At least one of the sixth surface (31) of the first subassembly (13) and the second subassembly (14) has a predetermined value “E” between the sixth surfaces (31). At least one second gasket (36) that ensures hermetic sealing of the outer edge between the first wall (10) and the second wall (11) while leaving a gap (33). A pump casing (2) installed opposite to each other . In the pump casing (2) according to any one of claims 1 to 4 ,
The receiving surface for the joining constituted by the fifth face (22) of the two first and second subassemblies (13, 14) to be joined is the two first and second A pump casing (2) having auxiliary elements for lateral positioning, a male part (37) and a female part (38) in such a way that each of the subassemblies can be positioned laterally. 5. An object according to any of claims 1 to 4 , and for accommodating at least two elongated rotors (7, 8) whose longitudinal axes (70, 80) are positioned in the same plane (39). In the pump casing (2)
The receiving surface joined by the fifth surface (22) of the first or second subassembly (13, 14) is two auxiliary elements that perform lateral positioning, and the third A pump casing (2) having a male part (37) and a female part (38) installed in a flat surface (39). In the pump casing (2) according to any one of claims 1 to 6 ,
The first and second subassemblies (13, 14) provided in the pump casing have the joining surfaces (15) opposed to the joined first and second subassemblies (13, 14). A pump casing (2) constructed so as to be installed at a position between 1/4 and 3/4 of the distance separating the first surfaces (18). In the pump casing (2) according to any one of claims 1 to 7 ,
The first and second subassemblies (13, 14) provided in the pump casing have the joining surfaces (15) opposed to the joined first and second subassemblies (13, 14). 14) A pump casing (2) constructed so as to be positioned substantially in the middle of the distance separating the first surfaces (18) of 14). A pump having at least one first channel (40) for introducing and evacuating a third fluid (41), referred to as a dilution fluid, in any one of claims 1 to 8 , into the chamber. In the casing (2),
In the pump casing (2), at least the first channel (40) sends the third fluid (41) introduced from the inlet installed in the rigid element (16), and the third casing (3) A pump which is discharged into the compression chamber (5) via at least one outlet orifice (42) installed at the level of the surface and is made to the thickness of the first wall (10) Casing (2). Pump casing (2) according to any of claims 1 to 9 ,
The pump casing (2), wherein the second wall (11) of each of the first and second subassemblies (13, 14) is formed by casting. Pump casing (2) according to any of claims 1 to 9 ,
The second wall (11) of each of the first and second subassemblies (13, 14) is the same second material as the first material constituting the first wall (10). Pump casing (2) formed by casting the same material. Pump casing (2) according to any of claims 1 to 9 ,
The second wall (11) of each of the first and second subassemblies (13, 14) is a second different from the first material constituting the first wall (10). Pump casing (2) formed by casting the same material. Is according to any one of claims 1 to 12, wherein the compression chamber (5) intended to receive two elongated rotors arranged in parallel (7, 8) into said compression chamber (5) is the In a pump casing (2) comprising a first orifice (44) through which a second fluid (6) flows and a second orifice (45) through which the second fluid (6) is discharged,
The rigid element (16) of each of the first and second subassemblies (13, 14) comprises a second channel (46), and the second channel (46) is the first channel (46). An opening is formed in the first surface (18) through an opening constituting one of the orifice (44) and the second orifice (45), and a symmetry plane (47) is provided. The symmetry plane (47) On the one hand, the elongated rotor (7, 8) is installed in the middle between the longitudinal axes (70, 80), and on the other hand, the longitudinal axis (70, 80) of the rotor (7, 8) is provided. Pump casing (2) perpendicular to the three planes (39). Pump casing (2) according to claim 13 ,
Said second channel (46) is delimited by transverse sections each having a plane of symmetry (47), said plane of symmetry (47) on the one hand being the longitudinal axis (70) of said elongated rotor (7, 8). , 80), the pump casing (2) being perpendicular to the third plane (39) providing the longitudinal axis (70, 80) of the rotor (7, 8) on the other hand . Pump casing (2) according to any of claims 1 to 14 ,
Each of the first and second subassemblies (13, 14) provided in the pump casing comprises a plane of symmetry (47), the plane of symmetry (47), on the one hand, of the elongated rotor (7, 8). A pump installed in the middle between the longitudinal axes (70, 80) and on the other hand perpendicular to the third plane (39) providing the longitudinal axis (70, 80) of the rotor (7, 8) Casing (2). Pump casing (2) according to any of claims 1 to 15 ,
A second orifice (45) for draining the second fluid (6) is formed in the lower part of the compression chamber (5) and is in the subassembly providing the second orifice (45). Pump casing (2) that removes the condensate by gravity of any condensate. Pump comprising a pump casing according to any of claims 1-16.

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