REDUCED HEAT EXCHANGE RECIPROCATING COMPRESSOR

Abstract

A reciprocating compressor with a head-holding turret in the upper portion of which one or more recesses, open to the outside, are defined, which reduce as much as possible the contact surface with the valve carrier plate above.

Claims

1. A reciprocating piston compressor, comprising: a crankcase that houses therein a crankshaft, set in rotation by an engine, the crankcase driving, by means of connecting rods, one or more pistons that slide within respective cylinders, above which is a valve carrier plate in which, for each cylinder, there is defined at least one inlet port, closed by an inlet valve, and at least one exhaust port, also closed by its own exhaust valve, wherein: the upper portion of said crankcase being below said valve carrier plate rises to form a head-holding turret on which said valve carrier plate rests, on the latter being located a head, reversibly connected to the upper portion of said head-holding turret by means of a plurality of clamping screws, in said head being defined a delivery chamber and an intake chamber placed, respectively, in correspondence with said exhaust valve and said inlet valve, and in the upper portion of said head-holding turret, in correspondence with said delivery chamber, one or more recesses are defined below said valve carrier plate.

2. The compressor according to claim 1, wherein said one or more recesses extend horizontally to reduce as much as possible the contact between the upper portion of said head-holding turret and the lower face of said valve carrier plate.

3. The compressor according to claim 2, wherein at least one of said one or more recesses opens to the outside and is directly accessible to the outside air.

4. The compressor according to claim 3, wherein, in the upper portion of said head-holding turret, there is defined a first longitudinal recess that crosses said head-holding turret extending parallel to the axis of rotation of the compressor and the ends of which open onto the two transverse faces of said head-holding turret, respectively.

5. The compressor according to claim 4, wherein one or more transverse recesses are defined in the upper portion of said head-holding turret, each having a first outer end that leads to the longitudinal face of the head-holding turret that is on the side opposite to that of the cylinders and a second inner end that leads to said longitudinal recess.

6. The compressor according to claim 5, wherein at least a portion of the clamping screws engages in respective threaded bushings rising from said head-holding turret.

7. The compressor according to claim 6, wherein said threaded bushings are interspersed with said transverse recesses, while the longitudinal recess separates them from the portion of the head-holding turret in which the cylinders are defined.

8. The compressor according to claim 7, wherein said crankcase is formed from a casting of spheroidal cast iron in which said recesses are already defined.

9. The compressor according to claim 1, wherein at least one of said one or more recesses opens to the outside and is directly accessible to the outside air.

10. The compressor according to claim 9, wherein, in the upper portion of said head-holding turret, there is defined a first longitudinal recess that crosses said head-holding turret extending parallel to the axis of rotation of the compressor and the ends of which open onto the two transverse faces of said head-holding turret, respectively.

11. The compressor according to claim 10, wherein one or more transverse recesses are defined in the upper portion of said head-holding turret, each having a first outer end that leads to the longitudinal face of the head-holding turret that is on the side opposite to that of the cylinders and a second inner end that leads to said longitudinal recess.

12. The compressor according to claim 11, wherein at least a portion of the clamping screws engages in respective threaded bushings rising from said head-holding turret.

13. The compressor according to claim 12, wherein said threaded bushings are interspersed with said transverse recesses, while the longitudinal recess separates them from the portion of the head-holding turret in which the cylinders are defined.

14. The compressor according to claim 13, wherein said crankcase is formed from a casting of spheroidal cast iron in which said recesses are already defined.

15. The compressor according to claim 1, wherein at least a portion of the clamping screws engages in respective threaded bushings rising from said head-holding turret.

16. The compressor according to claim 15, wherein said threaded bushings are interspersed with said transverse recesses, while the longitudinal recess separates them from the portion of the head-holding turret in which the cylinders are defined.

17. The compressor according to claim 16, wherein said crankcase is formed from a casting of spheroidal cast iron in which said recesses are already defined.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 shows a view of the compressor from the motor side.

[0025] FIG. 2 shows a view of the compressor from the nameplate side.

[0026] FIG. 3 shows a first cross section (A-A) of the compressor.

[0027] FIG. 4 shows a second cross section (B-B) of the compressor.

[0028] FIG. 5 shows a perspective view of the compressor crankcase, with an enlargement of the recesses.

[0029] FIG. 6 shows a top view of the compressor crankcase.

DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

[0030] In the embodiment shown in the attached figures, the device that is the subject of the present invention comprises a crankcase (1) in which is housed an electric motor that puts in rotation a crankshaft to which are rotationally connected connecting rods each of which makes a piston slide inside the respective cylinder. It should be noted that the term crankshaft is used to refer to any embodiment typical of crank mechanisms that transform the rotary motion of a shaft into the reciprocating motion of pistons sliding inside cylinders, e.g., an eccentric shaft.

[0031] The upper part of the cylinders is closed by a valve carrier plate (2) above which is the head (7) in which the delivery chamber (3), which receives the high-pressure hot fluid, and the suction chamber (4), which receives the low-pressure cold fluid, are defined.

[0032] At least one inlet port and one exhaust port are defined in the valve carrier plate, which are opened and closed by respective reed valves.

[0033] At one end of the crankcase stands a head-holding turret (5), inside of which the cylinders are defined and above which is the valve carrier plate (2); above the latter is the head (7).

[0034] In the portion of the head-holding turret in which the cylinders are not defined, a longitudinal recess (51) is defined, extending parallel to the axis of rotation of the compressor, the ends of which lead to a respective transverse face of the head-holding turret, and a plurality of transverse recesses (52) are also defined, which have a first inner end that leads to the longitudinal recess (51) and a second outer end that leads to the longitudinal face of the head-holding turret that is on the side opposite to that of the cylinders.

[0035] The head (7) is made integral with the head-holding turret (5) by means of a plurality of clamping screws (71); a portion of the clamping screws engage in respective threaded bushings (53) that rise from the head-holding turret (5) and are interspersed with said transverse recesses (52), while the longitudinal recess (51) separates them from the portion of the head-holding turret (5) in which the cylinders are defined.

[0036] Conveniently, the crankcase (1) is made from a spheroidal cast iron casting molded into a form including a core conformed in such a way as to define said recesses (51, 52) directly in the cast, without the need for further machining with machine tools for chip removal.