WO2011137474A2 - Discharge silencer for a hermetically encapsulated refrigerant compressor - Google Patents

Abstract

The invention relates to a discharge silencer (6) for a hermetically encapsulated refrigerant compressor (1), which comprises a piston/cylinder unit (4) that compresses a refrigerant and has a compression chamber (3) and which is enclosed by a hermetically sealed compressor housing (2), wherein the compression chamber (3) is supplied with refrigerant coming from an evaporator through a suction silencer (5) and discharges refrigerant compressed by the piston/cylinder unit (4) into a pressure line (7a, b) through the discharge silencer (6). According to the invention, the discharge silencer (6) comprises a main body (8), on which an inlet flange (9) for the refrigerant coming from the piston/cylinder unit (4) is arranged, and an outlet channel (10), through which the refrigerant can be led into a pressure line (7a, b) that supplies a condenser with compressed refrigerant. The main body (8) has four side walls (11, 12, 13, 14), which each have a longitudinal extension and a width extension that is shorter than the longitudinal extension, wherein the two side walls (11, 12) having larger areas are opposite each other and are curved in the same direction when viewed in a direction parallel to the longitudinal extension.

Description

 Pressure silencer for a hermetically sealed

 Refrigerant compressor

FIELD OF THE INVENTION

The present invention relates to a muffler for a hermetic-type refrigerant compressor comprising a refrigerant-compressing and a compression space having piston-cylinder unit and is surrounded by a hermetically sealed compressor housing, wherein the compression chamber via a suction muffler coming from an evaporator refrigerant is supplied and over the

Pressure silencer via the piston-cylinder unit delivers compressed refrigerant into a pressure line.

STATE OF THE ART

The use of such pressure silencer in the

Refrigerant compressor technology is well known and serves the reduction of occurring in the discontinuous compression of refrigerant noise emissions of the

Refrigerant compressor. Both metallic pressure silencers and non-metallic variants are known. Depending on the arrangement and design of the pressure silencer, different frequency ranges can be damped.

Pressure mufflers are characterized by the fact that in the volume of a body, a chamber system is formed, which must be flowed through by the compressed refrigerant relatively shortly after its compression, on the one hand the on the other hand, but also to be able to withhold the heat losses of the hot refrigerant after the compression process in opposite the pressure line large areas having pressure muffler. The design of the chamber system depends primarily on the frequency range to be damped but also on thermal aspects.

The requirement to install the muffler as close as possible to the exhaust valve of the piston-cylinder unit to achieve optimum damping and minimum heat losses is often associated with space problems in practice and has often caused mufflers to interfere with the cylinder head of the pistons Cylinder unit is arranged projecting into the interior of the compressor housing, which, inter alia, has an effect on the size of the compressor housing, which appears unnaturally bulged at this point.

In the course of increasing resource efficiency and the associated reduction of refrigerant compressors and their hermetically sealed compressor housings, it is desirable to accommodate the pressure muffler space-saving as possible in the compressor housing. PRESENTATION OF THE INVENTION

 It is therefore the object of the present invention to provide a pressure muffler for a hermetically sealed

Provide refrigerant compressor, which occupies as little space in the interior of the compressor housing.

According to the invention this is achieved in a pressure muffler of the type mentioned above in that the pressure muffler has a base body, on which an inlet flange for the coming of the piston-cylinder unit refrigerant is arranged and an output channel, via which the refrigerant can be transferred into a pressure line supplying a condenser with compressed refrigerant and which base body has four side walls, each having a longitudinal extension and a comparatively shorter width extension, wherein the two larger side walls face each other and viewed in a direction parallel to the longitudinal direction each are executed curved in the same direction.

The fact that the pressure muffler has two sidewalls curved in the same direction in each case makes it possible to arrange it around a corner / edge or bend of the piston-cylinder unit and / or of components of the electric motor. The pressure muffler can due to the two curvatures according to the invention with one side wall on the one hand closely to the piston-cylinder unit and the electric motor nestle with the other side wall but also closely to the inner wall of the compressor housing, in order as a result, the compressor housing as tight as possible to grow on the piston-cylinder unit and minimize the void inside the compressor housing can.

According to a particularly preferred embodiment of the invention, it is provided that the curvature of the one surface-larger side wall is continuous, preferably following the shape of a circular arc. Such an embodiment allows an ideal adaptation of the pressure silencer to the usually cylindrical or dome-shaped wall of the compressor housing.

According to a further preferred embodiment of the invention, it is provided that the curvature of the other surface-larger side wall is discontinuous, in the form of at least two, arranged at an angle to each other partial surfaces. The side wall of the pressure muffler can thus particularly space-saving to an edge or bend of the Electric motor (and / or components thereof) and / or the piston-cylinder unit are nestled.

To achieve high sound damping properties with a compact design of the pressure silencer, it is provided according to a further preferred embodiment that the volume of the body is divided by several, the two side walls connecting partitions in different chambers.

Claim 5 refers to a hermetically sealed refrigerant compressor, with a refrigerant-compressing and a compression chamber having, driven by an electric motor piston-cylinder unit and a surrounding, hermetically sealed

Compressor housing, wherein the compression chamber is supplied via a suction muffler with coming from an evaporator refrigerant and emits compressed refrigerant via the pressure muffler by means of the piston-cylinder unit in a pressure line. While achieving the advantages already described in the introduction, it is provided according to the invention that the pressure silencer surrounds an edge or bend of the electric motor or a part thereof and / or the piston-cylinder unit in the direction of the edge or bend.

In a particularly space-economical embodiment variant of the invention, the edge or bend is an edge of the stator lamination stack of the electric motor.

In accordance with the invention, the pressure silencer comprises a main body to which an inlet flange for the refrigerant coming from the piston-cylinder unit is arranged and an outlet channel, via which the refrigerant can be transferred into a pressure line supplying a condenser with compressed refrigerant and which main body has four side walls, of which the two in terms of area larger, opposite side walls are each curved in the same direction.

According to a preferred embodiment variant, the curvature of the one surface-larger side wall is continuous, preferably following the shape of a circular arc.

According to a further preferred embodiment, the curvature of the other surface-larger side wall is discontinuous, ie. approximated, in the form of at least two, at an angle to each other arranged partial surfaces.

The pressure silencer is advantageously attached to the piston-cylinder unit in such a way that the edge region formed between the at least two partial surfaces extends immediately in front of and substantially parallel to the edge or bend of the electric motor and / or the piston-cylinder unit. In this way, a particularly space-saving arrangement of the pressure muffler is made possible within the compressor housing.

The space utilization within the compressor housing is further optimized by it is provided according to a further preferred embodiment of the invention, seen in a line of sight along the axis of the crankshaft of the electric motor, the curvature of one of the larger area side walls at least partially the curvature of the compressor housing in the region Arrangement of the pressure silencer within the compressor housing corresponds.

BRIEF DESCRIPTION OF THE FIGURES

Following is now a brief description of the invention with reference to figures of an embodiment. Showing: Fig.l is a schematic overall view of a hermetically sealed refrigerant compressor with inventive pressure silencer (top view)

2 shows a side view of the refrigerant compressor

 Fig.l with partially cut compressor housing

3 shows an axonometric oblique view of a pressure silencer according to the invention

 4 shows a bottom view of an inventive

 discharge silencer

Fig. 5 is a sectional view of the invention

 pressure silencer

 6 shows a further axonometric oblique view of the pressure silencer according to the invention

 7 shows a sectional view along line AA of Figure 8

8 is a side view of a hermetically sealed

 Refrigerant compressor without upper part of the

compressor housing

3 shows an axonometric oblique view of a pressure muffler 6 according to the invention to be installed in a refrigerant compressor 1 with a main body 8 and an inlet flange 9 for a refrigerant coming from the piston-cylinder unit 4 (see FIG. The main body 8 has an elongated basic shape and has four side walls 11,12,13,14, each having a longitudinal extent 33 and a comparatively shorter width extension, which side walls in a lower end portion of a substantially flat and orthogonal to the side walls eleventh , 12,13,14 extending bottom portion 28, which may be formed as a separate component, be limited or pass into these. In an upper end region, the side walls 11, 12, 13, 14 run out into the inlet flange 9. As in Fig.3 and 6, in this case a cap-shaped ceiling section 29 is formed in the transition region between the side walls 11, 12, 13 and the inlet flange 9.

The hermetically sealed refrigerant compressor 1, in Fig.l and Figure 2 seen in which the pressure silencer 6 according to the invention is installed, is surrounded by a hermetically sealing compressor housing 2, the upper part in Fig.l is not shown, wherein within the compressor housing 2 a is arranged by an electric motor 25 with a rotor 42 driven piston-cylinder unit 4. The piston-cylinder unit 4 ^' comprises an oscillating in a cylinder housing 4b piston 4a, which compresses a refrigerant in a compression chamber 3 in a known manner and transported in the direction of the pressure silencer 6 according to the invention. Also visible in Fig.l are a rotatable about an axis 27 crankshaft 26 with an eccentric to the axis 27 arranged crankshaft journal 26a, on which a piston 4a driving connecting rod 30 is articulated.

The compressed in the compression chamber 3 refrigerant is sucked from the compressor housing, where it passes through a coming from a cooling chamber heat extracting evaporator suction line 34, previously sucked by the piston 4a via a suction muffler 5.

In the bottom portion 28 of the pressure muffler 6, an outlet channel 10 is provided, via which the refrigerant in a condenser with a compressed refrigerant supplying pressure line 7a, b can be transferred.

As can also be seen in FIG. 4, which shows a view in the direction of the longitudinal extension 33 of the pressure muffler 6, it is provided according to the invention that of the four side walls 11, 12, 13, 14 of the main body 8, the two larger side walls 11 and 12 , each other are opposite and are each curved in the same direction.

 In this way, it is possible that the pressure silencer 6 surrounds an edge or bend 23 of the electric motor 25 or of parts thereof and / or the piston-cylinder unit 4 enclosing (see in particular Figure 7). In the present exemplary embodiment, the edge or bend 23 enveloped by the pressure muffler 6 is an edge or bend 23 of a stator lamination stack 24 of the electric motor 25. For the sake of clarity, reference will be made below to the specific exemplary embodiment. However, it will be clear to those skilled in the art that the present invention relates generally to a pressure muffler which may additionally or entirely alternatively surround parts of the piston-cylinder unit.

 Surrounded by enclosing it is inventively meant that the left and right of the edge or bend 23 extending portions of the muffler 6 in a line of sight along the edge or bend 23 as close to the electric motor 25 or parts thereof and / or on the piston-cylinder Unit 4 or alternatively that those of the edge or bend 23 facing side surface 12 of the muffler 6, the negative counterpart to the contour of the electric motor 25 or parts thereof and / or the piston-cylinder unit 4 in the region of the edge or bend 23 form.

7 shows the edge or bend 23 of the laminated stator core 24 in detail. For the sake of clarity, in FIG. 7, as can be seen from FIG. 8, the cylinder housing 4b and parts of the electric motor 25 have been cut away. The left and right of the edge or bend 23 extending contour edges 41 of the laminated stator core 24 or more precisely the individual superimposed stator blades can thereby again have any shape, so be either straight running as shown in Fig. 7 left (solid) and right (dashed) the edge or bend 23 is shown or unevenly curved, as in Fig.7 right edge or bend 23rd shown by solid lines, as required.

 As can be seen in FIG. 1, the curvature of the side wall 11 facing away from the electric motor 25 or the piston-cylinder unit 4 is continuous, preferably following the shape of a circular arc.

On the other hand, the side wall 12 facing the side wall 11 and facing the electric motor 25 or the piston-cylinder unit 4 can be unsteady, for example as shown in the form of at least two partial surfaces 12a, 12b approaching a continuous curvature and arranged at an angle to one another. In other words, the side wall 12 has at least one bend or edge region 15 which divides the side wall 12 into at least two partial surfaces 12a, 12b.

The angle drawn in FIG. 4 between the outer surfaces of the partial surfaces 12a, 12b (facing the electric motor 25 or the piston-cylinder unit 4) is less than 180 ° and preferably greater than 90 °. In the present embodiment, the angle between the partial surfaces 12a and 12b of the side wall 12 is approximately 150 °.

 The pressure silencer 6 is in the present

Embodiment attached to the piston-cylinder unit 4, that between the at least two partial surfaces 12a, 12b formed edge portion 15 immediately before the edge or bend 23 of the electric motor 25 and the piston-cylinder unit 4 extends.

Furthermore, it can be provided that in a viewing direction along the axis 27 of the crankshaft 26 of the Electric motor 25 seen, the curvature of the side wall 11 at least partially corresponds to the curvature of the compressor housing 2 in the region of the arrangement of the pressure silencer 6 within the compressor housing 2. As can be seen in Figure 3, has the opening of the inlet flange 9 of the invention

Pressure silencer 6 has a substantially kidney-shaped cross section, which in the mounting position to the apparent in Fig.l cylinder housing 4b of the piston-cylinder unit 4, more precisely, to a compression chamber 3 of the cylinder housing 4b delimiting valve plate 35 connects, wherein the opening cross-section of the inlet flange. 9 one or more in the valve plate 35 existing pressure openings sealingly encloses. In a preferred embodiment, the inlet flange 9 of the suction muffler 6 is fastened by means of one or more fasteners 38 on the cylinder housing 4b, wherein the at least one fastening element 38 presses the inlet flange 9 in the axial direction of the piston bore to the cylinder housing 4b. Such an arrangement is disclosed in connection with the attachment of a cylinder head already in EP 1888918 Bl.

 In the embodiment according to Fig.l is the

Fastener 38 designed as a clamping element, which with e.g. three Schenkeiförmigen end portions 38a latched to corresponding undercuts 40 on the outer surface of the cylinder housing 4b (see Figure 2).

In a preferred embodiment of the invention, the main body 8 of the pressure silencer 6 according to the invention extends from an area adjacent to the valve plate 35 in the direction of the electric motor 25 or in the direction of a bottom region 39 of the compressor housing 2 Pressure silencer 6 is thus, viewed in an operating position of the refrigerant compressor 1, arranged below the piston-cylinder unit 4.

As can be seen in a sectional illustration according to FIG. 5, the volume of the main body 8 of the pressure muffler 6 is divided into several (in the present exemplary embodiment: five) chambers 19, 20 by a plurality of partitions 16, 17, 18, 19 connecting the two side walls 11, 12 , 21, 22, 36 shared. The indicated in Figure 5 with arrows 31a-c refrigerant flows through all the chambers 19, 20, 21, 22, 36, before it is transferred via the outlet channel 10 from the pressure silencer 6 in the pressure line 7a, b. As can be seen in Figure 5, the coming of the inlet flange 9 refrigerant is flowing through a first partition wall 16 in two in the direction of the bottom portion 28th

Refrigerant streams 31a and 31b divided, which unite again in a collecting section 32 adjacent to the bottom portion 28 to a refrigerant flow 31c and enter the third chamber 21. The refrigerant flow 31c is in this case deflected by 180 ° and in turn upwards, that is guided in a direction away from the bottom portion 28 before it again in the region of the ceiling portion 29 (the third chamber 21) deflected by 180 ° and in the direction of the bottom portion 28 and in more Sequence through the outlet channel 10 in the pressure line 7a, b is conveyed. Refrigerants flow through the fourth chamber 22 and the fifth chamber 36 in a manner analogous to the flow processes taking place in the third chamber 21: refrigerant flows 31c 'and 31c "are conveyed from the bottom section 28 to the ceiling section 29 and back again to the bottom section 28 (the chambers 22, FIG. 36) before the refrigerant streams 31c 'and 31c''the Leave pressure silencer 6 through the outlet channel 10. In the outlet channel 10 thus unite all passed through the chambers 19, 20, 21, 22 and 36 refrigerant flows.

REFERENCE LIST Refrigerant compressor

 compressor housing

 compression chamber

 Piston-cylinder unit

a piston

b cylinder housing

 suction silencer

 discharge silencer

a, b pressure line

 Basic body of the pressure silencer inlet flange

0 exit channel

1 Side wall of the muffler2 Side wall of the muffler2a, 12b Part surfaces of the side wall 123 Side wall of the muffler4 Side wall of the muffler5 Edge on side wall 12

6 first partition

7 second partition

8 third partition 19 first chamber

 20 second chamber

 21 third chamber

 22 fourth chamber

23 Edge / bend of the electric motor

 24 stator core

 25 electric motor

 26 crankshaft

 27 axis of the crankshaft 26th

28 bottom section of the pressure silencer 6

 29 ceiling section of the pressure silencer 6

 30 connecting rods

 31a, 31b, 31c, 31C, 31c '' refrigerant flows

 32 collection area

33 Longitudinal extension of the side surfaces of the body

34 suction line

 35 valve plate

 36 fifth chamber

 37 fourth partition

38 fastener

 39 Bottom area of the compressor housing 2

40 undercuts to cylinder housing 4b Outline edges of the Statorblechpaktes or the stator blades rotor of the electric motor

Claims

A pressure muffler (6) for a hermetically sealed refrigerant compressor (1) comprising a piston-cylinder unit (4) which compresses a refrigerant and has a compression chamber (3) and is surrounded by a hermetically sealed compressor housing (2), the compression chamber ( 3) over one Suction muffler (5) is supplied with refrigerant coming from an evaporator and via the pressure muffler (6) by means of the piston-cylinder unit (4) compressed refrigerant in a pressure line (7a, b) emits, characterized in that the pressure muffler (6) a base body (8), on which an inlet flange (9) for the refrigerant coming from the piston-cylinder unit (4) is arranged, and an outlet channel (10) via which the refrigerant flows into a compressed line supplying a condenser with a refrigerant (7a, b) is convertible and which basic body (8) four Side walls (11,12,13,14) each with one Longitudinal extent and a comparison in comparison shorter width extension, wherein the two larger area side walls (11,12) facing each other and viewed in a direction parallel to the longitudinal direction of view are each designed curved in the same direction. Pressure muffler (6) according to claim 1, characterized in that the curvature of a surface larger side wall (11) is continuous, preferably following the shape of a circular arc. Pressure muffler (6) according to claim 1 or 2, characterized in that the curvature of the other larger area side wall (12) discontinuous, in shape at least two, at an angle to each other arranged partial surfaces (12a, 12b) takes place. Pressure silencer (6) according to one of claims 1 to 3, characterized in that the volume of the base body (8) by a plurality, the two larger side walls (11,12) connecting Partitions (16, 17, 18) in different Chambers (19, 20, 21, 22) is divided. Hermetically sealed refrigerant compressor (1), comprising a piston-cylinder unit (4), which compresses a refrigerant and has a compression chamber (3), driven by an electric motor (25), and a hermetically sealed compressor housing (2) surrounding the latter Compression chamber (3) is supplied via a suction muffler (5) coming from an evaporator refrigerant and via the pressure muffler (6) by means of the piston-cylinder unit (4) compressed refrigerant in a pressure line (7a, b), characterized the pressure silencer (6) surrounds an edge or bend (23) of the electric motor (25) or a part thereof and / or the piston-cylinder unit (4) in the direction of the edge or bend (23). Hermetically sealed refrigerant compressor (1) according to claim 6, characterized in that the edge or bend (23) is an edge of the laminated stator core (24) of the electric motor (25). Hermetically sealed refrigerant compressor (1) according to claim 5 or 6, characterized in that the Pressure silencer (6) has a base body (8) on which an inlet flange (9) for the coming of the piston-cylinder unit (4) refrigerant is arranged and an outlet channel (10), via which the refrigerant in a condenser with compressed refrigerant supplying pressure line (7a, b) can be transferred and which base body (8) has four side walls (11,12,13,14), each having a longitudinal extent and a shorter compared to a broader extent, the two in terms of area larger side walls (11,12) facing each other and viewed in a direction parallel to the longitudinal extension viewing direction are each designed curved in the same direction. 8. hermetically sealed refrigerant compressor (1) according to one of claims 5 to 7, characterized in that the curvature of a larger area side wall (11) takes place continuously, preferably following the shape of a circular arc. 9. Hermetically encapsulated refrigerant compressor (1) according to one of claims 5 to 8, characterized in that the curvature of the other larger area side wall (12) discontinuously, in the form of at least two, at an angle to each other arranged partial surfaces (12a, 12b) takes place , 10. Hermetically encapsulated refrigerant compressor (1) according to claim 9, characterized in that the pressure silencer (6) is attached to the piston-cylinder unit (4) that between the at least two partial surfaces (12 a, 12 b) formed Edge (15) immediately before the edge or bend (23) of the electric motor (25) and / or, the piston-cylinder unit (4) extends. 11. hermetically sealed refrigerant compressor (1) according to one of claims 5 to 10, characterized in that viewed in a line of sight along the axis (27) of the crankshaft (26) of the electric motor (25), the curvature of one of the larger area side walls (11 ) at least in sections, the curvature of the Compressor housing (2) in the region of the arrangement of the pressure muffler within the compressor housing (2) corresponds.