EP2027391B1 - Refrigerant condenser - Google Patents

Abstract

Hermetically encapsulated refrigerant condenser which has a hermetically sealed condenser housing (1), in the interior of which a piston/cylinder unit which condenses a refrigerant operates and an intake pipe (2) and a pressure pipe (3) are provided, wherein refrigerant flows to the piston/cylinder unit via the intake pipe (2) and the refrigerant which is condensed by the piston/cylinder unit is conveyed out of the condenser housing (1) via the pressure pipe (3), wherein connecting openings (5) for the intake pipe (2) and the pressure pipe (3) are provided on the condenser housing (1), wherein the attachment of the intake pipe (2) and the pressure pipe (3) to the connection openings (5) takes place via a connecting apparatus (9) in a hermetically sealed manner. There is provision according to the invention for the connecting apparatus (9) to have a body element (8) of preferably sleeve-shaped configuration and at least one spacer element (7) which spaces the body element (8) from the intake pipe (2) and the pressure pipe (3).

Description

FIELD OF THE INVENTION

The present invention relates to a hermetically sealed refrigerant compressor, which has a hermetically sealed compressor housing, in the interior of which a refrigerant-compressing piston-cylinder unit operates and a suction pipe and a pressure pipe is provided, via the suction pipe refrigerant to the piston-cylinder Unit flows and the compressed by the piston-cylinder unit refrigerant is transported out of the compressor housing via the pressure tube, wherein on the compressor housing connection openings for the suction pipe or the pressure tube are provided which the overflow of the refrigerant from outside the compressor housing to within the compressor housing and vice versa allow, wherein the connection of the suction pipe or the pressure tube to the connection opening via a connecting device hermetically sealed, according to the preamble of claim 1.

Such refrigerant compressors are used in domestic and industrial applications, where they are usually arranged on the back of a refrigerator or refrigerator. Your task is to compress a refrigerant circulating in the cooling system and weiterzubefördern, whereby heat dissipated from the interior of the refrigerator, delivered to the environment and a refrigerator or cooling rack is thus cooled in a known manner.

The refrigerant compressor has a hermetically sealed compressor housing and an electric motor, which via a crankshaft oscillating in a cylinder piston for Compressing the refrigerant drives. The compressor housing consists mostly of a cover part and a base part and has connection openings, wherein a suction tube, a pressure tube and possibly other lines are provided which lead through selbige connection openings in the compressor housing and out of this to the refrigerant to the cylinder and to transport this again into the cooling circuit.

Considering the large number of refrigerant compressors in operation in the world, any efficiency improvement made to a refrigerant compressor has significant energy savings potential, which is becoming increasingly important as global energy resources become scarcer.

Possibilities for improving the efficiency are in particular in the lowering of the temperature of the refrigerant at the beginning of the compression process. Each reduction of the suction temperature of the refrigerant in the cylinder of the piston-cylinder unit therefore causes as well as the lowering of the temperature during the compression process and, associated with the Ausschiebetemperatur a reduction in the required technical work for the compression process.

STATE OF THE ART

In known hermetically sealed refrigerant compressors is due to design a strong heating of the refrigerant on its way from the evaporator (refrigerator) to the intake valve of the piston-cylinder unit. As a result of the compression process, a considerable amount of heat is generated and this also transmits to the compressor housing, it comes naturally also to a heat transfer from Compressor housing on the pipe connections of the refrigerant compressor, in particular on the suction pipe.

The pressure pipe itself also indirectly causes additional heating of the suction pipe and thus of the refrigerant immediately before the compression cycle. Since the condensed refrigerant discharged in the pressure tube has temperatures of up to 100 ° C., the pressure tube is strongly heated, which in particular also transfers to the compressor housing in the region of the connection opening and from there to the suction tube.

By thus heating the sucked refrigerant, a deterioration in the efficiency of the refrigerant compressor occurs.

In addition to a known from the prior art insulation of the guided in the interior of the compressor housing sections of the suction and pressure pipes also obtained ebendieser in the region of the connection openings, ie at the point at which the suction pipe or pressure tube and the compressor housing directly, special meaning.

From the US 6,361,293 a compressor housing is known with a consisting of two nested tube elements suction tube, said tube element having the smaller diameter having an O-ring, thickened end portion which contacts the inside of the other tube element. This measure is to ensure a mobility of the suction pipe connected to a cylinder housing. Because of the air gap between the outer diameter of the first tubular element and the inner diameter of the second tubular element, this also results in the connection area of the compressor housing certain insulating effect compared to the transported coolant, however, the achieved here reduction of heat transfer is relatively low, since the wall of the compressor housing ends directly on the intake manifold.

The US 2004/096338 A1 discloses a compressor housing having a guided through the wall of the compressor housing, tubular body member for receiving a pressure tube, wherein between the body member and the pressure tube, a likewise tubular insert or spacer element is arranged. The spacer element is welded to the end of the pressure tube, while the body element is welded end to the spacer element.

From the US Pat. No. 6,257,846 B1 is a hermetically sealed compressor housing with a pipe connection device known, wherein a guided through the wall of the compressor housing outer and an inner sleeve member are provided. Within the inner sleeve member, a suction tube is held. Inner and outer sleeve member and the suction tube are soldered together at the same time.

From the EP 0 430 790 A1 a compressor housing is known, whose components are provided in adjoining areas with a hermetically sealing layer or a bead to dampen vibrations. Here, a pressure pipe connection is disclosed with a made of elastic material body member. This body element is attached by means of an adhesive layer on the Geäusewandung and the pressure tube.

PRESENTATION OF THE INVENTION

It is therefore the object of the present invention to reduce the efficiency losses of the refrigerant compressor resulting from the heating of the drawn-in refrigerant in the region of the connection openings of the compressor housing and to optimize the efficiency of refrigerant compressors. For this purpose, a connection device is to be created, which significantly reduces the heat transfer between the compressor housing and suction pipe or pressure pipe, so that the lowest possible temperature level of the refrigerant at the beginning of the compression process, ie when sucking into the cylinder of the piston-cylinder unit is ensured.

According to the invention, this object is achieved by a refrigerant compressor having the characterizing features of claim 1.

A refrigerant compressor has a hermetically sealed compressor housing, in the interior of which a refrigerant-compressing piston-cylinder unit operates and a suction pipe and a pressure pipe is provided, via the suction pipe in a known manner, a refrigerant flows to the piston-cylinder unit and of the piston-cylinder unit compressed refrigerant is transported out of the compressor housing via the pressure tube, wherein on the compressor housing connection openings for the suction pipe or the pressure tube are provided, which allow the overflow of the refrigerant from outside the compressor housing to within the compressor housing and vice versa, the connection of the suction pipe and the pressure tube to the connection opening via a connecting device hermetically sealed. The connecting device has a preferably sleeve-shaped body member and at least one Distance element, which distances the body element from the suction pipe or pressure tube. The body element is thus not in direct contact with the suction pipe or pressure tube or the heat is introduced into the body element only to a reduced extent on the spacer element.

According to the invention, the body element outside the connection opening, this hermetically sealing enclosing, attached to an outer side of the compressor housing, and the spacer element is disposed between the body member and suction / pressure tube and enclosing the suction tube / pressure tube hermetically sealing.

The body element may in this case be fastened either directly to the compressor housing with an end face or else by means of an abutment section angled for example by 90 °.

By the heat transfer from the compressor housing is reduced to the suction pipe or from the hot pressure tube to the compressor housing and subsequently to this on the suction pipe, a considerable reduction in the temperature of the guided in the intake manifold and immediately before the compression process in the piston-cylinder unit standing refrigerant and thus achieved an increase in the efficiency of the refrigerant compressor. By avoiding the heat transfer from the hot pressure tube to the compressor housing, heating of the compressor housing itself as well as the inside of the compressor housing (oil, internal refrigerant, compressor housing temperature) is also reduced, thereby also less heating the sucked gas, resulting in an improvement in efficiency.

According to the characterizing features of claim 2, the body element and preferably also the spacer element is made of austenitic steel. Austenitic steel is characterized in the present application by its compared to unalloyed steel reduced thermal conductivity and high corrosion resistance, toughness and high heat resistance.

According to another preferred embodiment of the invention, the spacer element is made of foam glass, plastic or ceramic material. Due to their low heat transfer coefficients, the abovementioned materials cause a strong reduction of the undesirable heat transfer from the compressor housing or from the body member in direct contact with the intake manifold and vice versa from the pressure pipe to the body member and the compressor housing.

In addition to a direct arrangement of a separate, insulating-acting spacer element between the body member and suction tube or pressure tube, it is also possible in an alternative embodiment, to design the body element and spacer element as an integral component. In this way, it is provided that the spacer element is designed as a section, preferably an end section of the body element, which runs at an angular inclination, preferably a right angle, to the axis of the suction tube or pressure tube around the suction tube or pressure tube hermetically sealing. Thus, by this geometry is due to the fact that the inner diameter of the body element - only with the exception of its end portion - is always greater than the outer diameter of the suction tube / pressure tube, an air cushion is formed between the suction tube / pressure tube and the body element, which has insulating function and the unwanted heat transfer between intake manifold / pressure tube and compressor housing greatly reduced. This embodiment allows a simple and economical way of manufacturing the connection device.

In this embodiment, it is provided according to the characterizing features of claim 3, that the portion or end portion of the body member surrounds the suction tube / pressure tube at a portion of its longitudinal extent, which outside the connection opening or outside a projected in the normal direction on the peripheral surface of the body panel cross-sectional area the compressor housing is located. Thus, by the contact surface of the portion or end portion of the body member with the suction pipe / pressure pipe is located as far away from the contact surface of the body member with the compressor housing, the bridged route of the heat transport is extended and the heat transfer between intake manifold / pressure tube and compressor housing as large as possible Obstacle in the way.

To embrace the suction tube / pressure tube in an optimal manner hermetically sealing, designed as a spacer element end portion of the body element according to the characterizing features of claim 4 is provided with an annular opening.

According to the characterizing features of claim 5, the body member has a stopper portion with which that is attached to the outside of the compressor housing. The diameter of the connection opening is in this case preferably larger than the outer diameter of that portion of the body element which is passed through the connection opening. In this way it is ensured that a contact surface of the connection opening does not touch the body element, but is spaced therefrom. Also by this measure, the insulating function of the connecting device according to the invention is increased and reduces the heat transfer between the intake manifold / pressure tube and the compressor housing.

Both the body element and the spacer can be carried out in several parts according to the characterizing features of claim 6 in order to allow further manufacturing or thermal advantages.

BRIEF DESCRIPTION OF THE FIGURES

Fig.1

einen Basisteil eines Verdichtergehäuses in Schrägansicht

Fig.2

einen Basisteil eines Verdichtergehäuses in Draufsicht

Fig.3

eine partielle Schnittdarstellung des Verdichtergehäuses aus Fig.2 entlang Linien A-A bzw. B-B mit einer Anschlussvorrichtung nach dem Stand der Technik

Fig.4

eine vergrößerte Darstellung des Details A aus Fig.3

Fig.5

eine alternative Ausführungsvariante einer Anschlussvorrichtung nach dem Stand der Technik

Fig.6

eine weitere alternative Ausführungsvariante einer Anschlussvorrichtung nach dem Stand der Technik

Fig.7

eine weitere alternative Ausführungsvariante einer Anschlussvorrichtung nach dem Stand der Technik

Fig.8

eine weitere alternative Ausführungsvariante einer Anschlussvorrichtung nach dem Stand der Technik

Fig.9

eine weitere Ausführungsvariante einer Anschlussvorrichtung nach dem Stand der Technik.

Fig.10

eine Ausführungsvariante einer erfindungsgemäßen Anschlussvorrichtung

Fig.11

eine weitere Ausführungsvariante einer erfindungsgemäßen Anschlussvorrichtung

Fig.12

eine weitere Ausführungsvariante einer erfindungsgemäßen Anschlussvorrichtung

The invention will now be explained in more detail with reference to an embodiment. Showing:

Fig.1

a base part of a compressor housing in an oblique view

Fig.2

a base part of a compressor housing in plan view

Figure 3

a partial sectional view of the compressor housing Fig.2 along lines AA and BB with a connection device according to the prior art

Figure 4

an enlarged view of the detail A from Figure 3

Figure 5

an alternative embodiment of a connection device according to the prior art

Figure 6

a further alternative embodiment of a connection device according to the prior art

Figure 7

a further alternative embodiment of a connection device according to the prior art

Figure 8

a further alternative embodiment of a connection device according to the prior art

Figure 9

a further embodiment of a connection device according to the prior art.

Figure 10

an embodiment of a connecting device according to the invention

Figure 11

a further embodiment of a connecting device according to the invention

Figure 12

a further embodiment of a connecting device according to the invention

WAYS FOR CARRYING OUT THE INVENTION

A refrigerant compressor has a hermetically sealed compressor housing 1, into which a suction pipe 2, a pressure pipe 3 and a service pipe 4 open via connection openings 5.

In a known manner flows via the suction pipe 2, a refrigerant to a disposed within the compressor housing 1 (not shown) piston-cylinder unit in which a compression of the refrigerant takes place, wherein the pressure tube 3, the compressed and therefore highly heated refrigerant as a result the piston-cylinder unit leads out of the compressor housing 1 out into a (also not shown) cooling circuit of a cold room. The piston-cylinder unit is driven by an electric motor via a crankshaft, so that the cooling space associated with the refrigerant compressor is continuously cooled by means of the circulating refrigerant.

The compressor housing 1 has a plurality of stand elements 6, by means of which it can be positioned on a predetermined footprint of a cooling device.

Although in this context in Fig.1 only one base part of a compressor housing 1 is shown, on which in the sequence a (not shown) cover part is placed, the compressor housing 1 can also be configured in other ways, for example in the form of an obliquely divided or otherwise composite compressor housing 1. Likewise, it is conceivable , Suction tube 2, pressure tube 3 or service pipe 4 to lead over the cover part into the interior of the compressor housing, wherein suction tube 2, pressure tube 3 is not necessarily as in Fig.1 shown, must run in pairs next to each other, but also in any staggered connection openings 5 of the compressor housing 1 open or can lead out of these.

The service pipe 4 is used only for filling the compressor housing 1 with a suitable refrigerant or with an oil required for lubrication.

Fig.2 shows a plan view of the in Fig.1 illustrated as an oblique view compressor housing 1 and forms with the therein drawn sectional guides AA and BB, the reference of in Fig. 3 shown, partial sectional view showing a conventional, known from the prior art pipe connection to the compressor housing 1. The suction pipe and / or the pressure pipe in this case pass through the connecting opening 5 through a connecting device 9 hermetically sealed to the compressor housing 1, the connecting device 9 in turn being hermetically sealed is connected to the suction pipe or pressure tube, preferably welded.

The FIGS. 4 and 5 also show pipe connections according to the prior art in detail view. Here, the compressor housing 1 is usually made of deep-drawn steel, while the suction tube 2 and the pressure tube 3 are made of copper, a copper-iron alloy or a pure iron material. As shown in Figure 4 It is customary to attach the suction tube 2 or pressure tube 3 by means of a connecting device 9 to the connection openings 5 of the compressor housing 1. For this purpose, for example, a steel disc is soldered to the suction tube 2 and pressure tube 3 and this system welded in a further operation to the compressor housing 1. The connection opening 5 or the surrounding area of the compressor housing 1 can be prepared in such a way that a positive contact between the contacting surfaces of the compressor housing 1 and the connection device 9 is made possible, for example by both the connection device 9 and on Compressor housing 1 provided, mutually corresponding chamfers 14 (FIG. Figure 4 ).

Another way of connecting the suction pipe 2 and the pressure pipe 3 to the compressor housing 1 is in Figure 5 shown, wherein a Cu or a Cu-Fe tube is shown, which was compressed and with a formed in the course of compression arched projection of the tube cross section at a chamfer 14 of the connection opening 5 of the compressor housing 1 is a stop and there eg by welding the compressor housing 1 is hermetically sealed.

FIGS. 6 to 8 show other known from the prior art connection possibilities for the suction pipe 2 / pressure tube 3 with a stop of the connecting device 9 on the outer side 13 of the compressor housing 1 (FIG. Figure 7 ), a pipe connection with a stop of the connecting device 9 on the inside 12 of the compressor housing 1 ( Figure 8 ) or a pipe connection without stop of the connection device 9 on the compressor housing 1 ( Figure 9 ).

Regardless of how the pipe connection according to the previously described FIGS. 3 to 8 may be configured concretely, is given in the known connection variants of the circumstance that a made of a metallic material or of a metal alloy connecting device 9 a high heat transfer from the compressor housing 1 to the suction pipe 2 and from a highly heated coolant with pressure tube leading 3rd on the compressor housing 1 and thus in turn on the with the compressor housing 1 in direct or via the connecting device 9 in indirect contact suction tube 2 permits. However, unimpeded heat transfer at the representational points is undesirable for the reasons already described above and reduces the efficiency of the refrigerant compressor, since the refrigerant sucked into the cylinder of the piston-cylinder unit is unnecessarily heated in this case.

In order to significantly reduce such a heat transfer from the compressor housing 1 to the suction pipe 2 and from the pressure pipe 3 to the compressor housing 1, the connecting device 9 has a body element 8 and at least one spacer element 7 which distances the body element 8 from the suction pipe 2 or pressure pipe 3 , The body element 8 is therefore no longer in direct contact with the suction tube 2 or pressure tube 3, or the contact zones between these elements are kept very small.

According to the invention the body element 8 outside the connection opening 5, this enclosing, arranged on the compressor housing 1 ( Figure 10 ). The body element 8 is in this case fastened with an obtuse cross-sectional area directly on the outer side 13 of the compressor housing 1. Likewise, however, may be provided for more stable attachment of the body element 8, for example, an angled by 90 ° stop section.

If the body element 8 is not arranged on the outer side 13, but on the inner side 12 of the compressor housing 1 (see in FIG Figure 11 shown), a rear ventilation space is formed between the suction pipe 2 / pressure tube 3 and the body element 8, which communicates via the connection opening 5 of the compressor housing 1 with the direction indicated by the arrows 15 ambient air outside the compressor housing 1 and allows an additional cooling effect. The diameter of the connection opening 5 is formed larger than the diameter of the suction tube 2 / pressure tube 3 for this purpose.

Figure 11 already shows an alternative embodiment of the connecting device 9, wherein the body element 8 and spacer element 7 are designed as an integral component. Here, the spacer element 7 is formed as an end portion of the body member 8, which at an angular inclination, preferably a right angle, to the axis of the suction pipe 2 / pressure tube 3 extends to hermetically seal the suction tube 2 / pressure tube 3, for example by soldering or welding.

The body element 8 is preferably designed sleeve-shaped, thus has a substantially parallel to the axis of the suction tube 2 / pressure tube 3 and to the axis of the connection opening 5 extending wall section on (see Figure 9 ). Optionally, however, may be provided instead of a rotationally symmetrical shape of the body member 8, any other shape of the embodiment. Also, the body member 8 may be configured convex, concave or irregular geometry instead of a sleeve-shaped or cylindrical shape. It is essential, however, always that the body member 8, the suction tube 2 / pressure tube 3 is not touched over a length which allows unhindered heat transfer, but is distanced from this, albeit minimal, via a spacer element 7.

In order to secure the body member 8 reliably on the compressor housing 1, it may be provided with a stopper portion 10 which rests against the outside 13 or on the inside 12 of the compressor housing 1 and fixed there in a known manner, that is, for example, soldered or welded. The stop section 10 is preferably an integral part of the body element 8, which receives its desired dimensioning in the bending or deep-drawing process. In the case of a multi-part embodiment of the body member 8, the stopper portion 10 but also be made as a separate element which is soldered or welded to the sleeve-shaped body member 8.

In order to further reduce the heat transfer between the compressor housing 1 and suction pipe 2 / pressure tube 3, the diameter of the connection opening 5 in this case is dimensioned larger than the outer diameter of that portion of the body element 8, which is passed through the connection opening 5. This ensures that an abutment surface 11 of the connection opening 5 does not touch the body element 8, but is spaced therefrom. In this way, an annular gap is formed between the body element 8 and abutment surface 11, in which outside air can circulate and the connection device 9 can cool.

In the choice of suitable materials for the spacer element 7, in particular its coefficient of thermal conductivity λ is of decisive importance, which defines the amount of heat passing through a layer of the surface and thickness unit at 1 K temperature difference in a time unit and expressed in W / (m * K) becomes. While copper (depending on the temperature) has a comparatively high coefficient of thermal conductivity λ of about 380 W / (m * K), λ for unalloyed steel is about 100 W / (m * K). By means of admixing suitable alloying elements such as chromium, nickel, manganese or molybdenum, however, the thermal conductivity coefficient λ of steel can be significantly reduced. For example, Cr-Ni steel may have a thermal conductivity coefficient λ of less than 20 W / (m * K).

Foam glass with a coefficient of thermal conductivity λ of about 0.05 W / (m * K) has proved to be particularly favorable in tests of the already mentioned material. foam glass thus has only a slightly larger λ value than air with 0.024 W / (m * K).

Likewise, ceramic materials have proven to be very advantageous in the present field of application, especially those based on metal oxides. For example, so-called special ceramic materials or technical materials such as highly sintered oxide ceramics of aluminum, magnesium, beryllium or zirconium oxide can be used.

Preferably, it is solderable ceramic materials, so that a perfect soldering of spacer element 7 and suction tube 2 / pressure tube 3 on the one hand and the body element 8 or even compressor housing 1 is made possible to achieve the required tightness.

The ceramic materials prove, in addition to their low thermal conductivity [λ = 0.5-1.4 W / (m * K)] and corrosion resistance also due to their fire, temperature and dimensional stability as particularly favorable for use for the isolation of suction tube. 2 / Pressure tube 3 at its junction on the compressor housing. 1

Also, temperature and aging resistant plastics can be used as materials for the spacer element 7, which are then applied by suitable fastening measures such as shrinking, gluing, laser, encapsulation or lamination on the suction tube 2 / pressure tube 3.

Due to their low heat transfer coefficients, the abovementioned materials cause a strong reduction of the undesired heat transfer from the compressor housing 1 or from the body element 8 which is in direct contact therewith on the suction tube 2 and vice versa from the pressure tube 3 on the body element 8 and the compressor housing. 1

Austenitic steel is preferred as the material for the body element 8. Austenitic steel in the present field of application is characterized by its alloying content (e.g., Cr-Ni or Mg alloys) having reduced thermal conductivity and high corrosion resistance, toughness and high heat resistance. At the same time, however, this material also enables the hermetically sealed connection of the body part 8 to the compressor housing by means of welding.

Also Figure 10 shows an alternative embodiment of the connecting device 9, wherein the body element 8 and spacer element 7 are designed as an integral component. Here, the spacer element 7 is formed as an end portion of the body member 8, which at an angular inclination, preferably a right angle, to the axis of the suction pipe 2 / pressure tube 3 extends to hermetically seal the suction tube 2 / pressure tube 3, for example by soldering or welding.

As shown in the illustration Figure 10 can be seen, the inner diameter of the sleeve-shaped body member 8 is always larger than the outer diameter of the suction tube 2 / pressure tube 3, so that between the suction tube 2 / pressure tube 3 and the body member 8, an air cushion (gas mixture, refrigerant) is formed, which has insulating function and the heat transfer between intake manifold 2 / pressure pipe 3 and compressor housing 1 also greatly reduced. Likewise, the end portion of the body member 8 may also be a separately manufactured element, which is attached to the end face of the sleeve-shaped body member 8 and the suction tube 2 / pressure tube 3 surrounds. It is essential that the heat flow from the body member 8 to the suction pipe 2 and the pressure tube 3 on the body member 8 is made in the absence of contact between the body member and suction tube 2 / pressure tube 3 only via the spacer element 7, wherein the body member 8 and spacer element 7 can be made in one piece but also in several pieces.

Also, the body member 8 in the reverse than in Figure 10 be arranged shown position, ie arranged in the region of the inner side 12 of the compressor housing 1 end portion as a spacer element 7, wherein the suction tube / pressure pipe section in the region of the connection opening undergoes ventilation and cooling by the compressor housing 1 surrounding air.

As in Figure 10 Furthermore, the end portion of the body member 8 surrounds the suction tube 2 / pressure tube 3 at a portion of its longitudinal extent, which is outside the connection opening 5 or outside a projected in the normal direction on the peripheral surface of the body member 8 wall cross-sectional area of the compressor housing 1. The contact surface of the end portion of the body member 8 with the suction pipe 2 / pressure tube 3 is therefore not arranged in the immediate vicinity of the contact surface of the body member 8 with the compressor housing 1, but in a the insulating function conducive distance to this.

In order to surround the suction tube 2 / pressure tube 3 and to allow a hermetically sealing connection to this, designed as a spacer element 7 end portion of the body member 8 is provided with an annular opening, within which the suction tube 2 / pressure tube 3 is tightly secured.

In order to achieve further manufacturing or thermal advantages in the respective application, it may be expedient to carry out the body element 8 and / or the spacer element 7 in several parts. A multi-part body element 8, consisting of several interlocking elements has the advantage of greater flexibility in manufacturing and in the surface treatment and allows a specific configuration of the connection system depending on the present requirements and applications.

In Figure 12 Finally, a particular embodiment of a connecting device 9 is shown, which has a preferably made of foam glass, plastic or ceramic material spacer element 7 ', wherein the spacer element 7' L-shaped and arranged directly between abutting surface 11 of the connection opening 5 and suction tube 2 / pressure tube 3 is. A leg portion 16 of the spacer element 7 'is in this case enclosed by the body element 8 and pressed against the outer side 13 of the compressor housing 1. The spacer element 7 'must therefore not necessarily have a hermetically sealing function in this construction, if the body member 8 is hermetically sealed both with the compressor housing 1 and with the suction pipe 2 / pressure tube 3. It is thus given the advantage with this construction, that for the spacer element 7 'also materials can be used, with which it is difficult to produce a hermetically sealing connection to another medium, in particular those materials which are not solderable or weldable ,

Claims (6)

1. A hermetically encapsulated refrigerant compressor, comprising a hermetically sealed compressor housing (1), in the interior of which there are disposed a piston-cylinder unit which compresses a refrigerant, a suction pipe (2) and a pressure pipe (3), with refrigerant flowing via the suction pipe (2) to the piston-cylinder unit and the refrigerant compressed by the piston-cylinder unit being conveyed out of the compressor housing (1) via the pressure pipe (3), with connection openings (5) for the suction pipe (2) and the pressure pipe (3) being provided on the compressor housing (1), which openings enable the overflow of the refrigerant from the outside of the compressor housing (1) into the interior of the compressor housing (1) and vice versa, with the connection of the suction pipe (2) and pressure pipe (3) to the connection openings (5) occurring in a hermetically tight manner by means of a connection apparatus (9), with the connection apparatus (9) comprising a preferably sleeve-like body element (8) and at least one spacer element (7) which spaces the body element (8) from the suction pipe (2)/pressure pipe (3), and the body element (8) is attached to an outside (13) of the compressor housing (1) outside of the connection opening (5) by enclosing the same in a hermetically sealing manner, characterized in that the spacer element (7) is arranged between the body element (8) and the suction pipe (2)/pressure pipe (3) and encloses the suction pipe (2)/pressure pipe (3) in a hermetically sealing manner, and the spacer element (7) is a section, preferably an end section of the body element (8), which extends under an angular inclination, preferably a right angle, relative to the axis of the suction pipe (2)/pressure pipe (3) and encloses the suction pipe (2)/pressure pipe (3) in a hermetically sealing manner.
2. A hermetically encapsulated refrigerant compressor according to claim 1, characterized in that the body element (8) is made of austenitic steel.
3. A hermetically encapsulated refrigerant compressor according to claim 1 or 2, characterized in that the section or end section of the body element (8) encloses the suction pipe (2)/pressure pipe (3) at a section of the circumference which lies outside of the connection opening (5) or outside of cross-sectional wall surface of the compressor housing (1) which is projected in the normal direction onto the circumferential surface of the body element (8).
4. A hermetically encapsulated refrigerant compressor according to one of the claims 1 to 3, characterized in that the section or end section of the body element (8) which is arranged as a spacer element (7) ends in an annular opening.
5. A hermetically encapsulated refrigerant compressor according to one of the claims 1 to 4, characterized in that the body element (8) has a contact section (10) and is fastened with the same to the outside (13) of the compressor housing (1), with the diameter of the connection opening (5) preferably being larger than the outer diameter of the section of the body element (8) which is guided through the connection opening (5), so that an abutting surface area (11) of the connection opening (5) is spaced from the body element (8).
6. A hermetically encapsulated refrigerant compressor according to one of the claims 1 to 5, characterized in that the body element (8) and/or the spacer element (7) are arranged in several parts.

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