US20100226805A1 - Refrigerant compressor - Google Patents
Refrigerant compressor Download PDFInfo
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- US20100226805A1 US20100226805A1 US12/798,398 US79839810A US2010226805A1 US 20100226805 A1 US20100226805 A1 US 20100226805A1 US 79839810 A US79839810 A US 79839810A US 2010226805 A1 US2010226805 A1 US 2010226805A1
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- Prior art keywords
- pipe
- connector
- pressure pipe
- connection pipe
- pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/123—Fluid connections
Definitions
- the invention relates to a refrigerant compressor, comprising a hermetically sealed compressor housing, in whose interior a piston-cylinder unit which compresses a refrigerant operates, which sucks in refrigerant from outside the compressor housing via a suction pipe and expels the refrigerant under compression via a pressure section, which is formed by a pressure pipe manufactured from plastic and a connection pipe manufactured from metal, in the direction of a condenser situated outside the compressor housing, according to the preamble of Claim 1 .
- the refrigerating machine process using zeotropic gases has been known per se for some time.
- the refrigerant is heated by absorbing energy from the space to be cooled in the vaporizer and finally overheated, which results in vaporization, and is compressed to a higher pressure level using a piston-cylinder unit of the refrigerant compressor, where it dissipates heat via a condenser and is conveyed back into the vaporizer via a throttle, in which pressure reduction and cooling of the refrigerant occur.
- Such refrigerant compressors are predominantly used in refrigerators or refrigerated shelves.
- the yearly produced piece count is correspondingly high. Any technical improvement which is performed on a refrigerant compressor and reduces the production costs thus offers enormous savings potential when multiplied by the refrigerant compressors used worldwide.
- refrigerant compressors are also sources of noise, which can sometimes be annoying during the operation of the refrigerant compressor.
- the vibrations arising through the operation of the piston-cylinder unit and its drive motor also stress all parts of the refrigerant compressor which are subject to these vibrations, however.
- DE 31 02 576 A1 discloses a pipe connection, a first pipe being pluggable into a widened end area of a second pipe.
- the outer jacket of the first pipe is provided with two film-type coatings situated adjacent to one another, namely with a silicone rubber layer and an adhesive layer. Both coatings have a layer thickness between 0.5 and 0.75 mm. Because of this relatively low layer thickness, a pipe connection of this type is not suitable for use in a pressure pipe attachment of refrigerant compressors according to the species, because the coatings could wear in case of relative movements between the pressure pipe and the connection pipe and the danger of a leak would result in the present connection area.
- WO 2007/011247 A discloses a refrigerant compressor having a pressure pipe manufactured from plastic, whose end section is crimped to a connection pipe leading in the direction of a condenser. The end section of the connection pipe is widened into a funnel shape for this purpose.
- a connection pipe which is manufactured from metal, of a refrigerant compressor.
- the continuous flow of the refrigerant exiting from the piston-cylinder unit is not to be obstructed.
- a refrigerant compressor having the characterizing features of Claim 1 .
- a refrigerant compressor according to the species has a hermetically sealed compressor housing, in whose interior a piston-cylinder unit which compresses a refrigerant operates, which is connected to a suction pipe and a pressure pipe, a refrigerant flowing to the piston-cylinder unit via the suction pipe, and the refrigerant compressed therein being guided along a pressure section, which is formed by a pressure pipe, which is manufactured from plastic, and a connection pipe, which adjoins the pressure pipe and is manufactured from metal, through the interior of the compressor housing and then to the exterior of the compressor housing.
- the pressure pipe is connected to form a seal to the connection pipe, which is manufactured from metal, using a sleeve-shaped connector, which is manufactured from plastic and situated between the pressure pipe and the connection pipe, the connection pipe having an at least sectionally constricted end section facing toward the pressure pipe, which secures the connector situated inside the connection pipe in its axial location.
- the differing coefficient of thermal expansion of the pressure pipe manufactured from plastic from the connection pipe manufactured from metal can be ideally compensated for and leaks of the pressure section can thus be prevented.
- an opening cross-section of the connector which adjoins the end area of the pressure pipe and is delimited by a connector inner surface, is greater than or equal to a flow cross-section of the pressure pipe delimited by the pressure pipe inner surface.
- an outer side of the pressure pipe is jacketed to form a seal by the connector, the connector having a sealing connection to the connection pipe.
- the sealing connection between the connector and the connection pipe is produced by a seal element situated between the connector and the connection pipe.
- This seal element is preferably an O-ring, which is held in a groove provided on an outer side of the connector. In this way, a simple and cost-effective seal is made possible between the connector and the connection pipe.
- seal element may be provided between the connector and the connection pipe, such as a seal using adhesive or by providing a press fit between the connector and the connection pipe.
- the inner surface of the connector is implemented as stepped, a first inner surface section, which jackets the pressure pipe, and a second inner surface section, which adjoins an end area of the pressure pipe, preferably at a front side of the pressure pipe, and is essentially aligned with an inner surface of the pressure pipe or lies outside of it, of the connector are provided.
- the connector can be connected to the pressure pipe by gluing, welding, or extrusion coating.
- the connector is fastened on the pressure pipe using laser welding technology.
- at least the section of the connector adjoining the pressure pipe is transparent to at least infrared wavelengths in the range between 800 and 960 nm.
- an infrared laser welding device provided for this purpose can radiate through the jacket of the connector and achieve a suitable welding temperature in the contact area between the pressure pipe outer side and the connector inner surface in this way.
- a connection of the pressure pipe to the connector of this type using infrared laser welding technology has an ultra-reliable sealing effect and allows economic manufacturing.
- connection pipe is crimped to the connector.
- the outer side of the connector has a complementary geometry prepared for crimping with the connection pipe, preferably in the form of a concave recess.
- the connector is produced from an elastomeric plastic in a preferred embodiment.
- Connectors manufactured from an elastomeric material may deform elastically under tension, pressure, or bending strain, so that greater robustness of the pressure section in relation to mechanically or thermally related force actions is achieved.
- connection pipe is fastened, preferably welded, on a wall of the compressor housing at the height of an end section of the pressure pipe which is held in the assembly location in the connection pipe or in the connector.
- FIG. 1 shows a perspective illustration of a refrigerant compressor having a compressor housing and an incoming suction pipe and an outgoing pressure section
- FIG. 2 shows a schematic illustration of the interior of the refrigerant compressor according to FIG. 1 , only the parts relevant for the invention being shown for better clarity
- FIG. 3 shows an attachment according to the invention of a pressure pipe to a connection pipe using a plastic connector in a detail sectional view
- FIG. 4 shows an alternative embodiment of the pressure pipe attachment according to the invention in a detail sectional view
- FIG. 5 shows an alternative embodiment of the pressure pipe connection according to the invention in a detail sectional view
- FIG. 6 shows an alternative embodiment of the pressure pipe connection according to the invention having a crimped connection pipe in a detail sectional view
- FIG. 7 shows an alternative embodiment of the pressure pipe connection according to the invention having a crimped connection pipe in a detail sectional view
- FIG. 8 shows an alternative embodiment of the pressure pipe connection according to the invention having a crimped connection pipe in a detail sectional view
- FIG. 1 shows a refrigerant compressor in a perspective view having a compressor housing 1 with a suction pipe 2 and a pressure section 3 , 6 , which is formed by a pressure pipe 3 and a connection pipe 6 .
- the suction pipe 2 leads into the interior 8 of the compressor housing 1 and guides a refrigerant coming from a vaporizer (not shown) to a piston-cylinder unit 4 installed on the base plate 16 in the compressor housing 1 , in order to compress the refrigerant expanded in the vaporizer again.
- the compressed refrigerant is guided away from the piston-cylinder unit 4 again and/or guided out of the interior 8 of the compressor housing 1 via the pressure section 3 , 6 (see also FIG. 2 ).
- This section is also designated as a “serpentine”.
- the end area 3 c of the pressure pipe 3 is provided for connection to a connection pipe 6 situated outside the compressor housing 1 , which is also part of the pressure section 3 , 6 , but is further away from the piston-cylinder unit 4 than the pressure pipe 3 .
- the pressure section 3 , 6 further also comprises a pressure sound damper 18 , which can also be situated outside the compressor housing 1 , however.
- the pressure pipe 3 is manufactured from plastic, such as a thermoplastic, duroplastic, or elastomeric plastic.
- connection pipe 6 to be attached to the pressure pipe 3 is manufactured from metal.
- the connection pipe 6 preferably comprises copper, a copper alloy, or steel, but it can also be implemented from other metal materials and have optional jacket or internal coatings.
- the material copper has a coefficient of expansion approximately four times as high as plastic and operating temperatures of up to 120° C. result in the interior of the compressor housing 1 , special requirements are placed on a connection of the pressure pipe 3 and the connection pipe 6 to ensure the tightness of the pressure section 3 , 6 .
- the pressure pipe 3 is connected using a sleeve-shaped connector 5 , which is manufactured from plastic and is situated between the pressure pipe 3 and the connection pipe 6 , to the connection pipe 6 , which is manufactured from metal.
- connection pipe 3 does not necessarily have to be located inside and the connection pipe 6 does not necessarily have to be located outside the compressor housing 1 .
- the connection area between pressure pipe 3 and connection pipe 6 and/or the attachment according to the invention shown in the figures using a connector 5 can be in an arbitrary area of the pressure section 3 , 6 , i.e., thus also inside or outside the compressor housing 1 .
- the connector 5 can be manufactured, for example, from polyamide (PA), polyethylene (PE), polypropylene (PP), syntactic polystyrene (SPS), or polytetrafluoroethylene (PTFE).
- the connector 5 is preferably produced from a thermoplastic, in order to allow good welding capability of the connector 5 to the pressure pipe 3 .
- a connector 5 which is pressed or glued into the connection pipe 6 and manufactured from thermoplastic can also move with the connection pipe 6 in case of heating thereof and thus allow a better seat of the connector 5 in the connection pipe 6 .
- FIG. 3 shows a first embodiment variant of the pressure pipe attachment according to the invention.
- the connection pipe 6 coming from the exterior 9 and/or leading to the vaporizer protrudes somewhat into the interior 8 of the compressor housing 1 , which is provided with a through opening 17 , and is connected, e.g., welded on an outer side 6 b to the compressor housing 1 .
- the connector 5 is inserted, preferably pressed into the connection pipe 6 and is secured thereby in its axial location, in that the connection pipe 6 has a constricted end section 6 c facing toward the pressure pipe 3 , which encompasses a front side 5 c of the connector 5 situated inside the connection pipe 6 at least on one point of its circumference and/or secures it against axial shifting.
- the end section 6 c of the connection pipe 6 is bent over and/or compressed in the direction of an outer side 3 b of the pressure pipe 3 .
- the outer side 3 b of the pressure pipe 3 is jacketed to form a seal by an inner surface 5 a of the connector 5 .
- the inner surface 5 a, 5 a ′ of the connector 5 is implemented as stepped, a first inner surface section 5 a, which jackets the pressure pipe 3 , and a second inner surface section 5 a ′, which adjoins the end area 3 c of the pressure pipe 3 and/or its front side, of the connector 5 being provided.
- a flow cross-section 11 of the connector 5 which adjoins the end area 3 c of the pressure pipe 3 and is defined by the second inner surface section 5 a ′, is greater than or equal to a flow cross-section 10 of the pressure pipe 3 defined by an inner surface 3 a of the pressure pipe 3 .
- the second inner surface section 5 a ′ of the connector 5 essentially aligns with the inner surface 3 a of the pressure pipe 3 and/or lies just outside the inner surface 3 a of the pressure pipe 3 (viewed in relation to the central axis).
- the refrigerant thus first flows through the flow cross-section 10 formed by the pressure pipe 3 , then the flow cross-section 11 , which is formed by the second inner surface section 5 a ′ of the connector 5 and is slightly enlarged in relation to the flow cross-section 10 of the pressure pipe 3 , and finally the flow cross-section 12 , which is formed by the connection pipe 6 and is in turn expanded in relation to the flow cross-section 11 of the connector 5 , the refrigerant does not have to pass a narrow point, but rather can expand unobstructed in the flow direction 15 .
- the connector 5 is attached on the pressure pipe 3 using sealing connection technologies, such as gluing, welding, pressing, or extrusion coating.
- the connector 5 is fastened on the pressure pipe 3 using infrared laser welding technology.
- at least the section of the connector 5 adjoining the pressure pipe 3 is implemented as translucent and/or transparent at least to infrared wavelengths in the range between 800 and 960 nm, in order to radiate through the jacket of the pressure pipe 3 using a suitable infrared laser welding device and achieve a welding temperature in the contact area between the outer side 3 b of the pressure pipe 3 and the inner surface 5 a of the connector 5 .
- the pressure pipe 3 in contrast, is manufactured from black or dark plastic, in order to allow optimum absorption of the energy emitted by the infrared laser welding device.
- the connector 5 which is connected to the pressure pipe 3 to form a seal also has a sealing connection to the connection pipe 6 .
- This sealing connection is produced in the exemplary embodiment shown by a seal element 7 situated between the connector 5 and the connection pipe 6 .
- the seal element 7 is an O-ring, which is held in a groove 13 provided on the outer side 5 b of the connector 5 and whose external diameter is at least greater than the internal diameter of the connection pipe 6 and/or the clearance of the flow cross-section 12 .
- the O-ring or the seal element 7 has a lenticular cross-section in FIG. 3 .
- the use of round, rectangular, or rhomboid O-rings 7 is also possible (see FIGS. 4 and 5 ).
- FIG. 4 an O-ring 7 is laid in the groove 13 of the connector 5 , whose cross-section has an essentially square shape, the sides of the cross-sectional square each being implemented as concave, so that two sealing contact lines result both toward the inner surface 6 a of the connection pipe 6 and also toward the outer side 5 a of the connector 5 .
- Such a design of the seal element 7 allows an even better guarantee of the tightness between the connection pipe 6 and the connector 5 .
- a specially implemented connector 5 which is manufactured from an elastomeric material, for example, could also be used.
- connection pipe 6 an alternative or additional possible seal between the connector 5 and the connection pipe 6 is possible, for example, by applying an adhesive to the connector outer side 5 b and/or the connection pipe inner surface 6 b or by providing a press fit between the connector outer side 5 b and the connection pipe inner surface 6 b. It is possible in particular for this purpose to achieve a form fit by hooking the connector 5 and the connection pipe 6 in one another.
- FIG. 6 shows an alternative embodiment of the invention, the connection pipe 6 being crimped to the connector 5 .
- the outer side 5 b of the connector 5 has a complementary geometry, which is prepared for crimping with the connection pipe 6 , in the form of a concave recess 14 .
- the connection pipe 6 is crimped at least at one point of its circumference using a suitable device, so that a jacket section 6 d of the connection pipe 6 presses against the concave recess 14 and thus causes axial fixing of the connector 5 held in the connection pipe 6 .
- the concave recess 14 of the connector 5 and/or the crimped jacket section 6 d of the connection pipe 6 are situated in a position which encloses the end area 3 c of the pressure pipe 3 held in the connector 5 .
- the area of the connector 5 located below the jacket section 6 d of the connection pipe 6 is pressed still more strongly against the pressure pipe 3 and the sealing effect between connector 5 and pressure pipe 3 is increased further.
- Such a configuration would prove advantageous in particular in the case of connectors 5 in an elastomeric embodiment, because providing a separate seal element 7 could be dispensed with.
- connection pipe 6 is fastened on the wall of the compressor housing 1 at the height of the end section 3 c of the pressure pipe 3 held in the connection pipe 6 and/or in the connector 5 .
- the seal elements 7 may also be used having arbitrary cross-sectional geometry and in arbitrary numbers (see also FIGS. 7 and 8 ) or, as already noted, may also be dispensed with, because a sufficient sealing effect to the connection pipe 6 is already achieved by a connector 5 having a sealing geometry.
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Abstract
A refrigerant compressor, comprising a hermetically sealed compressor housing (1), in whose interior (8) a piston-cylinder unit (4) compressing a refrigerant operates, which sucks in refrigerant from outside (9) the compressor housing (1) via a suction pipe (2) and expels the refrigerant under compression via a pressure section (3, 6), formed from a pressure pipe (3) manufactured from plastic and a connection pipe (6) manufactured from metal in the direction of a condenser situated outside (9) the compressor housing (1). In order to enable a reliable sealing connection between the pressure pipe (3) and the connection pipe (6), it is provided that the pressure pipe (3) is connected to form a seal to the connection pipe (6) using a sleeve-shaped connector (5), which is manufactured from plastic and is situated between the pressure pipe (3) and the connection pipe (6), the connection pipe (6) having an at least sectionally constricted end section (6 c), facing toward the pressure pipe (3), which secures the connector (5) situated inside the connection pipe (6) in its axial location.
Description
- The invention relates to a refrigerant compressor, comprising a hermetically sealed compressor housing, in whose interior a piston-cylinder unit which compresses a refrigerant operates, which sucks in refrigerant from outside the compressor housing via a suction pipe and expels the refrigerant under compression via a pressure section, which is formed by a pressure pipe manufactured from plastic and a connection pipe manufactured from metal, in the direction of a condenser situated outside the compressor housing, according to the preamble of
Claim 1. - The refrigerating machine process using zeotropic gases has been known per se for some time. The refrigerant is heated by absorbing energy from the space to be cooled in the vaporizer and finally overheated, which results in vaporization, and is compressed to a higher pressure level using a piston-cylinder unit of the refrigerant compressor, where it dissipates heat via a condenser and is conveyed back into the vaporizer via a throttle, in which pressure reduction and cooling of the refrigerant occur.
- Such refrigerant compressors are predominantly used in refrigerators or refrigerated shelves. The yearly produced piece count is correspondingly high. Any technical improvement which is performed on a refrigerant compressor and reduces the production costs thus offers enormous savings potential when multiplied by the refrigerant compressors used worldwide.
- However, refrigerant compressors are also sources of noise, which can sometimes be annoying during the operation of the refrigerant compressor. The vibrations arising through the operation of the piston-cylinder unit and its drive motor also stress all parts of the refrigerant compressor which are subject to these vibrations, however.
- It has been shown that a substantial part of the oscillation transmission from the piston-cylinder unit to the compressor housing is to be attributed to the pressure pipe. On the other hand, the pressure pipe must have a certain mobility, in order to be able to absorb the vibrations exerted by the piston-cylinder unit.
- Conventional pressure pipes are manufactured from metal materials having high moduli of elasticity. In order to fulfill the requirements with respect to oscillation transmission and durability, the pressure pipes are therefore accordingly implemented as long and situated curved multiple times in the interior of the compressor housing. Pressure pipes of this type are therefore also referred to as serpentines.
- In order to reduce the oscillation transmission from the piston-cylinder unit to the compressor housing and the noise development, it has therefore been proposed in AT 007 698 U1 to manufacture the pressure pipe from plastic in its section leading through the interior of the compressor housing. Furthermore, heating of the interior of the compressor housing by the compressed refrigerant located in the pressure pipe can be reduced and the efficiency of the refrigerant compressor can be increased by an embodiment of the pressure pipe from plastic.
- In the case of plastic pressure pipes of this type, the question arises of a suitable attachment of the pressure pipe leading out of the interior of the compressor housing to a metal connection pipe leading to the condenser. A problem results in this case because of the differing coefficients of thermal expansion of the connection pipe, which is manufactured from metal, typically copper or steel, and the pressure pipe manufactured from plastic, in particular because operating temperatures of approximately 120° C. are reached in the interior of the compressor housing and the danger of leaks between the pressure pipe and the connection pipe arises during cool down of the system to room temperature after the refrigerant compressor has been shut down.
- While metal pressure and connection pipes are soldered, screwed, or glued to one another in a conventional manner, those according to AT 007 698 U1 were connected to one another using thermoplastic joints, for example.
- However, no cross-section reduction of the pressure section formed by the pressure pipe and connection pipe in the flow direction of the refrigerant is to occur upon the connection of a pressure pipe manufactured from plastic and a connection pipe manufactured from metal, so as not to obstruct the continuous flow of the refrigerant exiting from the piston-cylinder unit. For this reason, fastening variants in which the pressure pipe is plugged onto the connection pipe are to be avoided.
- Furthermore, plugging the (tubular or serpentine) pressure pipe onto the connection pipe would not allow satisfactory automated assembly.
- DE 31 02 576 A1 discloses a pipe connection, a first pipe being pluggable into a widened end area of a second pipe. Before these pipes, which are manufactured from aluminum, are plugged into one another, the outer jacket of the first pipe is provided with two film-type coatings situated adjacent to one another, namely with a silicone rubber layer and an adhesive layer. Both coatings have a layer thickness between 0.5 and 0.75 mm. Because of this relatively low layer thickness, a pipe connection of this type is not suitable for use in a pressure pipe attachment of refrigerant compressors according to the species, because the coatings could wear in case of relative movements between the pressure pipe and the connection pipe and the danger of a leak would result in the present connection area.
- WO 2007/011247 A discloses a refrigerant compressor having a pressure pipe manufactured from plastic, whose end section is crimped to a connection pipe leading in the direction of a condenser. The end section of the connection pipe is widened into a funnel shape for this purpose.
- It is therefore the object of the present invention to provide a reliably sealing attachment capability for a pressure pipe to a connection pipe, which is manufactured from metal, of a refrigerant compressor. In particular, the continuous flow of the refrigerant exiting from the piston-cylinder unit is not to be obstructed.
- In addition, reliable automatic assembly of the pressure pipe attachment is to be made possible.
- This object is achieved by a refrigerant compressor having the characterizing features of
Claim 1. A refrigerant compressor according to the species has a hermetically sealed compressor housing, in whose interior a piston-cylinder unit which compresses a refrigerant operates, which is connected to a suction pipe and a pressure pipe, a refrigerant flowing to the piston-cylinder unit via the suction pipe, and the refrigerant compressed therein being guided along a pressure section, which is formed by a pressure pipe, which is manufactured from plastic, and a connection pipe, which adjoins the pressure pipe and is manufactured from metal, through the interior of the compressor housing and then to the exterior of the compressor housing. It is provided according to the invention that the pressure pipe is connected to form a seal to the connection pipe, which is manufactured from metal, using a sleeve-shaped connector, which is manufactured from plastic and situated between the pressure pipe and the connection pipe, the connection pipe having an at least sectionally constricted end section facing toward the pressure pipe, which secures the connector situated inside the connection pipe in its axial location. - By providing a sleeve-shaped elastic connector, which is adaptable according to the particular geometries of pressure pipe and connection pipe, between the pressure pipe and the connection pipe, the differing coefficient of thermal expansion of the pressure pipe manufactured from plastic from the connection pipe manufactured from metal can be ideally compensated for and leaks of the pressure section can thus be prevented.
- The design of the flow cross-section of the pressure section formed by pressure pipe and connection pipe can now be performed as desired, so that cross-section reductions in the flow direction of the refrigerant, as would occur if the pressure pipe was plugged onto the connection pipe, for example, are avoidable in future. The continuous flow of the refrigerant exiting from the piston-cylinder unit can thus be preserved.
- For this reason, it is preferably provided that an opening cross-section of the connector, which adjoins the end area of the pressure pipe and is delimited by a connector inner surface, is greater than or equal to a flow cross-section of the pressure pipe delimited by the pressure pipe inner surface.
- According to a preferred embodiment of the pressure pipe attachment according to the invention, it is provided that an outer side of the pressure pipe is jacketed to form a seal by the connector, the connector having a sealing connection to the connection pipe. In this way, a reliably sealing pressure section which is to be assembled in the automated method can be produced.
- In a further preferred embodiment of the invention, the sealing connection between the connector and the connection pipe is produced by a seal element situated between the connector and the connection pipe. This seal element is preferably an O-ring, which is held in a groove provided on an outer side of the connector. In this way, a simple and cost-effective seal is made possible between the connector and the connection pipe.
- Of course, additionally or alternatively to providing the seal element, other seal capabilities may be provided between the connector and the connection pipe, such as a seal using adhesive or by providing a press fit between the connector and the connection pipe.
- In a further preferred embodiment variant of the invention, it is provided that the inner surface of the connector is implemented as stepped, a first inner surface section, which jackets the pressure pipe, and a second inner surface section, which adjoins an end area of the pressure pipe, preferably at a front side of the pressure pipe, and is essentially aligned with an inner surface of the pressure pipe or lies outside of it, of the connector are provided. Through the stepped embodiment of the connector inner surface, a more secure hold and precise positioning of the pressure pipe end area in the connector are made possible. In that the second inner surface section, which follows the front side of the pressure pipe, of the connector aligns with the pressure pipe inner surface or (viewed in relation to the pipe axis) lies outside the pressure pipe inner surface, a continuous flow of the refrigerant exiting from the piston-cylinder unit is encouraged.
- In order to also allow a reliably sealing pressure section at the transition point from the pressure pipe to the connector, the connector can be connected to the pressure pipe by gluing, welding, or extrusion coating.
- In a particularly preferred embodiment, the connector is fastened on the pressure pipe using laser welding technology. For this purpose, at least the section of the connector adjoining the pressure pipe is transparent to at least infrared wavelengths in the range between 800 and 960 nm. In that the connector is thus implemented as at least regionally translucent, an infrared laser welding device provided for this purpose can radiate through the jacket of the connector and achieve a suitable welding temperature in the contact area between the pressure pipe outer side and the connector inner surface in this way. A connection of the pressure pipe to the connector of this type using infrared laser welding technology has an ultra-reliable sealing effect and allows economic manufacturing.
- In a preferred embodiment of the invention, the connection pipe is crimped to the connector. For this purpose, the outer side of the connector has a complementary geometry prepared for crimping with the connection pipe, preferably in the form of a concave recess. After completed insertion of the connector with pressure pipe into the connection pipe, the connection pipe is reshaped using a crimping tool, so that a jacket section of the connection pipe presses against the concave recess and thus causes axial fixing of the connector held in the connection pipe.
- The connector is produced from an elastomeric plastic in a preferred embodiment. Connectors manufactured from an elastomeric material may deform elastically under tension, pressure, or bending strain, so that greater robustness of the pressure section in relation to mechanically or thermally related force actions is achieved.
- To increase the stability of the pressure section exiting from the compressor housing, the connection pipe is fastened, preferably welded, on a wall of the compressor housing at the height of an end section of the pressure pipe which is held in the assembly location in the connection pipe or in the connector.
- The invention is described in greater detail hereafter on the basis of exemplary embodiments. In the figures:
-
FIG. 1 shows a perspective illustration of a refrigerant compressor having a compressor housing and an incoming suction pipe and an outgoing pressure section -
FIG. 2 shows a schematic illustration of the interior of the refrigerant compressor according toFIG. 1 , only the parts relevant for the invention being shown for better clarity -
FIG. 3 shows an attachment according to the invention of a pressure pipe to a connection pipe using a plastic connector in a detail sectional view -
FIG. 4 shows an alternative embodiment of the pressure pipe attachment according to the invention in a detail sectional view -
FIG. 5 shows an alternative embodiment of the pressure pipe connection according to the invention in a detail sectional view -
FIG. 6 shows an alternative embodiment of the pressure pipe connection according to the invention having a crimped connection pipe in a detail sectional view -
FIG. 7 shows an alternative embodiment of the pressure pipe connection according to the invention having a crimped connection pipe in a detail sectional view -
FIG. 8 shows an alternative embodiment of the pressure pipe connection according to the invention having a crimped connection pipe in a detail sectional view -
FIG. 1 shows a refrigerant compressor in a perspective view having acompressor housing 1 with asuction pipe 2 and apressure section pressure pipe 3 and aconnection pipe 6. - The
suction pipe 2 leads into theinterior 8 of thecompressor housing 1 and guides a refrigerant coming from a vaporizer (not shown) to a piston-cylinder unit 4 installed on the base plate 16 in thecompressor housing 1, in order to compress the refrigerant expanded in the vaporizer again. The compressed refrigerant is guided away from the piston-cylinder unit 4 again and/or guided out of theinterior 8 of thecompressor housing 1 via thepressure section 3, 6 (see alsoFIG. 2 ). - The section of the
pressure section compressor housing 1, namely thepressure pipe 3 connected to the piston-cylinder unit 4, is shown inFIG. 2 . This section is also designated as a “serpentine”. Theend area 3 c of thepressure pipe 3 is provided for connection to aconnection pipe 6 situated outside thecompressor housing 1, which is also part of thepressure section cylinder unit 4 than thepressure pipe 3. - According to
FIG. 2 , thepressure section pressure sound damper 18, which can also be situated outside thecompressor housing 1, however. - In order to reduce heat being of the interior of the
compressor housing 1 by the refrigerant guided in thepressure pipe 3 and damp vibrations, thepressure pipe 3—as already known from the prior art—is manufactured from plastic, such as a thermoplastic, duroplastic, or elastomeric plastic. - In contrast, the
connection pipe 6 to be attached to thepressure pipe 3 is manufactured from metal. Theconnection pipe 6 preferably comprises copper, a copper alloy, or steel, but it can also be implemented from other metal materials and have optional jacket or internal coatings. - Because the material copper has a coefficient of expansion approximately four times as high as plastic and operating temperatures of up to 120° C. result in the interior of the
compressor housing 1, special requirements are placed on a connection of thepressure pipe 3 and theconnection pipe 6 to ensure the tightness of thepressure section - According to the invention, it is provided that the
pressure pipe 3 is connected using a sleeve-shapedconnector 5, which is manufactured from plastic and is situated between thepressure pipe 3 and theconnection pipe 6, to theconnection pipe 6, which is manufactured from metal. - It is to be noted that the
pressure pipe 3 does not necessarily have to be located inside and theconnection pipe 6 does not necessarily have to be located outside thecompressor housing 1. The connection area betweenpressure pipe 3 andconnection pipe 6 and/or the attachment according to the invention shown in the figures using aconnector 5 can be in an arbitrary area of thepressure section compressor housing 1. - The
connector 5 according to the invention can be manufactured, for example, from polyamide (PA), polyethylene (PE), polypropylene (PP), syntactic polystyrene (SPS), or polytetrafluoroethylene (PTFE). Theconnector 5 is preferably produced from a thermoplastic, in order to allow good welding capability of theconnector 5 to thepressure pipe 3. Aconnector 5 which is pressed or glued into theconnection pipe 6 and manufactured from thermoplastic can also move with theconnection pipe 6 in case of heating thereof and thus allow a better seat of theconnector 5 in theconnection pipe 6. -
FIG. 3 shows a first embodiment variant of the pressure pipe attachment according to the invention. In this case, theconnection pipe 6 coming from theexterior 9 and/or leading to the vaporizer protrudes somewhat into theinterior 8 of thecompressor housing 1, which is provided with a through opening 17, and is connected, e.g., welded on anouter side 6 b to thecompressor housing 1. - Furthermore, according to the invention, the
connector 5 is inserted, preferably pressed into theconnection pipe 6 and is secured thereby in its axial location, in that theconnection pipe 6 has aconstricted end section 6 c facing toward thepressure pipe 3, which encompasses afront side 5 c of theconnector 5 situated inside theconnection pipe 6 at least on one point of its circumference and/or secures it against axial shifting. According toFIG. 3 , theend section 6 c of theconnection pipe 6 is bent over and/or compressed in the direction of anouter side 3 b of thepressure pipe 3. - The
outer side 3 b of thepressure pipe 3 is jacketed to form a seal by aninner surface 5 a of theconnector 5. In the present exemplary embodiment, theinner surface connector 5 is implemented as stepped, a firstinner surface section 5 a, which jackets thepressure pipe 3, and a secondinner surface section 5 a′, which adjoins theend area 3 c of thepressure pipe 3 and/or its front side, of theconnector 5 being provided. - In order not to obstruct the continuous flow of the refrigerant, which exits from the piston-cylinder unit and flows in the
flow direction 15 from thepressure pipe 3 to theconnection pipe 6, aflow cross-section 11 of theconnector 5, which adjoins theend area 3 c of thepressure pipe 3 and is defined by the secondinner surface section 5 a′, is greater than or equal to aflow cross-section 10 of thepressure pipe 3 defined by an inner surface 3 a of thepressure pipe 3. In the exemplary embodiment according toFIG. 3 , the secondinner surface section 5 a′ of theconnector 5 essentially aligns with the inner surface 3 a of thepressure pipe 3 and/or lies just outside the inner surface 3 a of the pressure pipe 3 (viewed in relation to the central axis). - It is obvious in
FIG. 3 that the refrigerant flowing in theflow direction 15 from thepressure pipe 3 to theconnection pipe 6 and/or into the exterior of thecompressor housing 1 is exclusively guided inpipe sections flow cross-section flow cross-section 10 formed by thepressure pipe 3, then theflow cross-section 11, which is formed by the secondinner surface section 5 a′ of theconnector 5 and is slightly enlarged in relation to theflow cross-section 10 of thepressure pipe 3, and finally theflow cross-section 12, which is formed by theconnection pipe 6 and is in turn expanded in relation to theflow cross-section 11 of theconnector 5, the refrigerant does not have to pass a narrow point, but rather can expand unobstructed in theflow direction 15. - The
connector 5 is attached on thepressure pipe 3 using sealing connection technologies, such as gluing, welding, pressing, or extrusion coating. - In a particularly preferred type of connection, the
connector 5 is fastened on thepressure pipe 3 using infrared laser welding technology. In this case, at least the section of theconnector 5 adjoining thepressure pipe 3 is implemented as translucent and/or transparent at least to infrared wavelengths in the range between 800 and 960 nm, in order to radiate through the jacket of thepressure pipe 3 using a suitable infrared laser welding device and achieve a welding temperature in the contact area between theouter side 3 b of thepressure pipe 3 and theinner surface 5 a of theconnector 5. Thepressure pipe 3, in contrast, is manufactured from black or dark plastic, in order to allow optimum absorption of the energy emitted by the infrared laser welding device. - The
connector 5 which is connected to thepressure pipe 3 to form a seal also has a sealing connection to theconnection pipe 6. This sealing connection is produced in the exemplary embodiment shown by aseal element 7 situated between theconnector 5 and theconnection pipe 6. - In the exemplary embodiment according to
FIG. 3 , theseal element 7 is an O-ring, which is held in agroove 13 provided on the outer side 5 b of theconnector 5 and whose external diameter is at least greater than the internal diameter of theconnection pipe 6 and/or the clearance of theflow cross-section 12. - The O-ring or the
seal element 7 has a lenticular cross-section inFIG. 3 . Alternatively thereto, the use of round, rectangular, or rhomboid O-rings 7 is also possible (seeFIGS. 4 and 5 ). According toFIG. 4 , an O-ring 7 is laid in thegroove 13 of theconnector 5, whose cross-section has an essentially square shape, the sides of the cross-sectional square each being implemented as concave, so that two sealing contact lines result both toward the inner surface 6 a of theconnection pipe 6 and also toward theouter side 5 a of theconnector 5. Such a design of theseal element 7 allows an even better guarantee of the tightness between theconnection pipe 6 and theconnector 5. - In order to achieve a sealing connection of the
connector 5 to theconnection pipe 6, however, a specially implementedconnector 5, which is manufactured from an elastomeric material, for example, could also be used. - It is obvious that an alternative or additional possible seal between the
connector 5 and theconnection pipe 6 is possible, for example, by applying an adhesive to the connector outer side 5 b and/or the connection pipeinner surface 6 b or by providing a press fit between the connector outer side 5 b and the connection pipeinner surface 6 b. It is possible in particular for this purpose to achieve a form fit by hooking theconnector 5 and theconnection pipe 6 in one another. -
FIG. 6 shows an alternative embodiment of the invention, theconnection pipe 6 being crimped to theconnector 5. For this purpose, the outer side 5 b of theconnector 5 has a complementary geometry, which is prepared for crimping with theconnection pipe 6, in the form of aconcave recess 14. After completed insertion and/or pressing of theconnector 5 withpressure pipe 3 into theconnection pipe 6, theconnection pipe 6 is crimped at least at one point of its circumference using a suitable device, so that ajacket section 6 d of theconnection pipe 6 presses against theconcave recess 14 and thus causes axial fixing of theconnector 5 held in theconnection pipe 6. - As
FIG. 6 shows, theconcave recess 14 of theconnector 5 and/or the crimpedjacket section 6 d of theconnection pipe 6 are situated in a position which encloses theend area 3 c of thepressure pipe 3 held in theconnector 5. Through the described crimping procedure, the area of theconnector 5 located below thejacket section 6 d of theconnection pipe 6 is pressed still more strongly against thepressure pipe 3 and the sealing effect betweenconnector 5 andpressure pipe 3 is increased further. Such a configuration would prove advantageous in particular in the case ofconnectors 5 in an elastomeric embodiment, because providing aseparate seal element 7 could be dispensed with. - For reasons of stability, the
connection pipe 6, as already shown inFIG. 1 , is fastened on the wall of thecompressor housing 1 at the height of theend section 3 c of thepressure pipe 3 held in theconnection pipe 6 and/or in theconnector 5. - In the case of a crimped embodiment of the
pressure section seal elements 7 may also be used having arbitrary cross-sectional geometry and in arbitrary numbers (see alsoFIGS. 7 and 8 ) or, as already noted, may also be dispensed with, because a sufficient sealing effect to theconnection pipe 6 is already achieved by aconnector 5 having a sealing geometry.
Claims (12)
1. A refrigerant compressor, comprising a hermetically sealed compressor housing (1), in whose interior (8) a piston-cylinder unit (4) compressing a refrigerant operates, which sucks in refrigerant from outside (9) the compressor housing (1) via a suction pipe (2) and expels the refrigerant under compression via a pressure section (3, 6), formed from a pressure pipe (3) manufactured from plastic and a connection pipe (6) manufactured from metal in the direction of a condenser situated outside (9) the compressor housing (1), wherein the pressure pipe (3) is connected to form a seal to the connection pipe (6) using a sleeve-shaped connector (5), which is manufactured from plastic and is situated between the pressure pipe (3) and the connection pipe (6), the connection pipe (6) having an at least sectionally constricted end section (6 c), facing toward the pressure pipe (3), which secures the connector (5) situated inside the connection pipe (6) in its axial location.
2. The refrigerant compressor according to claim 1 , wherein a sealing connection between the connector (5) and the connection pipe (6) is produced by a seal element (7) situated between the connector (5) and the connection pipe (6).
3. The refrigerant compressor according to claim 3 , wherein the seal element (7) is an O-ring, which is preferably held in a groove (13) provided on an outer side (5 b) of the connector (5).
4. The refrigerant compressor according to claim 1 , wherein a flow cross-section (11) of the connector (5), which adjoins an end area (3 c) of the pressure pipe (3) and is delimited by an inner surface (5 a, 5 a′), is greater than or equal to a flow cross-section (10) of the pressure pipe (3), which is delimited by an inner surface (3 a).
5. The refrigerant compressor according to claim 1 , wherein an outer side (3 b) of the pressure pipe (3) is jacketed by the connector (5) to form a seal.
6. The refrigerant compressor according to claim 4 , wherein the inner surface (5 a, 5 a′) of the connector (5) is implemented as stepped, a first inner surface section (5 a), which jackets the pressure pipe (3), and a second inner surface section (5 a′), which adjoins the end area (3 c) of the pressure pipe (3), preferably a front side of the pressure pipe (3), and is essentially aligned with an inner surface (3 a) of the pressure pipe (3) or—viewed relative to the pipe axis—lies outside the pressure pipe inner surface (3 a), of the connector (5) are provided.
7. The refrigerant compressor according to claim 1 , wherein the connector (5) is connected to the pressure pipe (3) by gluing, welding, or extrusion coating.
8. The refrigerant compressor according to claim 1 , wherein the connector (5) is fastened on the pressure pipe (3) using laser welding, at least the section of the connector (5) adjoining the pressure pipe (3) being transparent at least to infrared wavelengths in the range between 800 and 960 nm.
9. The refrigerant compressor according to claim 1 , wherein the connector (5) is pressed into the connection pipe (6).
10. The refrigerant compressor according to claim 1 , wherein an outer side (5 b) of the connector (5) has a complementary geometry which is prepared for crimping with the connection pipe (6), preferably in the form of a concave recess (14).
11. The refrigerant compressor according to claim 1 , wherein the connector (5) is produced from an elastomeric plastic.
12. The refrigerant compressor according to claim 1 , wherein the connection pipe (6) is fastened, preferably welded, to a wall of the compressor housing (1) at the height of the end section (3 c) of the pressure pipe (3) held in the assembly location in the connection pipe (6) and/or in the connector (5).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0060407U AT10136U1 (en) | 2007-10-05 | 2007-10-05 | REFRIGERANT COMPRESSOR |
ATGM604/2007 | 2007-10-05 | ||
PCT/EP2008/062405 WO2009047095A1 (en) | 2007-10-05 | 2008-09-18 | Coolant compressor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/062405 Continuation WO2009047095A1 (en) | 2007-10-05 | 2008-09-18 | Coolant compressor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100226805A1 true US20100226805A1 (en) | 2010-09-09 |
Family
ID=39616344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/798,398 Abandoned US20100226805A1 (en) | 2007-10-05 | 2010-04-02 | Refrigerant compressor |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100226805A1 (en) |
EP (1) | EP2207962B1 (en) |
CN (1) | CN101883923A (en) |
AT (1) | AT10136U1 (en) |
WO (1) | WO2009047095A1 (en) |
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WO2014053040A1 (en) | 2012-10-03 | 2014-04-10 | Whirlpool S.A. | Thermal insulation system for the discharge of gas in a refrigeration compressor |
US9121276B2 (en) | 2012-07-23 | 2015-09-01 | Emerson Climate Technologies, Inc. | Injection molded seals for compressors |
US9605677B2 (en) | 2012-07-23 | 2017-03-28 | Emerson Climate Technologies, Inc. | Anti-wear coatings for scroll compressor wear surfaces |
KR20170124893A (en) * | 2016-05-03 | 2017-11-13 | 엘지전자 주식회사 | linear compressor |
EP3343035A1 (en) * | 2016-12-28 | 2018-07-04 | LG Electronics Inc. | Reciprocating compressor |
US10428811B2 (en) | 2014-11-10 | 2019-10-01 | Lg Electronics Inc. | Reciprocating compressor and method for assembling the same |
US10760564B2 (en) | 2016-12-28 | 2020-09-01 | Lg Electronics Inc. | Reciprocating compressor having a connector |
CN114508475A (en) * | 2022-02-14 | 2022-05-17 | 广州万宝集团压缩机有限公司 | Interior exhaust structure, compressor and attemperator |
US20220381238A1 (en) * | 2019-11-01 | 2022-12-01 | Leggett & Platt Canada Co. | Pump noise attenuator and method thereof |
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JP5454423B2 (en) * | 2010-03-29 | 2014-03-26 | 株式会社豊田自動織機 | Electric compressor |
BR102016013772B1 (en) * | 2016-06-14 | 2021-07-13 | Embraco Industria De Compressores E Soluqoes Em Refrigeraqao Ltda. | IMPROVEMENTS INTRODUCED IN A SYSTEM FOR CONNECTING REFRIGERANT FLUID DISCHARGE PIPES IN HERMETIC COMPRESSOR CYLINDER CAPS, AND CORRESPONDING EXECUTION PROCESS |
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BR102018015458B1 (en) | 2018-07-27 | 2021-12-21 | Whirlpool S.A. | FLUID CONDUCTOR TUBE |
CN110425279B (en) * | 2019-08-06 | 2021-04-27 | 北京卫星环境工程研究所 | Secondary sealing ring structure for high-power two-stage G-M refrigerator |
KR20210125669A (en) * | 2020-04-09 | 2021-10-19 | 현대자동차주식회사 | Piping system for air conditioner |
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Also Published As
Publication number | Publication date |
---|---|
CN101883923A (en) | 2010-11-10 |
EP2207962B1 (en) | 2015-04-29 |
AT10136U1 (en) | 2008-09-15 |
WO2009047095A1 (en) | 2009-04-16 |
EP2207962A1 (en) | 2010-07-21 |
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Owner name: ACC AUSTRIA GMBH, AUSTRIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KULMER, HERWIG;REEL/FRAME:024420/0463 Effective date: 20100428 |
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