JP2009013996A - Compressor with built-in oil separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor with a built-in oil separator, formed by utilizing a necessary rib part in design to simplify structure and reduce weight of the whole compressor. <P>SOLUTION: In the compressor with the built-in centrifugal oil separator, the oil separator is formed by combinational structure of a first member with a second member constituting the compressor, without the need of machining between the first member and the second member, and by utilizing boss ribs extended between boss parts disposed to the first member and the second member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a compressor with a built-in oil separator, and in particular, relates to a compressor with a built-in oil separator that simplifies a mechanism with a built-in oil separator, reduces the number of parts, facilitates assembly, and reduces costs.

  2. Description of the Related Art Conventionally, as a compressor incorporated in a refrigeration system of a vehicle air conditioner, for example, a compressor with a built-in oil separator in which a centrifugal oil separator is built in a compressor is known (for example, Patent Document 1). In the conventional compressor with a built-in oil separator, as shown in FIG. 6, for example, a scroll type compressor provided with a compression mechanism 103 composed of a fixed spiral body 101 and a movable spiral body 102 is compressed by the compression mechanism 103. A centrifugal oil separator 107 is incorporated in a rear casing 106 that forms a discharge chamber 105 into which a gas (for example, refrigerant gas) is introduced through a discharge hole 104. In such an oil separator 107, a cylindrical cylinder (oil separation chamber 108) is provided in the casing 106 as an oil separation portion, a separation pipe 109 is inserted or press-fitted on the shaft, and the upper end side is a snap ring 110. The structure that is fixed or locked by is adopted. Since the oil separation part is installed only in the casing 106 and the oil separation part is formed by machining, the seal bolt 111 is necessary to maintain the internal pressure. Further, the discharge port 112 connected to the outside of the compressor (external piping) is communicated with a space between the upper part of the separation pipe 109 and the lower end of the seal bolt 111.

The gas compressed by the compression mechanism 103 is discharged into the discharge chamber 105 through the discharge hole 104 of the fixed spiral body, and the gas containing oil in the discharge chamber 105 is introduced into the oil separation chamber 108 through the communication hole 113. The introduced gas rotates around the separation pipe 109 and is separated into gas and oil using centrifugal force. The separated gas passes through the inside of the separation pipe 109, is discharged from the discharge port 112, and the oil separated by the centrifugal force is stored in the oil storage chamber 115 below the lower hole 114 (oil return hole). The oil accumulated in the oil storage chamber 115 is returned to the suction chamber 117 through the orifice 116.
JP-A-11-93880

The structure of the conventional oil separator as described above has the following problems.
The oil separation chamber 108 (cylinder part), the lower hole 114 (oil return hole), the insertion or press-fitting part of the separation pipe 109, the threaded part for the seal bolt 111, etc. all need to be formed by machining. Therefore, productivity is low and costs are high.

  Further, parts such as the separation pipe 109 and the seal bolt 111 are necessary, and the total length of the oil separation chamber 108 becomes relatively long, so that the workability of this part is poor. Further, since the oil separation chamber 108 (cylinder portion) has a cylindrical shape, a space for installing the oil separation portion is limited, and the overall length of the casing is also increased. Therefore, productivity is poor and layout flexibility is small. Moreover, when the casing full length becomes long, the weight reduction of the whole compressor becomes difficult.

  Moreover, since parts such as the separation pipe 109, the snap ring 110, and the seal bolt 111 are necessary and the number of parts is large, the time required for assembly is long. Further, defects are likely to occur in the press-fitting process of the separation pipe 109 and the tightening process of the seal bolt 111. For this reason, there are problems that productivity is low and costs are high in both manufacturing and assembly.

  Further, the compressed gas after oil separation goes out of the compressor from the discharge port 112 communicating with the space between the lower end of the seal bolt 111 and the upper end of the separation pipe 109, but there is no flexibility in the layout of the separation mechanism section. Therefore, the position of the discharge port 112 is also restricted. Therefore, there is a problem that the position of the discharge port 112 is less flexible, and the design of the compressor itself and the connection structure with the outside are restricted.

  Therefore, the object of the present invention is to pay attention to the above-mentioned problems and simplify the structure of the oil separation part, so that the number of parts of the compressor with a built-in oil separator can be greatly reduced, productivity can be improved, and cost can be reduced. In addition, the design freedom of the discharge port position is ensured, and the oil separator is formed by using the rib part necessary for design and strength, thereby further simplifying the structure and reducing the overall weight of the compressor. An object is to provide a compressor with a built-in oil separator.

  In order to solve the above problems, an oil separator built-in compressor according to the present invention includes a centrifugal oil separator, wherein the oil separator includes a first member and a second member constituting the compressor. It is formed between the first member and the second member by a mating structure with the member, and the first member and the second member pass through a fixing means for the first member and the second member. It has a boss part around the hole and a boss rib extending between the boss parts, and the oil separator is formed using the boss rib.

  More specifically, for example, the oil separator includes at least a separation chamber that separates the oil component and the gas component of the oil-containing gas introduced from the discharge chamber using centrifugal force, the separation chamber, and the discharge chamber. And a lower hole for leading the oil separated in the separation chamber to the oil storage chamber located below the separation chamber, and the communication hole is formed in the structure formed in the boss rib. These are formed between the first member and the second member by a combined structure of the first member and the second member. The boss rib is originally required in terms of design and strength, and is provided even when the oil separator built-in structure is not employed. In the present invention, an oil separator is formed using this boss rib.

  In such a compressor with a built-in oil separator according to the present invention, the cylinder portion (separation chamber), the communication hole portion, and the lower hole portion of the oil separation mechanism serve as the first member and the second member constituting the compressor. Since it is formed by the mating structure to be combined, these portions can be formed without machining, productivity is greatly improved, and cost can be reduced. In addition, the separation pipe in the conventional structure can be abolished, its fixing and locking mechanism, and also the seal bolt can be abolished, so the structure of the whole separation mechanism can be simplified and the number of parts is greatly reduced. Time can be shortened, assembly can be facilitated, and costs can be reduced. Further, as a result of the elimination of seal bolts and the like, the total length of the oil separation portion can be shortened and downsized, and the entire compressor can be reduced in size and weight. Since such a built-in oil separator is formed by using boss ribs extending between the boss portions that have been conventionally provided in design and strength, a special wall or the like is added for forming the oil separator. Even if it is not necessary or only a small amount is added, the structure can be further simplified, and the entire compressor can be reduced in size and weight.

  Further, in the present invention, a gas passage is provided between the oil separator and a discharge port connected to the outside of the compressor, and the gas passage also includes the first member and the second member. A structure in which the gas passage is formed between the first member and the second member by using the boss rib can be adopted. A discharge port may be communicated with the gas passage, whereby the gas separated from the oil is smoothly discharged from the discharge port to the outside. Since such a gas passage is also formed by using the boss rib, the gas passage separated from the oil by the oil separator can be efficiently and easily formed in a desired form.

  As described above, in the present invention, the oil separator, in particular, the separation chamber is formed by using the boss rib. The separation chamber is formed on the outer side in the compressor radial direction of the boss rib, in particular, on the outer side in the compressor radial direction of the boss rib. If it is formed so as to extend along the boss ribs, it is possible to easily form a separation chamber having a desired form.

  In the compressor with a built-in oil separator according to the present invention, the oil separator is basically configured as a centrifugal oil separator. However, since the number of parts is small and there is no machined part, the degree of freedom of the shape of the separation chamber is small. Is kept extremely high. Therefore, the separation chamber can be formed in a cylindrical shape in which the bus bar portion is linearly extended as in the conventional case, or a cylindrical shape in which the bus bar portion is curved (formally a donut shape (forms a part of a donut shape). It can also be formed in a separation chamber). In particular, by making this separation chamber into a cylindrical shape having a curvature (doughnut shape) or the like, the degree of freedom in layout is greatly increased, and the entire compressor can be made compact. Since the boss rib is also often formed in a curved shape, an oil separator having a desired form can be easily configured by forming a separation chamber along the boss rib.

  In addition, regarding the cross-sectional shape in the cylindrical shape, a substantially perfect circular shape is preferable. However, due to the configuration structure of the first member and the second member, there are some steps on the inner surface of the cylindrical shape. A difference in curvature may occur between the arcs in the cylindrical cross section of the first member and the second member forming the cylindrical inner surface. Further, when forming the cylindrical inner surface, a difference in the circumferential length of the inner surface may occur between the first member and the second member. Further, there may be a difference between the depths of the arc-shaped grooves in the cylindrical cross section of the first member and the second member forming the cylindrical inner surface.

  In addition, in order to avoid a decrease in separation capacity due to the abolition of the separation pipe, by changing the blowing direction of the compressed gas blown from the communication hole to the oil separation chamber with respect to the conventional structure, Separation capability is fully feasible. For example, by adopting a structure in which the opening direction of the communication hole to the separation chamber is directed to the oil storage chamber side, the oil is introduced to the oil storage chamber side while effectively acting centrifugal force for separation on the oil. Can be efficiently separated.

  A plurality of communication holes to the separation chamber can be provided. In the case of providing a plurality, it is possible to adopt a structure in which the opening direction of the plurality of communication holes to the separation chamber is directed in the same direction. In this way, even when the amount of gas blown into the oil separation chamber is relatively large, the gas blowing through each communication hole can be optimized, and the separated oil can be efficiently guided to the oil storage chamber. Is possible. Further, a structure in which the opening direction to the separation chamber is changed for each of the plurality of communication holes can also be adopted as a preferable form. In this way, the angle of the direction of the gas blown into the oil separation chamber can be changed for each communication hole, and the gas can be blown out in accordance with the shape of the oil separation chamber, so that efficient separation can be achieved. In addition, the oil separated efficiently can be guided to the oil storage chamber.

  Further, a structure in which a stepped portion or a dam portion is provided in the gas passage may be employed. Thus, by devising the shape of the gas passage between the separation chamber and the discharge port, the outflow of oil from the discharge port can be reduced.

  Further, a structure in which a second discharge chamber (a chamber immediately before the discharge port, which is different from the discharge chamber) is formed between the separation chamber and the discharge port may be employed. In such a structure, the second discharge chamber only needs to communicate with the discharge port. Therefore, by appropriately setting the formation range and the shape of the second discharge chamber, the degree of freedom of the discharge port installation position is greatly increased. Will be increased.

  Further, in the present invention, the lower hole between the separation chamber and the oil storage chamber is located downstream of the oil outlet direction, and at least one of the boss portion, the first member, and the second member. A structure is employed in which a rib that connects the boss portion and the outer peripheral wall is provided at a position between the outer peripheral wall of the member while maintaining a communication state between the separation chamber and the oil storage chamber. be able to. Such ribs can be used to form the lower side of the separation chamber and can be used to form a partition between the separation chamber and the oil storage chamber. By using such ribs, both the oil separation and the oil storage chamber can be used. Can be easily formed into a desired form.

  In particular, the rib connecting the boss portion and the outer peripheral wall is located between the separation chamber and the oil storage chamber, so that a desired form of passage from the separation chamber to the oil storage chamber can be made using this rib portion. It is possible to form. Then, if the passage portion formed by using the rib portion is configured in a throttle structure having an appropriate resistance, or if a throttle having an appropriate resistance is provided in the passage portion, the passage portion is once stored in the oil storage chamber. Thus, it is possible to prevent the oil from flowing out again to the separation chamber side, and to more reliably exhibit the oil separator function.

  Such an oil separator built-in structure in the present invention can be applied to virtually any type of compressor, but is particularly suitable for a scroll type compressor. In the case of a scroll compressor, for example, one of the first member and the second member may be a fixed spiral member and the other may be a compressor casing.

Thus, according to the compressor with a built-in oil separator according to the present invention, the first member (for example, the fixed spiral member constituting member) is formed without machining the cylinder, the communication hole, the separation pipe holding portion, the lower hole, and the like in the conventional structure. ) And the second member (for example, a casing) can be used to easily form an oil separator using a boss rib, and a structure that eliminates the conventional separation pipe can be obtained as follows. It is done.
(1) It is possible to improve processing productivity and reduce costs by eliminating the machining of the oil separator.
(2) By reducing the number of parts, it is possible to reduce the cost of individual parts and to improve the assemblability.
(3) The assembly process can be greatly simplified, the separation pipe press-fitting and seal bolt tightening processes, which have become necks in the past, are eliminated, the occurrence of defects in these conventional processes is eliminated, and the defect rate in the assembly process is greatly reduced. it can.
(4) The degree of freedom of the discharge port position can be greatly increased, whereby the layout of the discharge port, and thus the layout of the entire compressor incorporated in the system can be greatly improved.
(5) Since the oil separator is formed by using the boss rib which is required in terms of strength in design, it is not necessary to form a special wall or the like for forming the oil separator, or even in the case of forming it. The structure of the compressor with a built-in oil separator can be simplified, and the entire compressor can be reduced in size, weight, and cost can be reduced.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a compressor 1 with a built-in oil separator according to an embodiment of the present invention, and in particular, in a portion including a discharge chamber 2, a combined structure is formed to form the oil separator 3 in the present invention. The state where the fixed spiral body constituting member 4 as the first member and the casing 5 as the second member are opened is shown. The compressor 1 is composed of, for example, a scroll compressor including a compression mechanism 103 including a fixed spiral body 101 and a movable spiral body 102 as shown in FIG. Gas (for example, refrigerant gas) compressed by the compression mechanism 103 is introduced into the discharge chamber 2 via the discharge hole 104 (see FIG. 6).

  An oil separator 3 is built in an appropriate position around the discharge chamber 2. As shown in FIGS. 2 and 3, the oil separator 3 is formed by a combined structure of a fixed spiral member 4 as a first member and a casing 5 as a second member. In particular, the oil separator 3 includes boss ribs 22a and 22b extending between boss portions 21a and 21b formed around a hole through which a fixing means (for example, a bolt) for fixing the fixed spiral member 4 and the casing 5 is inserted. However, the boss ribs 22a and 22b are partly formed. This oil separator 3 has a separation chamber 6 having a cylinder structure that separates oil from compressed gas by centrifugal force. In this embodiment, the separation chamber 6 is formed by boss ribs 22a and 22b formed in a curved shape. Along with this, a cylindrical shape (a cylindrical shape forming a part of a donut shape) in which the busbar portion is curved is formed. A communication hole 7 is provided between the separation chamber 6 and the discharge chamber 2 to blow out gas containing oil from the discharge chamber 2 into the separation chamber 6. In the present embodiment, a plurality of (two) communication holes 7 are provided. Is provided. Further, in the present embodiment, these communication holes 7 are formed at the installation site of the boss ribs 22 a provided in the casing 5. As shown in FIG. 2, oil-containing gas (arrow) is introduced into the separation chamber 6 from the communication hole 7 at a position eccentric from the cylindrical central axis of the separation chamber 6, and along the inner surface of the separation chamber 6. A flow is formed and the oil in the gas is separated by centrifugal force. As shown in FIG. 4, the two communication holes 7 have an opening direction toward the separation chamber 6 directed toward the oil storage chamber 8 formed below the separation chamber 6. In the embodiment shown in FIG. 1, As shown in FIG. 4B, the opening direction to the separation chamber 6, that is, the angle of the extending direction of the communication hole 7 is changed for each communication hole 7. The angle is set so that the communication hole 7 located on the lower side faces the oil storage chamber 8 side. When a plurality of communication holes 7 are provided in this way, as shown in FIG. 4A, the opening directions of the respective communication holes 7 to the separation chamber 6 are directed in the same direction, and the opening directions of all the communication holes 7 are set to the same direction. It can also be aligned in the optimal direction. The separated oil is stored in the oil storage chamber 8 through a lower hole 9 provided at the lower end of the separation chamber 6. In the present embodiment, the lower hole 9 is formed at a position that is eccentric from the center of the cylindrical shape of the separation chamber 6 in this embodiment, but may be formed at a position that is not eccentric. The oil stored in the oil storage chamber 8 is returned to the suction chamber side through the orifice 10.

  The gas separated in the separation chamber 6 is discharged from the discharge port 12 to the outside of the compressor through the gas passage 11 communicated with the upper end of the separation chamber 6. In this embodiment, as shown in FIG. 5, a step portion 13 (or a weir portion) is provided in the gas passage 11, and due to the presence of the step portion 13, the flow in the gas passage 11 is bent, Oil is prevented from flowing out from the discharge port 12 to the outside.

  In this embodiment, a second discharge chamber 14 that is completely separate from the discharge chamber 2 is formed between the separation chamber 6 and the discharge port 12 (in the present embodiment, at a position after the step portion 13). ing. The discharge port 12 communicates with the second discharge chamber 14, but the second discharge chamber 14 is formed in a chamber having a length in the circumferential direction of the compressor as shown in FIG. The installable position can be freely set within the range corresponding to the extension range of the second discharge chamber 14 (discharge port range 15).

  Furthermore, in this embodiment, at the position downstream of the oil outlet direction of the lower hole 9 between the separation chamber 6 of the oil separator 3 and the lower oil storage chamber 8 formed by using a part of the boss ribs 22a and 22b. In a state where the communication state between the separation chamber 6 and the oil storage chamber 8 is maintained at a position between the boss portions 21a, 21b and the outer peripheral walls 23a, 23b of the casing 5 and the fixed spiral body constituting member 4. Ribs 24a and 24b connecting the boss portions 21a and 21b and the outer peripheral walls 23a and 23b are provided. The whole or a part of the passage formed by the ribs 24a and 24b is configured as a throttle structure 25 having a narrow passage sectional area.

  In the compressor 1 with a built-in oil separator composed of the scroll compressor configured as described above, the separation chamber 6, the lower hole 9, and the communication hole 7 are particularly formed by a combined structure of the fixed spiral member 4 and the casing 5. Thus, it can be formed simply by assembling the fixed spiral member 4 and the casing 5 together. In particular, since the oil separator 3 is formed by using the boss ribs 22a and 22b, the oil separator 3 having a desired form can be formed simply by assembling the fixed spiral member 4 and the casing 5 with a simple structure. it can. That is, since the fixed spiral member 4 and the oil separator forming portion of the casing 5 can be cast, machining of the cylinder portion or the like in the conventional structure is not required at all. In addition, the separation pipe and seal bolt in the conventional structure are not necessary, and the number of parts is greatly reduced. As a result, assembly is facilitated, assembly time is shortened, assembly defects are greatly reduced, and the desired oil separator 3 can be formed under such excellent conditions, which can significantly improve productivity and reduce costs. become. In addition to reducing the number of parts, it is not necessary to provide special oil separator forming walls by forming the oil separator 3 using the boss ribs 22a and 22b, so that the structure can be further simplified, the compressor can be made smaller and lighter. Can be realized.

  Further, in response to the concern about the decrease in oil separation capability due to the abolition of the conventional separation pipe, the oil blowing chamber 8 is blown downward from one or a plurality of communication holes 7 to the oil storage chamber 8 side. It becomes easy to introduce oil (in the conventional oil separation structure, the oil is blown out in a direction perpendicular to the axial direction of the separation chamber), and more efficient separation is possible by changing the angle for each communication hole 7. .

  Further, as the shape of the separation chamber 6, any of a cylindrical shape in which a busbar portion similar to a conventional one extends linearly and a donut-shaped cylindrical shape having a curvature as in the present embodiment are possible. By adopting a donut-shaped cylindrical shape as described above, the degree of freedom of arrangement and shape of the separation chamber 6 is increased, the degree of freedom of the layout is greatly increased, and the compressor 1 as a whole can be made compact. It becomes like this. As described above, the circular cross-sectional shape of the cylindrical shape does not have to be a complete circle as necessary. Further, the role of forming the circular cross-sectional shape between the first and second members is different. There may be.

  Further, by providing the step portion 13 in the gas passage 11 after passing through the oil separation chamber 6, the amount of oil flowing out from the discharge port 12 to the external circuit side can be greatly reduced. Furthermore, by providing the second discharge chamber 14 after passing through the separation chamber 6, the degree of freedom of the installation position of the discharge port 12 can be greatly increased.

  Further, ribs 24 a and 24 b that maintain the communication state between the separation chamber 6 and the oil storage chamber 8 at positions between the boss portions 21 a and 21 b and the outer peripheral walls 23 a and 23 b of the casing 5 and the fixed spiral body constituting member 4. By providing the throttle structure 25 in the passage formed by the ribs 24a and 24b, the oil once stored in the oil storage chamber 8 is prevented from flowing out again to the separation chamber 6 side, and the oil is more reliably The oil separator 3 can exhibit the separator function.

  The structure of the compressor with a built-in oil separator according to the present invention can be applied to any type of compressor with a built-in oil separator, and is particularly suitable for a scroll type compressor.

It is a front view in the open state of the 1st member and 2nd member of the compressor with a built-in oil separator concerning one embodiment of the present invention. It is a fragmentary sectional view (cross-sectional view of an oil separator crossing direction) of the oil separator part of the compressor of FIG. It is a fragmentary sectional view of the lower hole part of the oil separator lower end of the compressor of FIG. It is a fragmentary sectional view (cross section of an oil separator longitudinal direction) which shows the example of a section shape ((A) and (B)) of an oil separator part of the compressor of Drawing 1. It is a fragmentary sectional view of the gas passage part of the compressor of Drawing 1. It is a partial longitudinal cross-sectional view of the conventional oil separator built-in compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor with built-in oil separator 2 Discharge chamber 3 Oil separator 4 Fixed spiral structure member 5 as first member 5 Casing 6 as second member Separation chamber 7 Communication hole 8 Oil storage chamber 9 Lower hole 10 Orifice 11 Gas passage 12 Discharge port 13 Step (or weir)
14 Second discharge chamber 15 Discharge port range 21a, 21b Boss portion 22a, 22b Boss rib 23a, 23b Outer peripheral wall 24a, 24b Rib 25 Restriction structure portion

Claims (13)

  In a compressor incorporating a centrifugal oil separator, the oil separator is formed between the first member and the second member by a combined structure of a first member and a second member constituting the compressor. The first member and the second member have a boss portion around a hole through which the fixing means for the first member and the second member is inserted, and a boss rib extending between the boss portions. A compressor with a built-in oil separator, wherein the oil separator is formed by using the boss rib.   The oil separator includes at least a separation chamber that separates the oil component and the gas component of the oil-containing gas introduced from the discharge chamber by using centrifugal force, and a communication hole between the separation chamber and the discharge chamber. 2. The compressor with a built-in oil separator according to claim 1, further comprising a lower hole through which oil separated in the separation chamber is led to an oil storage chamber located below the chamber, wherein the communication hole is formed in the boss rib. .   A gas passage is provided between the oil separator and a discharge port connected to the outside of the compressor, and the gas passage is also formed by the first member and the second member. The compressor with a built-in oil separator according to claim 1 or 2, wherein the compressor is formed between the first member and the second member, and the gas passage is also formed using the boss rib.   The compressor with a built-in oil separator according to any one of claims 1 to 3, wherein the separation chamber is formed outside the boss rib in the radial direction of the compressor.   The compressor with a built-in oil separator according to any one of claims 2 to 4, wherein the separation chamber is formed in a cylindrical shape having a curved busbar portion.   The compressor with a built-in oil separator according to any one of claims 2 to 5, wherein an opening direction of the communication hole to the separation chamber is directed to the oil storage chamber side.   The compressor with a built-in oil separator according to any one of claims 2 to 6, wherein a plurality of the communication holes are provided.   The compressor with a built-in oil separator according to claim 7, wherein opening directions of the plurality of communication holes to the separation chamber are directed in the same direction.   The compressor with a built-in oil separator according to claim 7, wherein an opening direction to the separation chamber is changed for each communication hole.   The compressor with a built-in oil separator according to any one of claims 3 to 9, wherein a stepped portion or a weir portion is provided in the gas passage.   The compressor with a built-in oil separator according to any one of claims 3 to 10, wherein a second discharge chamber is formed between the separation chamber and the discharge port.   A position of the lower hole between the separation chamber and the oil storage chamber on the downstream side in the oil outlet direction, and an outer peripheral wall of the boss portion and at least one of the first member and the second member. The rib which connects the said boss | hub part and the said outer peripheral wall in the state which maintained the communication state between the said separation chamber and the said oil storage chamber in the position between is provided in any one of Claims 2-11 The compressor with a built-in oil separator.   The oil separator according to any one of claims 1 to 12, comprising a scroll compressor, wherein one of the first member and the second member is a fixed spiral member, and the other is a compressor casing. Built-in compressor.

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