WO2008038456A1

WO2008038456A1 - Compressor with built-in oil separator

Info

Publication number: WO2008038456A1
Application number: PCT/JP2007/064877
Authority: WO
Inventors: Tatsuki Nomura
Original assignee: Sanden Corporation
Priority date: 2006-09-27
Filing date: 2007-07-30
Publication date: 2008-04-03
Also published as: CN101517239A; CN101517239B; US20100034683A1; JP2008082238A

Abstract

A compressor with a built-in centrifugal oil separator is characterized in that the oil separator is formed between a first member and a second member constituting a compressor by the combined structure of the first member and the second member. In the compressor, the productivity can be enhanced and the cost can be reduced by simplifying the structure of the oil separation part, and the freedom degree of the design of the discharge port position can be kept.

Description

Specification

Oil separator built-in compressor

Technical field

TECHNICAL FIELD [0001] The present invention relates to a compressor with a built-in oil separator, and particularly relates to a compressor with a built-in oil separator that simplifies the mechanism with a built-in oil separator, reduces the number of parts, facilitates assembly, and reduces costs.

Background 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 a conventional compressor with a built-in oil separator, as shown in FIG. 6, for example, a scroll type compressor having 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 into a rear casing 106 that forms a discharge chamber 105 into which the gas (for example, refrigerant gas) introduced is introduced through the 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 part, and a separation pipe 109 is inserted or press-fitted onto the shaft thereof, and the upper end side is arranged. A structure that is fixed or locked by the snap ring 110 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. 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!

[0003] 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 is introduced into the oil separation chamber 108 through the gas force communication hole 113 containing the oil in the discharge chamber 105. Is done. 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 separation pipe 109, is discharged from the discharge port 112, and the oil separated by 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 passes through the orifice 116. And returned to the suction chamber 117.

Patent Document 1: JP-A-11 93880

Disclosure of the invention

Problems to be solved by the invention

[0004] 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 thread part for the seal bolt 111, etc. all need to be formed by machining. Since there are many processed parts, productivity is low and cost is high.

[0005] 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 is relatively long, so that the workability of this part is poor. In addition, since the oil separation chamber 108 (cylinder portion) has a cylindrical shape, the space for installing the oil separation portion is limited, and the overall length of the casing is increased. Therefore, productivity is low and layout flexibility is small.

[0006] In addition, 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. Also, defects are likely to occur during the press-fitting process of the separation pipe 109 and the tightening process of the seal bolt 111. Therefore, there are problems that productivity is low and costs are high in both manufacturing and assembly.

[0007] Furthermore, the compressed gas after oil separation is free to the layout of the separation mechanism that forces the compressor gas 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. Since there is no degree, the position of the discharge port 112 is also restricted. Therefore, there is a problem that the design of the compressor itself with a small degree of freedom in the position of the discharge port 112 and the connection structure with the outside are restricted.

[0008] Therefore, the object of the present invention is to focus on the above-mentioned problems, simplify the structure of the oil separation section, thereby improving productivity and reducing costs and designing the discharge port position. An object of the present invention is to provide a compressor with a built-in oil separator that ensures a degree of freedom.

Means for solving the problem

[0009] In order to solve the above problems, a compressor with a built-in oil separator according to the present invention includes a compressor with a built-in centrifugal oil separator, and the oil separator is It is characterized in that it is formed between the first member and the second member by a combined structure of the first member and the second member constituting the compressor.

[0010] More specifically, for example, at least the oil separator cassette, 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, and the separation chamber and the discharge chamber And a lower hole through which oil separated in the separation chamber is led out to the oil storage chamber located below the separation chamber. These are the first member and the second member. The first member and the second member are formed by the mating structure with the first member.

[0011] That is, the cylinder part (separation chamber), the communication hole part, and the lower hole part of the oil separation mechanism are formed by a combined structure in which the first member and the second member constituting the compressor are combined. Thus, these parts 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, the fixing and locking mechanism, and the seal bolt can be abolished, so the structure of the entire separation mechanism can be simplified and the number of parts is greatly reduced. Therefore, shortening assembly time, facilitating assembly, and cost reduction can be achieved. In addition, as a result of the elimination of seal bolts, the overall length of the oil separation section can be shortened and downsized, and the compressor as a whole can be downsized.

In the present invention, a gas passage is provided between the oil separator and the discharge port connected to the outside of the compressor, and the gas passage is also connected to the first member and the first member. The force S can be adopted by adopting the structure formed between the first member and the second member by the mating structure with the two members. By connecting the discharge port to this gas passage, the gas separated from the oil is smoothly discharged from the discharge port to the outside.

[0013] In the compressor with a built-in oil separator according to the present invention, the oil separator basically has the force S and the number of parts that are configured in a centrifugal oil separator, and there is no mechanical processing portion. The degree of freedom of the chamber shape is kept extremely high. Therefore, this 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 (as a whole, a part of a donut shape is formed). It can also be formed in a separation chamber). In particular, by making this separation chamber into a cylindrical shape with a curvature (doughnut shape) etc., the degree of freedom in layout is greatly increased. The whole compressor can be made compact.

[0014] The cross-sectional shape of the cylindrical shape is preferably a substantially perfect circle, but due to the configuration of the mating structure of the first member and the second member, there is a slight amount on the inner surface of the cylindrical shape. A difference in curvature may occur between the circular arcs in the cylindrical cross section of the first member and the second member that form a step or form a cylindrical inner surface. Further, when forming the cylindrical inner surface, a difference in the circumference 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 circular grooves in the cylindrical cross section of the first member and the second member forming the cylindrical inner surface.

[0015] Further, in order to avoid a decrease in separation capacity due to the abolition of the separation pipe, the blowing direction of the compressed gas blown out from the communication hole to the oil separation chamber is changed from that in the conventional structure. An equivalent level of separation capability can be fully realized. 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 centrifugal force for separation is effectively applied to the oil, and the oil is supplied to the oil storage chamber side. It becomes possible to separate efficiently toward

[0016] It is possible to provide a plurality of communication holes to the separation chamber. In the case of providing a plurality, it is possible to adopt a structure in which the opening directions of the plurality of communication holes to the separation chamber are 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. 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 preferred embodiment. 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 according to the shape of the oil separation chamber. This makes it possible to guide the oil separated efficiently to the oil storage chamber.

[0017] A structure in which a stepped portion or a weir 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.

[0018] Furthermore, it is also possible to adopt a structure in which a second discharge chamber (a chamber immediately before the discharge port, separate from the discharge chamber) is formed between the separation chamber and the discharge port! it can. Such a structure In this case, the second discharge chamber only needs to communicate with the discharge port, so by appropriately setting the formation range and shape of the second discharge chamber, the degree of freedom of the discharge port installation position is greatly increased. Will be.

[0019] The oil separator built-in structure according to the present invention can be applied to substantially any type of compressor, and is particularly suitable for a scroll type compressor. In the case of a scroll type 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. Effect

[0020] Thus, according to the compressor incorporated with an oil separator according to the present invention, the first member (for example, without machining the cylinder, the communication hole, the separation pipe holding portion, the lower hole, and the like in the conventional structure) Since the oil separator can be formed by the combined structure of the fixed spiral member and the second member (for example, the casing) and the separation pipe can be eliminated, the following effects can be obtained.

(1) Improve machining productivity and reduce costs by eliminating the machining of the oil separator.

(2) It is possible to reduce costs and improve assembly by reducing the number of parts.

(3) The assembly process can be greatly simplified, and the separation pipe press-in process, which has been a bottleneck in the past, eliminates the sealing bolt tightening process, eliminates the occurrence of defects in these conventional processes, and greatly increases the defect rate in the assembly process. Can be reduced.

(4) The degree of freedom of the discharge port position can be greatly increased, which can greatly improve the layout of the discharge port and thus the overall layout of the compressor incorporated in the system.

Brief Description of Drawings

FIG. 1 is a cross-sectional view of a portion including a discharge chamber of a compressor incorporated with an oil separator according to an embodiment of the present invention.

[Fig. 2] Partial sectional view of oil separator section of compressor in Fig. 1 (transverse direction of oil separator) FIG.

3 is a partial cross-sectional view of a lower hole at the lower end of the oil separator of the compressor in FIG.

4 is a partial cross-sectional view (cross-sectional view in the oil separator longitudinal direction) showing an example of the cross-sectional shape ((A) and (B)) of the oil separator portion of the compressor in FIG. 1. FIG.

FIG. 5] is a partial cross-sectional view of the gas passage portion of the compressor of FIG.

6] A partial longitudinal sectional view of a conventional compressor with a built-in oil separator.

Explanation of symbols

1 Oil separator 1 Compressor with built-in lator

2 Discharge chamber

3 Oil separator 1

4 Fixed spiral body component as the first member

5 Second part ₍ as casing

6 Separation chamber

7 Communicating

8 Oil storage room

9 Bottom hole

10 Orifice

11 Gas passage

12 Discharge port

13 steps (or weir)

14 Second discharge chamber

15 Discharge port range

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a portion including a discharge chamber 2 of a compressor 1 with a built-in oil separator according to an embodiment of the present invention. The compressor 1 is, 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 as shown in FIG. Gas compressed by the compression mechanism 103 (for example, refrigerant gas) is discharged into the discharge hole 104 (see FIG. 6). Is introduced into the discharge chamber 2.

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. The 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 has a cylindrical shape with a curved busbar (doughnut shape). A cylindrical shape forming a part of Between the separation chamber 6 and the discharge chamber 2, there are provided communication holes 7 through which gas containing oil from the discharge chamber 2 is blown into the separation chamber 6. In this embodiment, a plurality of (two) communication holes are provided. 7 is provided. 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 central axis of the cylindrical shape 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 are directed toward the oil storage chamber 8 formed below the separation chamber 6 so that the opening direction to the separation chamber 6 is directed to the embodiment shown in FIG. Then, as shown in FIG. 4 (B), for each communication hole 7, the opening direction to the separation chamber 6, that is, the angle of the hole extending direction of the communication hole 7 is changed. 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. 4 (A), the opening direction of each communication hole 7 to the separation chamber 6 is directed in the same direction, and the opening direction of all the communication holes 7 Can 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. The lower hole 9 is formed at a position eccentric from the center of the cylindrical shape of the separation chamber 6 as shown in FIG. The oil stored in the oil storage chamber 8 is returned to the suction chamber 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 communicating 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 the flow in the gas passage 11 is bent due to the presence of the step portion 13. Thus, oil is prevented from flowing out from the discharge port 12 to the outside.

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

[0027] In the compressor 1 with a built-in oil separator composed of the scroll compressor configured as described above, in particular, the separation chamber 6, the lower hole 9, and the communication hole 7 are combined with the fixed spiral member 4 and the casing 5. By forming the structure, it can be easily formed simply by assembling the fixed spiral member 4 and the casing 5. In other words, since the oil separator forming portion of the fixed spiral member 4 and the casing 5 can be forged, there is no need for machining of the cylinder portion or the like in the conventional structure. In addition, separation pipes and seal bolts in the conventional structure are not required, and the number of parts is greatly reduced. As a result, assembly is facilitated, assembly time is shortened, assembly defects are greatly reduced, and productivity can be greatly improved and costs can be reduced.

[0028] In addition, in response to concerns about a decrease in oil separation capacity due to the abolition of the conventional separation pipe, the oil storage is achieved by blowing downward from one or a plurality of communication holes 7 to the oil separation chamber 6. It becomes easier to introduce oil to the chamber 8 side (in the conventional oil separation structure, the oil was blown out in a direction perpendicular to the axial direction of the separation chamber), and by changing the angle for each communication hole 7, the efficiency is improved. Separation is possible.

[0029] In addition, 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 in this embodiment, the degree of freedom of arrangement and shape of the separation chamber 6 is increased, the degree of freedom of layout is greatly increased, and the compressor 1 as a whole is made more compact. Can also contribute. As for the circular cross section of the cylindrical shape, the role of forming the circular cross section between the first and second members as well as between the first and second members is not necessary, as described above. There may be a difference.

[0030] Also, 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. In addition, by providing the second discharge chamber 14 after passing through the separation chamber 6, the installation position of the discharge port 12 can be freely set. The degree can be greatly increased.

Industrial applicability

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.

Claims

The scope of the claims

[I] In a compressor incorporating a centrifugal oil separator, the oil separator is divided into a first member and a second member by a combination structure of a first member and a second member constituting the compressor. An oil separator built-in compressor characterized by being formed between the members.

[2] Oil separator gas Separation chamber that separates at least oil components and gas components of oil-containing gas introduced from the discharge chamber using centrifugal force, and a communication hole between the separation chamber and the discharge chamber 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 separation chamber.

[3] 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 a structure in which the first member and the second member are combined. The compressor with a built-in oil separator according to claim 1, wherein the compressor is formed between the first member and the second member.

4. The oil separator built-in compressor according to claim 2, wherein the separation chamber is formed in a cylindrical shape with a busbar portion extending linearly.

5. The oil separator built-in compressor according to claim 2, wherein the separation chamber is formed in a cylindrical shape having a curved busbar portion.

6. The compressor with a built-in oil separator according to claim 2, wherein an opening direction of the communication hole to the separation chamber is directed to the oil storage chamber side.

[7] The compressor incorporated with an oil separator according to claim 2, wherein a plurality of the communication holes are provided.

[8] 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.

[9] The oil separator built-in compressor according to claim 7, wherein an opening direction to the separation chamber is changed for each of the communication holes.

10. The compressor with a built-in oil separator according to claim 3, wherein a stepped portion or a weir portion is provided in the gas passage.

[II] The oil separator built-in compression according to claim 2, wherein a second discharge chamber different from the discharge chamber is formed between the separation chamber and a discharge port connected to the outside of the compressor. Machine. 2. The compressor with a built-in oil separator according to claim 1, comprising a scroll type compressor, wherein one of the first member and the second member comprises a fixed spiral member, and the other comprises a compressor casing.