JP2007187060A - Gas compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit oil separated from gas from being made to fly over by the gas delivered from a compressor main body in a gas compressor. <P>SOLUTION: A cyclone block 60 separating refrigerator oil R mixed in refrigerant gas G by turning refrigerant gas G delivered from the compressor main body along an inner surface of a circumference wall 62. Surface (an upper surface 63a of a bottom surface 63) facing upward in the inner surface is formed inclined so as to get lower as it goes toward an end edge 62c on a flow outlet side of refrigerant gas G of the cyclone block 60. Consequently, residence of refrigerant oil R adhering on the upper surface 63c is inhibited. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas compressor, and more particularly to an improvement of a cyclone block that separates oil contained in a discharge gas.

  Conventionally, a gas compressor (compressor) for compressing a gas such as a refrigerant gas and circulating the gas through the air conditioning system is used in an air conditioning system (hereinafter referred to as an air conditioning system).

  Here, for example, a vane rotary type compressor is known as one of general compressors. This vane rotary type compressor is compressed inside a housing having a substantially cylindrical case with one end open and a head connected to one end surface of the case so as to close the one open end of the case. The machine body is housed.

  The main body of the compressor rotates around the axis integrally with the rotating shaft, and has a rotating body including a plurality of plate-like vanes that can be protruded from the outer peripheral surface by a given hydraulic pressure, and the rotating body. It is the structure provided with the cylinder which contacts from the front-end | tip part and side part of the vane which were enclosed from the outer side and protruded.

  And the oil used as the back pressure which makes a vane protrude also functions as lubricating oil inside a compressor main body, is mixed with the gas of compression object, and is discharged from a compressor main body.

  The compressed gas discharged from the compressor main body is sent to the condenser of the air conditioning system via the discharge chamber formed in the space between the compressor main body and the housing, but the oil remains mixed. When discharged, the amount of oil inside the gas compressor is reduced, so that an appropriate back pressure cannot be supplied to the vane.

  The oil that flows out to the condenser line goes around the air conditioning system line together with the gas and returns to the suction port of the gas compressor through the line from the evaporator, but the suction port is originally a gas inlet. For this reason, it is easy to flow into the compressor main body, and therefore, the oil returned to the suction port easily flows into the compressor main body together with the gas.

  Here, since oil is an incompressible liquid, if a large amount of this oil flows into the compressor body, it will become liquid compression in the compression chamber, resulting in increased power loss and noise generation. In addition, the gas compressor itself may be damaged.

  Therefore, an oil separation network that separates oil by a collision action is arranged on the path of the compressed gas discharged from the compressor body, and further, the compressed gas is discharged at a high speed by using the speed of the discharged compressed gas. A cyclone block that swirls and centrifuges the oil is provided.

  The cyclone block forms a substantially bottomed cylindrical body having a peripheral wall, and is installed at a compressed gas discharge port from the compressor body so that the peripheral wall extends substantially horizontally. The above-described oil separation net is also provided in this cyclone block.

And the oil isolate | separated by this cyclone block is collected by the bottom part of the discharge chamber, and is supplied to each part for the back pressure of a vane etc. by the high pressure in the discharge chamber by compressed gas (patent document 1).
Japanese Patent Laying-Open No. 2005-325721 (paragraph number [0027] etc. in the specification)

  By the way, the oil particles separated on the inner surface of the peripheral wall of the cyclone block described above are aggregated with other oil particles while being appropriately flowed by the compressed gas flowing on the inner surface of the peripheral wall of the cyclone block, and the end on the gas flow outlet side of the cyclone block The liquid flows toward the edge, drops downward from the edge, and is collected at the bottom of the discharge chamber.

  However, since the oil particles that have not been aggregated after being separated are lighter than oil droplets formed by agglomeration of the oil particles, they are wound up in the discharge chamber by the compressed gas that is subsequently discharged, and the compressed gas At the same time, it may flow out of the discharge port. In particular, the oil particles adhering to the upward facing surface of the inner surface of the peripheral wall are easily rolled up.

  This invention is made | formed in view of the said situation, and it aims at providing the gas compressor which can suppress that the oil isolate | separated from gas is wound up with the gas discharged from the compressor main body. .

  The gas compressor according to the present invention inclines the bottom surface of the cyclone block and promotes the flow and condensation of oil particles adhering to the surface.

  That is, the gas compressor according to the present invention includes a cyclone block that separates oil mixed in the gas by swirling the gas discharged from the compressor body along the inner surface of the peripheral wall, The surface facing upward is inclined so as to become lower toward the edge of the cyclone block on the gas flow outlet side.

  According to the gas compressor according to the present invention configured as described above, the surface of the inner surface of the peripheral wall facing upward is inclined so as to become lower toward the edge of the gas flow outlet side of the cyclone block. Therefore, the oil particles adhering to the surface are likely to flow toward the lower side in the surface, that is, toward the edge on the gas flow outlet side.

  As a result, the oil particles on this surface tend to condense, and the agglomerated oil droplets drip from the edge of the cyclone block on the gas flow outlet side, and therefore remain attached to the inner surface of the peripheral wall of the cyclone block. Compared with the state which exists, it can suppress winding up with the flow of gas.

  Of the inner surface of the peripheral wall, the surface other than the surface facing upward is a surface (top surface or side surface) where oil particles are difficult to adhere, or even if they adhere, they are inclined surfaces. Therefore, it is not necessary that these top surfaces and side surfaces be inclined surfaces similar to the above-described surfaces (surfaces facing upward), but it is excluded that these surfaces are also inclined surfaces similar to the above-described surfaces. It is not a thing.

  According to the gas compressor according to the present invention, the surface facing upward of the inner surface of the peripheral wall is inclined so as to become lower toward the edge of the gas flow outlet side of the cyclone block. The oil particles adhering to the surface are likely to flow toward the lower edge in the surface, that is, toward the edge on the gas flow outlet side.

  Therefore, oil particles adhering to the inner surface of the peripheral wall of the cyclone block can be reduced. Therefore, the gas compressor according to the present invention can reduce the amount of oil that flows out to the outside.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, the best embodiment of the gas compressor of the invention will be described with reference to the drawings.

  FIG. 1 is a schematic longitudinal sectional view showing a vane rotary compressor 100 which is an embodiment of a gas compressor according to the present invention, FIG. 2 is a diagram showing details of a cyclone block 60 in FIG. 1, and FIG. The figure by arrow B in FIG. 1, (b) is sectional drawing which shows the cross section along CC line in (a), (c) is FIG.2 (b) which concerns on the modification of the compressor 100 shown in FIG. FIG.

  The illustrated compressor 100 is configured, for example, as a part of an air conditioning system that performs cooling using the heat of vaporization of a cooling medium, and includes other components such as a condenser, an expansion valve, and an evaporator (any of them) Are also provided on the circulation path of the cooling medium.

  The compressor 100 compresses a gaseous cooling medium taken from the evaporator of the air conditioning system, that is, the refrigerant gas G, and supplies the compressed refrigerant gas G to the condenser of the air conditioning system. The condenser liquefies the compressed refrigerant gas G and sends it to the expansion valve as a high-pressure liquid refrigerant (liquid).

  The high-pressure liquid refrigerant is reduced in pressure by the expansion valve and sent to the evaporator. The low-pressure liquid refrigerant absorbs heat from ambient air and vaporizes in the evaporator, and cools the air around the evaporator by heat exchange with the heat of vaporization.

  Further, the compressor 100 rotates around the rotation shaft 51 to compress the refrigerant gas G, a housing including the case 11 and the front head 12 that covers the compressor body, and a drive of an in-vehicle engine (not shown). And a transmission mechanism 13 that transmits the rotational driving force supplied from the source to the rotary shaft 51 so as to be connectable and disconnectable.

  The case 11 constituting one side of the housing has a substantially cylindrical shape with one end open, and a high-pressure refrigerant gas G compressed by the suction port 12a through which the low-pressure refrigerant gas G is drawn from the evaporator of the air conditioning system and the compressor body. A discharge port 11a for discharging the air to the condenser of the air conditioning system is formed. The suction port 12a and the suction chamber 34 formed in the front head 12 communicate with each other via a check valve 12b.

  The front head 12 which is the other side of the housing is formed in a lid shape so as to close the open end surface of the case 11 and is connected to the case 11. And it is formed so that the rotating shaft 51 may penetrate the substantially central portion of the front head 12.

  The compressor main body accommodated in the housing includes a rotation shaft 51, a cylindrical rotor 50 in which the rotation shaft 51 is fitted and rotated around the rotation shaft 51, and an outer peripheral surface of the rotor 50. The inner wall surface surrounding the cross section is formed into a substantially elliptical shape, both ends of the cylinder 40 and the rotor 50 protrude from the outer peripheral surface, and the protruding tip abuts against the inner wall surface of the cylinder 40. The five plate-like vanes 58 embedded in the rotor 50 at equal angular intervals around the rotation shaft 51, the protrusion length changing following the shape change of the inner wall surface, and the rotor 50, the cylinder 40, and the vane 58 The front side block 30 and the rear side block 20 are arranged on both end surfaces, respectively, and separate the space partitioned by the vanes 58 from the outside.

  The refrigerant gas G is sucked from the suction port 12a through the suction chamber 34 by the two side blocks 20 and 30, the rotor 50, the cylinder 40, and the two vanes 58 and 58 that follow each other in the rotational direction of the rotor 50. The five compression chambers 48 are defined, and the volume of each compression chamber 48 is repeatedly increased and decreased as the rotary shaft 51 rotates, whereby the refrigerant gas G sucked into each compression chamber 48 is compressed, and the compression chambers are compressed. 48 is discharged into the discharge chamber 25, and is discharged from the discharge chamber 25 through the discharge port 11a to the line to the condenser of the air conditioning system as high-pressure refrigerant gas G.

  A cyclone block 60 including an oil separator 61 for separating the refrigerating machine oil R mixed in the refrigerant gas G from the refrigerant gas G is disposed on the passage discharged from each compression chamber 48 to the discharge chamber 25. ing.

  The oil separator 61 is a metal mesh formed in a cylindrical shape, and allows the refrigerant gas G discharged from the compression chamber 48 to pass. A part of the refrigerating machine oil R mixed in the refrigerant gas G is a mesh of the metal mesh (gap ) Cannot be passed through and collides with the wire net itself and adheres to the net itself, so that the refrigeration oil R can be separated from the refrigerant gas G.

  On the other hand, the refrigerant gas G contains a refrigerating machine oil R that cannot be completely separated even after passing through the oil separator 61, and the cyclone block 60 is made up of the refrigerating machine oil R as shown in FIGS. 2 (a) and 2 (b). A peripheral wall 62 for centrifuging the refrigerating machine oil R from the refrigerant gas G is provided.

  That is, the cyclone block 60 rotates the refrigerant gas G mixed with the refrigerating machine oil R discharged from the compression chamber 48 and passing through the oil separator 61 along the inner surface 62a of the peripheral wall 62, whereby the refrigerant gas G gas The refrigerating machine oil R mixed in is collided with and adhered to the inner surface 62 a of the peripheral wall 62 and separated from the refrigerant gas G.

  The inner surface 62a of the peripheral wall 62 has a substantially rectangular outline in cross section (cross section parallel to the paper surface in FIG. 2 (a)). The upper surface 63a of the lower wall 63 (hereinafter referred to as the bottom wall 63) of the peripheral wall 62 is, as shown in FIG. 2 (b), toward the edge 62c on the refrigerant gas G flow outlet side. It is formed as an inclined surface so that the height is lowered. Of the peripheral wall 62, the other wall portions excluding the bottom wall 63 extend substantially horizontally.

  Then, the refrigerating machine oil R separated by the oil separator 61 and the refrigerating machine oil R that has been centrifuged and adhered to the inner surface of the peripheral wall 62 are dropped downward from the edge 63c of the cyclone block 60 to the bottom of the discharge chamber 25. It is accumulated.

  The accumulated refrigerating machine oil R is used as a hydraulic supply source for projecting the vane 58 through an oil passage formed in the compressor body, or for the purpose of lubrication, airtightness holding, cooling, cleaning, etc. of the sliding part. Used.

  In addition, a portion on one side of the rotating shaft 51 that protrudes from both end surfaces of the rotor 50 is pivotally supported by the bearing portion 32 of the front side block 30 and extends outward through the front head 12. ing. Similarly, the other portion of the protruding portion of the rotating shaft 51 is pivotally supported by the bearing portion 22 of the rear side block 20.

  Then, the compressor body is supported in the internal space of the case 11 by supporting the rotating shaft 51 by the front head 12 and by supporting the outer peripheral portions of the side blocks 20 and 30 on the inner peripheral surface of the case 11 by O-rings. It is arranged at a predetermined position.

  In the present embodiment, the transmission mechanism 13 is an electromagnetic clutch, and is rotatably supported by the front head 12 via a radial ball bearing 13f. A pulley 13a rotated in the clockwise rotation direction as viewed from the view B, a base 13c fixed to the rotation shaft 51 with a bolt 15 and rotated integrally with the rotation shaft 51, and a side end surface of the pulley 13a (FIG. 1). The armature 13e as a friction plate that is slidably connected to the right end surface), the inner peripheral portion is fixed to the base portion 13c, the outer peripheral portion is fixed to the armature 13e, and the portion between the inner peripheral portion and the outer peripheral portion A leaf spring 13d formed of a member having elastic force, and a coil 13b fixed to the front head 12 and housed in the pulley 13a. Example was a configuration.

  Here, when the coil 13b is not energized, the armature 13e is positioned away from the side end face of the pulley 13a due to the elastic force of the leaf spring 13d, and the rotational driving force is transmitted from the in-vehicle engine to the pulley 13a. Even if the pulley 13a rotates, this rotational driving force is not transmitted to the armature 13e, and the leaf spring 13d connected to the armature 13e and the base portion 13c connected via the leaf spring 13d do not rotate. Therefore, the rotating shaft 51 connected to the base portion 13c also does not rotate.

  On the other hand, when the coil 13b is energized, the armature 13e is attracted to the pulley 13a against the elastic force of the leaf spring 13d by the electromagnetic attraction force of the coil 13b, and the armature 13e and the side end surface of the pulley 13a contact each other. Touch. As a result, when the rotational driving force is transmitted from the in-vehicle engine to the pulley 13a and the pulley 13a rotates, the armature 13e rotates together with the pulley 13a by the frictional force with the side end surface of the pulley 13a.

  Then, the leaf spring 13d connected to the armature 13e and the base portion 13c connected via the leaf spring 13d also rotate to rotate the rotating shaft 51 connected to the base portion 13c. As a result, the rotor 50 that rotates integrally with the rotating shaft 51 rotates in the gas compression operation direction, that is, the direction in which the refrigerant gas G in the compression chamber 48 is compressed, and the compression operation of the refrigerant gas G is started.

  The refrigerant gas G compressed in the compression chamber 48 is discharged into the discharge chamber 25, but since the refrigerating machine oil R is mixed in the refrigerant gas G, the refrigerant gas G discharged from the compression chamber 48 into the discharge chamber 25. The cyclone block 60 provided on this path separates the refrigerating machine oil R.

  That is, when the refrigerant gas G containing the refrigerating machine oil R discharged from the compression chamber 48 passes through the oil separator 61, at least a part of the refrigerating machine oil R mixed in the refrigerant gas G passes through the mesh of the wire mesh. The refrigerating machine oil R that collides with the net itself and adheres to the net itself without being able to coagulate, and aggregates and flows down to the inner surface 62 a of the cyclone block 60.

  As shown in FIG. 2A, the refrigerant gas G that has passed through the oil separator 61 turns along the inner surface 62a of the circumferential wall 62 of the cyclone block 60 while turning the edge 62c of the circumferential wall 62 (on the outlet side of the refrigerant gas G). From the edge) to the discharge chamber 25.

  The refrigerating machine oil R still mixed in the refrigerant gas G collides with and adheres to the inner surface 62a of the peripheral wall 62 by the centrifugal force generated during the rotation along the inner surface 62a of the peripheral wall 62, and the refrigerant gas G that is turning Separated from.

  Here, the refrigerating machine oil R adhering to each inner surface 62a of the peripheral wall 62 flows down to the lower one, but the upper surface of the bottom wall of the cyclone block in the conventional compressor is a substantially horizontal surface. The refrigeration oil adhering to the bottom of the cyclone block 60 in the compressor 100 of the present embodiment is not substantially horizontal, but the upper surface 63a of the cyclone block 60 is not a substantially horizontal plane, and is closer to the edge 62c on the refrigerant gas G flow outlet side. Since the surface is inclined so as to be low in height, the refrigeration oil adhering to the upper surface 63a does not easily stay like the upper surface in the conventional compressor, and the adhering refrigerating machine oil does not easily stay. The machine oil R is easy to flow along the inclination, that is, toward the end edge 62c, and the upper surface 63a has a refrigerating machine oil R. It can be remarkably prevented from staying.

  When the refrigerating machine oil R stays on the inner surface 62a of the peripheral wall 62 including the upper surface 63a, the refrigerating machine oil R wound up in the discharge chamber 25 by the refrigerant gas G flowing through the inner surface 62a is Although it flows out from the discharge chamber 25 to the line connected to the condenser of the air conditioning system through the discharge port 11a, the upper surface 63a of the bottom wall 63 in the compressor 100 of the present embodiment has a refrigerating machine oil R as described above. Therefore, it is possible to greatly suppress the refrigerating machine oil R from flowing out to the line connected to the condenser of the air conditioning system.

  In the compressor 100 according to the present embodiment, the bottom wall 63 itself extends so as to incline so that its height decreases toward the edge 62c on the refrigerant gas G flow outlet side. The gas compressor according to the present invention does not require the bottom wall 63 itself to be inclined, and at least its upper surface 63a increases in height toward the edge 62c on the refrigerant gas G flow outlet side. For example, as shown in FIG. 2C, the lower surface 63b of the bottom wall 63 may be formed substantially horizontally.

  As described above, the compressor 100 according to the embodiment in which the lower surface 63b is formed substantially horizontally can exhibit the same operations and effects as those of the compressor 100 according to the above-described embodiment.

  However, if the lower surface 63b is formed substantially horizontally and the upper surface 63a is formed so as to be inclined, the thickness of the bottom wall 63 becomes non-uniform and the material cost at the time of manufacture increases due to the useless thickness. It is preferable from the viewpoint of manufacturing cost reduction that the bottom wall 63 itself has a substantially uniform thickness and the bottom wall 63 itself is inclined as shown in FIG.

  Further, the surface of the inner surface 62a of the peripheral wall 62 other than the surface facing upward (the upper surface 63a of the bottom wall 63) (such as the inner side surface and the top surface of the peripheral wall 62) may be difficult to adhere the particles of the refrigerator oil R. In the first place, since it is an inclined surface (including a vertical surface) even if it adheres, or the top surface is easy to drip, the degree of adhesion of the refrigerating machine oil R is low. Therefore, in the compressor 100 of the present embodiment, the ceiling 100 Although the surface is not particularly inclined, as shown in FIGS. 3A and 3B, the inner surface (top surface) 64a of the top wall 64 is also the end on the refrigerant gas G flow outlet side. It can also be formed on an inclined surface so that its height decreases toward the edge 62c.

  The compressor 100 of the embodiment configured as described above can also exhibit the same operations and effects as the compressor 100 of the above-described embodiment.

It is a schematic longitudinal cross-sectional view which shows the vane rotary type compressor which is one Embodiment of the gas compressor which concerns on this invention. It is a figure which shows the detail of the cyclone block in FIG. 1, (a) is a figure by the arrow B in FIG. 1, (b) is sectional drawing which shows the cross section along CC line in (a), (c). These are sectional drawings equivalent to (b) about a modification. It is a figure which shows the detail of the cyclone block in a modification, (a) is a figure equivalent to FIG. 2 (a), (b) is sectional drawing which shows the cross section along CC line in (a).

Explanation of symbols

20 Rear side block 30 Front side block 40 Cylinder 48 Vane 50 Rotor 51 Rotating shaft 60 Cyclone block 61 Oil separator 62 Peripheral wall 62c Edge 63 on the outlet side Bottom wall 63a Upper surface (surface facing upward)
100 compressor (gas compressor)

Claims (2)

A cyclone block that separates oil mixed in the gas by swirling the gas discharged from the compressor body along the inner surface of the peripheral wall,
A gas compressor characterized in that a surface of the inner surface facing upward is inclined so as to become lower toward an end edge of the cyclone block on the gas flow outlet side. Of the peripheral wall, the entire peripheral wall portion corresponding to the inner surface inclined so as to become lower toward the edge on the flow outlet side is inclined so as to become lower toward the edge on the flow outlet side. The gas compressor according to claim 1, wherein the gas compressor extends.

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