JP2015090135A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas compressor that can prevent the central side of the inside end surface of a rear side block from protrusively deforming when the outer peripheral surface of the rear side block of a compressor body is press-fitted into the inner peripheral surface of a housing.SOLUTION: On an outside end surface 15a of a rear side block 15 of a compressor body, recessed discharge gas passages 29a, 29b for introducing a discharge medium from discharge ports 28a, 28b to an oil separator are formed, and the discharge gas passage 29a, 29b are formed on the oil separator side of the outer peripheral surface of the rear side block 15 with respect to a position press-fitted into the inner peripheral surface of the housing.

Description

  The present invention relates to a gas compressor installed in an air conditioner mounted on a vehicle, for example.

  For example, vehicles such as automobiles are provided with an air conditioner for adjusting the temperature in the passenger compartment. Such an air conditioner has a loop-like refrigerant cycle in which refrigerant (cooling medium) is circulated, and this refrigerant cycle is provided with an evaporator, a gas compressor, a condenser, and an expansion valve in this order. ing. The gas compressor of the air conditioner compresses the gaseous refrigerant evaporated by the evaporator into a high-pressure refrigerant gas and sends it to the condenser.

  As such a gas compressor, conventionally, a rotor having a plurality of vanes provided in a cylinder having a substantially elliptical inner peripheral surface, the tip portion of which is in sliding contact with the inner peripheral surface of the cylinder and provided so as to protrude and be housed. A vane rotary type gas compressor that is rotatably supported is known (for example, see Patent Document 1).

  A vane rotary type gas compressor described in Patent Document 1 includes a rotor that can rotate integrally with a rotating shaft, a cylinder that has a contoured inner peripheral surface that surrounds the outer periphery of the rotor, and a cylinder that extends from the outer peripheral surface of the rotor. A compressor body having a plurality of vanes provided so as to protrude toward the inner peripheral surface, and two side blocks that close both ends of the rotor and the cylinder and rotatably support both sides of the rotating shaft. Yes.

  This compressor body was introduced into the compression chamber by reducing the volume of the compression chamber formed between the rotor outer peripheral surface and the cylinder inner peripheral surface with the rotation of the rotor by two adjacent vanes. The low-pressure refrigerant gas is compressed, and the compressed high-pressure refrigerant gas is discharged to the outside.

  The compressor body is housed in a housing that is open at one end and closed at the other end, and the opening at one end side (side from which refrigerant gas is sucked in from the outside) of the housing is closed by the front head. Yes. Specifically, bolts are fixed so that the outer surface of the front side block on one side (front head side) of the compressor body is located in the front head, and the other side (opposite side of the front head) of the compressor body is fixed. The outer peripheral surface of the rear side block is press-fitted (fitted) to the inner peripheral surface of the housing.

  An oil separator provided on the outer end surface of the rear side block is disposed in the discharge chamber formed in the housing on the rear side block side. The high-pressure refrigerant gas compressed in the compressor chamber of the compressor body (mixed with refrigerating machine oil) enters the oil separator through a discharge port formed in the rear side block and a discharge gas passage communicating with the discharge port. Once introduced, the refrigerant gas separated from the refrigerating machine oil is discharged into the discharge chamber.

  The oil separator is integrally formed with the oil separator block, and the oil separator block is bolted to the outer end surface of the rear side block.

JP 2008-95566 A

  By the way, the above-described discharge gas passage is formed by indenting the outer end surface (surface on the oil separator block side) of the rear side block on the mating surface where the rear side block and the oil separator block are in close contact with each other. That is, the outer end surface (surface on the oil separator block side) of the rear side block is cut into a groove shape to form a discharge gas passage, and the portion of the rear side block where the discharge gas passage is formed is thicker than the other portions. Is thinner.

  Further, as described above, the compressor main body is held and fixed in the housing by press-fitting (fitting) the outer peripheral surface of the rear side block (the peripheral surface on the oil separator block side) into the inner peripheral surface of the housing.

  For this reason, when the outer peripheral surface (the peripheral surface on the oil separator block side) of the rear side block of the compressor body is press-fitted into the inner peripheral surface of the housing, the discharge chamber side in the housing with respect to the outer peripheral side periphery of the rear side block A force in the direction acts. At this time, since a groove-like discharge gas passage is formed on the outer end face (surface on the oil separator block side) of the rear side block and the thickness of the portion is reduced, the discharge gas passage on the outer end face of the rear side block is reduced. A bending moment in the direction of the compressor main body (on the side opposite to the discharge chamber) acts on the vicinity of the formed area.

  As a result, the center side of the inner end face of the rear side block is deformed into a convex shape. If the center side of the inner end face of the rear side block is deformed in a convex shape, the gap with a predetermined width formed between the end face of the rotor in the compressor body (end face on the rear side block side) is reduced, and the inner end face of the side block There is a possibility that the center side of the rotor contacts the end face of the rotor.

  Therefore, according to the present invention, when the outer peripheral surface (the oil separator block side peripheral surface) of the rear side block of the compressor body is press-fitted into the inner peripheral surface of the housing, the center side of the inner end surface of the rear side block is deformed into a convex shape. It aims at providing the gas compressor which can prevent this.

  In order to solve the above-described problems, a gas compressor according to the present invention compresses a supplied medium and discharges a compressed high-pressure medium, and closes both end faces of the compressor body. An oil separator that separates the oil component mixed from the discharge medium discharged from the discharge port formed in the side block from the compressor body, provided on one side block and the outer end face side of one of the side blocks A substantially cylindrical housing that houses the compressor body and the oil separator and press-fits the outer peripheral surface of the one side block into the inner peripheral surface of the housing to hold and fix the compressor main body. A concave discharge medium passage for introducing the discharge medium from the discharge port to the oil separator is formed on the outer end surface of the one side block, and the discharge medium path is Of the outer peripheral surface of serial one side block, it is characterized in that it is formed in the oil separator side of a position to be press-fitted into the inner peripheral surface of the housing.

  According to the gas compressor of the present invention, the discharge medium passage is formed closer to the oil separator than the position of the outer peripheral surface of one side block that is press-fitted into the inner peripheral surface of the housing. Therefore, when the outer peripheral surface of one side block is press-fitted into the inner peripheral surface of the housing, a bending moment in the direction of the compressor body does not act, and the center side of the inner end surface of one side block is convex. It is possible to prevent deformation.

The figure which showed the housing side of the gas compressor (vane rotary type gas compressor) which concerns on embodiment of this invention as a cross-sectional shape. The exploded perspective view of this gas compressor. AA sectional view taken on the line AA of FIG. The perspective view which shows the outer side end surface side of the rear side block in this embodiment. (A) is a figure which shows the external appearance of the oil separator (oil separator block) provided in the outer side end surface of a rear side block, (b) is a figure which shows the back side of an oil separator block. BB sectional drawing of FIG. Sectional drawing which shows the outer side end surface which formed the discharge gas channel | path of the conventional rear side block.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a view showing a housing side of a vane rotary type gas compressor (hereinafter referred to as “compressor”) as a gas compressor according to an embodiment of the present invention, and FIG. 2 is an exploded view of the compressor. It is a perspective view.

(Overall configuration of compressor 1)
The illustrated compressor 1 is configured as a part of an air conditioning system (hereinafter referred to as an “air conditioning system”) that performs cooling by using the heat of vaporization of a cooling medium, for example, and is a condensing component that is another component of the air conditioning system. It is provided on the circulation path of the cooling medium together with a condenser, an expansion valve, an evaporator, etc. (all not shown). In addition, as such an air conditioning system, the air conditioning apparatus for adjusting the temperature in the vehicle interior of a vehicle (automobile etc.) is mentioned, for example.

  The compressor 1 compresses the refrigerant gas as a gaseous cooling medium taken from the evaporator of the air conditioning system, and supplies the compressed refrigerant gas to the condenser of the air conditioning system. The condenser liquefies the compressed refrigerant gas and sends it to the expansion valve as a high-pressure liquid refrigerant. The high-pressure and 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.

  As shown in FIGS. 1 and 2, the compressor 1 includes a substantially cylindrical housing 2 having one end side (left side in FIGS. 1 and 2) opened and the other end side closed, and one end side of the housing 2. The front head 3 that closes the opening, the compressor main body 4 housed in the housing 2, and the electromagnetic for transmitting the driving force from the engine (not shown) of the vehicle (automobile) as the driving source to the compressor main body 4. A clutch 5 is provided.

  The front head 3 is formed in a lid shape that closes the opening end surface of the housing 2, and is fastened and fixed by a plurality of bolts 6 around the opening end portion on one end side of the housing 2. The front head 3 has a suction port 7 for sucking low-pressure refrigerant gas from an evaporator (not shown) of the air-conditioning system, and the housing 2 air-conditions the high-pressure refrigerant gas compressed by the compressor body 4. A discharge port 8 for discharging to a condenser (not shown).

  As shown in FIG. 3, the compressor body 4 includes a substantially cylindrical rotor 11 that rotates integrally with the rotary shaft 10, and a substantially elliptical inner peripheral surface that surrounds the rotor 11 from the outside of the outer peripheral surface 11a. The cylinder 12 having 12a, the five plate-like vanes 13 provided so as to protrude from the outer peripheral surface 11a of the rotor 11 toward the inner peripheral surface 12a of the cylinder 12, and both end surfaces of the rotor 11 and the cylinder 12 are closed. Two side blocks (a front side block 14 and a rear side block 15 (see FIG. 2)) are provided. 3 is a cross-sectional view taken along line AA in FIG. In FIG. 3, the housing 2 on the outer peripheral surface side of the compressor body 4 is omitted.

  An O-ring 16 as a seal member is provided on the outer peripheral surfaces of the front side block 14 and the rear side block 15 over the entire circumference (the O-ring on the front side block 14 side is not shown), and the front side block 14 side A suction chamber (not shown) formed between the front head 3 and the housing 2 and a discharge chamber 17 formed in the housing 2 on the rear side block 15 side are partitioned in an airtight manner.

  On the outer end face of the rear side block 15, an oil separator 18 formed integrally with an oil separator block 19 (see FIG. 5A) is installed so as to be positioned in the discharge chamber 17.

  The front side block 14 is fastened and fixed to the inner peripheral surface around the opening end of the front head 3 with a plurality of bolts. On the other hand, as shown in FIG. 1, the rear side block 15 has an end portion on the outer peripheral surface (the oil separator 18 side with respect to the O-ring 16 installed along the outer peripheral surface) on the inner peripheral surface 2 a ( It is press-fitted (fitted) into the press-fitting part C) shown in FIG. Thus, the compressor main body 4 housed in the housing 2 is fastened and fixed to the front head 3 by the bolts on the front side block 14 side, and the rear side block 15 side is press-fitted (fitted) to the inner peripheral surface 2 a of the housing 2. It is held like that.

  The inner diameter of the inner peripheral surface 2a of the housing 2 in the vicinity of the press-fitting portion C shown in FIG. 1 is slightly smaller than the inner diameter of the portion where the compressor body 4 is disposed (opening side of the housing 2).

  The electromagnetic clutch 5 is installed on the outer surface side of the front head 3, and the rotational driving force of the engine is transmitted to the pulley 20 via a belt (not shown). One end side (left side in FIG. 2) of the rotating shaft 10 is fitted in the central through hole of the armature 21 of the electromagnetic clutch 5. The rotating shaft 10 is pivotally supported by the central through holes of the front side block 14 and the rear side block 15.

  During operation of the compressor 1 (compressor main body 4), the armature 21 is attracted to the side surface of the pulley 20 by excitation of an electromagnet (not shown) in the pulley 29, so that the pulley 20 is passed through a belt (not shown). Is transmitted to the rotary shaft 10 (rotor 11) via the armature 21.

(Configuration and operation of compressor body 4)
As shown in FIG. 3, in the space between the inner peripheral surface 12a of the cylinder 12, the outer peripheral surface 11a of the rotor 11, and both side blocks 14, 15 (see FIG. 2), five vanes installed at equal intervals. A plurality of compression chambers 22 a and 22 b partitioned by 13 are formed.

  Each vane 13 is slidably installed in a vane groove 23 formed in the rotor 11, and outwards from the outer peripheral surface 11 a of the rotor 11 due to back pressure by refrigerating machine oil supplied to the bottom of the vane groove 23. Protrusively. In FIG. 3, the compression chamber formed in the upper space between the inner peripheral surface 12a of the cylinder 12 and the outer peripheral surface 11a of the rotor 11 is referred to as a compression chamber 22a, and the compression chamber formed in the lower space. Is a compression chamber 22b.

  The cylinder 12 has an inner peripheral surface 12 a having a substantially elliptical cross-sectional contour that surrounds the outer periphery 11 a of the rotor 11. Each of the compression chambers 22a and 22b repeatedly increases and decreases in volume in the refrigerant gas suction process and the compression process as the rotor 11 rotates. In addition, the compressor 1 (compressor main body 4) of this embodiment has the suction | inhalation process and compression process of 2 times, while the rotor 11 carries out 1 rotation.

  The cylinder 12 discharges the suction holes (not shown) for sucking the refrigerant gases a1 and a2 into the compression chambers 22a and 22b and the refrigerant gases b1 and b2 compressed in the compression chambers 22a and 22b. The discharge holes 24a and 24b are provided.

  Specifically, in the process of increasing the volume of the compression chambers 22a and 22b, low-pressure refrigerant gas is sucked into the compression chambers 22a and 22b through the respective suction holes (not shown) formed in the front side block 14, and the volume is increased. In the process of decreasing the refrigerant gas, the refrigerant gas confined in the compression chambers 22a and 22b is compressed, whereby the refrigerant gas becomes high temperature and high pressure. The high-temperature and high-pressure refrigerant gases b1 and b2 pass through the discharge holes 24a and 24b into the discharge chambers 25a and 25b, which are spaces surrounded by the cylinder 12, the housing 2, and the side blocks 14 and 15, respectively. Discharged.

  Each discharge chamber 25a, 25b is provided with a discharge valve 26 for preventing the refrigerant gas from flowing back to the compression chambers 22a, 22b, and a valve support 27 for preventing excessive deformation (warping) of the discharge valve 26. . The high-temperature and high-pressure refrigerant gas discharged from the discharge holes 24a and 24b to the discharge chambers 25a and 25b is discharged from the discharge ports 28a and 28b formed in the rear side block 15 into discharge gas passages 29a and 29b described later (see FIG. 4). And is introduced into an oil separator 18 provided in the discharge chamber 17. As shown in FIG. 1, the discharge holes 24 a and 24 b are arranged in parallel along the longitudinal direction of the rotor 11 (the axial direction of the rotating shaft 10).

  The oil separator 18 uses a centrifugal force to extract refrigeration oil mixed with refrigerant gas (vane back pressure oil leaked from the vane groove 23 formed in the rotor 11 to the compression chambers 22a and 22b) from the refrigerant gas. To separate. Specifically, a high-pressure refrigerant gas is discharged from the compression chambers 22a and 22b to the discharge holes 24a and 24b, and the oil separator 18 passes through the discharge chambers 25a and 25b, the discharge ports 28a and 28b, and the discharge gas passages 29a and 29b. When introduced into the inside, the refrigerant gas is spirally swirled along the inner peripheral surface of the oil separator 18, and the refrigeration oil mixed with the refrigerant gas is centrifuged.

  As shown in FIG. 1, the refrigerating machine oil R separated from the refrigerant gas in the oil separator 18 is accumulated at the bottom of the discharge chamber 17, and the high-pressure refrigerant gas G after the refrigerating machine oil is separated is discharged from the discharge chamber 17. And discharged to a condenser (not shown) through a discharge port 8 (see FIG. 2).

  The refrigerating machine oil R that accumulates at the bottom of the discharge chamber 17 is oil passages, salai grooves (not shown), etc. formed in both side blocks 14 and 15 due to the high-pressure atmosphere of the high-pressure refrigerant gas discharged into the discharge chamber 17. Is supplied to the vane groove 23 for back pressure.

(Structure of the discharge gas passages 29a and 29b)
Hereinafter, the discharge gas passages 29a and 29b formed in the rear side block 15, which is a feature of the present invention, will be described with reference to FIGS.

  FIG. 4 is a perspective view showing the outer end face side of the rear side block 15, and FIG. 5A is a view showing the appearance of the oil separator 18 (oil separator block 19) provided on the outer end face of the rear side block 15. 5 (b) is a view showing the back side of the oil separator block 19, and FIG. 6 is a sectional view taken along line BB in FIG. FIG. 4 shows a state in which the oil separator 18 (oil separator block 19) is removed from the outer end face of the rear side block 15.

  As shown in FIG. 4, concave discharge gas passages 29a and 29b are formed on the outer end surface 15a of the rear side block 15 so as to extend from the discharge ports 28a and 28b on both sides to the vicinity of the upper center. The opposite sides of the discharge gas passages 29 a and 29 b to the discharge ports 28 a and 28 b merge in the vicinity of the upper center of the outer end surface 15 a of the rear side block 15. In FIG. 4, reference numeral 15 denotes an O-ring groove 15 c formed along the circumferential direction of the outer peripheral surface 15 b of the rear side block 15, and an O-ring 16 (see FIGS. 1 and 6) in the O-ring groove 15 c. ) Is arranged.

  As shown in FIG. 5A, an oil separator block 19 integrally formed with an oil separator 18 is fastened and fixed to the outer end surface 15a of the rear side block 15 with a plurality of bolts. As shown in FIG. 5 (b), the oil separator block 19 has a rear surface (a surface in contact with the outer end surface 15a of the rear side block 15), as shown in FIG. 5B, the discharge ports 28a and 28b and the discharge gas passages 29a and 29b of the outer end surface 15a. In accordance with this position, concave groove portions 19a and 19b and a communication portion 19c communicating from the joining portion of the groove portions 19a and 19b to the upper side in the oil separator 18 are formed. In FIG. 5A, the arrow R indicates the refrigerating machine oil separated from the refrigerant gas in the oil separator 18, and the arrow G indicates the high-pressure refrigerant gas after the refrigerating machine oil is separated.

  Then, the oil separator block 19 is brought into close contact with the outer end surface 15a of the rear side block 15 by bolt fastening, so that the discharge gas passages 29a and 29b and the groove portions 19a and 19b are combined, and the discharge gas passages 29a and 29b become tubular passages. .

  Therefore, the high-pressure refrigerant gas compressed in the compression chambers 22a and 22b of the compressor body 4 passes through the discharge holes 24a and 24b, the discharge ports 28a and 28b, the discharge gas passages 29a and 29b, and the communication portion 19c. 18 is discharged.

  By the way, in this embodiment, as shown in FIGS. 4 and 6, the discharge gas passage 29 a has a bottom surface 29 a ′ (see FIG. 6) outside the outer end surface 15 a of the rear side block 15 (oil separator 18 side). Is formed in a concave shape by the protruding portions 29a1, 29a2 on both sides. That is, the bottom surface 29a ′ of the discharge gas passage 29a is pressed from the press-fitted portion C of the outer peripheral surface 15b of the rear side block 15 (the portion that is press-fitted into the inner peripheral surface 2a of the housing 2 and the portion on the outer end surface 15a side of the outer peripheral surface 15b). Is also located outside (oil separator 18 side).

  The press-fitting portion C is located on the outer end surface 15a side (oil separator 18 side) of the O-ring 16 in the O-ring groove 15c formed along the substantially central peripheral surface of the outer peripheral surface 15b of the rear side block 15. ing. FIG. 6 shows one discharge gas passage 29a, but the same applies to the other discharge gas passage 29b.

  Thus, the rear side block 15 of the present embodiment is thicker at the discharge gas passages 29a and 29b than at the other portions, and has high rigidity.

  Then, when the outer peripheral surface 15b (press-fit portion C) of the rear side block 15 of the compressor body 4 is press-fitted into the inner peripheral surface of the housing 2, as shown in FIG. A force F in the direction toward the discharge chamber 17 in the housing 2 (the right direction in FIG. 6) acts. At this time, since the discharge gas passages 29a and 29b are formed so as to protrude outward from the outer end surface 15a of the rear side block 16, the thickness of the discharge gas passages 29a and 29b is thicker than the other portions. The rigidity of the rear side block 15 is high.

  Therefore, when the outer peripheral surface 15b (press-fit portion C) of the rear side block 15 of the compressor body 4 is press-fitted into the inner peripheral surface of the housing 2, the bending toward the compression chambers 22a and 22b (the side opposite to the discharge chamber 17) is performed. Moments do not act. Thereby, deformation | transformation does not arise in the rear side block 15, but the clearance gap between the end surfaces (end surface by the side of the rear side block 15) of the rotor 11 can be kept constant.

  On the other hand, conventionally, as shown in FIG. 7, the discharge gas passage 29 a is formed such that its bottom surface 29 a ′ is located inside the outer end surface 15 a of the rear side block 15. That is, the bottom surface 29a ′ of the discharge gas passage 29a is pressed from the press-fitted portion C of the outer peripheral surface 15b of the rear side block 15 (the portion that is press-fitted into the inner peripheral surface 2a of the housing 2 and the portion on the outer end surface 15a side of the outer peripheral surface 15b). Is also located inside. That is, in the conventional rear side block 15, the thickness of the discharge gas passages 29a and 29b is thinner than the other portions, and the rigidity of the discharge gas passages 29a and 29b is low.

  Then, when the outer peripheral surface 15b (press-fit portion C) of the rear side block 15 of the compressor body 4 is press-fitted into the inner peripheral surface of the housing 2, as shown in FIG. A force F in the direction toward the discharge chamber 17 in the housing 2 (the right direction in FIG. 7) acts. At this time, since the rigidity in the portions of the discharge gas passages 29a and 29b is low, the compression chambers 22a and 22b side (discharge A bending moment in the direction opposite to the chamber 17 may act, and the center side of the rear side block 15 may be deformed so as to be convex toward the compression chambers 22a and 22b (opposite the discharge chamber 17).

  When the rear side block 15 is deformed so that the center side of the rear side block 15 is convex toward the compression chambers 22a, 22b (opposite to the discharge chamber 17), the end surface of the rotor 11 in the compressor body 4 (end surface on the rear side block 15 side) There is a possibility that a gap having a predetermined width formed therebetween decreases, and the center side of the inner end face of the rear side block 15 comes into contact with the end face of the rotor 11.

1 Compressor (gas compressor)
2 Housing 3 Front head 4 Compressor body 11 Rotor 12 Cylinder 13 Vane 14 Front side block 15 Rear side block 15a Outer end face 18 Oil separator 19 Oil separator block 28a, 28b Discharge port 29a, 29b Discharge gas passage (discharge medium passage)

Claims (3)

A compressor main body that compresses the supplied medium and discharges the compressed high-pressure medium;
Two side blocks that respectively block both end faces of the compressor body;
An oil separator that is provided on the outer end face side of one of the side blocks, and that separates oil components mixed from the discharge medium discharged from the discharge port formed in the side block from the compressor body;
The compressor main body and the oil separator are housed inside, and an outer peripheral surface of the one side block is press-fitted into an inner peripheral surface of the housing to hold and fix the compressor main body. And
A concave discharge medium passage for introducing a discharge medium from the discharge port to the oil separator is formed on the outer end surface of the one side block,
The gas compressor, wherein the discharge medium passage is formed closer to the oil separator than a position where the outer peripheral surface of the one side block is press-fitted into the inner peripheral surface of the housing.   An O-ring groove in which an O-ring is installed is formed in a circumferential direction on the outer peripheral surface of the one side block, and the oil separator of the O-ring groove on the outer peripheral surface of the one side block The gas compressor according to claim 1, wherein a side is press-fitted into the inner peripheral surface of the housing. The oil separator is formed integrally with the oil separator block, and the oil separator block is fixed to the outer end surface of the one side block;
3. The concave groove portion is formed on the outer end face side surface of the one side block of the oil separator block in accordance with the position of the discharge medium passage. Gas compressor.