JP4142863B2 - Gas compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas compressor used in a car air conditioner system and the like, and in particular, can improve the durability and cooling capacity of the device and save power.
[0002]
[Prior art]
Conventionally, this kind of gas compressor has a cylinder 4 having an inner peripheral elliptical shape as shown in FIGS. 4 and 5, for example, and side blocks 5 and 6 are screwed and joined to both end faces of the cylinder 4. Is adopted.
[0003]
A rotor 7 is rotatably arranged in the cylinder 4, and a vane 12 is mounted in a vane groove 11 formed in the rotor 7. The vane 12 can slide in the vane groove 11, and the rotor 7 From the outer peripheral surface of the cylinder 4 toward the inner peripheral surface of the cylinder 4.
[0004]
The small chamber inside the cylinder 4 partitioned by the cylinder 4, the side blocks 5 and 6, the rotor 7 and the vane 12 is referred to as a compression chamber 13, and the compression chamber 13 repeats the change in volume by the rotation of the rotor 7. Due to this volume change, low-pressure refrigerant gas is sucked from the suction chamber 14 side, compressed, and discharged as high-pressure refrigerant gas to the discharge chamber 15 side.
[0005]
An oil reservoir 20 on which the discharge pressure of the high-pressure refrigerant gas acts is provided at the bottom of the discharge chamber 15, and the oil in the oil reservoir 20 passes through the side blocks 5, 6, the oil holes 21 of the cylinder 4, etc. It is supplied to the bottom of the groove 11 and used as a vane back pressure that presses the vane 12 toward the inner wall side of the cylinder 4. Further, the oil supplied to the bottom of the vane groove 11 leaks to the rotor end surface 7 a (also referred to as “rotor side”) to form an oil film, and the oil film slides between the rotor side 7 a and the side blocks 5 and 6. The moving gap (also referred to as “rotor side clearance”) is sealed.
[0006]
By the way, in the gas compressor having the structure as described above, the inner surface of the rear side block 6 facing the rotor end surface 7a and the cylinder end surface 4a is not a flat surface as shown in FIG. The central portion is formed to have a concave curved shape with a slight depression. The same applies to the inner surface of the side block 5 on the front side. The reason why the side surfaces of the side blocks 5 and 6 are formed in a concave curved surface is to secure the rotor side clearance and to secure the oil film of the rotor side 7a.
[0007]
However, according to the gas compressor having the conventional structure as described above, since the entire inner side surfaces of the side blocks 5 and 6 are formed as concave curved surfaces as shown in FIG. , 6 and the cylinder end surface 4a having a planar shape are abutted with each other, the gap G1 shown in FIG. For this reason, when the cylinder 4 and the side blocks 5 and 6 are fastened and screwed as they are, the center portion of the side blocks 5 and 6 is the rotor as shown in FIG. 7 because of the fastening force and the shape of the gap G1. 7 is deformed so as to project toward the end face of the cylinder 7, and the cylinder 4 is deformed into a drum shape. Thereby, the concave amount of the concave curved surface shape of the inner surfaces of the side blocks 5 and 6 is reduced, and it becomes difficult to secure the rotor side clearance and the oil film of the rotor side 7a, and the durability as a gas compressor, particularly the wear resistance is lowered. In addition, the sliding frictional resistance between the rotor end surface 7a and the side blocks 5 and 6 increases, and there is a problem that a large amount of power is required for the operation of the gas compressor. When the cylinder 4 is deformed in a drum shape as described above, an unnecessary gap G2 is generated between the tip of the vane 12 and the cylinder 4, and the high-pressure refrigerant gas in the compression chamber 13 leaks from the gap G2 to the low-pressure part side. There are also problems such as an increase in the amount of so-called internal leakage and a decrease in cooling capacity.
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and its object is to improve the durability and cooling capacity as well as to save power by preventing the deformation of the cylinder and the side block by screwing and fastening. It is providing the gas compressor which aimed at.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises an inner circumferential elliptical cylinder, a front side block and a rear side block that are screwed and joined to an end surface of the cylinder, a rotor shaft that is integrally provided on the axis thereof, and the above A rotor disposed rotatably in the cylinder by a bearing located at the center of the front side block and the rear side block, and a vane provided so as to protrude from the outer peripheral surface of the rotor toward the inner peripheral surface of the cylinder; It consists of a small chamber inside the cylinder that is partitioned by the cylinder, both side blocks, the rotor, and the vanes. The volume of the cylinder is repeatedly changed by the rotation of the rotor, and the low-pressure refrigerant gas is sucked and compressed by the volume change. A compression chamber for discharging, and an inner surface of the front side block or both side blocks Among the body, the rotor sliding portion where the rotor end face in sliding contact, a concave shape when viewed from the rotor end face, the end face of the cylinder and the planar shape, the cylinder joint portion joined to the end surface of the cylinder, the The connecting portion connecting the rotor sliding contact portion and the cylinder joint portion has the same planar shape as the cylinder end surface, and has a planar shape as an extension surface of the cylinder joint portion .
[0010]
Here, “the concave shape when viewed from the rotor end surface side” includes a shape in which the concave portion is a curved surface (hereinafter referred to as “concave curved shape”), and a shape in which the concave portion is not a curved surface but a straight line. In addition, the above “the same shape as the end face of the cylinder” means that when the end face of the cylinder is a plane, it is the same plane shape, and when the end face of the cylinder is a curved face, it has the same curved shape. It means that there is.
[0011]
In the present invention, by adopting the above-described configuration in which the cylinder joint portion of the side block has the same shape as the end face of the cylinder, the joint portion of the side block and the cylinder has a structure in which the same shape is joined. Before the screw joint, there is no gap generated in the joint portion, and this type of gap, that is, the deformation of the cylinder and the side block due to the screw fastening is prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a gas compressor according to the present invention will be described in detail with reference to FIGS. 1 to 3. The same parts as those in the prior art will be described with reference to FIGS.
[0016]
As shown in FIG. 4, the gas compressor of this embodiment has a structure in which a compression mechanism portion 2 is housed in a compressor case 1 having an one-end opening type, and a front head 3 is attached to the opening end of the compressor case 1. ing.
[0017]
The compression mechanism section 2 has an inner circumferential elliptical cylinder 4, and side blocks 5 and 6 are screwed and joined to both end faces of the cylinder 4, and a rotor 7 is disposed in the cylinder 4.
[0018]
The rotor 7 is rotatably supported by a rotor shaft 8 provided integrally with the shaft center and bearings 9 and 10 of side blocks 5 and 6 that support the rotor shaft 8. Further, as shown in FIG. 5, the rotor 7 has five vane grooves 11 radially formed in the radial direction thereof, and each vane 12 is attached to each of the vane grooves 11 one by one. Each vane 12 is slidable in the vane groove 11 and is provided so as to protrude from the outer peripheral surface of the rotor 7 toward the inner peripheral surface of the cylinder 4.
[0019]
The inside of the cylinder 4 is partitioned into a plurality of small chambers by the inner wall of the cylinder 4, the inner surfaces of the side blocks 5 and 6, the outer peripheral surface of the rotor 7, and both side surfaces on the tip end side of the vane 12. Yes, the compression chamber 13 repeats the change in volume as the rotor 7 rotates in the direction of arrow A in the figure, and the volume change sucks the low-pressure refrigerant gas in the suction chamber 14, which is a low-pressure chamber, and compresses it. The high-pressure refrigerant gas is discharged to the discharge chamber 15 side which is a high-pressure chamber.
[0020]
That is, when the volume of the compression chamber 13 changes, the low-pressure refrigerant gas in the suction chamber 14 flows into the suction port (not shown) of the side block 5 or the suction passage 4a of the cylinder 4 and the suction port of the side block 6 when the volume increases. The air is sucked into the compression chamber 13 through 6a. When the volume of the compression chamber 13 starts to decrease, the refrigerant in the compression chamber 13 starts to be compressed due to the volume reduction effect. Thereafter, when the volume of the compression chamber 13 approaches the minimum, the reed valve 17 of the cylinder discharge hole 16 provided in the vicinity of the cylinder elliptical short diameter portion is opened by the compressed high-pressure refrigerant gas pressure. Thereby, the high-pressure refrigerant gas in the compression chamber 13 is discharged from the cylinder discharge hole 16 to the discharge chamber 18 in the external space of the cylinder, and is further guided from the discharge chamber 18 to the discharge chamber 15 side through the oil separator 19 and the like.
[0021]
Also in the gas compressor of the present embodiment, an oil reservoir 20 on which the discharge pressure of the high-pressure refrigerant gas acts is provided at the bottom of the discharge chamber 15, and the oil in the oil reservoir 20 is stored in the side blocks 5, 6 and It is supplied to the bottom of the vane groove 11 through the oil hole 21 of the cylinder 4, the bearing 9, 10 clearance, etc., and is used as a vane back pressure that presses the vane 12 toward the inner wall side of the cylinder 4. Further, the oil supplied to the bottom of the vane groove 11 leaks to the rotor side to form an oil film, and the rotor side clearance is sealed by this oil film. The high-pressure refrigerant gas discharged into the discharge chamber 18 as described above contains oil for lubrication or the like in a mist state, and the oil component in the high-pressure refrigerant gas passes through the oil separator 19. At the same time, it is separated and captured and dropped into the oil reservoir 20 at the bottom of the discharge chamber 15 to be temporarily stored.
[0022]
By the way, in the case of the conventional gas compressor, the shape of the inner surfaces of the side blocks 5 and 6 facing the cylinder end surface 4a and the rotor end surface 7a is a concave curved surface as a whole (see FIG. 6). In the case of the gas compressor of the embodiment, the shape of the inner side surface of the rear side block (rear side block) 6 is, as shown in FIG. 1, a concave curved surface recessed in a mortar shape and a plane continuously provided on the outer edge thereof. Is a two-surface shape. The shape of the inner side surface of the front side block (front side block) 5 is the same.
[0023]
In other words, in the present embodiment, the rotor sliding contact portion b with which the rotor end surface 7a is opposed and slidably contacted among the entire inner surfaces of the front and rear side blocks 5, 6 has a concave shape when viewed from the end surface side of the rotor 7 ( In this embodiment, the cylinder joint portion c is formed so as to be a concave curved surface shape), and is opposed to and joined to the end face of the cylinder 4 among the other portions, that is, the entire inner surfaces of the side blocks 5 and 6. Is formed to have the same shape as the end face of the cylinder 4 (planar shape in the present embodiment).
[0024]
Therefore, in the gas compressor of the present embodiment, when assembling the equipment, the inner surfaces of the side blocks 5 and 6 are abutted and screwed to the end surface 4a of the cylinder 4, and the side block 5, 6 The inner side surface and the cylinder end surface 4a are structured such that the same planes are joined to each other, and since these are the same joined structures to each other, before the cylinder 4 and the side blocks 5 and 6 are screwed together, Thus, a conventional gap (see reference numeral G1 in FIG. 6) does not occur.
[0025]
For this reason, according to the gas compressor of this embodiment, when the cylinder 4 and the side blocks 5 and 6 are screwed and joined, the central portion of the side blocks 5 and 6 faces the end surface 7a of the rotor 7 as in the prior art. There is no overhanging deformation or the cylinder 4 is deformed in a drum shape, the deformation of the side blocks 5 and 6 and the cylinder 4 due to screw fastening is reduced, and the concave curved surfaces of the side surfaces of the side blocks 5 and 6 are reduced. The shape remains the same as before the screw fastening. The rotor side clearance (sliding gap between the rotor end surface 7a and the side blocks 5 and 6) is thus formed by the concave curved shape portions of the inner side surfaces of the side blocks 5 and 6 whose shape does not change even after screwing and fastening. The oil film can be sufficiently secured and a sufficient oil film can be secured on the rotor side (rotor end surface 7a), and the oil film can surely lubricate the sliding contact portion between the rotor end surface 7a and the side blocks 5 and 6. Further, durability as a gas compressor, particularly wear resistance, is improved, and sliding friction resistance at the sliding contact portion is reduced, so that power required for operation of the gas compressor can be reduced.
[0026]
Further, according to the gas compressor of the present embodiment, the drum-like deformation of the cylinder 4 is prevented as described above, so that an unnecessary gap (reference numeral G2 in FIG. 7) is provided between the tip of the vane 12 and the cylinder 4 as in the prior art. The high-pressure refrigerant gas in the compression chamber 13 leaks to the low-pressure part (suction chamber) side through this type of gap, so that the so-called internal leak amount can be reduced, and the cooling capacity can be improved. .
[0027]
In the above embodiment, of the inner surfaces of the side blocks 5 and 6, the connecting portion d that connects the concave curved rotor sliding contact portion b and the planar cylinder joining portion c is used as the rotor sliding contact portion b. Although the curved surface is adopted as the extended surface (see FIG. 1), the connecting surface d can be a planar shape as the extended surface of the cylinder joint c as shown in FIG.
[0028]
In addition to the above-described embodiment, for example, a deformation preventing structure as shown in FIG. 3 can be adopted as a means for preventing the deformation of the cylinder 4 and the side blocks 5 and 6 by screwing and fastening. The structure of this figure has a concave shape when viewed from the rotor end surface 7a side, specifically, a concave curved surface shape where the central portion is depressed when viewed from the rotor end surface 7a side. The side block joint portion a of the cylinder 4 to which the side blocks 5 and 6 are joined has the same shape as the concave shape of the inner side surfaces of the side blocks 5 and 6, specifically, the concave curved surface shape of the inner side surfaces of the side blocks 5 and 6. Is a curved surface shape with the same curvature. According to the structure shown in FIG. 3, since the curved surfaces having the same curvature are joined to each other at the joint portions of the side blocks 5 and 6 and the cylinder end surface 4a, the cylinder 4 and the side block 5, No unnecessary gap (refer to reference numeral G1 in FIG. 6 and reference numeral G2 in FIG. 7) is generated before and after the screwing connection in FIG. 6, and thus the deformation preventing structure in FIG. The same effects as in the embodiment, that is, improvement in durability and cooling capacity of the gas compressor and power saving can be achieved.
[0029]
【The invention's effect】
In the gas compressor according to the present invention, as described above, the cylinder joint portion of the side block has the same shape as the end surface of the cylinder, or the side block joint portion of the cylinder has the same shape as the concave shape of the side block. It adopts the configuration to do. For this reason, since the joint part of a side block and a cylinder becomes the structure where the same shape is joined, before the screwing joining of a cylinder and a side block, a clearance gap does not arise in the junction part. This prevents conventional defects, that is, deformation of the shape due to screwing of the side block and cylinder, and ensures sufficient rotor side clearance and oil film on the rotor side, improving the durability and cooling capacity as a gas compressor. In addition, power saving can be achieved.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of a main part of a gas compressor according to the present invention.
FIG. 2 is an explanatory diagram of a modified example of the embodiment shown in FIG.
FIG. 3 is an explanatory view showing another embodiment of the main part of the gas compressor according to the present invention.
FIG. 4 is a cross-sectional view showing a basic configuration of a gas compressor.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is an explanatory diagram of the structure of a joint between a cylinder and a side block in a conventional gas compressor.
7 is an explanatory view showing a state of shape deformation of the cylinder and the side block when the conventional cylinder and the side block shown in FIG. 6 are screwed and joined. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Compressor case 2 Compression mechanism part 3 Front head 4 Cylinder 4a Cylinder end surface 5 Front side block 6 Rear side block 7 Rotor 7a Rotor end surface (rotor side)
8 Rotor shaft 9, 10 Bearing 11 Vane groove 12 Vane 13 Compression chamber 14 Suction chamber (low pressure chamber)
15 Discharge chamber (high pressure chamber)
16 Cylinder discharge hole 17 Reed valve 18 Discharge chamber 19 Oil separator 20 Oil reservoir 21 Oil hole a Cylinder side block joint b Side block rotor sliding contact c Side block cylinder joint

Claims (1)

An inner circumferential elliptical cylinder;
A front side block and a rear side block which are screwed and joined to the end face of the cylinder;
A rotor rotatably disposed in the cylinder by a rotor shaft provided integrally with the shaft center and a bearing located at the center of the front side block and the rear side block;
A vane provided so as to be able to protrude from the outer peripheral surface of the rotor toward the inner peripheral surface of the cylinder;
It consists of a small chamber inside the cylinder that is partitioned by the cylinder, both side blocks, the rotor, and vanes, and the volume of the cylinder is repeatedly changed by the rotation of the rotor. A compression chamber for discharging,
Of the entire inner side surface of the front side block or both side blocks, the rotor sliding contact portion with which the rotor end surface is in sliding contact has a concave shape when viewed from the rotor end surface side,
The end face of the cylinder has a planar shape,
The cylinder joint to be joined to the end face of the cylinder has the same planar shape as the cylinder end face
Connecting portion connecting between said rotor sliding portion and the cylinder joint, the gas compressor is characterized in that a planar shape as an extension surface of the cylinder joint.

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