JPH0442554Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a gas compressor, and particularly relates to an improvement of a gas compressor suitable for car coolers and other relatively small-sized refrigeration equipment.

<Prior Art> A conventional rotary vane type gas compressor has a solid cylindrical rotor in which a plurality of vanes that can move forward and backward in the radial direction are attached to a cylinder block with an approximately elliptical inner circumference provided within a casing. is suspended horizontally so that it can rotate freely.

A compression work chamber is formed in a crescent-shaped space surrounded by the inner wall of the cylinder block and the outer peripheral wall of the solid cylinder, and when the vane rotates within this compression work chamber, gas (refrigerant gas) is sucked into the compression work chamber. At the same time, the following vane acts to compress the gas sucked in by the previous vane.

<<Problem to be solved by the invention>> Incidentally, in recent years, with the miniaturization of refrigeration equipment, etc., there has been a demand for increasingly smaller gas compressors. In particular, gas compressors installed in cars are installed in the engine room, so
In order to avoid interference with other devices, there is an increasing demand for smaller devices with smaller girths.

However, in a gas compressor, in order to obtain initial cooling performance, the capacity of the compression working chamber is determined in advance, and the major axis and minor axis of the cylinder chamber are determined based on this. Therefore, the external shape of the cylinder block is necessarily determined by taking into account the wall thickness that can withstand compression work and the machining space for the front side positioning pin holes and mounting holes that are attached to the end face of the cylinder block. The outer shape of the casing surrounding the block is also necessarily determined.

As described above, since the compressor is designed to be the most compact, there is a problem in that it is difficult to manufacture a gas compressor smaller than this size.

《Means for solving the problem》 The present invention was developed as a result of intensive research on the wall thickness of the cylinder block in view of the above-mentioned problems, and was developed to fully withstand compressed gas pressure even though the capacity of the compression work chamber remains unchanged. We were able to complete a small gas compressor with a flexible cylinder shape. The gas compressor consists of a cylinder block whose inner periphery is approximately elliptical, a cylinder chamber formed by front and rear side blocks attached to both sides of the cylinder block, and a cylinder that can freely rotate horizontally within the cylinder chamber. A rotor having a plurality of vanes that are suspended and movable back and forth in a plurality of vane grooves provided in the radial direction, and a casing that forms a space at the rear of the rear side block and surrounds the cylinder block and both side blocks. In a rotary vane type gas compressor that compresses gas sucked in from the intake side in a cylinder chamber and then discharges it, the cylinder block has a wall thicker around the front side block side than other parts. At the same time, an assembly hole such as a positioning pin hole for mounting the front side block or a mounting screw hole is bored on the end face of the step on the front side block side at a predetermined distance from the inner wall of the cylinder. The casing on the rear side block side with the stepped portion as a boundary is provided with a constricted portion that is recessed toward the cylinder block side.

《Operation》 In this invention, the front side block side of the cylinder block is made thicker than other parts, and this thick part is provided with a positioning pin hole and an assembly screw hole. Side blocks are installed.

《Description of Examples》 Fig. 1 is a longitudinal sectional view of a gas compressor according to the present invention, and Fig. 2 is a sectional view taken along the - line in Fig. 1.
The gas compressor includes a casing 1 with one end open,
A front head 2 is provided to be attached to the open end surface of the casing 1.

Inside the casing 1 are a cylinder block 3 with an inner circumference approximately elliptic cylindrical, and a pair of side blocks consisting of a front side block 4 and a rear side block 5 on both sides of this cylinder block 3. A cylinder chamber a is formed in the cylinder chamber a, and a cylinder chamber 5 is formed in the cylinder chamber a, which is integral with the rotor shaft 6 and can freely move forward and backward in the radial direction around the rotor shaft 6.
A solid cylindrical rotor 8 equipped with a plurality of flat plate-shaped vanes 7 is horizontally suspended so as to be freely rotatable.

The vane 7 is attached to the rotor 8 by a vane groove 8a that extends around the rotor 8 in the direction of its rotation axis, has a cross section slightly larger than the cross section of the vane 7, and has a depth slightly larger than the height of the vane 7.
This is done by providing a vane groove 8a and inserting the vane 7 into this vane groove 8a.

The outer periphery of the cylinder block 3 on the front side block 4 side is formed with a stepped portion 9 having a slightly larger diameter than the other outer peripheries. Further, the casing 1 has a constricted portion 1a that is recessed toward the cylinder block 3 side, and this constricted portion 1a is provided in a range from the stepped portion 9 of the cylinder block 3 to the rear side block 5. The length of the stepped portion 9 is approximately equal to the depth of a positioning pin hole provided in the end face of the cylinder block 3 on the front sandblock 4 side.

The positioning pin holes 11, 11 are located in the cylinder chamber a.
Further, on the end face of this cylinder block 3, assembly screw holes (mounting holes) 12, 12, . Oil flow holes 3a are opened, which are spaced apart from each other, and through which lubricating oil O stored in the rear space a of the casing 1 flows.

The opening positions of the positioning pin holes 11, 11 are formed to have wall thicknesses h and h' sufficient to withstand deformation and breakage during processing and assembly from the inner wall of the cylinder chamber a and the cylinder outer periphery. Therefore, the thickness of this outer periphery forms the stepped portion 9.

In addition, the wall thickness of the assembly screw holes 12, 12... and the oil flow holes 3a, 3a is opened at a location other than the long axis Y-Y of the cylinder chamber a, so the wall thickness of the positioning pin holes 11, 11 is Since the thickness is greater than h, there is no need to worry about strength.

A rear side block 5 is fixed to one end face of the cylinder block 3 with screws in the same way as the front side block 4. Although the screw holes for this are not shown, the cylinder chamber a has a long diameter Y- The cylinder block 3 on this end surface side does not have a stepped portion because it is provided at a position outside Y and no positioning pin hole is provided in its long diameter portion.

To assemble the gas compressor, after attaching the rear side block 5 to the cylinder block 3 using a jig while centering it, the rotor 8 and vane 7 are inserted. Next, the front side block 4 is attached to the cylinder block 3 using the positioning pin hole 11 as a guide, and then fixed with the attachment screw 13. In addition, the oil separator mounting piece 1 is attached to the rear side block 5.
4 is fixed with screws, and the rotor shaft 6 protruding from the front side block 4 is passed through the opening of the front head 2 and fixed with screws to the opening of the casing 1. The built-in pulley 16 is attached and assembled.

In the gas compressor configured in this way, when the rotor 8 rotates to start compressing gas, the rotation of the vane 7 causes the gas on the suction side to move to the initial position when the vane 7 is located in the cylinder chamber a and begins to move. During the suction process, it is introduced into the suction chamber 18 through the suction hole 17 provided in the front head 2.

Furthermore, as shown by arrow A in FIG. cylinder chamber a from the notches 21a and 21b
sucked inside.

Next, when the vane 7 rotates to enter the compression process, the compressed refrigerant gas passes through the discharge port 22, the discharge valve 23, the communication hole provided in the rear side block 5, and the oil separator provided at the back of the rear side block 5. 24, where the oil is separated, and then reaches the rear space b of the casing 1, as shown by the arrow B in FIG. 1, and is further discharged to the outside through the discharge hole 25.

Since oil O for lubricating oil is stored in the rear space b of the casing 1, this oil O flows through the oil circulation holes 5a, 3a, and 3a formed in the rear side block 5, cylinder block 3, and front side block 4, respectively. 4a to the rotor shaft 6 to perform a lubricating action, and the oil O that has performed this lubricating action is supplied to the bottom of the vane groove 8a provided in the rotor 8 to move the vane 7 against the inner wall of the cylinder chamber a. This generates an extrusion force, that is, vane pressure.

Therefore, according to the above-mentioned embodiment, it goes without saying that the front side block can be attached to the cylinder block through the assembly hole as before. Compared to the conventional body circumference shown by the two-dot chain line in Figure 1, the waist is thinner at the waist, so the gas compressor can be made smaller.

In addition, since the surface area of the end face of the cylinder block on which the stepped portion 9 is formed is increased, the positioning pin hole for attaching the front side block 4 can be provided away from the cylinder chamber a. When installing the
There is no risk of adverse effects such as mounting distortion within the cylinder chamber a.

Furthermore, since the contact area between the cylinder block 3 and the front sand block 4 becomes larger, there is an effect of improving the sealing performance between the oil circulation hole 3a provided in the cylinder block 3 and the oil circulation hole 4a provided in the front side block 4. .

The present invention can also be applied to a variable capacity gas compressor in which a control plate is interposed between the cylinder block 3 and the front side block 4, thereby making the capacity of the compression chamber variable.

<<Effects>> In the present invention, as mentioned above, a stepped portion is provided on the front side block side of the cylinder block,
Since an assembly hole is drilled in the end face of this step, it goes without saying that the front side block can be attached to the cylinder block through the assembly hole as in the past. The casing on the block side has a concave part that is concave toward the cylinder block, so
The girth of the casing becomes thinner at the constriction, and the gas compressor becomes smaller accordingly, making it possible to create a small gas compressor that is suitable for installation in places with limited installation space, such as engine rooms. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a gas compressor according to the present invention, and FIG. 2 is a sectional view taken along the line -- in FIG. 1... Casing, 1a... Neck part, 2...
Front head, 3... Cylinder block, 4...
...Front side block, 5...Rear side block, 7...Vane, 8...Rotor, 8a...
Vane groove, 9...Step part, 10...Casing step part, 11...Positioning pin hole, 12...Screw hole for assembly, 13...Mounting screw, 18...Suction chamber (intake side), a... ...Cylinder chamber.

Claims (1)

[Claims for Utility Model Registration] A cylinder block whose inner periphery is approximately elliptical, a cylinder chamber formed by front and rear side blocks attached to both sides of the cylinder block, and a rotatable cylinder within the cylinder chamber. A rotor that is suspended horizontally and has a plurality of vanes that can move forward and backward in a plurality of vane grooves provided in the radial direction, and a space is formed at the rear of the rear side block, and the rotor surrounds the cylinder block and both side blocks. In a rotary vane type gas compressor, which consists of a casing and which compresses gas sucked in from the intake side in a cylinder chamber and then discharges it, the cylinder block has a wall thicker around the front side block side than other parts. At the same time, an assembly hole such as a positioning pin hole for mounting the front side block or a mounting screw hole is provided at a predetermined distance from the inner wall of the cylinder on the end face of the step on the front side block side. A gas compressor characterized in that the casing on the rear side block side with the stepped portion as a boundary is provided with a constricted portion that is recessed toward the cylinder block side.