JP2909188B2 - Fluid compressor - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial application field) The present invention relates to a fluid compressor for compressing refrigerant gas of a refrigeration cycle, for example.

(Prior Art) The applicant has proposed a fluid compressor (hereinafter referred to as a compressor) 1 of the type shown in FIG. 3 (for example, Japanese Patent Application No. 2-98432).

The compressor 1 of this type includes a compression mechanism 2 and a driving unit (not shown) such as an electric motor that rotationally drives the compression mechanism 2. Further, the compressor 1 has a cylindrical cylinder 3 and a cylindrical piston 4 as a rotating body in the compression mechanism 2. In the compressor 1, the piston 4 is eccentrically arranged in the cylinder 3, and a part of the outer peripheral surface of the piston 4 is in contact with a part of the inner peripheral surface of the cylinder 3.

Of these, the cylinder 3 has a stepped cylindrical main bearing 5 and a sub-bearing 6 inserted at both ends. And
The cylinder 3 has a suction-side end portion provided by a main bearing 5,
The discharge side ends are hermetically closed by the auxiliary bearings 6, respectively.

Further, the piston 4 is formed with a small-diameter main shaft portion 7 and a sub shaft portion 8 at both ends in the axial direction, and the main shaft portion 7 and the sub shaft portion 8 are formed into a main bearing 5 and a sub bearing 6, respectively. It is rotatably inserted. The piston 4 is supported in the cylinder 3 by the main bearing 5 and the sub bearing 6.

Further, a spiral groove 9 is formed on the outer periphery of the piston 4, and the pitch of the groove 9 is gradually reduced from the suction side to the discharge side of the cylinder 3. The piston 4 has a groove 9 into which a spiral blade 10 for partitioning a space between the outer peripheral surface of the piston 4 and the inner peripheral surface of the cylinder 3 into a plurality of pieces is fitted.

A plurality of working chambers 11 are formed between the cylinder 3 and the piston 4 and are partitioned by a blade 10 and arranged along the axial direction of the cylinder 3. And these working chambers 11
Are gradually reduced in volume from the suction chamber 12 located at the suction-side end of the cylinder 3 to the discharge chamber 13 located at the discharge-side end.

Further, the compression mechanism 2 is provided with first and second blade stoppers 14 and 15. As shown in FIGS. 4A and 4B, these blade stoppers 14 and 15
Hole for inserting blade stopper provided in cylinder 3
16 and 17 respectively, and project into the cylinder 3. The blade stoppers 14 and 15 are arranged near the end of the blade 10 and abut on the end of the blade 10 to prevent the blade 10 from moving in the circumferential direction along the groove 9.

Here, in FIG. 1, reference numeral 18 denotes a suction hole provided in the main bearing 5 for communicating the outside of the main bearing 5 and the suction chamber 12, and reference numeral 19 denotes a first blade. The discharge hole is formed concentrically with the stopper 14 and communicates the outside of the cylinder 3 with the discharge chamber 13.

That is, the compressor 1 rotates the cylinder 3 around the axis by the electric motor, and transmits the rotational force of the cylinder 3 to the piston 4 via the rotational force transmission mechanism 20. Then, the compressor 1 rotates the cylinder 3 and the piston 4 synchronously and relatively while moving the blade 10 into and out of the groove 9.

Then, the compressor 1 sequentially transfers the working fluid, such as the refrigerant gas, flowing into the suction chamber 12 through the suction hole 18 to the discharge-side working chamber 11 with the relative rotation of the cylinder 3 and the piston 4. send. The compressor 1 compresses the working fluid while sequentially sending the working fluid to the working chambers 11, and passes the high-pressure working fluid that has reached the discharge chamber 13 through a discharge hole 19 provided in the first blade stopper 14. It is discharged to the outside of the cylinder 3.

Further, the blade 10 receives a force acting from the suction side to the discharge side or from the discharge side to the suction side with the relative rotation of the cylinder 3 and the piston 4, and moves along the groove 9 in the circumferential direction of the piston 4. Try to move. But blade 10
The end of the blade stopper abuts on the first blade stopper 14 or the second blade stopper 15, and the blade stopper
14 and 15 prevent movement in the circumferential direction. And
The end of the blade 10 is prevented from contacting the end of the groove 9 and being worn.

(Problems to be Solved by the Invention) In the compressor 1 provided with the blade stoppers 14 and 15 as described above, the blade stoppers 14 and 15 need to protrude into the cylinder 3. , 15 are difficult to be integrally formed with the cylinder 3. For this reason, after the blade stoppers 14 and 15 are formed as separate parts from the cylinder 3, they are inserted into the blade stopper insertion holes 16 and 17 formed in the cylinder 3.

Also, the blade stoppers 14, 15 are shown in FIGS.
As shown in (d), a flat surface 21 is formed at a portion protruding into the cylinder 31, and the flat surface 21 is oriented perpendicular to the moving direction of the blade 10. Then, the blade stoppers 14 and 15 cause the end of the blade 10 to abut on the flat surface 21 and push the flat surface 21 along the groove 9 in the circumferential direction of the piston 4 while being pushed by the blade 10. Then, the blade 10 is stopped.

Further, if the shapes of the holes 16 and 17 for inserting the blade stopper are made to be a perfect circle, the processing of the holes 16 and 17 is easiest. However, if the shapes of the holes 16 and 17 are perfectly circular in FIGS. 5 (a) to 5 (d) and the cross-sectional shapes of the portions of the blade stoppers 14 and 15 located inside the holes 16 and 17 are also completely circular, It is conceivable that the blade stoppers 14 and 15 are rotated by being pushed by the blade 10 and the direction of the flat surface 21 is inclined.

Therefore, the shape of the holes 16, 17 and the blade stopper 14,
When the cross-sectional shape of 15 is a perfect circle, the direction of the flat surface 21 is difficult to be determined, and the blade stoppers 14 and 15 are easily displaced in the rotation direction.

An object of the present invention is to provide a fluid compressor in which the positioning of a blade stopper in the rotation direction is simple and processing and assembly are easy.

[Structure of the Invention] (Means and Actions for Solving the Problems) In order to achieve the above object, the present invention has a spiral groove with a gradually decreasing pitch from one end to the other end on the outer peripheral portion. A cylindrical rotating body in which a spiral blade is freely inserted into and out of the groove is eccentrically arranged in the cylinder, and the rotating body and the cylinder are relatively rotated to move the working fluid from the suction side to the discharge side of the cylinder. While compressing while gradually transferring to
The cylinder is provided with a blade stopper which projects into the cylinder and abuts against the end of the blade to lock the blade, and the blade stopper is inserted into a blade stopper insertion hole formed in the cylinder and connected to the cylinder. In the compressor, the shape of the hole for inserting the blade stopper is a shape outside the true circle, and the cross-sectional shape of the blade stopper is such that the blade stopper engages with the hole for inserting the blade stopper to prevent rotation. .

In addition, a concave portion is formed in a portion of the outer peripheral portion of the cylinder which is located around the hole for inserting the blade stopper, and a flange which is inserted into the concave portion and is locked to the cylinder to prevent rotation of the blade stopper. Part was provided.

Further, the present invention simplifies the positioning of the blade stopper in the rotational direction, so that the fluid compressor can be easily processed and assembled.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 (a) and 2 (c). In addition, the same numbers as those described in the section of the related art are assigned the same numbers,
The description is omitted.

FIGS. 1 (a) to 1 (c) show a main part of a first embodiment of the present invention, and 3 in FIG. 1 (a) is a cylindrical cylinder constituting a compression mechanism. . The cylinder 3 is provided with a blade stopper insertion hole 32 into which a blade stopper 31 described later is inserted.

The hole 32 has the same shape opening on the outer peripheral surface 3a and the inner peripheral surface of the cylinder 3, and penetrates the wall of the cylinder 3 linearly. Further, the hole 32 has the shape of the axis 33 of the cylinder 3.
It is set to be symmetrical oval with the center as the center. And
The hole 32 has a semicircular portion 34, 34 bulging in the opposite direction on the axis 33 and a linear portion extending in parallel with each other and connecting the semicircular portions.
35, 35.

As shown in FIG. 1 (b), the blade stopper 31 includes a completely circular flange portion 36, an engagement portion 37 having an oval cross section, and a blade contact portion 39 having a flat surface 38. The flange 36, the engaging portion 37, and the blade contact portion 39 are arranged on an axis. The shape and size of the engagement portion 37 of the blade stopper 31 substantially match the shape of the hole 32.

Then, as shown in FIG. 1 (c), the blade stopper 31 is inserted into the hole 32 of the cylinder 3 with the flange portion 36 outside, and the flange portion 36 is engaged with the peripheral edge of the hole 32. I have. Further, the blade stopper 31 projects the blade contact portion 39 into the cylinder 3 and has a flat surface.
The blade 38 is oriented perpendicular to the direction in which the blade 10 in the cylinder 3 extends, and the flat surface 38 faces the end surface 10a of the blade 10 substantially in parallel from the front.

Further, the blade stopper 31 has the engaging portion 37 positioned inside the hole 32, and is fitted into the hole 32 so that the outer peripheral surface of the engaging portion 37 contacts the inner peripheral surface of the hole 32 over the entire circumference. Let me. And
The blade stopper 31 is positioned in the radial direction of the cylinder 3 by the flange portion 36, and furthermore, the engagement portion
Positioning in the rotation direction is performed by 37.

That is, in the fluid compressor in which the blade stopper 31 is attached to the cylinder 3 as described above, the blade stopper 31 can be easily positioned in the rotation direction, and the blade stopper 31 is pressed by the blade 10 to be flat. It is possible to prevent the direction of the surface 38 from changing.

Further, since the blade stopper 31 can be easily positioned, processing and assembly of the fluid compressor is easy, and this fluid compressor is suitable for mass production.

2 (a) to 2 (c) show a main part of a second embodiment of the present invention.

Reference numeral 3 in FIG. 2 (a) is a cylindrical cylinder constituting a compression mechanism. This cylinder 3 has an annular concave portion 51 which is formed on the outer peripheral portion thereof and has substantially the same width in the circumferential direction. I have. In addition, a hole 53 for inserting a blade stopper into which a blade stopper 52 to be described later is inserted is formed on the bottom surface of the concave portion 51 in a shape of a perfect circle.

The blade stopper 52 has a rectangular flange 54
And an engaging portion 55 having a true circular cross-section and a blade contact portion 57 having a flat surface 56 are integrally formed. The flange portion 54, the engaging portion 55, and the blade contact portion 55 are formed integrally. The contact portions 57 are arranged on the axis.

Further, the blade stopper 52 has a width dimension of the flange section 54 set to a value slightly larger than a diameter dimension of the engagement section 55 and a value slightly smaller than a width dimension of the concave section 51 of the cylinder 3. Then, the blade stopper 52 is moved as shown in FIG.
As shown in the figure, the flange portion 54 is inserted into the hole 53 of the cylinder 3, and the flange portion 54 is inserted into the concave portion 51 with the width direction along the axis 33 of the cylinder 3.

Then, the blade stopper 52 makes the flange portion 54 a hole 53
Of the flange 54 and the side edge of the flange 54.
58, 58 approach and face the inner wall of the recess 51. The blade stopper 51 is positioned by the flange 54 in the radial direction of the cylinder 3 and in the rotational direction.

That is, in the fluid compressor in which the blade stopper 51 is attached to the cylinder 3 as described above, similarly to the first embodiment, the positioning of the blade stopper 51 in the rotation direction can be easily performed. It is possible to prevent the 51 from being pushed by the blade 10 and changing the direction of the flat surface 56.

[Effects of the Invention] As described above, the present invention has a spiral groove whose pitch is gradually reduced from one end to the other end on the outer peripheral portion, and a spiral blade is inserted into the groove so as to be able to enter and exit freely. The cylindrical rotating body is eccentrically arranged in the cylinder, and the rotating body and the cylinder are relatively rotated to compress the working fluid while gradually transferring the working fluid from the suction side to the discharge side of the cylinder. In a fluid compressor in which a blade stopper is provided which protrudes inward and abuts against the end of the blade to lock the blade, and this blade stopper is inserted into a blade stopper insertion hole formed in the cylinder and connected to the cylinder, The shape of the hole for inserting the blade stopper is set to a shape outside the true circle, and the cross-sectional shape of the blade stopper is prevented from rotating by engaging the blade stopper with the hole for inserting the blade stopper. Shape.

In addition, a concave portion is formed in a portion of the outer peripheral portion of the cylinder which is located around the hole for inserting the blade stopper, and a flange which is inserted into the concave portion and is locked to the cylinder to prevent rotation of the blade stopper. Part was provided.

Therefore, the present invention has an effect that the positioning of the blade stopper in the rotation direction can be easily performed, and the fluid compressor can be easily processed and assembled.

[Brief description of the drawings]

1 (a) to 1 (c) show a main part of a first embodiment of the present invention, and FIG. 1 (a) shows a blade stopper insertion hole provided in a cylinder. FIG. 1 (b) is a plan view showing the blade stopper, and FIG. 1 (c) is a plan view showing the state where the blade stopper is inserted into the blade stopper insertion hole. Figure (a)
FIG. 2 (c) shows a main part of a second embodiment of the present invention, and FIG. 2 (a) is a plan view showing a hole for inserting a blade stopper provided in a cylinder, and FIG. 2 (b) is a plan view showing the blade stopper, FIG. 2 (c) is a plan view showing the blade stopper inserted into the blade stopper insertion hole, and FIGS. 3-5. (D)
Fig. 3 shows a conventional example, Fig. 3 is a sectional view showing a main part of a fluid compressor, Figs. 4 (a) and 4 (b) are sectional views showing a blade stopper and a peripheral portion thereof, and Figs. 5 (a) is a plan view showing a blade stopper insertion hole provided in the cylinder, FIG. 5 (b) is a side view showing the blade stopper, and FIG. 5 (c) is also a blade stopper. FIG. 5 (d) is a plan view showing the state where the blade stopper is inserted into the hole for inserting the blade stopper. 3 ... cylinder, 4 ... piston (rotating body), 9 ... spiral groove, 10 ... blade, 31, 52 ... blade stopper, 32, 53 ... hole for blade stopper insertion.

Claims (2)

(57) [Claims] 1. A cylindrical rotating body having a spiral groove with a gradually reduced pitch from one end side to the other end side on its outer peripheral part and a spiral blade inserted into and out of the groove. Eccentrically arranged in the cylinder, the rotating body and the cylinder are relatively rotated to compress the working fluid while gradually transferring the working fluid from the suction side to the discharge side of the cylinder. A fluid compressor having a blade stopper that protrudes and abuts on an end of the blade to lock the blade, and that the blade stopper is inserted into a blade stopper insertion hole formed in the cylinder and connected to the cylinder; In the above, the shape of the hole for inserting the blade stopper is a shape outside the true circle, and the cross-sectional shape of the blade stopper is changed by the blade stopper when the blade stopper is inserted. Fluid compressor, characterized in that it has a shape which is prevented from rotating engage the hole. 2. A cylindrical rotating body having a spiral groove having a gradually reduced pitch from one end side to the other end side and having a spiral blade inserted into and out of the groove at the outer periphery thereof. Eccentrically arranged in the cylinder, the rotating body and the cylinder are relatively rotated to compress the working fluid while gradually transferring the working fluid from the suction side to the discharge side of the cylinder. A fluid compressor provided with a blade stopper that protrudes and abuts on an end of the blade to lock the blade, and that the blade stopper is inserted into a blade stopper insertion hole formed in the cylinder and connected to the cylinder; In the above, a concave portion is formed in a portion of the outer peripheral portion of the cylinder located around the blade stopper insertion hole, and the concave portion is inserted into the blade stopper and Fluid compressor, characterized in that a flange portion for preventing rotation engagement locks the blade stopper to the cylinder.