JP3290223B2 - Fluid compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid compressor for compressing a refrigerant in a refrigeration cycle, for example.

[0002]

2. Description of the Related Art For example, the present applicant has filed a Japanese Patent Application No.
A fluid compressor (hereinafter, referred to as a compressor) as described in the specification of 91754 has been proposed.

[0003] In this case, a cylinder and a piston constituting a compression mechanism are eccentrically arranged in a sealed case, and a spiral groove is formed in the piston to gradually decrease the pitch from one end to the other end. It is formed. A spiral blade is also fitted into this groove so that it can freely enter and exit.

The space between the piston and the cylinder is divided into a plurality of sections by the blade, and the volume of the cylinder is gradually increased from one end to the other end, that is, from the suction section to the discharge section. Is formed in the working chamber.

[0005] The cylinder is provided with a rotor, and an annular stay having a small gap with the outer peripheral surface of the rotor.
The motor is fixed to the inner wall of the sealed case, and these constitute a motor.

[0006] By energizing the motor, the rotor and the cylinder rotate integrally. The rotational force of the cylinder is transmitted to the piston via the rotational force transmitting mechanism, and the cylinder and the piston rotate relatively and synchronously while maintaining the positional relationship.

[0007] With these rotations, the blade enters and exits the groove, and protrudes and retracts in the radial direction of the piston. Further, the refrigerant in the refrigeration cycle is sucked into the cylinder, and is transferred from the suction chamber located closest to the suction section side of each working chamber to the discharge chamber located closest to the discharge section side, and during the transfer. It is compressed gradually.

In such a compressor, two blade stoppers are provided at a suction portion and a discharge portion of a cylinder. Each blade stopper is inserted into a cylinder and protrudes into the cylinder. Each blade stopper abuts against each end of the blade which is to move along the groove when the refrigerant is compressed, and prevents this movement.

A discharge hole is formed in the discharge-side blade stopper, and communicates between the discharge chamber and a sealed case outside the cylinder. Refrigerant in the discharge chamber passes through the discharge holes and is sealed.
The air is discharged into the compressor, once filled therein, and returned to the outside of the compressor through a discharge pipe connected to a sealed case.

[0010]

By the way, in a compressor having such a blade stopper, a hermetic casing is required.
When the high-pressure refrigerant is once discharged into the cylinder, gas leakage occurs around the suction-side blade stopper due to the pressure difference between the outside and the inside of the cylinder, and the performance of the compressor is reduced. . Further, the thickness of the cylinder is set as thin as possible, and the blade stopper is engaged with the cylinder. Therefore, in the above compressor, a cylinder band processed in an annular shape is fitted around the cylinder.

[0011] Note that the cylinder band is a brake
The outer peripheral surface of the cylinder is tightly pressed over the outer peripheral surface of the cylinder. The cylinder band presses the flange of the blade stopper from the outside, and the end of the blade stopper is maintained in a state of protruding into the cylinder.

As described above, both the suction-side blade stopper and the discharge-side blade stopper are pressed by separate cylinder bands to prevent the cylinder blade from coming off the cylinder. Because of its small thickness, there is a limit to the firm pressing by the cylinder band.

Therefore, the reliability of pressing of each blade stopper is low. In addition, since each blade stopper is externally fitted with a different cylinder band, labor is required and the number of parts is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to prevent the cylinder from being adversely affected, securely fix the blade stopper, prevent the occurrence of gas leakage, and improve reliability. It is to provide a fluid compressor with high performance.

[0015]

In order to achieve the above object, a first aspect of the present invention is to provide:

A spiral groove formed at a gradually decreasing pitch is provided on the outer peripheral portion of the rotating body, and the rotating body is eccentrically arranged in the cylinder, and a spiral blade is fitted in the groove so as to be able to enter and exit. And a plurality of working chambers which are partitioned by the blades and gradually reduce in volume are formed in the cylinder, and the cylinder is provided with a rotor and a rotor comprising a stator and a rotor.
A fluid compressor in which a cylinder and a rotating body are relatively rotated by the motor, and the fluid to be compressed sucked into the cylinder is gradually transferred from the suction side to the discharge side to be compressed. At

The cylinder is provided with a suction-side blade stopper and a discharge-side blade stopper which contact the suction-side end and the discharge-side end of the blade, respectively, and regulate the movement of the blade.

A cylindrical cylinder cover for restricting each blade stopper from projecting from the cylinder is fitted on the outer peripheral surface of the cylinder and at the cylinder mounting portion of the suction side blade stopper and the discharge side blade stopper. It is a fluid compressor. A second aspect of the present invention is the fluid compressor according to claim 1, wherein the cylinder cover is formed integrally with or combined with a rotor of the motor. A third invention uses a permanent magnet as a rotor constituting the motor,

The cylinder cover includes the permanent magnet and
And a permanent magnet for the cylinder.
While holding the suction side blade stopper and discharge side
2. The fluid compressor according to claim 1 , wherein the protrusion of the fluid stopper from the cylinder is regulated . By doing so, the present invention can securely fix the two blade stoppers and prevent the occurrence of gas leak from around the blade stoppers.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.

The compression mechanism 3 and the motor 4 are housed in the closed case 2. In the compression mechanism 3, a piston 6 as a rotating body is eccentrically arranged in the cylinder 5, and the cylinder 5 and the piston 6 are supported by a main bearing 7 fixed to the inner wall of the closed case 2. I have.

Each end of the cylinder 5 in the axial direction is closed by the main bearing 7 and the sub-bearing 8, and the main shaft 9 and the sub-shaft 10 formed at each end of the piston 6 in the axial direction. It is inserted into each bearing 7,8.

A spiral groove 11 having a gradually decreasing pitch is formed in the piston 6 from one end to the other end, and a spiral blade 12 is fitted into the groove 11. It is rare. (All are indicated by dashed lines in the figure.)

Further, the space between the piston 6 and the cylinder 5 is divided into a plurality of parts by the blade 12, and the inside of the cylinder 5 is moved from one end to the other end of the cylinder 5, that is, the suction port. Working chambers 13 are formed from the section to the discharge section to gradually reduce the volume.

The motor 4 comprises an annular stator 14 fixed to the inner wall of the closed casing 2 and a similarly annular rotor 15 arranged inside the stator 14. It is configured.

The rotor 15 is externally mounted on the cylinder 5, and when the motor 4 is energized, the rotor 15 and the cylinder 5 rotate integrally. The rotational force of the cylinder 5 is transmitted to the piston 6 via the rotational force transmitting mechanism 16, and the cylinder 5 and the piston 6 rotate relatively and synchronously while maintaining the positional relationship.

With the relative rotation of the cylinder 5 and the piston 6, the blade 12 moves in and out of the groove 11,
The piston 6 protrudes and retracts in the radial direction. Furthermore, the sealing case 2
For example, a refrigerant in a refrigeration cycle is sucked into the cylinder 5 through a suction pipe 17 connected to the cylinder 5 and a suction passage 18 formed in the main bearing 7.

Then, the refrigerant sucked into the cylinder 5 is sequentially transferred from the suction chamber 19 located closest to the suction section among the working chambers 13 to the discharge chamber 20 located closest to the discharge section. . Further, the refrigerant is gradually compressed while being transferred from the suction chamber 19 to the discharge chamber 20.

The cylinder 5 has two suction-side and discharge-side cylinders.
Two blade stoppers 21 and 22 are provided. Each of the blade stoppers 21 and 22 is inserted into a portion located at the same rotation angle of the cylinder 5 and protrudes into the cylinder 5. As shown in FIG. 2, elongated holes 23 and 24 in the axial direction are opened in the cylinder 5, and ends of the blade stoppers 21 and 22 having a perfect circular shape are fitted into the holes.

As shown in FIG. 1 again, the blade stoppers 21 and 22 are disposed on the suction side and the discharge side of the cylinder 5, respectively, and the suction side end and the discharge side end of the blade 12 are provided. Located in the vicinity of the part.

The suction-side blade stopper 21 is formed in a solid columnar shape having a step on the outer periphery, and the discharge-side blade stopper 22 is formed in a solid columnar shape also having a step on the outer periphery. .

Each of the blade stoppers 21 and 22 is inserted into the cylinder 5 from the outside to the inside, and its axis is directed in the radial direction of the cylinder 5. The blade stoppers 21 and 22 are engaged with the cylinder 5 using steps on the outer periphery.

The suction side blade stopper 21 is
Of the suction part side, that is, on the right side in the figure,
It protrudes into the suction chamber 19. And the motor 4
The piston 15 is located outside in the axial direction and enters the suction-side recess 6 a of the piston 6. The flange portion is exposed to the outside of the cylinder 5 and is covered by a cylinder cover 25 that fits over the cylinder 5.

The discharge-side blade stopper 22 is disposed on the discharge portion side of the cylinder 5, that is, on the left side in the drawing, and protrudes into the discharge chamber 20. In addition, Blade 1
2 is located in the vicinity of the discharge side end, and enters the discharge side recess 6 b of the piston 6.

The flange 15 is located outside the cylinder 5 in the axial direction of the rotor 15 and is covered with the same cylinder cover 25 having the suction side blade stopper 21 fitted to the outside. Have been done.

Each of the blade stoppers 21 and 22 is provided with a blade.
When the blade 12 attempts to move toward the suction part or the discharge part along the groove 11, it comes into contact with the end of the blade 12,
Prevent this movement.

That is, although the suction and discharge side blade stoppers 21 and 22 are located outside the rotor 15, they are covered by the cylinder cover 25 fitted to the cylinder 5, so that they are pushed by the blade 12. Even if it is done, it will not come off from the cylinder 5 and will be securely fixed to the cylinder 5. In particular, the sealability between the suction chamber 19 and the outside of the cylinder 5 can be improved, and the suction-side blade stopper 2
1 to prevent the generation of gas leak around.

The auxiliary bearing 8 is formed with a discharge hole 26 as a working fluid passage that extends while being bent in the circumferential direction from the axial direction. The compressed refrigerant gas discharged into the discharge chamber 20 is sealed once. The discharge is guided into the case 2. Sealed case 2
Is connected to a discharge pipe 27, and guides the compressed refrigerant gas discharged from the discharge chamber 20 into the closed case 2 to the outside of the compressor.

The suction and discharge side blade stoppers 21 and 22 are desirably applied with an adhesive to achieve a more complete seal when pressure difference is applied between the inside and the outside of the cylinder 5. The result is obtained.

In such a compressor of the so-called high pressure type inside the case, in which the high pressure gas compressed in the closed case 2 is filled, the suction side blade stopper 21 is fixed with an adhesive. Further, this adhesive has a function of completely preventing the cylinder cover 25 and the cylinder 5 from coming off. FIG. 3 shows a second embodiment of the present invention, which is, for example, a fluid compressor (hereinafter, referred to as a compressor) used in a refrigeration cycle.

In this compressor, two helical blades 12, 12 are wound around a piston 6A as a rotating body. These blades 12 and 12 have a piston 6
A, and is fitted into the spiral grooves 11, 11 having a pitch gradually changing from the intermediate portion to the end portion.

Further, the blades 12, 12 have their outer peripheral surfaces in contact with the inner peripheral surface of the cylinder 5A, and partition the space between the cylinder 5A and the piston 6A into a plurality. In the cylinder 5A, the working chamber 13A whose volume gradually decreases from the axially intermediate portion to each end.
, 13B ... are formed.

A suction gas introduction passage 18A is formed in the piston 6A. This suction gas introduction passage 18A
Consists of a portion that extends along the axis of the piston 6A and opens at both end surfaces, and a portion that communicates with the intermediate portion in the axial direction, extends along the radial direction, and opens to the peripheral surface.

The suction gas introduction passage 18A is located at an intermediate portion in the axial direction of the cylinder 5A. Here, the working chambers 13A and 13B, which are suction chambers, and the main bearing 7 and the sub bearing 8 are provided.
With the inner cavities 7a and 8a. However, only the inner bore 8a of the sub bearing 8 is closed and sealed by the closing plate 30.

In such a compressor, the peripheral surface of the suction gas introduction passage 18A is covered with a heat insulating material 31. Therefore, the gas guided from the suction tube 17 to the suction gas introduction passage 18A through the lumen 7a of the main bearing 7 is not overheated by the discharge gas or the heat generated by the motor 4 while passing through the passage, and the compression capacity is reduced. Can be prevented from decreasing.

Although not shown here, the cylinder 5A
Are provided with two sets of two blade stoppers on the suction part side and the discharge part side. Each blade stopper is covered by a cylinder cover (not shown) which is fitted to the cylinder, and is the same as in the above-described embodiment. Effect.

In the balance type compressor as shown in FIG. 4, the peripheral surface of the suction hole 18 provided in the main bearing portion 7A communicating with the suction tube 17 is covered with a heat insulating material 33.
Since such a heat insulating material 33 is provided, the suction tube 17 is provided.
It is possible to prevent overheating of the gas sucked from the air and led to the suction hole 18 as in the previous embodiment.

Although not shown here, the cylinder 5 is provided with two blade stoppers on the suction portion side and the discharge portion side, and each blade stopper is fitted on the cylinder, not shown. It is covered by the cylinder cover and has the same effect as the above-described embodiment. As shown in FIG. 5, a DC motor may be employed as the motor 4A.

In this case, a rotor magnet 15a, which is a permanent magnet, is externally fitted to the cylinder 5. The rotor magnet 15a has a length in the axial direction inside of the mounting portion of the suction-side blade stopper 21 and the discharge-side blade stopper 22.

The rotor magnet 15a is a cylinder
It is held on the cylinder 5 by the cover 50 . This poem
A non-magnetic material is used as a material of the cover 50 . As shown in detail in FIG. 6, the cylinder cover 50
Is composed of two cover dividers 51 and 52.

The first cover splitter 51 has a magnet fitting portion 51a having a diameter and an axial length in which the rotor magnet 15a can be fitted, and a cylinder fitting portion 51b fitted on the outer periphery of the cylinder 5. Are connected to each other.

The second cover splitter 52 has a bent portion 52a in contact with the end face of the rotor magnet 15a and a cylinder fitting portion 52b fitted on the outer periphery of the cylinder 5 in series.

As shown in FIG. 5 again, the first cover splitter 51 has the cylinder fitting portion 51b with the rotor magnet fitting portion 51a fitted with the rotor magnet 15a.
Are externally fitted to the peripheral surface of the cylinder 5. This cylinder fitting portion 5
1b also covers the suction-side blade stopper 21 to prevent the removal, and also covers a part of the Oldham receiving locking pin 53 constituting the rotational force transmission mechanism 16A to prevent the removal. That is, since the discharge hole 54 is provided in the pin 53, it is necessary that the hole 54 is not completely closed.

The second cover divider 52 has a bent portion 52a.
Abuts on the end face of the rotor magnet 15a to cover the rotor magnet 15a together with the first cover divider 51.
The cylinder fitting portion 52b is fitted to the outer peripheral surface of the cylinder 5 and covers the discharge-side blade stopper 22 to prevent the cylinder from coming off.

In the case of an AC motor, the cylinder cover 25 shown in FIG. 1 may be replaced with the rotor itself. That is, the cylinder cover 25 may be formed integrally with the rotor 15 of the motor 4, or there is no problem even if the cylinder cover 25 has a dual-purpose structure. The same parts as those in the above embodiment are denoted by the same reference numerals and a new description is omitted, and the operation is the same as that of the same embodiment, so that the new description is omitted.

The use of the fluid compressor of the present invention is not limited to a refrigeration cycle. The present invention can be variously modified without departing from the gist.

[0057]

As described above, according to the present invention, the cylinder is provided with the suction-side blade stopper and the discharge-side blade stopper which respectively contact the suction-side end and the discharge-side end of the blade. In addition, since a cylindrical cylinder cover for restricting each blade stopper from projecting from the cylinder is fitted to the cylinder mounting portion of each blade stopper, the blade stopper is securely fixed, and gas leakage around the blade stopper is achieved. This has the effect of preventing the occurrence of cracks and improving the reliability of the fluid compressor.

When a permanent magnet is used as a rotor constituting the motor, the permanent magnet is held by the cylinder cover with respect to the cylinder, and the suction-side blade stopper and the discharge-side blade stopper are securely fixed. Thus, it is possible to prevent the occurrence of gas leak around the blade stopper and to improve the reliability of the fluid compressor.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a fluid compressor according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the embodiment.

FIG. 3 is a schematic cross-sectional view of a fluid compressor, showing a modification.

FIG. 4 is a cross-sectional view of a different modification, in which a fluid compressor is partially omitted.

FIG. 5 is a cross-sectional view of a further modified example, in which a fluid compressor is partially omitted.

FIG. 6 is a vertical cross-sectional view of the embodiment, in which main parts are exploded.

[Explanation of symbols]

11 ... groove, 6 ... rotating body (piston), 5 ... cylinder, 1
2 ... blade, 13 ... working chamber, 14 ... stator, 15 ...
Rotor, 4 ... motor, 21 ... suction side blade stopper,
22 ... discharge side blade stopper, 25 ... cylinder cover, 15a ... permanent magnet (rotor magnet), 50 ... sheet
Linda cover .

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Okuda 70 Yanagimachi, Yuki-ku, Kawasaki City, Kanagawa Prefecture Inside the Toshiba Yanagimachi Plant (72) Inventor Takuya Hirayama 8 Shinsugita-machi, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Corporation Yokohama business house (72) inventor Kawashima Kyo嗣Kawasaki-shi, Kanagawa-ku, Saiwai Komukaitoshiba-cho, address 1 Corporate research and development in the Center (58) investigated the field (Int.Cl. ^7, DB name) F04C 18/344 311 F04C 18/107

Claims (3)

(57) [Claims] A helical groove formed at a gradually decreasing pitch is provided on an outer peripheral portion of a rotating body, and the rotating body is eccentrically arranged in a cylinder, and a helical blade is fitted in the groove so as to be able to enter and leave. Into the cylinder, partitioned by the blade,
Forming a plurality of working chambers that gradually reduce the volume, the above-mentioned rotor of a motor consisting of a stator and a rotor is externally mounted on a cylinder, and the cylinder and the rotating body are relatively rotated by the motor, and the inside of the cylinder is formed. In the fluid compressor, which compresses the sucked compressed fluid while gradually transferring the compressed fluid from the suction side to the discharge side, the cylinder is brought into contact with the suction side end and the discharge side end of the blade, respectively. A cylinder that is provided with a suction-side blade stopper and a discharge-side blade stopper that regulates movement, and that controls the protrusion of each blade stopper from the cylinder on the outer peripheral surface of the cylinder and at the cylinder mounting portion of the suction-side blade stopper and the discharge-side blade stopper. A fluid compressor characterized by fitting a cylindrical cover. 2. The fluid compressor according to claim 1, wherein the cylinder cover is formed integrally with or serves as the rotor of the motor. 3. The rotor constituting the motor is a permanent magnet, and the cylinder cover is attached to the permanent magnet and the cylinder.
When the external magnet is held against the cylinder
Both the suction-side blade stopper and the discharge-side blade
2. The fluid compressor according to claim 1, wherein the protrusion of the hopper from the cylinder is restricted .