JPH07224776A - Fluid compressor - Google Patents

Abstract

PURPOSE:To provide a helical blade type fluid compressor which can prevent the leakage of compressed fluid at the position where a blade stopper is mounted with simple constitution. CONSTITUTION:This fluid compressor is equipped with a cylinder 10, a rotary piston, which is arranged eccentrically within this cylinder d10, and first and second blades 14 and 15 which demarcate the space between the inside periphery of the cylinder 10 set around this rotary piston 11 and the outside periphery of the rotary piston 11 into plural compression spaces 18 and 19. This is further equipped with mounting holes, which are mounted, piercing the sidewall of this cylinder 10, at the positions corresponding to both sides of the helical blades 14 and 15 of the cylinder, first and second blade stoppers 16 and 17, which are inserted in these mounting holes and regulate the shifting of the helical blades 14 and 15, with their heads projected into the cylinder 10, and O rings, which seal the boundaries between both, being interposed between these blade stoppers 16 and 17 and the mounting holes.

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 which is a working fluid in a refrigeration cycle, for example.

[0002]

2. Description of the Related Art Recently, for example, as a fluid compressor for compressing a refrigerant (working fluid) used in a refrigerating cycle, a helical blade which can improve the hermeticity by a relatively simple structure and can perform efficient compression. A compressor (hereinafter referred to as "compressor") has been proposed.

This fluid compressor has a cylindrical cylinder rotatably supported by a main bearing and a sub bearing, and a cylinder arranged in the cylinder, and the axis line is eccentric from the cylinder by the main bearing and the sub bearing. A cylindrical rotor piston that is rotatably supported around it, a spiral groove that is recessed on the outer peripheral surface of the rotor piston, and has a unequal pitch that gradually narrows toward one end in the axial direction. It is equipped with a spiral blade (helical blade) that is rewritably inserted.

In this compressor, by rotating the cylinder and the rotor piston relative to each other, the compression space defined by the cylinder, the rotor piston and each blade is moved to one end side in the axial direction of the rotor piston. The refrigerant is transferred while being gradually reduced in volume, and the refrigerant sucked into the compression space is compressed.

By the way, in general, the cylinder is provided with a blade stopper for restricting the movement of the helical blade provided on the rotor piston along the spiral groove.

The blade stoppers are provided at positions corresponding to both ends in the lengthwise direction of the helical blade of the cylinder so as to project inward from the inner peripheral surface of the cylinder.

The blade stopper limits the movement of the helical blade in the direction along the spiral groove by abutting the end of the helical blade on the inner side of the cylinder. Has become.

This blade stopper is generally installed by providing a mounting hole penetrating in a thickness direction of the peripheral wall of the cylinder at a predetermined portion, and by fitting the mounting hole into the mounting hole from the outside of the cylinder. The ones that are commonly used are.

[0009]

By the way, in the above-mentioned constitution, since the through hole is provided in a part of the cylinder, when the difference between the internal pressure of the cylinder and the external pressure is large. It is conceivable that the compressed gas escapes through the gap between the blade stopper and the through hole.

In particular, in the case of a helical blade compressor having a high-pressure type inside the hermetically sealed case, the above-mentioned phenomenon is likely to occur in the blade stopper provided on the refrigerant suction side. That is, on the refrigerant suction side, in the cylinder,
The low-pressure refrigerant before being compressed is exhausted. on the other hand,
The outside of the cylinder, that is, the inside of the case is often filled with the high-pressure refrigerant already compressed and discharged from the cylinder.

Therefore, on the refrigerant suction side of the cylinder, there is a large pressure difference between the inside and outside of the cylinder, which may cause compression loss. The present invention has been made in view of the above circumstances, and an object thereof is to provide a helical blade type fluid compressor capable of preventing leakage of compressed gas at a blade stopper mounting position with a simple structure. It is a thing.

[0012]

A first means of the present invention is to form a cylindrical cylinder, a rotating body eccentrically arranged in the cylinder, and an outer periphery of the rotating body at unequal pitches. A spiral groove, and a helical blade wound around the spiral groove and partitioning a space between the inner peripheral surface of the cylinder and the outer peripheral surface of the rotating body into a plurality of compression spaces,
By relatively rotating the cylinder and the rotating body,
In a fluid compressor that sequentially compresses the fluid to be compressed in the compression space while moving the fluid in the axial direction of the rotating body, the fluid compressor is disposed at a position corresponding to an end of the helical blade of a cylinder. A mounting hole penetrating the side wall of the cylinder, and a blade stopper which is inserted into the mounting hole and projects a tip portion thereof into the cylinder to restrict movement of the helical blade in the spiral direction, This blur
The elastic seal member is interposed between the stopper and the mounting hole and seals between the stopper and the mounting hole.

A second means is characterized in that, in the fluid compressor of the first means, a step for engaging with each other is provided on each mounting surface of the mounting hole and the blade stopper.

A third means is characterized in that, in the fluid compressor of the first means, a cross section of a mutual engaging portion of the mounting hole and the blade stopper is non-circular or polygonal. Is.

According to a fourth means, in the fluid compressor of the first means, the portion of the blade stopper attached to the cylinder exposed on the outer surface side of the cylinder is made to coincide with the outer surface of the cylinder, and at the same time, the cylinder of the cylinder is A cover member for pressing the blade stopper together with the outer surface of the cylinder is fitted on the outer surface.

A fifth means is characterized in that, in the fluid compressor according to the fourth means, the covering member also serves as a rotor of a drive motor provided on the outer surface of the cylinder. It is a thing.

A sixth means is a hermetic case, a cylindrical cylinder provided in the hermetic case, a rotor eccentrically arranged in the cylinder, and an outer periphery of the rotor. A spiral groove formed at an unequal pitch, and a helical blade wound around the spiral groove and partitioning a space between the inner peripheral surface of the cylinder and the outer peripheral surface of the rotating body into a plurality of compression spaces.
By rotating the cylinder and the rotating body relative to each other, the compressed fluid introduced into the compression space is moved in the axial direction of the rotating body while its volume is reduced and high pressure is applied. In the fluid compressor for discharging the fluid to be compressed outside the case after filling the compressed fluid in the case,
A mounting hole which is arranged at a position corresponding to the end of the helical blade and is formed through the side wall of the cylinder, and is inserted into the mounting hole so that the tip of the mounting blade projects into the cylinder. -A blade stopper that restricts the movement of the blade and a blade that is disposed at least on the refrigerant suction side.
The elastic seal member is interposed between the stopper and the mounting hole and seals between the stopper and the mounting hole.

[0018]

According to this structure, it is possible to effectively prevent the compressed gas from leaking from the mounting portion of the blade stopper, and it is possible to perform an efficient operation.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. This helical blade compressor (hereinafter referred to as "compressor") has a closed casing as shown in FIG.
1, a compressor unit 3 disposed in the central portion of the hermetically sealed case 2, and an electric motor unit 4 for driving the compressor unit 3 to perform a compression operation.

The closed case 2 is a cylindrical main body 2 having a bottom.
a and a lid body 2 for closing the left side of the main body 2a on the paper surface
b and a main bearing 6 that closes the right open side of the main body 2a. The main bearing 6 includes a flange portion 6a that closes the main body 2a, and a bearing portion 6b provided at the center of the flange portion.

On the other hand, a holding plate 7 is provided at the boundary between the lid 2b and the main body 2a so as to partition the main body 2a and the lid 2b. To 8
The sub bearing shown by is fixed in a state of facing the bearing portion 6b of the main bearing 6.

As shown in FIG. 1, the compressor section 3 has a cylindrical cylinder 10 whose both ends are open. The both end open sections of the cylinder 10 are the bearing sections 6 b of the main bearing 6. And the sub bearing 8 are airtightly and slidably inserted in the rotation direction. As a result, the cylinder 10 is rotatably held with the central axis A of rotation being horizontal.

In the hollow portion of the cylinder 10, a rotor piston 11 as a cylindrical rotating body is housed along the axial direction. The central axis B of this rotor piston 11
Are arranged eccentric to the center axis A of the cylinder 10 by a distance e, and a part of the outer peripheral surface of the rotor piston 11 is in contact with the inner peripheral surface of the cylinder 10 along the axial direction. .

A main shaft 11a and a sub shaft 11b are integrally provided at both ends of the rotor piston 11, and these are rotatably supported by a bearing portion 6b and a sub bearing 8 of the main bearing 6, respectively. There is.

Further, between the rotor piston 11 and the cylinder 10, a rotational force transmission mechanism 12 shown by 12 in the drawing is provided.
(Oldham mechanism) is provided. The torque transmission mechanism 12 is provided in the cylinder 1 by an electric motor unit 4 described later.
When 0 is rotationally driven, the rotational force is transmitted to the rotor piston 11, and the rotor piston 11 is rotated in the same phase as the cylinder 10.

On the other hand, on the outer peripheral surface of the rotor piston 11, elongated first and second helical blades shown by 14 and 15 in the drawing are respectively provided from the central portion of the rotor piston 11 to the spindle 11a. And, the spiral winding is performed such that the pitch becomes gradually narrower in the direction of the sub shaft 11b.

The first and second helical blades 14,
As shown in FIGS. 1 and 2, the reference numeral 15 is inserted into and attached to first and second spiral grooves (not shown) which are spirally recessed along the outer peripheral surface of the rotor piston 11, and It is provided so as to project from the inside of the spiral groove to the outside in the radial direction of the rotor piston 11.

The first and second spiral grooves are formed starting from the axially intermediate positions of the rotor piston 11 which are offset from each other by 180 ° in the circumferential direction.
The number of turns is substantially equal or the absolute value of the difference is substantially equal to an integer (n = 1, 2, 3, ...).

The helical blades 14 and 15 inserted into the first and second spiral grooves elastically abut the inner peripheral surface of the cylinder 10 as shown in FIG. , And the rotor piston 11, a plurality of compression spaces 18 ..., 19 ... are partitioned outward in the axial direction, respectively.

Since the first and second helical blades 14 and 15 are wound in a spiral shape with unequal pitch, the volumes of the compression chambers 18 and 19 are equal to each other at both ends of the rotor piston 11. It is getting smaller and smaller toward.

Further, the central portion and the right end portion of the cylinder 10 are brought into contact with both end portions of the first helical blade to move the first helical blade 14 in the direction along the spiral groove. First and second blade stoppers 16 and 17 for regulating are provided.

Further, first and second blade stoppers 16 and 17 for restricting the movement of the second helical blade 15 are provided at the central portion and the left end portion of the cylinder 10. Although the second blade stopper 17 of the second helical blade 15 is omitted in the drawing because of the drawing, the second blade stopper 17 of the first helical blade 14 is omitted. It is assumed to be provided at a position symmetrical with.

Next, the helical blade stoppers 16 and 17 and the mounting structure of the helical blade stoppers 16 and 17 will be described with reference to FIG. 1 in the figure
Reference numeral 6 is a first blade stopper. The first blade stopper 16 is formed in a plug shape and has a lower end portion 16a having a circular cross section and a flange portion 16 provided at the upper end portion.
b.

The flange portion 16b is provided with a step at a middle portion in the height direction, and the first and second step portions 2 having different outer diameters are provided.
1, 22 are provided. The outer diameter of the second step portion 22 is smaller than the outer diameter of the first step portion 21,
It is formed larger than the outer diameter of 6a.

An O-ring 23 made of fluororubber or natural rubber (NBR) having elasticity is provided on the second step portion 22. On the other hand, reference numeral 10 in the drawing denotes a side wall of the cylinder. The side wall is provided with a mounting hole 24 for the first blade stopper 16. The mounting hole 24 is provided with a step at a midway portion in the height direction.
First and second inner diameter portions 24a, 24b having an inner diameter substantially the same as the outer diameters of the first and second stepped portions of the blade stopper 16 of FIG.
Are formed. The depth of the first inner diameter portion 24a is formed to be larger than the thickness of the first step portion 21.

The cross-sectional diameter of the O-ring 23 is the difference between the radii of the first and second step portions 21 and 22, or
The thickness of the first step portion 21 and the first inner diameter portion 24a
Is formed to be slightly larger than the difference in depth, so that the gap between the blade stopper 16 and the mounting hole 24 can be elastically sealed.

To insert the first blade stopper 16 into the mounting hole 24, the second step portion 22 is inserted into the second inner diameter portion 24b, and the first inner diameter portion 24b is inserted. The second step portion 22 is press-fitted into the inside 24a together with the O-ring 23.

Therefore, the gap between the first blade stopper 16 and the mounting hole 24 is sealed by the O-ring 23. The second blade stopper 17 has the same shape as the first blade stopper 17, and the second blade stopper 17 has the same shape as the mounting hole 24 at the position where the second blade stopper 17 is inserted. A mounting hole 24 is provided so that the second blade stopper 17 can be mounted while being sealed by the O-ring 23.

When the first and second blade stoppers 16 and 17 are mounted on the cylinder 10 in this manner, the thin pressing collar shown by 26 in FIG. -Is fitted.

As a result, the first and second blade stoppers 16 and 17 are completely fixed to the cylinder 10. It should be noted that stopper holes 25a, 25b into / out of which the first and second blade stoppers 16, 17 are inserted and removed as the cylinder 10 rotates are provided at both ends of the spiral groove provided in the rotor piston 11. Is recessed.

On the other hand, a suction pipe 27 communicating with the main shaft 11a is provided at the center of the main bearing 6. Further, one end of the rotor piston 11 is the main shaft 11
A communication hole 28 is provided which is open to the end surface of a and communicates with the suction pipe 27, and the other end of which is open to the outer peripheral surface of the rotor piston 11 at an axially intermediate portion.

From the communication hole 28, the auxiliary shaft 1
A pressure introducing hole 29 communicating with the end face of 1b is provided. The main bearing 6 and the sub bearing 8 are provided with discharge holes 30 and 31 for discharging the fluid compressed in the cylinder 10 into the case 2. The compressed fluid discharged from the discharge hole 30 provided in the main bearing 6 is
After the case body 2a is once filled, the case body 2a is allowed to flow through a through hole 7a provided in the partition plate 7 into the space defined by the lid 2b.

The compressed fluid discharged from the discharge hole 31 of the sub bearing 8 is directly discharged into the space defined by the lid 2b. The lid 2b is provided with a discharge pipe 33 for discharging the compressed fluid filled in the space defined by the lid 2b to the outside of the case 2.

On the other hand, the electric motor section 4 includes the cylinder 1
A rotor 34 fitted to the outer peripheral surface of the color 26, which is externally inserted to 0, and an inner peripheral surface of the case main body 2a, are fixed to the rotor 34 with a small gap. And a cylindrical stator 35.

Therefore, this compressor rotates the cylinder 10 about the central axis A through the rotor 34 by operating the electric motor section 4. The rotation of the cylinder 10 is transmitted to the rotor piston 11 by the rotational force transmission mechanism 12 (Oldham ring), and the rotor piston 11 rotates about the central axis B.

As a result, the refrigerant sucked from the suction pipe 27 into the compression spaces 18 and 19 moves toward both ends of the rotor piston 11 while gradually decreasing its volume, and is sequentially compressed. .

The compressed refrigerant once fills the case body 2a and the lid 2b from the discharges 30 and 31, and then is discharged to the outside of the case 2 through the discharge pipe 33. It

During operation, the movement of the first and second helical blades 14 and 15 in the spiral direction is as follows.
Restricted by the second blade stoppers 16 and 17, it is possible to effectively prevent the rotational balance of the rotor piston 11 from being lost.

According to this structure, the following effects can be obtained. First, a step for engaging with each other between the blade stoppers 16 and 17 and the mounting hole 24 provided in the cylinder 10 is provided, and an O-ring is interposed in the joint, and the step is fitted in the cylinder. The color stopper prevents the blade stopper from coming off.

As a result, there is an effect that it is possible to prevent compression loss of the high-pressure type compressor in which the case 2 is filled with the high-pressure discharge fluid, and to perform efficient operation.
Secondly, the O-rings 23 provided on the blade stoppers 16 and 17 function as a cushioning material, and the blade stopper 1
It is possible to effectively prevent the vibrations of 6 and 17 and the vibration of the cylinder 10 caused thereby.

As a result, the noise of the compressor can be prevented, and the deviation of the first and second helical blades 14 and 15 can be prevented to keep the rotor piston 11 in good balance. effective.

Thirdly, a collar 26 as a covering member is provided on the outer peripheral surface, and the blade stoppers 16 and 1 are provided.
Since 7 is pressed, it is not necessary to fix the stoppers to the cylinder one by one, and the blade stoppers 16 and 17 can be easily attached.

Therefore, the cylinder 10 has a simple structure.
There is an effect that it is possible to obtain a compressor that can prevent the compressed gas from escaping. It should be noted that the present invention is not limited to the above-mentioned one embodiment, and can be variously modified without changing the gist of the invention.

For example, the first and second blade stoppers 16 and 17 are not limited to the shape shown in the above-mentioned embodiment, but may have the shape shown in FIG. 3 or FIG. 4, for example. May be. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the blade stopper 16 'shown in FIG. 3, an oval (non-circular) top plate portion 36 is further provided on the first step portion. The top plate portion 36 is integrally formed with other portions and constitutes a blade stopper 16 'as a whole.

Also, in the mounting hole 24 ', at the upper end,
A third inner diameter portion 24c corresponding to the top plate portion 36 is provided. With such a blade stopper 16 ', the sealing performance is increased by the top plate portion 36, and the sealing property is further improved. Further, since the blade stopper 16 'can be prevented from rotating, the blade stopper 16' can be effectively prevented from coming off.

The blade stopper is not limited to a circular cross section but may be a polygonal shape. For example, as shown in FIG. 4, the blade stopper has a square cross section. Is also good.

Further, in the above-described embodiment, the cover member for fixing the first and second blade stoppers 16 and 17 is the collar 26, but the present invention is not limited to this and is not limited to this. As shown in FIG. 5, the rotor 3 of the electric motor unit 4 is
4 may also be used. In this case, the rotor 34 serves as the cover member of the present invention.

As shown in FIG. 6, the cylinder 1
First blade stopper 16 provided at the center of 0
Is pressed by the rotor 34 of the electric motor section, and the second blade stoppers 17 provided at both ends of the cylinder 10 are held.
May be held by a bracket 37 extending from the outer surface of the rotor 34 to the outer surface of the cylinder 10.

At this time, the cover member is the rotor 3
4 and the bracket 37, and the rotor 34 is formed by the bracket 37.
It is fixed to the outer peripheral surface of the cylinder 10.

Further, in the above-mentioned one embodiment, the compressor portion 3 and the electric motor portion 4 are provided in the closed case 2. However, the present invention is not limited to this, and is relatively limited. In the case of a compressor having a large compression capacity, the hermetic case 2 may be omitted and the compressor section 3 and the electric motor section 4 may be exposed to the outside.

Also in this case, it is possible to effectively prevent the compression leakage from the cylinder 10 due to the pressure difference from the atmospheric pressure. In the above embodiment, the O-ring 23 and the covering member (color 26) are provided on both the first and second blade stoppers 16 and 17, but the second one is provided on the discharge side. In some cases, the blade stopper 17 need not be provided with the O-ring 23 or the covering member.

That is, in the case of a hermetic compressor having the hermetic case 2, the pressure of the fluid to be compressed in the discharge side of the cylinder 10 is such that the hermetic case 2 is compressed. It is almost equal to the fluid pressure.

Therefore, in this case, there is little concern about compression leakage even without providing a seal member such as the O-ring 23. Further, in this case, a through hole along the axis may be provided at the center of the second blade stopper 17 to be used as a discharge hole for discharging the compressed fluid into the case 2.

Further, the compressor shown in the above-mentioned one embodiment is of the twin type having two helical blades 14 and 15, but the invention is not limited to this, and one helical blade is provided. The same effect can be obtained even if there is only a single type.

[0066]

As described above, in the present invention, the blade stopper and the mounting hole are sealed, and the blade stopper is fixed by the cover member. With such a structure, it is possible to prevent compression leakage at the blade stopper mounting position with a simple structure and to perform efficient operation.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a fluid compressor showing a first embodiment of the present invention.

FIG. 2 is a front view with a partial cross section showing an enlarged view of the blade stopper and the mounting structure of the blade stopper.

FIG. 3 is a front view showing a blade stopper of another embodiment.

FIG. 4 is a front view showing a blade stopper of another embodiment.

FIG. 5 is an overall vertical sectional view showing a fluid compressor of another embodiment.

FIG. 6 is an overall vertical sectional view showing a fluid compressor according to another embodiment of the present invention.

[Explanation of symbols]

2 ... Case, 10 ... Cylinder, 11 ... Rotor piston (rotating body), 14 ... 1st blade, 15 ... 2nd blade, 16 ... 1st blade stopper, 17 ... 2 blade stopper, 23 ... O-ring, 21 ... 1st step part, 22 ... 2nd step part, 24 ... Mounting hole, 24a ... 1st
Inner diameter portion, 24b ... Second inner diameter portion, 26 ... Color (cover member).

Claims (6)

[Claims] 1. A cylindrical cylinder, a rotating body eccentrically arranged in the cylinder, spiral grooves formed on the outer circumference of the rotating body at unequal pitches, and wound around the spiral groove. A helical blade that divides a space between the inner peripheral surface of the cylinder and the outer peripheral surface of the rotating body into a plurality of compression spaces, and the compression is performed by relatively rotating the cylinder and the rotating body. In a fluid compressor that sequentially compresses the fluid to be compressed in the space while moving it in the axial direction of the rotating body, the fluid compressor is disposed at a position corresponding to the end of the helical blade of a cylinder. A mounting hole penetrating the side wall of the cylinder, a blade stopper which is inserted into the mounting hole and has a tip portion protruding into the cylinder to restrict the movement of the helical blade, and the blade stopper. Up It is interposed between the mounting holes,
A fluid compressor comprising: an elastic seal member that seals between the two. 2. The fluid compressor according to claim 1, wherein the mounting surfaces of the mounting hole and blade stopper are attached to each other.
A fluid compressor characterized in that it is provided with steps that engage with each other. 3. The fluid compressor according to claim 1, wherein the cross-sections of the engaging portions of the mounting hole and the blade stopper are non-circular or polygonal. 4. The fluid compressor according to claim 1, wherein a portion of the blade stopper attached to the cylinder, which is exposed to the outer surface side of the cylinder, is made to coincide with the outer surface of the cylinder, and the outer surface of the cylinder is provided with the cylinder. And a cover member for pressing the blade stopper together with the outer surface of the fluid compressor. 5. The fluid compressor according to claim 3, wherein the cover member also serves as a rotor for a drive motor provided on the outer surface of the cylinder. 6. A hermetically sealed case, a cylindrical cylinder provided in the hermetically sealed case, a rotating body eccentrically arranged in the cylinder, and an unequal pitch on the outer circumference of the rotating body. And a helical blade wound around the spiral groove and partitioning a space between the inner peripheral surface of the cylinder and the outer peripheral surface of the rotating body into a plurality of compression spaces. By rotating the cylinder and the rotating body relatively,
The compressed fluid introduced into the compression space is moved in the axial direction of the rotating body to reduce its volume, and the high pressure compressed fluid is filled in the case and then discharged to the outside of the case. In the fluid compressor, a mounting hole is provided at a position of the cylinder corresponding to the end of the helical blade, and a mounting hole is formed through the side wall of the cylinder. Is inserted between the blade stopper that restricts the movement of the helical blade and the blade stopper that is disposed at least on the refrigerant suction side and the mounting hole. A fluid compressor, comprising: