JP2003003978A - Fluid compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a helical type fluid compressor holding sure seal performance with no special seal member required to make the atmosphere of low pressure on the inside of a case with high performance, high reliability, at a low cost. SOLUTION: This fluid compressor is provided with a press means 19 pressing a roller 11 of a helical compression mechanism part 4 to the delivery side in this helical compression mechanism part 4 on the inside of a case 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical type fluid compressor for continuously compressing a fluid to be compressed in an axial direction of a cylinder, and more particularly to a fluid compressor having a reliable end face on a roller discharge side.

[0002]

2. Description of the Related Art A refrigeration cycle is incorporated in an air conditioner for indoor cooling and heating, a refrigerator, a freezing showcase, etc.
The refrigeration cycle is equipped with a compressor that compresses the refrigerant. Rotary type compressors other than reciprocating type compressors are widely used as this type of compressor, and helical compressors that employ helical blades in the compression mechanism are also being adopted.

Since such a helical compressor is characterized in that the amount of the enclosed refrigerant can be reduced and the overheating of the compressor can be reduced, a type of helical compressor having a low pressure atmosphere inside the case has been proposed.

In recent years, especially from the viewpoint of global environment, natural refrigerant (HC
(For example, a system refrigerant) is accelerating, and in that case, it becomes indispensable to create a low-pressure atmosphere inside the case (because it is flammable, the amount of enclosed refrigerant must be reduced). In this type of helical compressor, it is necessary to seal the working gas after compression and the low-pressure gas in the case, and as a technique for responding to this, JP-A-11-
Japanese Patent No. 257263 describes a helical compressor provided with at least a seal ring for separating the pressure in the case and the pressure in the compression chamber.

However, a problem with the helical compressor described in the publication is that a separate seal member is required, the structure is complicated, and the cost is increased. Further, since the differential pressure before and after compression is applied to the seal member, the reliability of the seal member may be deteriorated in some cases.

[0006]

SUMMARY OF THE INVENTION Therefore, it is possible to maintain a reliable sealing property without using a separate sealing member, and to achieve high performance, high reliability and low cost. A fluid compressor has been desired.

The present invention has been made in consideration of the above-mentioned circumstances, and it is possible to maintain a reliable sealing property without the need for a separate sealing member, and to provide a high performance, high reliability and low cost inside the case. An object is to provide a helical type fluid compressor having a low pressure atmosphere.

[0008]

In order to achieve the above object, the invention of claim 1 of the present application is such that a hermetically sealed case, a cylinder arranged in the hermetically sealed case, and an eccentric arrangement in the cylinder. Helical compression provided with a roller and a spiral blade between the roller and the cylinder, which defines a plurality of compression chambers whose volume gradually decreases from the suction side to the discharge side along the cylinder axial direction. A fluid compressor having a mechanism section and a rotation drive means for eccentrically rotating the roller in the cylinder, and having a low-pressure atmosphere inside the case, wherein the helical compression mechanism section pushes the roller toward the discharge side. The gist of the present invention is a fluid compressor characterized in that a pressing means for attaching is provided.

According to the second aspect of the present invention, in the pressing means, the pressing portion provided on the roller of the helical compression mechanism portion has a pressure between the compression chamber side pressure and the case internal pressure generated by the compression of the helical compression mechanism portion. The gist of the fluid compressor according to claim 1 is that it is pressed by a difference.

According to a third aspect of the present invention, the pressing portion is a flange portion which is provided at an end of the roller on the discharge side and is larger than a cylinder inner diameter cross-sectional area. The main point is.

In the invention of claim 4 of the present application, the area of the region of the pressure in the case acting on the end surface of the roller on the discharge side is larger than the cylinder inner diameter cross-sectional area. The main point is.

According to a fifth aspect of the present invention, the pressing means is characterized in that a pressing portion provided on the roller is pressed by an elastic body provided between the cylinder of the helical compression mechanism section and the roller. The gist is that it is the fluid compressor according to claim 1.

According to a sixth aspect of the present invention, the pressing portion is at least one of a flange portion provided at a discharge side end portion of the roller, a suction side end surface of the roller, and a crank portion of the roller. The gist is that it is the fluid compressor according to claim 5.

In the invention of claim 7 of the present application, the gist is that the fluid compressor according to claim 5 or 6 is characterized in that a thrust receiver is provided on at least one of the one surface and the other surface of the elastic body. There is.

In the invention of claim 8, the elastic body is provided between the bearing of the compression mechanism portion and the suction side end surface of the roller, and the elastic body forms a seal portion between the bearing and the suction side end surface, and the suction is performed. It is a gist of the fluid compressor according to any one of claims 5 to 7, wherein the side roller inner cavity portion and the suction chamber are separated.

In the invention of claim 9 of the present application, an oil reservoir for retaining lubricating oil is formed by the suction side bearing of the compression mechanism section and the suction side roller inner cavity provided in the roller, and this oil reservoir section is formed. An elastic body is provided, the elastic body separates the oil reservoir from the suction chamber, and the lubricating oil of the oil reservoir is periodically supplied to the suction chamber as the roller rotates. A gist of the fluid compressor according to any one of claims 5 to 8 is that a space is provided.

According to the tenth aspect of the present invention, the discharge side bearing of the compression mechanism section and the discharge side roller inner cavity portion provided in the roller form an oil reservoir in which lubricating oil is retained, and the Oldham is provided in this oil reservoir. A gist of the fluid compressor according to any one of claims 1 to 9 is that a mechanism is provided.

In the invention of claim 11 of the present application, the pressing means presses a pressing portion provided on the roller by a pressure difference and an elastic body, according to any one of claims 1 to 10. The gist is that it is the described fluid compressor.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a fluid machine according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a fluid machine according to the present invention, for example,
It is a longitudinal section showing one embodiment of a horizontal helical compressor.

As shown in FIG. 1, a fluid compressor, for example,
The horizontal helical compressor 1 includes a hermetically sealed case 2, an electric motor unit 3 arranged on one side of the hermetically sealed case 2, and a hermetically sealed case 2
It has a compression mechanism section 4 which is arranged on the other inner side and is driven by the electric motor section 3.

The helical compressor 1 is constructed so that low-pressure gas is sucked into the closed case 2 through the suction pipe 5, compressed by the compression mechanism portion 4, and discharged through the discharge pipe 6 to the outside of the closed case 2. It is a so-called low pressure type in a case.

The electric motor section 3 constitutes a rotation driving means,
A motor stator 7 fixed to the inner surface of the closed case 2,
The motor rotor 8 rotates in the motor stator 7. A crankshaft 9 having a crank portion 9a on one side extends from the motor rotor 8 toward the compression mechanism portion 4 side.

On the other hand, the compression mechanism section 4 includes a cylinder 10 and
A roller (rotating body) 11 mounted on the crankshaft 9 and eccentrically arranged in the cylinder 10, and the roller 11
Between the cylinder 10 and a plurality of compression chambers 12 whose volume gradually decreases from the suction side to the discharge side, there are provided spiral blades 13 that partition and form along the axial direction of the cylinder 10. The blade 13 is housed in a blade groove 14 formed on the outer surface of the cylinder 10. The blade groove 14 has a substantially rectangular cross-section, for example, while its groove pitch is gradually reduced in the axial direction of the roller 11. Is formed.

Both ends of the cylinder 10 have main bearings 15
And the secondary bearing 16 are closed, and the primary bearing 15 and the secondary bearing 16 are tightened by a tightening bolt (not shown) in the cylinder 10.
Is screwed to.

The blade 13 is housed in a blade groove 14 formed on the outer peripheral surface of the roller 11. The blade 13 is constrained by the inner peripheral wall of the cylinder 10 by the eccentric rotational movement of the roller 11, and smoothly slides in and out of the blade groove 14. . Roller 11
A rotation preventing mechanism 17 is provided so as to revolve the roller 11 and prevent the roller 11 from rotating when eccentrically rotating. The rotation prevention mechanism 17 is, for example, an Oldham mechanism, and
Is installed between the end surface of the sub bearing and the sub bearing 16.

The crankshaft 9 on which the motor rotor 8 and the roller 11 are mounted is rotatably supported by a main bearing 15 and an auxiliary bearing 16. The crankshaft 9 has a crank between the bearings 15 and 16. Part 9
a is formed, and the roller 11 is axially mounted on the crank portion 4a. The rotary shaft 9 is composed of a main bearing portion 9b supported by the main bearing 15, a crank portion 9a, and a sub bearing portion 9c supported by a sub bearing 16.

Further, the compressor section 4 is provided with a pressing means for applying a force for pressing the roller 11 to the discharge side (sub bearing 16 side). This pressing means sucks the flange portion 18 provided on the discharge side end portion of the roller 11, the suction side end surface 11a of the roller 18, and the crank portion 11a of the roller 11 all or at least at one point with the discharge side (high pressure side). It is pressed by the pressure difference on the side (low pressure side).

In the present embodiment, as shown in FIG. 2, the pressing portion is the flange portion 18 provided at the discharge side end of the roller 11. The flange portion 18 is formed to have a cross-sectional area larger than the inner diameter cross-sectional area of the cylinder 10, that is, the flange portion diameter D1 is formed to be larger than the cylinder inner diameter Dc, and further, a member for receiving the thrust of the roller,
For example, the thrust surface 16a of the sub bearing 16 is brought into contact with the thrust surface 16a and the flange portion 18
An airtight seal portion 19 that separates the discharge side (high-pressure compression chamber side pressure) Pd from the suction side (low-pressure case internal pressure) Ps by
Are formed. A recess 16b is formed in the thrust surface 16a of the auxiliary bearing 16, and the recess 1
The area of 6b is formed larger than the inner diameter cross-sectional area of the cylinder 10, that is, the recess diameter D2 is formed larger than the cylinder inner diameter Dc.

The recess 16b helps reduce the friction between the roller 11 and the thrust surface 16a, and the low pressure Ps state is established.

Further, an oil supply groove 20 for oil supply is provided on the surface of the crankshaft 9, and the oil supply groove 20 is provided.
One communicates with the lubricating oil 22 stored in the bottom of the closed case through an oil supply passage 21 provided in the sub bearing 16, and the other extends to the sub bearing 16 and the main bearing 15.
The rotation of the crankshaft 9 pumps up the lubricating oil 22 through the oil supply passage 21 to supply the auxiliary bearing 16 and the main bearing 15.

Next, the operation of the horizontal helical compressor of the first embodiment will be described.

By energizing the electric motor section 3 of the horizontal helical compressor 1 as shown in FIG. 1, the electric motor section 3 is activated to generate a rotating magnetic field in the motor stator 7, and the motor rotor 8 is rotationally driven.

The rotational force of the motor rotor 8 is transmitted to the crank portion 9a via the crankshaft 9 which is an output shaft, and causes the roller 11 to eccentrically rotate (revolve). By the eccentric rotation of the roller 11, the roller 11 slides while inscribed on the inner peripheral surface of the cylinder 10 and revolves around the sun. Due to the eccentric rotation of the roller 11, each compression chamber 12 formed by the blade 13 between the cylinder 10 and the roller 11 moves in a helical shape in the cylinder axis direction and changes in volume so that the volume gradually decreases. In each compression chamber 12, the refrigerant that has been sucked through the suction pipe 5 and the gas suction hole 10s due to a change in volume is sequentially compressed to have a high pressure, and the high pressure side compression chamber 12 on the auxiliary bearing 16 side passes through the discharge hole and the discharge pipe 6. Is ejected.

In the process of compressing the refrigerant as described above, as shown in FIG. 2, the compression mechanism portion 4 is provided with the pressing means, for example, the flange portion 18 on the discharge side of the roller 11, so that the high pressure side. The high-pressure Pd refrigerant gas discharged from the compression chamber presses the flange portion 18 against the auxiliary bearing 16. At this time, since the concave portion 16b has a low pressure Ps as in the closed case 2, the following force F acts on the flange portion 18. F = π / 4 (Dc ² −D2 ² ) (Pd−Ps) works, and the force F due to this pressure difference always works on the flange portion 18 regardless of the pressure of the seal portion 19 and the discharge side (high pressure side). The suction side (low pressure side) is reliably sealed and the compression efficiency is improved.

Further, by providing the seal portion 19,
Even if a separate sealing member is not provided, the high pressure side and the low pressure side are reliably sealed by the seal portion 19, and the compression efficiency is improved.

Next, a first modified example of the first embodiment of the fluid machine according to the present invention will be described.

In the first modified example, the pressing means of the first embodiment uses the pressure difference with the flange portion, whereas the elastic member presses the roller.

For example, as shown in FIG. 3, the fluid machine 1A of the first modified example uses an elastic body 25A such as a coil spring, a leaf spring, or a corrugated washer as a pressing means.
5A is the main bearing 15A and the suction side end surface 11A of the roller 11A.
It is arranged between the _first and second rollers to press the roller 11A toward the ejection side. Since other configurations are not different from those of the horizontal helical compressor shown in FIG. 1, the same reference numerals are given and the description thereof is omitted and the same applies hereinafter.

Since the elastic body 25A is provided as described above, the high pressure side and the low pressure side are reliably sealed by the seal portion, and sufficient pressing force can be obtained even when the pressure difference is not sufficiently obtained at the time of starting. Can be obtained.

The roller may be pressed against the discharge side by a structure using only an elastic body. However, in addition to the elastic body shown in FIG. 3, a flange portion similar to the flange portion shown in FIG. 1 is provided. By pressing the roller toward the ejection side by the elastic body, the flange portion and the pressure difference, the sealing effect is surely improved by the synergistic effect.

A second modified example of the first embodiment of the fluid machine according to the present invention will be described.

In the second modified example, the elastic member is directly provided between the main bearing and the suction side end surface of the roller in the first modified example, whereas the thrust receiving member is provided on at least one of the one surface and the other surface of the elastic body. Is provided.

For example, as shown in FIG. 4, in the fluid machine 1B of the first modified example, thrust receivers 26B are provided on both surfaces of the elastic body 25B. The seal portion 27B is formed between the thrust receiver 26B, the roller 11B, and the main bearing 15B. It is not always necessary to provide the seal portion 27B on both sides, but it may be provided on only one side. By providing the thrust receiver 26B, the elastic body 25B and the roller 11B or the main bearing 15
It is possible to prevent fixed components such as B from sliding directly, and improve the reliability of the fluid compressor 1B.

Furthermore, a third modification of the first embodiment of the fluid machine according to the present invention will be described.

In the third modification, the elastic member is provided directly between the main bearing and the suction side end surface of the roller in the first modification, whereas the elastic body is provided between the main bearing and the crank portion of the roller. It is a thing.

For example, as shown in FIG. 5, in the fluid machine 1C of the third modification, the elastic body 25C has an end surface of the bearing portion 15C ₁ of the main bearing 15C and the crank portion 11C _{1 of the} roller 11C.
A thrust receiver 26C is provided between them. Therefore, the sealing effect is improved. Further, the length of the compression mechanism can be shortened as compared with the first modification in which the elastic body is provided between the main bearing and the suction side end surface of the roller, and a compact fluid compressor can be obtained.

A fourth modification of the first embodiment of the fluid machine according to the present invention will be described.

The fourth modification is different from the third modification in that the elastic body is provided between the main bearing and the crank portion of the roller.
The elastic body is provided between the discharge side end surface of the cylinder and the flange portion.

[0050] For example, as shown in FIG. 6, the fluid machine 1D of the fourth modified example is provided with the elastic member 25D between the discharge-side end surface 10D ₁ and the flange portion 18D of the cylinder 10D. Therefore, the sealing effect is improved.

Further, in the fifth modified example, while the concave portion is formed in the thrust surface of the auxiliary bearing with which the flange portion of the first embodiment abuts, the concave portion is not formed and the entire flange portion is formed. And contacts the side surface of the auxiliary bearing.

For example, as shown in FIG. 7, in the fluid machine of the fifth modified example, the thrust surface 15E ₁ of the sub bearing 15E is flat, and the flange portion 18E covers the entire surface of the sub bearing 15E.
It contacts the side surface 15E ₁ of E. Since the entire surface is sealed, the sealing effect is further improved.

A second embodiment of the fluid machine according to the present invention will be described.

In the second embodiment, the oil reservoir for retaining the lubricating oil is not provided in the space formed between the main bearing and the roller in the first embodiment, whereas the oil reservoir is provided. It is a thing.

[0055] For example, as shown in FIG. 8, the roller 11F of the compression mechanism portion 4F of the lateral helical compressor 1F and suction side roller lumen 11F ₁ is provided, the main bearing 15F
The bearing portion 15F ₁ for receiving the crankshaft 9 extends to the inside of the suction side roller inner cavity portion 11F ₁ . The suction side roller inner cavity portion 11F ₁ and the bearing portion 15F ₁ form an oil reservoir portion 11F _{2 in} which lubricating oil is retained.

[0056] Also, between the main bearing suction-side end surface of the side 15F2 and roller 11F of 15F 11F _3, is provided an elastic member 25F, it presses the roller 11F to the discharge side, also, the oil reservoir 11F ₂ and the compression chamber It separates from the suction chamber 12F ₁ located on the most suction side of 12F. Thereby, the elastic body 25H and the end surface 15F ₂ , and the elastic body 25H and the suction side end surface 11
The oil reservoir internal seal portions 15f ₁ and 15f ₂ are formed between F ₃ .

By providing the elastic body 25F in this way, the sealing force between the roller 11F and the sub bearing 16F is ensured by the pressing force of the elastic body 25F, and the elastic body 25F
The lubricating oil staying in the oil reservoir 11F ₂ due to F is sucked into the suction chamber 12
It is possible to effectively prevent the oil from flowing into F ₁ and reduce the amount of oil discharged.

A first modification of the second embodiment of the fluid machine according to the present invention will be described.

In the first modification, the elastic member is provided between the side surface of the main bearing and the suction side end surface of the roller in the second embodiment, whereas the lubricating oil is periodically applied to the suction side end surface of the roller. A space for oil supply to be supplied to the compression chamber is provided.

For example, as shown in FIG. 9, the roller 11G
In the suction-side end surface 11G ₁ , the oil supply space 11G ₃ that periodically supplies the lubricating oil of the oil reservoir 11G ₂ to the compression chamber 12G.
Is provided.

The refueling space portion 11G ₃ is a recess as shown in FIG. 10, for example, a circular hole. Therefore, the lubricating oil from the oil reservoir 11G ₂ entering the oil supply space 11G ₃ is
With the rotation of the roller 11G, an appropriate amount can be periodically supplied and the sealing property is improved.

The recess of the refueling space may be a slit groove 11G ₄ as shown in FIG.

Further, a second modification of the second embodiment of the fluid machine according to the present invention will be described.

In the second modification, the oil supply space of the first modification is a recess provided on the suction side end face, whereas it is a recess formed in an elastic body.

For example, as shown in FIG. 12, a fluid compressor
Side surface 15H of main bearing 15H provided at 1H₁And Laura
11H suction side end face 11H₁Elastic body 25H is provided between
This elastic body 25H is shown enlarged in FIG.
U-shaped cross section and refueling space 11H_ThreeTo form
Metal spring 25H₁And this metal spring 25H ₁
U-shaped synthetic resin body 2 provided so as to surround the three surfaces of
5H_TwoIt is composed of. Therefore, the oil reservoir 11H_TwoFrom
Refueling space 11H_ThreeThe lubricating oil entering the roller 11H
With rotation, an appropriate amount can be supplied periodically.
Both synthetic resin bodies 25H_TwoAs a result, the sealing property is also improved.

A third embodiment of the fluid machine according to the present invention will be described.

In the third embodiment, in contrast to the second embodiment, the suction side roller inner cavity portion and the bearing portion of the main bearing form an oil reservoir for retaining lubricating oil, whereas the discharge side roller inner cavity portion is formed. Part and sub-bearing form an oil reservoir where lubricating oil stays,
Moreover, the Oldham mechanism is provided in the oil reservoir.

For example, as shown in FIG. 14, the roller 11J of the horizontal helical compressor 1J has a discharge side roller lumen portion 1
1J ₂ is provided, and the bearing portion 16J ₁ that receives the crankshaft 9J of the auxiliary bearing 16J extends to the inside of the discharge side roller inner cavity portion 11J ₂ . The discharge side roller inner cavity portion 11J ₂ , the bearing portion 16J ₁ and the thrust surface 16J ₂ form an oil reservoir portion 11J _{3 in} which lubricating oil stays. Oil reservoir 11J ₃ communicates with a lubricating oil 22J reserved in the bottom portion of the sealed case 2J through the oil supply passage 21J described in FIG 1, further Oldham mechanism 17J is provided.

Therefore, the lubricating oil 2 at the bottom of the closed case 2J
2J is oil reservoir 11J _3, is supplied through the oil supply groove 20J to each sliding portion of the compression mechanism 4J lubricating, cooling, also, it is possible to always refueling in Oldham mechanism 17 J.

The fluid compressor according to the present invention has been described by taking the horizontal helical compressor as an example in each of the above embodiments and modifications, but it may be a vertical fluid compressor.

[0071]

EFFECTS OF THE INVENTION According to the fluid compressor of the present invention, it is possible to maintain a reliable sealing property without the need for a separate sealing member, and to achieve high performance, high reliability and low cost. It is possible to provide the helical type fluid compressor.

That is, since the helical compression mechanism is provided with the pressing means for pressing the roller toward the discharge side, the high pressure side and the low pressure side are reliably sealed without the need for separately providing a sealing member, and the compression efficiency is improved.

Since the pressing means presses the pressing portion provided on the roller of the helical compression mechanism by the pressure difference between the pressure in the compression chamber and the pressure inside the case, which is generated by the compression of the helical compression mechanism, The roller can be surely pressed to the ejection side with a simple structure without providing a member.

Further, since the pressing portion is a flange portion which is provided at the discharge side end portion of the roller and is larger than the cylinder inner diameter cross-sectional area, the structure is simple and the pressure difference can be reliably received.

Further, since the area of the area of the in-case pressure acting on the discharge side end surface of the roller is larger than the cylinder inner diameter cross-sectional area, the pressure difference can be reliably received.

Further, since the pressing means presses the pressing portion provided on the roller by the elastic body provided between the cylinder of the helical compression mechanism section and the roller, the roller is surely pressed to the discharge side. You can In addition, a sufficient pressing force can be obtained even when a sufficient pressure difference cannot be obtained at the time of starting.

Further, since the pressing portion is at least one of the flange portion provided on the discharge side end portion of the roller, the suction side end surface of the roller, and the crank portion of the roller, the roller should be surely pressed against the discharge side. You can

Further, since the thrust receiver is provided on at least one of the one surface and the other surface of the elastic body, it is possible to prevent the elastic body and the fixed parts such as the roller or the main bearing from sliding directly, and the thrust of the fluid compressor can be prevented. The reliability can be improved.

Further, an elastic body is provided between the bearing of the compression mechanism section and the suction side end surface of the roller, and a seal section is formed between the bearing and the suction side end surface by the elastic body, and the suction side roller inner cavity section and the suction side are sucked. Since the chamber is separated, the pressure between the roller and the discharge side bearing is ensured by the pressing force of the elastic body.
The elastic body can effectively prevent the lubricating oil staying in the oil reservoir from flowing into the suction portion, and the amount of oil discharged can be reduced.

Further, the suction side bearing of the compression mechanism section and the suction side roller inner cavity provided in the roller form an oil reservoir in which lubricating oil is retained, and an elastic body is provided in this oil reservoir. , The elastic body separates the oil reservoir from the suction chamber,
With the rotation of the roller, an oil supply space for periodically supplying the oil in the oil reservoir to the suction chamber is provided, so that an appropriate amount can be supplied periodically and the sealing performance is improved. To do.

Further, the discharge side bearing of the compression mechanism portion and the discharge side roller inner cavity portion provided in the roller form an oil reservoir portion in which the lubricating oil stays, and the Oldham mechanism is provided in this oil reservoir portion. Lubricated by being supplied to each sliding part of the compression mechanism
It can be cooled and the Oldham mechanism can be constantly refueled.

Further, since the pressing means presses the pressing portion provided on the roller by the pressure difference and the elastic body, the roller is surely pressed to the discharge side by the synergistic effect of the pressure difference and the pressing force of the elastic body. To be

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of a fluid machine according to the present invention.

FIG. 2 is a sectional view of a seal portion used in the first embodiment of the fluid machine according to the present invention.

FIG. 3 is a first part of the first embodiment of the fluid machine according to the present invention.
The longitudinal cross-sectional view of a modification.

FIG. 4 is a second part of the first embodiment of the fluid machine according to the present invention.
The longitudinal cross-sectional view of a modification.

FIG. 5 is a third part of the first embodiment of the fluid machine according to the present invention.
The longitudinal cross-sectional view of a modification.

FIG. 6 is a fourth embodiment of the first embodiment of the fluid machine according to the present invention.
The longitudinal cross-sectional view of a modification.

FIG. 7 is a fourth embodiment of the first embodiment of the fluid machine according to the present invention.
The longitudinal cross-sectional view of a modification.

FIG. 8 is a longitudinal sectional view of a second embodiment of the fluid machine according to the present invention.

FIG. 9 is a first part of a second embodiment of the fluid machine according to the present invention.
The longitudinal cross-sectional view of a modification.

FIG. 10 is a plan view showing a refueling space portion provided in a second embodiment of the fluid machine according to the present invention.

FIG. 11 is a plan view showing a modified example of the oil supply space portion provided in the second embodiment of the fluid machine according to the present invention.

FIG. 12 is a cross-sectional view showing a modified example of the oil supply space portion provided in the second embodiment of the fluid machine according to the present invention.

FIG. 13 is an enlarged view of a refueling space provided in the second embodiment of the fluid machine according to the present invention.

FIG. 14 is a vertical sectional view of a fluid machine according to a third embodiment of the present invention.

[Explanation of symbols]

1 Horizontal helical compressor 2 sealed case 3 Electric motor section 4 compression mechanism 5 suction pipe 6 discharge pipe 7 Stator 8 rotor 9 crankshaft 9a Crank part 9c Main bearing part 9d Sub bearing 10 cylinders 10d discharge hole 10s suction hole 11 Roller (rotating body) 12 compression chamber 13 blades 14 blade groove 15 Main bearing 16 Secondary bearing 17 Rotation prevention mechanism 18 Flange 19 Seal part 20 lubrication groove 21 Oil supply passage 22 Lubricating oil

Claims (11)

[Claims] 1. A hermetically sealed case, a cylinder arranged in the hermetically sealed case, a roller eccentrically arranged in the cylinder, and a gradual gap between the roller and the cylinder from a suction side toward a discharge side. A helical compression mechanism section having a spiral blade that defines a plurality of compression chambers that reduce the volume thereof along the cylinder axis direction; and a rotation drive unit that eccentrically rotates the roller in the cylinder. A fluid compressor having a low-pressure atmosphere inside the case, wherein the helical compression mechanism portion is provided with pressing means for pressing the roller toward the discharge side. 2. The pressing means presses a pressing portion provided on a roller of the helical compression mechanism section by a pressure difference between a pressure on the compression chamber side and a pressure in the case, which is generated by the compression of the helical compression mechanism section. Claim 1 characterized by the above-mentioned.
The fluid compressor according to. 3. The fluid compressor according to claim 2, wherein the pressing portion is a flange portion which is provided at an end portion on the discharge side of the roller and is larger than a cylinder inner diameter sectional area. 4. The fluid compressor according to claim 2, wherein an area of a case internal pressure region acting on the discharge side end surface of the roller is larger than a cylinder inner diameter cross-sectional area. 5. The fluid according to claim 1, wherein the pressing means presses a pressing portion provided on the roller with an elastic body provided between the cylinder of the helical compression mechanism and the roller. Compressor. 6. The pressing portion is at least one of a flange portion provided on a discharge side end portion of a roller, a suction side end surface of the roller, and a crank portion of the roller. The described fluid compressor. 7. The fluid compressor according to claim 5, wherein a thrust receiver is provided on at least one of the one surface and the other surface of the elastic body. 8. The elastic body is provided between a bearing of a compression mechanism section and a suction side end surface of a roller, and a seal section is formed by the elastic body between the bearing and the suction side end surface, and a suction side roller inner cavity section is provided. The fluid compressor according to any one of claims 5 to 7, wherein the fluid compressor is separated from the suction chamber. 9. An oil reservoir for retaining lubricating oil is formed by a suction side bearing of the compression mechanism section and a suction side roller inner cavity provided in the roller, and an elastic body is provided in the oil reservoir. And this elastic body separates the oil reservoir from the suction chamber,
9. An oil supply space portion for periodically supplying lubricating oil of the oil reservoir to the suction chamber with the rotation of the roller is provided, according to any one of claims 5 to 8. The described fluid compressor. 10. An oil reservoir for retaining lubricating oil is formed by a discharge side bearing of the compression mechanism section and a discharge side roller bore provided in the roller, and an Oldham mechanism is provided in the oil reservoir. The fluid compressor according to any one of claims 1 to 9, characterized in that. 11. The fluid compressor according to claim 1, wherein the pressing means presses a pressing portion provided on the roller with a pressure difference and an elastic body.