JP2001082363A - Fluid compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid compressor to reduce a cost through reduction of the number of component parts and be reduced in weight. SOLUTION: This device comprises a helical blade type compression mechanism part 3; an electric motor part 4 consisting of a rotor 20, coupled to the compression mechanism part through a rotary shaft 2, and a stator 21; and a closed case 1 to contain the compression mechanism and the electric motor part. This closed case is formed such that a cylinder case part 10A consisting of the cylinder of the compression mechanism part and a stator case part 10B to effect secure fitting-in of the stator of the electric motor part are integrally formed together. The cylinder case part and the stator case part are formed in the same diameter as each other and a rotary shaft is pivotally supported on one bearing tool 6 mounted on the cylinder case part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid compressor having, for example, a helical blade type compression mechanism.

[0002]

2. Description of the Related Art A fluid compressor called a helical blade type compressor has been proposed for a refrigeration cycle. This is because a cylinder constituting a compression mechanism is arranged in a sealed case, and rollers are eccentrically arranged in this cylinder,
Revolve or rotate. A spiral groove is provided on the peripheral surface of the roller or the inner surface of the cylinder, and a blade is fitted therein so as to freely enter and exit.

A plurality of compression chambers are formed between the cylinder, rollers and blades, and refrigerant gas is sucked into one end of the compression chamber and compressed while being gradually transferred to the other end. .

[0004]

The compression mechanism is connected to the electric motor via a rotary shaft, and a main bearing is interposed between the compression mechanism and the electric motor. The main bearing is fixed to a sealed case, and supports a substantially intermediate portion of the rotating shaft. A sub-bearing is fixed to the one-side closed case of the compression mechanism, and supports the end of the rotating shaft.

[0005] With such a configuration, the compressor becomes longer in the axial direction. The height of the compressor is increased if the compressor is of a vertical type, and the required arrangement space is increased if the compressor is of a horizontal type. This leads to an increase in the size of the unit accommodating the compressor.

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and an object of the present invention is to make a sealed case accommodating a compression mechanism section and an electric motor section also a cylinder of the compression mechanism section. Another object of the present invention is to provide a fluid compressor which can reduce costs by reducing the number of components and reduce the weight.

[0007]

According to the present invention, there is provided a cylinder, a roller eccentrically disposed in the cylinder, and a spiral provided on an outer peripheral surface of the roller. -Shaped groove, a compression mechanism section having a blade which is freely fitted into and out of the spiral groove and forms a plurality of compression chambers between the cylinder and the roller, and is connected to the compression mechanism section via a rotating shaft. In a fluid compressor comprising a motor part comprising a rotor to be rotated, a stator arranged with a narrow gap on the peripheral surface of the rotor, and a sealed case accommodating the compression mechanism part and the motor part, In the case, a cylinder case forming a cylinder of the compression mechanism and a stator case for fitting and fixing a stator of the electric motor are integrated. Parts are formed in the same diameter to one another, characterized in that the rotary shaft is rotatably supported by the one bearing member which is attached to the cylinder case portion.

In order to achieve the above object, the present invention provides, in a second aspect, a fluid compressor including a compression mechanism, an electric motor, and a sealed case, wherein the sealed case forms a cylinder of the compression mechanism. The cylinder case portion and a stator case portion for fitting and fixing the stator of the electric motor portion are integrated, and the diameter of the cylinder case portion is formed smaller than the diameter of the stator case portion, and the boundary between the cylinder case portion and the stator case portion is formed. The stepped portion provided on the roller is opposed to the stepped portion.

According to a third aspect of the present invention, there is provided a fluid compressor including a compression mechanism, an electric motor, and a sealed case, wherein the sealed case forms a cylinder of the compression mechanism. The cylinder case is divided into a stator case for fitting and fixing the stator of the electric motor, and the diameter of the cylinder case is smaller than the diameter of the stator case. And the rotating shaft is supported by one bearing attached to the frame.

[0010] Claim 4 is Claim 1 to Claim 3.
The position of one end of the roller is regulated by an end plate, and the end plate is provided with a blade stopper that regulates a circumferential displacement of the blade.

According to a fifth aspect of the present invention, in the fluid compressor according to the third aspect, a notch is provided at an end of the cylinder case, and a blade stopper is provided in the notch to restrict a circumferential displacement of the blade. It is characterized by being able to.

By adopting the means for solving the above problems, the number of components is reduced, the cost can be reduced, and the weight can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The fluid compressor shown in FIG. 1 is a so-called helical blade compressor of a horizontal type.
A discharge refrigerant pipe Pa is connected to one end face of the closed case 1, and a suction refrigerant pipe Pb is connected to an upper surface in the vicinity of the discharge refrigerant pipe Pa. From the discharge refrigerant pipe Pa to the suction refrigerant pipe Pb, a condenser, an expansion valve forming a decompression mechanism, and an evaporator (all not shown) are sequentially communicated, and these constitute, for example, a refrigeration cycle of an air conditioner. .

The sealed case 1 comprises a bottomed cylindrical case body 1a to be deep drawn and a lid plate 1b for closing the open end of the case body. Helical blade type compression mechanism 3 and electric motor 4
Is accommodated.

To begin with, the compression mechanism 3 will be described.
Is provided, and the inside of the sealed case 1 is divided into right and left. A mounting hole 5 a is provided in a shaft core of the frame 5, and a bearing 6 is inserted through the mounting hole 5 a, and the frame 5 is mounted and fixed via a mounting screw 7.

The bearing 6 has a flange 6a substantially at the center in the axial direction, and guides 6b,
6b are integrally provided. One guide portion 6 b is inserted into the mounting hole 5 a of the frame 5, and the surface of the flange portion 6 a is in close contact with the surface of the frame 5 by the mounting screw 7.

A shaft support hole 6c is provided along the axis of the bearing 6, and the rotary shaft 2 is supported. One end of the rotating shaft 2 protrudes from the bearing 6, and the protruding end forms a crank portion 2 a eccentric to the axis of the rotating shaft 2.

An end plate 8 is provided substantially at an intermediate portion between the end surface of the eccentric crank portion 2a and the bottom surface of the closed case 1, and divides the inside of the closed case 1 into two right and left parts. In addition, sealed case 1
An oil reservoir (not shown) for accumulating lubricating oil is formed at the inner bottom of the end plate 8, and a discharge port 8 a is provided at a position above the lubricating oil surface of the end plate 8.

The flange 6a of the bearing 6 extends from the shaft support hole 6
An oil supply passage 9 composed of a suction pipe, an oil hole and an oil groove is formed between c and the peripheral surface of the rotary shaft 2 to suck the lubricating oil in the oil sump and slide each of the compression mechanisms 3. The part can be refueled.

A portion of the closed case 1 extending from the frame 5 to the end plate 8 also serves as a cylinder, and this closed case portion is hereinafter referred to as a cylinder case portion 10A. The roller 11 is eccentrically and rotatably accommodated in the cylinder case 10A. End plate 8 slightly from the axial center of roller 11
A pivot support step 11a is provided at a position shifted to the inner side so as to protrude toward the inner diameter side, and is slidably fitted into the rotary shaft eccentric crank 2a.

The amount of eccentricity of the roller 11 with respect to the center axis of the rotating shaft 2 is the same as the amount of eccentricity of the eccentric crank portion 2a, so that the outer diameter of the roller 11 comes into rolling contact with the inner diameter of the cylinder case portion 10A along the axial direction. Dimensions are set.

Therefore, when the eccentric crank portion 2a rotates eccentrically with the rotation of the rotary shaft 2, the roller 11 rotates eccentrically, and the rolling contact portion between a part of the outer peripheral surface of the roller 11 and the inner peripheral surface of the cylinder case portion 10A is formed. It moves sequentially in the circumferential direction.

The frame 5 side surface portion and the roller 11 end surface portion which are in close contact with each other are grooved with each other, and an Oldham ring mechanism 12 is interposed therebetween. The roller 11 is movable with respect to the fixed frame 5 and is eccentrically moved by the eccentric crank portion 2a. Therefore, the rotation of the roller 11 is controlled by the action of the Oldham ring mechanism 12, and the roller 11 is controlled to make a revolving motion.

A spiral groove 13 having a gradually decreasing pitch is provided on the peripheral surface of the roller 11 from the frame 5 side to the end plate 8 side. Blade 14 is fitted. The blade 14
The outer peripheral surface is formed so as to be in close contact with the inner peripheral surface of the cylinder case portion 10A over the entire length.

The cylinder case 10A and the roller 11
When the section is taken along the radial direction, the cylinder case 1
The roller 11 is accommodated eccentrically with respect to 0A, and a part of the outer circumferential surface of the roller is in rolling contact with the inner circumferential surface of the cylinder case. Is formed.

Looking at this space along the axial direction, the blade 14, the roller 11, and the cylinder case 10A are partitioned into a plurality of spaces, and these spaces are divided into the compression chamber 15 and the compression chamber 15. Call. From the setting of the spiral groove 13, the volume of each compression chamber 15 gradually decreases from the end on the frame 5 side to the end plate 8 side.

The suction refrigerant pipe Pb is connected to the cylinder case portion 10A, and its open end faces the compression chamber 15 at the end on the frame 5 side. From the position of the suction refrigerant pipe Pb and the setting of the pitch of the spiral groove 13, the compression chamber 15 on the frame 5 side becomes the suction section S, and the compression chamber 15 on the end plate 8 side becomes the discharge section D.

A discharge port 8a provided on the end plate 8
Communicates the compression chamber 15 on the discharge section D side with the space on the bottom surface side of the closed case 1 and further communicates with the discharge refrigerant pipe Pa connected here.

The electric motor section 4 is composed of a rotor 20 fitted to the rotating shaft 2 and a stator 21 which is located at a predetermined gap from the peripheral surface of the rotor and is fitted and fixed to the inner periphery of the closed case 1. Be composed. One portion of the sealed case, in which the stator 21 is fitted, corresponding to the cylinder case portion 10A is referred to as a stator case portion 10B.

That is, the sealed case 1 is
The cylinder case portion 10A also serving as the cylinder and the stator case portion 10B for fitting and fixing the stator 21 of the electric motor portion 4 are integrated.

Further, since the case body 1a constituting the closed case 1 is formed to have the same diameter along the axial direction,
The cylinder case portion 10A and the stator case portion 10B have the same diameter.

This is a helical blade type fluid compressor constructed as described above, and energizes the electric motor unit 4 to integrally rotate the rotary shaft 2 together with the rotor 20. Rotary axis 2
Is transmitted to the roller 11 via the eccentric crank 2a.

When the roller 11 tries to move with the rotation of the rotating shaft 2, the Oldham ring mechanism 12 acts to regulate the rotation of the roller. Roller 11 revolves,
The side surface of the frame 5 around the Oldham ring mechanism 12 receives the thrust of the roller.

The outer peripheral surface of the roller 11 and the cylinder case 10
The rolling contact position with the inner peripheral surface of A gradually moves in the circumferential direction, and the blade 14 moves in and out of the spiral groove 13 and moves in the radial direction of the roller 11.

By a series of these operations, the low-pressure refrigerant gas is directly guided from the evaporator to the compression chamber 15 as the suction portion S via the suction refrigerant pipe Pb. After the blade 14 is formed in a spiral shape, the blade 14 is sequentially transferred to the compression chamber 15 on the side of the discharge section D with the revolving motion of the roller 11.

Because of the pitch shape of the blades 14, the volume of the compression chamber 15 is sequentially reduced from the suction section S to the discharge section D, so that the refrigerant gas is compressed while being sequentially transferred through each compression chamber 15. Then, the pressure in the compression chamber 15 on the discharge section D side is increased to a predetermined pressure.

High-pressure gas is discharged from the compression chamber 15,
The space fills the space on the bottom surface side of the closed case 1 through the discharge port 8a of the end plate 8, and is further guided from the discharge refrigerant pipe Pa to the condenser to perform a predetermined refrigeration cycle operation.

In this manner, the cylinder case portion 1 in which a part of the closed case 1 is also used as the cylinder of the compression mechanism 3
Since the rotary shaft 2 is supported by one bearing 6, the cost can be reduced by reducing the number of parts, and the overall weight and weight can be reduced.

Cylinder case 10 serving also as a cylinder
A and a stator case 1 for fitting and fixing the stator 21
Since the OBs are integrally formed, the center axes of the compression mechanism 3 and the electric motor 4 disposed therein can be accurately matched, and assembling accuracy can be improved. In particular, the air gap between the rotor 20 and the stator 21 constituting the electric motor unit 4 can be maintained uniformly, so that there is no need for the conventional centering work in the assembling work, and no bolts for assembling each part are necessary. Becomes

A helical blade type compressor as shown in FIG. 2 may be used. Sealed casing 1A has a predetermined length from the open end in the bottomed cylindrical body is the same large diameter as described above, the case body 1a ₁ to the bottom surface side via a step portion 30 of the intermediate portion is formed smaller in diameter And a lid plate 1b for closing the opening end.

The sealed casing 1A houses the compression mechanism portion 3A with the small diameter portion side of the case body 1a _1, the cylinder case portion 10A ₁ which also serves as a cylinder, the large-diameter side is fitted and fixed to the stator 21 of the motor unit 4 The stator case portion 10B is integrated with the stator case portion 10B. And these cylinder case parts 10
The border of A ₁ and the stator casing section 10B, the stepped portion 30
Is formed.

The roller 11A which is accommodated eccentrically in the cylinder case portion 10A ₁ is being formed step portion 35 in a position opposite to the step portion 30, from the frame 5 side is larger in diameter which, the end plate 8A side small diameter It has become. Blade 14
The spiral groove 13 into which is inserted is provided on the small-diameter side of the roller 11A, so that a compression chamber 15 is formed.

The compression mechanism 3 excluding the parts described above
Since all the configurations and dimensions and shapes such as A and the motor section 4 are the same as those described above with reference to FIG. 1, the same reference numerals are given and new description is omitted.

With such a configuration, in addition to the above-described effects, while securing the diameter of the mounting portion of the Oldham ring mechanism 12 of the roller 11A, the diameter of the portion where the spiral groove 13 is provided is made as small as possible. It can be formed into a small diameter, and the weight can be further reduced.

The case body 1a of the closed case 1A
₁ may be molded from a single piece by deep drawing, or the cylinder case portion 10A ₁ and the stator case 10
B may be separated and connected to each other at the step portion 30.

A helical blade type compressor shown in FIG. 3 may be used. As shown in FIG. 4, the sealed case 1B
Includes a cylinder case portion 10A ₂ constituting the cylinder of the compression mechanism portion 3B, it is split the stator 21 of the motor unit 4 and the stator casing section 10B ₂ for fitting and fixing.

The diameter of the cylinder case portion 10A ₂ is
A smaller diameter than the diameter of the stator casing section 10B _2, these cylinder case portion 10A ₂ and the stator casing section 10B ₂ are connected through a frame 5B.

The structure and geometry of the stator case portion 10B ₂ motor unit configured within 4 may be the same as those described above. The frame 5B outer diameter fitted tightly into the open end of the stator case section 10B _2, and the sealing process is performed over the entire circumference.

The cylinder case portion 10A _2, the open end is fitted tightly to the inner diameter of the frame 5B, the sealing process is performed over the entire circumference. Flange part 6 of bearing 6B
The outer diameter a is expanded to the coil end side of the stator 21 and is fixed to the frame 5B via the fixing screw 7. An Oldham ring mechanism 12B is provided between the inner diameter side and the end face of the roller 11B.

[0050] The roller 11B is a thrust receiving frame 6B one side, are housed eccentrically between the end plate 8B provided at predetermined intervals on the bottom surface of the cylinder case portion 10A _2.

One of the guides 6b of the bearing 6B is formed to be short. The rotating shaft 2B is supported by one bearing 6B, and the roller 11B is slidably fitted into the eccentric crank 2a. Is no different.

In the roller 11B having a smaller diameter than that described above, the pitch of the spiral grooves 13 provided on the peripheral surface is opposite to that of the above-described roller 11B and extends from the end plate 8B side to the frame 5B side. And gradually formed smaller. Accordingly, the end plate 8B is provided with the suction port 8b, and the frame 5B is provided with the discharge port 40 to which the discharge refrigerant pipe Pa is connected.

[0053] With such a structure, in conjunction with the effects of those described above, and the diameter of the cylinder case portion 10A _2, the roller 11B diameter and Oldham ring mechanism 12
The diameter of B becomes extremely small, so that further reduction in component material cost and weight can be obtained.

[0054] As shown in FIG. 5 (A), provided with a notch 50 in the open end of the cylinder case portion 10A _2, may be here to fit the blade stopper 51. As a result, even if the blade 14 tries to be displaced toward the frame 5B due to the revolving motion of the roller 11B, the blade stopper 51 suppresses the end of the blade 14 and reliably restricts the displacement.

Further, as shown in FIG. 5B, a blade stopper 52 may be integrally provided on a part of the side surface of the end plate 8B. Similarly, even if the blade 14 tries to displace in the direction of the end plate 8B due to the revolving motion of the roller 11B, the blade stopper 52 suppresses the edge of the blade 14 and reliably regulates it.

The helical blade type compressor in each of the above embodiments has been described as being applied to a horizontal type compressor. However, the present invention is not limited to this, and the rotating shaft is oriented in the vertical direction. A vertical compressor in which a compression mechanism and an electric motor are mounted on the upper and lower portions may be used.

[0057]

As described above, according to the present invention, the case accommodating the compression mechanism and the motor is also used as the cylinder of the compression mechanism, thereby reducing the number of components and reducing the cost. And the weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a helical blade type compressor showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a helical blade type compressor showing another embodiment.

FIG. 3 is a cross-sectional view of a helical blade type compressor showing still another embodiment.

FIG. 4 is an exemplary exploded cross-sectional view of the compression mechanism section, showing the embodiment;

FIG. 5 is a configuration diagram of different blade stoppers, showing the same embodiment.

[Explanation of symbols]

11, 11A, 11B: roller, 13: spiral groove, 15: compression chamber, 14: blade, 3, 3A, 3B: compression mechanism, 2, 2B: rotary shaft, 21: stator, 4: electric motor, 1 , 1A, 1B ... sealed case, 10A, _10A 1, 10A 2 _... cylinder case portion, 10B, 10B 2 _... stator case portion, 6,6B ... bearing member, 30 ... stepped portion, 35 ... roller stepped portion, 51 and 52 ... Blade stopper.

Claims (5)

[Claims] 1. A cylinder, a roller eccentrically disposed in the cylinder and performing an eccentric motion, a spiral groove provided on an outer peripheral surface of the roller, and the cylinder and the roller which are fitted in the spiral groove so as to freely enter and exit. A compression mechanism section having blades forming a plurality of compression chambers therebetween; a rotor connected to the compression mechanism section via a rotating shaft; arranged with a small gap on a peripheral surface of the rotor In a fluid compressor comprising: a motor portion including a stator; and a sealed case accommodating the compression mechanism portion and the motor portion, the sealed case includes a cylinder case portion and a motor portion that constitute a cylinder of the compression mechanism portion. A stator case portion for fitting and fixing the stator is integrated, and the cylinder case portion and the stator case portion are formed to have the same diameter as each other. The one bearing member to be attached, the fluid compressor, characterized in that the rotating shaft is rotatably supported. 2. A cylinder, a roller which is eccentrically arranged in the cylinder and performs an eccentric motion, a spiral groove provided on an outer peripheral surface of the roller, and the cylinder and the roller which are fitted into the spiral groove so as to be able to come and go freely. A compression mechanism section having blades forming a plurality of compression chambers therebetween; a rotor connected to the compression mechanism section via a rotating shaft; arranged with a small gap on a peripheral surface of the rotor In a fluid compressor comprising: a motor portion including a stator; and a sealed case accommodating the compression mechanism portion and the motor portion, the sealed case includes a cylinder case portion and a motor portion that constitute a cylinder of the compression mechanism portion. A stator case portion for fitting and fixing the stator is integrated, and the diameter of the cylinder case portion is formed smaller than the diameter of the stator case portion. The step portion bordering the over scan portion and the stator case portion, a fluid compressor stepped portion provided on the roller and wherein the opposed position. 3. A cylinder, a roller eccentrically disposed in the cylinder and performing an eccentric motion, a spiral groove provided on an outer peripheral surface of the roller, and the cylinder and the roller which are fitted in the spiral groove so as to be able to enter and exit freely. A compression mechanism section having blades forming a plurality of compression chambers therebetween; a rotor connected to the compression mechanism section via a rotating shaft; arranged with a small gap on a peripheral surface of the rotor In a fluid compressor comprising: an electric motor section including a stator; and a sealed case accommodating the compression mechanism section and the electric motor section, the closed case includes a cylinder case section forming a cylinder of the compression mechanism section and the electric motor section. And a stator case part for fitting and fixing the stator. The cylinder case part diameter is smaller than the stator case part diameter. A fluid compressor wherein the portion and the stator case portion are connected via a frame, and the rotating shaft is supported by one bearing attached to the frame. 4. The roller according to claim 1, wherein a position of one end of said roller is regulated by an end plate, and said end plate is provided with a blade stopper for regulating a circumferential displacement of said blade. Item 4. A fluid compressor according to any one of Items 3. 5. A notch portion is provided at an end portion of said cylinder case portion, and a blade stopper is provided at said notch portion for restricting circumferential displacement of said blade. A fluid compressor as described.