JPH06299980A - Rotary compressor - Google Patents

Abstract

PURPOSE:To improve the compression efficiency and save the power by expanding the part in contact with the inner surface of a stator of a vane to the side where the vane is rotated, providing a notch in the rotor to insert the expanded part so that the vane may not be separated from the inner surface of the stator. CONSTITUTION:As the shaft 23 of a rotor 2 is rotated, the head part of a vane 3' equipped in a groove 17 of the rotor 2 is rotated by the centrifugal force while being brought into contact with the inner surface 24 of the stator 2, and the air flowed in from an air inlet 4 is discharged from a discharge port 5. The expanded part 6 of the head of the vane 3' is arranged in the rotational direction, and the vane 3' is constantly slid by this action while being brought into contact with the inner surface 24 of the stator and not separated from the inner surface 24 of the vane 3'. The expanded part 6 of the vane 3' is inserted into the notch 6' within the rotor, resulting in no obstruction of the rotation of the rotor. This constitution improves the power efficiency, and improves the durability of the machinery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor for compressing a gas such as air, and more particularly to a vane rotary compressor having a structure in which a rotor holding a vane is rotated in an outer cylinder called a stator. It is a thing.

[0OO2]

2. Description of the Related Art Conventionally, as shown in FIG. 2, in a vane type rotary compressor, the volume of air (gas) introduced from an inlet 4 is reduced by a vane 3 when the rotor 2 rotates in the direction of 7. As a result, the air in this volume is compressed and becomes a high pressure, exits from the outlet 5 into the space 14, and passes through the passage 1
2. It is sent out from the air outlet 15 through the oil separator 13. During this time, the lubricating oil is sent from the oil inlet 8, is pushed out from the outlet 5 together with the air, is stored in the oil tank 11 and is taken out together with the air and in the passage 12 is separated from the air by the oil filter 13. Further, since the oil is returned to the inlet of the compression chamber and the oil tank is constantly compressed by compressed air, the oil is cooled by the oil cooler 10 while the oil flows from the oil tank to the oil inlet 8 again through the oil pipe 9. It has become like.

With such a mechanism, the conventional vane compressor reduces the sliding friction between the rotor and the vane, the vane and the stator, and seals against the leakage of air between the vane and the stator, and the stator by the circulation action of oil. The heat generated inside is removed to keep the temperature low.

Further, the sliding portion between the vane, the rotor and the stator is improved so that the friction due to the sliding is reduced and the air compression can be performed as efficiently as possible.

Further, as shown in FIG. 3, the oil groove 16 is cut along the radial direction of the rotor at some points of the vane, and lubrication between the vane and the rotor is performed to reduce friction between the vane 3 and the rotor groove 17. is doing.

Also, as shown in FIG. 1, the vane is pressed against the rotor by centrifugal force and rotates to seal the air. Therefore, as described above, the friction due to the sliding is reduced by the lubrication and precision machining, and the wasteful energy loss is caused. I try to reduce.

Despite the use of the technique described in the preceding paragraph, the efficiency of an air compressor uses three times the power of isothermal compression work. Although there are various causes for this, the present invention improves the thermodynamic efficiency of the air compressor by preventing air leakage due to the head of the vane 3 being separated from the inner surface of the stator 1.

The fourth time is when the vane 18 has just come to the outlet 5, and the compressed air from the outlet 5 flows backward from the outlet 5 to the portion 21 partitioned by the vane 18 and the vane 19. Come on. At this position, the pressure of the compressed air in the partition space 21 is relatively low and Po is 7.5 kg / c.
When m (gauge G), generally 2.5 kg / cm
It's only up to (G). Then vane 1
The pressure Pm of the partition space 22 between 9 and 20 is about 0.5 kg
/ Cm (G). If the point C of the head of the vane 19 is in contact with the inner surface of the stator 1, the pressure P is maintained between co.
While o is working and cm is working, the pressure Pm works to lower the vane 19 downward. Moreover, the bottom of the vane 19 is pushed up by the oil groove 16 due to the pressure Pm, but Po is Pm.
Since it is very large, the vane 19 is pressed down by overcoming the pressing action by the centrifugal force, and the air in the partition chamber 21 flows into 22.

A part of the air flowing from the chamber 21 into the chamber 22 is the air that has already been compressed to Po and leaks,
Since the compressor recompresses, it obviously causes a large loss of power.

Also, since the head of the vane and the inner surface of the stator are worn away from the point of contact, the shape of the vane head slides while being adapted to the rotor contact surface during use. It is unavoidable that the part is separated from the inner surface of the stator.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compressor which can eliminate the above-mentioned loss, improve the efficiency of the compressor, and save power.

[0011]

In order to solve the above problems, the present invention employs the following rotary compressor. That is, the rotary compressor according to the claims has a groove 1 installed in a rotor 2 rotating in a cylindrical bore of a stator 1 in a substantially radial direction.
The vane 3 is installed in the rotor 7, and the vane 3 slides in contact with the substantially cylindrical inner surface of the stator 1 according to the rotation of the rotor 2 to compress the air flowing in from the air (gas) inlet 4 to compress it. In the vane compressor that discharges to the outlet, vane 3
Part of the stator that contacts the inner surface of the stator (called the vane head)
A rotary compressor characterized in that an enlarged vane is installed on the rotating side of the vane as shown in 6, and a notch 6'is formed in the rotor so that the enlarged portion of 6 can be inserted.

[0012]

In the rotary compressor according to claim 1 of the present invention, as shown in FIG. 5, the head of the vane 3'expands in the direction of rotation, and the pressure Po is co and the pressure Pm is cm. It takes time to push down the vane 19, but the pushing force is Pm to the bottom surface, and Po pushes up to the lower surface oc 'of the enlarged portion once, so if the positions of c and c'are brought close to each other, oc and o.
If c'is made the same, the force due to the pressure is substantially balanced in the upward and downward directions, so that the vane 19 is always pressed against the stator by the centrifugal force. Therefore, even if the outlet pressure suddenly enters, the vane 19 is always in close contact with the inner surface of the stator, so that air leakage does not occur.

Due to the effect of the enlarged portion 6 for the above reason,
Stable compression is always possible, useless power consumption is small, and the effect of the present invention is that the re-compressed air is reduced. Therefore, power saving and compressor temperature rise are reduced.

Also, the head of the vane is provided with an enlarged portion of 6 3 '
The vane has a weight that is not much different from the vane 3 that does not have an enlarged portion, so the centrifugal force is not much different, so the force pressed on the stator does not change much, the difference in sliding resistance is small, and air leakage Is almost gone.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 is a diagram showing a vane compressor according to the present invention. The shaft 23 of the rotor 2 rotates in the 7 direction. Along with the rotation, the head of the vane 3 ′ installed in the groove 17 of the rotor 2 rotates while coming into contact with the inner surface 24 of the stator 2 by the centrifugal force, and the air flowing in from the air inlet 4 is compressed. Discharge from the discharge port. The head of the vane 3'has the enlarged portion 6 in the rotational direction. By the action of this 6,

The vane 3'is always the inner surface 2 of the stator as shown in FIG.
4, the vane does not separate from the inner surface 24 unlike when the vane 3 shown in FIG. 4 is used.

The enlarged portion 6 of the vane 3'has a vane position of 2
When you come to 5, insert into the notch 6'in the rotor,
It will not hinder the rotation of the rotor.

FIG. 7 and FIG. 8 are views for explaining the operation of the embodiment. Figure 8 shows the case of the conventional vane,
In this case, the force for separating the head surface mco of the vane from the stator surface 24 is D = cm × Pm + co × Po,
On the contrary, the force U = (mc + c) for pressing the face mco on the face 24
o) × Pm + Fc (centrifugal force moving to vane), and D−
Since U (distance) = co (Po-Pm) -Fc, when (Po-Pm) becomes large, the mco surface becomes mlclol.
Is lowered to the surface of Po and the air of Po flows toward Pm.
When m decreases, the surface of mco comes into contact with FIG. 24 again, but it is unavoidable that the air of Po leaks to Pm. FIG. 7 shows the action in the case of the present invention, and the force of separation D = mcPm + coPo and the force of pressing U = m.
c′Pm + c′oPo + Fc. Separation force DU =
Pm (mc-m'c) + Po (co-c'o) Po-F
Since it is c, if the position of c'is taken in the same way as c, DU =
Since the pushing force is always greater than the releasing force at -Fc, air will not leak from Po to Pm or is very small.

In the case of pressing by the centrifugal force, when the head contact length mco is the same when comparing the vane of the present invention and the conventional vane, it is apparently mo> mc ', so that the vane applied to the inner surface of the stator is Since the centrifugal force of the present invention is small and the sliding pressure is small, the sliding friction is small and the power is saved.

[0018]

As described above, according to the rotary compressor of the present invention, the rotary compressor of the invention has a substantially radial direction in the rotor 2 rotating in the cylindrical bore of the stator 1. The vane 3 ′ is installed in the groove 17 installed in the above, and the vane 3 ′ is brought into contact with the substantially cylindrical inner surface 24 of the stator according to the rotation of the rotor, and slides to remove the inflowing air from the gas (for example, air) inlet. In the vane compressor that compresses and discharges from the discharge port of 5, the stator inner surface 2 of the vane 3 '
As shown in Fig. 6, a vane 3'where the portion 6 (which is called the head of the vane) which contacts 4 is enlarged on the rotating side of the vane, and a notch 6'is formed in the rotor so that the enlarged portion of 6 is formed. Since it is a rotary compressor characterized by being able to be inserted, no matter what the difference in pressure before and after the direction of rotation of the vane, the vane 3'is never separated from the inner surface of the stator. Therefore, even if the gas (air) compression is very small and efficient, it can be performed.

As described above, the present compressor eliminates the air leakage found in the conventional compressor in the vicinity of the gas outlet of the compression chamber, and has less recompression (leaked air) work as compared with the conventional compressor. Or, it is possible to eliminate wasteful work, reduce heat generation, improve power efficiency, and improve machine durability.

[Brief description of drawings]

1 is a diagram showing a compression principle of a vane type rotary compressor, 3 is a vane of a conventional rotary compressor, and 3'is an example of a vane used in the rotary compressor of the present invention. Show.

FIG. 2 is a schematic configuration diagram of an embodiment of a vane type rotary compressor.

FIG. 3 shows an embodiment of a vane device of a vane type rotary compressor and a cross-sectional view of the vane.

FIG. 4 is an explanatory diagram of an example of gas pressure applied to a vane in a (conventional) vane type rotary compressor.

FIG. 5 is an explanatory diagram of an example of gas pressure applied to a vane used in the present invention in a vane type rotary compressor (of the present invention).

FIG. 6 is a schematic configuration diagram showing a compression principle of the rotary compressor of the present invention.

FIG. 7 is a drawing showing the external pressure received by the vane of the rotary compressor of the present invention.

FIG. 8 is a drawing showing an external pressure received by a vane of a conventional rotary compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 3 Conventional vane 3'Vane of the present invention 4 Gas inlet 5 Gas outlet 6 Enlarged head of vane 6'6 Notch of rotor to be inserted 7 Rotation direction 8 Oil inlet 9 Oil pipe 10 Oil cooler 11 Oil tank 12 Passage 13 Oil filter 14 Space 15 Air (gas) outlet 16 Oil groove 17 Groove (vane groove) 18 Vane 19 Vane 20 Vane 21 Partition space 22 Partition space 23 Rotor shaft 24 Stator inner surface 25 Rotation position c, m, o, c ' , Cl, ol, ml ... points on the vane head Po and Pm are pressures U and D are forces

Claims (1)

[Claims] 1. A vane 3'is provided in a groove formed substantially in a radial direction in a rotor 2 rotating in a cylindrical bore of a stator 1, the vane 3'corresponding to the rotation of the rotor. In the vane compressor that slides in contact with the inner surface of the cylinder and compresses the air that has flowed in from the air (gas) inlet 4 and discharges it from the outlet of 5, the portion that contacts the inner surface of the stator of the vane 3 '(referred to as the head of the vane). ) Install the enlarged vane 3'on the side where the vane rotates as shown in FIG.
Further, the rotary compressor is characterized in that a 6'notch is formed in the rotor so that the enlarged portion of 6 can be inserted.