JPH0599170A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent the increase of incurring of a pressure loss during suction by which a trouble is caused when the length in a longitudinal direction of a cylinder is intended to be decreased. CONSTITUTION:The length, in the peripheral direction of a cylinder, of a suction hole 26 is increased to a value higher than length in the longitudinal of the cylinder. Namely, the hole area of a suction hole 26 can be made equal to that of roundness in a way that the suction hole 26 is formed in a so-called laterally long shape. Simultaneously with the decrease in a longitudinal direction of a cylinder direction 20, the increase of incurring of a pressure loss can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used in an air conditioner or the like, and relates to a pressure loss reduction measure when a fluid is sucked.

[0002]

2. Description of the Related Art A rotary compressor, for example, a rolling piston compressor, which is one type of rotary compressor, is disclosed in Japanese Patent Laid-Open No. 63-1.
As disclosed in Japanese Patent No. 67095, while a roller housed in a cylinder rotates along an inner peripheral surface of the cylinder, a blade provided on the cylinder always abuts on the roller, and a contact between the roller and the cylinder is made. Points and
By changing the working chamber formed between the blade and the blade, each process of suction, compression and discharge of a fluid such as a refrigerant gas is performed.

The cylinders on both sides of the blade are
A suction hole and a discharge hole are bored, and the fluid is sucked into the working chamber through the suction hole, is pressurized, and is delivered from the discharge hole.

Further, while the shape of the suction hole is usually formed in a perfect circle, the hole area is too large and fluid leakage does not occur.
It is set to a certain size so that it is not too small and pressure loss does not matter.

[0005]

In the rolling piston type compressor, the smaller the vertical height of the cylinder, the higher the efficiency. For example, if the volume is the same, multiple cylinders are more advantageous in terms of efficiency. Is known to reduce the vertical height of the cylinder. However, since the shape of the suction hole is a perfect circle, if the vertical height of the cylinder decreases, the hole diameter of the suction hole must be reduced to prevent fluid leakage, and the pressure loss in the suction hole is correspondingly reduced. There is a problem of increase.

Further, in the discharge hole, the hole volume becomes the top clearance, and at the closing point where the contact point passes through the discharge hole, the discharge hole opens in the suction chamber which is the working chamber of the suction stroke and discharges. The high temperature, high pressure and high density fluid remaining in the holes flows into the suction chamber and re-expands. For this reason, the pressure in the suction chamber rises above the suction pressure by the amount of the inflow of this fluid, and before the contact point closes the suction hole, the fluid once sucked into the suction chamber flows back into the suction hole. Inhalation backflow leak had occurred. When this backflow leakage occurs, the suction volume of the suction chamber decreases and the volumetric efficiency decreases.

Therefore, in order to prevent this suction backflow leakage, it is sufficient to close the suction hole before the pressure rise due to the inflow of the fluid reaches the suction hole position, that is, as soon as possible after closing the discharge hole. Just close the suction hole. For that purpose, as shown in FIG. 2, the suction closing angle θ, which is the angle from the blade center line to the closing point of the suction hole, should be made as small as possible, but under the present circumstances where the shape of the suction hole is a perfect circle. However, there is a limit to bringing the suction hole closer to the blade side. Therefore, in order to reduce the closing angle θ without changing the perfect circular shape, there is no choice but to reduce the hole diameter, and there is a problem that the pressure loss increases if the hole diameter is reduced.

When a pressure loss occurs during suction, the shape of the suction hole is a perfect circle. For example, when the compressor is used in an air conditioner, the suction gas pressure of the compressor is the outlet pressure of the evaporator. Therefore, the specific volume is increased, and the refrigerant mass sucked by the compressor is reduced. Therefore, the volume efficiency is lowered, and the cooling capacity is reduced.

Thus, if the vertical height of the cylinder and the suction closing angle are attempted to be reduced while keeping the shape of the suction hole as a circle, the volume efficiency is lowered due to the pressure loss,
There is a problem that the effects of these improvements are offset.

The present invention has been made in view of the above point, and solves an increase in pressure loss at the time of suction, which is a problem when an attempt is made to reduce the length in the longitudinal direction of the cylinder and the closing angle of suction. The purpose is to

[0011]

In order to achieve the above-mentioned object, the means taken by the invention according to claim 1 is to make the suction hole laterally long, so that the longitudinal direction of the cylinder is prevented without causing pressure loss. It reduces the length.

Specifically, as shown in FIG. 1, the means taken by the invention according to claim 1 is such that a motor (2) and a compression section (3) are housed inside a casing (1), The compression section (3) is housed in the cylinder (12) and the roller (13) housed in the cylinder (12) and connected to the motor (2) to rotate along the inner peripheral surface of the cylinder (12). When,
A blade (16) for partitioning a working chamber (25) formed between the cylinder (12) and the roller (13) is provided, and low pressure fluid is supplied to the working chamber (25) in the cylinder (12). It is premised on a rotary compressor in which a suction hole (26) to be introduced and a discharge hole (27) for discharging the pressurized fluid from the working chamber (25) are formed.

Then, specifically, as shown in FIG.
The suction hole (26) is not a perfect circle, and the length in the cylinder circumferential direction is set larger than the length in the cylinder vertical direction.

Further, the means taken by the invention according to claim 2 is to reduce the suction closing angle without causing pressure loss by making the suction hole so long as it is.

Specifically, in addition to the above rotary compressor, as shown in FIG. 6, the suction hole (26) is configured such that the length in the cylinder longitudinal direction is set larger than the length in the cylinder circumferential direction. ..

[0016]

With the above structure, according to the invention of claim 1, when the roller (13) rotates, the working chamber (25) formed between the cylinder (12) and the roller (13) is
It is divided into a low pressure chamber and a high pressure chamber by a blade (16). Fluid is sucked into the low pressure chamber through the suction hole (26), while in the high pressure chamber, the suction fluid is pressurized and sent out through the discharge hole (27).

On the other hand, the suction hole (26) is so set that its length in the cylinder circumferential direction is longer than its length in the cylinder vertical direction, that is, it is laterally long. Therefore, the suction hole (26)
Since the hole area that affects the pressure loss can be made the same as in the case of a perfect circle, the length in the cylinder vertical direction can be reduced and at the same time, the increase in pressure loss can be suppressed.

According to the second aspect of the invention, the length in the cylinder vertical direction is set to be longer than the length in the cylinder circumferential direction, that is, the length is long. Therefore, the discharge hole (27)
The rotation area of the contact point CP from the suction hole (26) to the suction hole (26) is shortened, and the suction backflow leakage can be reduced, and at the same time, the same hole area as the perfect circle can be secured to increase the pressure loss. Can be suppressed.

[0019]

As described above, according to the first aspect of the present invention, by making the suction hole (26) laterally long, a hole area equivalent to that of a perfect circle suction hole (A) is secured. You can Therefore, the length in the vertical direction of the cylinder can be reduced without incurring the inconvenience of fluid leakage, and at the same time, an increase in pressure loss can be suppressed, so that high efficiency can be achieved.

According to the second aspect of the invention, by making the suction hole (26) laterally long, it is possible to reduce the suction backflow leakage and at the same time suppress the increase of the pressure loss. Volumetric efficiency can be improved.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show a first embodiment of the invention according to claim 1. FIG. 1 shows the structure of a rolling piston compressor, which is one type of rotary compressor. The rolling piston type compressor is provided, for example, in an air conditioner, and includes a closed barrel-shaped casing (1), a motor (2) and a compression unit arranged above and below the casing (1). And a compression unit (3). The motor (2) comprises a rotor (8) and a stator (9), and drives the compression unit (3) with the power of the motor (2) to compress the refrigerant as a fluid.

The interior of the casing (1) is divided by the compression unit (3) into a lower oil chamber (4) and an upper gas chamber (5). The interior of the gas chamber (5) is below the primary space (5a) by the motor (2).
And an upper secondary space (5b). These two spaces (5a), (5b) are separated by a small gap (E) between the rotor (8) and the stator (9). Communicate with each other. An elbow-shaped gas outlet pipe (10) is provided on the upper wall of the casing (1) facing the secondary space (5b).

As shown in FIGS. 1 and 2, the compression unit (3) includes a cylinder (12) and a cylinder (1).
2) A roller (13) housed inside and rotating along the inner peripheral surface of the cylinder (12), a front muffler (15) provided on the outer surface of the cylinder (12), and provided on the cylinder (12). And a blade (16) biased inwardly so as to abut the roller (13). The roller (13) is connected to the rotor (8) of the motor (2) via the drive shaft (17).

The cylinder (12) comprises a cylinder body (20) made of a cylindrical metal block, a front plate (21) and a rear plate (22) for closing the upper and lower ends of the cylinder body (20), Laura (1
A working chamber (25) is formed between the working chamber (3) and 3).

The blade (16) is housed in the cylinder body (20), and as shown in FIG. 2, the suction hole (26) and the discharge hole (2) are provided on both sides of the blade (16).
7) and are provided.

The suction hole (26) is provided in the cylinder body (2
The gas suction pipe (30) for introducing suction gas from the outside is communicated with the inside of the cylinder (12). As shown in FIG. 3, the suction hole (26) is formed in a horizontally long ellipse having a predetermined hole area as a feature of the present invention, and the length in the cylinder circumferential direction is larger than the length in the cylinder vertical direction. It is set.

The hole area of the suction hole (26) is set to be the same as the hole area when the length of the cylinder body (20) in the longitudinal direction is not intended to be reduced, that is, only the shape is a horizontally long ellipse. By being formed, the length in the cylinder direction is shortened.

Further, in the suction hole (26), as shown in FIG. 3, the closing point a, which is the tip in the direction of rotation of the roller (13), is located at the closing point of the perfect circular suction hole (A). Is set to.

The other end of the gas suction pipe (30) is connected to the outlet pipe of a liquid separator (not shown). As shown in FIG. A perfect circle part (30a) and an elliptical part (30) corresponding to the holes (26).
b) is formed, and a deformed portion (30c) having the same hole area and gradually changing from a perfect circle to an ellipse is formed.

On the other hand, the discharge hole (27) is formed in the front plate (21) above the inner peripheral edge of the cylinder body (20) as shown in FIG. 4, and the upper end of the discharge hole (27) is formed. It is designed to be opened and closed by the reed valve (31). On the other hand, the inner end of the discharge hole (27) is connected to the cylinder body (2
The inner peripheral edge of (0) is formed in a guide portion (32) which is cut out in a conical shape at an angle of 45 °. Discharge hole (27)
, The high-temperature high-pressure high-density gas refrigerant remains without being discharged, and becomes the top clearance (35).

The roller (13) is accommodated in the cylinder (12) with an upper and lower gap of about several tens of μm, and a fitting hole (36) is formed at the center thereof.
The eccentric shaft portion (37) of the drive shaft (17) is fitted in 6).

The drive shaft (17) is pivotally supported by a front plate (21) and a rear plate (22),
The upper end is connected to the rotor (8) of the motor (2), the eccentric shaft portion (37) is formed in the center thereof, and the lower end is provided with a centrifugal oil supply pump (not shown). The oil supply pump is immersed in the lubricating oil stored in the oil chamber (4), and the pump head (lift) of the oil supply pump supplies the lubricating oil to the gap of the movable portion of the compression unit (3).

Next, the operation of the compressor will be described.

The rotation of the motor (2) causes the roller (1
3) rolls and moves in a fixed direction along the inner peripheral surface of the cylinder body (20). And the contact point CP
Except when the opening of the suction hole (26) is closed, the working chamber (25) is partitioned by the blade (16) into a suction chamber (40) which is a low pressure chamber and a compression chamber (41) which is a high pressure chamber. .. While the refrigerant is sucked into the suction chamber (40) through the suction hole (26), the refrigerant is pressurized and discharged from the discharge hole (27) in the compression chamber (41).

On the other hand, since the suction hole (26) is a so-called horizontal ellipse whose length in the cylinder circumferential direction is large in the cylinder circumferential direction, it is a vertical ellipse of the cylinder body (20) without causing refrigerant leakage. The length in the direction can be reduced. On the other hand, the influence on the pressure loss of the suction hole (26) is larger than the hole shape, and even if the hole shapes are different, if the hole areas are the same, the pressure loss of the holes is not substantially different. Therefore, the horizontally long suction hole (26) of this embodiment can prevent an increase in pressure loss as compared with the perfect circular suction hole (A).

In this case, since the closing point a of the suction hole (26) is set so as to be located at the closing point of the perfect circular suction hole (A), the blade center line M is set to be horizontally long. To the closing point c of the suction hole (26) does not increase.

As described above, according to this embodiment, by making the suction hole (26) laterally long, a hole area equivalent to that of the perfect circle suction hole (A) can be secured. Therefore, the length of the cylinder body (20) in the vertical direction can be reduced without incurring the inconvenience of fluid leakage, and at the same time, an increase in pressure loss can be suppressed, so that high efficiency can be achieved. ..

In addition, the deforming portion (3
By providing 0c), it is possible to suppress an increase in pressure loss due to a change in the shape of the flow path.

Next, FIGS. 6 to 8 show a second embodiment of the invention according to claim 2. In this embodiment, the suction hole (26) is formed so as to be vertically long, so that suction backflow leakage is reduced without increasing pressure loss.

Specifically, as shown in FIG. 6, the suction hole (26) is formed in a vertically long shape having a predetermined hole area, and the length in the cylinder vertical direction is larger than the length in the cylinder circumferential direction. It is set.

The hole area of the suction hole (26) is set to the hole area when it is not intended to reduce the suction backflow leakage. Further, the suction center angle ω, which is the angle formed by the blade center line M and the upper and lower center lines (long axis of the ellipse) O of the suction hole (26), is the same as the suction center angle of the perfect circular suction hole (A). The settings are the same.

Here, the contact point CP between the cylinder body (20) and the roller (13) is the discharge hole (2
At the closing point a passing through 7), the gas refrigerant remaining in the top clearance (35) flows out into the suction chamber (40) and re-expands, which causes the suction volume to decrease.
The suction hole (26) is vertically elongated to expedite closing. The other structure is similar to that of the first embodiment.

Next, the operation of the compressor of this embodiment will be described.

The contact point CP has a discharge hole (2
7) when the suction chamber (4) is completely closed, as shown in FIG.
Low pressure refrigerant is sucked into the suction chamber (0) through the suction hole (26), and the suction chamber (40) has a low pressure. At this time, the discharge hole (27) is opened in the suction chamber (40), and the high-temperature, high-pressure and high-density gas refrigerant remaining in the top clearance (35) flows into the suction chamber (40) and the suction hole ( 26)
Head to. Therefore, during the movement of the contact point CP to the closing point a of the suction hole (26), the pressure rising region due to the inflow gas from the top clearance (35) expands.

On the other hand, since the length of the suction hole (26) in the longitudinal direction of the cylinder is longer than the length in the circumferential direction of the cylinder, so to speak, the suction closing angle θ becomes small, that is, the discharge hole. From (27) to suction hole (2
The rotation area of the contact point CP up to 6) will be shortened. Therefore, the suction hole (26) is completely closed before the pressure rising region reaches the suction hole (26), or, as shown in FIG. 8, the suction gas does not leak even after reaching the suction hole (26). To minimize backflow leakage. At the same time, the suction hole (2
Since the hole area of 6) is the same as a perfect circle, it is possible to suppress an increase in pressure loss.

Then, the center of the suction hole (suction center angle) O is moved to the blade side up to the suction start point b of the suction hole (26) shown in FIG. 6 by the lengthwise length of the suction hole (26). In addition, the suction closing angle θ
Can be reduced.

As described above, according to the present embodiment, by making the suction hole (26) laterally long, it is possible to reduce backflow leakage by suction without inconvenience of increased pressure loss, and improve volumetric efficiency. can do.

The rotary compressor of the present invention may be a vane type rotary compressor, or may be a multi-cylinder type.

The shape of the suction hole (26) in the first and second embodiments may be other than elliptical, for example, rectangular or triangular.

[Brief description of drawings]

FIG. 1 is a sectional view of a rolling piston type compressor showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged view of the vicinity of the suction hole of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a perspective view of a gas suction pipe according to the first embodiment of the present invention.

FIG. 6 shows a second embodiment of the present invention and is a view corresponding to FIG.

FIG. 7 is a conceptual diagram showing the inflow state of gas from the top clearance according to the second embodiment of the present invention.

FIG. 8 is a conceptual diagram showing a second embodiment of the present invention and showing backflow leakage by suction.

[Explanation of symbols]

 1 casing 2 motor 3 compression unit (compression part) 12 cylinder 13 roller 16 blade 25 working chamber 26 suction hole 27 discharge hole

Claims (2)

[Claims] 1. A motor (2) inside a casing (1)
And a compression unit (3) are housed, the compression unit (3) is housed in the cylinder (12) and in the cylinder (12), and is connected to the motor (2) to be connected to the cylinder (12). Roller that rotates along the inner surface (1
3) and a blade (16) for partitioning a working chamber (25) formed between the cylinder (12) and the roller (13).
And a low pressure fluid is supplied to the working chamber (2) in the cylinder (12).
5) In a rotary compressor having a suction hole (26) introduced therein and a discharge hole (27) for discharging a pressurized fluid from the working chamber (25), the suction hole (26) is A rotary compressor characterized in that a length in a cylinder circumferential direction is set to be larger than a length in a cylinder longitudinal direction. 2. A motor (2) inside the casing (1).
And a compression unit (3) are housed, the compression unit (3) is housed in the cylinder (12) and in the cylinder (12), and is connected to the motor (2) to be connected to the cylinder (12). Roller that rotates along the inner surface (1
3) and a blade (16) for partitioning a working chamber (25) formed between the cylinder (12) and the roller (13).
And a low pressure fluid is supplied to the working chamber (2) in the cylinder (12).
5) In a rotary compressor having a suction hole (26) introduced therein and a discharge hole (27) for discharging a pressurized fluid from the working chamber (25), the suction hole (26) is A rotary compressor characterized in that a length in a cylinder longitudinal direction is set to be larger than a length in a cylinder circumferential direction.