JP2002303271A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor capable of reducing noise while maintaining performance. SOLUTION: The compressor 1 has a high pressure space 10, a sealed low pressure space 42, communication holes 50 and 52 communicating the high pressure space 10 and the sealed low pressure space 42, an end opening 54 of the communication hole 52 facing the high pressure space, and a check valve 58 provided with a closing face 66 closing the end opening 54 by moving toward the end opening 54 for cutting off a gas flow from the high pressure space 10 to the sealed low pressure space 42. The check valve 58 has an attitude inclining means 70 inclining the closing face 66 to the end opening 54 when the closing face 66 moves toward the end opening 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, and more particularly, to a compressor provided with a check valve for shutting off a gas flow from a high pressure space to a low pressure space.

[0002]

2. Description of the Related Art Compressors used for refrigeration or air conditioning are known, and a scroll compressor as an example of such a compressor is disclosed in Japanese Patent Publication No. 2959246. FIG. 9 is a partial vertical sectional view of the scroll compressor 80. The scroll compressor 80 communicates the high-pressure chamber 82, a closed compression chamber 84 that can be a closed low-pressure chamber, and the high-pressure chamber 82 and the closed compression chamber 84, and sends the gas compressed by the closed compression chamber 84 to the high-pressure chamber 82. The discharge hole 86 for discharging, the end opening 88 of the discharge hole 86 facing the high-pressure chamber 82, and the end opening by moving toward the end opening 88 to block the backflow of gas from the high-pressure chamber 82 to the closed compression chamber 84. A non-return valve 92 having a closing surface 90 for closing 88. Check valve 9
When the closing surface 90 of the second closes the end opening 88, the check valve 92
The closing surface 90 moves straight and sharply toward the end opening 88 of the discharge hole 86 to completely close the end opening 88 of the discharge hole 86, and the closing surface 90 is seated on the seating surface 94 including the end opening 88. At this time, the closing surface 90 excites the seating surface 94 to generate an impact sound, and as a result, noise is generated in the scroll compressor 80.

In order to reduce this noise, a check valve 92 is provided.
Is formed of an elongated elastic plate, and the end opening 8 of the discharge hole 86 is formed.
8 is arranged so as to be located at the longitudinal central portion 96 of the check valve 92. FIG. 10 is a plan view of the check valve 92, and FIG. 11 is a partial longitudinal sectional view of the scroll compressor 80 in a state where the check valve 92 is open. As shown in FIG. 11, a check valve 92 having one end 98 fixed thereto has an end opening 88.
Is open, only the central portion 96 of the check valve 92 is raised, and the other end 99 of the check valve 92 remains seated on the seating surface 94. Therefore, the lift amount of the check valve 92 is reduced, and the vibration of the seating surface 94 when the closing surface 90 of the check valve 92 is seated on the seating surface 94 is reduced.
The impact noise is reduced, and the noise of the scroll compressor 80 is reduced.

Another scroll compressor for reducing noise is disclosed in Japanese Patent Application Laid-Open No. 2000-110744. Although this scroll compressor (not shown) also has an elongated elastic plate-like check valve fixed at one end, instead of changing the arrangement of the end opening of the discharge hole with respect to the check valve, the end of the discharge hole is changed. By increasing the diameter of the opening or inclining the discharge hole, the velocity of the compressed gas discharged from the end opening of the discharge hole is reduced. Thereby, the lift amount of the check valve is reduced. For this reason, when the closing surface of the check valve moves straight and abruptly toward the end opening of the discharge hole to completely close the end opening of the discharge hole, when the closing surface of the check valve is seated on the seating surface. The vibration of the seating surface is reduced, thereby reducing the impact noise and reducing the noise of the compressor.

[0005]

However, in order to reduce the noise of the compressor 80, the arrangement of the end opening 88 of the discharge hole 86 with respect to the check valve 92 is changed or the discharge hole 86 is reduced.
If the lift amount is reduced by changing the diameter or inclination of the compressor, the flow path of the compressed gas flowing from the discharge hole 86 to the high-pressure chamber 82 will be narrowed, and the performance of the compressor 80 will be reduced.

The cause of the noise is that the check valve 92 is
Not only is the vibrating force 4 applied, but also the shock pressure waves that occur when the closing surface 90 of the check valve 92 fully closes the end opening 88 of the discharge hole 86. This will be described with reference to FIG. The closing surface 90 of the check valve 92 is
When closing the end opening 88, the closing face 90 of the check valve 92 is closed.
Moves straight and abruptly toward the end opening 88 of the discharge hole 86, and sits on the seating surface 94, and the end opening 88 of the discharge hole 86.
Is closed all at once. As a result, an impulsive pressure wave is generated due to a sudden change in the momentum of the backflow gas. The pressure wave propagates through the discharge hole 86 to the sealed compression chamber 84 formed by the pair of scrolls 100, 8
The acoustic mode determined by the shape of No. 4 is excited. The vibration due to the pressure wave increased by the excitation of the acoustic mode propagates through the components of the scroll compressor 80 such as the pair of scrolls 100 to the sealed housing 102, and as a result,
The noise radiated from the sealed housing 102 increases.
Therefore, when the closing surface 90 of the check valve 92 of the scroll compressor 80 is seated on the seating surface 94, the noise due to the vibration of the seating surface 94 is reduced, but the noise due to the shock pressure wave is reduced. Still exists.

Accordingly, an object of the present invention is to provide a compressor which can maintain the performance as a compressor and reduce noise.

[0008]

To achieve the above object, a compressor according to the present invention comprises a high-pressure space, a closed low-pressure space, a communication hole communicating the high-pressure space and the closed low-pressure space, and a high-pressure space. The end opening of the communicating hole facing,
A check valve with a closing surface that closes the end opening by moving toward the end opening to shut off gas flow from the high pressure space to the enclosed low pressure space. It is characterized in that it has a posture inclining means for inclining the closing surface with respect to the end opening when the closing surface moves toward the end opening.

According to such a configuration, when the pressure in the high-pressure space is higher than the pressure in the closed low-pressure space, the closing surface of the check valve moves toward the end opening of the discharge hole to close the end opening. Closed, thereby blocking gas flow from the high pressure space into the closed low pressure chamber. When the closing surface moves toward the end opening, the closing surface is inclined with respect to the end opening by the attitude inclination means of the check valve, and moves toward the end opening in the inclined state. Thus, when the closing surface reaches the end opening, the end opening is almost closed by the closing surface,
There is a gap between the closing surface and the end opening. The closing surface then fully closes the end opening and the ramp is returned. Due to the gap created between the closing surface and the end opening, the sudden pressure rise in the discharge hole is reduced, thereby reducing the shock pressure wave and the closed compression chamber caused by the shock pressure wave. Of the acoustic mode is suppressed. As a result, noise of the compressor can be reduced.

In the above compressor, the check valve has an elongated plate shape and has one end portion fixed and another portion including a closed surface, and the other portion is checked by the attitude tilting means. It may be asymmetric with respect to the longitudinal axis of the valve.

In the compressor constructed as described above, one end of the check valve is fixed, and the other part including the closed surface moves toward the end opening of the discharge hole.
The other part is asymmetrical with respect to the longitudinal axis of the check valve by the attitude tilting means. For this reason, when the closing surface of the check valve moves toward the end opening of the discharge hole, the posture of the other parts is determined by the difference in gas resistance or the difference in weight caused by the asymmetry about the longitudinal axis of the check valve. Inclined, whereby the closing surface moves towards the end opening in a state inclined with respect to the end opening. Thus, when the closing surface reaches the end opening, a gap is created between the closing surface and the end opening, although the end opening is substantially closed by the closing surface. As a result, as in the case described above, the shock pressure wave is reduced, and the excitation of the acoustic mode in the closed compression chamber caused by the shock pressure wave is suppressed, thereby reducing the noise of the compressor. Can be.

[0012] The attitude tilting means may have a planar shape formed asymmetrically with respect to the longitudinal axis of the check valve,
The thickness may be asymmetrically formed with respect to the longitudinal axis of the check valve, or the density may be asymmetrically formed with respect to the longitudinal axis of the check valve.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a compressor according to the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention.

The scroll compressor 1 is surrounded by a closed housing 2, and partitions the low-pressure chamber 6 having the suction pipe 4, the high-pressure chamber 10 having the discharge pipe 8, and the air-tight state between the low-pressure chamber 6 and the high-pressure chamber 10. Together with a discharge cover 12 fixed to the closed housing 2 and a conventionally known scroll-type compression mechanism 1 attached to the discharge cover 12.
And 4.

The scroll-type compression mechanism 14 is for compressing a gas in the low-pressure chamber 6, for example, a refrigerant gas, and discharging the compressed gas to the high-pressure chamber 10. The scroll-type compression mechanism 14 includes a fixed scroll 16 fixed to the discharge cover 12, a orbiting scroll 18 for orbiting in association with the fixed scroll 16, and a drive unit 20 for driving the orbiting scroll 18. I have.

The drive section 20 includes a shaft 22 for orbiting the orbiting scroll 18, an upper bearing 24 and a lower bearing 26 that rotatably support the shaft 22 and are fixed to the sealed housing 2, and rotate the shaft 22. And an electric motor 28 for driving the motor. The electric motor 28
It has a rotor 30 fixed to the shaft 22 and a stator 32 fixed to the sealed housing 2.

Fixed scroll 16 and orbiting scroll 1
8 has end plates 34 and 36 and spiral wraps 38 and 40 erected on the end plates 34 and 36, respectively. These spiral wraps 38, 40 are interlocked to form a plurality of closed compression chambers 42 therebetween. The orbiting scroll 18 is not rotated by a rotation preventing mechanism 44 such as an Oldham ring. These closed compression chambers 42 are provided in the orbiting scroll 18.
Is turned, the central portion 46 of the scroll-type compression mechanism 14 is rotated.
And their volumes gradually decrease. The closed compression chamber 42 communicates with the low pressure chamber 6 when it is at the peripheral portion 48 of the scroll compression mechanism 14, and discharges the fixed scroll 16 when it moves to the center 46 of the scroll compression mechanism 14. Port 50
It has come to communicate with.

The discharge cover 12 has a discharge hole 52 for discharging the gas compressed by the closed compression chamber 42 to the high-pressure chamber 10, an end opening 54 of the discharge hole 52 facing the high-pressure chamber 10, and an end opening 54. And the discharge hole 52 communicates with the discharge port 50 of the fixed scroll 16. In the seating surface 56, the discharge holes 5
A check valve 58 for closing the second end opening 54 and a check valve 5
8 and a valve presser 60 for regulating the lift amount. The check valve 58 has one end 62 fixed to the seating surface 56 by a bolt 63.

2 and 3 are a plan view and a side view of the check valve 58. FIG. The check valve 58 is formed of an elongated elastic plate,
As shown in FIGS. 2 and 3, one end 62 and another portion 64 are provided, and the other portion 64 has a closing surface 66 that closes the end opening 54 of the discharge hole 52. Also, check valve 58
Has a longitudinal axis 67. Although the thickness and density of the check valve 58 is generally uniform, the check valve 58 may have a protrusion 70 at any location on one side 68 of the longitudinal axis 67.
have.

Next, the operation of the scroll compressor 1 will be described.

The closed compression chamber 42 has a scroll-type compression mechanism 1
When the closed compression chamber 42 is located at the peripheral portion 48 of the fourth compression chamber 42, the closed compression chamber 42 communicates with the low-pressure chamber 6 and stores the refrigerant gas in the low-pressure chamber 6 in the closed compression chamber 42. When the electric motor 28 is operated to rotate the shaft 22, the orbiting scroll 18 moves to the fixed scroll 16.
Makes a revolving motion relative to. As a result, the hermetic compression chamber 42 formed between the fixed scroll 16 and the orbiting scroll 18 moves toward the central portion 46 of the scroll-type compression mechanism 14 and the volume thereof decreases. Thereby, the refrigerant gas in the closed compression chamber 42 is compressed. The closed compression chamber 42 moved to the central portion 46 of the scroll type compression mechanism 14 is connected to the discharge port 5 of the fixed scroll 16.
0 and the discharge hole 52.

When the pressure in the discharge hole 52, that is, the pressure of the compressed refrigerant gas is higher than the pressure in the high pressure chamber 10, the refrigerant gas pushes up the check valve 58 and the end opening 5
Open 4. As a result, the discharge hole 52 and the high-pressure chamber 10 communicate with each other, and the compressed refrigerant gas is discharged to the high-pressure chamber 10.
Conversely, when the pressure in the discharge hole 52 becomes lower than the pressure in the high pressure chamber 10, the check valve 58 is seated on the seating surface 56 and the closing surface 66 of the check valve 58 is The end opening 54 of 52 is closed. To close the end opening 54 of the discharge hole 52, the closing surface 66 of the check valve 58 is
Check valve 58 has a protrusion 70 on one side 68 of the longitudinal axis 67 so that the resistance and weight to gas on both sides of the longitudinal axis 67 are different, and the check valve 58 Is slightly inclined. Thereby,
The closing surface 66 of the check valve 58 also moves toward the end opening 54 with a slight inclination with respect to the end opening 54. Thus, when the closing surface 66 reaches the end opening 54, a gap is created between the closing surface 66 and the end opening 54, though the end opening 54 is substantially closed by the closing surface 66. With this gap, a sudden pressure rise in the discharge hole 52 is reduced, and the generation of a shocking pressure wave is reduced, so that the excitation of the acoustic mode in the closed compression chamber caused by the shocking pressure wave is suppressed. . Thereby, the vibration propagating to the sealed housing 2 can be reduced, and the noise radiated from the sealed housing 2 can be reduced. As a result, the noise of the compressor can be reduced. Thereafter, the closing surface 66 fully closes the end opening 54, and the inclination of the closing surface 66 is returned.

FIG. 4 is a graph showing the time change of the pressure in the closed compression chamber 42. 4 shows the pressure in the closed compression chamber 42 of the scroll compressor 1 of the present embodiment, and the broken line shows the pressure in the closed compression chamber 4 of the conventional scroll compressor 80.
2 shows the pressure inside. As shown in FIG.
8 is closed, in the scroll compressor 80 of the related art, while the pressure in the closed compression chamber 42 changes in a pulsed manner, the pressure in the closed compression chamber 42 of the scroll compressor 1 of the present embodiment is changed. Does not show a pulse-like change.

FIGS. 5 and 6 show a modified check valve 7 respectively.
0 is a plan view and a side view. As shown in FIG. 5, the planar shape of the check valve 70 is symmetric with respect to the longitudinal axis 72, but the thickness differs with respect to the longitudinal axis 72 as shown in FIG. 7 and 8 are a plan view and a side view, respectively, of a check valve 74 of another modification. As shown in FIGS. 7 and 8, the planar shape and thickness of the check valve 74 are symmetric about the longitudinal axis 76, but the density of the check valve 74 is different relative to the longitudinal axis 76. . The check valve 7 of the modified example shown in FIGS.
When the closing surface 66 of the check valve 58 moves toward the end opening 54 of the discharge hole 52, the check valves 70, 74 are used.
Because the weights on both sides of the longitudinal axes 72, 76 of
The posture of the check valves 70, 74 is slightly inclined,
The closing surface 66 of the check valve 58 moves toward the end opening 54 with a slight inclination with respect to the end opening 54. Therefore, FIG.
3 and 3, when the closing surface 66 reaches the end opening 54, the end opening 54 is substantially closed by the closing surface 66, but there is a gap between the closing surface 66 and the end opening 54. The generation of the shock pressure wave is reduced, the excitation of the acoustic mode in the sealed compression chamber 42 caused by the shock pressure wave is suppressed, and the vibration transmitted to the sealed housing 2 is reduced. As a result, noise radiated from the sealed housing 2 can be reduced.

The present invention is not limited to the above-described embodiments, and embodiments that can be easily equivalent to those skilled in the art based on the claims are within the scope of the present invention. For example, although the scroll compressor has been described in the above embodiment, the present invention can be applied to compressors of other compression formats.

[0026]

According to the compressor of the present invention, the performance as a compressor can be maintained and noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a plan view of a check valve.

FIG. 3 is a side view of the check valve of FIG. 2;

FIG. 4 is a graph showing a change in pressure in a closed pressure chamber when a check valve is closed.

FIG. 5 is a plan view of a check valve according to a modification.

FIG. 6 is a side view of the check valve of FIG. 5;

FIG. 7 is a plan view of a check valve according to a modification.

FIG. 8 is a side view of the check valve of FIG. 7;

FIG. 9 is a partial vertical sectional view of a conventional scroll compressor.

FIG. 10 is a plan view of a check valve of a conventional scroll compressor.

FIG. 11 is a partial longitudinal sectional view of a prior art scroll compressor, showing a check valve in an open position.

[Explanation of symbols]

 Reference Signs List 10 high pressure chamber 42 closed compression chamber 52 discharge hole 54 end opening 58, 70, 74 check valve 62 end 64 other part 66 closing surface 67, 72, 76 longitudinal axis 70 projection

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H003 AA01 AB01 AB06 AB07 AC02 AC03 BA00 CC06 3H029 AA02 AA11 AB03 BB21 CC15 3H058 AA15 BB13 BB34 BB35 CA06 EE09 EE13 EE17 3H071 AA06 BB01 BB02 CC21 DD13

Claims (5)

[Claims] 1. A high pressure space, a closed low pressure space,
A communication hole communicating the high-pressure space and the closed low-pressure space; an end opening of the communication hole facing the high-pressure space; and an end opening for blocking gas flow from the high-pressure space to the closed low-pressure space. A check valve having a closing surface that closes the end opening by moving toward the end opening, wherein the check valve is configured such that the closing surface moves when the closing surface moves toward the end opening. Characterized in that the compressor has a posture inclining means for inclining the body with respect to the end opening. 2. The check valve according to claim 1, wherein the check valve has an elongated plate shape, and has a fixed end portion and another portion including the closing surface, and the other portion is provided by the attitude tilting means. The compressor according to claim 1, wherein the compressor is asymmetrical with respect to a longitudinal axis of the check valve. 3. The posture inclination means has a plane shape formed asymmetrically with respect to a longitudinal axis of the check valve.
The compressor according to claim 2. 4. The compressor according to claim 2, wherein the attitude inclination means has a thickness formed asymmetrically with respect to a longitudinal axis of the check valve. 5. The compressor according to claim 2, wherein the attitude inclination means has a density formed asymmetrically with respect to a longitudinal axis of the check valve.