JPH09280185A - Valve mechanism for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability by the behavior stability of a lead valve, to reduce noise by the reduction of pulsation. SOLUTION: A partitioning plate 25a, for partitioning between a compression chamber 41 and a discharge chamber 36, has a lead valve 31; for opening a discharge hole 25c by the different pressure of a compression gas when the discharge of the compressed gas is started, and for closing the hole 25c by own spring force when the discharge is finished; and moreover, the following are provided on a partitioning plate 25b, a pressing means : for moving the lead valve 31 to the discharge chamber 36 side, and also for pressing the lead valve 31 to a fixed retainer 32 side when discharge is commenced, and a housing chamber 1: for movably housing the pressing means to the compression chamber side and the discharge chamber 36 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve mechanism of a compressor, and more particularly to a valve mechanism of a compressor that opens and closes by a gas differential pressure.

[0002]

2. Description of the Related Art Oscillating swash plate type compressors and scroll type compressors are well known as conventional compressors. Since the valve mechanism of the compressor is a mechanism common to each of the above compressors, a scroll compressor will be described here as an example of the description of the prior art.

[0003] In a scroll type compressor, a pair of spiral bodies are engaged with each other at an angle, and a relative circular motion (only a revolving motion) is given to move a closed space formed between the spirals toward the center to increase the volume. This is a positive displacement type fluid compression device that compresses and discharges a compressed fluid from a central portion.

A conventional scroll type compressor has a housing 10 as shown in FIG. Housing 10
Is composed of a front end plate 11, a rear end plate 12, and a cylindrical side wall 13 connecting the both, and communicates with the outside through a fluid suction hole (not shown) and a fluid discharge hole (not shown) formed in the rear end plate 12. Form a closed chamber.

[0005] A main shaft 17 rotatably supported via a radial needle bearing 16 is attached to the front end plate 11. A shaft seal mechanism 19 is installed around the main shaft 17 in a cylindrical body 18 that projects from the front end plate 11 to the left side of the drawing so as to surround the main shaft 17. A pulley 20 is supported on the outer periphery of the cylindrical body 18 as a bearing. The pulley 20 is coupled to the main shaft 17 so as to transmit a rotational force from an external drive source (for example, a motor or the like) to the main shaft 17 via a belt.

[0006] A thrust needle bearing 22 provided concentrically with the main shaft 17 is supported on a main shaft 17 located inside the front end plate 11 via a rotor 21. On the side of the rotor 21 opposite to the front end plate 11, there is provided a crank pin 23 projecting from the rotor 21 and eccentric from the main shaft 17.

A movable scroll member 24 and a fixed scroll member 25 meshed with the movable scroll member 24 are provided in the cylindrical side wall 13. The movable scroll member 24 has a spiral body 24b fixed to one surface of one disk 24a. The movable scroll member 24 is supported on the crankpin 23 by bearing.

The fixed scroll member 25 has a disk (partition plate) 25a and a spiral body 25b fixed to one surface of the disk 25a. The fixed scroll member 25 sandwiches a portion near the peripheral surface of the disk 25 a between the cylindrical side wall 13 of the housing 10 and the rear end plate 12 via a seal ring 42, and
Together with the rear end plate 12 and the cylindrical side wall 1
3 is firmly fixed.

In this scroll type compressor, the movable scroll member 24 performs an eccentric motion due to the eccentric motion of the crank pin 23 caused by the rotation of the main shaft 17. That is, it moves on a circular orbit whose radius is the distance between the main shaft 17 and the crank pin 23.

A discharge hole 25c is formed in the disk 25a of the fixed scroll member 25. A reed valve 31 is provided on the discharge hole 25c so as to open and close the discharge hole 25c. Further, the movement of the reed valve 31 is restricted by the fixed retainer 32. One ends of the reed valve 31 and the fixed retainer 32 are fixed to the disc 25a by valve fixing means such as bolts 33.

As shown by the arrow in FIG. 5, the reed valve 31
When the gas is discharged from the compression chamber 41 on the side of the scrolls 24b, 25b formed by the compression operation of the movable scroll member 24 to the side of the discharge chamber 36 inside the rear end plate 12 through the discharge hole 25c, the gas is discharged. It changes depending on the pressure and opens the discharge hole 25c. At this time, the discharge hole 25c
Gas from the discharge chamber 36 inside the rear end plate 12
Is discharged to Further, the reed valve 31 is configured to be cantilevered or supported at both ends by a bolt 33 so as to prevent backflow of the compressed gas from the discharge hole 25c and to be sealed.

[0012]

However, when the compressed gas is discharged, the reed valve 31 is pushed up by the differential pressure, that is, deformed in the direction away from the discharge hole 25c. However, when the gas flows out, the reed valve 31 is discharged to the discharge hole 25c. When the gas flows between the valve seat surface 25g of the disc 25b and the reed valve 31, which face each other, the gas becomes a high-speed flow, a negative pressure is generated, and the reed valve 31 continues to act in the closing direction.

Therefore, until the gas is completely discharged, the cycle in which the reed valve 31 is closed and in the direction in which the reed valve 31 is pushed up is repeated, so that extra fatigue is accumulated in the reed valve 31. There's a problem.

Until the gas is completely discharged,
When the cycle in which the reed valve 31 is closed and the cycle in which the reed valve 31 is pushed up by gas pressure are repeated, pressure pulsation occurs, which causes a problem that noise due to the pulsation occurs.

Therefore, according to the present invention, a differential pressure piston is provided which moves only by the differential pressure at the time of discharge regardless of the gas flow, and the reed valve is continuously pushed at one end of the differential pressure piston to lead by negative pressure due to the gas flow. It is an object of the present invention to provide a valve mechanism for a compressor that prevents the valve from closing.

[0016]

According to the present invention, a compression chamber having a compression means for producing a compressed gas, a discharge chamber for storing a compressed gas discharged from the compression chamber, the compression chamber and the discharge chamber are provided. It has a partition plate for partitioning between the rooms, and the partition plate is
There is a discharge hole penetrating between the compression chamber and the discharge chamber, and the discharge hole is formed on the discharge chamber side of the discharge hole by the differential pressure of the compressed gas when the discharge of the compressed gas is started. A reed valve that opens and closes by its own spring force at the end of discharge, and a fixed retainer that restricts movement of the reed valve toward the discharge chamber in the direction in which the reed valve opens due to the differential pressure between the compression chamber and the discharge chamber. The partition plate further includes a pressing unit that moves the reed valve to the discharge chamber side at the start of the discharge and presses the reed valve to the fixed retainer side to keep the discharge hole open. And a storage chamber that stores the pressing means movably toward the compression chamber side and the discharge chamber side.

Further, according to the present invention, the pressing means comprises:
A pressing part that can be retracted and retracted to the accommodation chamber side so as to press the reed valve, and a compression part that is connected to one end of the pressing part and is movably accommodated in the accommodation chamber by the differential pressure of the compressed gas. A valve mechanism for a compressor is obtained, which has a differential pressure piston portion movable to the discharge chamber side.

Further, according to the present invention, the storage chamber is
An accommodating portion accommodating the differential pressure piston portion, a first hole portion for guiding the pressing portion to the reed valve side with a diameter dimension smaller than that of the accommodating portion, and a diameter dimension of the accommodating portion A valve mechanism for a compressor is obtained, which has a small diameter dimension and a second hole that communicates between the compression chamber and the discharge chamber.

[0019]

According to the valve mechanism of the compressor of the present invention, at the start of discharge, the reed valve opens due to the differential pressure, and at the same time, the differential pressure piston also moves to the discharge chamber side and presses the reed valve at one end.
After that, the reed valve tries to close due to the negative pressure due to the gas flow, but this is regulated by the differential pressure piston. Since the differential pressure disappears at the end of discharge, no force is generated in the differential pressure piston, and the reed valve closes normally by its own spring force.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a valve mechanism for a compressor according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a vertical sectional view showing a scroll type compressor according to the present invention. FIG. 2 shows a valve mechanism of the compressor shown in FIG.

Since the structure of this scroll compressor is the same as that of the scroll compressor shown in FIGS. 4 and 5, except for the valve mechanism, the same parts are designated by the same reference numerals and their description is omitted.

With reference to FIGS. 1 and 2, the compressor has a compression chamber 41 having a compression mechanism for producing compressed gas, and a discharge chamber 36 for containing the compressed gas discharged from the compression chamber 41.
And a partition plate (corresponding to the disk of the fixed scroll member 25) 25a for partitioning the compression chamber 41 and the discharge chamber 36.

The partition plate 25a includes a compression chamber 41 and a discharge chamber 3
It has a discharge hole 25c penetrating between the six. Discharge hole 2
On the discharge chamber 36 side of 5c, the reed valve 31, which opens the discharge hole 36 by the differential pressure of the compressed gas when the discharge of the compressed gas is started, and closes by its own spring force at the end of the discharge, the compression chamber 41, and the discharge chamber. Due to the differential pressure of 36, the reed valve 31
Has a fixed retainer 32 that restricts the movement of the reed valve 31 toward the discharge chamber 36 in the opening direction.

Furthermore, the reed valve 31 is moved to the discharge chamber 36 side at the time of starting discharge on the partition plate 25a, and the reed valve 31 is pressed against the fixed retainer 32 side to assist in maintaining the open state of the discharge hole 25c. The pressing means and the accommodation chamber 1 that accommodates the pressing means so as to be movable toward the compression chamber side 41 and the discharge chamber 36 side are provided.

The pressing means is connected to one end of the pressing portion 2a, which is retractable toward the discharge chamber 36 so as to press the reed valve 31, and one end of the pressing portion 2a. It has a differential pressure piston 2b that is movable to the compression chamber 41 side and the discharge chamber 36 side by pressure.

The accommodating chamber 1 is located in the vicinity of the discharge hole 25c, and accommodates the accommodating portion 1a accommodating the differential pressure piston 2b and the pressing portion 2a having a diameter smaller than that of the accommodating portion 1a on the reed valve 31 side. First hole portion 1c for guiding to and accommodation portion 1a
With a diameter smaller than that of the compression chamber 41 and the accommodating portion 1.
It has the 2nd hole part 1d which connected between a.

At the time of discharging the compressed gas, the reed valve 31 is pushed up by the differential pressure, that is, it is deformed in the direction away from the discharge hole 25c, but when the gas flows out, the discharge hole 25c.
When the gas flows between the reed valve 31 and the valve seat surface 25g of the partition plate 25b opposed to the reed valve 31, the gas becomes a high-speed flow and negative pressure is generated, and the reed valve 31 continues to act in the closing direction.

However, at the start of discharge, the reed valve 31 is opened by the differential pressure, and at the same time, the differential pressure piston 2b is moved to the discharge chamber 36 side, and the reed valve 31 is pressed by the tip of the pressing portion 2a. After that, the reed valve 31 tries to close due to the negative pressure due to the gas flow, but this is regulated by the pressing portion 2a. Since the differential pressure disappears at the end of discharge, the force for pushing the differential pressure piston 2b toward the discharge chamber 36 side does not occur, and the reed valve 31 normally closes by its own spring force.
The free end of the reed valve 31 closes the discharge hole 25c.

FIG. 3 is a comparison of the pulsation between the reed valve of the present invention and the conventional reed valve in terms of the relationship between the crank angle (rotation angle of the crank pin 23) and the pressure. In this graph, the solid line A indicates the discharge pressure due to the valve structure of the compressor according to the present invention. A broken line B indicates the discharge pressure due to the valve structure of the conventional compressor. As described above, in the conventional valve structure of the compressor, pulsation occurs in the discharge pressure due to the behavior of the reed valve 31, but in the valve structure of the compressor of the present invention, the behavior of the reed valve 31 is Because of the stability, the pulsation of the discharge pressure is reduced.

[0030]

As described above, according to the valve mechanism of the compressor of the present invention, at the start of discharge, the reed valve opens due to the differential pressure, and at the same time, the differential pressure piston moves to the discharge chamber side, and the reed valve is It tries to close with negative pressure due to gas flow, but since this is regulated by the differential pressure piston, durability can be improved by stabilizing the behavior of the reed valve, and noise can be reduced by reducing pulsation. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a scroll type compressor having a valve mechanism of a compressor of the present invention.

FIG. 2 is a sectional view showing a valve mechanism used in the scroll compressor shown in FIG.

FIG. 3 is a graph comparing the pulsation of the reed valve of the present invention with the pulsation of the reed valve of the conventional example in terms of the relationship between crank angle and pressure.

FIG. 4 is a sectional view showing a compressor provided with a conventional valve mechanism.

5 is a cross-sectional view showing a valve mechanism of the compressor shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage chamber 1a Storage part 1c 1st hole part 1d 2nd hole part 2a Pressing part 2b Differential pressure piston 10 Housing 11 Front end plate 12 Rear end plate 13 Cylindrical side wall 16 Radial needle bearing 17 Main shaft 23 Crank pin 24 Movable scroll member 25 fixed scroll member 24a disk 24b, 25b spiral body 25a disk (partition plate) 25c discharge hole 31 reed valve 32 fixed retainer 36 discharge chamber 41 compression chamber

Claims (3)

[Claims] 1. A compression chamber having a compression means for generating compressed gas, a discharge chamber for storing compressed gas discharged from the compression chamber, and a partition plate for partitioning the compression chamber and the discharge chamber from each other. The partition plate has a discharge hole penetrating between the compression chamber and the discharge chamber, and on the discharge chamber side of the discharge hole,
A reed valve that opens the discharge hole by the differential pressure of the compressed gas when the discharge of the compressed gas is started, and closes by its own spring force at the end of the discharge, and the reed valve by the differential pressure between the compression chamber and the discharge chamber. Has a fixed retainer that restricts the movement of the reed valve toward the discharge chamber in the opening direction, and the partition plate further moves the reed valve toward the discharge chamber at the time of starting the discharge. A pressing unit that holds the valve to the fixed retainer side to keep the discharge hole open, and a storage chamber that movably stores the pressing unit to the compression chamber side and the discharge chamber side are provided. Characteristic compressor valve mechanism. 2. The compressor valve mechanism according to claim 1, wherein the pressing means is connected to one end of the pressing part and a pressing part that is retractable toward the accommodation chamber so as to press the reed valve. A valve mechanism of a compressor, comprising: a differential pressure piston portion that is movably accommodated in the accommodation chamber and is movable to the compression chamber side and the discharge chamber side by a differential pressure of the compressed gas. 3. The compressor valve mechanism according to claim 2, wherein the accommodating chamber accommodates the accommodating portion accommodating the differential pressure piston portion and the pressing portion with a diameter smaller than a diameter of the accommodating portion. It has a first hole portion that guides to the reed valve side and a second hole portion that communicates between the compression chamber and the discharge chamber with a diameter smaller than the diameter of the accommodating portion. Characteristic compressor valve mechanism.