JPH10220356A - Refrigerant compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of a discharge valve due to a foreign matter by a method wherein a foreign matter discharge part is formed in one of a valve plate provided with a discharge port to feed discharge gas from a compression chamber to a discharge chamber and a valve stopper to keep a maximum opening amount of the discharge valve, which opens and closes the discharge port, at a constant value. SOLUTION: An oscillation swash plate type compressor is formed such that when an oscillation plate is oscillated through the rotation power of an engine, suction, compression, and discharge of high pressure refrigerant gas are effected, in the order, and high pressure refrigerant gas is discharged. In this case, even when, during opening of a discharge valve 16, a foreign matter in exhaust gas enters a wedge-form space formed between a discharge valve 16 and a valve plate 2, a foreign matter falls in an annular groove 30 and lodging of the foreign matter between the valve plate 2 and the discharge valve 16 during closing is prevented from occurring. Further, even when during closing of the discharge valve 16, the foreign matter enters a wedge-form space formed between the discharge valve 16 and the valve stopper 17, the foreign matter falls in a belt-like groove 31 and lodging of the foreign matter between the valve stopper 17 and the discharge valve 16 is prevented from occurring during opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a refrigerant compressor such as a wobble plate compressor.

[0002]

2. Description of the Related Art A plurality of cylinder bores are provided in a cylinder block of a wobble plate compressor at predetermined intervals in a circumferential direction around a shaft. A rear head is fixed to a rear end surface of the cylinder block via a valve plate, and a discharge chamber and a suction chamber are formed in the rear head.

[0003] On the front end face of the cylinder block,
The front head is fixed. A crank chamber is formed in the front head, and a swing plate is housed in the crank chamber.

[0004] The valve plate is provided with a discharge port for communicating the cylinder bore with the discharge chamber and a suction port for communicating the cylinder bore with the suction chamber at predetermined circumferential intervals.

FIG. 7 is a plan view showing an assembled state of a conventional suction valve, valve plate, discharge valve and valve stopper, and FIG.
FIG. 8 is a sectional view taken along the arrow VIII-VIII in FIG. 7.

[0006] The suction port 215 is opened and closed by a suction valve 221, and the suction valve 221 is disposed between the front end face of the valve plate 202 and the rear end face of the cylinder block.

The discharge port 214 is opened and closed by a discharge valve 216, and the discharge valve 216 is fixed to a rear head side end surface of the valve plate 202 by a rivet 218 together with a valve stopper 217.

Note that there is a gap between the front end of the valve plate 202 on the front head side and the cylinder block and a gap between the rear end of the valve plate 202 on the rear head side and the rear head.
Gaskets (not shown) for maintaining airtightness are provided.

[0009]

In the swinging plate compressor, during operation, the refrigerant gas sucked into the refrigerant compressor from an evaporator (not shown) via an external pipe enters the suction chamber in the refrigerant compressor. Then, after flowing into the compression chamber in the cylinder bore through the suction port 215 and being compressed, the discharge port 2
It flows out to the discharge chamber through 14.

At this time, foreign substances such as abrasion powder inside the compressor and processing burrs generated in the manufacturing process and remaining in the components in the refrigeration cycle are mixed into the refrigerant gas and circulate together.

When the discharge valve 216 is closed, a wedge-shaped space is formed between the discharge valve 216 and the valve stopper 217 (see FIG. 8).

When the discharge valve 216 is opened, the discharge valve 216 is in close contact with the valve stopper 217, and a wedge-shaped space is formed between the valve plate 202 and the discharge valve 216.

Therefore, when the valve is closed (or when the valve is opened), foreign matter mixed in the refrigerant gas enters the wedge-shaped space and remains in the wedge-shaped space, and the discharge valve 216 is opened (or closed). At times), the remaining foreign matter may be caught.

When the foreign matter is opened (or closed), it acts as a fulcrum of the swing of the discharge valve 216.
In some cases, stress was concentrated at a position where the foreign matter was present, resulting in breakage.

The present invention has been made in view of such circumstances, and an object thereof is to provide a highly reliable refrigerant compressor that can prevent the discharge valve from being damaged by foreign matter.

[0016]

According to a first aspect of the present invention, there is provided a refrigerant compressor comprising: a valve plate having a discharge port for sending discharge gas from a compression chamber to a discharge chamber; and the discharge port. And a valve stopper fixed to the valve plate and having a valve stopper for keeping the maximum valve opening of the discharge valve constant, wherein at least one of the valve stopper and the valve plate is provided. In addition, a foreign matter discharge part for discharging foreign matter is formed.

Among the foreign substances that have entered the wedge-shaped space formed by the valve plate and the discharge valve and the valve stopper and the discharge valve, the foreign substances that have entered the one wedge-shaped space are formed on one of the valve stopper and the valve plate. The foreign matter is dropped into the discharged foreign matter discharge part, and is discharged from the foreign matter discharge part by the flow of the refrigerant gas generated in the foreign matter discharge part.

According to a second aspect of the present invention, the refrigerant compressor is provided with a valve plate having a discharge port for sending discharge gas from the compression chamber to the discharge chamber, a discharge valve for opening and closing the discharge port, and fixed to the valve plate. A refrigerant compressor having a valve stopper for keeping the maximum valve opening amount of the discharge valve constant, wherein a foreign matter discharge unit for discharging foreign matter is provided to the valve stopper and the valve plate via the discharge valve. It is characterized by being formed so as to face each other.

When foreign matter enters a wedge-shaped space formed between the valve plate and the discharge valve when the discharge valve is opened, the foreign matter does not remain in the wedge-shaped space but discharges foreign matter formed on the valve plate. And is discharged from the foreign matter discharge part by the flow of the refrigerant gas generated in the foreign matter discharge part.

Further, when the valve is closed, even if foreign matter enters a wedge-shaped space formed between the valve plate and the valve stopper, the foreign matter does not remain in the wedge-shaped space and the foreign matter formed in the valve stopper is discharged. And is discharged from the foreign matter discharge part by the flow of the refrigerant gas generated in the foreign matter discharge part.

According to a third aspect of the present invention, there is provided a refrigerant compressor.
Alternatively, in the refrigerant compressor according to 2, the foreign matter discharge portion formed in the valve plate is an arc-shaped groove.

A flow of the refrigerant gas is generated along the arc-shaped groove,
Due to the flow of the refrigerant gas, the foreign matter that has fallen into the foreign matter discharge part is discharged from the foreign matter discharge part that opens on both sides of the discharge valve.
Since the arc-shaped groove is easy to press-mold, mass production of the valve plate becomes possible.

[0023]

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

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

Cylinder block 1 of this wobble plate compressor
One end face of the rear head 3
However, front heads 4 are fixed to the other end surfaces, respectively.

In the cylinder block 1, a plurality of cylinder bores 6 are provided at regular intervals around the shaft 5 in the circumferential direction.
Are arranged. A piston 7 is slidably accommodated in each of the cylinder bores 6.

A crank chamber 8 is formed in the front head 4. In the crank chamber 8, an oscillating plate 10 oscillating about a hinge ball 9 in association with rotation of the shaft 5.
Is housed.

The oscillating plate 10 is mounted on the boss portion of the drive hub 41 so as to be relatively rotatable. The drive hub 41 is connected to a thrust flange 40 fixed to the shaft 5 via a link mechanism, and is connected to the shaft 5. It is connected to the shaft 5 via a hinge ball 9 mounted movably in the axial direction.

The oscillating plate 10 is connected to the piston 7 via a connecting rod 11, and the oscillating plate 10 causes the piston 7 to reciprocate in the cylinder bore 6.
The tilt angle of the swing plate 10 changes according to the pressure in the crank chamber 8.

In the rear head 3, a discharge chamber 12 is provided.
A suction chamber 13 located around the discharge chamber 12 is formed.

The valve plate 2 has a discharge port 14 for connecting the cylinder bore 6 to the discharge chamber 12 and a suction port 15 for connecting the cylinder bore 6 to the suction chamber 13.
Each is provided only for the number of cylinders.

The discharge port 14 is opened and closed by a discharge valve 16, and the discharge valve 16 is fixed to an end face on the rear head side of the valve plate 2 by a rivet 18 together with a valve stopper 17. The valve stopper 17 keeps the maximum opening amount of the discharge valve 16 constant.

The suction port 15 is opened and closed by a suction valve 21, and the suction valve 21 is fixed to a front end surface of the valve plate 2 by a rivet 18.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG.
FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is a sectional view taken along line V-V of FIG.

An annular groove (foreign matter discharge portion) 30 is formed in the rear head side end surface of the valve plate 2. The annular groove 30 is located between the discharge port 14 and the rivet 18 as shown in FIGS.

The discharge valve 16 includes a fixed portion 16A through which the rivet 18 is inserted, and five movable portions 16B extending radially outward from the fixed portion 16A and covering the discharge port 14.

The valve stopper 17 has the same shape as the discharge valve 16 and includes a fixed portion 17A and five movable portions 17B extending radially outward from the fixed portion 17A.

Valve stopper 17 facing discharge valve 16
The movable part 17 is located at a position facing the annular groove 31 on the front surface of the
A band-shaped groove (foreign matter discharge portion) 31 is formed in the width direction of B.

Next, the operation of the wobble plate compressor will be described.

When the rotational power of the engine (not shown) is transmitted to the shaft 5, the shaft 5
And the drive hub 41, the swing plate 10 swings with the rotation, and the swing causes the piston 7 to reciprocate in the cylinder bore 6. As a result, the volume in the cylinder bore 6 changes. The suction, compression, and discharge of the refrigerant gas are sequentially performed by the change, and the high-pressure refrigerant gas having a capacity corresponding to the inclination angle of the oscillating plate 10 is discharged.

The discharge valve 16 is opposed to the spring force of the movable portion 16B.
When the valve is lifted up by the refrigerant gas and the foreign matter in the refrigerant gas enters the wedge-shaped space formed by the discharge valve 16 and the valve plate 2 when the valve is opened by the refrigerant gas, the foreign matter falls into the annular groove 30 and the valve is closed. Sometimes valve plate 2 and discharge valve 1
6 is not bitten.

Foreign matter falling into the annular groove 30 is
The air flows around the movable portion 16B due to the flow of the refrigerant gas generated along with the refrigerant gas, and is discharged from the annular groove 30 together with the refrigerant gas.

When the discharge valve 16 is seated on the valve plate 2 due to the spring force of the movable portion 16B, foreign matters in the refrigerant gas enter the wedge-shaped space formed by the discharge valve 16 and the valve stopper 17. Even in the case, foreign matter is
1, so that it does not get caught between the valve stopper 17 and the discharge valve 16 when the valve is opened.

The foreign matter falling into the strip groove 31 is
Due to the flow of the refrigerant gas generated along the flow path, the air flows around both sides of the movable portion 17B, and is discharged from the belt-shaped groove 31 together with the refrigerant gas.

According to the first embodiment, during operation, foreign matter may remain in the wedge-shaped spaces formed between the valve plate 2 and the discharge valve 16 and between the valve stopper 17 and the discharge valve 16. As a result, the discharge valve 16 is prevented from being damaged due to foreign matter being caught between the valve plate 2 and the discharge valve 16 and between the valve stopper 17 and the discharge valve 16.

FIG. 6 is a plan view of a valve plate for explaining a modification of the wobble plate compressor according to one embodiment of the present invention.

In this modification, instead of forming the annular groove 30 in the valve plate 2 as a foreign matter discharge portion, the annular groove 30 is formed by dividing into a plurality of arc-shaped grooves 32. The circumferential length of each of the arc-shaped grooves 32 is made larger than the width of the movable portion 16B. When the discharge valve 16 and the valve stopper 17 are fixed to the valve plate 2, both ends of the arc-shaped groove 32 are movable. , 17B.

According to this modification, the foreign matter which has fallen into the arc-shaped groove 32 due to the flow of the refrigerant gas generated along the arc-shaped groove 32 is discharged from the arc-shaped groove 32 opened on both sides of the discharge valve 16. Therefore, similarly to the above-described embodiment, it is possible to prevent the discharge valve 16 from being damaged due to foreign matter being caught.

Further, since the arc-shaped groove 32 is easier to press-mold than the annular groove 30, the valve plate 2 can be mass-produced, and the refrigerant compressor can be provided at low cost.

It should be noted that the discharge port 14 can be moved from the annular groove 30 or the arc-shaped groove 32 formed on the valve plate 2
, A discharge refrigerant gas introduction groove (not shown) can be formed to quickly guide the discharge refrigerant gas in the middle of valve opening to the annular groove 30 or the arc-shaped groove 32, thereby increasing the foreign matter discharge action.

The movable portion 17B of the valve stopper 17
If an eaves (not shown) for introducing the refrigerant gas into the belt-like groove 31 for discharging foreign matter is formed, a forced flow of the refrigerant gas occurs in the belt-like groove 31, so that the foreign matter in the belt-like groove 31 can be surely removed. Can be discharged.

Instead of forming this eave, the discharge valve 1
A hole or notch may be formed in 6 to cause a forced flow of the refrigerant gas in the strip-shaped groove 31, and the same effect as the above configuration can be obtained.

Further, the present invention can be applied to a swash plate type refrigerant compressor.

[0054]

As described above, according to the refrigerant compressor of the first aspect of the present invention, the foreign matter which has entered the wedge-shaped space formed by the valve plate and the discharge valve and the valve stopper and the discharge valve is determined. The foreign matter that has entered the one wedge-shaped space falls into the foreign matter discharge portion formed on one of the valve stopper and the valve plate, and is discharged from the foreign matter discharge portion by the flow of the refrigerant gas generated in the foreign matter discharge portion. In addition, the refrigerant compressor can reduce the damage of the discharge valve due to the foreign matter being caught, thereby improving the reliability.

According to the refrigerant compressor of the second aspect of the present invention, foreign matter that has entered the wedge-shaped space formed by the valve plate and the discharge valve and the valve stopper and the discharge valve is transferred to each of the valve stopper and the valve plate. Since the refrigerant drops into the formed foreign matter discharge part and is discharged from each foreign matter discharge part by the flow of the refrigerant gas generated in the foreign matter discharge part, the refrigerant compressor can prevent the discharge valve from being damaged due to foreign matter being caught. The reliability is improved more than the refrigerant compressor according to the first aspect.

According to the refrigerant compressor of the third aspect of the present invention, the foreign matter discharged to the foreign matter discharge part by the flow of the refrigerant gas generated along the arc-shaped groove is opened to both sides of the discharge valve. Is discharged from Since mass production of valve plates is possible, a refrigerant compressor can be provided at low cost.

[Brief description of the drawings]

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

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a view taken in the direction of arrows VV in FIG. 3;

FIG. 6 is a plan view of a valve plate for explaining a modified example of the wobble plate compressor according to one embodiment of the present invention.

FIG. 7 is a plan view showing an assembled state of a conventional suction valve, valve plate, discharge valve, and valve stopper.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 cylinder block 2 valve plate 3 cylinder head 6 cylinder bore 12 discharge chamber 13 suction chamber 14 discharge port 15 suction port 16 discharge valve 17 valve stopper 30, 31, 32 groove (foreign matter discharge portion)

Claims (3)

[Claims] 1. A valve plate having a discharge port for sending discharge gas from a compression chamber to a discharge chamber, a discharge valve for opening and closing the discharge port, and a maximum valve opening of the discharge valve fixed to the valve plate. A refrigerant stopper provided with a valve stopper for keeping the pressure constant, wherein at least one of the valve stopper and the valve plate is provided with a foreign matter discharge portion for discharging foreign matter. . 2. A valve plate having a discharge port for sending discharge gas from a compression chamber to a discharge chamber, a discharge valve for opening and closing the discharge port, and a maximum valve opening of the discharge valve fixed to the valve plate. A refrigerant stopper provided with a valve stopper for keeping the pressure constant, wherein a foreign matter discharge portion for discharging foreign matter is formed to face each of the valve stopper and the valve plate via the discharge valve. A refrigerant compressor characterized by the above-mentioned. 3. The refrigerant compressor according to claim 1, wherein the foreign matter discharge portion formed in the valve plate is an arc-shaped groove.