JPH08193584A - Rotary type compressor - Google Patents

Abstract

PURPOSE: To eliminate use of a discharge valve without impairing the easiness in assembling works, reduce the loss in opening/closing of a discharge port, enhance the so-called COP, and lower the noise. CONSTITUTION: A disc for discharge 10 is interposed between the end face of a roller 9 and the inner surface of a cylinder chamber 14 of a main bearing tool where a discharge port 18 is furnished, and a rotary type compressor concerned is equipped with this disc 10 fitted on the eccentrical part of a rotary shaft 3 and rotating in the cylinder chamber 14 in a single piece with the rotary shaft 3 and a discharge guide hole 25 provided in the disc 10 and having communication with the discharge port 18 at a prescribed rotational angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a discharge port structure for discharging a high pressure gas from a cylinder chamber in a rotary compressor.

[0002]

2. Description of the Related Art A rotary compressor used in a refrigeration cycle apparatus, such as an air conditioner or a refrigerator, is conventionally composed of a compression mechanism section as shown in FIG. In the figure, a is a rotary shaft, and an electric motor part (not shown) is provided on the upper part thereof. An eccentric part b is integrally provided on the rotary shaft a, and a roller c is fitted therein. Laura c
Is eccentrically rotated in a cylinder chamber g formed by a cylinder d and main and auxiliary bearing members e and f.

The tip of a blade (not shown) elastically abuts on the peripheral surface of the roller c to divide the interior of the cylinder chamber g. A suction pipe h is connected to the cylinder d, and a suction port i communicates with the cylinder chamber.

The main bearing e is provided with a discharge port j and communicates with the inside of the cylinder chamber g. A valve bearing k and a discharge valve m are provided on the main bearing e facing the upper surface of the discharge port j so as to be openable and closable. These bearings k
The main bearing e is provided with a valve cover n so as to surround the discharge valve m and communicate with the inside of a sealed case (not shown) through the guide hole p.

With the rotation of the rotary shaft a, however, the compressed gas is sucked into the cylinder chamber g from the suction pipe h through the suction port i. In the cylinder chamber g, the roller c is eccentrically rotated together with the eccentric part b of the rotary shaft a, and the blade tip end is slidably contacted with the roller peripheral surface to divide the cylinder chamber.

The gas sucked into the cylinder chamber g is gradually compressed as the volume of the divided cylinder chamber is reduced, and finally becomes high pressure. When the pressure rises to a predetermined pressure, the divided cylinder chamber communicates with the discharge port j, and the discharge valve m that closes the cylinder port opens. The high-pressure gas is discharged from the cylinder chamber g through the discharge port j into the valve cover n, and is further led out from the guide hole p into the closed case.

[0007]

The rotary compressor which operates in this manner has the main drawback that the high pressure gas compressed in the cylinder chamber g pushes up the discharge valve m by this pressure and discharge port m. Since it is discharged from j, the stability of the opening / closing operation of the discharge valve m is likely to be impaired.

That is, since the discharge valve m is required, the volumetric efficiency of the compressor is low, and there is a loss of operation of the discharge valve, which adversely affects the so-called COP (coefficient of performance). Then, when the discharge valve m is opened / closed, an opening / closing noise is generated, which causes a driving noise.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to eliminate the need for a discharge valve without impairing the assemblability, thereby improving the so-called COP and reducing noise. It is intended to provide a rotary compressor.

[0010]

In order to satisfy the above-mentioned object, the rotary compressor of the present invention is characterized in that a roller is fitted to an eccentric portion of a rotary shaft, and the roller is composed of a cylinder and a bearing tool. While eccentrically rotating in the formed cylinder chamber, the blade end is elastically abutted against the roller peripheral surface to divide the cylinder chamber, and the compressed gas sucked into the cylinder chamber from the suction port provided in the cylinder is compressed. In the rotary compressor that discharges from the discharge port provided in the bearing tool, the rotary compressor is interposed between the roller end surface and the cylinder chamber inner surface of the bearing tool provided with the discharge port, and is fitted to the rotary shaft. A discharge disc that rotates in the cylinder chamber integrally with the rotation shaft, and a discharge guide hole that is provided on the discharge disc and communicates with the discharge port at a predetermined rotation angle. Characterized in that Bei was.

A second aspect of the present invention is characterized in that the discharge disk according to the first aspect is fitted to an eccentric portion of the rotary shaft and is in close contact with a roller. A third aspect of the present invention is characterized in that the diameter dimension of the discharge port according to the first aspect is set larger than the diameter dimension of the discharge guide hole.

According to a fourth aspect, the diameter dimension of the discharge guide hole according to the first aspect is set to be smaller than the width dimension of the blade. A fifth aspect of the present invention is characterized in that a plurality of the discharge guide holes are provided.

[0013]

The discharge disc is interposed between the roller end surface and the cylinder chamber inner surface of the bearing member provided with the discharge port, and rotates in the cylinder chamber together with the rotary shaft. A discharge guide hole provided in the discharge disk communicates with the discharge port at a predetermined rotation angle to guide the high pressure gas from the cylinder chamber.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings as a rotary compressor provided in, for example, a refrigeration cycle apparatus. In FIG. 1, reference numeral 1 is a closed case. This is a cylindrical body 1 with open upper and lower ends.
Lids 1b and 1c are fitted to the open ends of the upper and lower sides of a, respectively, and are completely sealed by welding.

An electric compressor body 2 is housed in the closed case 1. The electric compressor body 2 is configured by connecting a motor shaft 4 on the upper side of a rotating shaft 3 oriented in the vertical direction and a compression mechanism part 5 on the lower side.

An oil reservoir 6 for containing lubricating oil is formed on the inner bottom of the closed case 1, and a part of the compression mechanism 5 is immersed therein. The electric motor portion 4 is arranged with a stator 7 fixed to the inner wall of the cylindrical body portion 1a of the hermetically sealed case 1 and an inner peripheral surface of the stator with a small gap, and is fitted to the rotary shaft 3. And a rotor 8 to be worn.

An eccentric portion 3a is integrally provided at a portion of the compression mechanism portion 5 of the rotary shaft 3, and a roller 9 and a discharge disc 10 described later are fitted around the eccentric portion. Further, the eccentric portion 3a, the roller 9 and the ejection disc 10
Are housed in a cylinder 11 that is fitted into the closed case 1. A main bearing tool 12 is provided on the upper surface of the cylinder 11, and a sub-bearing tool 13 is provided on the lower surface. The upper end opening of the cylinder is the main bearing tool 12 and the lower opening is the sub-bearing tool 13. Closed.

The inner peripheral surface of the cylinder 11 and the main bearing member 12
The space surrounded by the sub bearing 13 is called a cylinder chamber 14. In the cylinder chamber 14, the roller 9 and the eccentric portion 3a are eccentrically rotatable, and the ejection disc 10 is rotatably accommodated.

In particular, as shown only in FIG. 2, a blade 15 is attached to the cylinder 11 while being elastically pressed and urged, and the tip end of the blade 15 is elastically attached only to the peripheral surface of the roller 9. Abut. Therefore, this blade 1
The inside of the cylinder chamber 14 is divided by 5.

As shown in FIG. 1 again, the cylinder 11
A suction port 16 is provided so as to penetrate from the inner peripheral surface to the outer peripheral surface of the container, and a suction pipe 17 communicating with an evaporator which is an external refrigeration cycle device is connected to the suction port 17 through the sealed case 1.

On the other hand, the main bearing 12 has a discharge port 1
8 is provided and communicates with the inside of the cylinder chamber 14. The main bearing 12 is provided with a valve cover 19 so as to surround the discharge port 18. A guide hole 20 is opened in the valve cover 19 and communicates with the inside of the closed case 1.

An oil supply mechanism 21 is provided at the lower end of the rotary shaft 3, and the oil sump portion 6 is provided as the rotary shaft rotates.
Sucking up the lubricating oil of the main shaft, the main bearing member 12, the auxiliary bearing member 13, and the roller 9 through the oil supply passage 22 provided on the rotating shaft.
The sliding parts are lubricated.

Further, a discharge pipe 23 which communicates with a condenser which is an external refrigeration cycle device is connected to the upper end of the closed case 1. Next, the discharge disc 10 will be described in detail.

As shown in FIG. 3A, the discharge disc 10 is provided.
A mounting opening 10a is provided at the eccentric position, and is fitted into the eccentric portion 3a of the rotary shaft 3 by press fitting. That is, the discharge disc 10 includes the upper end surface of the roller 9 and the main bearing member 12.
Since it is interposed between the inner surface of the cylinder chamber 14 and closely contacts the upper end surface of the roller 9 and is rotationally driven in the cylinder chamber integrally with the rotary shaft 3, the inner surface of the main bearing 12 is closely slidably contacted. Prevents gas leakage from the sliding surface.

A plurality of (four in this case) discharge guide holes 25 having a small diameter are provided at predetermined positions of the discharge disk 10.
The diameter dimension φd1 of each discharge guide hole 25 is set smaller than the diameter dimension φd2 of the discharge port 18.

Further, the diameter dimension φd of each discharge guide hole 25.
1 is set to be smaller than the width dimension s1 of the blade 15. Each discharge guide hole 25 is provided at a position communicating with the discharge port 18 at a predetermined rotation angle of the discharge disk 10.

In the rotary compressor constructed as described above, the rotating shaft 3 is driven to rotate by energizing the electric motor portion 4, and the eccentric portion 3a and the roller 9 which are integrally provided in the rotating shaft 3 are formed in the cylinder chamber 14. The discharge disk 10 rotates while being eccentrically rotated.

With this rotation, low-pressure refrigerant gas is sucked from the suction pipe 17 into the cylinder chamber 14 through the suction port 16. As shown in the uppermost diagram on the left side in FIG. 2, in a state where the rolling contact position of the inner peripheral surface of the cylinder 9 of the roller 9 and the contact position of the roller 15 of the blade 15 substantially coincide with each other,
The space capacity of the cylinder chamber 14 is maximized. The refrigerant gas is introduced from the suction port 16 into the entire cylinder chamber 14 and is filled therewith.

In this state, the discharge port 18 provided on the main bearing 12 and the discharge guide hole 2 provided on the discharge disk 10 are provided.
The positions of 5 ... Are different from each other. Discharge port 1
8 is a disc 10 for discharge, an upper end surface of the roller 9 or an eccentric portion 3
a The upper end face is closed, and the discharge guide hole 25 is closed by the main bearing member 12.

The roller 9 will be described below with reference to the arrow.
With the eccentric rotation of the cylinder chamber 1, the rolling contact position of the roller 9 with the inner peripheral surface of the cylinder chamber 14 moves, and the cylinder chamber 1 from the rolling contact position to the roller contact position of the blade 15 in the rotation direction side.
4 Volume reduced. That is, the gas previously introduced into the cylinder chamber 14 is gradually compressed.

Then, the discharge disk 10 together with the roller 9 is formed.
Is rotated, and the discharge guide hole 2 provided in this discharge disc
The position of 5 ... Moves. The rotating shaft 3 is continuously rotated,
When the capacity of the cylinder chamber 14 is further reduced and the gas introduced therein is compressed and rises to a predetermined pressure, the positions of the discharge guide holes 25 ... Align with the position of the discharge port 18 and communicate with each other.

Strictly speaking, since a plurality of discharge guide holes 25 ... Are provided, they individually communicate with the discharge port 18. The discharge port 18 is opened and the high pressure gas in the cylinder chamber 14 is discharged into the valve cover 19.

As described above, the discharge port 18
The diameter dimension φd2 of the discharge guide hole 25
Since it is set to be larger than d1, the discharge port 18 and the discharge guide hole 25 can be communicated with each other for a long time, and overcompression of the refrigerant gas can be prevented.

Then, the diameter dimension φ of the discharge guide hole 25.
Since d1 is set to be smaller than the width dimension s1 of the blade 15, the discharge guide holes 25 do not straddle the blade 15 and communicate with the cylinder chambers 14 on both sides at the same time. Therefore, gas leakage from the high pressure side to the low pressure side of the divided cylinder chamber 14 is prevented.

Then, the diameter dimension φd1 of each discharge guide hole 25 is inevitably small and the flow path resistance is large as it is, but the flow path resistance can be lowered by providing a plurality of these guide holes.

The high-pressure gas whose pulsation is reduced and pressure is equalized in the valve cover 19 is introduced into the closed case 1 and filled therein, and is discharged from the discharge pipe 23 above the case. When the rotation shaft 3 and the discharge disk 10 continue to rotate and each discharge guide hole 25 passes the position of the discharge port 18, the discharge port 18 is again caused by the discharge disk 10, the roller 9 or the upper end surface of the eccentric portion 3a. The discharge guide hole 25 is closed by the main bearing member 12.

Eventually, the opening / closing operation for the discharge port 18 will be quiet, and no noise will be generated. The conventional discharge valve is no longer necessary, and the discharge start timing can be set by setting the rotation angle of the rotary shaft 3, and high volume efficiency can be obtained.

Further, since the discharge disc 10 can be assembled only by fitting it to the eccentric portion 3a of the rotary shaft 3 together with the roller 9, the assembling property is good. In the above-described embodiment, the circular ejection guide hole 25 is provided in the ejection disc 14, but the present invention is not limited to this, and FIG.
As shown in FIG. 5, the discharge guide hole 25A may have a long hole shape.

Also in this case, the diameter dimension φd2 of the discharge port 18 must be set larger than the width dimension s2 and the length dimension 12 of the discharge guide hole 25A, and therefore the discharge port 18 and the discharge guide hole 25A. Can communicate with each other for a long time and prevent overcompression of the refrigerant gas.

The width dimension s of the discharge guide hole 25A is
Since 2 is set to be narrower than the width s1 of the blade 15, each discharge guide hole does not straddle the blade, and therefore, gas leakage from the high pressure side to the low pressure side of the divided cylinder chamber 14 is prevented. Then, each discharge guide hole 25
The flow path resistance can be reduced by providing a plurality of A.

[0041]

As described above, according to the present invention, the discharge disk is interposed between the roller end surface and the cylinder chamber inner surface of the bearing member provided with the discharge port and is fitted to the rotary shaft. This discharge disc is provided with a discharge guide hole communicating with the discharge port at a predetermined rotation angle.

Therefore, since it is only necessary to fit the discharge disc on the rotary shaft, the assembly can be easily carried out. By eliminating the conventional discharge valve, the loss of the opening / closing operation of the discharge port can be reduced, and so-called COP can be improved. Furthermore, the opening and closing noise associated with the opening and closing of the discharge port can be eliminated to achieve low noise, and quiet operation can be achieved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary compressor showing an embodiment of the present invention.

FIG. 2 is a view for sequentially explaining a compression process of the embodiment.

FIG. 3A is a plan view of a discharge disk of the same embodiment.
FIG. 6B is a plan view of a discharge disk according to another embodiment.

FIG. 4 is a vertical cross-sectional view of a main part of a rotary compressor of a conventional example.

[Explanation of symbols]

3 ... Rotating shaft, 3a ... Eccentric part, 9 ... Roller, 12 ... Main bearing, 14 ... Cylinder chamber, 15 ... Blade, 16 ... Suction port, 18 ... Discharge port, 10 ... Discharge disk, 25 ...
Discharge guide hole.

Claims (5)

[Claims] 1. A roller is fitted to an eccentric portion of a rotary shaft, the roller is eccentrically rotated in a cylinder chamber formed by a cylinder and a bearing tool, and a blade end portion is elastically abutted against a roller peripheral surface. In the rotary compressor that divides the cylinder chamber with each other and compresses the compressed gas sucked into the cylinder chamber from the suction port provided in the cylinder and discharges it from the discharge port provided in the bearing, A disc for discharge which is interposed between the inner surface of the cylinder and a surface of the bearing in which the port is provided and which is fitted to the rotary shaft to rotate integrally with the rotary shaft in the cylinder chamber; A rotary compressor having a discharge guide hole communicating with the discharge port at a predetermined rotation angle. 2. The rotary compressor according to claim 1, wherein the discharge disc is fitted in the eccentric portion of the rotary shaft and is in close contact with the roller. 3. The rotary compressor according to claim 1, wherein the diameter size φd2 of the discharge port is set larger than the diameter size φd1 of the discharge guide hole. 4. The rotary compressor according to claim 1, wherein a diameter dimension φd1 of the discharge guide hole is set smaller than a width dimension s1 of the blade. 5. The rotary compressor according to claim 4, wherein a plurality of the discharge guide holes are provided.