JPH0650276A - Rotary compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] The injection passage 5 for cooling the cylinder 31 is provided while the sealing property between the facing surfaces of the cylinder 31 of the compression element 3 and the head 32 or 33 provided with the injection port 53 and the like is improved. It can be easily formed. An insertion port 51 for an injection tube 6 is formed in a cylinder 31 of a compression element 3, and an injection port 53 that opens into a cylinder chamber 30 is formed on one surface of the front and rear heads 32, 33 facing the cylinder 31. A communication hole 54 that communicates with the cylinder side passage 52 that is continuous with the insertion port 51 is provided, and a recess 55 that opens the communication hole 54 and the injection port 53 is provided on the surface of the heads 32 and 33 that is opposite to the cylinder 31. The recess 55 is sealed with a sealing plug 57 so that the communication hole 54 and the injection port 53 can communicate with each other to form the injection passage 5.

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 for a refrigerating machine or the like.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 3, a rotary compressor has a hermetic casing A having a compression element B which is rotationally driven by a motor.
Includes a cylinder B1, front and rear heads B2 and B3 that are provided opposite to each other at upper and lower portions of the cylinder B1, and a roller B4 that is rotatably arranged in a cylinder chamber B0 of the cylinder B1. Is eccentrically rotated by the eccentric shaft portion C1 of the drive shaft C extending from the motor, so that the gas refrigerant sucked into the cylinder chamber B0 is compressed.

Further, in the cylinder B1 of the compression element B,
A horizontal hole D1 that extends radially inward from the outer peripheral wall surface of the cylinder B1 and a vertical hole D2 that is provided in the radial direction inward side of the cylinder B1 in a vertical direction and communicates with the horizontal hole D1. The upper head side of the vertical hole D2 is closed by the front head B2, while the rear head B3 has a communication hole D3 facing the lower side of the vertical hole D2 and an opening in the cylinder chamber B0 of the cylinder B1. And a lateral hole D5 that extends radially inward from the outer peripheral wall surface of the rear head B3 and that communicates the communication hole D3 and the injection port D4 with each other. Then, the sealing plug D6 is press-fitted into the opening on the outer peripheral surface side of the lateral hole D5 to close the lateral hole D1 and the vertical hole D2 provided in the cylinder B1, and the rear head B3. Forming the injection passageway D between vignetting was a communicating hole D3 injection port D4 and lateral hole D5.

Then, the injection port D4
When the roller B4 rotates in the cylinder chamber B0, the roller B4 is opened and closed by the end surface of the roller B4. When the internal pressure of the cylinder chamber B0 reaches about the intermediate pressure, the injection port D4 is opened. And then
The liquid refrigerant is injected from the injection tube E connected to the lateral hole D1 of the cylinder B1 into the injection passage D.
After that, the cylinder B1 is cooled by injecting it into the cylinder chamber B0 to prevent the temperature from rising during operation.

By the way, the above-mentioned means for forming the injection passage D has the following problems. That is, the thickness of the rear head B3 is usually thin, and the lateral hole D5 provided in the rear head B3 is the communication hole D3.
Since the injection hole D4 and the injection port D4 have to be formed relatively deeply, it is very difficult to process the lateral hole D5, and the sealing plug D6 is press-fitted into the lateral hole D5. The press-fitting stress that expands the lateral hole D5 acts in the axial direction of the rear head B3, and the surface (face surface) of the rear head B3 facing the cylinder B1 is distorted. This causes the problem that the sealability between the rear head B3 and the cylinder B1 is impaired by the gap d.

Therefore, in the past, in order to solve the above problems, for example, as disclosed in Japanese Utility Model Publication No. 61-18236, and as shown in FIG.
1, in the same manner as described above, the horizontal hole D1 and the vertical hole D2.
And a through hole D7 communicating with the vertical hole D2 is axially formed in the rear head B3, and the injection port D4 is provided in the rear head B3.
In the middle portion in the thickness direction of No. 3, the injection port D4 and the through hole D7 extend radially inward from the outer peripheral wall surface thereof.
While forming the lateral hole D5 that communicates with the above, a bottomed cylindrical shape with an open top is provided, and a sealing plug F having an opening F1 is provided in a part of the cylindrical wall, and this sealing plug F is The upper opening side faces the vertical hole D2, and the opening F
1 is press-fitted from the side opposite to the cylinder facing surface of the through hole D7 so that 1 is opened to the injection port D4 side of the lateral hole D5, so that the opening side of the lateral hole D5 is opened by the cylindrical wall of the sealing plug F. The bottom of the sealing plug F is closed, and the lower side of the through hole D7 is closed, so that the liquid refrigerant supplied from the horizontal hole D1 and the vertical hole D2 is discharged from the upper opening of the sealing plug F. From the injection port D4 through the opening F1 and a part of the lateral hole D5 to the cylinder chamber B0.
I try to inject it inside.

[0007]

However, according to the means for forming the injection passage D as described above, the lateral hole D5 of the rear head B3 is provided at the portion of the rear head B3 facing the vertical hole D2 provided in the cylinder B1. A through hole D7 extending in the axial direction is formed so as to intersect with, and the sealing plug F is press-fitted from the side of the through hole D7 opposite to the cylinder facing side, so that the face of the rear head B3 as shown in FIG. Although it is possible to improve the sealing performance between the rear head B3 and the cylinder B1 by eliminating the deformation of the surface, the structure shown in FIG. 4 is such that the through hole is formed when the injection passage D is formed. In order to close D7, it is necessary to use a special sealing plug F having a bottomed cylindrical shape with an opened upper part and having an opening F1 in a part of the cylindrical wall. Plug F can not be a large diameter too in order to correspond to the through hole D7 that said seal sealing plug F is press-fitted to the diameter of the vertical hole D2, it is necessary to form a small diameter,
Moreover, the opening F1 having a smaller diameter is formed in the sealing plug F.
Since it is also necessary to open the above, there is a problem that the manufacturing process of the sealing plug F becomes very difficult. Moreover, in the publication of FIG. 4 in which a conventional example is described, a cylindrical sealing plug having an inclined surface on the upper side is used instead of the bottomed cylindrical sealing plug F, and the inclination of the sealing plug is increased. The surface is press-fitted into the through hole D7 so that the surface faces the side opposite to the injection port D4 of the lateral hole D5, and the vertical hole D is formed by the inclined surface of the sealing plug.
It is also disclosed that the liquid refrigerant supplied from 2 is guided to the side of the lateral hole D5 facing the injection port D4. However, even when the above sealing plug is used, this sealing plug is used. It is necessary to form a small diameter that can correspond to the through hole D7, and when the sealing plug is press-fitted into the through hole D7, the inclined surface thereof has the lateral hole D7.
Since it is necessary to press-fit it accurately so as to be directed to the side opposite to the injection port D4 of No. 5, there is a problem that the assembling work is required to have high accuracy and workability is deteriorated.

The present invention has been made in view of the above problems, and an object of the present invention is to maintain the sealability between the opposing surfaces of the cylinder and the head of the compression element without hindering them, while maintaining the above-mentioned characteristics. An object of the present invention is to provide a rotary compressor that can easily form an injection passage in a compression element.

[0009]

To achieve the above object, according to the present invention, a hermetic casing 1 is internally provided with a compression element 3 including a motor 2, a cylinder 31, a front head 32, and a rear head 33. In the rotary compressor provided with the injection passage 5, the insertion port 51 of the injection tube 6 is formed in the cylinder 31, and the front head 32 and the rear head 3 are formed.
3, the injection port 53 opening to the cylinder chamber 30 of the cylinder 31 and the cylinder side passage 52 in the injection passage 5 continuous with the insertion port 51 of the cylinder 31 on the surface facing the cylinder 31.
To the cylinder 31 of the head 32 or 33 which forms the communication hole 54 and the injection port 53.
4 and the injection port 53, the concave portion 55 opening
Then, the recess 55 is sealed by a sealing plug 57 so that the communication hole 54 and the injection port 53 can communicate with each other.

[0010]

In the rotary compressor described above, the recess 55 is formed so that the communication hole 54 and the injection port 53 are open, and the recess 55 has a sealing plug that allows the communication hole 54 and the injection port 53 to communicate with each other. The injection port 53 and the cylinder side passage 52 in the injection passage 5 can be made to communicate with each other only by attaching 57 by a press-fitting means or the like, and the liquid refrigerant flowing from the injection tube 6 is injected from the injection passage 5 into the injection passage 5. Port 5
It is possible to inject into the inside of the cylinder chamber 30 via 3, so that when the sealing plug 57 is attached to the concave portion 55, even if the concave portion 55 may be distorted and deformed by press-fit stress, the concave portion 55 is Head 32 or 3
3 is formed in the axial direction from the surface opposite to the cylinder 31 opposite to the cylinder 31, strain deformation due to press-fit stress occurs in the radial direction in the head 32 or 33, and the face surface of the head 32 or 33 is strained. Can be almost eliminated, and therefore, the sealability between the cylinder 31 and the head 32 or 33 can be excellently maintained. Further, since the recess 55 is formed on the surface of the head 32 or 33 opposite to the cylinder 31 so that the injection port 53 and the communication hole 54 can be opened, the recess 55 is formed to have a relatively large diameter. Since it is possible,
5 can be easily drilled and the recess 5
Since the injection port 53 and the communication hole 54 are continuously formed in the same direction as the depth direction of 5, the drilling process of the injection port 53 and the communication hole 54 can be easily performed, and the recess 55 is formed. The sealing plug 57 for sealing can be formed in a simple shape, and the work of attaching the sealing plug 57 to the recess 55 by a press-fitting means or the like can be simplified.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the rotary compressor shown in FIG. 1, a motor 2 is arranged in an upper inner part of a hermetic casing 1, and a compression element 3 is arranged in a lower side of the motor 2. Is driven to rotate by a drive shaft 4 extending from the motor 2.

The compression element 3 includes a cylinder 31 having a cylinder chamber 30, front and rear heads 32 and 33 which are provided at upper and lower portions of the cylinder 31, and rollers rotatably mounted in the cylinder chamber 30. 34 and
The drive shaft 4 is attached to a bearing portion provided on each of the heads 32 and 33.
The lower side of the bearing is supported by a bearing, and the eccentric shaft portion 41 of the drive shaft 4 is inserted into the roller 34 so that the roller 34 is eccentrically rotated in the cylinder chamber 30 as the drive shaft 4 is driven. I have to.

Further, an injection passage 5 is formed in the compression element 3, and the liquid refrigerant is injected from the injection passage 5 into the cylinder chamber 30 of the cylinder 31, whereby the cylinder 3
1 is cooled to prevent temperature rise during operation.

The formation of the injection passage 5 in the compression element 3 is as follows. That is, as clarified in FIGS. 1 and 2,
An insertion port 51 for the injection tube 6 is provided on the outer peripheral wall of the cylinder 31, and the injection tube 6 is inserted into the insertion port 51 from outside the casing 1 to be connected to the insertion port 51. A substantially L-shaped cylinder-side passage 52 is formed continuously with the mouth 51 and opens at the lower end surface of the cylinder 31. Also,
On the upper side of the rear head 33 facing the cylinder 31, an injection port 53 opened in the cylinder chamber 30 of the cylinder 31 and a communication facing the lower end side of the cylinder side passage 52 provided in the cylinder 31. A hole 54 is formed in the axial direction, and a circular recess 55 is formed on the surface of the rear head 33 opposite to the cylinder facing the injection port 53 and the communication hole 54. A cylindrical blind sealing plug 57 is attached to the opening of the recess 55 with a press-fitting means in a state of leaving a gap for communicating the injection port 53 and the communication hole 54 with each other. The communication passage 56 is formed by sealing the sealing plug 57.

The cylinder-side passage 52, which is substantially L-shaped, is continuous with the injection tube insertion port 51 formed on the cylinder 31 side, and the injection port 53 and the communication hole 54 are formed on the rear head 33 side. , The injection port 5 formed by sealing the sealing plug 57 into the recess 55.
The injection passage 5 is formed by 3 and the communication passage 56 that communicates the communication hole 54, and the liquid refrigerant from the injection tube 6 is injected into the cylinder chamber 30 via the injection passage 5.

As described above, when forming the injection passage 5, the injection port 53 opening to the cylinder chamber 30 of the cylinder 31 and the cylinder 31 on the upper side of the rear head 33 facing the cylinder 31. A communication hole 54 that communicates with the provided cylinder side passage 52 is formed respectively, and the recess 55 that allows the injection port 53 and the communication hole 54 to open is formed in the rear head 33 in the axial direction to form the recess 55. The injection passage 5 can be easily formed only by attaching the sealing plug 57 therein by the press-fitting means while leaving the communication passage 56, and when the sealing plug 57 is press-fitted into the recess 55. Even if the concave portion 55 is deformed due to press-fitting stress or the like, the concave portion 55
Is formed on the lower side of the rear head 33 in the axial direction, the distortion of the rear head 33 occurs only in the radial direction, and the distortion of the face surface of the rear head 33 hardly occurs. The sealability between the cylinder 31 and the rear head 33 can be satisfactorily maintained without impeding the sealability between the cylinder 31 and the rear head 33. Further, since the recess 55 is formed on the lower end surface side of the rear head 33 so as to open the injection port 53 and the communication hole 54 to each other, the recess 55 can be formed to have a relatively large diameter. Drilling can be done easily. Moreover, this recess 55
Since the injection port 53 and the communication hole 54 are formed continuously in the axial direction, which is the same as the depth direction of the recess 55, at the formation portion of the injection port 53, the injection port 53 and the communication hole 54 are formed. The sealing plug 5 for easily making a hole and additionally for sealing the recess 55
Since 7 can have a simple cylindrical blind shape, the sealing plug 57
The press-fitting work into the recess 55 can be easily performed.

In the above embodiment, the injection port 53, the communication hole 54, the recess 55, etc., which constitute the injection passage 5, are provided on the rear head 33 side, but the injection port 53 and the communication hole 54 are provided.
May be formed on the side of the front pad 32. Further, although the sealing plug 57 is press-fitted into the recess 55, the sealing plug 57 may be fitted in a hermetically sealed manner by interposing an O-ring or the like in the recess 55 in an intermediate portion in the vertical direction. .

Further, although the concave portion 55 has a straight shape having the same diameter, it has a stepped shape having a large diameter portion in the opening,
The position of the sealing plug 57 may be restricted. Further, although the recess 55 is circular, it may be oval or rectangular.

[0019]

As described above, in the rotary compressor of the present invention, the insertion port 51 of the injection tube 6 is formed in the cylinder 31, and the cylinder is provided on one side of the front head 32 and the rear head 33. An injection port 53 that opens into the cylinder chamber 30 of the cylinder 31 and a communication hole 54 that communicates with the cylinder side passage 52 of the injection passage 5 that is continuous with the insertion port 51 of the cylinder 31 are formed on the surface facing the cylinder 31. Then, the communication hole 54 and the injection port 5 are formed on the surfaces of the heads 32 and 33 that form the communication hole 54 and the injection port 53 opposite to the cylinder 31.
3 is formed so as to form a recess 55 and the recess 55 is sealed by a sealing plug 57 so that the communication hole 54 and the injection port 53 can communicate with each other.
Of course, even when the sealing plug 57 is press-fitted during processing, it is possible to almost eliminate the occurrence of distortion on the surface of the head 32 or 33 having the injection port 53 and the communication hole 54 facing the cylinder 31. In addition, the sealability between the cylinder 31 and the head 32 or 33 can be maintained well, and the injection port 53, the communication hole 54 and the recess 55 can be formed in the same direction, which facilitates the processing. In addition, since the sealing plug 57 only seals the recess 55, it can have a simple shape, and the sealing plug 57 can be easily attached to the recess 55. The injection passage 5 can be easily formed in the compression element 3.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a rotary compressor according to the present invention with a part thereof omitted.

FIG. 2 is a bottom view of the main part.

FIG. 3 is a sectional view showing an example of forming a conventional injection passage.

FIG. 4 is a sectional view showing another example of forming a conventional injection passage.

[Explanation of symbols]

 1 Airtight casing 2 Motor 3 Compression element 30 Cylinder chamber 31 Cylinder 32 Front head 33 Rear head 5 Injection passage 51 Insertion port 52 Cylinder side passage 53 Injection port 54 Communication hole 55 Recess 57 Sealing plug 6 Injection tube

Claims (1)

[Claims] 1. A rotary compressor in which a hermetic casing 1 is internally provided with a compression element 3 including a motor 31, a cylinder 31, a front head 32, and a rear head 33, and an injection passage 5 is provided in the compression element 3. The front head 32 and the rear head 33 are formed while forming the insertion port 51 of the injection tube 6.
On the other hand, on the surface facing the cylinder 31, an injection port 53 opening to the cylinder chamber 30 of the cylinder 31 and a cylinder side passage 52 in the injection passage 5 continuous with the insertion port 51 of the cylinder 31 are communicated. The head 32 or 3 which forms the communication hole 54 and forms the communication hole 54 and the injection port 53.
3 on the surface opposite to the cylinder 31 opposite to the communication hole 54.
The rotary compressor is characterized in that a recess 55 is formed so that the injection port 53 and the injection port 53 open, and the recess 55 is sealed by a sealing plug 57 so that the communication hole 54 and the injection port 53 can communicate with each other.