JPH10281090A - Sealed type rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a postional relation have tolerance by providing a recessed part forming a third injection passage communicating a second injection passage provided on the tip plate part of a bearing and a first injection passage connected with an external injection circuit that a cylinder has. SOLUTION: An injection pipe 22 from an external circuit is communicated with a groove which is formed by being provided on the end face of a cylinder 4 and extending in the peripheral direction after the injection pipe 22 is led to a first injection passage 15 provided on the cylinder 4. This groove is clogged by assembling of an upper bearing 10, forms a third injection passage, is communicated with an injection port 14 which is provided on the end face part 10a of the upper bearing and opens in a compression chamber 18 within the cylinder 4 and is communicated with a second injection passage 17 which is radially arranged. By this constitution, the second injection passage 17 is communicated with the groove even if the location is changed by a prescribed angle and the location of the injection port 14 can be changed in the range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device for a hermetic rotary compressor used in an air conditioner or the like.

[0002]

2. Description of the Related Art FIG. 6 and FIG.
FIG. 1 is a cross-sectional view showing a conventional hermetic rotary compressor connected to an injection circuit disclosed in Japanese Patent No. 583 or Japanese Patent Application Laid-Open No. 55-125388.

[0003] In the figure, a motor element 2 is arranged in an upper part and a compression element 3 is arranged in a lower part in a closed container 1.

The compression element 3 includes a cylinder 4, a rolling piston 7 fitted in an eccentric portion 6 of a rotary shaft 5 in the cylinder 4 and rotating eccentrically, and a cylinder 4 constantly pressed against the rolling piston 7. Vanes (not shown) for partitioning the inside into a high-pressure chamber and a low-pressure chamber, and an end plate 10a for closing both ends of the cylinder 4
And upper bearing 1 comprising bearing portion 10b for supporting rotary shaft 5
And a lower bearing 13 composed of an end plate portion 13a and a bearing portion 13b.

In FIG. 6, an injection pipe 22 connected to an external injection circuit is connected to an end plate 10a of the upper bearing 10, and an injection port 14 is bored in the end plate 10a.

Thus, as shown in FIGS. 8 and 9, the injection port is closed and opened by the movement of the rolling piston during one rotation of the rotating shaft, and the injection timing and the injection amount into the compression chamber are determined by this and the pressure condition. Is done.

[0007] In the example of FIG.
Is connected to the cylinder 4 and the injection port 14
Are bored in the cylinder inner cylinder surface.

[0008]

Since the hermetic rotary compressor connected to the conventional injection circuit is configured as described above, in the example of FIG. 6, the injection pipe 22 is connected to the bearing end plate 10a. In this case, the workability is poor due to the long insertion distance when the injection pipe 22 is inserted to the bearing end plate portion 10a, and the deformation force due to the insertion of the injection pipe 22 and the distortion due to welding between the injection pipe 22 and the sealed container 1 As a result, there has been a problem that the bearing force is significantly impaired and the reliability is deteriorated due to the axial displacement and the like caused by the deformation force accompanying the above.

When the injection port 14 is provided on the cylinder inner cylinder surface as shown in FIG. 7, the cylinder inner wall and the outer periphery of the rolling piston come into line contact, and the injection port closing function depends on oil and pressure resistance. Depending on the size of 14, high and low pressure leaks are promoted and cause performance degradation.

[0010] Further, since the position where the pipe from the external injection circuit is connected to the compressor container is restricted due to being mounted on the outdoor unit of the air conditioner, a design for setting the opening timing of the injection port is required. There was a problem that the above-mentioned degree of freedom was reduced.

The present invention has been made to solve such a problem. Even when a connection pipe from an injection circuit is connected to a cylinder fixed to an airtight container, a connection between the external injection circuit and the airtight container is made. An object of the present invention is to provide a hermetic rotary compressor in which the position of an injection port can be set with a degree of freedom from the position, and when a plurality of injection port positions are set, parts can be shared.

It is another object of the present invention to provide a hermetic rotary compressor having a low-priced injection circuit which does not require the addition of new parts to prevent the injection passage closing means from coming off.

[0013]

According to the present invention, there is provided a hermetic rotary compressor according to the present invention, comprising: a hermetic container accommodating an electric element and a compression element; an outer peripheral portion fixed to the hermetic container provided on the compression element; A first injection passage connected to an external injection circuit which is open at the end of the cylinder, an upper and lower bearing having an end plate portion provided in the compression element and closing both open ends of the cylinder, and an end plate portion of the bearing An injection port that is provided in the compression chamber of the compression element, and a second injection passage that is provided in the end plate of the bearing, communicates with the injection port, and is formed in the radial direction, and an opening end surface of the cylinder. Alternatively, the second injection passage is provided in an end face portion of the bearing on the cylinder side and is provided in an arbitrary radial direction to change the position of the injection port. In case of providing also, by combining the cylinder and the bearing, and a recess forming a third injection passageway which communicates with the second injection passageway and a first injection passageway, the provided.

Further, in the hermetic rotary compressor according to the present invention, the recess is formed by a groove extending in the circumferential direction.

Further, in the hermetic rotary compressor according to the present invention, the first injection passage is constituted by a radial injection passage and an axial injection passage.

Further, the hermetic rotary compressor according to the present invention is provided with a closing means for closing an opening end of the second injection passage opposite to the injection port.

Further, in the hermetic rotary compressor according to the present invention, a stepped hole for accommodating the closing means is provided at the opening end.

In the hermetic rotary compressor according to the present invention, the closing means is made of an elastic body.

Further, in the hermetic rotary compressor according to the present invention, the discharge muffler press-fitted to the outer peripheral portion of the end plate portion of the bearing.
And the discharge muffler is configured to prevent the closing means from coming off.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. 1 to 5 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a hermetic rotary compressor, FIG. 2 is a detailed assembly view of an injection passage, and FIG.
2 is a view as seen from the direction B in FIG. 2, FIG. 4 is a view as seen from the direction A in FIG. 2, and FIG. 5 is a detailed view of the injection passage of the bearing end plate.

In FIG. 1, an electric motor element 2 is arranged in an upper part and a compression element 3 is arranged in a lower part inside a closed container 1. The compression element 3 includes a cylinder 4 to which an injection pipe 22 connected from an external injection circuit is connected, a rolling piston 7 fitted in the eccentric portion 6 of the rotary shaft 5 in the cylinder and rotating eccentrically; An upper bearing comprising a vane (not shown) which constantly presses against the ring piston and divides the inside of the cylinder into a high-pressure chamber and a low-pressure chamber, an end plate 10a for closing the cylinder opening, and a bearing 10b for supporting the rotary shaft 5; 10 and a lower bearing 13 similarly comprising an end plate portion 13a and a bearing portion 13b. The upper bearing end plate portion 10a communicates with an injection passage in the cylinder and communicates with an injection port 14 opening to the compression chamber 18. Passage 17 which is the injection passage of
Are arranged in the radial direction.

Next, the details of the injection passage will be described with reference to FIG. An injection pipe 22 from an external circuit is guided to a radial injection passage 15a and an axial injection passage 15b, which are first injection passages provided in the cylinder 4, and then a peripheral portion which is an example of a concave portion provided on an end face of the cylinder. It communicates with the groove 16 formed extending in the direction. This groove is closed by assembling the upper bearing 10 as shown in FIG. 2 to form an injection passage which is a third injection passage, and communicates with an injection passage 17 provided in the upper bearing end plate 10a. The concave portion is not limited to the groove 16 formed so as to extend in the circumferential direction, and may have another shape as long as it communicates with the injection passage 17 and the axial injection passage 15b.

With this configuration, the injection passage 17 communicates with the groove 16 even if the position of the injection passage 17 is changed by the angle α in FIG. 2, so that the position of the injection port 14 can be changed within that range. Can be changed.

Therefore, the connection position from the external injection circuit to the closed container 1 and the injection port 14
The position of the injection port 14 can be changed inside the compressor without changing the connection position from the external injection circuit to the closed vessel 1 in accordance with the air conditioner, in accordance with the air conditioner. Thus, the timing of opening the injection port 14 can be set.

Next, details of the injection passage 17 of the bearing end plate portion 10a will be described with reference to FIG. The open end side of the injection passage 17 provided in the bearing end plate portion 10a is formed in a stepped shape 20 which is a stepped hole portion having a different diameter, and a discharge muffler 21 is press-fitted on the outer periphery of the bearing end plate portion 10a. It is configured to: Accordingly, it is possible to prevent the elastic body 19 provided for closing the open end from moving in the injection passage 17 or coming out of the injection passage 17.

Embodiment 2 FIG. In the first embodiment, the injection passage 17 is provided in the upper bearing end plate portion 10a. However, the injection passage 17 may be provided in the lower bearing end plate portion 13a. It has the same effect as.

Embodiment 3 In the first embodiment, the circumferential groove 16 is provided on the end face of the cylinder 4, but may be provided on the bearing end plates 10a and 13a.

[0028]

As described above, according to the present invention, it is possible to allow a margin in the positional relationship between the connection position from the external injection circuit to the closed container and the injection port. The timing of opening the injection port can be set by changing the position of the injection port inside the compressor without changing the connection position from the external injection circuit to the closed container. Further, it is not necessary to add a new part to prevent the second injection passage from being closed by the closing means, and it is possible to provide a hermetic rotary compressor having a low-cost injection circuit.

[Brief description of the drawings]

FIG. 1 is a view showing an example of an embodiment of the present invention, and is a longitudinal sectional view of a hermetic rotary compressor.

FIG. 2 is a view showing an example of an embodiment of the present invention, and is a detailed view of the assembly of an injection passage.

FIG. 3 is a diagram viewed from a direction B in FIG. 2;

FIG. 4 is a diagram viewed from a direction A in FIG. 2;

FIG. 5 is a view showing an example of an embodiment of the present invention, and is a detailed view of an injection passage of a bearing end plate portion.

FIG. 6 is a cross-sectional view of a conventional hermetic rotary compressor.

FIG. 7 is a cross-sectional view of another conventional hermetic rotary compressor.

FIG. 8 is a cross-sectional view of a general hermetic rotary compressor when an injection port is open.

FIG. 9 is a cross-sectional view of a general hermetic rotary compressor when an injection port is closed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Closed container, 2 electric elements, 3 compression elements, 4 cylinders, 5 rotation shafts, 6 rotation shaft eccentric parts, 7 rolling pistons, 10 upper bearing, 10a upper bearing end plate part, 10
b Upper bearing, 13 Lower bearing, 13a Lower bearing end plate, 13b Lower bearing, 14 Injection port, 15 Cylinder injection passage, 16
Groove, 17 Injection passage for bearing, 18 Compression chamber, 19 Plug, 20 Stepped part, 21 Discharge muffler.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Katsumi Endo 2-6-1, Otemachi, Chiyoda-ku, Tokyo Mitsubishi Electric Engineering Co., Ltd.

Claims (7)

[Claims] 1. A closed container containing an electric element and a compression element, and an outer peripheral portion provided on the compression element and fixed to an outer peripheral portion of the closed container, and opened at the outer peripheral portion to be connected to an external injection circuit. A cylinder having a first injection passage; an upper and lower bearing having an end plate portion provided in the compression element for closing both open ends of the cylinder; a compression and compression member provided in an end plate portion of the bearing; An injection port that opens into a chamber; a second injection passage provided in an end plate portion of the bearing and communicating with the injection port and formed in a radial direction; and an opening end surface portion of the cylinder or an end of the bearing. The second injection passage is provided at an end portion of the plate portion on the cylinder side, and the second injection passage is changed to an arbitrary position to change a position of the injection port. In case of providing the radial direction,
By combining the cylinder and the bearing,
A hermetic rotary compressor, comprising: a recess forming a third injection passage connecting the second injection passage and the first injection passage. 2. The hermetic rotary compressor according to claim 1, wherein the recess is formed by a groove formed to extend in a circumferential direction. 3. The hermetic rotary compressor according to claim 1, wherein said first injection passage comprises a radial injection passage and an axial injection passage. 4. The hermetic rotary compressor according to claim 1, further comprising closing means for closing an open end of the second injection passage opposite to the injection port. 5. The hermetic rotary compressor according to claim 4, wherein a stepped hole portion for accommodating the closing means is provided at the opening end. 6. The hermetic rotary compressor according to claim 4, wherein said closing means is made of an elastic body. 7. The bearing according to claim 4, further comprising a discharge muffler press-fitted into an outer peripheral portion of an end plate portion of the bearing, wherein the discharge muffler prevents the closing means from coming off. Hermetic rotary compressor.