JPH04325790A - Normal/reverse rotating scroll compressor - Google Patents

Abstract

PURPOSE:To make the switching of a check valve positive so as to prevent the vibration of the valve under a specific condition in a check valve device additionally provided at the discharge hole of a scroll shaft, and simplify the machining of the scroll shaft. CONSTITUTION:A check valve device 50 is formed of a circular valve body 51 for switching the discharge opening 42 of a discharge hole, and a valve guide 52 for guiding the valve body 51 in the rotating direction. This valve body 51 is provided with a large hole 53 communicated with the discharge opening of the discharge hole at the time of normal rotation, and a small hole 54 communicated with the discharge opening of the discharge hole at the time of reverse rotation.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to refrigeration and air conditioning equipment.
The present invention relates to a double-rotating scroll compressor for compressing refrigerant.

0002

2. Description of the Related Art In general, a scroll compressor, which is a type of positive displacement compressor that performs compression by combining a pair of spiral wraps, is widely known as a scroll fluid machine. Usually, this type of scroll compressor is of a type in which one spiral wrap is fixed and the other spiral wrap is oscillated to perform the compression action, or
There is a so-called double-rotation type in which both spiral wraps are rotated around their respective centers, and the principle of operation thereof is known, for example, from the specification of US Pat. No. 3,884,559. For example, Japanese Patent Publication No. 1-35196 and Japanese Patent Application Laid-Open No. 63-8008 are known as the double-rotation type scroll compressor.
9 and Japanese Patent Application Laid-Open No. 1-200083, the basic structure of which is shown in FIG. 3.

The dual rotary scroll compressor shown in FIG. 3 has an electric element 2 disposed above a container 1, and a scroll compression element 3 housed in the lower side of the closed container. , a first scroll 7 having a shaft 4 connected to an electric element 2 and having a spiral wrap 6 erected on an end plate 5, and a shaft 8 eccentric from the center of the shaft 4 of the first scroll 7. A second scroll 11 has a spiral wrap 10 erected on an end plate 9 so as to face and engage with the first scroll 7, and a main bearing 12 that pivotally supports the shaft 4 of the first scroll 7. a main frame 13 having a main frame 13; an auxiliary frame 15 having an auxiliary bearing 14 that pivotally supports the shaft 8 of the second scroll 11; These scrolls are rotated in the same direction so that compression is performed by gradually reducing the plurality of compression spaces 17 formed by the scroll 7 and the second scroll 11 from the outside to the inside. It is composed of an Oldham joint 18.

[0004] The operating principle of this double-rotating type scroll compressor will be explained. The first scroll 7 is rotated about its axial center O1 by the driving source of the electric element 2, and the second scroll 7 is rotated in synchronization with this rotation. The scroll 11 also rotates around its axial center O2. Therefore, by the rotation of both scrolls 7 and 11, both spiral wraps 6
, 10 moves toward the center, its volume decreases, the pressure of the compressed gas increases, and the discharge passage 1
9 and is discharged from the discharge port 20 as high-pressure gas. In the case of the dual rotation system, the discharge passage 19 is often provided within the shaft 4 of the first scroll 7 on the drive side, and as a conventional technique, as shown in FIG. There is an example in which a check valve 21 formed by a spring and a floating valve is provided at the inlet. However, the check valve of the double-rotation system as shown in FIG. 3 has a problem from the standpoint of starting in reverse rotation.

[0005] Furthermore, there is a compressor shown in FIGS. 4A and 4B that has been developed as an improved version of the conventional double-rotating type scroll compressor shown in FIG. FIG. 4A is a longitudinal sectional side view of a double-rotation type scroll compressor in which a circular check valve with a rotor end as a backer valve, developed by the present applicant, is incorporated. In FIG. 4A, parts common to those in FIG. 3 are designated by the same reference numerals, and the explanation thereof will be omitted, and the newly used discharge valve will be explained. The electric element 2 in FIG. 3 is housed in a sealing element 35 as an electric element 34 having a rotor 31 and a stator 33 in FIG. 4A. Moreover, the discharge passage 1 in FIG.
9 and the check valve 21 in FIG. 4(A), the discharge hole 3
The end ring 32 of the rotor 31 serves as a discharge valve 37 that has an outlet opening of 6 near the rotor 31 and opens and closes the outlet opening of the discharge hole 36 on the shaft of the first scroll 7.
Thus, the outlet opening of the discharge hole 36 can be regulated. FIG. 4B is a plan view of the discharge valve 37 and the like included in the double-rotation type scroll compressor of FIG. 4A. The discharge valve 37 is installed at a position corresponding to the discharge hole 36,
The valve plate 38 is fixed by a bolt 40 so as to be held on the shaft by a bolt seat 39, and the tip of the valve plate 38 opens and closes the outlet opening of the discharge hole 36, and the opening degree is determined by the end ring 3.
It is now regulated by 2. And again,
A type in which a discharge opening 41 is newly provided in the circular type check valve shown in FIG. 4 has been considered to allow gas backflow during reverse rotation.

[0006]

However, the conventional double-rotating type scroll compressor as described above has the following problems. ■ The opening and closing of the check valve is uncertain. ■ There is a lot of noise due to valve vibration under certain conditions. ■ Since the scroll shaft has a valve mechanism inside and has a complicated structure, machining the shaft is troublesome.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention accommodates an electric element and a scroll compression element in a closed container, and connects the scroll compression element to a shaft connected to the electric element. a first scroll having a spiral wrap erected on an end plate; and a scroll having an axis eccentric to the center of the axis of the first scroll, the end plate facing and meshing with the first scroll. a main frame having a main bearing for pivotally supporting the shaft of the first scroll;
an auxiliary frame having an auxiliary bearing for pivotally supporting the shaft of the scroll, and the first scroll and the second scroll housed in a hollow chamber formed inside by the main frame and the auxiliary frame. It consists of an Oldham joint that rotates these scrolls in the same direction so that compression is performed by gradually contracting a plurality of compression spaces from the outside to the inside. At least one shaft of the first and second scrolls is provided with a discharge hole, and at startup, the scroll compression element is rotated in the reverse direction and then rotated in the forward direction to enter operation. In the double-rotation type scroll compressor, a check valve device is provided on the shaft provided with the discharge hole, and the check valve device includes an arc-shaped valve body that opens and closes a discharge opening of the discharge hole, and the valve body. and a valve guide that guides the valve in the direction of rotation, and the valve body is provided with a large hole that communicates with the discharge opening of the discharge hole during forward rotation and a small hole that communicates with the discharge opening of the discharge port during reverse rotation. The present invention aims to provide a double-rotation type scroll compressor.

[0008]

[Operation] During forward rotation, the larger hole of the valve body communicates with the discharge opening of the discharge hole due to the inertia of the valve body, and the gas compressed in the compression chamber is discharged. During startup, the smaller hole in the valve body communicates with the discharge opening of the discharge hole, allowing minimal backflow of gas to drain wet oil into the compression chamber.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a double rotary scroll compressor according to the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional side view of a double rotary scroll compressor according to the present invention. In FIG. 1, parts common to those in FIG. 3 are denoted by the same reference numerals, and a description thereof will be omitted, and a description will be mainly given of the discharge valve newly used according to the present invention. Fig. 2 shows an embodiment of the check valve device incorporated in the double-rotation type scroll compressor of Fig. 1, in which (A) in Fig. 2 is a longitudinal cross-sectional side view during normal rotation, and (B) in the same figure is the same figure. (A) is a cross-sectional plan view of FIG. In FIG. 2, 4 indicates the axis of the first scroll in FIG. 1, and 42 indicates the discharge opening of the discharge hole in FIG. A check valve device 50 is provided on the shaft 4 of the first scroll, and the check valve device 50 is connected to the discharge opening 42.
It is composed of an arc-shaped valve body 51 that opens and closes, and a valve guide 52 that guides the valve body 51 in the rotational direction.The valve body 51 has a large hole 53 that communicates with the discharge opening 42 of the discharge hole during forward rotation.
and a small hole 54 that communicates with the discharge opening 42 during reverse rotation. In this embodiment, the check valve device 50 is provided on the shaft 4 of the first scroll, but the check valve device 50 may also be provided on the shaft of the second scroll.

0010

[Effects of the Invention] Since the double rotary scroll compressor according to the present invention is constructed as described above, it has the following effects. ■ The valve body has a large hole and a small hole, allowing the check valve to open and close reliably. ■ In the case of a flat valve, the valve will vibrate under certain conditions, but since inertia is used to open and close the valve as in the present invention, this phenomenon does not occur as in the case of a flat valve. (2) The conventional type in which the valve mechanism is built into the shaft has a complicated structure, but in the case of the present invention, the machining of the shaft is simplified.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of an embodiment of a double rotary scroll compressor according to the invention.

FIG. 2 shows an example of the check valve incorporated in the double-rotation type scroll compressor in FIG. (A) cross-sectional plan view of
(C) of the same figure is a longitudinal cross-sectional side view during reverse rotation, and (D) of the same figure is a cross-sectional plan view of (C) of the same figure.

FIG. 3 is a vertical side view of a conventional double-rotating scroll compressor.

FIG. 4 shows a double-rotating scroll compressor incorporating a circular check valve with a backer valve at the rotor end, where (A) is a longitudinal side view and (B) is an A of (A).
-A cross-sectional plan view.

[Explanation of symbols]

3 Scroll compression element 4 First scroll axis 7 First scroll 8 Second scroll axis 11 Second scroll 13 Main frame 15 Auxiliary frame 18 Oldham joint 34 Electric element 35 Sealed container 42 Discharge opening 50 Check valve 51 Valve body 52 Valve guide 53 Large hole 54 Small hole

Claims (1)

[Claims] Claim 1: A motor-driven element and a scroll compression element are housed in a closed container, and the scroll compression element has a shaft connected to the motor-driven element, and a spiral wrap is erected on an end plate. a scroll, a second scroll having an axis eccentric to the center of the axis of the first scroll and having a spiral wrap erected on an end plate that faces and engages with the first scroll; a main frame having a main bearing that pivotally supports the shaft of the scroll;
an auxiliary frame having an auxiliary bearing for pivotally supporting the shaft of the scroll, and the first scroll and the second scroll housed in a hollow chamber formed inside by the main frame and the auxiliary frame. It consists of an Oldham joint that rotates these scrolls in the same direction so that compression is performed by gradually contracting a plurality of compression spaces from the outside to the inside. At least one shaft of the first and second scrolls is provided with a discharge hole, and at startup, the scroll compression element is rotated in the reverse direction and then rotated in the forward direction to enter operation. In the double-rotation type scroll compressor, a check valve device is provided on the shaft provided with the discharge hole, and the check valve device includes an arc-shaped valve body that opens and closes a discharge opening of the discharge hole, and the valve body. The valve body is provided with a large hole communicating with the discharge opening of the discharge hole during forward rotation and a small hole communicating with the discharge opening of the discharge hole during reverse rotation. A double-rotating scroll compressor characterized by: