JP2950396B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to a structure for protecting scroll blades from abnormal pressure generated by a liquid compression phenomenon.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional scroll compressor.
This will be described with reference to FIG. The scroll compressor has a scroll compressor 2 and a motor 3 built in a sealed container 1. The scroll compressor 2 mainly includes a fixed scroll 4, an orbiting scroll 5, an Oldham ring 6, a crankshaft 7, an eccentric bearing bush 8, a frame 9, a metal bearing 10, and a shaft 11. In this configuration,
When the shaft 11 is rotated by the rotation of the motor 3, the orbiting scroll 5 inserted through the Oldham ring 6 into the bearing bush 8 fitted into the crankshaft 7 makes an orbital movement with respect to the fixed scroll 4 without rotating. The compression chamber 12 formed by the engagement of the fixed scroll 4 and the orbiting scroll 5 moves to the center, and the volume of the taken-in refrigerant gas decreases, and a compression action occurs.

[0003] When the compressor is laid down and started when a large amount of refrigerant is condensed and accumulated in the compression chamber 12 while the compressor is stopped, a liquid compression phenomenon occurs, and abnormal pressure may damage the scroll wrap, A bearing load exceeding the allowable value may occur. As shown in FIG. 4, in order to reduce the abnormal pressure due to the liquid compression phenomenon, in the conventional compressor, a substantially rectangular square hole 13 is provided at the upper end of the crankshaft 7, and the rectangular hole 13 has a long side direction. The eccentric bearing bush 8 is fitted so that sliding is possible. A bearing hole 14 is provided in the eccentric bearing bush 8, and a driven shaft of the orbiting scroll 5 is rotatably fitted thereto. Further, the long side direction of the square hole 13 is set at a predetermined angle α with respect to the turning radius direction. Further, the eccentric bearing bush 8 is configured to press the spring 15 against the wall surface of the square hole so that the wrap of the fixed 4 and the orbiting scroll 5 do not contact in the radial direction. When an abnormal pressure occurs due to the liquid compression phenomenon, the eccentric bearing bush 8 slides beyond the pressing force of the spring 15, and the two wraps of the fixed 4 and the orbiting scroll 5 are released from the compressed state to reduce the abnormal pressure. .

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide means for eliminating abnormal pressure at the outer peripheral portion of the orbiting scroll when abnormal pressure is generated due to the liquid compression phenomenon, regardless of sliding of the eccentric bearing bush of the orbiting scroll. Aim.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a fixed scroll having a spiral wrap on a head plate and a orbiting scroll having a wrap of the same shape on the head plate are engaged with each other so as to face each other. By providing an Oldham ring between the provided grooves to prevent rotation of the orbiting scroll, the claw of the Oldham ring sliding on the groove wall on the rear side with respect to the turning direction of the orbiting scroll, It is characterized in that a spring having a sliding plate is provided and urged in a counter-rotating direction. Alternatively, a fixed scroll having a spiral wrap on a head plate and a orbiting scroll having a wrap of the same shape on the head plate are engaged with each other so as to face each other, and an Oldham ring is provided between grooves provided on the orbiting scroll and a frame. Provided, wherein the rotation of the orbiting scroll is prevented, in the frame, on the turning direction side of the orbiting scroll of the claw of the Oldham ring that slides with the groove wall on the front side with respect to the turning direction of the orbiting scroll, It is characterized in that a spring having a sliding plate is provided and biased in the turning direction.
Further, a concave portion is formed in the claw of the Oldhaming, and a spring is provided in the concave portion.

[0006]

According to the present invention, the spring provided on the pawl of the Oldham ring prevents the rotation of the orbiting scroll from rotating in the normal compression operation of the scroll compressor. It is pressed against the groove wall rearward with respect to the turning direction to perform a sliding motion. When an abnormal pressure is generated due to the liquid compression phenomenon, the abnormal pressure is applied in the direction opposite to the turning direction of the orbiting scroll, that is, in the direction of the spring, and the spring is pushed from the groove wall surface of the orbiting scroll through the sliding plate. Accordingly, the orbiting scroll is displaced in the orbiting direction by the displacement of the spring, and this displacement acts in the direction in which the two wraps of the orbiting scroll and the fixed scroll are separated, releasing from the compressed state and reducing the abnormal pressure. Alternatively, when the spring provided on the claw of the Oldham ring on the frame side is pressed against the groove wall surface of the frame in front with respect to the turning direction of the orbiting scroll and performs a sliding motion, the abnormal pressure is equal to the turning direction of the orbiting scroll. The spring is applied in the same direction, that is, in the direction of the spring, and the spring is pushed from the groove wall surface of the frame via the sliding plate.

[0007]

Embodiments of the present invention will be described below. This embodiment is the same as the conventional example shown in FIG. 1 except for the shapes of the orbiting scroll, the frame and the upper surface of the crankshaft, and therefore, the description of the overall configuration is omitted. The same number is used for the same component. The pawl 16 of the Oldham ring 6 is used to prevent the rotation of the orbiting scroll 5 in this embodiment.
The groove 18 provided on the orbiting scroll 5 on which the sliding member slides will be described with reference to FIGS. A spring 17 having a sliding plate 20 is provided in a concave portion 21 of a claw 16 of an Oldham ring that slides on a wall surface on the rear side with respect to a turning direction of two grooves 18 of the orbiting scroll 5. The sliding plate 20 of the spring 17 provided on the claw 16 of the Oldham ring is
Will slide on the wall surface on the side opposite to the turning direction of the motor. Spring 17
Is set so that it is not pushed into the concave portion 21 of the claw 16 of the Oldham ring by being pushed by the groove 18 of the orbiting scroll 5 during a normal orbiting motion. When an abnormal pressure is generated in the compression chamber 12, the pressure is applied in a direction opposite to the turning direction of the orbiting scroll 5 (a thick arrow in the drawing), and the wall surface of the groove 18 pushes the claw 16 of the Oldham ring to resist the pressing of the spring 17. Then, the sliding plate 20 is pressed into the concave portion 21 to displace the orbiting scroll 5. Due to this displacement, the two wraps of the orbiting scroll 5 and the fixed scroll 4 work in a direction in which they separate, and the compression chamber 1
2 is released from the compressed state and can reduce the abnormal pressure.

Alternatively, as shown in FIG. 4, a spring 1 having a sliding plate 20 on a claw 16 of an Oldham ring that slides on a wall surface on the front side with respect to a turning direction of two grooves 19 of a frame 9.
7 is provided. The sliding plate 20 of the spring 17 provided in the recess 21 of the claw 16 of the Oldham ring slides on the wall surface on the turning direction side of the groove 19 of the frame 9. The spring 17 is set so as not to be pushed by the claw 16 of the Oldham ring and to be pushed into the concave portion 21 of the claw 16 of the Oldham ring during a normal turning movement. When an abnormal pressure is generated in the compression chamber 12, the pressure is transmitted to the Oldham ring 6 in a direction opposite to the turning direction of the orbiting scroll 5, the claw 16 of the Oldham ring is pushed, and the spring 17 is pressed against the wall surface side of the frame 9. The sliding plate 20 is pressed against the recess 21 to displace the Oldham ring 6. Due to this displacement, the two wraps of the orbiting scroll 5 and the fixed scroll 4 act in a direction in which they are separated from each other, so that the compression chamber 12 is released from the compressed state and the abnormal pressure can be reduced.

[0009]

According to the present invention, when an abnormal pressure due to the liquid compression phenomenon is generated, the spring having the sliding plate slides on the wall surface on the rear side in the turning direction of the two grooves of the orbiting scroll. The compression chamber is released from the abnormal compression state when abnormal pressure is generated by installing or sliding the front wall surface in the turning direction of the two grooves of the frame and providing a spring having a sliding plate. The abnormal pressure can be reduced. At this time, the square hole on the upper surface of the crankshaft and the eccentric bearing bush are not required, and the shaft hole of the orbiting scroll needs to be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a scroll compressor.

FIG. 2A is a plan view showing a state in which a spring having a sliding plate is provided in a sliding groove of the orbiting scroll, and FIG. 2B is a plan view showing an Oldham ring fitted to the orbiting scroll. It is a top view which shows the state which combined.

FIG. 3 is a cross-sectional view of a main part showing a configuration of a claw of an Oldham ring equipped with a spring having a sliding groove of a orbiting scroll and a sliding plate in the present embodiment.

4 (A) is a plan view showing a state in which a spring having a sliding plate is provided in a sliding groove of a frame, and FIG. 4 (B) shows an Oldham ring fitted to the frame. It is a top view showing a state.

FIG. 5 is an explanatory view showing a conventional eccentric bearing bush mechanism on the upper surface of a crankshaft.

[Explanation of symbols]

 Reference Signs List 4 fixed scroll 5 orbiting scroll 6 Oldham ring 7 crankshaft 8 eccentric bearing bush 9 frame 12 compression chamber 13 square hole 14 shaft hole 15 bearing bush spring 16 Oldham ring pawl 17 spring 18 orbiting scroll sliding groove 19 frame sliding Groove 20 Sliding plate 21 Claw recess

Claims (3)

(57) [Claims] 1. A fixed scroll having a spiral wrap on a head plate and a orbiting scroll having a wrap of the same shape on the head plate are engaged with each other so as to face each other, and between a groove provided on the orbiting scroll and a groove provided on a frame. A spring provided with an Oldham ring to prevent rotation of the orbiting scroll, wherein a spring having a sliding plate behind a claw of the Oldham ring that slides in a sliding groove with respect to the orbiting direction of the orbiting scroll. A scroll compressor characterized by being biased in the anti-orbital direction by providing a scroll compressor. 2. A fixed scroll having a spiral wrap on a head plate and a orbiting scroll having a wrap of the same shape on the head plate are engaged with each other so as to face each other, and between a groove provided on the orbiting scroll and a groove provided on a frame. An Oldham ring provided to prevent rotation of the orbiting scroll, wherein a sliding plate is provided on a front side of a claw of the Oldham ring that slides in a sliding groove of the frame with respect to a turning direction of the orbiting scroll. A scroll compressor characterized by being provided with a spring having a bias and being urged in a turning direction. 3. A recess is formed in the Oldham's claw,
3. The scroll compressor according to claim 1, wherein the spring is provided in the recess.