JP2864646B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll compressor.

2. Description of the Related Art As is well known, a scroll compressor has a suction chamber at an outer peripheral portion, a discharge hole provided at a central portion of a spiral, and a fluid having two symmetrical spiral-shaped compression spaces having a discharge port as a confluent point. It is known that the compression is effected by being sequentially compressed from the part toward the central compression chamber.

2 and 3 show the structure of a conventional scroll compressor. The scroll compression section 2, the motor 3, and the lubricating oil 23 are contained in the closed container 1. Scroll compressor 2
Is mainly composed of a fixed scroll 4, an orbiting scroll 5, a rotation preventing mechanism 6, a crankshaft 7, a frame 8, and a bearing 9. The fixed scroll 4 includes a spiral wrap 11 standing upright on a head plate 10, and the wrap 11 is formed by an involute curve, a curve combining circular arcs, or the like as conventionally known. In addition, a suction hole 12 for sucking compressed gas, a suction chamber 13 communicating with the suction hole 12, and a discharge hole 14 in the center of the end plate 10 are provided on the outer peripheral portion.

On the other hand, the orbiting scroll 5 has a head plate 15 and a spiral wrap 16 standing upright. The shapes of the wraps 11 and 16 of the fixed scroll 4 and the orbiting scroll 5 are symmetrical with respect to each other, and are shifted by 180 °. Furthermore, since the fixed scroll 4 and the orbiting scroll 5 are meshed with their respective vortex centers shifted by the orbital radius, the two wraps 11 and 16 come into contact or come closest at a plurality of points (hereinafter referred to as contact). ), A plurality of compression chambers 17 are formed. A boss 18 into which the crankshaft 7 is inserted is provided on the back of the orbiting scroll 5. A rotation preventing mechanism 6 is incorporated between the back surface of the orbiting scroll 5 and the frame 8. The crankshaft 7 is supported by a frame 8 via a bearing 9. One end is provided with a rotor of the motor 3, and the other end is provided with a boss 18 of the orbiting scroll 5.
Has been inserted.

Further, the fixed scroll 4 is provided with a check valve 20 for the purpose of closing the discharge hole 14 in order to prevent reverse rotation at the time of stop, and the check valve retainer 21 restricts the check valve 20 to movement only in the vertical direction. Further, the check valve 20 is urged in a direction to open the discharge hole 14 by gravity or a spring.

In this scroll-type compressor, lubricating oil enters the compression working space during stoppage, and a starting failure occurs due to lubricating oil compression during startup.

Therefore, when the crankshaft 7 is rotated by the rotation of the motor 3 in this configuration at the time of starting, the orbiting scroll 5 is opposed to the fixed scroll 4 in the opposite direction to the normal rotation direction of the compressor while maintaining the posture by the function of the rotation preventing mechanism. In the direction of rotation at a rotational speed lower than the standard rotational speed of the compressor. Then, the liquid refrigerant and the lubricating oil 23 accumulated in the compression chamber 17 formed by the engagement of the fixed scroll 4 and the orbiting scroll 5 are transferred from the suction chamber 13 to the suction hole 12.
To the accumulator 19 for temporarily storing a large amount of liquid. After the reverse rotation, the orbiting scroll 5 makes a orbital movement in the normal rotation direction, and the orbital movement gradually moves from the outer peripheral portion of the scroll to the center portion, and its volume decreases. As a result, the low-pressure gas taken in from the suction hole 12 passes through the suction chamber 13 and is compressed in the above-mentioned process, and is discharged into the closed casing 1 by pushing up the check valve 20 from the discharge hole 14 of the scroll compression part 2. It is. Thereafter, the high-pressure gas in the sealed container 1 is sent out from the discharge pipe 22 to the outside.

FIG. 3 shows the configuration of the fixed scroll 4, the check valve 20, and the check valve retainer 21. Orbiting scroll 5 at start
When is rotated in the direction opposite to the normal rotation, the check valve 20 remains in contact with the end face of the fixed scroll 4 due to the oil film force, and the discharge hole 14 is closed. As a result, the torque for rotating the orbiting scroll 5 in the reverse direction increases, and starting cannot be performed.

In order to solve the above problems, the present invention weakens the adhesive force due to the oil film force between the check valve 20 and the fixed scroll 4, causes the check valve 20 to fall by its own weight or a spring, and reverse rotation of the orbiting scroll 5. It is intended to reduce the torque at the time.

Means for Solving the Problems In order to solve the above problems, the present invention provides a groove in a portion of the end face of the fixed scroll which is in contact with a check valve near a discharge hole.

Operation The operation of the above means is as follows.

The present invention provides a groove in a portion of the fixed scroll end face, which is in contact with the check valve in the vicinity of the discharge hole, to reduce an adhesive force due to an oil film force between the check valve and the fixed scroll, and the check valve falls by its own weight. Thus, the torque at the time of reverse rotation of the orbiting scroll is reduced, and poor starting is prevented.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The basic configuration and operation are the same as those of the conventional example shown in FIGS.

An embodiment of the present invention will be described with reference to FIG. FIG. 2 shows the configuration of the fixed scroll 4, the check valve 20, and the check valve retainer 21. The fixed scroll 4 is provided with a discharge hole 14 at the center thereof.
Is provided. By providing this groove 24, the check valve 20
Reduces the adhesive force due to the oil film generated when it comes into contact with the fixed scroll 4, and the check valve falls by its own weight or a spring.
Since the check valve 20 does not block the discharge hole 14, the orbiting scroll 4 performs a revolving motion opposite to the normal direction performed for the purpose of returning the liquid accumulated in the compressor chamber to the accumulator 19 side at the time of starting. Torque can be reduced.

In the above embodiment, one groove is provided in the vicinity of the discharge hole 14. However, the same effect can be obtained with a plurality of grooves.

As is clear from the above embodiment, by providing a groove in the contact portion of the fixed scroll near the discharge hole with the check valve, it is possible to reduce the rotational torque when the orbiting scroll reversely rotates at startup. And startability can be improved.
A highly reliable scroll compressor can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the vicinity of a check valve according to an embodiment of the present invention,
FIG. 2 is a cross-sectional view of a conventional scroll compressor, and FIG. 3 is an exploded perspective view of the vicinity of a conventional check valve. 1 ... closed container, 3 ... motor, 4 ... wrap, 5 ...
Orbiting scroll, 6 ... anti-rotation mechanism, 7 ... crankshaft, 10 ... head plate, 16 ... lap, 17 ... compression chamber, 20 ...
Check valve, 21 ... Check valve holder, 23 ... Lubricating oil.

──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Sadao Kawahara 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shuichi Yamamoto 1006 Kadoma Kadoma, Kadoma City Osaka Pref. (72) Inventor Manabu Sakai 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Jiro Yuda 1006 Odaka Kadoma, Kadoma City Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Person Shigeru Muramatsu 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-3-149390 (JP, A) JP-A-1-313936 (JP, A) JP-A-61- 213556 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) F04C 18/02 311

Claims (1)

(57) [Claims] 1. A motor and a scroll compression section driven by the motor are provided in a sealed container, and lubricating oil for lubricating the scroll compression section is charged. The scroll compression section is wrapped on a head plate. A fixed scroll formed, and an orbiting scroll formed with a wrap on a head plate, forming a plurality of compression chambers meshing with the fixed scroll,
A rotation preventing mechanism for preventing rotation of the orbiting scroll and only orbiting; and a crankshaft for orbiting the orbiting scroll, and a discharge hole of the scroll compression section or a compressed gas discharge passage near the discharge hole. A check valve urged in a direction to open a discharge hole or a discharge passage by gravity or a spring, and further, a groove is provided in a contact portion of the discharge hole or the discharge passage around the check valve around the check valve, A scroll compressor that rotates a crankshaft temporarily in a direction opposite to a normal rotation direction at a rotation speed that is typically lower than the rotation speed at startup, and then rotates the crankshaft in the normal rotation direction.