JPH0842465A - Hermetic scroll fluid device - Google Patents

Abstract

PURPOSE:To relieve pressure pulsation of discharge pressure and to subdue the noise by closely adhering the peripheral surface of a fixed scroll/frame to an inner wall of a hermetic vessel so as to form a discharge chamber, so that compressed air is sent out from a discharge opening of the fixed scroll to the outside of the hermetic vessel via the discharge chamber. CONSTITUTION:An outer peripheral surface of a fixed scroll 2 or a (fixed) frame 4 is closely adhered to an inner wall of a hermetic vessel 1, so that a discharge chamber 20, or a comparatively wide gas area covered with the closed vessel 1, is formed between an end-surface of the fixed scroll 2 and the inner wall of the hermetic vessel 1. Compressed gas is discharged once from a discharge opening 2d, which is prepared in the central part of the fixed scroll 2, into the discharge chamber 20, where the gas flow velocity is lowered, and then sent out of the hermetic vessel 1. With this contrivance, pressure pulsation of the discharge pressure can be relieved, and an occurrence of a noise, which is attributable to this pressure pulsation, can be subdued. At the same time, oil within refrigerant gas can efficiently be separated by this discharge chamber 20.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic scroll fluid device used as a refrigerant compressor for refrigeration and air conditioning. A conventional structure of a hermetic scroll compressor is disclosed in Japanese Patent Laid-Open No. 53-35840. In this reference, the scroll fluid device is fixed in a closed container via a flange. Further, a structure is disclosed in which a refrigerant gas is guided to the outside of a hermetically sealed container and discharged from a discharge port at the center of a fixed scroll, which is a compression element portion of a scroll fluid device. It should be noted that the space inside the airtight container is guided by the suction gas, and the structure is in an atmosphere of suction pressure that is a low pressure including the periphery of the electric motor. As a technical problem of a hermetic scroll compressor, in the above cited example, the scroll fluid device is fixed in a hermetically sealed container via a flange. In this case, the number of parts used increases and there is a problem in downsizing and weight reduction of the entire device.Furthermore, the refrigerant gas is sealed from the discharge port at the center of the fixed scroll, which is the compression element of the scroll fluid device. Since the structure is such that it is directly guided to the outside and discharged, the pressure pulsation of the discharge pressure is large, which promotes vibration of the discharge pipe,
There were problems such as cracks in pipes and noise. The present invention has been invented in view of the above problems, and an object of the present invention is to reduce the diameter of a hermetically sealed container for accommodating a scroll compression element to reduce the size and weight of the entire apparatus. The pressure pulsation of the discharge pressure is reduced, and the vibration of the discharge pipe is reduced to prevent cracks in the discharge pipe, suppress the generation of noise due to the pressure pulsation, and improve the reliability of the compressor. In addition, it is also an object of the present invention to provide a sealed scroll fluid device that efficiently separates the lubricating oil circulating in the closed container and prevents the oil from flowing out of the machine. In order to achieve the above object, in a hermetic scroll fluid device according to the present invention, a scroll compression element portion and an electric motor are continuously provided in a hermetic container via a main shaft. The scroll compression element portion includes a fixed scroll and an orbiting scroll which are engaged with each other with a spiral wrap inside, a rotation preventing member for preventing rotation of the orbiting scroll from rotating, and the fixed scroll. A fixed frame is provided with a coupled frame and a main shaft rotatably supported by a frame via a bearing and connected to an electric motor.The fixed scroll is provided with a discharge port opening to the center and a suction port opening to the outer periphery. , Refrigeration for air-conditioning, in which gas is sucked from the suction port and the volume is reduced while moving the enclosed space formed by both scrolls to the center to compress the gas In a hermetic scroll fluid device used as a medium compressor, at least one outer peripheral surface of the fixed scroll or the frame is closely coupled to the inner wall of the hermetic container, and the non-lap side of the fixed scroll end plate is covered with the hermetic container. A discharge chamber having a wide gas area is formed, and a compressed gas is discharged from the discharge port provided at the center of the fixed scroll to the discharge chamber and then discharged to the outside of the closed container. It is characterized by that. According to the above-mentioned structure of the present invention, since the outer peripheral surface of at least one of the fixed scroll and the frame is closely bonded to the inner wall of the closed container, the diameter of the closed container can be kept small. In addition, the refrigerant gas passing through the discharge port from the compression space formed by both scrolls,
Since it is once discharged into the discharge chamber of a space that is a relatively wide gas area, the gas flow velocity is greatly reduced and the pressure pulsation width of the discharge pressure can be greatly reduced. The oil can be efficiently separated. An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. 1 and 2 show an embodiment of the present invention. The closed container 1 is divided into two parts 1a and 1b, and these two parts are later joined to form an integral airtight container. The fixed scroll 2 includes an end plate 2a,
It consists of a wrap 2b standing upright on this end plate 2a. Further, the fixed scroll is provided with a suction port 2c at its outer peripheral portion and a discharge port 2d at its central portion. The discharge port 2d opens in the closed container chamber 1 and maintains the closed container 1 at a discharge pressure. The orbiting scroll 3 includes a wrap 3b standing upright on a disk-shaped end plate 3a, and a scroll boss 3c formed on the surface (back surface) on the side opposite to the wrap. Both scrolls 2, 3
Each of the wraps 2b and 3b is shaped as an involute curve or a curve similar thereto. These fixed scroll 2 and orbiting scroll 3 are wrapped with each other by wraps 2b, 3
B is engaged in a state of facing each other. Frame 4 is
It has a space for accommodating the orbiting scroll 3 and an automatic blocking member 5 described later, is connected to the outer peripheral portion of the fixed scroll 2 by several bolts (not shown), and its frame 4 is also provided.
The outer peripheral surface of is closely attached to the inner wall of the closed container 1 and is joined thereto. A rear surface of the end plate 3a of the orbiting scroll 3 is supported by the frame 4 so that the end plate 3a can move without being far from the end plate 2a of the fixed scroll 2. The rotation preventing member 5 is composed of a ring having grooves (not shown) on one surface and the other surface and an Oldham key fitted into each groove, and the grooves are orthogonal to each other. An Oldham key 6 fixed to the frame 4 is fitted in one groove. The main shaft (crankshaft) 7 is supported by a bearing 8 attached to the frame 4. An eccentric shaft (crank pin) 7a is provided on the head of the crankshaft 7.
Is provided at a position separated from the axis of the crankshaft 7 by a distance corresponding to the turning radius ε.
a is fitted into and engaged with the orbiting scroll boss 3c. A space (axial gap) extending in the axial direction is formed above the upper end surface of the crank pin 7a in the engaging portion between the two. The oil supply hole 9 is formed in the crankshaft 6 from its lower end surface to its head portion, and opens at the upper end surface of the crankpin portion. Reference numeral 11 is an electric motor, and its stator is closely attached to the inner wall of the hermetically sealed container 1. Reference numeral 12 is a suction pipe, and reference numeral 13 is a discharge pipe. The space inside the closed container is defined by the frame 4 and the discharge chamber 20 on the side opposite to the wrap of the fixed scroll 2 and the electric motor 1.
The flow passage 21 (21a, 21b, 21c, 21c, 21c, 21c, which is divided into the electric motor chamber 22 on the first side and connects the discharge chamber 20 and the electric motor chamber 22 to each other.
21d, 21e) on the outer edge of the frame and the closed container 1
It is provided along the inner wall of a. A discharge pipe 13 that discharges gas from the electric motor chamber 22 side is provided. The discharge pipe 13 is
A closed container 1 which is located above the motor chamber 22 and near the outer edge of the frame 4 and which does not axially overlap the communication passage 21.
It is installed on the wall of a. In FIG. 1, the refrigerant gas that has passed through the discharge port 2d from the compression space formed by the scrolls 2 and 3 is a discharge chamber 2 of a space that once becomes a relatively wide gas region.
It is discharged to 0. The gas flow velocity of the refrigerant gas discharged to the discharge 20 is significantly reduced, and the pressure pulsation width of the discharge pressure is greatly reduced. Next, the oil supply passage 10 is provided with an orbiting scroll 3.
Are provided at the center of the orbiting scroll 3 and extend radially from the center of the orbiting scroll 3. The center of the oil supply passage 10 and the oil supply hole 9 communicate with the space (axial gap) formed in the engaging portion between the scroll boss 3c and the crankshaft 7. Further, the oil discharge end of the oil supply passage 10 is opened to the sliding surface between the fixed scroll 2 and the orbiting scroll 3. FIG. 3 shows another embodiment of the oil supply passage 10, in which the oil discharge end of the oil supply passage 10 is opened to the end surface of the wrap 3b. Others are the same as FIG. 1 and FIG. FIG. 4 shows still another embodiment of the oil supply passage 10, in which the oil discharge end of the oil supply passage 10 is opened to the closed space V1. Others are the same as those in FIGS. 1 and 2.
The oil stored in the bottom portion of the closed container 1 receives the discharge pressure, rises in the oil supply hole 9 and flows into the space (axial gap) of the engaging portion, enters the oil supply passage 10 from this, and then the fixed scroll 2 And the sliding surface of the orbiting scroll 3, the sliding surface of the wrap 3b and the end plate 2a of the fixed scroll 2, or the sealed space V1. The refrigerant gas is introduced into the compression element portion in the closed container through the suction pipe 12, is compressed therein, and the lubricating oil supplied to the sliding portion and the bearing is supplied to the compression element portions 2 and 3. Guided and mixed. The refrigerant gas mixed with the lubricating oil becomes high temperature and high pressure and is discharged from the closed space into the discharge chamber 20 through the discharge port 2d at the center of the fixed scroll. The refrigerant gas once discharged into the discharge chamber 20, which is a relatively wide gas region, is further present at the outer edge portion of the frame 4 and the closed container 1
Through the communication flow path 21 (21a, etc.) provided along the inner wall of the above, it moves to the electric motor room 22 of a wider space. Due to the structure of the communication passage 21 that acts as a throttling action between two spaces in such a container, the pressure pulsation of the discharge pressure can be reduced in two stages, and the pressure pulsation width of the discharge pressure can be further widened. Can be reduced to Therefore, the vibration amplitude of the discharge pipe 13 that guides the gas from the electric motor chamber 22 to the outside of the device is significantly reduced. In addition, the pipe stress at the root of the discharge pipe 13 can be reduced, and a pipe crack accident can be prevented in advance. As another effect, the above-described refrigerant gas mixed with lubricating oil in the configuration of FIG. 1 is discharged from the closed space into the discharge chamber 20 which is a gas region relatively wider than the discharge port 2d at the center of the fixed scroll. A part of the oil mixed in the refrigerant gas is separated from the refrigerant gas due to the collision effect on the inner wall surface of the cover 1b, the direction conversion effect of the gas flow spreading in all directions, and the reduction of the gas velocity. In addition, since the oil separated in the discharge chamber 20 is relatively oily (liquid), most of the oil is mixed in the refrigerant gas when flowing into the electric motor chamber 22, and the compressed gas is mixed downward in the electric motor chamber 22 to form oil. The gravity effect that acts can be effectively utilized for the oil separation action. As a result, oil is removed from the refrigerant gas, the amount of oil rising can be suppressed, and the compressed refrigerant gas is extracted to the outside through the electric motor chamber 22, so that the electric motor 11 is cooled by the refrigerant gas. Although the discharge pressure was used when oil was supplied to each sliding surface and the closed space V1, the lower end of the oil supply hole 9 was opened at the axis and the head was placed at a position away from the axis. If you open it,
The pores 9 themselves can have a pumping action, and the pumping action and the discharge pressure can be combined. According to the above-described implementation, since the oil supply hole which is always in communication with the crankshaft and the orbiting scroll is provided, forced lubrication can be performed in the sliding surface hermetically sealed space between the orbiting scroll and the fixed scroll, thus ensuring the oil supply. Therefore, it is possible to improve the lubrication of each sliding surface to significantly reduce frictional damage and prevent seizure. According to the present invention, since the outer peripheral surface of at least one of the fixed scroll and the frame is closely bonded to the inner wall of the hermetically sealed container, the diameter of the hermetically sealed container can be suppressed to be small. In addition to downsizing and weight reduction as a whole, special members (flange, mounting bolts) etc. are not required when connecting to a closed container, thus suppressing increase in the number of parts and improving productivity and low It is possible to reduce the price. Further, a discharge chamber having a relatively wide gas area covered with a closed container is formed on the side opposite to the wrap of the fixed scroll end plate, and a gas compressed from a discharge port provided at the center of the fixed scroll is the discharge chamber. Since the refrigerant gas is once discharged to the outside of the hermetically sealed container, the refrigerant gas is once discharged to the discharge chamber in the space that is a relatively wide gas region, so that the gas flow velocity is significantly reduced. At the same time, the pressure pulsation width of the discharge pressure can be greatly reduced, and at the same time, the oil in the refrigerant gas can be efficiently separated by this discharge chamber.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view of an embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a view showing another embodiment of the oil supply passage provided in the orbiting scroll. FIG. 4 is a view showing still another embodiment of the oil supply passage. [Explanation of Codes] 1 ... Airtight container 2 ... Fixed scroll 3 ... Orbiting scroll 4 ... Frame 5 ... Rotation blocking member 7 ... Crankshaft 8 ... Bearing 9 ... Oil supply hole 10 ... Oil supply passage 20 ... Discharge chamber 21 ... Communication flow Road 22 ... Motor room

Claims (1)

[Claim 1] A scroll compression element portion and an electric motor are connected and stored in a closed container via a main shaft, and the scroll compression element portion is meshed with a spiral wrap inside. Fixed scroll and orbiting scroll, a rotation preventing member for preventing rotation of the orbiting scroll from rotating, a frame to which the fixed scroll is coupled, a frame rotatably supported via a bearing, and connected to an electric motor. The fixed scroll is provided with a discharge port that opens in the center and a suction port that opens in the outer periphery, and gas is sucked from the suction port to move the sealed space formed by both scrolls to the center. In a hermetic scroll fluid device used as a refrigerant compressor for refrigeration and air-conditioning, in which the volume is reduced and the gas is compressed while the fixed scroll is used. At least one outer peripheral surface of the frame is closely bonded to the inner wall of the hermetically sealed container to form a discharge chamber having a relatively wide gas area covered by the hermetically sealed container on the side opposite to the wrap of the fixed scroll end plate. A hermetically sealed scroll fluid device, characterized in that a compressed gas is discharged from the discharge port provided in the central portion to the discharge chamber and then discharged to the outside of the sealed container.