JPH06341390A - Sealed type scroll fluid device - Google Patents

Abstract

PURPOSE:To reduce the gas flow speed in a discharge chamber and reduce the pulsation width of the discharge pressure by discharging the refrigerant gas having passed through a discharge port from the compression space of a stationary and a revolving scroll once to the discharge chamber having a wide space, and then exhausting it to outside of the sealed vessel. CONSTITUTION:A compressing element part and a motor part are accommodated in a sealed vessel 1. In the compressing element part, a stationary scroll 2 secured to a frame 4 meshes with a revolving scroll 3 (a-c), wherein the stationary scroll 2 is equipped with a discharge port 2d in the center and with a suction port 2c at the periphery. The sealed vessel 1 is divided into two segments 1a, 1b consisting of a cylinder and a cober. A space enclosed with the cover is partitioned on the counter-lap side of a stationary scroll end plate, and the discharge port 2d is located in this space. Thereby the refrigerant gas having passed through the discharge port 2d from the compressing space of the scrolls 2, 3 is discharged once to a discharge chamber 20 having a wide space.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic scroll compressor used as a refrigerant compressor for refrigeration or air conditioning or a helium liquefaction compressor. 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 the hermetic scroll compressor, in the above cited example, the refrigerant gas is discharged from the discharge port at the central portion of the fixed scroll which is the compression element portion of the scroll fluid device. Has a structure in which it is directly guided to the outside of the closed container and discharged. Therefore, there is a problem that the pressure pulsation of the discharge pressure is large and the vibration of the discharge pipe is promoted. In addition, the lubricating oil mixed in the scroll compression element portion is compressed together with the refrigerant gas and flows out to the outside of the discharge pipe side together with the refrigerant gas, which is a so-called oil outflow amount (outflow amount) to the outside of the compressor. You will have issues with excess. For this reason, when the amount of oil rises in the compressor, the lubricating oil is exhausted, causing poor lubrication in various parts of the compressor, thereby impairing the reliability of the compressor itself. In addition, there is a possibility that the cycle performance and the reliability of the cycle equipment may be deteriorated due to, for example, a decrease in heat transfer performance of the heat exchanger or an increase in pressure loss of piping in the entire refrigeration cycle. The present invention has been invented in view of the above problems, and it is intended to reduce the pressure pulsation of the discharge pressure, to reduce the vibration of the discharge pipe, and to reduce the lubricating oil circulating in the closed container. An object of the present invention is to provide a hermetic scroll compression device that efficiently separates oil and prevents oil from flowing out of the machine. In order to achieve the above object, the present invention provides a hermetic scroll fluid device according to the first aspect of the invention, wherein a hermetically sealed scroll fluid device is fixed in a hermetically sealed container as a scroll compression element portion. A scroll compressor having a scroll and an orbiting scroll, and an electric motor arranged with the scrolls engaged with each other, an oil sump is formed at the bottom of the closed container, and a frame for fixing the fixed scroll and an end plate of the orbiting scroll. And a rotation preventing member composed of an Oldham mechanism for preventing the rotation of the orbiting scroll from rotating and making an orbiting motion.The fixed scroll is provided with a discharge port opening at the center and a suction port opening at the outer periphery. Intake more gas, move it around the compression space formed by both scrolls to reduce the volume and compress the gas, and then compress the gas from the discharge port into a container. In a sealed scroll fluid device that discharges gas into the room and further discharges gas to the outside of the device through a discharge pipe, the inside of the sealed container is divided into a discharge chamber on the non-lap side of the fixed scroll and an electric motor chamber on the electric motor side by the frame. A flow path that divides the discharge chamber and the electric motor chamber is provided along the inner wall of the closed container at the outer edge of the frame, and a discharge pipe that discharges gas from the electric motor chamber side is provided. It is characterized in that the gas is discharged to the outside of the container. Also, in the hermetic scroll fluid device according to the second aspect of the invention, the hermetically sealed container is divided into a discharge chamber and an electric motor chamber by the frame under the same premise as in the first aspect of the invention. , A flow path that connects the discharge chamber and the electric motor chamber is provided along the inner wall of the closed container at the outer edge of the frame.
The discharge pipe is provided in the vicinity of the frame outer edge portion in the upper portion of the electric motor chamber, and is installed on the wall portion of the closed container that does not axially overlap with the communication channel, and discharges the compressed gas into the discharge chamber from the discharge port. The compressed gas in the discharge chamber is guided to the electric motor chamber in the vertical direction through the communication passage provided on the outer edge portion of the frame, and the gas is discharged to the outside of the device via the discharge pipe located above the electric motor chamber. It is characterized in that it is configured to discharge. As described above, the refrigerant gas once discharged from the compression space formed by both scrolls through the discharge port 2d into the discharge chamber 20 having a relatively large space is further stored in the frame 4. At the outer edge portion, the fluid flows in the communication channel 21 (21a, etc.) provided along the inner wall of the closed container 1, and moves to the electric motor chamber 22 having a large space again. In such a closed container, a communication flow path 21 that sandwiches two spaces and acts as a throttle
With the configuration provided with, there is an effect that the pressure pulsation width of the discharge pressure can be greatly reduced. 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. Further, due to the action of reducing the pressure pulsation width of the discharge pressure, vibration of the closed container itself is reduced, noise of the compressor can be reduced, and product quality can be improved. Explaining the oil separating action in the container, the refrigerant gas mixed with the lubricating oil discharged from the discharge port 2d has a discharge chamber 20 which is a relatively large space. Part of the lubricating oil mixed in the refrigerant gas is separated from the refrigerant gas by the effect of changing the direction of the gas flow and the effect of decreasing the gas velocity due to the collision with the inner wall surface of the closed container 1b above 2d. Further, the oil separated from the refrigerant gas flows vertically along the inner wall of the closed casing 1a on the side of the electric motor chamber 22 through the communication passage 21 at the outer edge of the frame, and is still contained in the compressed refrigerant gas. A part of the oil thus collected is accumulated at the bottom of the closed container 1 by increasing the downflow speed due to its own weight and the inertia of the gas flow. On the other hand, the flow of the compressed refrigerant gas is diverted in a horizontal direction around the electric motor, and the refrigerant gas collides with the electric motor, and the gas velocity also decreases. The lubricating oil is
Further, it is separated from the refrigerant gas, and the separated oil is further promoted to fall due to its own weight. Next, the horizontal gas flow is converted to an upward vertical direction, and the electric motor chamber 2
The gas is discharged to the outside of the device through the discharge pipe 13 located in the upper part of 2. In this case, part of the oil contained in the compressed refrigerant gas falls due to its own weight due to the decrease in gas flow velocity. In this way, the gas flow becomes approximately U-shaped and changes its direction several times, and the flow velocity decreases, so that the oil particles drop due to inertia and self-weight each time, thereby improving the oil separation efficiency of the container itself. With such a configuration, the oil is first separated in the discharge chamber 20 and then introduced into the electric motor chamber 22, and the secondary separation effect of the oil in the electric motor chamber having a wider space is obtained, thereby further separating the oil in the gas. Will get better. Since the flow of the refrigerant gas is the flow around the electric motor and the flow accompanied by the collision of the refrigerant gas and the electric motor, it is possible to effectively cool the electric motor 11 by the refrigerant gas and the separated oil. 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 solid scroll 2 comprises an end plate 2a and a wrap 2b standing upright on the end plate 2a. Further, the fixed scroll has an intake port 2c on the outer periphery thereof and a discharge port 2c.
d. 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. Each lap 2 of both scrolls 2 and 3
b and 3b are formed in an involute curve or a curve similar thereto. The fixed scroll 2 and the orbiting scroll 3 are meshed with each other with the wraps 2b and 3b facing each other. The frame 4 has a space for accommodating the orbiting scroll 3 and an automatic blocking member 5 described later,
It is connected to the outer peripheral portion of the fixed scroll 2 by several bolts (not shown), and the outer peripheral surface of the frame 4 is closely attached to the inner wall of the closed container 1. The outer peripheral surface of the fixed scroll 2 is closely fitted and joined to the inner wall of the closed container 1. The rear surface of the end plate 3a of the orbiting scroll 3 is supported by the frame 4, and the end plate 3a can move without being so far from the end plate 2a of the fixed scroll 2. The rotation preventing member 5 comprises a ring having grooves (not shown) on one surface and the other surface and an Oldham key fitted in each groove,
The above grooves are orthogonal to each other. One groove has a frame
The Oldham Key-6 fixed to M4 is fitted.
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 at a position separated from the axial center of the crankshaft 7 by a distance corresponding to a turning radius ε, and the crankpin 7a is fitted into the turning scroll boss 3c. Are engaged. 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. Oil filling hole 9
Is formed on the crankshaft 6 from its lower end surface to its head portion, and opens at the upper end surface of the crankpin portion. Incidentally, reference numeral 11 is an electric motor, and its stator is
It 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. In the closed container, a space is divided by the frame 4 into a discharge chamber 20 on the side opposite to the wrap side of the fixed scroll 2 and a motor chamber 22 on the side of the electric motor 11, and a flow path connecting the discharge chamber 20 and the electric motor chamber 22. 21 (21a, 21b, 21c, 21d, 21
e) is provided on the outer edge of the frame and along the inner wall of the closed container 1a. A discharge pipe 13 that discharges gas from the electric motor chamber 22 side is provided. The discharge pipe 13 is connected to the motor room 22.
Is installed on the wall portion of the hermetically sealed container 1a which is located above the frame 4 and near the outer edge of the frame 4 and does not axially overlap the communication passage 21. 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, is discharged from the discharge port 2d, and moves to the electric motor chamber 22 through the discharge chamber 20 and the communication flow passage 21. As described above, since the oil separated in the discharge chamber 20 is relatively oily (liquid), the motor chamber 22
The most amount of oil is mixed in the refrigerant gas when flowing into, and the gravity effect that acts on the oil by mixing the compressed gas downward in the electric motor chamber 22 can be effectively utilized for the oil separation action. As a result, oil is removed from the refrigerant gas, the amount of oil rise 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. The electric motor stator is closely attached to and joined to the inner wall of the closed container 1. Discharge pressure was used when oil was supplied to each sliding surface and the closed space V1, but 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 this pumping action and discharge pressure can be used together. According to each of the embodiments of the oil supply passage 10 described above, the oil supply hole that is in constant communication with the crankshaft and the orbiting scroll is provided, so that it is possible to perform forced oil supply to the sliding surface between the orbiting scroll and the fixed scroll and the sealed space. Refueling is reliable. Therefore, it is possible to improve the lubrication of each sliding surface to significantly reduce frictional damage and prevent seizure. Also, due to the hydraulic pressure acting on the axial gap of the crankshaft head,
The axial pressing force can be applied to the orbiting scroll, and the separation force due to the gas pressure in the compression chamber can be reduced, whereby the orbiting motion of the orbiting scroll can be stabilized. According to the present invention, the following effects can be obtained. (1) The pulsation width of the discharge pressure is reduced,
The vibration amplitude of the discharge pipe can be reduced and the pipe stress can be reduced. (2) Noise can be reduced and product quality can be improved. (3) Effective cooling of the electric motor can be achieved. (4) The two-stage oil separating action of the two chambers works to improve the oil separating performance of the closed container itself. The amount of oil accumulated in the bottom portion of the closed container is reduced, so that the oil is always secured in the closed container, and oil is reliably supplied to each sliding portion. Therefore, the reliability of the compressor is significantly improved.

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

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[Procedure amendment] [Date of submission] March 23, 1994 [Procedure Amendment 1] [Amendment target document name] Specification [Amendment target item name] Full text [Amendment method] Change [Amendment content] [Document name] Specification Book [Title of Invention] Sealed scroll fluid device [Claims] [1] A scroll compression element portion and a motor are arranged in a sealed container, in which the fixed scroll and the orbiting scroll wrap are engaged with each other. A frame for forming an oil sump at the bottom of the closed container to fix the fixed scroll.
A rotation preventing member composed of an Oldham mechanism for preventing rotation of the orbiting scroll and making an orbiting motion between the scroll and the orbiting scroll end plate, and the fixed scroll has a discharge port opening at the center and a suction opening at the outer periphery. A closed scroll fluid device that is provided with a mouth, sucks gas from the suction port, moves around the compression space formed by both scrolls to reduce the volume and compresses the gas, wherein the closed container is thin and cylindrical. Part and a cover on the side of the cylindrical part, forming a space covered by the cover on the opposite wrap side of the fixed scroll end plate, and the discharge port provided in the center of the fixed scroll is closed in the space. Then, the compressed scroll gas device is configured such that the compressed gas is once discharged into the space and then sent out of the closed container. [2] In a closed container, a scroll compression element portion formed by engaging the fixed scroll and the orbiting scroll with each wrap inside and an electric motor are arranged, and an oil sump is formed in the bottom portion of the closed container to form the fixed scroll. Frame to be fixed
A rotation preventing member composed of an Oldham mechanism for preventing rotation of the orbiting scroll and making an orbiting motion between the scroll and the orbiting scroll end plate, and the fixed scroll has a discharge port opening at the center and a suction opening at the outer periphery. In a hermetic scroll fluid device in which a gas is sucked in through a suction port and is moved around a compression space formed by both scrolls to reduce the volume and compress the gas, the inside of the hermetic container is filled with the flare. Is divided into a discharge chamber on the non-wrap side of the fixed scroll and an electric motor chamber on the electric motor side by a frame, and a flow path that connects the discharge chamber and the electric motor chamber is provided along the inner wall of the closed container at the outer edge of the frame. A sealed scroll fluid device characterized in that a discharge pipe for discharging gas from the electric motor chamber side is provided, and the gas is discharged to the outside of the device via the discharge pipe. Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic scroll compressor 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 the hermetic scroll compressor, in the above cited example, the refrigerant gas is discharged from the discharge port at the central portion of the fixed scroll which is the compression element portion of the scroll fluid device. Has a structure in which it is directly guided to the outside of the closed container and discharged, so that the pressure pulsation of the discharge pressure is large, which promotes vibration of the discharge pipe, and there are problems such as cracks and noise in the pipe. The present invention has been invented in view of the above problems, and an object of the present invention is to reduce pressure pulsation of discharge pressure, reduce vibration of the discharge pipe, and prevent cracks in the discharge pipe. It is an object of the present invention to provide a hermetic scroll compressor that prevents the noise from occurring due to pressure pulsation, and improves the reliability of the compressor. In order to achieve the above-mentioned object, the present invention provides a hermetic scroll fluid device according to the first invention in which a fixed scroll and an orbiting scroll are provided in a hermetic container. A scroll compression element part, which is engaged with the wrap inside, is arranged with an electric motor, an oil sump is formed in the bottom part of the closed container, and the scroll is rotated between the frame fixing the fixed scroll and the orbiting scroll end plate. Equipped with a rotation blocking member consisting of an Oldham mechanism for blocking the rotation of the scroll and making a turning motion.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 sucks gas from the suction port. In the hermetic scroll fluid device that compresses gas by moving the compression space formed by both scrolls as a center to reduce the volume, The vessel is thin and consists of a cylindrical portion and a cover on the side of the cylindrical portion, and on the side opposite to the wrap of the fixed scroll end plate,
A space that is covered by the cover is formed, and a discharge port provided in the center of the fixed scroll is closed to the space, and the compressed gas is once discharged into the space and then sent out of the closed container. It is characterized by being done. Further, in the hermetically sealed scroll fluid device according to the second aspect of the invention as well, under the same premise as in the first aspect of the invention, the inside of the hermetically sealed container is discharged by the frame on the non-wrap side of the fixed scroll. And a motor chamber on the electric motor side, and a flow path that connects the discharge chamber and the electric motor chamber is provided along the inner wall of the hermetically sealed container at the frame outer edge to discharge gas from the electric motor chamber side. It is characterized in that a pipe is provided and the gas is discharged to the outside of the device through the discharge pipe. With the configuration of the first aspect of the invention described above, the refrigerant gas that has passed through the discharge port 2d from the compression space formed by both scrolls has a discharge chamber 20 in a space that once becomes a relatively wide gas region.
Since it is discharged to the
The pressure pulsation width of the discharge pressure can be greatly reduced.
In the configuration of the second aspect of the invention, the refrigerant gas that has passed through the discharge port 2d at the central portion of the fixed scroll is once discharged into the discharge chamber 20 having a relatively wide gas region, and the refrigerant discharged into the discharge chamber 20. The gas is further provided at the outer edge of the frame 4 along the inner wall of the hermetically sealed container 1 with a communication passage 21.
(21a, etc.) through, the motor room 2 of a wider space
It will move to 2. 2 in such a closed container
Due to the structure of the communication flow passage 21 that restricts the two spaces, the pressure pulsation of the discharge pressure can be reduced in two steps, and the pressure pulsation width of the discharge pressure can be significantly reduced. 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 is reduced,
It becomes possible to prevent a pipe crack accident. further,
Due to the action of reducing the pressure pulsation width of the discharge pressure, the vibration of the closed container itself is reduced, the noise of the compressor can be reduced, and the quality of the product can be improved. Further, since the pressure pulsation in the discharge pipe is reduced, it is possible to obtain the effect of suppressing the occurrence of vibration and noise even in the heat exchanger connected to the discharge pipe and preventing the same. 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. The end plate 3a of the orbiting scroll 3 has a back surface supported by the frame 4 so that the end plate 3a can move without being so 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 face 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 V ₁ , the oil supply hole 9 was opened at the lower end of the shaft center and the head was separated from the shaft center. If you open to
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 that is always in communication with the crankshaft and the orbiting scroll is provided, the sliding surface sealed space between the orbiting scroll and the fixed scroll can be forcibly oiled and the oil supply is ensured. 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, the following effects can be obtained. (1) The pulsation width of the discharge pressure is reduced,
The vibration amplitude of the discharge pipe is reduced and the pipe stress is reduced. (2) Due to the action of reducing the pressure pulsation width of the discharge pressure, the vibration of the closed container itself is reduced, the noise of the compressor is reduced, and the quality of the product is improved. (3) Since the pressure pulsation in the discharge pipe is reduced, it is possible to suppress the occurrence of vibration and noise even in the heat exchanger connected to the discharge pipe and to prevent it from occurring. . 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 compressor and an electric motor, which are fixed scrolls and orbiting scrolls that serve as scroll compression element portions and are engaged with each other with the scrolls inside, are arranged in the closed container, and the scroll is installed at the bottom of the closed container. An oil sump is formed between the frame for fixing the fixed scroll and the end plate of the orbiting scroll, and a rotation preventing member made of an Oldham mechanism for preventing rotation of the orbiting scroll and making an orbiting motion is provided. Has a discharge port that opens in the center and a suction port that opens in the outer periphery.It sucks gas through the suction port and moves it around the compression space formed by both scrolls to reduce the volume and compress the gas. In a sealed scroll fluid device that discharges compressed gas from the discharge port into the container chamber and further discharges the gas through the discharge pipe to the outside of the container, Is divided into a discharge chamber on the non-wrap side of the fixed scroll and an electric motor chamber on the electric motor side by a frame, and a flow path that connects the discharge chamber and the electric motor chamber is provided along the inner wall of the closed container at the outer edge of the frame. A sealed scroll fluid device characterized in that a discharge pipe for discharging gas from the electric motor chamber side is provided, and the gas is discharged to the outside of the device via the discharge pipe. [2] A scroll compressor in which a fixed scroll and a revolving scroll that are scroll compression element parts are provided in an airtight container, and both scrolls are inwardly meshed with each other, an electric motor is arranged in the upper part, and a scroll compressor is arranged in the lower part. An oil sump is formed in the fixed scroll, and a fixed rotation scroll is provided between the frame for fixing the fixed scroll and the end plate of the orbiting scroll, and a rotation prevention member formed of an Oldham mechanism for preventing rotation of the orbiting scroll and causing the orbital movement. Is equipped with a discharge port that opens in the center and an intake port that opens in the outer periphery.The gas is sucked through the suction port and moved around the compression space formed by both scrolls to reduce the volume and compress the gas. In the sealed scroll fluid device in which the compressed gas is discharged from the discharge port into the container chamber, and the gas is discharged to the outside of the container through the discharge pipe, -The discharge chamber and the electric motor chamber are divided by a frame, and a flow path that connects the discharge chamber and the electric motor chamber is provided along the inner wall of the closed container at the outer edge of the frame, and the discharge pipe is located above the electric motor chamber. In the vicinity of the outer edge of the frame, it is installed on the wall portion of the closed container that does not axially overlap with the communication channel,
The compressed gas is discharged into the discharge chamber from the discharge port, and the compressed gas in the discharge chamber is guided to the electric motor chamber in the vertical direction through the communication passage provided on the outer edge portion of the frame, and further the upper portion of the electric motor chamber. A hermetically sealed scroll fluid device characterized in that gas is discharged to the outside of the device via a discharge pipe located at.