JP2001020865A - Longitudinally installed hermetic compressor and muffler used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling performance and oil separation performance of an electric motor by regulating a flow of refrigerant and to improve reliability. SOLUTION: The discharge port 5 of a compressor mechanism 2 is opened to a first discharge space 11 separated away from a fourth discharge space 14 in the upper part of a closed container 1. A first communication passage 21 for lowering to cause the first discharge space 11 to communicate with a second discharge space 12 between the compression mechanism 2 and an electric motor 3 situated therebelow and a second communication passage 22 for lowering to cause the second discharge space 12 to communicate with a third discharge space 13 below the electric motor 3 are situated on an outer peripheral part on one side with the rotary axis 10 of the compression mechanism 2 and the electric motor 3 forming a boundary. A first communication passage 23 for rise to effect intercommunication between a third discharge space 13 and the second discharge space 12 and a second communication passage 24 for rise to effect intercommunication between the second discharge space 12 and a fourth discharge space 14 are situated on the outer peripheral part on the other side, opposite to one side, of the compression mechanism 2 and the electric motor 3. A flow of discharge fluid from the compression mechanism 2 is regulated to a lowering flow and a rise flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed vertical compressor mainly used for air-conditioning and refrigeration equipment, and more particularly to a compressor having a vertical rotation axis and a motor for driving the same on the same rotation axis. The present invention relates to a closed vertical compressor incorporated in a closed container and a muffler used therein.

[0002]

2. Description of the Related Art As electric compressors having a rotation axis, there are a rotary compressor and a scroll compressor having a compression section. Among them, scroll compressors have been widely put to practical use by utilizing the features of high efficiency, low noise, and low vibration.

[0003] The basic structure is well known,
There are many sliding parts in the compression mechanism, and it is essential to lubricate the compression mechanism, including ensuring the sealing performance. Therefore, contact between the refrigerant and the lubricating oil is inevitable, and the refrigerant accompanies the oil. When the oil accompanying the refrigerant is supplied to the refrigeration cycle together with the refrigerant, the refrigeration performance is reduced.

[0004] On the other hand, the refrigerant compressed by the compression mechanism is once discharged into an airtight container to be used for cooling the electric motor through a motor unit, and then discharged outside the airtight container to be supplied to a refrigeration cycle and returned. Is compressed again by the compression mechanism and discharged.

Japanese Patent Application Laid-Open No. 04-427789 discloses that in a closed vertical scroll compressor, oil accompanying a refrigerant is separated by utilizing a flow for cooling an electric motor by the discharged refrigerant. An example of a technique in which the liquid can be ejected to the outside without being accompanied is disclosed.

In this apparatus, a refrigerant discharged from a compression mechanism on the upper side of a closed container to a first discharge space above the compressor is passed between a compression mechanism and an electric motor below the compression mechanism through a frame communication passage on an outer peripheral portion of the compression mechanism. After being guided to the second discharge space between the motor and the third discharge space between the electric motor and the oil reservoir thereunder through one of the plurality of electric motor passages on the outer peripheral portion of the electric motor which mainly faces the frame communication passage. After the refrigerant that has reached the third discharge space is returned to the second discharge space mainly through the remaining electric motor passage, the refrigerant is discharged to the outside of the sealed container through the discharge port provided in the second discharge space. In this way, the oil accompanying the refrigerant can be returned to the lower oil sump while colliding and separating at various points on the way by the downward flow of the refrigerant, while the upward flow of the refrigerant tends to return to the lower part. A blown up so that not associated.

[0007] More specifically, a frame 1 facing the frame passage is provided.
The first main flow of the refrigerant that has entered the second discharge space from the frame passage flows into the third discharge space through the one motor passage because one motor passage has a larger flow path resistance than the other motor passages. On the other hand, the main flow of the refrigerant that has entered the third discharge space flows into the second discharge space from the remaining motor passage, which has a small flow path resistance and hardly allows the first main flow of the refrigerant to flow from the second discharge space. It returns smoothly to the outlet to the outside.

Also, a part of the refrigerant that enters the second discharge space from the first discharge space through the frame passage and collides with the upper surface of the electric motor forms a subflow and discharges to the outside in the second discharge space. Heading to the outlet, but by providing the discharge port to the outside on the side far from the frame passage, the sub-flow of the refrigerant does not immediately bypass the discharge port to the outside, but goes to the outside after passing through oil separation using a long distance. Discharge port.

[0009] Further, the generation of such a side flow causes the third
By reducing the amount of the refrigerant reaching the discharge port of the first and second or more motor paths having a large flow path resistance, it is attempted to return from the third discharge space to the second discharge space through these. The rising speed of the main flow of the refrigerant is suppressed, so that the rising refrigerant that returns to the oil through the remaining electric motor passage does not blow up.

[0010]

By the way, the refrigerant discharged from the compression mechanism can separate the accompanying oil by expansion and collision when discharged into a wide discharge space, or by centrifugal force when changing direction. .

However, according to the technique disclosed in the above publication, even the main flow of the refrigerant passes through only up to four spaces of the first to third discharge spaces and the second discharge space. Since only two first and second discharge spaces pass, the oil separation function is low. Moreover, in the technique disclosed in the above publication, the secondary flow of the refrigerant in the second discharge space is directed to a plurality of discharge passages to the outside of the second discharge space except for one motor passage through which the main flow of the descending refrigerant passes. Interfering with the ascending flow rising over a wide area through the motor passage, the power is attenuated, and the power is attenuated.The attenuation of the power makes the motor easily affected by the rotation of the rotor of the motor, and is disturbed. The oil which stays in the discharge space 2 for a long time and stays with the oil and the surrounding oil floats, and is easily discharged to the discharge port to the outside there. Also, the attenuation of the power of the refrigerant leads to a reduction in the energy of collision and contact around the electric motor,
Both the oil separation effect and the cooling performance of the motor are reduced. Therefore, both the reliability of the electric motor due to cooling and the reliability of the compression mechanism due to oil discharge are not yet sufficiently satisfactory.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hermetically sealed vertical compressor which restricts the flow of a refrigerant to improve the cooling performance and oil separation performance of an electric motor and has high reliability.

[0013]

Means for Solving the Problems To achieve the above object, a sealed vertical compressor of the present invention comprises a vertical compressor in which the outer periphery is closely fixed to the inner periphery of the closed container on the upper side of the closed container. A compression mechanism having a rotation axis oriented in the same direction, and an electric motor below which the outer periphery is fixed in close contact with the inner peripheral surface of the closed container and drives the compression mechanism to rotate on the same rotation axis as the lubricant A reservoir is provided, and the compression mechanism compresses the fluid sucked from the outside of the closed vessel to a high pressure, discharges the fluid into the closed vessel, and then discharges the outside of the closed vessel.The discharge port of the compression mechanism is above the compression mechanism. An opening is provided in a first discharge space isolated from a fourth discharge space having a discharge port to the outside in the upper portion of the closed container, and the first discharge space is provided between the compression mechanism in the closed container and the electric motor. A first descending communication passage communicating with the second discharge space of As its basic features in that a discharge space and the second rising communication passage for communicating the fourth discharge space.

The hermetically sealed vertical compressor of the present invention also includes:
A compression mechanism having a vertical rotation axis fixed to the inner periphery of the closed container with the outer periphery closely attached to the upper side of the sealed container, and the compression mechanism fixed to the inner periphery of the closed container with the outer periphery adhered below the compression mechanism. An electric motor that rotates and drives on the same rotation axis, a lubricant reservoir is provided in the lower part of the sealed container, and the compression mechanism compresses the fluid sucked from outside the sealed container to a high pressure and discharges it into the sealed container. From the container to the outside of the closed container,
The discharge port of the compression mechanism is opened on the compression mechanism to a first discharge space isolated from a fourth discharge space having a discharge port to the outside inside the upper part of the closed container, and the first discharge space is A first descending communication passage communicating with a second discharge space between the compression mechanism and the electric motor in the closed container, and the second discharge space,
A second descending communication passage communicating with a third discharge space below the motor in the closed container is provided on an outer peripheral portion on one side of the rotation axis of the compression mechanism and the motor, respectively. A first compression space communicating with the third discharge space and the second discharge space with the outer peripheral portion on the other side of the electric motor;
And a second ascending communication passage for communicating the second space with the fourth discharge space.

In this further feature configuration, the compression mechanism and the electric motor are positioned one above the other on the same vertical axis of rotation in the closed container, and the fluid compressed to high pressure by the compression mechanism first
After discharging into the first discharge space above the compression mechanism, it descends to the second discharge space between the compression mechanism and the electric motor, and to the third discharge space below the electric motor, and sequentially into these two discharge spaces. From the third discharge space to the second discharge space.
To a fourth discharge space having a discharge space, a compression mechanism, and a discharge port to the outside in the upper part of the closed container, and discharges the two discharge spaces sequentially, so that the fluid is compressed to a high pressure. Before the oil reaches the discharge port to the outside and supplies the other, it undergoes five times of separation due to expansion and collision at the time of discharge to the discharge space, so the number of times of mechanical separation of the lubricant is increased as compared with the conventional case. As a result, the performance of separating the lubricant is improved.

At the same time, the first and second descending communication passages and the first and second ascending communication passages are formed on one side and the other of the outer periphery of the compression mechanism and the electric motor with respect to the rotation axis. And a fluid flow descending from the first discharge space to the third discharge space via the second discharge space, and the fourth flow through the second discharge space from the third discharge space. The flow of the fluid rising into the discharge space can be regulated so as to form a large main flow separated on both sides of the rotation axis in the closed container, and most of the fluid compressed and discharged into the closed container in each of the aforementioned times By reducing the bypass for mechanical separation of the lubricant, the cooling effect due to collision or contact with the electric motor and the separation performance of the lubricant are both improved.

Also, since the descending flow and the rising flow of the fluid separated on both sides have little mutual influence, the first and second descending communication paths for guiding them are provided, and the first and second rising passages are provided. Acceleration from a high-pressure state and a straight-moving force given by the throttle action with the communication passage are hardly attenuated and hardly affected by the rotation of the rotor of the electric motor. The centrifugal force at the time of changing the direction from the upward flow to the upward flow is improved, which also improves the separation performance of the lubricant. At the same time, the power to cool the motor is also strong, so that the motor can be sufficiently cooled.

Accordingly, both the reliability of the electric motor by cooling and the reliability of the compression mechanism by reducing the discharge amount of the lubricant are improved, and a hermetic vertical compressor with high performance is realized. Moreover, it effectively utilizes the space that can be created inside the closed container,
There is an advantage that the apparatus is not particularly complicated or large, and does not cause an increase in cost.

On the other hand, even when the discharge fluid is handled only in the region above the electric motor in the closed container as in the configuration of the above-mentioned basic characteristics, the discharge fluid is applied to the first, second, and fourth discharge spaces. The number of times the lubricant is separated and the separation distance are increased as compared with the conventional case, and there is no bypass to the discharge port to the outside in the second discharge space. However, the reliability of the compression mechanism is improved and effective.

Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each of the features of the present invention can be used alone or in combination in various combinations wherever possible.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Representative embodiments of the present invention will be described below with reference to FIGS.

This embodiment is an example of a hermetic scroll compressor that is installed vertically for refrigeration and air conditioning.
Therefore, the fluid to be compressed is various kinds of refrigerant. However, the present invention is not limited to this, and may be used for applications other than refrigeration and air conditioning, and a compression mechanism such as a rotary compressor and an electric motor for driving the compression mechanism are vertically arranged on the same vertical rotation axis. The present invention is generally applied to a high-pressure hermetic vertical compressor that is provided in an airtight container.

FIG. 1 shows a scroll compressor according to this embodiment.
As shown in the configuration of each of the first to fourth embodiments of FIGS. 4, 6 and 8, the vertical direction in which the outer periphery is tightly fixed to the inner periphery of the closed container 1 on the upper side in the closed container 1 A compression mechanism 2 having a rotation axis 10 oriented in the same direction, and an electric motor 3 for rotating and driving the compression mechanism 2 having an outer periphery closely adhered to the inner peripheral surface of the sealed container 1 on the same rotation axis 10 under the compression mechanism 2. A lubricant reservoir 4 for storing oil as a lubricant is provided, and a compression mechanism 2 compresses a fluid sucked from outside of the closed vessel 1 through a suction port 20 to a high pressure, discharges the fluid into the closed vessel 1, and then seals. Container 1
It has a basic structure for discharging to the outside, and the fluid to be compressed is, for example, various refrigerants used in a refrigeration cycle. The refrigerant is typically 20-30 kg / cm ² as an example, reaches about 60 Kg / cm ² in the high pressure state. Therefore, the closed container is handled as a pressure container.

In particular, the discharge port 5 of the compression mechanism 2
The first discharge space 11 is separated from the fourth discharge space 14 having the discharge port 6 to the outside in the closed container 1 on the upper side of the closed container 1. A first descending communication passage 21 which communicates with a second discharge space 12 between the compression mechanism 2 and the electric motor 3, and the second discharge space 12
To the third discharge space 13 below the electric motor 3 in the closed container 1.
And a second descending communication passage 22 provided on the outer periphery of the compression mechanism 2 and the electric motor 3 on one side of the rotation axis 10 of the electric motor 3, respectively. A third discharge space 13 is provided on the outer peripheral portion on the other side.
A first ascending communication passage 23 for communicating the second discharge space 12 with the second discharge space 12, the second discharge space 12 and the fourth discharge space 14
And a second ascending communication passage 24 that communicates with the second embodiment is a basic feature common to the embodiments.

According to such a feature, the compression mechanism 2 and the electric motor 3 are connected to the same vertical rotation axis 1 in the closed casing 1.
The refrigerant, which is located above and below the compression mechanism 2 and has been compressed to a high pressure by the compression mechanism 2, is first discharged into the first discharge space 11 above the compression mechanism 2 from the discharge port 5 on the upper surface. The second discharge space 12 between the first discharge space 12 and the third discharge space 13 below the electric motor 3 is discharged to the two discharge spaces 12 and 13 sequentially, and then the third discharge space 1
3 to a second discharge space 12, a fourth discharge space 14 having a compression mechanism 2 and a discharge port 6 to the outside in the upper part of the closed container 1.
And the liquid is sequentially discharged into the two discharge spaces 12 and 14. Thereby, the refrigerant compressed to a high pressure circulates in the closed container 1 as shown by an arrow in FIG.
From the time of compression and discharge to the time when the oil reaches the discharge port 6 to the outside and supplies it to the other, it undergoes expansion and collision at the time of discharge into each of the discharge spaces 11 to 14 five times. The number of times of mechanical separation is increased as compared with the conventional one, and the separating performance of the oil 17 is improved accordingly.

At the same time, the first and second descending communication paths 2
1, 22 and the first and second ascending communication passages 23, 24
Is the rotation axis 10 of the outer periphery of the compression mechanism 2 and the electric motor 3.
The flow A of the refrigerant, which is distributed and located on one side and the other side with respect to, and descends from the first discharge space 11 through the second discharge space 12 to the third discharge space 13, 3
The flow B of the refrigerant rising from the discharge space 13 to the fourth discharge space 14 via the second discharge space 12 is formed into a large main flow separated on both sides of the closed axis 1 with the rotation axis 10 as a boundary. This allows most of the refrigerant compressed and discharged into the closed container 1 to be controlled by the oil 1
By reducing the bypass for the mechanical separation of the motor 7, the cooling effect due to collision or contact with the electric motor 3 and the separating performance of the oil 17 are improved as compared with the conventional case.

Further, since the downstream flow A and the upward flow B of the refrigerant separated on both sides have little influence on each other, the first and second downward communication paths 21 and 22 for guiding them are provided with the first and second downward communication paths 21 and 22.
Acceleration from a high pressure state provided by the throttle action with the second ascending communication passages 23 and 24, and the force of straight traveling are hardly attenuated, and the rotation of the rotor 3b of the electric motor 3 is hardly affected. While trying to flow between the rotor 3a and the rotor 3b, the collision energy in the mechanical separation of the oil 17 and the centrifugal force when changing the direction from the downflow A to the upflow B are improved. The separation performance of the oil 17 is improved as compared with the conventional case. At the same time, the power for cooling the electric motor 3 becomes vigorous, so that the electric motor 3 can be sufficiently cooled.

Therefore, the reliability of the electric motor 3 due to cooling and the reliability of the compression mechanism due to reduction of the discharge amount of the oil 17 are both improved, and a high-performance hermetic vertical compressor is realized. In addition, since the space created in the sealed container is effectively used, there is an advantage that the apparatus is not particularly complicated or large and does not cause an increase in cost.

Between the third discharge space 13 and the lubricant reservoir 4, the outer periphery is closely fitted to the inner periphery of the sealed container 1 by shrink fitting or the like,
An auxiliary bearing plate 16 as a bearing member on the lower end side of the electric motor 3 fixed by the welding joint 15 is located. Thus, when the downward flow A of the refrigerant is discharged into the third discharge space 13 and changes direction to become the upward flow B, the refrigerant contacts the oil 17 in the lubricant reservoir 4 and accompanies it. Since this is forcibly prevented, it is not necessary to take an extra space for preventing such a contact, which contributes to downsizing of the whole.
Moreover, the downward flow A discharged into the third discharge space 13 collides vigorously with the auxiliary bearing plate 16, so that the oil separation effect can be further enhanced.

In addition, a return path 18 for the oil 17 is provided at the lowest part of the auxiliary bearing plate 16 to communicate laterally to the lubricant reservoir 4. As a result, the oil 17 separated from the refrigerant and returning to the lower portion is once received by the auxiliary bearing plate 16, but is returned to the return path 1.
8 and the return path 18 is horizontal, so that the descending flow A is generated by the auxiliary bearing plate 1.
It is possible to prevent the lubricant 17 from leaking into the lubricant reservoir 4 and coming into contact with the oil 17 when it collides with the oil 6.

The compression mechanism 2 is a scroll compressor,
As shown in FIG. 1, spiral blades 31 of substantially the same shape
a, 32a are engaged with a fixed scroll 31 and an orbiting scroll 32 having one surface of end plates 31b, 32b,
A compression chamber 33 is formed between the two, and the orbiting scroll 32 is caused to make a circular orbital movement with respect to the fixed scroll 31 to repeatedly perform suction, compression and discharge of the refrigerant. Due to such a structure, the compression mechanism 2 has many internal sliding parts, and it is necessary to supply oil 17 to each of these parts, and the refrigerant is inevitably in contact with the oil 17 and tends to accompany the oil. Therefore, it is particularly effective to apply the present invention.

Further, in each of the first to fourth embodiments, the compression mechanism 2 uses a bearing 36 to bear a main shaft 34a on the upper end side of a crankshaft 34 that drives the orbiting scroll 32 directly connected to the electric motor 3, and the orbiting scroll 32 The outer periphery of the main bearing member 35 is tightly fixed to the inner periphery of the closed container 1 by shrink-fitting the outer periphery of the main bearing member 35 to the inner periphery of the closed container 1. The fixed scroll 31 is fixed to the upper surface of the main bearing member 35 by bolting the outer peripheral portion. The orbiting scroll 32 is located between the main bearing member 35 and the fixed scroll 31 and has a rotation preventing mechanism 37 such as an Oldham ring between its downward facing rear surface and the upper surface of the main bearing member 35, Annular wall 3
8 are provided. The annular wall 38 is provided integrally with the main bearing member 35. However, the specific configuration and the structure of the close contact with the inner periphery of the sealed container 1 may be designed in any manner.

In the electric motor 3, the stator 3a is a closed container 1
Is shrink-fitted to the inner circumference of the
The rotor 3b corresponding to the stator 3a has the crankshaft 3
4 are connected. The crankshaft 34 includes, for example, an eccentric shaft 34b provided on a main shaft 34a on the side of the compression mechanism 2 and a passive unit 3 provided substantially at the center of the rear surface of the orbiting scroll 32.
9 through a bearing 41, and the crankshaft 34 is rotationally driven by the electric motor 3 so that the eccentric shaft 34 b
The orbiting scroll 32, which is prevented from rotating by the eccentric rotation, orbits so as to make a circular orbital movement, and performs suction, compression and discharge of the refrigerant. Sub shaft 3 at the lower end of crank shaft 34
4c is supported on the auxiliary bearing plate 16 by a bearing 46. However, the bearing structure at this lower end can be omitted in some cases.

An oil passage 43 extends vertically through the crankshaft 34 to supply the oil 17 to various parts. The oil passage 43 has a lower end facing the lubricant reservoir 4, an upper end extending from each bearing portion on the main shaft 34 a side to each sliding portion in the compression mechanism 2, and a pressure setting such that the upper end side is lower in pressure than the lower end side. The oil 17 in the lubricant reservoir 4 is sucked up through the oil passage 43 and supplied to each sliding portion for lubrication. However, oil 17 is supplied from crankshaft 3
4 can be forcibly performed by a trochoid pump or the like. The bearing 46 of the sub-shaft 34c is lubricated by the oil 17 returning to the lower portion dripping or falling down, or by spraying the oil 17 with a refrigerant.

The first and second descending communication passages 21 and 22, and the first and second ascending communication passages 23 and 24 are provided with a total opening area and flow path resistance, and a downflow A and an upflow of the main flow. B spread area and flow velocity, pressure, each part is separated from the refrigerant first,
Various sizes, shapes, structures, and the like, which can afford not to blow up the oil 17 that is going to flow down through the second descending communication passages 21 and 22 and the first and second ascending communication passages 23 and 24. The number may be one, two, or more.

In the first embodiment shown in FIGS. 1 to 3, three first descending communication paths 21 are provided, one of which is located at one side of the rotation axis 10 in the closed vessel 1 and at the center. And the other two are evenly distributed to the left and right.
One of the lower communication passages 22 is provided at the center of the one side,
One of the ascending communication passages 23 is equally distributed in the center on the other side opposite to the rotation axis 10 and the second ascending communication passage 24 is equally distributed on the other side. by this,
The function and effect of the above main features were able to be exhibited.

Further, the first descending communication passage 21 is a hole provided on the outer periphery of the compression mechanism 2, for example, on the outer periphery of the fixed scroll 31 and the outer periphery of the main bearing member 35. The ascending communication path 23 is the stator 3a of the electric motor 3.
The outer periphery of the closed container 1 is formed by notching the outer periphery of the fixed scroll 31 and the main bearing member 35. It is formed between the inner peripheral surface. However, the specific arrangement can be variously changed.

The first discharge space 11 is formed between the upper surface of the fixed scroll 31 in which the discharge port 5 of the compression mechanism 2 is open and the muffler 42 fixed to the upper surface by bolting or the like. The first discharge space 11 having a size and shape advantageous for the expansion and collision separation of the refrigerant can be designed with a high degree of freedom, and the high-pressure refrigerant discharged from the discharge port 5 directly collides with the peripheral wall of the sealed container 1. Thus, an increase in noise due to the pulsation of the refrigerant being transmitted to the peripheral wall of the closed casing 1 and an increase in noise due to the peripheral wall of the closed casing 1 vibrating due to the collision of the refrigerant are eliminated.

The muffler 42 is made of a metal plate as shown in FIGS. 1 and 3, and a lead pressing piece 42b as shown in FIG. 3 is cut into an annular mounting seat 42a which is bolted to the compression mechanism 2 on the outer periphery. Raised and provided in the second discharge space 1
The lead wire 47 of the electric motor 3 drawn out from the second discharge space 14 to the fourth discharge space 14 is held on the compression mechanism 2 side by a lead pressing piece 42b. That is, the closed container 1 is connected to the compression mechanism 2 and the muffler 42 along the outer surface. To a terminal 44 for connection between the electric motor 3 provided in the upper part of the motor and the outside. Thus, the lead wire 47 touches the final welded joint 45 between the body 1a of the sealed container 1 and the end plate 1b in a narrow space between the electric motor 3, the compression mechanism 2, and the muffler 42, By being located very close, inconveniences such as burning out due to the effect of welding heat in the welding and joining operation can be avoided without special members.

The lead wire 47 is drawn from the second discharge space 12 to the fourth discharge space 14 through one of a pair of second ascending communication passages 24. The passage 24 is kept alive as a refrigerant passage without being blocked. However, this is free and may be killed as a refrigerant passage, or the second ascending communication passage 24 can be expanded more than the other by the integral of the cross section of the lead wire 47. In any case, it is necessary to provide a notch in the mounting seat 42a of the muffler 42 corresponding to a passage such as the second ascending communication passage 24 through which the lead wire 47 passes. Raising may be performed instead of processing for forming the notch.

The first descending communication passage 21 is a hole formed near the outer periphery of the compression mechanism 2, in this embodiment, near the outer periphery of the fixed scroll 31 and the main bearing member 35 as described above. The first descending communication passage 21 is provided in FIG.
As shown in the figure, the first discharge space 11 is provided on the upper surface where the discharge port 5 of the compression mechanism 2 is open, and is eccentric to the rotation axis 10 with respect to the first descending communication path 21 via the engraved portion 21a. It is trying to communicate with.

The engraved portion 21a may be formed at the same time when the fixed scroll 31 is die-cast, or may be formed by a suitable post-processing such as a counterbore processing or a drilling. Thus, the passage allowing the fluid to smoothly flow from the first discharge space 11 to the first descending communication passage 21 through the large engraved portion 21a does not increase the outer shape of the compression mechanism 2 and takes time and effort. It can be easily formed without or with simple post-processing.

In the second embodiment shown in FIGS. 4 and 5, the second discharge passage 11 is provided from the first discharge space 11 through the first descending communication passage 21.
Introduced into the discharge space 12 of the motor 3
The rotation is given under the influence of the rotation of the oil 17 and the oil 17 responds to the same behavior. As shown in FIGS. 4 and 5, a first descending communication passage 21 on one side of the rotation axis 10 is connected to a second ascending communication passage 24 on the other side. Is provided on the downstream side in the rotational direction of the rotor 3b of the electric motor 3.

As a result, the first discharge space 12
The distance in the rotation direction of the rotor 3b from the discharge position through the descending communication passage 21 to the second ascending communication passage 24 becomes longer. Therefore, the refrigerant is swirled by the second discharge space 1.
2, the amount of the refrigerant guided to the third discharge space 13 is increased without reaching the second ascending communication passage 24 and bypassing to the fourth discharge space 14, thereby increasing the separation rate of the oil 17. However, even if there is a refrigerant that bypasses from the second discharge space 12 to the fourth discharge space 14, the oil 17 due to expansion or collision due to the longer distance in the second discharge space 12.
Can also be increased. However, the distance from the first descending communication passage 21 to the second ascending communication passage 24 on the upstream side in the rotation direction of the rotor 3b is equal to the distance from the first descending communication passage 21 to the second ascending communication passage. The limit is that the phenomenon that the rotor 3b is bypassed upstream in the rotation direction of the rotor 3b does not occur. This limit is empirically determined by the relationship between the rotation speed of the rotor 3b, the pressure and flow rate of the refrigerant, and the like.
Further, if such an effect is within the above-mentioned limit, the first effect is obtained.
The longer the distance in the rotational direction of the rotor 3b from the lowering communication path 21 to the second ascending communication path 24 is, the more advantageous it is, the more advantageous it is. It is effective to reduce the number on the other hand,
It is preferable to use one by one.

The discharge port 6 to the outside of the closed container 1 is shown in FIGS.
As shown in the figure, the second ascending communication passage 24 and the rotation axis 1
It is located on the opposite side from zero. Accordingly, the distance required for the refrigerant guided to the fourth discharge space 14 through the second ascending communication passage 24 to reach the discharge port 6 is increased, and the distance in the fourth discharge space 14 is increased by the longer distance. The separation rate of the oil 17 due to expansion or collision can be increased, and the oil separation function can be further improved if the oil is designed to collide with the muffler 42.

Further, the second embodiment shown in FIGS. 4 and 5 is different from the second embodiment in that the fluid path from the second ascending communication passage 24 to the discharge port 6 to the outside of the closed casing 1 in the fourth discharge space 14 is described. A terminal 44 for connection to the outside of the electric motor 3 is located on the way. Thereby, the refrigerant guided to the fourth discharge space 14 collides with the terminal 44 while being discharged from the discharge port 6 to the outside of the closed container 1, so that the oil is efficiently separated by the oil. Is improved.

Since the other structure and the function and effect to be provided are not particularly different from those of the first embodiment, the same members are denoted by the same reference numerals, and overlapping description will be omitted.

In the third embodiment shown in FIGS. 6 and 7, the compression mechanism 2 projects from the lower surface of the compression mechanism 2 having a bearing portion 35a for bearing the motor 3 into the second discharge space 12, and the rotor 3b of the motor 3
A cylindrical cover 51 is provided to surround the turning area of the balance weight 52 from the periphery. The cover 51 has a flange 51 a at the upper end thereof fixed to the lower surface of the main bearing member 35 by bolting with a bolt 55. However, how to attach it is free.

Thus, the descending flow A of the refrigerant guided from the first descending communication passage 21 to the second discharge space 12
Is separated from the swirling area of the balance weight 52 of the rotor 3b in the discharge space 12 by the cover 51,
The main flow of the refrigerant is uniform without being disturbed by the balance weight 52 swirling at an offset position on the rotor 3b. As a result, the first descending communication passage 2
The refrigerant guided from the first to the second discharge space 12 is supplied to the electric motor 3
Can reliably collide with the upper end portion of the stator 3a and cool the portion reliably, and the oil separation effect by the collision is improved. Therefore, the reliability of the electric motor 3 can be improved by cooling, and the reliability of the compressor can be improved by reducing the oil discharge amount.

Since the other structure and the function and effect to be achieved are not particularly different from those of the first embodiment, the same members are denoted by the same reference numerals, and overlapping description will be omitted.

In the fourth embodiment shown in FIGS. 8 to 10, in addition to the third embodiment shown in FIGS. 6 and 7, the compression mechanism 2 has a second lower surface having a bearing for bearing the electric motor 3. Partitioning the second discharge space 12 into first and second descending communication paths 21 and 22 and first and second ascending communication paths 23 and 24. A plate 53 is provided.
As a result, both the flow of the descending flow A and the flow of the ascending flow B of the refrigerant further reduce the influence of both of them and the effect of the rotation of the rotor 3b of the electric motor 3, so that the flow of the refrigerant in any part is uniform. It is possible to prevent oil blow-up while further enhancing the oil separation effect due to collision. It is effective to omit the cover 51 of the third embodiment and provide only the partition plate 53.

Since the other structure and the function and effect to be achieved are not particularly different from those of the first embodiment, the same members are denoted by the same reference numerals, and redundant description will be omitted.

In each of the first and second embodiments, the compression mechanism 2 having a vertical rotation axis 10 having an outer periphery closely fixed to the inner periphery of the hermetically sealed container 1 above the hermetically sealed container 1. An electric motor 3 under which the outer periphery is fixed in close contact with the inner peripheral surface of the sealed container 1 and which drives the compression mechanism 2 to rotate on the same rotation axis 10 as the lubricant reservoir 4 in the lower portion of the sealed container 1
The compression mechanism 2 compresses the fluid sucked from outside the closed vessel 1 to a high pressure, discharges the fluid into the closed vessel 1, and then discharges the fluid outside the closed vessel 1. The first discharge space 11 is opened on the compression mechanism 2 into a first discharge space 11 isolated from a fourth discharge space 14 having a discharge port 6 to the outside inside the upper part of the closed container 1.
Between the compression mechanism 2 and the electric motor 3 in the closed container 1.
First descending communication passage 21 communicating with the discharge space 12
And a second ascending communication path 24 for communicating the second discharge space 12 and the fourth discharge space 14 as a basic configuration. The discharged refrigerant can be handled only in the region above the electric motor 3.

Also in this case, since the discharged refrigerant sequentially passes through the first, second and fourth discharge spaces 11, 12, and 14, the number of times of separation of the lubricant and the separation distance are increased as compared with the conventional case.
Since there is no bypass in the second discharge space 12 to the discharge port 6 to the outside, the discharge amount of the lubricant is also reduced, the reliability of the compression mechanism 2 is improved, and the compression mechanism 2 is more effective than before.

[0055]

According to the present invention, as is apparent from the above description, the expansion at the time of discharge into the discharge space until the fluid compressed to high pressure reaches the discharge port to the outside and supplies it to the other. ,
The number of times of mechanical separation of the lubricant increases as compared with the related art since the separation by the collision is performed five times, and at the same time, the fluid that descends from the first discharge space to the third discharge space via the second discharge space. The flow and the flow of the fluid ascending from the third discharge space to the fourth discharge space via the second discharge space are well regulated to provide the mechanical separation of the lubricant each time without bypass, and to reduce the lubricant. Improves collision energy in mechanical separation and centrifugal force when changing direction from downflow to upflow,
In addition, the power at which the refrigerant collides with and contacts the motor is also improved, so the cooling performance of the motor is high and its reliability is improved, and the separation performance of lubricant is high and the reliability of the compressor is also improved by reducing the amount of lubricant discharged. I do. In addition, since a certain space in the sealed container is effectively used, there is an advantage that the device is not particularly complicated or large.

[Brief description of the drawings]

FIG. 1 is an overall longitudinal sectional view of a hermetic vertical compressor showing a first embodiment according to an embodiment of the present invention.

FIG. 2 is a transverse cross-sectional view of a first discharge space of the compressor of FIG.

FIG. 3 is a perspective view of a muffler of the compressor of FIG.

FIG. 4 is an overall vertical sectional view of a hermetic vertical compressor showing a second example according to the embodiment of the present invention.

FIG. 5 is a plan view of the compressor of FIG.

FIG. 6 is an overall longitudinal sectional view of a hermetic vertical compressor showing a third example according to an embodiment of the present invention.

FIG. 7 is a perspective view of a cover of the compressor of FIG. 6;

FIG. 8 is an overall vertical cross-sectional view of a hermetically sealed vertical compressor showing a fourth example according to an embodiment of the present invention.

FIG. 9 is a cross-sectional view of a first discharge space of the compressor shown in FIG. 8;

FIG. 10 is a perspective view of a cover and a partition plate of the compressor of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism 3 Electric motor 5 Discharge port 6 Discharge port to the outside 10 Rotation axis 11 First discharge space 12 Second discharge space 13 Third discharge space 14 Fourth discharge space 16 Sub bearing plate 20 Suction Port 21 First descending communication path 22 Second descending communication path 23 First ascending communication path 24 Second ascending communication path 31 Fixed scroll 32 Orbiting scroll 31a, 32a Blade 31b, 32b End plate 34 Crankshaft 35 Main bearing member 35a Bearing part 42 Muffler 42a Mounting seat 42b Lead holding piece 44 Terminal 51 Cover 52 Balance weight 53 Partition plate

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F04C 29/02 361 F04C 29/02 361A (72) Inventor Takashi Morimoto 1006 Odakadoma, Kadoma City, Osaka Prefecture Matsushita Electric Inside Sangyo Co., Ltd. (72) Inventor Hiroyuki Kono 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiromasa Ashiya 1006 Oji Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Person Shuichi Yamamoto 1006 Kadoma, Kazuma, Kazuma, Osaka, Japan Matsushita Electric Industrial Co., Ltd. (72) Inventor Kiyoshi Kiyoshi 1006 Kadoma, Kazuma, Kazuma, Osaka Pref. 3H029 AA02 AA14 AA21 AB03 BB03 BB05 BB12 BB35 CC07 CC09 CC25 CC44 3H039 AA03 AA04 AA12 BB13 BB16 CC29 CC32 CC3 3 CC34

Claims (16)

[Claims] 1. A compression mechanism having a vertical rotation axis fixed to the inner periphery of the closed container in close contact with the inner periphery of the closed container on the upper side of the closed container, and the outer periphery of the compression mechanism is fixed to the inner circumferential surface of the closed container below the compression mechanism. An electric motor that is fixed to the compressor and drives the compression mechanism to rotate on the same axis of rotation, a lubricant reservoir is provided in the lower part of the sealed container, and the compression mechanism compresses the fluid sucked from outside the sealed container to a high pressure to seal the sealed container. In a closed vertical compressor which discharges into a sealed container and then discharges out of the closed container, a discharge port of the compression mechanism has a discharge port on the compression mechanism to the outside in the upper part of the closed container. A first descending communication path that opens to a first discharge space isolated from the first discharge space and communicates the first discharge space with a second discharge space between the compression mechanism and the electric motor in the closed container; A second ascending link for communicating the second discharge space with the fourth discharge space. Hermetic vertical compressor which is characterized in that a and road. 2. A compression mechanism having a vertical rotation axis fixed on the inner periphery of the closed container in close contact with the inner periphery of the closed container on the upper side of the closed container, and the outer periphery of the compression mechanism is fixed on the inner circumferential surface of the closed container below. An electric motor that is fixed to the compressor and drives the compression mechanism to rotate on the same axis of rotation, a lubricant reservoir is provided in the lower part of the sealed container, and the compression mechanism compresses the fluid sucked from outside the sealed container to a high pressure to seal the sealed container. In a closed vertical compressor which discharges into a sealed container and then discharges out of the closed container, a discharge port of the compression mechanism has a discharge port on the compression mechanism to the outside in the upper part of the closed container. A first descending communication path that opens to a first discharge space isolated from the first discharge space and communicates the first discharge space with a second discharge space between the compression mechanism and the electric motor in the closed container; The second discharge space,
A second descending communication passage communicating with a third discharge space below the motor in the closed container is provided on an outer peripheral portion on one side of the rotation axis of the compression mechanism and the motor, respectively. A first compression space communicating with the third discharge space and the second discharge space with the outer peripheral portion on the other side of the electric motor;
And a second ascending communication passage for communicating the second space with the fourth discharge space. 3. The hermetic-type hermetic seal according to claim 2, wherein a bearing member of the electric motor whose outer periphery is closely fixed to the inner periphery of the sealed container is located between the third discharge space and the lubricant reservoir. Vertical compressor. 4. The hermetic vertical compressor according to claim 2, wherein a return path for the lubricant is provided at the lowest part of the bearing member to laterally communicate with the lubricant reservoir. 5. A compression mechanism includes: a fixed scroll having spiral blades having substantially the same shape on one surface of a head plate and a revolving scroll; a compression chamber formed between the two; and the revolving scroll becomes a fixed scroll. The hermetic vertical compressor according to any one of claims 1 and 2, wherein the compressor is a scroll compressor that performs a circular orbital motion to repeatedly suck, compress, and discharge a fluid. 6. A first ascending communication path on one side of the rotation axis, and a second ascending communication path on the other side, the rotor of the electric motor on the other side. The hermetic vertical compressor according to any one of claims 1 and 2, wherein the hermetic compressor is positioned closer to the downstream side in the rotational direction of the compressor. 7. The discharge port according to claim 1, wherein the discharge port to the outside of the closed container is located on a side opposite to the second ascending communication path and the rotation axis. Closed vertical compressor. 8. The terminal according to claim 1, wherein a terminal for connection to the outside of the electric motor is located in the fluid path from the second ascending communication passage to the discharge port to the outside of the closed vessel. The vertical compressor of the closed type described in the paragraph. 9. A cylindrical cover which projects from a lower surface having a bearing portion for bearing an electric motor of a compression mechanism into a second discharge space and surrounds a turning area of a balance weight of a rotor of the electric motor from the periphery. The hermetic vertical compressor according to any one of claims 1 and 2, wherein: 10. A compression mechanism which projects from a lower surface having a bearing for bearing an electric motor of a compression mechanism into a second discharge space, and connects the second discharge space to the first and second descending communication passages with the first and second descending communication paths. 2. The hermetic vertical compressor according to claim 1, further comprising a partition plate provided on a side of the second ascending communication passage. 11. The hermetic seal according to claim 1, wherein the first discharge space is formed between an upper surface where the discharge port of the compression mechanism is opened and a muffler applied to the upper surface. Type vertical compressor. 12. The first descending communication passage is a hole formed near the outer peripheral portion of the compression mechanism, is provided on the upper surface where the discharge port of the compression mechanism is open, and is provided in the first descending communication passage. The hermetically sealed vertical compressor according to any one of claims 1 and 2, which communicates with the first discharge space via a carved portion eccentric to the rotation axis side. 13. The first descending communication passage is a hole provided in the compression mechanism, and the second ascending communication passage is constituted by a notch provided on an outer periphery of the compression mechanism and an inner surface of the closed container. Item 3. A sealed vertical compressor according to any one of Items 1 and 2. 14. The lead holding piece cut and raised on a mounting seat for a compression mechanism on the outer periphery of the muffler, and the cut and raised is provided at a position facing the second ascending communication path. The sealed vertical compressor according to claim 1. 15. The hermetic vertical compressor according to claim 1, wherein the second ascending communication passage also serves as a lead wire passage. 16. A muffler attached to a surface of a compression mechanism where a discharge port is opened and covering a fluid discharge area from the discharge port, wherein a lead presser piece is cut and raised on a mounting seat for a compression mechanism on an outer periphery. A muffler characterized by that.