WO2019044326A1

WO2019044326A1 - Compressor

Info

Publication number: WO2019044326A1
Application number: PCT/JP2018/028525
Authority: WO
Inventors: 大輔船越; 里　和哉; 努昆; 大典大城
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2017-09-04
Filing date: 2018-07-31
Publication date: 2019-03-07
Also published as: JP7117607B2; CN111033045A; JPWO2019044326A1

Abstract

A compressor (50) comprises a sealed container (1), a compression mechanism part (2) provided inside the sealed container (1), an electric motor part (3) that drives the compression mechanism part (2), and a pump (18) that supplies oil to the electric motor part (3). The compressor (50) also comprises an oil discharge pump (25) that is connected to the compression mechanism part (2) and that returns oil to a space below the electric motor part (3) inside the sealed container (1) after the oil has lubricated the compression mechanism part (2). An end part of the oil discharge pump (25) is secured to the sealed container (1).

Description

Compressor

The present disclosure relates to a cooling device such as a cooling and heating air conditioner and a refrigerator, and a compressor used for a heat pump water heater and the like.

Conventionally, a hermetic compressor used for a cooling device and a water heater etc. compresses the refrigerant gas returned from the refrigeration cycle by the compression mechanism section and feeds it to the refrigeration cycle. At that time, oil is supplied to the compression mechanism portion, the sliding portion is lubricated by the oil, and the oil after lubrication is returned to the oil storage portion (see, for example, Patent Document 1).

JP, 2012-207541, A

The present disclosure provides a compressor that suppresses noise generation associated with oil discharge from the compression mechanism, suppresses oil outflow to the refrigeration cycle, and reduces noise and oil spillage to the refrigeration cycle. It is a thing.

The compressor of the present disclosure is connected to a hermetic container, a compression mechanism unit provided in the hermetic container, a motor unit that drives the compression mechanism unit, a pump that supplies oil to the compression mechanism unit, and a compression mechanism unit And an oil discharge pipe for returning the oil after lubricating the compression mechanism portion to a space below the motor portion in the hermetic container. And the end of the oil discharge pipe is fixed to the closed container.

As a result, the oil released from the compression mechanism portion is discharged below the motor portion of the closed container via the oil discharge pipe. At that time, even if the oil discharged from the compression mechanism part is pulsating, the oil discharge pipe is fixed to the closed container, so it is possible to suppress the generation of noise due to the vibration of the oil discharge pipe. Can be

Furthermore, since the oil discharge pipe returns the oil to the space below the motor in the closed vessel, this oil can be prevented from being caught by the turbulent refrigerant generated in the space above the motor, and the oil flows out to the refrigeration cycle Oil can be reduced.

According to the present disclosure, it is possible to provide a compressor that is low in noise and low in oil spillage into the refrigeration cycle.

FIG. 1 is a side cross-sectional view of a compressor according to a first embodiment of the present disclosure. FIG. 2 is an enlarged sectional view showing an essential part of the same compressor. FIG. 3 is an enlarged cross-sectional view showing a configuration of a compressor of a comparative example.

(Findings underlying the present disclosure)
FIG. 3 is a cross-sectional view showing a compression mechanism portion of a scroll compressor of a comparative example, which has a configuration similar to that of Patent Document 1 described above.

The low-temperature low-pressure refrigerant gas is introduced to the suction chamber of the fixed scroll 102 through the suction pipe 101, and compressed by the volume change of the compression chamber 104 formed between the fixed scroll 102 and the orbiting scroll 103. It becomes high pressure. Thereafter, the high-temperature and high-pressure refrigerant gas is discharged into the muffler space 106 through the discharge port 105 at the upper part of the fixed scroll 102, and from the muffler space 106 through the inside of the closed container 107 to the refrigeration cycle from the discharge pipe 108. It is sent out.

At this time, a sliding portion of the compression mechanism including the fixed scroll 102 and the orbiting scroll 103, for example, a meshing portion between the stationary scroll 102 and the orbiting scroll 103, between the shaft 109 and its bearing member 110, and Oil is supplied to the back pressure chamber and the like to lubricate each sliding portion.

Oil for lubricating each sliding portion is supplied via an oil passage 112 in a shaft 109 for driving the orbiting scroll 103, and after lubricating each sliding portion of the compression mechanism portion, the oil provided on the bearing member 110 is exhausted. The oil is discharged into the closed container 107 below the compression mechanism via the oil passage 113. Then, the oil discharged into the sealed container 107 falls downward by gravity and is accumulated in an oil storage portion (not shown) provided at the lower part in the sealed container 107.

However, in the compressor having the configuration of FIG. 3, the high-pressure refrigerant gas discharged from the discharge port 105 of the fixed scroll 102 is in a turbulent state in the closed container 107. For this reason, the oil discharged from the oil discharge passage 113 of the bearing member 110 into the closed container 107 below the compression mechanism is partially mixed with the refrigerant gas on the way down and flows out from the discharge pipe 108 to the refrigeration cycle Resulting in.

Therefore, in the configuration of FIG. 3, an oil guide plate 114 along the inner wall surface of the closed container 107 is provided at the outlet portion of the oil discharge passage 113. The oil from the oil discharge passage 113 is released between the oil guide plate 114 and the inner wall surface of the sealed container 107.

Thus, the oil released from the oil discharge passage 113 can be prevented from being mixed with the turbulent flow refrigerant in the closed container 107 and flowing out to the refrigeration cycle.

However, the oil discharged from the oil discharge passage 113 is at high pressure, and is pulsating due to eccentric rotation of the orbiting scroll 103 and the shaft eccentric shaft 109a. For this reason, there is a problem that the oil guide plate 114 vibrates and emits noise.

Further, the oil guide plate 114 can be provided only up to the upper end portion of the coil portion of the motor 115 for driving the shaft 109. Therefore, below that, oil is dropped through the gap between the coil portion of the motor 115 and the inner wall surface of the closed vessel 107 or the like. Therefore, a part of the oil falling from between the lower end of the oil guide plate 114 and the inner wall surface of the sealed container 107 is caught in the turbulent flow of cold air generated in the upper space 116 of the motor 115 in the sealed container 107. Flow out into the refrigeration cycle. Therefore, according to the configuration of FIG. 3, although the oil spill to the refrigeration cycle is reduced, there is still room for improvement. The present disclosure is made based on such findings.

(An example of the aspect of this indication)
A compressor according to a first aspect of the present disclosure includes: an airtight container; a compression mechanism provided in the airtight container; a motor unit for driving the compression mechanism; a pump for supplying oil to the compression mechanism; The oil discharge pipe is connected to the mechanism unit and returns the oil after lubricating the compression mechanism unit to the space below the motor unit in the hermetic container. And the end of the oil discharge pipe is fixed to the closed container.

As a result, the oil released from the compression mechanism portion is discharged below the motor portion of the closed container via the oil discharge pipe. At that time, even if the oil discharged from the compression mechanism part is pulsating, since the oil discharge pipe is fixed to the closed container, it is possible to suppress the generation of noise due to the vibration of the oil discharge pipe, and low noise Can be

Furthermore, since the oil discharge pipe returns the oil to the space below the motor in the sealed container, it is possible to suppress the oil from being caught in the turbulent air flow of the refrigerant in the space above the motor, and to the refrigeration cycle It is possible to reduce the oil spilled.

The second aspect of the present disclosure may be configured such that the oil discharge pipe is fixed to the closed container by TIG welding.

Thereby, even if the oil discharge pipe is used for a long time, since it is firmly fixed and held in the closed container, it is possible to prevent the fixed part from becoming loose and starting to generate noise.

Furthermore, TIG welding hardly generates spatter at the time of welding as compared with other welding methods. Therefore, it is possible to prevent the spatter from adhering to the coil portion or the like of the motor portion and affecting the performance of the motor, and a highly reliable compressor can be realized.

The third aspect further comprises an oil reservoir provided in the sealed container, the oil discharge pipe having an opening, and the opening opens into the oil accumulated in the oil reservoir. It may be configured.

This, in turn, causes all of the oil flowing out of the oil discharge pipe to return to the oil. Therefore, it is also prevented that a part of the oil droplets, which are generated when the oil discharge pipe is opened above the oil surface, and which bounces back due to the collision of the oil with the oil surface, is caught in the turbulent air flow of the refrigerant and flows out to the refrigeration cycle It is possible to significantly reduce the outflow of oil to the refrigeration cycle.

In the fourth aspect, the motor unit may further include a shaft and a lower bearing member supporting the shaft, and a position at which the oil discharge pipe is fixed to the closed container may be below the lower bearing member.

As a result, the dimension from the position where the oil discharge pipe is fixed to the opening is further shortened, and vibration of the oil discharge pipe can be effectively suppressed from the fixing portion to the opening, thereby preventing noise It can be raised.

In the fifth aspect, the position for fixing the oil discharge pipe to the closed container may be an open edge located in the oil accumulated in the closed container.

As a result, there is no room for vibration generation starting from the fixed portion of the oil discharge pipe, and the noise prevention effect by the vibration suppression can be made more reliable.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the present disclosure is not limited by the embodiment.

First Embodiment
FIG. 1 is a cross-sectional view seen from the side of a compressor 50 according to a first embodiment of the present disclosure, and FIG. 2 is an enlarged cross-sectional view showing the main part of the compressor 50.

As shown in FIG. 1, the compressor 50 according to the present embodiment includes a sealed container 1, a compression mechanism 2 provided therein, and an electric motor 3.

The main bearing member 4 and the lower bearing member 4a are fixed in the sealed container 1 by welding, shrink fitting, or the like. The main bearing member 4 and the lower bearing member 4 a pivotally support the shaft 5.

A fixed scroll 6 is bolted onto the main bearing member 4. Between the fixed scroll 6 and the main bearing member 4, a orbiting scroll 7 engaged with the fixed scroll 6 is sandwiched, and a scroll-type compression mechanism unit 2 is configured.

Between the orbiting scroll 7 and the main bearing member 4, a rotation restraint mechanism 8 including an Oldham ring or the like is provided which guides the orbiting scroll 7 so that it orbits circularly while preventing the rotation of the orbiting scroll 7.

The eccentric scroll 5 is eccentrically driven by the eccentric shaft 5 a at the upper end of the shaft 5 to cause the orbiting scroll 7 to make a circular orbit motion. As a result, the compression chamber 9 formed between the fixed scroll 6 and the orbiting scroll 7 moves from the outer peripheral side toward the central portion while reducing the volume. Using this movement, the refrigerant gas is drawn from the suction pipe 10 leading to the refrigeration cycle outside the closed container 1 through the suction chamber 11 provided in the fixed scroll 6, and the refrigerant gas is confined in the compression chamber 9 After being compressed, it is compressed. The refrigerant gas that has reached the predetermined pressure is discharged from the discharge port 12 at the central portion of the fixed scroll 6 by pushing the reed valve 13 open.

The refrigerant gas discharged by pushing open the reed valve 13 is discharged into the muffler space 14, and the discharge pipe 17 passes through the in-container space 15 between the compression mechanism portion 2 and the motor portion 3 of the closed container 1. Are sent out to the refrigeration cycle.

On the other hand, a positive displacement oil pump 18 is provided at the lower end of the shaft 5 which drives the rotary scroll 7 to turn, and the suction port of the positive displacement oil pump 18 is arranged to be present in the oil of the oil reservoir 19 There is.

Since the displacement type oil pump 18 is driven simultaneously with the scroll compressor, the displacement type oil pump 18 operates the oil in the oil reservoir 19 provided at the bottom of the closed container 1 regardless of the pressure condition and the operating speed. It sucks up surely.

The oil sucked up by the positive displacement oil pump 18 is supplied to the compression mechanism portion 2 through an oil supply passage 20 passing through the inside of the shaft 5. Before or after the oil is sucked by the positive displacement oil pump 18, if foreign matter is removed from the oil by an oil filter or the like, the foreign matter can be prevented from being mixed into the compression mechanism portion 2 and reliability can be improved. it can.

The pressure of the oil introduced to the compression mechanism 2 is approximately equal to the discharge pressure of the scroll compressor, and also serves as a back pressure source for the orbiting scroll 7. As a result, the orbiting scroll 7 does not leave the fixed scroll 6 or collide with one another, and stably exerts a predetermined compression function.

Furthermore, a portion of the oil is a fitting portion between the eccentric shaft portion 5a and the orbiting scroll 7, a bearing portion 21 between the shaft 5 and the main bearing member 4 so as to obtain a relief by the supply pressure and self weight. 2) and lubricate the respective parts, and then return to the oil reservoir 19.

Another part of the oil supplied from the oil supply passage 20 to the high pressure area 22 is formed in the orbiting scroll 7 and passes through a path having one open end in the high pressure area 22 so that the rotation restraint mechanism 8 is positioned. Into the back pressure chamber 23 which is The oil that has infiltrated acts as a back pressure application to the orbiting scroll 7 in the back pressure chamber 23 as it lubricates the thrust sliding portion and the sliding portion of the rotation restraint mechanism 8.

The oil that has lubricated the compression mechanism 2 is returned to the oil reservoir 19 in the closed container 1. In the present embodiment, the oil discharge pipe 25 is connected to the oil discharge hole 24 provided in the main bearing member 4 of the compression mechanism 2, and the oil is stored in the oil reservoir 19 via the oil discharge pipe 25. Will be returned to

The oil discharge pipe 25 is bent in a substantially L-shape, and one end thereof is fitted and mounted to the oil discharge hole 24 of the main bearing member 4, and the other end is directed downward along the inner wall surface of the sealed container 1. , And is drawn to the lower side of the motor unit 3. The lower end of the oil discharge pipe 25 is fixed to the inner wall surface of the sealed container 1 at least at a fixed position 26 described later.

The fixed position 26 of the oil discharge pipe 25 is fixed by TIG welding in the present embodiment. The oil discharge pipe 25 is fixed by TIG welding with the edge of the opening 27 which is the lower end of the oil discharge pipe 25 as the fixed position 26.

Furthermore, in the present embodiment, the oil discharge pipe 25 is pulled out to the oil reservoir 19 in the closed container 1, and the opening 27 is located in the oil accumulated in the oil reservoir 19 in the closed container 1. Is configured.

The oil discharge pipe 25 is formed of an iron pipe, and is disposed using one of a plurality of notch gaps 3 a formed in the vertical direction on the outer periphery of the coil of the motor unit 3. ing. However, the present disclosure is not limited to this example, and the pipe material and the arrangement location are not limited to this.

Hereinafter, the operation and effects of the compressor 50 configured as described above will be described.

The refrigerant sucked from the suction pipe 10 is compressed by the compression chamber 9 formed by the fixed scroll 6 and the orbiting scroll 7, and the reed valve 13 is pushed open to be discharged into the closed container 1. The refrigerant discharged into the closed container 1 passes through the in-container space 15 between the compression mechanism unit 2 and the motor unit 3 and is delivered from the discharge pipe 17 to the refrigeration cycle.

On the other hand, each portion of the compression mechanism portion 2 for compressing the refrigerant, such as an engagement portion between the fixed scroll 6 and the orbiting scroll 7, between the shaft 5 and its main bearing member 4, and a back pressure chamber 23 of the orbiting scroll 7. The oil is supplied via the oil supply passage 20 of the shaft 5.

Then, the oil after lubricating each part of the compression mechanism 2 flows to the oil discharge hole 24 provided in the main bearing member 4 of the compression mechanism 2, and from the opening 27 via the oil discharge pipe 25. And is discharged to the oil reservoir 19 in the closed container 1.

Here, the oil flowing to the oil discharge pipe 25 causes pressure fluctuation and pulsates due to the lubrication of each part of the compression mechanism 2, and tries to vibrate the oil discharge pipe 25.

However, since the end of the oil discharge pipe 25 of the present disclosure is fixed to the inner wall surface of the sealed container 1 at the fixed position 26, vibration is suppressed. Therefore, the generation of noise due to the vibration of the oil discharge pipe 25 can be prevented. Here, the end of the oil discharge pipe 25 refers to a portion lower than the lower bearing member 4a of the oil discharge pipe 25 (see a hatched portion near the fixed position 26 in FIG. 1).

The fixed position 26 of the oil discharge pipe 25 is located below the lower bearing member 4 a that supports the shaft 5 of the motor unit 3, so the noise prevention effect can be enhanced.

That is, by fixing the oil discharge pipe 25 at the fixed position 26 in the lower portion than the lower bearing member 4a, the dimension from the fixed position 26 to the opening 27 at the lower end of the pipe becomes short. As a result, the effect of suppressing the vibration of the oil discharge pipe 25 is enhanced. Therefore, the effect of preventing noise generation due to the vibration of the oil discharge pipe 25 can be enhanced.

In the present embodiment, the fixed position 26 of the oil discharge pipe 25 is the edge of the opening 27 at the lower end of the pipe. Therefore, there is no room for vibration generation starting from the fixed position 26 portion, and noise prevention by vibration suppression of the oil discharge pipe 25 can be made reliable.

Further, the fixing of the oil discharge pipe 25 at the fixing position 26 to the closed container 1 is performed by TIG welding. Therefore, even if it is used for a long time, the oil discharge pipe 25 continues to be firmly fixed to the sealed container 1, and the fixed part is loosened by long-term use, and noise generation can be prevented from starting.

TIG welding hardly generates spatter at the time of welding as compared with other welding methods. Therefore, even if the oil discharge pipe 25 is welded and fixed to the closed container 1 in a state where the motor unit 3 is incorporated together with the compression mechanism unit 2, spatter is prevented from adhering to the magnet portion and coil portion of the motor unit 3. it can. Therefore, the performance of the motor unit 3 can be prevented from being affected, and a highly reliable compressor can be realized.

Further, the opening 27 of the oil discharge pipe 25 is drawn to a space below the motor unit 3 so as to return the oil to the space below the motor. As a result, oil can be prevented from being caught in the turbulent air flow of the refrigerant generated in the space above the motor unit 3, and oil flowing out to the refrigeration cycle can be reduced.

In the present embodiment, the opening 27 of the oil discharge pipe 25 is configured to be opened in the oil formed in the oil reservoir 19 in the closed container 1. Thereby, the outflow of oil to the refrigeration cycle can be significantly reduced.

That is, the oil flowing out of the opening 27 of the oil discharge pipe 25 is all returned to the oil. This makes it possible to prevent the oil from splashing back due to a collision with the oil surface, which occurs when the opening is opened above the oil surface in the motor lower space. Therefore, a part of the oil droplets of the rebound oil generated in the lower space of the motor is caught in the turbulent air flow of the refrigerant generated in the container space 15 between the compression mechanism 2 and the motor 3 and flows out to the refrigeration cycle It is also possible to prevent oil spillage into the refrigeration cycle.

According to the present disclosure, it is possible to realize a compressor that has low noise and less oil flow to the refrigeration cycle. However, the configuration of the compressor of the present disclosure is not limited to the shape of the present embodiment. That is, the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of the present disclosure is indicated not by the above description but by the scope of the claims, and is intended to include all modifications within the meaning and the scope of equivalents of the claims.

According to the present disclosure, it is possible to realize a compressor with low noise and less oil spillage into the refrigeration cycle. Therefore, the present disclosure can be widely used for various devices using a refrigeration cycle and is useful.

1, 107 Sealed container 2 Compression mechanism portion 3 Motor portion 3a Notched gap portion 4 Main bearing member 4a

Lower bearing member

5, 109

Shaft

6, 102

Fixed scroll

7, 103 Rotating scroll 8

Rotation restraint mechanism

9, 104 Compression chamber 10, DESCRIPTION OF SYMBOLS 101 Suction pipe 11

Suction chamber

12, 105 Discharge port 13

Reed valve

14, 106 Muffler space 15 Space in

container

17, 108 Discharge pipe 18 Pump (volume-type oil pump)
Reference Signs List 19 oil reservoir 20 oil supply passage 21 bearing portion 22 high pressure region 23 back pressure chamber 24 oil discharge hole 25 oil discharge pipe 26 fixed position 27 opening 50 compressor 109a shaft eccentric shaft 110 bearing member 112 oil passage 113 oil discharge passage 114 Oil guide plate 115 Motor 116 Upper space

Claims

A closed container,
A compression mechanism unit provided in the sealed container;
A motor unit for driving the compression mechanism unit;
A pump for supplying oil to the compression mechanism;
An oil discharge pipe connected to the compression mechanism and returning the oil after lubricating the compression mechanism to a space below the electric motor in the sealed container;
A compressor in which an end of the oil discharge pipe is fixed to a closed container.
The compressor according to claim 1, wherein the oil discharge pipe is fixed to the closed container by TIG welding.
And an oil reservoir provided in the sealed container,
The oil discharge pipe has an opening,
The compressor according to claim 1, wherein the opening is configured to open into the oil accumulated in the oil reservoir.
The motor unit includes a shaft and a lower bearing member supporting the shaft.
The compressor according to any one of claims 1 to 3, wherein a position at which the oil discharge pipe is fixed to the closed container is below the lower bearing member.
The compressor according to claim 4, wherein the position for fixing the oil discharge pipe to the closed container is an opening edge located in the oil accumulated in the closed container.