JPH062673A - Closed horizontal scroll fluid machine - Google Patents

Abstract

(57) [Summary] [Purpose] A sufficient amount of oil can be secured, and the effective oil amount can be secured while the height of the oil surface in the motor side chamber can be reduced. [Structure] Scrolls 2 and 3 on one side and motor 5 on the other side
An outer casing 16 that defines the inner space of the casing 1 is provided around the outer periphery of the horizontal casing 1 that accommodates
An oil storage chamber 17 is formed in the outer casing 16. An oil forced feed mechanism using a pumping pump 18 or the like for forcibly feeding the oil returned from the oil feed passage 11 of the drive shaft 4 into the casing 1 to the oil storage chamber 17 is provided. The oil is supplied to the oil supply passage 11 by the lubrication pump 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed horizontal scroll fluid machine equipped with a motor.

[0002]

2. Description of the Related Art Conventionally, a closed horizontal scroll fluid machine in which a motor is installed together with a scroll in a horizontal closed casing has already been proposed, for example, as disclosed in Japanese Utility Model Publication No. 3-19481.

By the way, in general, a horizontal scroll fluid machine is
A scroll in which spiral bodies mesh with each other is installed on one side of a horizontally long closed casing in which both ends of a cylindrical body are closed, and a motor having a drive shaft for driving at least one of the scrolls is installed on the other side. At the same time, a lubrication pump for supplying lubricating oil to the lubrication point is provided on the shaft end side of the drive shaft.The lubricating oil supplied to the lubrication point is the lower part of the body of the casing, that is, the body. The oil is stored on one side in the radial direction. Therefore, if an attempt is made to secure a sufficient amount of oil necessary for lubrication, the oil level will exceed the rotating portion of the motor.

However, when the oil level exceeds the rotating portion of the motor, the lubricating oil stored in the lower portion of the body is agitated by the rotation of the rotating portion, and the motor input is reduced. In addition to the increase, the agitated oil is discharged to the outside of the machine together with the fluid discharged or discharged from the scroll, causing the oil to rise and causing poor lubrication.

Therefore, when the closed casing is of a horizontal type, it is necessary to lower the height of the oil surface of the oil reservoir from that of the rotating portion of the motor, so that a sufficient amount of oil cannot be secured. In addition, in order to secure it, it is necessary to increase the body diameter of the casing.

That is, in the above-mentioned conventional example, as shown in FIG. 5, the anti-scroll side body diameter of the motor M in the horizontally sealed casing C is set to a large diameter as shown in FIG.
The height H of the oil surface in the oil storage section at the lower part of the body is set to be lower than the height of the rotor R of the motor M, and the amount of oil in the oil storage section is increased.

In FIG. 5, Fs is a fixed scroll,
Os is a movable scroll, F is an internal housing having a bearing for supporting the drive shaft S of the motor M, A is a suction pipe, and B is B.
Is a discharge pipe, OP is a lubrication pump provided at the shaft end of the drive shaft S, and SP is an oil suction pipe.

[0008]

However, in the conventional example described above, only one end in the length direction of the casing C is formed to have a large diameter, and the oil reservoir is provided over the entire lower portion of the casing C, so that the casing C has a large size. However, it is not possible to secure a sufficient amount of oil, and the oil reservoir contains the motor M.
If the oil level rises due to operating conditions, the rotor R of the motor M will be immersed in the oil level. In this case, the oil agitation phenomenon will occur. The problem of increasing the motor input and the problem of oil rising still remain.

The present invention has been made in view of the above problems, and an object thereof is to secure a sufficient amount of oil and to effectively reduce the oil level of a motor side chamber in which a motor is installed. This is to secure a sufficient amount of oil, and to effectively prevent the occurrence of seizure at the lubrication point due to poor performance due to oil agitation in the rotating part and poor lubrication.

[0010]

In order to achieve the above object, the present invention has a horizontal casing 1, a scroll 2,
3 and a motor 5 having a drive shaft 4 for driving at least one of the scrolls 2 and 3, and a low pressure pipe 32 communicating with the low pressure side of the scrolls 2 and 3 and a high pressure pipe communicating with the high pressure side. A sealed horizontal scroll fluid machine having a lubricating pump 12 for supplying oil to an oil supply passage 11 of the drive shaft 4 and having an internal space of the casing 1 defined on the outer periphery of the casing 1. The outer casing 16 is provided to form an oil storage chamber 17 in the outer casing 16, and oil returned from the oil supply passage 11 into the casing 1 is stored in the oil storage chamber 17
While the oil forced feed mechanism for forcibly feeding the oil is provided, the suction port of the lubrication pump 12 is opened to the oil storage chamber 17 so that the amount fed by the oil forced feed mechanism is smaller than the amount fed by the lubrication pump 12. It was set large.

Further, it is preferable that the outer casing 16 has a low pressure pipe 32 opened above the inner casing side of the motor 5 and at the low pressure side of the scrolls 2 and 3 via a communication hole 33.

[0012]

The outer casing 1 is provided around the outer periphery of the casing 1.
6 is provided to form the oil storage chamber 17 in the outer casing 16, the oil storage chamber 17 is the same as the casing 1 described above.
Since the inside is defined, and an oil forced feed mechanism for forcibly feeding the oil that has been fed to the oil feed passage 11 by the lubricating pump 12 and returned to the inside of the casing 1 to the oil storage chamber 17 is provided. Since a large amount of the filling oil can be stored in the oil storage chamber 17, it is possible to secure a sufficient amount of oil while lowering the height of the oil surface in the casing 1.

That is, since the oil after lubrication returned to the casing 1 can be forcibly returned to the oil storage chamber 17 around the horizontal casing 1 by the oil forced feed mechanism, the amount of oil filled in the oil storage chamber 17 is increased. Since most of the oil can be stored, the oil level inside the casing 1 can be kept low, and even if the oil level rises due to operating conditions, it is possible to avoid dipping the rotating part in the oil level. Therefore, the problem of oil agitation does not occur, the problem of oil rising due to oil agitation can be eliminated, and a sufficient amount of oil can be secured, and the oil defined inside the casing 1 can be secured. Since oil can be supplied from the storage chamber 17 to the oil supply location, an effective amount of oil can be secured and the problem of poor lubrication can be solved.

Above the outer casing 16,
When the low pressure pipe 32 is opened on the interior side of the motor 5 and the communication hole 33 is provided on the scroll side of the horizontal casing 1 to open the outer casing 16 on the low pressure side of the scrolls 2 and 3, The suction fluid introduced from the pipe 32 into the outer casing 16 flows around the interior portion of the motor 5 in the casing 1. Therefore, the suction fluid causes the motor 5 in the casing 1 to flow.
It is also possible to cool the motor 5, and while the motor 5 can be cooled in this way, the suction fluid is transferred to the motor of the horizontal casing 1.
Since it is not introduced into the side chamber, it is possible to prevent the lubricating oil in the horizontal casing 1 from mixing with the intake fluid and rising.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The scroll fluid machine shown in FIGS. 1 and 2 is a refrigerant compressor mainly for compressing a refrigerant of a refrigerating machine.
A fixed scroll 2 having a spiral body 2a inside a horizontal casing 1 formed of a cylindrical body 1a and lids 1b and 1c closing both ends of the body 1a, and a fixed scroll 2 of the fixed scroll 2. A movable scroll 3 having a spiral body 3a that meshes with the spiral body 2a is installed inside, and a motor 5 having a drive shaft 4 for revolving the movable scroll 3 is installed inside the other side. In the side chamber 6, on the back side of the movable scroll 3, a first scroll that is connected to the fixed scroll 2 is provided.
A bearing housing 7 is housed inside, and the scroll side of the drive shaft 4 is supported by a bearing 7a of the bearing housing 7, so that the movable scroll 3 rotates between the bearing housing 7 and the back surface of the movable scroll 3. A second bearing having a ball bearing 9 for supporting the anti-scroll side of the drive shaft 4 is provided on the anti-scroll side of the motor 5 in the motor side chamber 6, while an Oldham coupling 8 for preventing and revolving is provided. A housing 10 is provided inside, and a bearing pump 10 is provided in the bearing housing 10 for supplying lubricating oil to an oil supply passage 11 formed in the shaft center portion of the drive shaft 4, and a partition wall is provided on the rear side of the fixed scroll 2. A discharge chamber 14 is provided via 13, and a high-pressure pipe 15 serving as a discharge pipe is opened in the discharge chamber 14.

The embodiment shown in FIGS. 1 and 2 is a scroll compressor having the above-described structure. The scroll compressor has a cylindrical shape around the outer periphery of the casing 1 and has a diameter larger than that of the casing 1 and surrounds the body 1a. An outer casing 16 including an outer cylinder 16a and closing plates 16b and 16c for closing both ends of the outer cylinder 16a is provided, and an oil reservoir defined in the inner space of the casing 1 is provided in the outer casing 16. Room 17
And a pump 1 for pumping the oil in the motor-side chamber 6 from the motor-side chamber 6 to the lubricating pump 12.
8 are arranged side by side, and the pumping pump 18 forcibly feeds the oil supplied from the lubricating pump 12 to the oil supply passage 11 and returned to the motor side chamber 6 to the oil reservoir chamber 17. On the other hand, the suction port of the lubricating pump 12 is opened at the bottom of the oil storage chamber 17, and the feeding amount of the pumping pump 18 is set to be larger than the lubricating amount of the lubricating pump 12.

The lubrication pump 12 and the pumping pump 18
Is operated in conjunction with the rotation of the drive shaft 4. That is, the stepped tubular presser foot 19 that presses the inner ring 9a of the ball bearing 9 is fitted onto the drive shaft 4 and integrally rotatably coupled thereto, and the lubrication is performed on the outer peripheral side of the small diameter portion 19a of the presser foot 19. The pump housing 20 of the pump 12 and the pumping pump 18 is arranged, and the pump housing 20
Is fixed in the tubular boss portion 10a of the second bearing housing 10, and the pump inner 12 constituting the lubricating pump 12 is provided in the inner cavity of the pump housing 20.
a, a pump outer 12b, and a pump inner 18a and a pump outer 18 which constitute the pumping pump 18.
b and the interior of the pump housing 20 in parallel with each other via a partition plate 21, and the housing 20 is provided on the open side of the pump housing 20.
An end plate 22 that closes the inner cavity is disposed and is fixed to the boss portion 10a of the second bearing housing 10.

More specifically, as shown in the enlarged view of FIG. 2, the lubrication pump 12 and the pumping pump 18 are, for example, of the trochoid type, and the pump inners 12a, 18a are connected to the drive shaft 4 respectively. The outer peripheral surface of each pump outer 12b, 18b is rotatably supported on the inner peripheral surface of the pump housing 20 while being fixed to the outer peripheral surface of the small diameter portion 19a of the presser foot 19 which rotates together with the inner peripheral surface of the pump. The inner circumferences of the inner parts 12a and 18a are engaged with each other.
A first pumping suction passage 23 communicating with the suction side of the pumping pump 18 and a first pumping discharge passage 24 communicating with the discharge side are provided, and the second bearing housing 10 communicates with the suction passage 23, A second pumping suction passage 25 having a suction port 25a whose tip opens to the motor side chamber 6, and the discharge passage 2
And a second pumping discharge passage 26 having a discharge port 26a whose tip opens into the oil storage chamber 17 and is connected to the end plate 22 on the suction side of the lubricating pump 12. The first oil supply suction passage 27 communicating with the lubricating pump 1
A first oil supply discharge passage 28 that communicates with the second discharge side is provided, and the second bearing housing 10 has a suction port that communicates with the first oil suction passage 27 and has a tip opening into the oil storage chamber 17. 29 a and has the second suction suction passage 25.
Second oil supply suction passage 29 provided at a position out of phase with
Further, at the center of the small-diameter portion 19a of the presser foot 19, a second oil supply discharge passage 30 having one end communicating with the first oil supply discharge passage 28 and the other end communicating with the oil supply passage 11 of the drive shaft 4. Is provided.

As shown in FIG. 3, the second bearing housing 10 is provided with a cylindrical boss portion 10a at its center and three radially extending leg portions 10b on its outer periphery, and the boss portion 10a is provided. The ball bearing 9 is supported on one side in the axial direction, the pump housing 20 is inserted and fitted on the other side, and the end plate 22 is attached.
0b, the second pumping suction passage 25 and the second refueling suction passage 29 are formed in the downward leg 10b with the phases thereof shifted, and the lower portion of the casing 1 is penetrated into the second refueling suction passage 29. Oil supply pipe 31 protruding into the bottom of the oil storage chamber 17
In addition, the second pumping discharge passage 26 that opens to the oil storage chamber (17) is provided in the leg portion 10b that is inclined upward.
Is formed. That is, this second pumping discharge passage 26
As shown in FIG. 3, a through hole which extends to the tip end surface of the leg portion 10b and which is in contact with the tip end surface is provided in the body 1a of the horizontal casing 1 corresponding to the second scooping discharge passage 26. The discharge passage 26 is opened to the oil storage chamber 17 through the through hole.

Further, in the embodiment shown in FIG. 1, the outer casing 16 extends the open end portions of the lids 1b and 1c to expand the diameter, and the expanded portion is used to close the closing plate 16.
b and 16c, and the outer cylinder 16a is fitted to the outer circumferences of the closing plates 16b and 16c on the large diameter side to be integrally formed with the horizontal casing 1.

Above the outer casing 16,
The low-pressure pipe 32 is opened on the side opposite to the scroll to introduce the intake fluid into the space above the oil storage chamber 17, and at the portion of the body 1a of the horizontal casing 1 facing the scrolls 2 and 3. The outer casing 16
Communication hole 33 that opens to the low pressure side of the scrolls 2 and 3
Is provided so that the suction fluid is sucked into the scrolls 2 and 3 without flowing into the motor side chamber 6.

Further, in FIG. 1, 34 is an oil return pipe composed of a capillary tube having one end opened to the discharge chamber 14 and the other end opened to the motor side chamber 6, and the oil separated in the discharge chamber 14 is It is returned to the motor side chamber 6.

In the embodiment shown in FIGS. 1 and 2, the axial thicknesses of the pump peneer 18a and the pump outer 18b constituting the pumping pump 18 are set to be the pump inner 12a and the pump outer of the lubricating pump 12. 12
Although it is made thicker than the axial thickness of b and the pumping oil amount of the pumping pump 18 is made larger than the oil supply amount of the lubricating pump 12,
The amount in the radial direction may be changed to make the pumping oil amount of the pumping pump 18 larger than the oil supply amount of the lubricating pump 12.

Next, the operation of the embodiment configured as described above will be described.

In this embodiment, when the drive shaft 4 is driven by the motor 5, the movable scroll 3 revolves, and the suction fluid such as the gas refrigerant sucked from the low pressure pipe 32 into the motor side chamber 6 is From the inlet between the movable scroll 3 and the fixed scroll 2, the scrolls 2,
Is sucked into the working space formed between the three, compressed by the orbital motion of the movable scroll 3, and discharged into the discharge chamber 14 through the discharge port 2b of the fixed scroll 2 and the discharge valve 35 provided in the partition wall 13, It is discharged to the outside through the high pressure pipe 15.

The pumps 12 and 18 are operated by the drive of the drive shaft 4, and the oil stored in the oil storage chamber 17 is sucked by the operation of the lubrication pump 12 and the first pump is operated.
Also, oil is supplied to the oil supply passage 11 from the second oil supply discharge pipes 28 and 30, and lubricating oil is supplied to the oil supply locations such as the bearing 7a.

The oil supplied to the oil supply point is returned to the motor side chamber 6 and is discharged from the discharge port 2b to the discharge chamber 14, and the oil separated in the chamber 14 is also passed through the oil return pipe 34. Is returned to the motor-side chamber 6 and stored in the lower part of the motor-side chamber 6, but this oil is sucked from the suction port 25a opening to the motor-side chamber 6 by the operation of the pumping pump 18, The oil is pumped to the oil storage chamber 17 through the second pumping discharge passages 24 and 26.

As a result, the oil level of the oil stored in the motor side chamber 6 can be suppressed to the opening height of the suction port 25a, that is, the suction port 25a is located near the bottom of the motor side chamber 6. The oil level can be made lower than the rotating portion of the motor 5, that is, the rotation locus of the rotor 5a and the balance weights 36 and 37, and the oil storage chamber 17 is Since it is formed around the outer periphery of the horizontal casing 1, a sufficient amount of oil can be secured, and in addition, the oil storage chamber 17 is formed in the outer cylinder radial direction of the outer casing 16.
Since the suction port 29a of the lubricating pump 12 is opened at 7, the amount of ineffective oil can be reduced, and the effective amount of oil with respect to the filling amount of lubricating oil can be sufficiently secured.

Moreover, since the oil level of the motor side chamber 6 can be constantly lowered, there is no oil agitation by the rotating portion,
It is possible to avoid an increase in motor input and oil rise due to oil agitation.

Further, as in the embodiment shown in FIG. 1, the low pressure pipe 32 is opened to the oil storage chamber 17 of the outer casing 16 so that the suction fluid introduced from the low pressure pipe 32 into the outer casing 16 is transferred to the casing 1. Therefore, the suction fluid can cool the motor 5, and the suction fluid can be cooled while the motor 5 is cooled in this manner. Since it is not introduced into the rotor side chamber 6, it is possible to prevent the lubricating oil in the horizontal casing 1 from mixing with the intake fluid and rising.

Next, the second embodiment shown in FIG. 4 will be described.

In the second embodiment, one lubrication pump 40 is used to supply oil to the oil supply passage 11 and pump oil to the oil storage chamber 17 in common, and common parts are shown in FIG. The same reference numerals as those in the first embodiment shown in 2 are used.

That is, in the second embodiment shown in FIG. 4, as in the first embodiment, the pump inner 4 is attached to the second bearing housing 10.
0a and a pump outer 40b, which is assembled with a trochoid type lubricating pump 40, and an end plate 22 which is coupled to the end surface of the boss portion 10a of the second bearing housing 10.
The discharge passage 41 provided in the end plate 22 is attached to the presser 19
And the bearing housing 10
Is connected to the pumping-up discharge passage 43 opening to the oil storage chamber 17, and a first suction passage 44 provided in the end plate 22 is provided in the second bearing housing 10 and is connected to the motor. A communication passage 46 for communicating the oil storage chamber 17 with the lower portion of the motor side chamber 6 is provided at the lower portion of the casing 1 while communicating with the second suction passage 45 having the suction port 45a opening to the side chamber 6. The amount of discharged oil Q flowing from the oil storage chamber 17 to the motor side chamber 6 through the communication passage 46.
1, the amount of pumping oil Q2 pumped from the second suction passage 45 to the oil storage chamber 17 is increased, and the lubricating pump 4
The intake oil amount Q3 of 0 is equal to or more than the total oil amount (Q1 + Q4) of the exhaust oil amount Q1 and the return oil amount Q4 returned to the motor side chamber 6 from the oil supply point and the oil return pipe 34. The oil returned to the motor side chamber 6 is supplied to the oil storage chamber 1
It is possible to force delivery to 7.

According to the above construction, the oil forced feed mechanism for forcibly feeding the oil returned to the motor side chamber 6 to the oil storage chamber 17 while the one lubricating pump 40 can supply the oil to the lubrication point. Therefore, the number of parts can be reduced as compared with the first embodiment, and the cost can be reduced accordingly.

In the embodiment described above, the low pressure pipe 32 is opened in the oil storage chamber 17 of the outer casing 16.
The low pressure pipe 32 may be opened to the motor side chamber 6 of the horizontal casing 1 or may be opened directly to the low pressure side of the scrolls 2 and 3.

Further, although the above-mentioned embodiments have been shown to be applied to the refrigerant compressor, they can be applied to other compressors and expanders.

Further, although one of the scrolls 2 and 3 is a fixed scroll and the other scroll 3 is a movable scroll, both scrolls 2 and 3 may be movable.

[0038]

As described above, according to the present invention, the scrolls 2, 3 and the scrolls 2, 3 are provided in the horizontal casing 1.
A motor 5 having a drive shaft 4 for driving at least one of
A low pressure pipe 32 communicating with the low pressure side of the scrolls 2 and 3 and a high pressure pipe 15 communicating with the high pressure side of the scrolls 2 and 3, and a lubricating pump 12 for supplying lubricating oil to the oil supply passage 11 of the drive shaft 4. In the hermetic horizontal scroll fluid machine configured as described above, an outer casing 16 defined by the inner space of the casing 1 is provided around the outer periphery of the casing 1.
While forming an oil storage chamber 17 in the outer casing 16 and providing an oil forced feed mechanism for forcibly feeding the oil returned from the oil supply passage 11 into the casing 1 to the oil storage chamber 17, Since the suction port of the lubricating pump 12 is opened to the oil storage chamber 17 and the amount of oil fed by the oil forced feed mechanism is set to be larger than the amount of oil fed by the lubricating pump 12, a sufficient amount of oil can be secured. However, the effective oil amount can be secured while the height of the oil level in the casing 1 can be reduced.

Therefore, the problem of poor lubrication due to lack of oil in the horizontal type can be solved, and even if the oil level rises due to operating conditions, the rotating part can be prevented from being immersed in the oil level. It is possible to eliminate the oil agitation described above, and it is possible to solve the problems of increased motor input and oil spillage due to the oil agitation.

Above the outer casing 16,
When the low pressure pipe 32 is opened on the interior side of the motor 5 and the communication hole 33 is provided on the scroll side of the horizontal casing 1 to open the outer casing 16 on the low pressure side of the scrolls 2 and 3, The suction fluid introduced from the pipe 32 into the outer casing 16 flows around the interior portion of the motor 5 in the casing 1. Therefore, the suction fluid causes the motor 5 in the casing 1 to flow.
It is also possible to cool the motor 5, and while the motor 5 can be cooled in this way, the suction fluid is transferred to the motor of the horizontal casing 1.
Since it is not introduced into the side chamber, it is possible to prevent the lubricating oil in the horizontal casing 1 from mixing with the intake fluid and rising.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the first embodiment.

FIG. 3 is a side view of only the bearing housing.

FIG. 4 is a partially omitted vertical sectional view showing a second embodiment.

FIG. 5 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal casing 2 Scroll 3 Scroll 4 Drive shaft 5 Motor 11 Oil supply passage 12, 40 Lubrication pump 15 High pressure pipe 16 Outer casing 17 Oil storage chamber 32 Low pressure pipe 33 Communication hole

Claims (2)

[Claims] 1. A scroll 2, 3 is provided in a horizontal casing 1.
And a motor 5 having a drive shaft 4 for driving at least one of the scrolls 2 and 3, and a low pressure pipe 32 communicating with the low pressure side of the scrolls 2 and 3 and a high pressure pipe 15 communicating with the high pressure side. And a lubricating pump 12 for supplying oil to an oil supply passage 11 of the drive shaft 4, the hermetic horizontal scroll fluid machine comprising:
An outer casing 16 defined by the inner space of the casing 1 is provided around the outer periphery of the casing 1, and an oil storage chamber 17 is formed in the outer casing 16 and returned to the casing 1 from the oil supply passage 11. An oil forced feed mechanism for forcibly feeding oil to the oil storage chamber 17 is provided, while the suction port of the lubricating pump 12 is opened in the oil storage chamber 17.
The lubrication pump 12 determines the feed amount by the oil forced feed mechanism.
The sealed horizontal scroll fluid machine is characterized in that it is set larger than the oil supply amount by. 2. The outer casing 16 is a horizontal casing 1.
This outer casing 16 consists of an outer cylinder that surrounds the outer periphery of
Above, the low-pressure pipe 32 is opened to the interior side of the motor 5, and the outer casing 16 is provided to the scroll side of the horizontal casing 1, and the communication hole 33 is provided to open to the low-pressure side of the scrolls 2 and 3. The sealed horizontal scroll fluid machine according to claim 1.