JPH0312680B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a scroll-type fluid machine used in a compressor of a refrigeration system, and more specifically, a scroll-type fluid machine that includes a fixed scroll and a revolving scroll in a casing, and a motor that drives the revolving scroll. The present invention relates to a scroll type fluid machine in which the drive shaft of the motor is supported by a bearing of a frame built in the casing.

(Prior Art) A conventional scroll-type fluid machine of this type is disclosed in, for example, U.S. Pat. No. 4,389,171, and as shown in FIG.
A fixed scroll 2 and a revolving scroll 3 are connected to a frame 4.
A motor M is disposed at the inner lower part of the casing 1, and a drive shaft 5 extending vertically in the frame 4 is rotatably supported via a plurality of bearings 6. The upper end of the shaft 5 is connected to the revolving scroll 3, and the lower end is connected to the motor M, and the revolution of the revolving scroll 3 with respect to the fixed scroll 2 is caused by the rotation of the drive shaft 5 as the motor M is driven. It's like being driven.

The casing 1 also includes a suction pipe 1 extending from the outside of the casing 1 to the lower side of the motor M.
a, and the suction gas introduced from the suction pipe 1a to the lower side of the motor M is transferred from the air gap G formed between the rotor R and the stator S of the motor M, as shown by the solid arrow. , through the internal space of the casing 1 to the suction ports of the scrolls 2 and 3, and compressing the suction gas between the scrolls 2 and 3;
When this suction gas passes through the air gap G of the motor M, the motor M is cooled.

Further, an oil supply passage 5a is formed inside the axial center of the drive shaft 5 and extends vertically.
The lower end of a is made to face an oil reservoir a provided at the bottom of the casing 1, and the lubricating oil pumped up from the oil reservoir a through the oil supply passage 5a is applied to each of the bearings 6, the drive shaft 5, and the oil reservoir a. The lubricating oil is supplied to the oil supply points such as the connecting portion with the revolving scroll 3, and the lubricating oil after the oil supply points are supplied to the above-mentioned frame 4.
The oil is then refluxed to the oil sump a in the casing 1.

(Problems to be Solved by the Invention) In the scroll-type fluid machine as described above, the suction gas sucked from the suction pipe 1a is
The lubricating oil is supplied to the suction ports of the scrolls 2 and 3 through the air gap G of the motor M, and the lubricating oil is supplied to the motor M through the oil supply passage 5a of the drive shaft 5 after the lubricating oil has been supplied to the oil supply points. Therefore, when the suction gas passes through the air gap G of the motor M, a portion of the lubricating oil that has been dropped onto the motor M is mixed into the suction gas, and this lubricating oil Problems such as mixed suction gas being sucked into the interior through the suction ports of the scrolls 2 and 3 cause liquid compression within the scrolls 2 and 3, and causing oil to rise in the oil sump a. It was hot.

The present invention has been made in view of the above-mentioned problems, and its purpose is to separate lubricating oil mixed into the suction gas by using the centrifugal force of rotation of the rotor constituting the motor. Let each scroll inhale suction gas that is not mixed with lubricating oil,
The object of the present invention is to provide a scroll-type fluid machine that can reliably prevent liquid compression in each scroll and oil leakage in the oil reservoir.

(Means for Solving the Problems) The scroll type fluid machine of the present invention is constructed as shown in FIG. and the drive shaft 5 of the motor M is mounted inside the casing 1.
In a scroll-type fluid machine supported by bearings 6 of a frame 4 installed in Suction passage 1 leading to intake ports 2 and 3
2, the structure 4 covers the outside of the coil end E in the stator S, faces the outer periphery of the base of the coil end E, and causes suction gas passing through the base of the coil end E to collide with the frame 4. A collision wall 13 is integrally provided to form a separation chamber K inside the collision wall 13, while the casing 1 is provided at a position away from a portion of the collision wall 13 facing the outer periphery of the base of the coil end E. and the separation chamber K is opened toward the gap t.
It is characterized by providing an opening 4a that communicates with the.

(Function) The suction gas passing through the air gap G of the motor M enters the separation chamber K, changes its flow, flows outside the coil end E, and flows from the opening 4a to the gap t. Due to the gas flow direction and rotational centrifugal force of the rotor R of the motor M, it passes through the base of the coil end E and collides with the collision wall 13 facing the outer periphery of the base of the coil end E, thereby creating a gap t from the opening 4a. This allows the flow direction of the suction gas containing a large amount of lubricating oil to flow in the same direction.

Therefore, the flow rate of the suction gas passing through the base of the coil end E is higher than that in the case where it flows straight from the air gap G to the suction passage, and the flow rate of the suction gas containing more lubricating oil is correspondingly higher. As a result, the collision against the collision wall 13 facing the outer periphery of the base of the coil end E increases, and the separation effect can be increased.

Therefore, since the rotational centrifugal force of the rotor R can be effectively utilized to more reliably separate the lubricating oil, suction gas without lubricating oil mixed in is supplied to the suction ports of each of the scrolls 2 and 3. It is.

(Example) A scroll type fluid machine according to the present invention will be explained below with reference to an example shown in the drawings.

The scroll-type fluid machine shown in FIG.
The fixed scroll 2 and the revolving scroll 3 facing the fixed scroll 2 are supported via a frame 4 fixed to the casing 1, and a motor M consisting of a rotor R and a stator S is installed at a lower position of the casing 1. At the same time, a drive shaft 5 extending vertically is supported on the frame 4 via a bearing 6 to freely rotate, and a lower part of the drive shaft 5 is connected to the motor M.
A counterweight 7 is integrally attached to a protruding portion of the drive shaft 5 that protrudes upward from the bearing 6, and a counterweight 7 is connected to the rotor R of the drive shaft 5. a transmission mechanism 8 that drives the revolving scroll 3 to revolve relative to the fixed scroll 2 as the shaft 5 rotates;
is interposed.

The transmission mechanism 8 includes a swing link 9 having a balance weight provided above the counterweight 7, and a drive pin 10a and a limit pin 10 protruding from the counterweight 7.
b, the swing link 9 is interlocked and connected to the counterweight 7 via these pins 10a and 10b, and the swing link 9
The boss portion 3a of the revolving scroll 3 is supported by a bearing at a position displaced with respect to the drive shaft 5, and an Oldham ring 11 is interposed between the revolving scroll 3 and the frame 4. 11 prevents the rotation of the revolving scroll 3 and causes the revolving scroll 3 to revolve relative to the fixed scroll 2.

In this way, the suction gas drawn into the interior from the suction pipe 1a connected to the lower position of the casing 1,
A suction port 2 is guided upward from the lower side of the motor M through an air gap G formed between a stator S and a rotor R constituting the motor M, and is formed between the fixed scroll 2 and the revolving scroll 3.
a and compressed between the scrolls 2 and 3.

Further, the drive shaft 5 is formed with an oil supply hole 5a that penetrates in the vertical direction inside the shaft center, and the oil supply hole 5a faces the bottom oil reservoir of the casing 1, and the oil supply hole 5a is made to face the oil reservoir at the bottom of the casing 1. The lubricating oil pumped up is supplied to oil supply points such as the bearing 6 and the transmission mechanism 8.

In the scroll-type fluid machine as described above, as shown in FIG. A suction passage 12 is formed which communicates with the suction port 2a of each of the scrolls 2 and 3 through a gap t. A collision wall 13 facing the outer periphery of the base is integrally provided, and a separation chamber K is formed inside the collision wall 13, while a separation chamber K is formed at a portion of the collision wall 13 that is separated from the portion of the collision wall 13 facing the outer periphery of the base. opening toward the casing 1 at a position, and
An opening 4a communicating with the gap t is provided.

By doing so, the suction gas that has passed through the air gap G of the motor M enters the separation chamber K and changes its flow, and the suction gas flows outside the coil end E and flows from the opening 4a to the gap t. The gas flow direction and the rotor R of the motor M
A flow of suction gas containing a large amount of lubricating oil passes through the base of the coil end E due to rotational centrifugal force, collides with the collision wall 13 facing the outer periphery of the base of the coil end E, and flows from the opening 4a to the gap t. This allows the directions to be the same.

Therefore, the flow rate of the suction gas passing through the base of the coil end E is higher than that in the case where it flows straight from the air gap G to the suction passage, and the flow rate of the suction gas containing more lubricating oil is correspondingly higher. As a result, the collision against the collision wall 13 facing the outer periphery of the base of the coil end E increases, and the separation effect can be increased.

Therefore, the rotational centrifugal force of the rotor R can be effectively utilized to more reliably separate the lubricating oil, and the suction gas from which the lubricating oil has been separated flows from the opening 4a through the suction passage 12. It is supplied to the suction ports 2a of each scroll 2, 3. Further, in the embodiments shown in FIGS. 2 and 3, the collision wall covers the outside of the coil end E, leaving a part of the outer wall facing the lead wire lead-in portion 4b to the motor M in the frame 4. 13, and the opening 4a is formed at an upper position of the collision wall 13 to guide the suction gas from which the lubricating oil has been separated by colliding with the collision wall 13 to the suction passage 12. .

Further, a lubricating oil return passage 4c extending in the vertical direction is formed in the frame 4 at an intermediate portion between the collision wall 13 and the lead wire lead-in portion 4b, and the lubricating oil supply point is supplied with lubrication through this return passage 4c. The lubricating oil after the lubricating oil is returned to the oil reservoir at the bottom of the casing 1, and the upper surface of the frame 4 is formed with key grooves 4d for sliding the keys provided on the Oldham ring 11. are doing.

(Effects of the Invention) As explained above, in the scroll type fluid machine of the present invention, the rotor R and stator S of the motor M
A suction passage 12 is formed from an air gap G formed between the stator S to the suction port 2a of each of the scrolls 2 and 3 through a gap t between the frame 4 and the casing 1.
A collision wall 13 is integrally provided, which covers the outside of the coil end E, faces the outer periphery of the base of the coil end E, and causes the suction gas passing through the base of the coil end E to collide with the collision wall 13. A separation chamber K is formed inside the collision wall 13.
By providing an opening 4a that opens toward the casing 1 and communicates the separation chamber K with the gap at a position away from the portion facing the outer periphery of the base of the coil end E, the air gap The suction gas from G enters the separation chamber K and changes its flow, and the flow direction of the suction gas flowing outside the coil end E and flowing from the opening 4a to the gap t and the rotor of the motor M are changed. A collision wall 13 that passes through the base of the coil end E with a rotational centrifugal force of R and faces the outer periphery of the base of the coil end E.
The flow direction of the suction gas containing a large amount of lubricating oil that collides with the air gap G and flows from the opening 4a to the gap t can be made the same direction as that of the suction gas that passes through the base of the coil end E from the air gap G. The amount increases compared to when it flows straight into the suction passage,
The flow velocity of the suction gas containing a large amount of lubricating oil increases accordingly, and as a result, the collision against the collision wall 13 facing the outer periphery of the base of the coil end E increases, and the separation effect can be increased.

Therefore, the rotational centrifugal force of the rotor R can be effectively used to more reliably separate the lubricating oil, and the suction ports 2a of each of the scrolls 2 and 3 have
By supplying suction gas that does not contain lubricating oil, it has become possible to reliably prevent liquid compression from occurring in each of these scrolls 2 and 3 and from causing oil to drain from the oil reservoir provided in the casing 1. It is.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a scroll-type fluid machine according to the present invention, Fig. 2 is an enlarged plan view of the main parts, Fig. 3 is a bottom view of the same, and Fig. 4 is a drawing showing a conventional example. . 1...Casing, 2...Fixed scroll, 3
...Revolving scroll, 4 ... Frame, 5 ... Drive shaft, 6 ... Bearing, 12 ... Oil supply passage, 13 ... Collision wall, M ... Motor, S ... Stator, E ... Coil end, R ...Rotor, G...Air gap, K...Separation chamber.

Claims (1)

[Claims] 1 A fixed scroll 2, a revolving scroll 3, and a motor M for driving the revolving scroll 3 are installed inside the casing 1, and a drive shaft 5 of the motor M is supported by a bearing 6 of a frame 4 installed inside the casing 1. In the scroll type fluid machine, the air gap G between the rotor R and the stator S of the motor M is connected to the frame 4 and the casing 1.
A suction passage 12 is formed which leads to the suction port of each of the scrolls 2 and 3 through a gap between the frame 4 and the base of the coil end E. A collision wall 13 facing the outer periphery and causing the suction gas passing through the base of the coil end E to collide is integrally provided to form a separation chamber K inside the collision wall 13. Scroll type, characterized in that an opening 4a that opens toward the casing 1 and communicates the separation chamber K with the gap is provided at a position apart from the part facing the outer periphery of the base of the end E. Fluid machinery.