JPS6340957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a gas compressor that cannot tolerate contamination or leakage of handled gas to the outside.

Generally, this type of gas compressor has a closed structure to prevent contamination due to contact with outside air or lubricating oil, and to prevent leakage to the outside. Also,
Since it is usually impossible to install a speed increaser inside this type of compressor, it is configured to use a high-speed drive motor and a single or multi-stage impeller to generate the required lift, and the bearings are designed to handle the gas that is being handled. A self-contained gas bearing mechanism is adopted.

However, in order to create a compressor with an extremely low compression ratio, a gas bearing mechanism lacks reliability due to the use of a low-speed drive motor, so it is necessary to use a bearing lubricated by liquid. Therefore,
In the motor-driven gas compressor mentioned above, when lubricating the motor shaft bearing with liquid,
Sufficient shaft sealing must be performed so that liquid in the motor chamber does not flow out to the compressor side and gas from the compressor side does not flow into the motor chamber.

As a result of various studies and improvements, the inventor has overcome all the drawbacks of the conventional hermetic compressor, and has achieved smooth compression of the handled gas and effective shaft sealing between the motor section and the compressor section.
We have succeeded in developing a sealed compressor that allows stable operation over long periods of time while ensuring smooth cooling and lubrication of the motor.

That is, the compressor section and the motor section are connected through an adapter, the motor section is made into a canned motor structure, and an auxiliary pump chamber equipped with an impeller rotatably driven by the rotor shaft is provided inside the adapter adjacent to one rotor chamber. an axial through hole between the auxiliary pump chamber and a compression chamber forming a compressor section; A shaft sealing means such as mechanical packing or labyrinth packing is applied to the part,
Furthermore, a part of the auxiliary pump chamber, a part of the shaft sealing means, and the gap of the shaft through hole are configured to communicate with each other to circulate a part of the circulating fluid, thereby lubricating the bearing part of the motor part. It has been found that this can be achieved smoothly by using circulating fluid, and as a result, the sealing of the shaft sealing portion can be achieved sufficiently and reliably.

Therefore, an object of the present invention is to provide a hermetic compressor comprising a compressor section and a motor section,
A sealed compressor that ensures stable shaft sealing between the compressor and motor without interfering with the rotation of the rotor shaft, and allows for easy flushing within the motor to maintain stable operation of the motor. is to provide.

In order to achieve the above object, the present invention connects a compressor section and a motor section via an adapter, and provides a shaft through-hole section in which a compression chamber forming the compressor section and a rotor chamber of the motor section are provided in the adapter. In the hermetic compressor, the shaft through-hole of the adapter is connected to the compression chamber and adjacent to the compression chamber, and a shaft sealing means is applied to the shaft through-hole of the adapter. An external conduit is led out and communicated with the other rotor chamber to circulate liquid within the motor section, and a part of the external conduit is guided into the shaft through hole of the adapter, and a part of the external conduit is connected to the circulating liquid. A heat exchanger for cooling is provided, and a flushing liquid inlet is provided in one of the rotor chambers of the motor section, and a flushing liquid outlet is provided in the shaft through hole near the position where the shaft sealing means is provided. It is characterized by

Next, embodiments of the hermetic compressor according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a compressor section, and 12 indicates a drive motor section, and the compressor section 10 and the motor section 12 are connected in a vertical shaft manner by an adapter 14 to provide compatibility with each other.

The compressor section 10 includes a suction pipe section 20 and a discharge pipe section 22 that communicate with a compression chamber 18 provided with an impeller 16, and the impeller 16 is connected to the motor section 1.
It is attached to the extended end of the rotor shaft 24 of No. 2.

On the other hand, the motor section 12 has a canned motor structure consisting of a stator assembly 26 and a rotor assembly 28. The rotor shaft 24 is supported by an upper bearing 30 and a lower bearing 32, respectively. and a lower rotor chamber 36 are formed. However, an auxiliary pump chamber 38 is defined at the joint between the upper bearing 30 and the adapter 14.
An auxiliary impeller 40 is disposed inside and fixed to the rotor shaft 24. Therefore, the adapter 14 is provided with a liquid passage 42 for discharging the circulating liquid to the outside by the action of the auxiliary impeller 40. In this way, the liquid passage 42 provided in a part of the adapter 14
communicates with an external conduit 44, which is connected to the bottom of the lower rotor chamber 36 with a heat exchanger 46 for cooling the circulating fluid provided at a suitable location.

In the lower rotor chamber 36, a fluid passage hole 48 is formed in the inner circumferential surface of the lower bearing 32, and a passage hole 52 is formed in a part of the bearing support member 50 that supports the lower bearing 32, so that the circulating fluid can flow through the lower rotor chamber 36. A portion of it cools the motor section 12 through the gap between the stator 26 and the rotor 28 while lubricating the lower bearing 32 and is introduced into the upper rotor chamber 34 . Also in the upper rotor chamber 34, a liquid passage hole 54 is formed in the inner circumferential surface of the upper bearing 30 in the same manner as described above, and a passage hole 58 is formed in a part of the bearing support member 56 that supports the upper bearing 30. However, some of the circulating fluid flows through the upper bearing 30.
is guided into the auxiliary pump chamber 38 while being lubricated.

In this manner, according to this embodiment, the liquid circulates within the motor section 12 under the action of the auxiliary impeller 40, thereby achieving lubrication of both the upper and lower bearings 30, 32 and cooling of the motor section 12. Note that a heat exchanger 46 provided in the external conduit 44 is used to cool the circulating fluid.
If the cooling liquid supplied to the motor section 12 is introduced into a jacket section 62 disposed around the outer periphery of the motor section 12 through a conduit 60, the motor section 12 can be cooled more effectively. In addition, the external conduit 4
4, a branch pipe 44a is led out from the top lead-out part and a vent valve 64 is provided here to allow for proper exhaustion, and a branch pipe 44b is led out from the bottom lead-in part and a drain valve 66 is provided here to allow proper exhaustion. Configure so that it can be used as a liquid.

Furthermore, in the hermetic compressor according to the present invention having the above-described configuration, the compressor section 10
The adapter 14 that connects the motor unit 12 and the
The rotor shaft 24 at a position adjacent to the compression chamber 18
A shaft sealing means 70 such as a mechanical packing is applied to a part of the shaft through hole 68 through which the shaft is inserted. In this case, the rotor shaft 24 inserted into the shaft through hole 68 of the adapter 14
In order to smoothly rotate the pump, the auxiliary pump chamber 38
A through hole 72 extending from a part of the shaft through hole 68 to a part of the shaft sealing means 70 is formed substantially parallel to the shaft through hole 68, and a part of the circulating fluid is passed through the through hole 7 under the action of the auxiliary impeller 40.
2 to a part of the shaft sealing means 70, and the circulating fluid is further circulated into the auxiliary pump chamber 38 through the gap of the shaft through hole 68. Note that as the shaft sealing means 70, not only a mechanical packing but also a labyrinth packing or the like can be suitably used.

Further, in this embodiment, if a bearing monitor 74 is attached to a part of the lower rotor chamber 36 of the motor section 12 so as to face the rotor shaft 24 to detect wear of the bearings, the motor section 1
2 is suitable for maintenance. Further, a flushing liquid inlet 76 is provided at the bottom of the lower rotor chamber 36 of the motor section 12, and a flushing liquid outlet 78 is provided which communicates with a through hole 72 formed in a part of the shaft sealing means 70. 12 flushing can be easily performed.

As is clear from the foregoing, according to the hermetic compressor according to the present invention, the motor part has a canned motor structure, and an auxiliary pump chamber is provided inside to perform forced circulation of the internally sealed liquid. The lubrication of the bearing portion can be achieved extremely smoothly, and the sealing of the shaft seal portion can be ensured.

In addition, by installing a heat exchanger in the external conduit that guides the fluid circulating in the motor section to cool the circulating fluid, it is possible to effectively cool the motor section at the same time that the circulating fluid lubricates the bearing section. can.

Furthermore, by providing a flushing liquid inlet in the lower rotor chamber and a flushing liquid outlet communicating with a through hole provided in a part of the shaft sealing means, flushing inside the motor section can be performed appropriately and maintenance of the motor section can be facilitated. This makes it possible to achieve stable operation of the motor unit over a long period of time.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of essential parts of an embodiment of a hermetic compressor according to the present invention. 10... Compressor section, 12... Motor section, 14
...Adapter, 16...Impeller, 18...Compression chamber, 2
0...Suction pipe section, 22...Discharge pipe section, 24...Rotor shaft, 26...Stator assembly, 28...Rotor assembly, 3
0... Upper bearing, 32... Lower bearing, 3
4... Upper rotor chamber, 36... Lower rotor chamber, 38...
Auxiliary pump chamber, 40...Auxiliary impeller, 42...Liquid passage hole, 44...External conduit, 46...Heat exchanger, 48...Liquid passage hole, 50...Bearing support member, 52...Through hole,
54...Liquid hole, 56...Bearing support member, 58
...through hole, 60...conduit, 62...jacket part, 64
...Vent valve, 66...Drain valve, 68...Shaft through hole,
70...Shaft sealing means, 72...Through hole, 74...Bearing monitor, 76...Flushing liquid inlet, 78...Flushing liquid outlet.

Claims (1)

[Scope of Claims] 1. A compressor section and a motor section are connected through an adapter, and a compression chamber forming the compressor section and a rotor chamber of the motor section are communicated with each other through a shaft through-hole provided in the adapter. In a closed type compressor in which a shaft sealing means is applied to the shaft through hole of the adapter adjacent to the chamber, the motor section is provided with an auxiliary pump chamber in the rotor chamber adjacent to the adapter, and an external conduit is led out from this auxiliary pump chamber. is configured to communicate with the other rotor chamber to circulate the liquid within the motor section and to guide a portion of the liquid into the shaft through hole of the adapter, and a heat exchanger for cooling the circulating liquid is provided in a portion of the external conduit. Further, a flushing liquid inlet is provided in one of the rotor chambers of the motor section, and a flushing liquid outlet is provided in the shaft through hole in proximity to the position where the shaft sealing means is provided. Type compressor.