JP2010501783A - A block-type rotary airfoil oil rotary vacuum pump or vane compressor with a disk armature-type synchronous motor overhanging and supported - Google Patents

Abstract

  A rotor (6) driven by a drive shaft which can rotate in the housing (2), and can slide in a circumferential direction outwardly in a slit (7) of the rotor (6). A blade plate (8), which separates the individual delivery chambers of the working chamber (9) having a suction port (1) and a discharge port from each other and is driven by centrifugal force along the inner wall of the housing. In the rotary airfoil oil rotary vacuum pump or vane compressor occupying the maximum outer position, the brushless disk armature synchronous motor (11, 12) is attached to the rotor shaft in the axial direction.

Description

  The present invention relates to a rotary airfoil oil rotary vacuum pump or vane compressor described in the premise of claim 1.

  This can be a rotary airfoil rotary vacuum pump or vane compressor that operates dry, as well as a circulating lubrication type. These usually have a horizontal construction form, and the blades that are movable in the rotor are graphite in the case of rotary airfoil rotary vacuum pumps or vane compressors that operate dry. Or it is usually made of graphite composite material, whereas in the case of a circulating oil lubricated rotary airfoil oil rotary vacuum pump or vane compressor, the blades are made of plastic or plastic composite material. It can be done.

  Circulating oil lubricated rotary airfoil oil rotary vacuum pumps or vane compressors with block-type or overhanging rotors usually operate with single-phase AC motors or three-phase asynchronous motors. These types of pumps and compressors have been used successfully for decades and are subject to intense exclusion competition in a wide variety of markets.

Cylindrical rotary airfoil oil rotary vacuum pumps or vane compressors with circulating oil lubrication are only in block form for small delivery flow rates, ie for delivery flow rates from about 2 m ³ / h up to 100 m ³ / h Composed. Above such a delivery flow rate, the surface area of the pump or compressor is no longer sufficient to dissipate the heat of compression. Accordingly, larger vacuum pumps and compressors are mainly configured in a conventional manner with a coupling between the drive motor and the pump or compressor stage.

  The use of an AC drive device or a DC drive device is a conventional technology in the world. Such a drive device includes a rotor and a cylindrical housing fixedly attached to an end shield on the A side of the motor. Since a small gap is required between them, it is necessary to finely adjust the motor bearing portion, which is relatively expensive. Therefore, the drive motor is not only subject to the above-mentioned fine adjustment, especially in the case of high-quality vacuum pumps and compressors, and also does not comply with the required accuracy while maintaining the quality constant. Must not. The result is the high cost of these types of motors and the limited supplier market.

  In addition to this, the AC drive device and DC drive device with an output range of 80 W to 2 kW employed in this case are not only occupying a clearly large design volume due to the relatively low efficiency, but also inevitably. Due to the long design form, it is also not possible to make the best use of the conceivable design space.

The above-described circulating oil lubrication block type rotary airfoil oil rotary vacuum pump or vane compressor can basically be subdivided into the following two types.
1) A circulating oil-lubricated rotary airfoil oil rotary vacuum pump or vane compressor comprising an oil mist separator disposed on the side of the pump stage / compressor stage and the motor. Since this design form has a relatively large outside area, it can be applied to any design size, ie from about 2 m ³ / h up to a maximum of 100 m ³ / h. In addition, the oil mist separator can be used for heat discharge to the outside, except for the inner area of the gas inlet flange to the pump / compressor stage, the entire outer surface of which.
2) A circulating oil lubricated rotary airfoil oil rotary vacuum pump or vane compressor comprising an oil mist separator disposed axially relative to the pump stage / compressor stage. In this design, one of the axial housing covers is the A side motor shield itself, whereas the other axial housing cover is directly coupled to the oil mist separator, thereby The drive motor, pump stage / compressor stage, and oil mist separator will be arranged in direct contact in the axial direction. However, this means that the oil mist separator or pump / compressor stage lacks one major outer surface for heat removal. For this reason, and because this design has an excessively high ratio of length (axial length) to width with respect to the bottom surface in many applications, this type of machine is mainly about 2 m ³ / It is only embodied in design sizes from h up to 12 m ³ / h.

  In a small rotary airfoil oil rotary vacuum pump or vane compressor of the circulating oil lubrication type, the rotor's overhanging support, gap that is strictly adjusted (between 0.02 and 0.04 mm) from the time of manufacture, As a result of the relatively high radial stresses on the rotor and the rotor, there is often a problem that noise is generated during the test operation, especially the contact between the stationary housing and the rotor. May not be acceptable to users.

  Therefore, the object of the present invention is to eliminate the above-mentioned drawbacks, the design size of the entire machine is minimized, the process safety during manufacturing is increased, and at the same time, the assembly of the machine is continuously simplified. Thus, it is to constitute a rotary airfoil oil rotary vacuum pump or vane compressor of the type belonging to this field.

  The constituent features of the present invention for solving this problem are apparent from claim 1. Preferred embodiments are set forth in the other claims.

  The present invention comprises an oil mist separator mounted in parallel, i.e. with an oil mist separator mounted laterally or axially with respect to a common motor shaft and pump / compressor shaft. It includes a block-type rotary airfoil oil rotary vacuum pump or vane compressor that is supported and operates dry, or preferably lubricated in a circulating manner.

  According to the invention, the bearing is moved from the motor into the pump stage / compressor stage, i.e. the rotor itself is directly supported by the housing cover of the pump stage / compressor stage by means of slide bearings or needle bearings. An overhanging and supported disk armature type synchronous motor having a brushless armature is used as a driving device. Based on a structure with two stator disks, one on each side of a disk armature equipped with permanent magnets, the axial stress is almost entirely compensated, thereby eliminating the need for support by thrust bearings To.

  This surprisingly simple structure of the present invention not only minimizes the overall design size of the pump or compressor and achieves the required accuracy for rotor guidance, but also approximately 75- An improvement in motor efficiency from 80% to 85-95% is also realized. Thereby, direct cooling of the motor by the motor fan can be omitted.

  Ultimately, the structure of the present invention simplifies the handling of the vacuum pump or compressor in logistics. This is because the complexity, that is, the variety of motor modes for each design size is reduced from more than 20 conventional modes to one mode by adopting simple electronic control and so-called multi-voltage power supply.

  Thus, the idea underlying the present invention is to attach a brushless disc armature synchronous motor to the rotor shaft in the axial direction. In the embodiment of the present invention, the synchronous motor has a stator disposed on both sides of the disk armature for the purpose of compensating for axial stress, or is configured as a disk armature only on one side. A stator may be provided, in which case the generated axial stress is received by a thrust bearing.

  In the present invention, a housing narrow portion is formed between the pump stage / compressor stage and the disk armature type synchronous motor, or thermal separation is realized by the housing shape itself.

  It is also included in the scope of the present invention that a hall sensor is provided for position recognition for control.

  In a development of the invention, an oil mist separator is arranged around the housing of the pump stage / compressor stage so that a minimum design space is realized with a generally square bottom surface. May be intended.

  Finally, according to the present invention, it may be intended that the rotor shaft is provided with a fan for discharging the compression heat from the machine with respect to the disk armature type synchronous motor.

  As an alternative or addition, the rotor shaft is fitted with a ventilator impeller that serves to cool the pump stage / compressor stage with cooling air against the pump stage / compressor stage on the side facing the disk armature synchronous motor. It may be done.

  Next, the present invention will be described in detail with reference to the drawings.

FIG. 2 is a longitudinal sectional view schematically showing a circulating oil lubrication block type rotary blade oil rotary vacuum pump having a disk armature type synchronous motor which is overhanged and supported, which is constructed according to the present invention. It is a cross-sectional view along the II-II line of FIG.

  As is apparent from the drawings, in the illustrated circulating oil-lubricated rotary airfoil oil rotary vacuum pump, the delivery medium is drawn tangentially into the working chamber 9 of the housing 2 through the suction port 1, It is sent to the oil mist separator 4 through the plurality of holes 3 in the axial direction.

  The oil mist separator 4 is directly flange-bonded to the pump stage / compressor stage via the housing intermediate cover 5. The delivery medium reaches the air deoiling member 15 in the oil mist separator 4 and then reaches the gas outlet 16.

  As is apparent from FIG. 2, the rotor 6 disposed in the housing 2 includes a plurality of blade slits 7 which are engraved radially or non-axisymmetrically on the outside of the rotor 6. A wing plate 8 is slidably disposed in the wing plate slit 7. These blades 8 separate the individual delivery chambers of the working chamber 9 from one another.

  The housing 2 is separated by an intermediate cover 5 on the left side as viewed in FIG. 1 and separated by another cover 10 on the right side as viewed in FIG. A brushless disk armature motor housing is attached to the outside of the housing cover 10. It has a brushless disc armature 11 equipped with permanent magnets and two stator discs 12 with multipolar electrical windings. The position sensors necessary for the motor controller for controlling the motor winding are not shown in detail in the drawing.

  The simple support of the entire rotor 6 is embodied by a needle bearing 13 in the illustrated embodiment. Instead of this, it is of course possible to use a plain bearing instead of the needle bearing 13.

  The motor chamber is sealed by a normal radial shaft seal ring 14.

  It should be noted that the constituent elements of the present invention not described in detail above should be referred to the drawings and claims.

Claims (8)

A rotor (6) driven by a drive shaft which can rotate in the housing (2), and can slide in a circumferential direction outwardly in a slit (7) of the rotor (6). A blade plate (8), which separates the individual delivery chambers of the working chamber (9) having a suction port (1) and a discharge port from each other and is driven by centrifugal force along the inner wall of the housing. In a rotary airfoil oil rotary vacuum pump or vane compressor,
A rotary airfoil oil rotary vacuum pump or vane compressor, characterized in that a brushless disk armature synchronous motor (11, 12) is attached to the rotor shaft in the axial direction.   The disk armature synchronous motor has stators (12) respectively disposed on both sides of the disk armature (11) for the purpose of compensating for axial stress. The vacuum pump or compressor described.   The disk armature synchronous motor has a stator (12) disposed on one side of the disk armature (11), in which generated axial stress is received by a thrust bearing. The vacuum pump or compressor according to claim 1.   A housing narrow portion is formed between the pump stage / compressor stage and the disk armature type synchronous motor (11, 12), or thermal separation is realized by the housing shape itself. The vacuum pump thru | or compressor of any one of Claims.   The vacuum pump or compressor according to any one of the preceding claims, wherein a hall sensor is provided for position recognition for control.   The oil mist separator (4) is arranged around the housing (2) of the pump stage / compressor stage so that a minimum design space is achieved on a square base as a whole. A vacuum pump or compressor according to any one of the preceding claims, characterized in that it is characterized in that   10. A fan according to claim 1, wherein a fan is arranged on the rotor shaft with respect to the disk armature synchronous motor (11, 12) for discharging compression heat from the machine. The vacuum pump or compressor described.   Mounted on the rotor shaft is a ventilator impeller that serves to cool the pump stage / compressor stage with cooling air with respect to the pump stage / compressor stage on the side facing the disk armature synchronous motor (11, 12). The vacuum pump or compressor according to any one of claims 1 to 6, wherein the vacuum pump or the compressor is provided.

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