CN111946618A

CN111946618A - Vortex type refrigeration compressor

Info

Publication number: CN111946618A
Application number: CN202010955255.9A
Authority: CN
Inventors: 闫伟国; 常艳红; 杨春立
Original assignee: Panasonic Appliances Compressor Dalian Co Ltd
Current assignee: Panasonic Appliances Compressor Dalian Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2020-11-17

Abstract

The invention provides a scroll refrigeration compressor. The compressor of the present invention comprises: the device comprises a shell, an air suction pipe, a supporting mechanism, a crankshaft, a motor, an oil pool and the like; in order to ensure the assembly precision, the supporting mechanism is divided into three parts, namely a supporting frame, a bearing seat and a cover plate; the supporting frame and the bearing seat are made into corresponding gaps, a thin-sheet plug gauge is arranged between the supporting frame and the bearing seat to ensure the air gap between the stator and the rotor, the plug gauge is drawn out after the bearing seat is fixed, and then a cover plate is arranged to seal the gaps; in addition, a channel is arranged on the side wall of the support frame, which is opposite to the air suction pipe, and the periphery of the channel is enclosed and sealed by the interference surface of the support frame and the shell. Above-mentioned design makes thorough isolation of motor coil and oil bath, and after the refrigerant got into the coil cavity, partly passed through from the stator-rotor air gap, and all the other gaps that can only follow support frame terminal surface and motor passed through to guarantee that the oil bath is stable, reduce the volume of spouting the oil.

Description

Vortex type refrigeration compressor

Technical Field

The invention relates to the technical field of compressors, in particular to a scroll refrigeration compressor with an air suction pipe arranged below a motor.

Background

When the compressor runs in winter, the evaporation pressure is low, the refrigerant circulation volume is small, and the motor needs better cooling. One common solution is to arrange the suction pipe below the motor so that the refrigerant completely passes around the motor to cool the motor.

The air suction pipe is arranged at the lower part of the motor, which means that the air suction pipe is close to the oil pool, and the refrigerant sucked into the compressor must be well isolated from the oil pool, otherwise, the air flow can interfere the oil surface and form foam, so that the oil output is increased. One common method for preventing foam generation is to form the lower support into a cover to cover the wires under the motor, and the refrigerant enters the cover directly and then flows out from the upper part mostly.

The lower support is formed as an integral cover with the following disadvantages:

1. the stator and rotor gaps are shielded, and the stator and rotor gaps cannot be guaranteed by directly using a sheet plug gauge;

2. the coaxiality of the upper bearing and the lower bearing is difficult to realize.

Disclosure of Invention

In accordance with the technical problems set forth above, a scroll refrigeration compressor is provided. The technical means adopted by the invention are as follows:

a vortex type refrigeration compressor comprises a shell, a motor, an oil pool, an air suction pipe and a motor rotator supporting structure which are arranged in the shell, wherein a supporting frame is arranged in the shell, the outer surface of the supporting frame is an interrupted arc surface and integrally and annularly surrounds a coil at the lower part of the motor, the interrupted outer circle surface of the supporting frame is fixed with the shell in an interference fit manner, one interference surface of the supporting frame is provided with an air suction channel corresponding to the air suction pipe, the shell is correspondingly provided with an opening, the peripheral interference surfaces seal the air suction channel, a stator of the motor is arranged above the supporting frame, a bottom plate of the supporting frame is provided with a central hole for mounting a bearing seat, a first channel is arranged between the supporting frame and the bearing seat, a cover plate is arranged on the outer circle surface of the bearing seat, the cover plate is arranged on the supporting, the gas that the suction passage got into gets into the oil bath through first passageway and first gap, exists the second gap between motor and the support frame, and the gas through the second gap does not get into the oil bath, and the flow area who does not get into the oil bath gap is greater than the flow area who gets into the oil bath gap.

Further, the motor comprises a stator and a rotor, the rotor is connected with the crankshaft, a third gap is formed between the rotor and the stator, gas passing through the third gap does not enter the oil pool, the crankshaft is inserted into the bearing seat to form a fourth gap, and the gas passing through the fourth gap enters the oil pool.

Further, the air suction pipe is welded on the shell opposite to the air suction channel.

Furthermore, the center hole is irregular, the outer contour of the bearing seat is matched with the center hole, the bearing seat and the bearing seat are fixed through a second screw group, and the cover plate is installed on the support frame through a first screw group.

Further, the motor rotator supporting structure comprises a bearing seat and a ball bearing installed in the bearing seat, a full-circle outer surface is processed below a gap of an outer contour of the bearing seat, a hole is formed in the middle of an upper top plate of the bearing seat, the ball bearing is shielded by the rest of the bearing seat, a groove for placing an elastic check ring is formed in an inner hole of a main body of the bearing seat, and the elastic check ring is used for axially restraining the ball bearing.

Furthermore, the crankshaft forms clearance fit with a center hole of the ball bearing through an opening in the middle of the upper top plate of the bearing seat, a shaft shoulder is pressed on the upper end face of the ball bearing to perform axial positioning, a thread is machined at the tail end of the crankshaft, and a connecting sleeve is installed on the thread at the tail end of the crankshaft and used for fastening the crankshaft and the ball bearing together.

Further, the first passage can accommodate a plug gauge for spacing between the gap between the stator and rotor before the cover plate is installed, thereby ensuring a minimum spacing therebetween.

The invention has the following advantages: the bearing seat, the cover plate and the crankshaft approximately seal the bottom hole of the support frame together, so that an independent cavity is formed by the support frame and the motor; after entering, the gas can only flow out from the gaps of the stator and the rotor and the gap between the support frame and the stator core; the gas channel and the oil pool can be well separated, and lubricating oil can not be blown into foam any more, so that the oil output is reduced. In addition, the bottom hole of the support frame and the petal shape of the bearing seat form a channel together, and when the bearing seat and the crankshaft are assembled, the sheet plug gauge is placed into the stator from the channel; the petal-type gap is reserved in the bearing seat, so that the plug gauge cannot be influenced when the bearing seat is installed; and after the bearing seat is aligned and fixed, the plug gauge is pulled out. The plug gauge can ensure the normal use of the plug gauge, and simultaneously, the gas channel and the oil pool are well isolated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a partial axial sectional view of a compressor.

Fig. 2 is a bottom view of the support frame and the bearing seat after being installed.

Figure 3 is a bottom view of the plug gauge in use.

FIG. 4 is a partial axial cross-sectional view of the plug gauge in use.

Fig. 5 is a schematic view of the holder, wherein (a) is a bottom view, (b) is a front view, and (c) is a sectional view at a suction passage.

Fig. 6 is a top view of the bearing housing.

In the figure: 1. a stator; 2. an air intake duct; 3. a support frame; 4. a ball bearing; 5. a bearing seat; 6. a cover plate; 7. a first screw set; 8. a second screw set; 9. a rotor; 10. a housing; 11. a second slit; 12. a third gap; 13. a suction pipe sealing surface; 14. pressing and kneading the dough; 15. a first slit; 16. a fourth gap; 17. a first channel; 20. a connecting sleeve; 21. a crankshaft; 22. a circlip; 23. the surface of the outer circle; 24. an air suction passage; 25. a chamber; 26. a central bore; 27. an oil sump; 28. a plug gauge.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present embodiment discloses a scroll refrigeration compressor, which includes a casing 10, and a motor, an oil pool, an air suction pipe 2 and a motor rotator supporting structure arranged in the casing 10, wherein a supporting frame 3 is arranged inside the casing, as shown in fig. 2, an outer surface of the supporting frame 3 is an interrupted arc surface, and the whole surrounds a lower coil of the motor in a ring shape, an interrupted outer circumferential surface 23 of the supporting frame 3 is fixed in an interference fit with the casing 10, an air suction channel 24 corresponding to the air suction pipe 2 is arranged on one interference surface of the supporting frame 3, an opening is arranged at a corresponding position of the casing, and the air suction channel 24 is sealed by the interference surfaces around the casing. The stator 1 of the motor is arranged above the support frame, a central hole 26 for installing the bearing seat 5 is formed in a bottom plate of the support frame, a first channel is formed between the support frame 3 and the bearing seat 5, a cover plate 6 is arranged on the outer circumferential surface of the bearing seat 5, the cover plate 6 is arranged on the support frame 3, a pressing surface 14 between the cover plate and the bearing seat forms a sealing surface, a first gap 15 is formed between the cover plate 6 and the bearing seat 5, gas entering from the air suction channel 24 enters the oil pool 27 through the first channel 17 and the first gap 15, a second gap 11 is formed between the motor and the support frame 3, specifically, the upper end surface of the support frame is opposite to the end surface of the stator core and provided with the second gap 11, the gas passing through the second gap 11 does not enter the oil pool 27, and the flow area of the.

The motor comprises a stator 1 and a rotor 9, the rotor 9 is connected with a crankshaft 21, a third gap 12 is formed between the rotor 9 and the stator 1, gas passing through the third gap 12 does not enter an oil pool, the crankshaft 21 is inserted into a bearing seat 5 to form a fourth gap 16, and the gas passing through the fourth gap 16 enters the oil pool. To this end, the housing 10, the support frame 3, the stator 1, the rotor 9, the crankshaft 21, the bearing housing 5, and the cover plate 6 together form a chamber 25.

The suction pipe 2 is welded to the casing 10 opposite to the suction passage 24. The air suction pipe and the shell support are provided with an air suction pipe sealing surface 13.

The center hole is irregular, as shown in fig. 5(a) (b) (c) and 6, in the embodiment, the center hole is petal-shaped, the outer contour of the bearing seat is matched with the center hole, the protruding part is provided with a through hole and provided with a screw, the recessed part and the support frame form a first channel together, the first channel and the second channel are fixed through a second screw group 8, and the cover plate is arranged on the support frame through a first screw group 7.

The motor rotator supporting structure comprises a bearing seat and a ball bearing 4 arranged in the bearing seat, the outer surface of a whole circle is processed under a gap of the outer contour of the bearing seat, a hole is formed in the middle of an upper top plate of the bearing seat, the ball bearing is shielded by the rest of the hole, a groove for placing an elastic retainer ring 22 is formed in an inner hole of a main body of the bearing seat, and the elastic retainer ring is used for axially restraining the ball bearing.

The crankshaft forms clearance fit with a central hole of the ball bearing through an opening in the middle of an upper top plate of the bearing seat, a shaft shoulder is pressed on the upper end face of the ball bearing to perform axial positioning, a thread is machined at the tail end of the crankshaft, a connecting sleeve 20 is installed on the thread at the tail end of the crankshaft, and the connecting sleeve 20 is used for fastening the crankshaft and the ball bearing together.

As shown in fig. 3 and 4, the first passage can accommodate a plug gauge, the plug gauge is used for being arranged between gaps between the stator and the rotor before the cover plate is installed, the minimum distance is ensured, specifically, the first passage 17 is just used for placing the plug gauge 28 before the cover plate 6 is installed, the plug gauge 28 is arranged in the third gap 12 to ensure the minimum distance, after the bearing seat 5 is fixed, the plug gauge 28 is pulled out, and the cover plate 6 is installed to seal the first passage 17.

When the compressor works, gas enters the cavity 25 through the gas suction pipe 2 and the first channel 17; and the outlet of the chamber 25 comprises a first slit 15, a fourth slit 16, a third slit 12 and a second slit 11; when the design is carried out, the flow areas of the first gap 15 and the fourth gap 16 are far smaller than the flow areas of the second gap 11 and the third gap 12, so that most of gas is discharged from the chamber 25 through the second gap 11 and the third gap 12, and only a very small part of gas is blown to the oil pool 27 through the first gap 15 and the fourth gap 16; the gas blown out from the first slit 15 and the fourth slit 16, once discharged, rapidly decreases in speed due to a rapid expansion of the flow area, thereby avoiding an excessive influence on the oil surface. The motor coil and the oil pool are thoroughly separated, after a refrigerant enters the coil cavity, one part of the refrigerant passes through the air gap of the stator and the rotor, and the rest refrigerant can only pass through the gap between the end surface of the support frame and the motor, so that the stability of the oil pool 27 is ensured, and the oil output is reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vortex type refrigeration compressor comprises a shell, a motor, an oil pool and an air suction pipe, wherein the motor, the oil pool and the air suction pipe are arranged in the shell, the vortex type refrigeration compressor is characterized in that a motor rotating body supporting structure and a supporting frame are further arranged in the shell, the outer surface of the supporting frame is an interrupted arc surface and integrally and annularly surrounds a coil at the lower part of the motor, the interrupted outer circle surface of the supporting frame is fixed with the shell in an interference fit manner, one interference surface of the supporting frame is provided with an air suction channel corresponding to the air suction pipe, the shell is provided with an opening at a corresponding position, the peripheral interference surface seals the air suction channel, a stator of the motor is arranged above the supporting frame, a bottom plate of the supporting frame is provided with a central hole for mounting a bearing seat, a first channel is arranged between the supporting frame and the bearing seat, a cover plate, the gas that the suction passage got into gets into the oil bath through first passageway and first gap, exists the second gap between motor and the support frame, and the gas through the second gap does not get into the oil bath, and the flow area who does not get into the oil bath gap is greater than the flow area who gets into the oil bath gap.

2. The scroll type refrigeration compressor according to claim 1, wherein the motor includes a stator and a rotor, the rotor is connected to the crankshaft, a third gap is formed between the rotor and the stator, the gas passing through the third gap does not enter the oil sump, the crankshaft is inserted into the bearing housing to form a fourth gap, and the gas passing through the fourth gap enters the oil sump.

3. The scroll refrigerant compressor as set forth in claim 1, wherein said suction tube is welded to said housing opposite said suction passage.

4. The scroll-type refrigeration compressor of claim 1, wherein the central hole is irregular, the outer contour of the bearing seat is matched with the central hole, the bearing seat and the bearing seat are fixed by a second screw group, and the cover plate is mounted on the support frame by a first screw group.

5. The scroll refrigeration compressor according to any one of claims 1 to 4, wherein the motor rotator supporting structure includes the bearing seat and a ball bearing installed in the bearing seat, a full-circle outer surface is processed below a notch of an outer contour of the bearing seat, a hole is formed in a middle of an upper top plate of the bearing seat, the ball bearing is shielded by the rest of the bearing seat, a groove for placing a resilient retainer is formed in an inner hole of a main body of the bearing seat, and the resilient retainer is used for axially restraining the ball bearing.

6. The scroll refrigeration compressor of claim 5, wherein the crankshaft is in clearance fit with a central hole of the ball bearing through a central opening of the upper top plate of the bearing seat, a shaft shoulder is pressed on the upper end face of the ball bearing for axial positioning, a thread is processed at the tail end of the crankshaft, and a connecting sleeve is mounted on the thread at the tail end of the crankshaft and used for fastening the crankshaft and the ball bearing together.

7. The scroll refrigerant compressor of claim 2, wherein the first passage is configured to receive a plug gauge for seating between the gap between the stator and rotor prior to installation of the cover plate to ensure a minimum clearance therebetween.