CN215949875U - Magnetic suspension pump, refrigeration plant and air condensing units - Google Patents

Abstract

The utility model belongs to the technical field of power devices, and particularly provides a magnetic suspension pump, refrigeration equipment and an air conditioner outdoor unit. The utility model aims to solve the problem that a protective bearing of the existing magnetic suspension pump is easy to be damaged by the impact of a rotating shaft when a motor is powered off, therefore, the magnetic suspension pump comprises a motor, a pump, a first sealing ring and a second sealing ring, wherein the motor comprises a shell and the rotating shaft; the pump comprises a pump shell and an impeller, the pump shell is fixedly connected with the casing or integrally manufactured, and the impeller is coaxially and fixedly connected with the rotating shaft; one of the first seal ring and the second seal ring is arranged on the pump shell or the machine shell, the other of the first seal ring and the second seal ring is arranged on the impeller, the first seal ring and the second seal ring are matched, and one of the first seal ring and the second seal ring is divided by the other of the first seal ring and the second seal ring to form an annular groove. The magnetic suspension pump of the utility model reduces the impact force of the rotating shaft on the protective bearing, and effectively avoids the risk of damaging the protective bearing.

Description

Magnetic suspension pump, refrigeration plant and air condensing units

Technical Field

The utility model belongs to the technical field of power devices, and particularly provides a magnetic suspension pump, refrigeration equipment and an air conditioner outdoor unit.

Background

The magnetic suspension motor mainly comprises a shell, a stator, a rotating shaft, a radial magnetic suspension bearing and an axial magnetic suspension bearing, wherein the stator is arranged in the shell and fixedly connected with the shell, the rotating shaft is arranged in the stator, the radial magnetic suspension bearing is used for supporting the rotating shaft to rotate, and the axial magnetic suspension bearing is used for keeping the axial position of the rotating shaft. The magnetic suspension motor also comprises a protective bearing arranged in the shell, and the protective bearing is used for bearing the static rotating shaft. When the magnetic suspension motor works, the radial magnetic suspension bearing is electrified to separate the rotating shaft from the protection bearing and suspend the rotating shaft.

The magnetic suspension pump comprises a magnetic suspension motor and a pump driven by the magnetic suspension motor. When the magnetic suspension pump is powered off, the rotating shaft rotating at high speed loses buoyancy and impacts the protection bearing, and the protection bearing is easily damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that a protective bearing of the existing magnetic suspension pump is easily damaged by the impact of a rotating shaft when a magnetic suspension motor is powered off.

In order to achieve the above object, the present invention provides a magnetic suspension pump, which comprises a motor, a pump, a first sealing ring and a second sealing ring, wherein the motor comprises a casing and a rotating shaft; the pump comprises a pump shell and an impeller, the pump shell is fixedly connected with the machine shell or integrally manufactured, and the impeller is coaxially and fixedly connected with the rotating shaft; one of the first seal ring and the second seal ring is provided on the pump housing or the casing, the other of the first seal ring and the second seal ring is provided on the impeller, the first seal ring and the second seal ring are matched, and one of the first seal ring and the second seal ring is scribed by the other into an annular groove.

Optionally, the first sealing ring is an annular tooth, and the section of the annular tooth is wedge-shaped; the second sealing ring is an annular sleeve, or the second sealing ring is composed of a plurality of semi-annular structures.

Optionally, the second sealing ring corresponds to at least two of the first sealing rings.

Optionally, the hardness of the first seal ring is greater than the hardness of the second seal ring.

Optionally, the first sealing ring comprises a first axial sealing ring and a first radial sealing ring, the second sealing ring comprises a second axial sealing ring and a second radial sealing ring, the first axial sealing ring is matched with the second axial sealing ring, and the first radial sealing ring is matched with the second radial sealing ring.

Optionally, the pump casing includes an inner volute and an outer volute, and the inner volute and the outer volute are respectively provided with at least one first sealing ring or second sealing ring.

Optionally, the magnetic levitation pump includes two pumps, and the two pumps are respectively disposed at two ends of the motor in the axial direction.

Optionally, the pump is a centrifugal pump.

In addition, the utility model also provides refrigeration equipment which comprises the magnetic suspension pump in any one of the technical schemes.

In addition, the utility model also provides an air conditioner outdoor unit which comprises the magnetic suspension pump in any one of the technical schemes.

Based on the foregoing description, it can be understood by those skilled in the art that, in the foregoing technical solution of the present invention, by providing the first seal ring on one of the pump casing and the impeller, providing the second seal ring on the other of the pump casing and the impeller, and matching the first seal ring and the second seal ring, and making one of the first seal ring and the second seal ring be divided by the other into the annular groove, the pump casing and the impeller can be dynamically sealed by the first seal ring and the second seal ring, and at the same time, the impeller can freely rotate relative to the pump casing by the annular groove.

It will also be appreciated by those skilled in the art that the clearance between the first and second seal rings is small because the annular groove is defined by either the first or second seal ring, particularly when the impeller is rotating. Therefore, when the motor is powered off, the first sealing ring and the second sealing ring can be contacted firstly, and then the rotating shaft is contacted with the protective bearing. When first sealing ring and second sealing ring contacted each other, can absorb the kinetic energy and the momentum of pivot to alleviate the pivot to the striking dynamics of protection bearing, avoided the impaired risk of protection bearing effectively.

Further, by providing the first seal ring as an annular tooth, the width of the annular groove can be sufficiently narrow, thereby reducing the amount of outward leakage of fluid in the pump casing.

Still further, through setting up first sealing ring to include first axial sealing ring and first radial sealing ring, set up the second sealing ring to include second axial sealing ring and second radial sealing ring for first axial sealing ring and second axial sealing ring can absorb the ascending impact force of axial and restriction pivot epaxial displacement when the pivot cuts off the power supply, and first radial sealing ring and the radial sealing ring of second can absorb the ascending impact force of pivot radial and restriction pivot epaxial displacement when the pivot cuts off the power supply, and consequently can prevent that the pivot from taking place to deflect.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly explain the technical solution of the present invention, some embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. Those skilled in the art will appreciate that elements or portions of the same reference number identified in different figures are the same or similar; the drawings of the utility model are not necessarily to scale relative to each other. In the drawings:

FIG. 1 is a cross-sectional view of a magnetic suspension pump in accordance with certain embodiments of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 2;

fig. 4 is an enlarged view of a portion C in fig. 3.

Detailed Description

It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present invention, not all of the embodiments of the present invention, and the part of the embodiments are intended to explain the technical principles of the present invention and not to limit the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments provided by the present invention without inventive effort, shall still fall within the scope of protection of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Fig. 1 is a sectional view of a maglev pump according to some embodiments of the present invention, fig. 2 is an enlarged view of a portion a of fig. 1, fig. 3 is an enlarged view of a portion B of fig. 2, and fig. 4 is an enlarged view of a portion C of fig. 3.

As shown in fig. 1, in some embodiments of the utility model, a magnetic levitation pump includes a motor 1 and a pump 2. Preferably, the magnetic levitation pump includes two pumps 2, and the two pumps 2 are respectively disposed at both ends of the motor 1 in the axial direction. Furthermore, a person skilled in the art can also configure only one pump 2 for the maglev pump, if desired, i.e. omit the pump 2 on the left or right side of the motor 1 in fig. 1. Alternatively, one skilled in the art can also connect at least two pumps 2 in series on the left or right side of the motor 1 as desired.

With continued reference to fig. 1, the motor 1 includes a housing 11, a shaft 12, a radial magnetic bearing 13, an axial magnetic bearing 14, and a protection bearing 15. Wherein the rotating shaft 12 is rotatably arranged in the housing 11, and the radial magnetic bearing 13, the axial magnetic bearing 14 and the protection bearing 15 are fixedly arranged inside the housing 11.

In the energized state of the electric motor 1, the radial magnetic bearing 13, the axial magnetic bearing 14 and the protective bearing 15 all have a gap with the rotating shaft 12. Wherein, the radial clearance between the radial magnetic suspension bearing 13 and the rotating shaft 12 is smaller than the radial clearance between the protection bearing 15 and the rotating shaft 12; and the radial clearance between the axial magnetic suspension bearing 14 and the rotating shaft 12 is smaller than the radial clearance between the protective bearing 15 and the rotating shaft 12. So that in the de-energized state of the machine 1 the shaft 12 abuts against the protective bearing 15 and does not come into contact with the radial magnetic bearings 13 and/or the axial magnetic bearings 14.

With continued reference to fig. 1, the rotating shaft 12 is provided with a thrust disc 121, and two sides of the thrust disc 121 are respectively provided with an axial magnetic suspension bearing 14. When the motor 1 is energized, there is a gap between the thrust disk 121 and each of the two axial magnetic bearings 14.

It should be noted that, in the present invention, the radial magnetic bearing 13 and the axial magnetic bearing 14 each include a coil, and are members capable of generating a magnetic force when energized. Since the radial magnetic bearings 13 and the axial magnetic bearings 14 are conventional parts in the art and are commercially available, the present application is not described in more detail.

With continued reference to fig. 1, the pump 2 includes a pump housing 21 and an impeller 22. Wherein, the pump shell 21 is fixedly connected with the casing 11 or integrally manufactured, and the impeller 22 is coaxially and fixedly connected with the rotating shaft 12. The rotation of the shaft 12 drives the impeller 22 to rotate synchronously. Further, the pump housing 21 is provided with an inlet 201 and an outlet 202. The rotating impeller 22 creates a negative pressure within the pump casing 21, thereby forcing ambient fluid into the pump casing 21 from the inlet 201 and causing fluid within the pump casing 21 to exit the pump casing 21 from the outlet 202.

Although not shown in the figures, in some embodiments of the utility model, the pump 2 is a centrifugal pump and the impeller 22 is a centrifugal impeller. Of course, the skilled person can also set the pump 2 as a plunger pump, a gear pump, a vane pump, a rotor pump, etc. in other embodiments of the utility model, as required.

With continued reference to fig. 1, the pump casing 21 includes an inboard volute 211 and an outboard volute 212. The inside volute 211 and the outside volute 212 are fixedly connected together by screws or bolts, and the inside volute 211 is fixedly connected together with the housing 11 by screws or bolts.

As shown in fig. 2 and 3, in some embodiments of the utility model, the maglev pump further comprises a first seal ring 3 and a second seal ring 4 that mate with each other. Wherein the first seal ring 3 is provided on the impeller 22 and the second seal ring 4 is provided on the pump housing 21. Further, the first seal ring 3 may be provided on the pump housing 21 and the second seal ring 4 may be provided on the impeller 22, as required, by those skilled in the art.

Preferably, as shown in fig. 2 and 3, the first sealing ring 3 comprises a first radial sealing ring 31 and a first axial sealing ring 32, the second sealing ring 4 comprises a second radial sealing ring 41 and a second axial sealing ring 42, the first radial sealing ring 31 is matched with the second radial sealing ring 41, and the first axial sealing ring 32 is matched with the second axial sealing ring 42.

As can be seen from the figure, the first radial seal ring 31 and the first axial seal ring 32 are respectively provided in plural numbers, such that the second radial seal ring 41 corresponds to the plural first radial seal rings 31, and the second axial seal ring 42 corresponds to the plural first axial seal rings 32. As can be appreciated by those skilled in the art, having the second seal ring 4 correspond to a plurality of first seal rings 3 reduces stress between the second seal ring 4 and the first seal rings 3, preventing the second seal ring 4 and the first seal rings 3 from excessively abrading each other. Furthermore, by providing the second seal ring 4 corresponding to the plurality of first seal rings 3, it is possible to form multiple seals between the second seal ring 4 and the first seal rings 3, thereby preventing leakage of the fluid in the pump housing 21.

Further preferably, as shown in fig. 2 and 3, the inner volute 211 and the outer volute 212 are respectively provided with a second radial sealing ring 41 and a second axial sealing ring 42. Furthermore, one skilled in the art may also provide the second radial seal ring 41 and the second axial seal ring 42 only on the inner volute 211 or the outer volute 212, as desired; alternatively, the second radial seal ring 41 is provided on one of the inner volute 211 and the outer volute 212, and the second axial seal ring 42 is provided on the other of the inner volute 211 and the outer volute 212.

Although not shown in the drawings, the first seal ring 3 is an annular tooth, that is, the first radial seal ring 31 and the first axial seal ring 32 are both annular teeth. Preferably, the cross-section of the annular teeth is wedge-shaped.

Further, although not shown in the drawings, the second seal ring 4 is an annular sleeve, or the second seal ring 4 is composed of a plurality of semi-annular structures. That is, the second radial seal ring 41 and/or the second axial seal ring 42 are annular sleeves, or the second seal ring 4 is composed of a plurality of semi-annular structures.

Preferably, the first radial sealing ring 31 and the first axial sealing ring 32 are integrally formed on the impeller 22. Alternatively, the first radial seal ring 31 and the first axial seal ring 32 may be fixed to the impeller 22 by a screw connection, a welding connection, an interference fit connection, a screw connection, or the like, as required by those skilled in the art.

Further, in some embodiments of the present invention, the hardness of the first seal ring 3 is greater than the hardness of the second seal ring 4. So that the first seal ring 3, when rotating with the impeller 22, can score a shallow score, i.e. the annular groove 5, on the second seal ring 4 (as shown in figure 4).

In order to achieve the above object, the second sealing ring 4 of the present invention can be made of any feasible material, such as epoxy resin, phenolic resin, etc.

Preferably, when the magnetic suspension pump is assembled, the first sealing ring 3 and the second sealing ring 4 are in transition fit. When the maglev pump is powered on, the rotating shaft 12 drives the impeller 22 and the first sealing ring 3 to rotate, and the rotating first sealing ring 3 scratches a shallow scratch, i.e. an annular groove 5, on the second sealing ring 4 through the circumferential edge of the first sealing ring (as shown in fig. 4).

As can be appreciated by those skilled in the art, since the annular groove 5 on the second seal ring 4 is described by the rotating first seal ring 3, the clearance between the first radial seal ring 31 and the second radial seal ring 41 and the clearance between the first axial seal ring 32 and the second axial seal ring 42 are small enough (the partial area may even be 0). In other words, the annular groove 5 is created to accommodate the operation of the magnetic levitation pump, which not only saves production costs, but also allows the second sealing ring 4 to be sufficiently close to the first sealing ring 3 to provide a good seal for the pump 2, as compared to an annular groove machined by mechanical means.

Based on the foregoing description, it can be understood by those skilled in the art that the present invention can make the first seal ring 3, the impeller 22 and the rotating shaft 12 freely rotate relative to the second seal ring 4 by making an annular groove 5 on the second seal ring 4 during the rotation of the first seal ring 3, so that the pressure when the first seal ring 3 contacts with the second seal ring 4 is almost zero. Therefore, the first sealing ring 3 and the second sealing ring 4 of the utility model also improve the sealing performance of the pump 2 and prevent the leakage (including external leakage and internal leakage) of the fluid compressed in the pump 2 on the premise of ensuring the low-resistance operation of the magnetic suspension pump.

Further, the present invention also provides that the first seal ring 3 includes a first radial seal ring 31 and a first axial seal ring 32, and the second seal ring 4 includes a second radial seal ring 41 and a second axial seal ring 42, so that the first radial seal ring 31 and the second radial seal ring 41 can absorb the impact force in the radial direction when the rotating shaft 12 is powered off and limit the displacement in the radial direction of the rotating shaft 12, and the first axial seal ring 32 and the second axial seal ring 42 can absorb the impact force in the axial direction when the rotating shaft 12 is powered off and limit the displacement in the axial direction of the rotating shaft 12, and thus can prevent the rotating shaft 12 from deflecting.

Furthermore, in other embodiments of the present invention, a person skilled in the art may also provide only the first radial seal ring 31 and the second radial seal ring 41, or only the first axial seal ring 32 and the second axial seal ring 42, on the pump 2, as required.

Further, although not shown in the drawings, in other embodiments of the present invention, a refrigeration device is further provided, and the refrigeration device comprises the magnetic levitation pump. In the further exemplary embodiments of the utility model, the magnetic levitation pump is used as a compressor of a refrigeration system for compressing a refrigerant. The refrigeration appliance includes a refrigerator, freezer and/or freezer.

Still further, although not shown in the drawings, in still other embodiments of the present invention, an outdoor unit of an air conditioner is further provided, and the outdoor unit of the air conditioner includes the above-mentioned maglev pump. In the other embodiments of the present invention, the maglev pump is used as a compressor of an outdoor unit of an air conditioner for compressing a refrigerant.

So far, the technical solution of the present invention has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Without departing from the technical principle of the present invention, a person skilled in the art may split and combine the technical solutions in the above embodiments, and may make equivalent changes or substitutions for related technical features, and any changes, equivalents, improvements, etc. made within the technical concept and/or technical principle of the present invention will fall within the protection scope of the present invention.

Claims (10)

1. A magnetic suspension pump is characterized by comprising a motor, a pump, a first sealing ring and a second sealing ring,

the motor comprises a shell and a rotating shaft;

the pump comprises a pump shell and an impeller, the pump shell is fixedly connected with the machine shell or integrally manufactured, and the impeller is coaxially and fixedly connected with the rotating shaft;

one of the first seal ring and the second seal ring is provided on the pump housing or the casing, and the other of the first seal ring and the second seal ring is provided on the impeller,

the first and second seal rings mate and one of the first and second seal rings is delineated by the other with an annular groove.

2. A maglev pump according to claim 1,

the first sealing ring is an annular tooth, and the section of the annular tooth is wedge-shaped;

the second sealing ring is an annular sleeve, or the second sealing ring is composed of a plurality of semi-annular structures.

3. A maglev pump according to claim 2,

the second sealing ring corresponds to at least two first sealing rings.

4. A maglev pump according to claim 2,

the first seal ring has a hardness greater than a hardness of the second seal ring.

5. A magnetic levitation pump as recited in any one of claims 1-4,

the first seal ring includes a first axial seal ring and a first radial seal ring,

the second seal ring includes a second axial seal ring and a second radial seal ring,

the first axial seal ring mates with the second axial seal ring,

the first radial seal ring is mated with the second radial seal ring.

6. A maglev pump according to claim 5,

the pump shell comprises an inner volute and an outer volute, and the inner volute and the outer volute are respectively provided with at least one first sealing ring or at least one second sealing ring.

7. A magnetic levitation pump as recited in any one of claims 1-4,

the magnetic suspension pump comprises two pumps which are respectively arranged at two ends of the motor in the axial direction.

8. A maglev pump according to claim 7,

the pump is a centrifugal pump.

9. A refrigeration device, characterized in that it comprises a maglev pump according to any one of claims 1 to 8.

10. An outdoor unit of an air conditioner, comprising the maglev pump of any one of claims 1 to 8.

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