Magnetic levitation pump, refrigeration equipment having a magnetic levitation pump, and outdoor unit of an air conditioner

Abstract

The magnetic levitation pump includes a motor, a pump, a first seal ring, a second seal ring, and a buffer material. The motor includes a casing and a rotating shaft. The pump includes a pump housing and an impeller. The pump housing is fixedly connected to the casing or is manufactured integrally with the casing. The impeller is fixedly connected coaxially with the rotating shaft. The first seal ring is installed on the casing and / or the pump housing. The second seal ring is installed on the impeller and engages with the first seal ring, and when rotated, defines an annular groove in the first seal ring or the first seal ring defines an annular groove. The buffer material is installed between the first seal ring and the casing and / or the pump housing and is deformable along the axial direction of the first seal ring, and is installed between the second seal ring and the impeller and is deformable along the axial direction of the second seal ring.

Description

[Technical Field]

[0001] The present invention relates to the field of power devices, and in particular to a magnetic levitation pump, and an outdoor unit of a refrigeration appliance or an air conditioner having a magnetic levitation pump. [Background technology]

[0002] A magnetic levitation motor mainly includes a housing, a stator installed in the housing and fixedly connected to the housing, a rotating shaft installed in the stator, a radial magnetic levitation bearing for supporting the rotation of the rotating shaft, and an axial biasing force bearing for maintaining the axial position of the rotating shaft. The magnetic levitation motor further includes a protective bearing installed in the housing. This protective bearing is for supporting the stationary rotating shaft. When the magnetic levitation motor operates, current is applied to the radial magnetic levitation bearing, separating the rotating shaft from the protective bearing and causing it to levitate.

[0003] A magnetic levitation pump includes a magnetic levitation motor and a pump driven by the magnetic levitation motor. When the power supply to the magnetic levitation pump is cut off, the rotating shaft, which rotates at high speed, loses buoyancy and collides with the protective bearing, which is likely to be damaged. Summary of the Invention [Problem to be solved by the invention]

[0004] The purpose of the present invention is to overcome at least one technical drawback of the prior art and solve the problem that when the power supply to the magnetic levitation motor is cut off, the protective bearing of the conventional magnetic levitation pump is damaged by collision with the rotating shaft. [Means for solving the problem]

[0005] A further object of the present invention is to extend the useful life of the first seal ring and / or the second seal ring.

[0006] In order to achieve the above object, the present invention provides a magnetic levitation pump. a motor including a casing and a rotating shaft; a pump including a pump housing and an impeller, said pump housing being fixedly connected to or integrally manufactured with said casing, and said impeller being fixedly connected coaxially to said axis of rotation; a first seal ring installed in the casing and / or the pump housing; a second seal ring mounted on the impeller and fitted to the first seal ring, and which defines an annular groove in the first seal ring or has an annular groove defined by the first seal ring when rotated; a buffer material that is installed between the first seal ring and the casing and / or the pump housing and is deformable along the axial direction of the first seal ring, and a buffer material that is installed between the second seal ring and the impeller and is deformable along the axial direction of the second seal ring.

[0007] Preferably, the buffer material is a buffer ring having an annular structure, and is disposed between the first seal ring and the pump housing along the radial direction of the first seal ring, with the inner peripheral surface of the buffer ring abutting against the first seal ring and the outer peripheral surface of the buffer ring abutting against the pump housing.

[0008] Preferably, the buffer material is a spring, the spring being disposed between the first seal ring and the pump housing along the axial direction of the first seal ring, one axial end of the spring being connected to the first seal ring and the other axial end of the spring being connected to the pump housing.

[0009] Preferably, the springs abut against the first seal ring and the pump housing, respectively, and at least one of the springs abuts against each of two axial ends of the first seal ring.

[0010] Preferably, 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 fits into the second axial seal ring, and the first radial seal ring fits into the second radial seal ring. The first axial seal ring and the first radial seal ring each correspond to the buffer material.

[0011] Preferably, the first seal ring is an annular sleeve, and the second seal ring is an annular tooth, the cross section of which is wedge-shaped.

[0012] Preferably, the first seal ring has a lower hardness than the second seal ring.

[0013] Preferably, the pump is a centrifugal pump.

[0014] In addition, the present invention further provides a refrigeration apparatus, which includes the magnetic levitation pump of any of the above technical solutions.

[0015] Furthermore, the present invention further provides an outdoor unit of an air conditioner, which includes the magnetic levitation pump of any of the above technical solutions.

[0016] Based on the above description, those skilled in the art can understand that in the above technical solution of the present invention, a first seal ring is installed in the pump housing, a second seal ring is installed in the impeller, the first seal ring is fitted with the second seal ring, and one of the first seal ring and the second seal ring defines an annular groove with the other, thereby realizing a dynamic seal between the pump housing and the impeller by the first seal ring and the second seal ring, and further, the annular groove allows the impeller to rotate freely relative to the pump housing.

[0017] Those skilled in the art can further understand the following: Because the annular groove is defined by the first seal ring or the second seal ring (specifically, it is defined when the impeller rotates), the gap between the first seal ring and the second seal ring is small. Therefore, when the power to the motor is cut off, the first seal ring can first contact the second seal ring, and then the rotating shaft contacts the protective bearing. When the first seal ring and the second seal ring contact each other, the kinetic energy and momentum of the rotating shaft can be absorbed, reducing the impact force of the rotating shaft on the protective bearing and efficiently avoiding the risk of damage to the protective bearing.

[0018] Furthermore, by installing a buffer between the first seal ring and the casing and / or pump housing, and between the second seal ring and the impeller, when the impeller moves in the axial direction of the first seal ring, the first or second seal ring moves along with the impeller due to deformation of the buffer, which prevents the side walls of the annular groove from being continuously scraped by the first or second seal ring, further preventing the width of the annular groove from widening, and keeping the width of the annular groove small, thereby ensuring a sufficient gap between the first and second seal rings and extending the service life of the first and / or second seal rings.

[0019] Furthermore, since the first seal ring is provided as an annular tooth, the width of the annular groove can be made sufficiently small, thereby reducing the amount of fluid leaking from the pump housing to the outside.

[0020] Furthermore, by installing the first seal ring to include a first axial seal ring and a first radial seal ring, and installing the second seal ring to include a second axial seal ring and a second radial seal ring, the first axial seal ring and the second axial seal ring can absorb the axial impact force when current to the rotating shaft is cut off, thereby restricting axial displacement of the rotating shaft, and the first radial seal ring and the second radial seal ring can absorb the radial impact force when current to the rotating shaft is cut off, thereby restricting radial displacement of the rotating shaft, thereby preventing misalignment of the rotating shaft.

[0021] These 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 of the present invention taken in conjunction with the drawings. [Brief explanation of the drawings]

[0022] In order to more clearly explain the technical solution of the present invention, some embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the parts or portions represented by the same reference numerals in different accompanying drawings are the same or similar. The accompanying drawings of the present invention are not necessarily drawn to scale with each other. [Figure 1] 1 is a cross-sectional view of a magnetic levitation pump according to some embodiments of the present invention. [Figure 2] FIG. 2 is an enlarged view of part A in FIG. [Figure 3] FIG. 3 is an enlarged view of part B in FIG. 2. [Figure 4] FIG. 4 is an enlarged view of part C in FIG. [Figure 5] 10A-10C illustrate the effect of damping when the impeller is radially misaligned in some embodiments of the present invention. [Figure 6] 10A-10C illustrate the effect of damping when the impeller is axially misaligned in some embodiments of the present invention. [Figure 7] 10A and 10B are diagrams illustrating the effect of a buffer material in some other examples of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Reference will now be made in detail to the embodiments of the invention, one or more examples of which are illustrated in the drawings. Each embodiment is provided to illustrate the invention, not to limit it. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield still a further embodiment. Therefore, it is intended that the present invention include all such modifications and variations within the scope of the appended claims and their equivalents.

[0024] Those skilled in the art should understand that the embodiments described below are only some of the examples of the present invention, not all of the examples. These examples do not limit the scope of protection of the present invention, but are intended to explain the technical principles of the present invention. Based on the examples of the present invention, all other examples obtained without the need for creative activities by those skilled in the art fall within the scope of protection of the present invention.

[0025] It should be understood that in describing the present invention, directions or positional relationships indicated by terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer" do not indicate or imply a specific orientation that the device or component necessarily has, or a configuration or operation in a specific orientation, but are merely intended to facilitate explanation of the present invention based on the illustrated directions or positional relationships, and are not intended to limit the present invention. It should also be understood that the terms "first," "second," and "third" do not indicate or imply relative importance, but are merely for explanatory purposes.

[0026] Furthermore, in the description of the present invention, unless otherwise clearly specified or limited, the terms "attached," "coupled," and "connected" should be understood broadly, and may refer to, for example, fixed coupling, detachable coupling, integral coupling, mechanical coupling, electrical connection, direct coupling, indirect coupling via an intermediate medium, or internal communication between two members. Those skilled in the art can understand the meaning of the above terms in the present invention according to the specific circumstances.

[0027] Figure 1 is a cross-sectional view of a magnetic levitation pump according to some embodiments of the present invention. Figure 2 is an enlarged view of part A in Figure 1. Figure 3 is an enlarged view of part B in Figure 2. Figure 4 is an enlarged view of part C in Figure 3.

[0028] As shown in FIG. 1, in some embodiments of the present invention, a magnetic levitation pump includes a motor 1 and a pump 2. Preferably, the magnetic levitation pump includes two pumps 2, which are installed at both axial ends of the motor 1. Those skilled in the art may also install one pump 2 for the magnetic levitation pump as needed. That is, the pump 2 on the left or right side of the motor 1 in FIG. 1 may be omitted. Those skilled in the art may also connect at least two pumps 2 in series to the left or right side of the motor 1 as needed.

[0029] 1 , the motor 1 includes a casing 11, a rotating shaft 12, a radial magnetic levitation bearing 13, an axial magnetic levitation bearing 14, and a protective bearing 15. The rotating shaft 12 is rotatably installed within the casing 11. The radial magnetic levitation bearing 13, the axial magnetic levitation bearing 14, and the protective bearing 15 are fixedly installed inside the casing 11.

[0030] When the motor 1 is energized, there are gaps between the radial magnetic levitation bearing 13, the axial magnetic levitation bearing 14, and the protective bearing 15 and the rotating shaft 12. The radial gap between the radial magnetic levitation bearing 13 and the rotating shaft 12 is larger than the radial gap between the protective bearing 15 and the rotating shaft 12, and the radial gap between the axial magnetic levitation bearing 14 and the rotating shaft 12 is larger than the radial gap between the protective bearing 15 and the rotating shaft 12. As a result, when the motor 1 is de-energized, the rotating shaft 12 abuts against the protective bearing 15 without coming into contact with the radial magnetic levitation bearing 13 and / or the axial magnetic levitation bearing 14.

[0031] 1, a thrust disk 121 is installed on the rotating shaft 12. An axial magnetic levitation bearing 14 is installed on each side of the thrust disk 121. When the motor 1 is energized, there is a gap between the thrust disk 121 and each of the two axial magnetic levitation bearings 14.

[0032] In the present invention, both the radial magnetic levitation bearing 13 and the axial magnetic levitation bearing 14 include a coil and / or a member capable of generating a magnetic force when current is applied. The radial magnetic levitation bearing 13 and the axial magnetic levitation bearing 14 are components commonly used in this field and are commercially available, so further explanation will be omitted in this specification.

[0033] Continuing to refer to FIG. 1 , the pump 2 includes a pump housing 21 and an impeller 22. The pump housing 21 is fixedly connected to or manufactured integrally with the casing 11. The impeller 22 is fixedly connected coaxially to the rotary shaft 12. When the rotary shaft 12 rotates, the impeller 22 rotates synchronously. Furthermore, the pump housing 21 is provided with a supply port 201 and a discharge port 202. The rotating impeller 22 creates a negative pressure within the pump housing 21. This allows external fluid to flow into the pump housing 21 through the supply port 201, and allows fluid within the pump housing 21 to flow out of the pump housing 21 through the discharge port 202.

[0034] Although not shown, in some embodiments of the present invention, pump 2 is a centrifugal pump and impeller 22 is a centrifugal impeller. Of course, those skilled in the art will appreciate that in other embodiments of the present invention, pump 2 may be implemented as any other form of pump, such as a plunger pump, gear pump, vane pump, rotary pump, etc., as desired.

[0035] 1, the pump housing 21 includes an inner volute case 211 and an outer volute case 212. The inner volute case 211 and the outer volute case 212 are connected to each other by screws or bolts. The inner volute case 211 is connected to the casing 11 by screws or bolts.

[0036] As shown in FIGS. 2 and 3 , in some embodiments of the present invention, the magnetic levitation pump further includes a first seal ring 3, a second seal ring 4, and a buffer material 5. The first seal ring 3 and the second seal ring 4 are fitted together. The first seal ring 3 is mounted on the casing 11 and / or the pump housing 21. The second seal ring 4 is mounted on the impeller 22 and defines an annular groove 6 in the first seal ring 3 when rotated, or the first seal ring 3 defines the annular groove 6. The buffer material 5 is mounted between the first seal ring 3 and the casing 11 and / or the pump housing 21 and is deformable along the axial direction of the first seal ring 3, and is mounted between the second seal ring 4 and the impeller 22 and is deformable along the axial direction of the second seal ring 4.

[0037] Also, those skilled in the art may install the first seal ring 3 on the impeller 22 and the second seal ring 4 on the pump housing 21 as needed.

[0038] Furthermore, those skilled in the art may install the buffer material 5 between the second seal ring 4 and the pump housing 21, or may install the buffer material 5 only between the second seal ring 4 and the pump housing 21, as necessary.

[0039] Preferably, as shown in Figures 2 and 3, 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, with the first radial seal ring 31 fitted to the second radial seal ring 41 and the first axial seal ring 32 fitted to the second axial seal ring 42.

[0040] 2 and 3, a first radial seal ring 31 and a first axial seal ring 32 are preferably installed in the inner volute case 211 and the outer volute case 212, respectively. Furthermore, those skilled in the art may install the first radial seal ring 31 and the first axial seal ring 32 only in the inner volute case 211 or the outer volute case 212, as necessary, or may install the first radial seal ring 31 in one of the inner volute case 211 or the outer volute case 212, and install the first axial seal ring 32 in the other of the inner volute case 211 or the outer volute case 212.

[0041] As can be seen from the drawings, there may be a plurality of second radial seal rings 41 and a plurality of second axial seal rings 42, with the first radial seal ring 31 corresponding to a plurality of second radial seal rings 41 and the first axial seal ring 32 corresponding to a plurality of second axial seal rings 42. Those skilled in the art will appreciate that matching the first seal ring 3 to a plurality of second seal rings 4 reduces stress between the second seal ring 4 and the first seal ring 3 and prevents excessive wear between the second seal ring 4 and the first seal ring 3. Furthermore, matching the first seal ring 3 to a plurality of second seal rings 4 forms multiple seals between the second seal ring 4 and the first seal ring 3, preventing fluid leakage from within the pump housing 21.

[0042] Although not shown, the first seal ring 3 may be an annular sleeve or may have a structure including multiple semicircular arcs. That is, the first radial seal ring 31 and / or the first axial seal ring 32 may be an annular sleeve or may have a structure including multiple semicircular arcs.

[0043] Furthermore, although not shown, the second seal ring 4 is annularly toothed. That is, both the second radial seal ring 41 and the second axial seal ring 42 are annularly toothed. Preferably, the cross section of the annular tooth is wedge-shaped (as shown in FIG. 4).

[0044] Preferably, the second radial seal ring 41 and the second axial seal ring 42 are molded integrally with the impeller 22. Furthermore, a person skilled in the art may fix the second radial seal ring 41 and the second axial seal ring 42 to the impeller 22 by a connection method such as screwing, welding, interference fit, or screw fastening, and may selectively install a buffer material 5 between the second radial seal ring 41 and the impeller 22 and / or between the second axial seal ring 42 and the impeller 22, as needed.

[0045] Furthermore, in some embodiments of the present invention, the hardness of the first seal ring 3 is less than the hardness of the second seal ring 4, so that the second seal ring 4 defines a shallow scratch, i.e., annular groove 6 (shown in FIG. 4), in the first seal ring 3 as the impeller 22 rotates.

[0046] To achieve the above object, the first seal ring 3 of the present invention may be made of any possible material, such as epoxy resin or novolac resin.

[0047] Preferably, when the magnetic levitation pump of the present invention is installed, the first seal ring 3 and the second seal ring 4 are connected by an intermediate spring. When the magnetic levitation pump is energized, the rotating shaft 12 rotates the impeller 22 and the second seal ring 4, and the rotating second seal ring 4 defines a shallow scratch, i.e., annular groove 6 (shown in FIG. 4), in the first seal ring 3 with its peripheral portion.

[0048] Those skilled in the art will understand that because the annular groove 6 of the first seal ring 3 is defined by the rotating second seal ring 4, the gap between the first radial seal ring 31 and the second radial seal ring 41 and the gap between the first axial seal ring 32 and the second axial seal ring 42 are sufficiently small (some areas may even be zero). In other words, the annular groove 6 is formed to suit the operation of the magnetic levitation pump, and in addition to reducing manufacturing costs compared to annular grooves machined by machine equipment, it also sufficiently tightens the fit between the second seal ring 4 and the first seal ring 3 and provides excellent sealing for the pump 2.

[0049] Based on the above explanation, those skilled in the art will understand the following: In the present invention, by defining the annular groove 5 in the first seal ring 3 during the process of rotating the second seal ring 4, the pressure when the first seal ring 3 contacts the second seal ring 4 is almost zero. This allows the second seal ring 4, impeller 22, and rotating shaft 12 to rotate freely relative to the first seal ring 3. Therefore, the first seal ring 3 and second seal ring 4 of the present invention improve the sealing performance of the pump 2 while ensuring low-resistance operation of the magnetic levitation pump, and prevent leakage of compressed fluid within the pump 2 (including leakage inward and outward).

[0050] Furthermore, in the present invention, the first seal ring 3 is installed to include a first radial seal ring 31 and a first axial seal ring 32, and the second seal ring 4 is installed to include a second radial seal ring 41 and a second axial seal ring 42. As a result, the first radial seal ring 31 and the second radial seal ring 41 absorb the radial impact force when power is cut off to the rotating shaft 12, thereby restricting radial displacement of the rotating shaft 12, and the first axial seal ring 32 and the second axial seal ring 42 absorb the axial impact force when power is cut off to the rotating shaft 12, thereby restricting axial displacement of the rotating shaft 12, thereby preventing displacement of the rotating shaft 12.

[0051] In addition, in other embodiments of the present invention, a person skilled in the art may install only the first radial seal ring 31 and the second radial seal ring 41 in the pump 2, or only the first axial seal ring 32 and the second axial seal ring 42, as required.

[0052] 2 and 3, in some embodiments of the present invention, the buffer material 5 is a buffer ring 51 having an annular structure. Furthermore, the buffer ring 51 is installed between the first seal ring 3 and the pump housing 21 along the radial direction of the first seal ring 3. The inner peripheral surface of the buffer ring 51 abuts against the first seal ring 3, and the outer peripheral surface of the buffer ring 51 abuts against the pump housing 21.

[0053] Specifically, at least one buffer ring 51 is installed between the first radial seal ring 31 and the pump housing 21, and between the first axial seal ring 32 and the pump housing 21. Alternatively, a person skilled in the art may install a buffer ring 51 only between the first radial seal ring 31 and the pump housing 21, or may install a buffer ring 51 only between the first axial seal ring 32 and the pump housing 21, as needed.

[0054] Furthermore, in some embodiments of the present invention, the buffer ring 51 is made of an elastic material and is deformable in the axial and / or radial direction of the first seal ring 3. It should be noted that the elastic material may be any possible material, such as rubber, silicone, plastic, etc.

[0055] Deformation of the buffer ring 51 will be described in detail below with reference to Figures 5 and 6. Figure 5 is a diagram showing the effect of the buffer material when the impeller is displaced in the radial direction in some embodiments of the present invention, and Figure 6 is a diagram showing the effect of the buffer material when the impeller is displaced in the axial direction in some embodiments of the present invention.

[0056] As shown in Fig. 5, when the impeller 22 moves radially from its normal rotation position (a position coaxial with the protective bearing 15) in the direction indicated by the arrow in Fig. 5, the second radial seal ring 41 presses the first radial seal ring 31 along its radial direction, and the first radial seal ring 31 presses the corresponding buffer ring 51 in the direction indicated by the arrow in Fig. 5, causing radial deformation (thinning) of the corresponding portion of the buffer ring 51. Furthermore, the second axial seal ring 42 presses the first axial seal ring 32 along its axial direction (specifically, the second axial seal ring 42 presses the side wall of the annular groove 6 of the first axial seal ring 32 with its circumferential edge), and the first axial seal ring 32 presses the corresponding buffer ring 51 in the direction indicated by the arrow in Fig. 5, causing axial deformation of the corresponding portion of the buffer ring 51.

[0057] As shown in Fig. 6, when the impeller 22 moves axially from its normal rotation position in the direction indicated by the arrow in Fig. 6, the second radial seal ring 41 presses the first radial seal ring 31 along its axial direction (specifically, the second radial seal ring 41 presses the side wall of the annular groove 6 of the first radial seal ring 31 with its circumferential edge), and the first radial seal ring 31 presses the corresponding buffer ring 51 in the direction indicated by the arrow in Fig. 6, causing axial deformation in the corresponding portion of the buffer ring 51. Furthermore, the second axial seal ring 42 presses the first axial seal ring 32 along its radial direction, and the first axial seal ring 32 presses the corresponding buffer ring 51 in the direction indicated by the arrow in Fig. 6, causing radial deformation and thinning in the corresponding portion of the buffer ring 51.

[0058] From the above explanation, those skilled in the art will understand that, with the installation of buffer ring 51, when impeller 22 moves radially or axially, first radial seal ring 31 and first axial seal ring 32 move along with impeller 22 due to deformation of buffer ring 51, preventing the side walls of annular groove 6 of second radial seal ring 41 and second axial seal ring 42 from being continuously scraped by first radial seal ring 31 and first axial seal ring 32, further preventing the width of annular groove 6 from widening, keeping the width of annular groove 6 small, ensuring a sufficient gap between first seal ring 31 and second seal ring 4, and extending the service life of first seal ring 3.

[0059] Those skilled in the art will further understand that the buffer ring 51 absorbs the impact of the rotating shaft 12 and the impeller 22 during deformation, so that the buffer ring 51 can reduce the impact of the rotating shaft 12 on the protective bearing 15, thereby extending the service life of the protective bearing 15.

[0060] FIG. 7 is a diagram showing the effect of the buffer material in some other embodiments of the present invention.

[0061] 7, in some other embodiments of the present invention, the buffer material 5 is a spring 52. The spring 52 is installed between the first seal ring 3 and the pump housing 21 along the axial direction of the first seal ring 3. Furthermore, one axial end of the spring 52 is connected to the first seal ring 3, and the other axial end of the spring 52 is connected to the pump housing 21. This connection may be a hook connection or an abutting connection.

[0062] Specifically, the springs 52 abut against the first seal ring 3 and the pump housing 21, respectively, and at least one spring 52 abuts against each of the two axial ends of the first seal ring 3.

[0063] More specifically, one spring 52 abuts on each of the axial ends of the first radial seal ring 31, and one end of the spring 52 remote from the first radial seal ring 31 abuts on the pump housing 21. One spring 52 abuts on each of the axial ends of the first axial seal ring 32, and one end of the spring 52 remote from the first axial seal ring 32 abuts on the pump housing 21. Alternatively, a person skilled in the art could, if necessary, provide only one spring 52 for the first radial seal ring 31 and / or the first axial seal ring 32, and fixedly connect one end of the spring 52 to the first radial seal ring 31 and / or the first axial seal ring 32, and fixedly connect the other end of the spring 52 to the pump housing 21.

[0064] Preferably, the first radial seal ring 31 is slidable relative to the pump housing 21 along its axial direction, and the first axial seal ring 32 is also slidable relative to the pump housing 21 along its axial direction.

[0065] Furthermore, when the impeller 22 is displaced radially from its operating position (its center of rotation is coaxial with the center of rotation of the protective bearing 15), the second axial seal ring 42 presses the first axial seal ring 32 along its axial direction (specifically, the second axial seal ring 42 presses the side wall of the annular groove 6 of the first axial seal ring 32 with its circumferential edge), and the first axial seal ring 32 presses and compresses the corresponding spring 52.

[0066] When the impeller 22 is displaced axially from its operating position, the second radial seal ring 41 presses the first radial seal ring 31 along its axial direction (specifically, the second radial seal ring 41 presses the side wall of the annular groove 6 of the first radial seal ring 31 with its circumferential edge), and the first radial seal ring 31 presses and compresses the corresponding spring 52.

[0067] In other embodiments of the present invention, those skilled in the art may install the buffer material 5 in any other possible structure, for example, as a plurality of arc-shaped plate members, as needed. These arc-shaped plate members are installed between the first seal ring 3 and the pump housing 21 along the radial direction of the first seal ring 3. Furthermore, the inner peripheral surface of each plate member abuts against the first seal ring 3, and the outer peripheral surface of each plate member abuts against the pump housing 21.

[0068] Furthermore, although not shown, some other embodiments of the present invention provide a refrigeration system. The refrigeration system includes the magnetic levitation pump of any of the above embodiments. In some other embodiments of the present invention, the magnetic levitation pump is used as a compressor in the refrigeration system to compress a refrigerant. The refrigeration system includes a refrigerator, a freezer, and a cooler box.

[0069] Furthermore, although not shown, some other embodiments of the present invention further provide an outdoor unit of an air conditioner, which includes the magnetic levitation pump of any of the above embodiments. In some other embodiments of the present invention, the magnetic levitation pump is used as a compressor in the outdoor unit of the air conditioner and is used to compress a refrigerant.

[0070] Although the technical solutions of the present invention have been described above in conjunction with the above-mentioned embodiments, those skilled in the art can easily understand that the protection scope of the present invention is not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art may divide or combine the technical solutions in the above-mentioned embodiments, or make equivalent modifications or substitutions to the relevant technical features, and any modifications, equivalent substitutions, or improvements within the technical idea and / or technical principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A magnetic levitation pump, a motor including a casing and a rotating shaft; a pump including a pump housing and an impeller, said pump housing being fixedly connected to or integrally manufactured with said casing, and said impeller being fixedly connected coaxially to said axis of rotation; a first seal ring disposed on the casing and / or the pump housing; a second seal ring mounted on the impeller and fitted to the first seal ring, the second seal ring rotating to define an annular groove in the first seal ring or having an annular groove defined by the first seal ring; a buffer material disposed between the first seal ring and the casing and / or the pump housing and deformable along the axial direction of the first seal ring, and disposed between the second seal ring and the impeller and deformable along the axial direction of the second seal ring, 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 is fitted to the second axial seal ring; the first radial seal ring is fitted to the second radial seal ring; the first axial seal ring and the first radial seal ring each correspond to the buffer material; Furthermore, the first radial seal ring and the second radial seal ring are configured to absorb a radial impact force when current supply to the rotating shaft is cut off, thereby restricting radial displacement of the rotating shaft, and the first axial seal ring and the second axial seal ring are configured to absorb an axial impact force when current supply to the rotating shaft is cut off, thereby restricting axial displacement of the rotating shaft, When the impeller moves in the radial direction of the rotating shaft, the cushioning material corresponding to the first radial seal ring deforms in the radial direction of the rotating shaft due to the pressure of the first radial seal ring, and the cushioning material corresponding to the first axial seal ring deforms in the radial direction of the rotating shaft due to the pressure of the first axial seal ring; when the impeller moves in the axial direction of the rotating shaft, the cushioning material corresponding to the first radial seal ring deforms in the axial direction of the rotating shaft due to the pressure of the first radial seal ring, and the cushioning material corresponding to the first axial seal ring deforms in the axial direction of the rotating shaft due to the pressure of the first axial seal ring. A magnetic levitation pump characterized by:

2. the buffer material is a buffer ring having an annular structure, and is disposed between the first seal ring and the pump housing along a radial direction of the first seal ring; an inner circumferential surface of the buffer ring abuts against the first seal ring; 2. The magnetic levitation pump according to claim 1, wherein the outer peripheral surface of the buffer ring abuts against the pump housing.

3. the buffer material is a spring, the spring is disposed between the first seal ring and the pump housing along the axial direction of the first seal ring; One axial end of the spring is connected to the first seal ring; 2. The magnetic levitation pump according to claim 1, wherein the other axial end of the spring is connected to the pump housing.

4. the spring abuts against the first seal ring and the pump housing, respectively; 4. The magnetic levitation pump according to claim 3, wherein at least one of the springs abuts against each of two axial ends of the first seal ring.

5. the first seal ring is an annular sleeve; the second seal ring is an annular tooth; 2. The magnetic levitation pump according to claim 1, wherein the cross section of said annular teeth is wedge-shaped.

6. 2. The magnetic levitation pump according to claim 1, wherein the first seal ring has a lower hardness than the second seal ring.

7. 7. The magnetic levitation pump according to claim 6, wherein the pump is a centrifugal pump.

8. A refrigeration device comprising: A refrigeration device comprising the magnetic levitation pump according to any one of claims 1 to 7.

9. An outdoor unit of an air conditioner, An outdoor unit of an air conditioner, comprising the magnetic levitation pump according to any one of claims 1 to 7.

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