An impeller structure and a pump

Abstract

This invention provides an impeller structure and a pump. The impeller structure includes an impeller assembly, an impeller sealing ring, and a dynamic balancing component. The impeller assembly includes a cover plate and an impeller. The impeller is disposed on the cover plate, and the impeller sealing ring is sleeved on the outer side of the cover plate. Multiple dynamic balancing components are provided between the cover plate and the impeller sealing ring, and these components are spaced apart around the axis of the impeller. The dynamic balancing component is provided corresponding to each of the dynamic balancing components. This impeller structure and pump, by providing an impeller sealing ring on the cover plate to seal the impeller assembly against external fluid to reduce leakage, and further by providing a dynamic balancing component corresponding to each of the dynamic balancing components, achieves dynamic balance adjustment of the impeller assembly while simultaneously satisfying the assembly requirements of the impeller sealing ring and the cover plate.

Description

Technical Field

[0001] This invention relates to the field of impeller structure technology, and in particular to an impeller structure and a pump. Background Technology

[0002] During the operation of a centrifugal pump, there are axial clearances between the impeller and the volute, and between the rear cover plate and the pump cover. After the fluid is pressurized by the impeller, a pressure difference exists between the front and rear cover plates, forming an axial force source for the impeller. The high-pressure fluid then flows back from the impeller outlet to the impeller inlet, causing volumetric losses in the pump. Therefore, a sealing ring is needed to reduce the radial clearances between the volute and the impeller, and between the pump cover and the impeller, in order to reduce the internal backflow of the centrifugal pump, reduce the axial force of the impeller, and balance the axial force. During the sealing process, due to the small clearances and the scouring of the high-pressure fluid, the sealing ring is prone to wear and is considered a wear part. This requires that the sealing ring be easy to replace and be integrated with the impeller to achieve a good dynamic balance effect, eliminating the impact on the bearings.

[0003] For example, Chinese utility model patent CN203532314U discloses a labyrinth-type impeller sealing ring gap structure, belonging to the category of centrifugal pump impeller sealing ring gap throttling structures. Existing products have excessive leakage during pressure reduction and throttling, affecting pump efficiency. This invention includes an impeller sealing ring and a pump body sealing ring. The impeller sealing ring is assembled on the impeller, and the pump body sealing ring is fixed to the pump body correspondingly to the impeller sealing ring, maintaining a gap between them. The inner circular surface of the pump body sealing ring is provided with a rectangular toothed ring structure. This significantly reduces leakage at both ends of the impeller sealing ring gap during centrifugal pump operation, improving pump volumetric efficiency and thus increasing pump efficiency. This saves operating costs for pump users and improves economic benefits.

[0004] The aforementioned existing technologies have the following problems in application:

[0005] Impeller dynamic balancing involves locally adding or removing a portion of the weight to adjust the impeller's center of mass as close as possible to the impeller shaft center. Existing impellers can be dynamically balanced by correcting the dynamic balance on the cover plate side; however, if the cover plate thickness is insufficient, the conditions for impeller dynamic balancing cannot be met.

[0006] In summary, there is an urgent need for an impeller structure and pump that can meet the dynamic balance adjustment of the impeller when the cover plate thickness is insufficient. Summary of the Invention

[0007] To address the problem that existing impellers cannot meet the dynamic balance adjustment conditions when the cover plate thickness is insufficient, this invention provides an impeller structure and a pump.

[0008] According to one objective of the present invention, an impeller structure is provided, comprising:

[0009] An impeller assembly, the impeller assembly including a cover plate and an impeller, the impeller being disposed on the cover plate;

[0010] An impeller sealing ring is sleeved on the outer side of the cover plate. A plurality of dynamic balancing correction parts are provided between the cover plate and the impeller sealing ring. The plurality of dynamic balancing correction parts are arranged at intervals around the axis of the impeller.

[0011] A dynamic balancing correction component is provided corresponding to the dynamic balancing part. The cover plate and the impeller sealing ring are detachably connected through the dynamic balancing correction component. The dynamic balancing correction component is also configured to adjust the balance of the impeller assembly.

[0012] Preferably, the dynamic balancing correction section is a groove-shaped dynamic balancing correction section, and the dynamic balancing correction component is screwed into the dynamic balancing correction section.

[0013] Preferably, a first mounting groove is formed on the inner circular surface of the impeller sealing ring, and one end of the first mounting groove is exposed on the outer end surface of the impeller sealing ring;

[0014] A second mounting groove is provided on the outer side of the cover plate, and one end of the second mounting groove is exposed on the outer end surface of the cover plate;

[0015] The first mounting groove and the second mounting groove form the dynamic balance correction section.

[0016] Preferably, the axial direction of the dynamic balancing correction part is parallel to the axial direction of the impeller sealing ring, and the dimension of the dynamic balancing correction part in the axial direction is not greater than the dimension of the impeller sealing ring in the axial direction, and not less than half of the dimension of the impeller sealing ring in the axial direction.

[0017] Preferably, the cover plate includes a connecting section and an installation section arranged sequentially along the axial direction. The radial dimension of the connecting section gradually decreases as it approaches the installation section. The maximum radial dimension of the installation section is smaller than the minimum radial dimension of the connecting section, so as to form a stepped surface between the connecting section and the installation section. The impeller sealing ring is sleeved on the outer side of the installation section. The impeller sealing ring and the installation section are tightly fitted, and the impeller sealing ring abuts against the stepped surface.

[0018] Preferably, a labyrinth element is provided on the outer circumferential surface of the impeller sealing ring, and the labyrinth element is a toothed or grooved labyrinth element.

[0019] Preferably, the labyrinth component is arranged around the axis of the impeller sealing ring, and there are multiple labyrinth components, which are arranged sequentially at intervals along the axial direction of the impeller sealing ring.

[0020] Preferably, the impeller assembly further includes:

[0021] The hub has two cover plates, a front cover plate and a rear cover plate, which are arranged at intervals. The hub is located between the front cover plate and the rear cover plate. The impeller is connected between the front cover plate and the hub, and between the rear cover plate and the hub.

[0022] A guide plate is connected between the outer periphery of the front cover plate and the outer periphery of the rear cover plate. There are multiple guide plates, and adjacent guide plates form an outlet that connects the inside and outside of the impeller assembly.

[0023] Preferably, the guide vane includes a front guide vane and a rear guide vane, wherein the front cover plate, the front guide vane, the rear guide vane and the rear cover plate are connected sequentially along the axial direction of the impeller, wherein the connection between the front guide vane and the rear guide vane is bent in a manner close to the impeller.

[0024] The present invention also provides a pump, including the above-described impeller structure, and further comprising:

[0025] The pump body includes a pump casing that interlocks with each other to form a cavity, an impeller structure disposed in the cavity, wherein the axis of the impeller structure coincides with the axis of the cavity, and the outer circular surface of the impeller sealing ring and the inner wall of the cavity are arranged at intervals relative to each other in the radial direction of the cavity;

[0026] The power source is provided on the outer side of the pump housing, and the power source is mounted on the power mounting end face.

[0027] A rotating shaft, one end of which is connected to the power source, and the other end of which is connected to the impeller assembly.

[0028] The pump also includes:

[0029] A pump body sealing ring is installed on the inner wall of the cavity. The pump body sealing ring includes a first ring portion, and the first ring portion and the impeller sealing ring have a pre-reserved gap in the radial direction of the cavity.

[0030] Preferably, the pump body sealing ring further includes:

[0031] The second ring portion is formed by sequentially connecting the first ring portion and the second ring portion along the axial direction of the impeller. The second ring portion extends toward the center of the cavity so that it blocks the gap in the axial direction of the cavity.

[0032] Preferably, a connecting rib is provided on the side of the second ring portion away from the center of the cavity, and a rib groove is provided on the inner wall of the cavity, with the connecting rib embedded in the rib groove.

[0033] Preferably, the power source is an axial magnetic field motor.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] This impeller structure and pump, by setting an impeller sealing ring on the cover plate, seals the external fluid of the impeller assembly to reduce leakage, and further sets a dynamic balancing correction component, which is correspondingly set on the dynamic balancing correction part. While satisfying the assembly between the impeller sealing ring and the cover plate, the dynamic balance of the impeller assembly is adjusted. Thus, even when the cover plate thickness is insufficient, the dynamic balance adjustment of the impeller assembly can be satisfied.

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0037] Figure 1 This is a cross-sectional schematic diagram of one embodiment of the impeller structure and pump described in this invention;

[0038] Figure 2 The impeller structure and pump described in this invention Figure 1 Enlarged diagram of point A in the diagram;

[0039] Figure 3 This is a schematic diagram from one perspective of the impeller structure and the connection between the dynamic balancing correction component and the dynamic balancing correction part in the pump according to the present invention.

[0040] Figure 4 This is another schematic diagram of the impeller structure and the connection between the dynamic balancing correction component and the dynamic balancing correction part in the pump described in this invention.

[0041] Figure 5 This is a schematic diagram of an impeller structure and pump impeller assembly according to the present invention.

[0042] Figure 6 This is a schematic diagram of an impeller structure and a pump impeller sealing ring according to the present invention.

[0043] In the diagram: 100, impeller assembly; 101, cover plate; 101a, front cover plate; 101b, rear cover plate; 1011, connecting section; 1012, mounting section; 1013, stepped surface; 102, impeller; 103, hub; 104, guide vane; 1041, front guide vane; 1042, rear guide vane; 200, impeller sealing ring; 300, dynamic balancing correction section; 301, first mounting groove; 302, second mounting groove. 400, balancing component; 600, pump body; 601, power mounting end face; 602, cavity; 6021, first impeller inlet; 6022, second impeller inlet; 603, pump casing; 700, power source; 800, rotating shaft; 900, pump body sealing ring; 901, first ring; 902, second ring; 903, connecting rib; 904, rib groove; 1000, gap; 1100, labyrinth component. Detailed Implementation

[0044] The following description is intended to provide a detailed account of the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0045] First Embodiment

[0046] Please see Figure 1-6 The present invention provides a technical solution: an impeller structure, comprising:

[0047] Impeller assembly 100 includes a cover plate 101 and an impeller 102, with the impeller 102 disposed on the cover plate 101;

[0048] Impeller sealing ring 200 is sleeved on the outer side of cover plate 101. Multiple dynamic balance correction parts 300 are provided between cover plate 101 and impeller sealing ring 200. The multiple dynamic balance correction parts 300 are arranged at intervals around the axis of impeller 102.

[0049] A dynamic balancing correction component 400 is provided corresponding to the dynamic balancing correction part 300. The cover plate 101 and the impeller sealing ring 200 are detachably connected through the dynamic balancing correction component 400. At the same time, the dynamic balancing correction component 400 is set to be suitable for adjusting the balance of the impeller assembly 100.

[0050] By providing an impeller sealing ring 200 on the cover plate 101, the impeller sealing ring 200 seals the external fluid of the impeller assembly 100 to reduce leakage. Furthermore, a dynamic balancing correction component 400 is provided and correspondingly positioned on the dynamic balancing correction part 300. This satisfies the assembly requirements between the impeller sealing ring 200 and the cover plate 101 while simultaneously adjusting the dynamic balance of the impeller assembly 100. Thus, even when the thickness of the cover plate 101 is insufficient, the dynamic balance adjustment of the impeller assembly 100 can still be achieved.

[0051] It should be noted that for precision machinery like impellers, adjusting the dynamic balance on the cover plate 101 side can damage the hydraulic performance of the impeller assembly 100, and the thickness of the cover plate 101 may not meet the conditions for fine-tuning the dynamic balance. Therefore, this technical solution uses a dynamic balancing correction component 400 in conjunction with the impeller assembly 100 to fine-tune the dynamic balance. The specific method for adjusting the dynamic balance on the impeller assembly 100 is to remove or choose not to install the dynamic balancing correction component 400 on part of the dynamic balancing correction part 300, thereby adjusting the local weight of the impeller assembly 100 and thus adjusting the dynamic balance of the impeller assembly 100. The above adjustment is carried out on the premise that the dynamic balancing correction component 400 can stably connect the impeller sealing ring 200 and the cover plate 101.

[0052] Regarding the dynamic balancing correction part 300, in one embodiment of the present invention, the dynamic balancing correction part 300 includes a first groove and a second groove. The first groove is formed on the outer end face of the cover plate 101, and the second groove is formed on the outer circular surface of the impeller sealing ring 200. The dynamic balancing correction part 400 is an elastic dynamic balancing correction part. The two ends of the dynamic balancing correction part 400 in the length direction are respectively fastened into the first groove and the second groove, so that the impeller sealing ring 200 and the outer side surface of the cover plate 101 are tightly fitted.

[0053] As one preferred option, the dynamic balancing correction component 400 is a dynamic balancing correction component made of spring steel.

[0054] In another embodiment of the present invention, the dynamic balancing correction part 300 is a groove-shaped dynamic balancing correction part, and the dynamic balancing correction component 400 is screwed into the dynamic balancing correction part 300.

[0055] As one preferred embodiment, the balancing correction component 400 is a set screw, and the dynamic balancing correction part 300 is a set screw hole.

[0056] The number of set screw holes and the screw size and specifications are not limited to the above.

[0057] As one preferred embodiment, the number of dynamic balancing correction units 300 is eight, and the dynamic balancing correction units 300 are arranged at equal intervals around the axis of the impeller 102 so that the dynamic balance of the impeller assembly 100 can be adjusted at different angles.

[0058] Regarding the specific structure of the impeller assembly 100, in one embodiment of the invention, the impeller assembly 100 is a double-suction impeller, specifically, as follows: Figure 1 and Figure 2 As shown, the impeller assembly 100 also includes:

[0059] The hub 103 has two cover plates 101, namely a front cover plate 101a and a rear cover plate 101b. The front cover plate 101a and the rear cover plate 101b are arranged at intervals relative to each other. The hub 103 is located between the front cover plate 101a and the rear cover plate 101b. The impeller 102 is connected between the front cover plate 101a and the hub 103, and between the rear cover plate 101b and the hub 103.

[0060] A guide plate 104 is connected between the outer periphery of the front cover plate 101a and the outer periphery of the rear cover plate 101b. There are multiple guide plates 104. Adjacent guide plates 104 form an outlet that connects the inside and outside of the impeller assembly 100. The inner wall of the cover plate 101 forms an inlet that connects the inside and outside of the impeller assembly 100. Specifically, the inner wall of the front cover plate 101a forms a first inlet that connects the inside and outside of the impeller assembly 100, and the inner wall of the rear cover plate 101b forms a second inlet that connects the inside and outside of the impeller assembly 100.

[0061] For more details, see Figure 5 The guide vane 104 includes a front guide vane 1041 and a rear guide vane 1042. The front cover plate 101a, the front guide vane 1041, the rear guide vane 1042 and the rear cover plate 101b are connected sequentially along the axial direction of the impeller 102, wherein the connection between the front guide vane 1041 and the rear guide vane 1042 is bent in a manner close to the impeller 102.

[0062] To make the impeller sealing ring 200 and impeller assembly 100 more compact after installation, and to avoid the installation of the balance correction component 400, which would increase the resistance of the impeller assembly 100 during operation and thus damage the hydraulic performance of the impeller assembly 100.

[0063] Furthermore, such as Figure 3 and Figure 4 As shown, a first mounting groove 301 is provided on the inner circular surface of the impeller sealing ring 200, and one end of the first mounting groove 301 is exposed on the outer end surface of the impeller sealing ring 200.

[0064] A second mounting groove 302 is provided on the outer side of the cover plate 101, and one end of the second mounting groove 302 is exposed on the outer end face of the cover plate 101;

[0065] The first mounting slot 301 and the second mounting slot 302 form a dynamic balancing correction section 300.

[0066] Preferably, the first mounting groove 301 has a semi-circular cross-section, and the second mounting groove 302 has a semi-circular cross-section.

[0067] By dividing the dynamic balancing correction unit 300 into a first mounting groove 301 and a second mounting groove 302, and setting the first mounting groove 301 on the inner circular surface of the impeller sealing ring 200 and the second mounting groove 302 on the outer surface of the cover plate 101, the balancing correction component 400 does not occupy the external space of the impeller assembly 100 when used in conjunction with the dynamic balancing correction unit 300. This makes the structure of the impeller sealing ring 200 and the impeller assembly 100 more compact after installation, avoids damaging the hydraulic performance of the impeller assembly 100, and helps to reduce the resistance during the movement of the impeller assembly 100 and improve the energy conversion efficiency.

[0068] The above solution integrates the cover plate 101 and the impeller sealing ring 200 into a dynamic balance. The cover plate 101 and the impeller sealing ring 200 are fitted with set screw holes on their sides. While ensuring a tight fit between the cover plate 101 and the impeller sealing ring 200, the imbalance will be further reduced, thus achieving the effect of fine adjustment.

[0069] Furthermore, such as Figure 3 As shown, the outer end face of the balancing correction component 400, the outer end face of the cover plate 101, and the outer end face of the impeller sealing ring 200 are flush. This is to prevent the balancing correction component 400 from extending beyond the cover plate 101 or to avoid a height difference between the balancing correction component 400 and the cover plate 101, which would increase the resistance during the movement of the impeller assembly 100.

[0070] It should be noted that the outer end face of the cover plate 101 refers to the two end faces along the axial direction of the cover plate 101, and the outer end face of the impeller sealing ring 200 refers to the two end faces along the axial direction of the impeller sealing ring 200.

[0071] Furthermore, Figure 1 and Figure 2 As shown, the cover plate 101 includes a connecting section 1011 and a mounting section 1012 arranged sequentially along the axial direction. The radial dimension of the connecting section 1011 gradually decreases as it approaches the mounting section 1012. The maximum radial dimension of the mounting section 1012 is smaller than the minimum radial dimension of the connecting section 1011, so as to form a stepped surface 1013 between the connecting section 1011 and the mounting section 1012. The impeller sealing ring 200 is sleeved on the outer side of the mounting section 1012. The impeller sealing ring 200 and the mounting section 1012 are tightly fitted, and the impeller sealing ring 200 and the stepped surface 1013 abut against each other.

[0072] To facilitate the disassembly and assembly of the balancing correction component 400 on the device, and to ensure that the balancing correction component 400 can cooperate with the dynamic balancing correction unit 300 to stably connect the cover plate 101 and the impeller sealing ring 200.

[0073] Furthermore, such as Figure 3 As shown, the axial direction of the dynamic balancing correction unit 300 is parallel to the axial direction of the impeller sealing ring 200, so that the balancing correction component 400 on the device can be removed in the same direction.

[0074] Furthermore, such as Figure 3 As shown, the dimension of the dynamic balancing correction section 300 in the axial direction is not greater than the dimension of the impeller sealing ring 200 in the axial direction, and not less than half of the dimension of the impeller sealing ring 200 in the axial direction. By limiting the dimension of the dynamic balancing correction section 300, the balancing correction component 400 can enter a deeper position of the impeller sealing ring 200 through the dynamic balancing correction section 300, thereby ensuring a stable connection between the cover plate 101 and the impeller sealing ring 200.

[0075] During pump operation, there is an axial clearance, i.e. a leakage channel, between the impeller assembly 100 and the inner wall of the pump cavity. After the fluid is pressurized by the impeller assembly 100, there is a pressure difference between the front and rear end faces of the cover plate 101, forming an axial force source for the impeller assembly 100. The high-pressure fluid flows back from the radial outlet of the impeller assembly 100 to the axial inlet of the impeller assembly 100, causing pump volume loss. Therefore, the impeller sealing ring 200 is needed to reduce the leakage channel between the impeller assembly 100 and the inner wall of the cavity, thereby reducing the internal backflow of the pump, reducing the axial force of the impeller assembly 100, balancing the axial force, etc., to further increase the resistance in the leakage channel.

[0076] Furthermore, a labyrinth element 1100 is provided on the outer circular surface of the impeller sealing ring 200. The labyrinth element 1100 is a toothed or grooved labyrinth element.

[0077] By installing a labyrinth component inside the leakage channel, the labyrinth component increases fluid resistance as the fluid passes through it. When the pressure difference on both sides of the leakage channel disappears, a complete seal can be achieved.

[0078] In one embodiment of the present invention, see Figure 3 The maze component 1100 is a toothed maze component; specifically, the cross-sectional shape of the maze component 1100 is rectangular.

[0079] In one embodiment of the present invention, the labyrinth component 1100 is a groove-shaped labyrinth component, and the impeller sealing ring 200 extends toward the leakage channel to form an extension portion, on which the labyrinth component 1100 is formed.

[0080] As one of the preferred options, see [link / reference] Figure 5 and Figure 6The labyrinth component 1100 is a ring-shaped labyrinth component, arranged around the axis of the impeller sealing ring 200. Multiple labyrinth components 1100 are arranged sequentially at intervals along the axial direction of the impeller sealing ring 200. By defining the shape and arrangement of the labyrinth components 1100, the arrangement direction of the labyrinth components 1100 is the same as the flow direction of the fluid in the leakage channel, and each labyrinth component 1100 can increase the fluid resistance.

[0081] Second Embodiment

[0082] like Figure 1-2 As shown, a pump includes the impeller structure described above, and further includes:

[0083] Pump body 600 includes pump casing 603 that interlock to form cavity 602, impeller structure disposed inside cavity 602, wherein the axis of impeller structure coincides with the axis of cavity 602, and the outer circular surface of impeller sealing ring 200 and the inner wall of cavity 602 are arranged at intervals relative to each other in the radial direction of cavity 602.

[0084] The power unit 700 has a power mounting end face 601 on the outer side of the pump housing 603, and the power unit 700 is mounted on the power mounting end face 601.

[0085] The rotating shaft 800 is connected to the power unit 700 at one end and to the impeller assembly 100 at the other end.

[0086] Since the pump uses an impeller structure, the beneficial effects of the pump are as described in the impeller structure of the above embodiment.

[0087] It should be noted that, see Figure 1 A first impeller inlet 6021, connecting the inside and outside of the cavity 602, is provided on one side of the cavity 602 along the axial direction of the impeller assembly 100. A second impeller inlet 6022, connecting the inside and outside of the cavity 602, is provided on the other side of the cavity 602 along the axial direction of the impeller assembly 100. Fluid in the cavity 602 is drawn into the cavity through the first and second inlets, and enters the impeller assembly 100 through the first and second inlets on the axial direction of the impeller assembly 100, respectively. The impeller assembly 100 rotates under the action of the power 700 and the rotating shaft 800 to discharge the fluid from the outlet in the radial direction of the impeller assembly 100. An outlet connecting the inside and outside of the cavity 602 is provided. The outlet and outlet of the impeller assembly 100 are connected. The above describes the general flow direction of the fluid in the pump.

[0088] As one of the preferred options, the Power 700 is an axial magnetic field motor.

[0089] To further improve the sealing effect on leakage channels, the pump also includes:

[0090] Pump body sealing ring 900 is installed on the inner wall of cavity 602. Pump body sealing ring 900 includes a first ring portion 901 and a gap 1000 reserved in the radial direction of impeller sealing ring 200 in the first ring portion 901 and the impeller sealing ring 200.

[0091] By adding a pump body sealing ring 900, in which the first ring 901 and the impeller sealing ring 200 are arranged opposite to each other, the radial dimension of the leakage channel is reduced, thereby reducing the pressure difference on both sides of the leakage channel in the axial direction.

[0092] In one embodiment of the present invention, the pump is a centrifugal pump.

[0093] Furthermore, the pump body sealing ring 900 also includes:

[0094] The second ring portion 902, the first ring portion 901 and the second ring portion 902 are connected sequentially along the axial direction of the impeller 102. The second ring portion 902 extends toward the center of the cavity 602 so that the second ring portion 902 blocks the gap 1000 in the axial direction of the cavity 602.

[0095] By providing a second ring 902, the second ring 902 can further block the gap 1000, thereby increasing the resistance of the fluid in the axial direction of the leakage channel and reducing the pressure difference on both sides of the leakage channel in the axial direction.

[0096] Regarding the installation method of the pump body sealing ring 900, please refer to [link / reference]. Figure 2 Specifically, the second ring 902 is provided with a connecting rib 903 on the side opposite to the center of the cavity 602, and the inner wall of the cavity 602 is provided with a rib groove 904, and the connecting rib 903 is embedded in the rib groove 904.

[0097] To ensure that the connecting rib 903 and the rib groove 904 can fully position the relative position between the pump body sealing ring 900 and the cavity 602.

[0098] Furthermore, the connecting bar 903 is a ring-shaped connecting bar, and the bar groove 904 is a ring-shaped bar groove.

[0099] Furthermore, see Figure 2 A limiting groove is provided on one side of the second ring 902 facing the inner wall of the cavity 602. One end of the connecting rib 903 is embedded in and fixedly connected to the limiting groove, and the other end of the connecting rib 903 is embedded in the rib groove 904.

[0100] To enable the fluid inside the cavity 602 to be better introduced into the inlet in the axial direction of the impeller assembly 100.

[0101] Further, see Figure 2The size of the second ring 902 gradually increases as it approaches the impeller assembly 100. Specifically, the outer wall of the second ring 902 fits into the inner wall of the cavity 602, the inner wall of the second ring 902 is arc-shaped, and the inner wall of the second ring 902 near the end of the impeller assembly 100 falls into the water inlet of the impeller assembly 100 in the axial direction.

[0102] Traditional impeller sealing rings only use smooth gap sealing and are fixed with saddle screws. The dynamic balance correction surface is on the cover plates 101 on both sides of the double suction pump. However, the present invention adds a toothed or grooved labyrinth component 1100 on the basis of smooth sealing. By utilizing the characteristics of fluid dynamics, the labyrinth component 1100 increases the resistance during fluid flow, reduces the pressure difference on both sides of the leakage channel, and further reduces the axial force of the centrifugal pump impeller assembly 100.

[0103] When the impeller is dynamically balanced on the side of the cover plate 101, the hydraulic performance of the impeller will be damaged, and the thickness of the cover plate 101 may not meet the conditions for fine-tuning of dynamic balance. The present invention performs dynamic balancing on the impeller assembly 100 and the impeller sealing ring 200 as a whole. The cover plate 101 and the impeller sealing ring 200 are fitted with set screw holes on their sides. While ensuring a tight fit between the impeller assembly 100 and the impeller sealing ring 200, the imbalance of the impeller assembly 100 is further reduced, thus achieving the effect of fine-tuning.

[0104] In summary, the present invention has multiple toothed or grooved labyrinth components 1100 machined on the outer surface of the impeller sealing ring 200. When there is a pressure difference between the front and rear cover plates of the impeller assembly 100, the labyrinth seal increases the resistance during fluid flow, reduces the pressure difference on both sides of the leakage channel, and thus reduces the axial force of the impeller assembly 100 in the centrifugal pump. At the same time, the cover plate 101 and the impeller sealing ring 200 are fixed around the axis by the dynamic balancing correction component 400 to reduce the remaining imbalance.

[0105] The above embodiments are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A structure of an impeller, characterized by, The application relates to a centrifugal pump impeller assembly. The application comprises: a centrifugal pump impeller assembly (100) comprising a cover plate (101) and an impeller (102) arranged on the cover plate (101); a centrifugal pump impeller sealing ring (200) arranged on the outer side of the cover plate (101), a plurality of dynamic balance correction portions (300) being arranged between the cover plate (101) and the centrifugal pump impeller sealing ring (200) and spaced around the axis of the impeller (102); 2. A structure of an impeller according to claim 1, wherein a dynamic balance correction member (400) arranged corresponding to the dynamic balance correction portions (300), the cover plate (101) and the centrifugal pump impeller sealing ring (200) being detachably connected through the dynamic balance correction member (400), and the dynamic balance correction member (400) being arranged to adjust the balance of the centrifugal pump impeller assembly (100).

3. A blade wheel structure according to claim 2, wherein The dynamic balance correction portions (300) are groove-shaped dynamic balance correction portions, and the dynamic balance correction member (400) is screwed into the dynamic balance correction portions (300). A first mounting groove (301) is arranged on the inner circular surface of the centrifugal pump impeller sealing ring (200), and one end of the first mounting groove (301) is exposed on the outer end surface of the centrifugal pump impeller sealing ring (200); A second mounting groove (302) is arranged on the outer side of the cover plate (101), and one end of the second mounting groove (302) is exposed on the outer end surface of the cover plate (101); 4. A structure according to claim 3, wherein The first mounting groove (301) and the second mounting groove (302) enclose the dynamic balance correction portions (300).

5. A structure according to claim 1, wherein The axis direction of the dynamic balance correction portions (300) is parallel to the axis direction of the centrifugal pump impeller sealing ring (200), the size of the dynamic balance correction portions (300) in the axis direction is not greater than the size of the centrifugal pump impeller sealing ring (200) in the axis direction, and is not less than half of the size of the centrifugal pump impeller sealing ring (200) in the axis direction.

6. A structure according to claim 1, wherein The cover plate (101) comprises a connecting section (1011) and a mounting section (1012) arranged in sequence along the axis direction, the radial size of the connecting section (1011) gradually decreases in a manner close to the mounting section (1012), the maximum radial size of the mounting section (1012) is smaller than the minimum radial size of the connecting section (1011), so as to form a step surface (1013) between the connecting section (1011) and the mounting section (1012), the centrifugal pump impeller sealing ring (200) is arranged on the outer side of the mounting section (1012), the centrifugal pump impeller sealing ring (200) and the mounting section (1012) are tightly matched, and the centrifugal pump impeller sealing ring (200) and the step surface (1013) are in abutment. A labyrinth member (1100) is arranged on the outer circular surface of the centrifugal pump impeller sealing ring (200), and the labyrinth member (1100) is a tooth-shaped or groove-shaped labyrinth member.

7. A structure according to claim 6, wherein The labyrinth members (1100) are arranged around the axis of the impeller sealing ring (200), and the number of the labyrinth members (1100) is multiple, and the multiple labyrinth members (1100) are arranged in sequence and at intervals along the axial direction of the impeller sealing ring (200).

8. A structure according to claim 1 wherein, The impeller assembly (100) further comprises: A hub (103), the number of the cover plates (101) is two, which are a front cover plate (101a) and a rear cover plate (101b), the front cover plate (101a) and the rear cover plate (101b) are arranged in opposite intervals, the hub (103) is located between the front cover plate (101a) and the rear cover plate (101b), the impeller (102) is connected between the front cover plate (101a) and the hub (103), and between the rear cover plate (101b) and the hub (103); A flow guide plate (104), the flow guide plate (104) is connected between the outer periphery of the front cover plate (101a) and the outer periphery of the rear cover plate (101b), the number of the flow guide plate (104) is multiple, and adjacent flow guide plates (104) enclose a water outlet that communicates inside and outside the impeller assembly (100).

9. A structure according to claim 8, wherein The flow guide plate (104) comprises a front flow guide plate (1041) and a rear flow guide plate (1042), the front cover plate (101a), the front flow guide plate (1041), the rear flow guide plate (1042) and the rear cover plate (101b) are connected in sequence along the axial direction of the impeller (102), and the connection between the front flow guide plate (1041) and the rear flow guide plate (1042) is curved in a manner close to the impeller (102).

10. A pump characterized by The impeller structure as claimed in any one of claims 1 to 9, further comprising: A pump body (600), the pump body (600) comprises a pump shell (603) that is buckled to each other to form a cavity (602), and the impeller structure is arranged in the cavity (602), wherein the axis of the impeller structure and the axis of the cavity (602) coincide, and the outer circular surface of the impeller sealing ring (200) and the inner wall of the cavity (602) are arranged in opposite intervals in the radial direction of the cavity (602); A power (700), an outer side of the pump shell (603) is provided with a power mounting end face (601), and the power (700) is mounted on the power mounting end face (601); A rotating shaft (800), one end of the rotating shaft (800) is connected to the power (700), and the other end of the rotating shaft (800) is connected to the impeller assembly (100).

11. A pump according to claim 10, wherein Further comprising: A pump body sealing ring (900) is mounted on the inner wall of the cavity (602), and the pump body sealing ring (900) comprises a first ring part (901), and the first ring part (901) and the impeller sealing ring (200) are provided with a gap (1000) in the radial direction of the cavity (602).

12. A pump according to claim 11, wherein The pump body sealing ring (900) further comprises: A second ring part (902) is sequentially connected with the first ring part (901) and the second ring part (902) along the axial direction of the impeller (102), and the second ring part (902) is arranged in a manner extending towards the center of the cavity (602) so as to shield the gap (1000) in the axial direction of the cavity (602).

13. A pump according to claim 12, wherein The second ring part (902) is provided with a connecting rib (903) away from one side of the center of the cavity (602), and the inner wall of the cavity (602) is provided with a rib groove (904), and the connecting rib (903) is embedded in the rib groove (904).

14. The pump of claim 10, wherein The power (700) is an axial magnetic field motor.

Images