Balancing device of multistage pump rotor assembly

Abstract

The invention provides a balancing device of a multistage pump rotor assembly, which comprises a pump body and a pump shaft arranged on the pump body, the pump shaft is externally and fixedly connected with a balancing disc assembly, the pump body is fixedly provided with a balancing ring assembly, the balancing disc assembly is movably sleeved with the balancing ring assembly, and the balancing disc assembly is fixedly connected with the balancing ring assembly. A gap is formed between the balance ring assembly and the balance disc assembly in the axial direction of the pump shaft, the balance ring assembly comprises a first balance ring fixedly connected to the pump body and a second balance ring rotationally arranged relative to the first balance ring, and the second balance ring is arranged close to the balance disc assembly; the second balance ring can coaxially rotate with the balance disc assembly; the second balance ring and the balance disc can coaxially rotate, so that the situation that the existing balance ring and the balance disc are abraded when rotating relatively is avoided, and the situation that equipment cannot normally operate due to abrasion is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of multi-stage pumps, and in particular to a balancing device for a rotor assembly of a multi-stage pump. Background Art

[0002] The balancing device of the multistage pump rotor assembly mainly includes a balancing disc and a balancing ring. The following is its specific composition and working principle:Balancing disc: The balancing disc is installed on the pump shaft and rotates with the pump shaft. Its function is to automatically adjust the amount of liquid passing through by using the change of the axial clearance to balance the axial force. There are two gaps in the balancing disc device, one is the radial gap formed by the outer circle of the balancing sleeve and the shaft sleeve, and the other is the axial gap formed by the inner end face of the balancing disc. The balancing chamber behind the balancing disc is connected to the pump suction port, and the pressure difference between the two gaps generates a balancing force to balance the axial force acting on the rotor.Balancing ring: The balancing ring is fixed on the pump body, opposite to the balancing disc, and an axial clearance of 0.01 to 0.25 mm is retained between the two. The liquid pressure difference between the balancing ring and the balancing disc forms a balancing force, which is opposite to the axial force on the impeller and is used to balance the axial force on the impeller.

[0003] The structure of this multi-stage pump rotor assembly has certain defects: during the operation of the rotor components composed of the balancing disc, impeller, sleeve, shaft, etc., the balancing disc and the balancing ring are constantly rubbed due to changes in working conditions. After a period of use, the planes of the two will wear, and the impeller will move forward after the wear. When the wear reaches a certain degree, the impeller will rub against the middle section, which will cause the impeller to be damaged and the pump cannot operate normally. In order to solve the above problems, the present invention proposes a balancing device for a multi-stage pump rotor assembly. Summary of the invention

[0004] To achieve the above-mentioned objectives, the present invention provides a balancing device for a multi-stage pump rotor assembly, comprising a pump body and a pump shaft arranged on the pump body, wherein a balancing disk assembly is fixedly connected to the outside of the pump shaft, a balancing ring assembly is fixedly arranged on the pump body, the balancing ring assembly is movably sleeved outside the balancing disk assembly, and there is a gap between the balancing ring assembly and the balancing disk assembly in the axial direction of the pump shaft, wherein the balancing ring assembly comprises a first balancing ring fixedly connected to the pump body, and a second balancing ring arranged to rotate relative to the first balancing ring, the second balancing ring is arranged close to the balancing disk assembly, and the second balancing ring can rotate coaxially with the balancing disk assembly.

[0005] Optionally, the balance ring assembly also includes N first support rotating assemblies arranged between the first balance ring and the second balance ring and used to connect the first balance ring and the second balance ring, the N first support rotating assemblies are coaxially arranged, the first support rotating assembly includes a support ring fixedly connected to the side wall of the first balance ring, the interior of the support ring is provided with a cavity, the support ring is provided with a first annular opening connected to the cavity, a first support rod is movably arranged in the first annular opening, one end of the first support rod is fixedly connected to a first sliding ring, the first sliding ring is slidably arranged in the support ring, the other end of the first support rod is fixedly connected to the side wall of the second balance ring, the cross-sectional diameter of the first sliding ring is larger than the opening size of the first annular opening, and N is a positive integer greater than or equal to 2.

[0006] Optionally, the balancing disc assembly includes a first balancing disc fixedly mounted outside the pump shaft, and a second balancing disc arranged between the first balancing disc and the balancing ring assembly, and also includes M second supporting rotating assemblies arranged between the second balancing disc and the first balancing disc, the M second supporting rotating assemblies are coaxially arranged, the second supporting rotating assembly includes an annular supporting groove opened on the first balancing disc, a second annular opening connected to the annular supporting groove is opened on the first balancing disc, a second supporting rod is movably arranged in the second annular opening, one end of the second support rod is fixedly connected to a second sliding ring, the second sliding ring is movably arranged in the annular supporting groove, the cross-sectional diameter of the second sliding ring is larger than the opening size of the second annular opening, the other end of the second support rod is fixedly connected to the side wall of the second balancing disc, and M is a positive integer greater than or equal to 2.

[0007] Optionally, it also includes a plurality of integrated mechanisms arranged between the second balancing ring and the second balancing disk, and the plurality of integrated mechanisms are arranged in an equidistant ring shape with the axis of the pump shaft as the center. The integrated mechanism includes an integrated rod assembly fixedly arranged on the side wall of the second balancing disk, and an integrated groove provided on the second balancing ring. The integrated rod assembly is movably inserted in the integrated groove, and a first anti-stuck groove with a trumpet-shaped groove cavity is provided at the notch of the integrated groove, and a second anti-stuck groove with a trumpet-shaped groove cavity is provided at one end of the integrated rod assembly located in the integrated groove.

[0008] Optionally, the integrated rod assembly includes a first rod and a second rod that can move relatively along the axis of the pump shaft, the first rod is arranged in the integrated groove, the second rod is fixedly arranged on the second balancing plate, a cavity is opened inside the second rod, one end of the guide limit assembly is fixedly connected to the side wall of the cavity, the other end of the guide limit assembly is fixedly connected to a third rod, the free end of the third rod is fixedly connected to an arc segment, and the free end of the arc segment is fixedly connected to the first rod.

[0009] Optionally, the guide limit assembly includes a guide limit rod, a guide limit cylinder and a guide limit spring, the guide limit rod is movably inserted in the guide limit cylinder, the guide limit spring is wound and arranged outside the guide limit rod, and the two ends of the guide limit spring are respectively fixedly connected to the side wall of the guide limit rod and the outer side wall of the guide limit cylinder.

[0010] Optionally, it also includes a first fastening balancing mechanism, which includes a first fastening ring sleeved on the outside of the third rod, and a plurality of second fastening rings fixedly arranged on the side wall of the cavity, and a first fastening groove is formed between two adjacent second fastening rings, and the first fastening groove is matched with the first fastening ring, wherein the outer ring wall of the first fastening ring and the inner ring wall of the second fastening ring are staggered, and a plurality of second fastening rings are equidistantly arranged along the axis of the pump shaft, and the second fastening rings are made of elastic material.

[0011] Optionally, it also includes a second fastening balancing mechanism, which includes a third anti-stuck groove which is opened on the third rod and has a trumpet-shaped structure, and a plurality of fastening rods movably plugged into the second rod, the plurality of fastening rods are arranged in an equidistant ring shape, a fastening spring is wound around the outside of the fastening rod, the two ends of the fastening spring are respectively fixedly connected to the side wall of the fastening rod and the side wall of the cavity, the fastening rod extends into the first movable groove, the first movable groove is opened on the second rod, one end of the fastening rod located in the first movable groove is fixedly connected to an elastic plate, the elastic plate is fixedly arranged in the first movable groove, and a second fastening groove matching the fastening rod is opened on the third rod.

[0012] Optionally, it also includes a first balancing positioning mechanism, which includes a moving cavity opened in the second rod and the third rod, and a moving plate movably arranged in the moving cavity, one end of the moving plate is fixedly connected to the guide limit assembly, the guide limit assembly is movably inserted on the third rod, the other end of the moving plate is hinged to one end of a plurality of first push-pull rods, the other end of the first push-pull rod is hinged to the resistance rod, the resistance rod is movably inserted on the second rod, a push-pull spring is wound around the outside of the resistance rod, the two ends of the push-pull spring are respectively fixedly connected to the side walls of the resistance rod and the side walls of the moving cavity, one end of the resistance rod located outside the moving cavity extends into the second moving groove, the second moving groove is opened on the second rod, a fastening plate is movably arranged in the second moving groove, and the fastening plate is fixedly connected to the resistance rod.

[0013] Optionally, it also includes a second balancing positioning mechanism, which includes a fastening ball that fits the arc segment, the side wall of the fastening ball is fixedly connected to a second push-pull rod, the free end of the second push-pull rod is hinged on the fixed seat, the fixed seat is fixedly set on the guide limit assembly, the side wall of the guide limit assembly is fixedly connected to one end of a connecting spring, and the other end of the connecting spring is fixedly connected to the side wall of the second push-pull rod.

[0014] The beneficial effects of the present invention are as follows:

[0015] The present invention improves the structure of the existing balance ring. The improved balance ring includes a first balance ring and a second balance ring which can perform relative rotational motion, and the first balance ring is fixed on a pump body, and the second balance ring can rotate coaxially with a balance disk. During operation, the liquid in the gap between the balance ring and the balance disk is used to exert pressure on the second balance ring and the balance disk, and the liquid can be used as a connecting piece to connect the second balance ring and the balance disk together. In this way, the second balance ring can rotate synchronously with the balance disk, thereby avoiding the occurrence of wear when the existing balance ring and the balance disk rotate relative to each other, and further avoiding the occurrence of equipment failure due to wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of an embodiment of a balancing device of a multi-stage pump rotor assembly of the present invention;

[0017] Figure 2 It is a structural schematic diagram of a balancing ring assembly in a balancing device of a multi-stage pump rotor assembly of the present invention;

[0018] Figure 3 The balancing device of the multi-stage pump rotor assembly of the present invention Figure 2 A schematic diagram of the enlarged structure in the middle;

[0019] Figure 4It is a structural schematic diagram of a balancing disc assembly in a balancing device of a multi-stage pump rotor assembly of the present invention;

[0020] Figure 5 The balancing device of the multi-stage pump rotor assembly of the present invention Figure 4 A magnified schematic diagram of the structure B in the middle;

[0021] Figure 6 It is a structural schematic diagram of an integrated mechanism in a balancing device of a multi-stage pump rotor assembly of the present invention;

[0022] Figure 7 It is a structural schematic diagram of an integrated rod assembly in a balancing device of a multi-stage pump rotor assembly of the present invention;

[0023] Figure 8 It is a structural schematic diagram of a first fastening balancing mechanism in a balancing device of a multi-stage pump rotor assembly of the present invention;

[0024] Fig. 9 It is a structural schematic diagram of a second fastening balancing mechanism in a balancing device of a multi-stage pump rotor assembly of the present invention;

[0025] Fig.10 It is a structural schematic diagram of a first balancing positioning mechanism in a balancing device of a multi-stage pump rotor assembly of the present invention;

[0026] Fig.11 It is a schematic structural diagram of the second balancing positioning mechanism in the balancing device of the multi-stage pump rotor assembly of the present invention.

[0027] Reference numerals

[0028] Pump body 1, pump shaft 2, impeller 3,

[0029] Balance ring assembly 4, first balance ring 41, second balance ring 42, first support rotating assembly 43, support ring 431, first annular opening 432, first sliding ring 433, first support rod 434, balance disk assembly 5, first balance disk 51, second balance disk 52, second support rotating assembly 53, annular support groove 531, second annular opening 532, second sliding ring 533, second support rod 534, integrated mechanism 6, integrated rod assembly 61, first rod 611, second rod 612, arc segment 613, third rod 614, guide limiting assembly 615, guide limiting rod 6151, guide limiting cylinder 6152, guide limiting spring 6153, integrated groove 62, first anti-stuck groove 63, second anti-stuck groove 64,

[0030] The first fastening balance mechanism 7, the first fastening ring 71, the second fastening ring 72, the first fastening groove 73,

[0031] The second fastening balance mechanism 8, the third anti-stuck groove 81, the fastening rod 82, the fastening spring 83, the elastic plate 84, the first moving groove 85, the second fastening groove 86,

[0032] The first balancing and positioning mechanism 9, the moving cavity 91, the moving plate 92, the first push-pull rod 93, the resisting rod 94, the push-pull spring 95, the fastening plate 96, the second moving groove 97,

[0033] The second balancing and positioning mechanism 10 , the fastening ball 101 , the second push-pull rod 102 , the fixing seat 103 , and the connecting spring 104 . DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with general skills in the field to which the present invention belongs. "Including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0035] In view of the problems existing in the prior art, an embodiment of the present invention provides a balancing device for a multi-stage pump rotor assembly, such as Figure 1 and Figure 2 As shown, the balancing device of the multi-stage pump rotor assembly includes a pump body 1, and a pump shaft 2 arranged on the pump body 1, a balancing disk assembly 5 is fixedly connected to the outside of the pump shaft 2, a balancing ring assembly 4 is fixedly arranged on the pump body 1, the balancing ring assembly 4 is movably sleeved outside the balancing disk assembly 5, and there is a gap between the balancing ring assembly 4 and the balancing disk assembly 5 in the axial direction of the pump shaft 2, and the existence of the gap serves as a channel for conveying liquid; wherein, the balancing ring assembly 4 includes a first balancing ring 41 fixedly connected to the pump body 1, and a second balancing ring 42 arranged to rotate relative to the first balancing ring 41 (the first balancing ring 41 is arranged on the left side of the second balancing ring 42), the second balancing ring 42 is arranged close to the balancing disk assembly 5, and the second balancing ring 42 can rotate coaxially with the balancing disk assembly 5 (rotate around the horizontal center axis of the pump shaft 2).

[0036] The arrangement of this embodiment is achieved by improving the structure of the existing balance ring. The improved balance ring includes a first balance ring 41 and a second balance ring 42, wherein the first balance ring 41 is connected to the pump body 1, and the second balance ring 42 and the first balance ring 41 are arranged to rotate with each other. The second balance ring 42 and the balance disk can also be arranged to rotate with each other. However, in this embodiment, the liquid in the gap has a large pressure, which will have a resistance effect on the balance disk and the second balance ring 42. In this way, the liquid can be used as a connecting piece to fix the balance disk and the second balance ring 42 together, so that when the balance disk rotates, it can rotate with the second balance ring 42, thereby avoiding the occurrence of wear when the two rotate relative to each other.

[0037] In order to keep the first balance ring 41 and the second balance ring 42 in a sealed state, and to ensure that the first balance ring 41 and the second balance ring 42 are always on a vertical parallel plane, in one embodiment, Figure 5 As shown, the balance ring assembly 4 also includes N first support rotating assemblies 43 which are arranged between the first balance ring 41 and the second balance ring 42 and are used to connect the first balance ring 41 and the second balance ring 42. The arrangement of the first support rotating assembly 43 can play a supporting role. Through the arrangement of the first support rotating assembly 43, the second balance ring 42 can rotate relative to the first balance ring 41; the N first support rotating assemblies 43 are coaxially arranged. Specifically, with the horizontal axis center line of the pump shaft 2 as the center, the N first support rotating assemblies 43 are arranged from the inside to the outside in sequence. Figure 3 From the left view of the example, it can be seen that N first supporting rotating components 43 form N concentric circles; the first supporting rotating component 43 includes a supporting ring 431 fixedly connected to the side wall of the first balancing ring 41, the interior of the supporting ring 431 is provided with a cavity, the supporting ring 431 is provided with a first annular opening 432 connected to the cavity, a first supporting rod 434 is movably arranged in the first annular opening 432, one end of the first supporting rod 434 is fixedly connected to a first sliding ring 433, the first sliding ring 433 is slidably arranged in the supporting ring 431, the other end of the first supporting rod 434 is fixedly connected to the side wall of the second balancing ring 42, the cross-sectional diameter of the first sliding ring 433 is larger than the opening size of the first annular opening 432, such a setting can prevent the first sliding ring 433 from falling out of the first annular opening 432; N is a positive integer greater than or equal to 2.

[0038] The first supporting rotating assembly 43 in this embodiment can be used to support the first balancing ring 41 and the second balancing ring 42; and can also enable the first balancing ring 41 and the second balancing ring 42 to rotate relative to each other, that is, when the second balancing ring 42 makes a selective movement relative to the first balancing ring 41, the first supporting rod 434 slides with the first sliding ring 433 in the supporting ring 431. Preferably, the number of the first supporting rotating assembly 43 can be set to 2, 3 or more.

[0039] In one embodiment, if Figure 4 As shown, the balancing disc assembly 5 includes a first balancing disc 51 fixedly sleeved outside the pump shaft 2, and a second balancing disc 52 arranged between the first balancing disc 51 and the balancing ring assembly 4, which can be understood as the second balancing disc 52 being arranged in the gap; it also includes M second supporting rotating assemblies 53 arranged between the second balancing disc 52 and the first balancing disc 51, and the arrangement of the M second supporting rotating assemblies 53 can not only support the first balancing disc 51 and the second balancing disc 52, but also ensure that the second balancing disc 52 can rotate relative to the first balancing disc 51, and at the same time, the M second supporting rotating assemblies 53 can also ensure the sealing between the first balancing disc 51 and the second balancing disc 52; the M second supporting rotating assemblies 53 are coaxially arranged, and the The second supporting rotating assembly 53 includes an annular supporting groove 531 provided on the first balancing disk 51, a second annular opening 532 communicating with the annular supporting groove 531 is provided on the first balancing disk 51, a second supporting rod 534 is movably provided in the second annular opening 532, one end of the second supporting rod 534 is fixedly connected to a second sliding ring 533, the second sliding ring 533 is movably provided in the annular supporting groove 531, the cross-sectional diameter of the second sliding ring 533 is larger than the opening size of the second annular opening 532, such a configuration can prevent the second sliding ring 533 from escaping from the second annular opening 532; the other end of the second supporting rod 534 is fixedly connected to the side wall of the second balancing disk 52, and M is a positive integer greater than or equal to 2.

[0040] The arrangement of the balancing disc assembly 5 in this embodiment improves the existing balancing disc structure. The improved balancing disc includes a first balancing disc 51 and a second balancing disc 52 that can rotate relative to each other. In this way, the second balancing disc 52 can be connected to the balancing ring through the resistance force of the liquid, so that when the balancing disc assembly 5 rotates, damage to the balancing disc assembly 5 and the balancing ring assembly 4 can be avoided.

[0041] In the actual installation and use process, the following examples of settings can all avoid wear and tear on the balancing disk and the balancing ring: in the first example, the balancing ring adopts the improved balancing ring assembly 4 in the present invention, and the balancing disk still adopts the balancing disk in the prior art. In this example, the second balancing ring 42 and the balancing disk are combined into one by the resistance force of the liquid, so that when working, the balancing disk and the second balancing ring 42 will rotate relative to the first balancing ring 41; in the second example, the balancing ring adopts the balancing ring in the prior art, and the balancing disk adopts the balancing disk assembly 5 in the present invention. In this example, the balancing ring and the second balancing disk 52 are combined into one by the resistance force of the liquid, so that when working, the balancing ring and the second balancing disk 52 will rotate relative to the first balancing disk 51; in the third example, the balancing ring adopts the balancing ring assembly 4 of the present invention, and the balancing disk adopts the balancing disk assembly 5 of the present invention. In this example, the second balancing ring 42 and the second balancing disk 52 are combined into one by the resistance force of the liquid. When the first balancing disk 51 rotates, the first balancing disk 51 rotates relative to the combination of the second balancing ring 42 and the second balancing disk 52, and the combination of the second balancing ring 42 and the second balancing disk 52 can also rotate relative to the first balancing ring 41 when it is stationary.

[0042] In the third example, in addition to the liquid connecting the second balancing ring 42 and the second balancing disk 52 by abutment, in order to make the second balancing ring 42 and the second balancing disk 52 fixed more firmly, in one embodiment, as Figure 6As shown, the balancing device of the multi-stage pump rotor assembly also includes a plurality of integrated mechanisms 6 arranged between the second balancing ring 42 and the second balancing disk 52, and the plurality of integrated mechanisms 6 are arranged in an equidistant ring shape with the axis of the pump shaft 2 as the center. From the left view of Figure 6, we can see that the plurality of integrated mechanisms 6 can form a circular structure. Preferably, the number of integrated mechanisms 6 is 3, but it is not limited to being set to 3; the integrated mechanism 6 includes an integrated rod assembly 61 fixedly arranged on the side wall of the second balancing disk 52, and an integrated groove 62 provided on the second balancing ring 42, the integrated rod assembly 61 is movably inserted into the integrated groove 62, and after the integrated rod assembly 61 is inserted into the integrated groove 62, it can lock the second balancing ring 42 and the second balancing disk 52 to avoid The second balance ring 42 and the second balance disk 52 rotate coaxially with each other; a first anti-stuck groove 63 with a trumpet-shaped groove cavity is provided at the notch of the integrated groove 62, and a second anti-stuck groove 64 with a trumpet-shaped groove cavity is provided at one end of the integrated rod assembly 61 located in the integrated groove 62; during the installation process, in order to enable the integrated rod assembly 61 to quickly and accurately enter the integrated groove 62, a combination structure of the first anti-stuck groove 63 and the second anti-stuck groove 64 is provided in this example, and the setting of the combination structure can enable the integrated rod assembly 61 to accurately enter the integrated groove 62 through a guiding effect. At the same time, the combination structure of the first anti-stuck groove 63 and the second anti-stuck groove 64 does not need to be so accurately aligned with the positions of the integrated groove 62 and the integrated rod assembly 61 when the equipment is assembled, thereby reducing the difficulty of installation.

[0043] In one embodiment, if Figure 7 As shown, the integrated rod assembly 61 includes a first rod 611 and a second rod 612 which can move relatively along the axis of the pump shaft 2, the first rod 611 is arranged in the integrated groove 62, the second rod 612 is fixedly arranged on the second balancing plate 52, and a cavity is opened inside the second rod 612, and one end of the guide limit assembly 615 is fixedly connected to the side wall of the cavity, and the other end of the guide limit assembly 615 is fixedly connected to the third rod 614, the free end of the third rod 614 is fixedly connected to the arc segment 613, and the free end of the arc segment 613 is fixedly connected to the first rod 611.

[0044] In this embodiment, the first rod 611, the arc segment 613 and the third rod 614 form a lollipop-shaped structure; the arrangement of this embodiment can change the length of the integrated mechanism 6, that is, change the size of the gap between the second balance ring 42 and the second balance disk 52, so that the device is suitable for different liquids and can also be used for different flow rates of the same liquid, thereby making the device more widely applicable.

[0045] In one embodiment, if Figure 7 As shown, the guide limit assembly 615 includes a guide limit rod 6151, a guide limit cylinder 6152 and a guide limit spring 6153. The guide limit rod 6151 is movably inserted in the guide limit cylinder 6152, and the guide limit spring 6153 is wound and arranged outside the guide limit rod 6151, and the two ends of the guide limit spring 6153 are respectively fixedly connected to the side wall of the guide limit rod 6151 and the outer side wall of the guide limit cylinder 6152. In this embodiment, the setting of the guide limit assembly 615 can not only play the role of guiding support for the movement of the first rod 611, but also provide a reset force for the reset movement of the first rod 611. Of course, in other embodiments, the structure of the guide limit assembly 615 is not limited to the combined structure of the guide limit rod 6151, the guide limit cylinder 6152 and the guide limit spring 6153.

[0046] In one embodiment, if Figure 8 As shown, the balancing device of the multi-stage pump rotor assembly also includes a first fastening balancing mechanism 7, which includes a first fastening ring 71 sleeved outside the third rod 614, and the first fastening ring 71 is covered outside the right end of the third rod 614; and a plurality of second fastening rings 72 fixedly arranged on the side wall of the cavity, the number of the second fastening rings 72 is set to at least 2, and can also be set to 3, or more; a first fastening groove 73 is formed between two adjacent second fastening rings 72, and the first fastening groove 73 is matched with the first fastening ring 71. Among them, the outer ring wall of the first fastening ring 71 and the inner ring wall of the second fastening ring 72 are staggered, which can be understood as that the first fastening ring 71 and the second fastening ring 72 are coaxially arranged, and the diameter of the inner ring of the second fastening ring 72 is smaller than the outer ring diameter of the first fastening ring 71; a plurality of second fastening rings 72 are equidistantly arranged along the axis of the pump shaft 2, which can be understood as that a plurality of second fastening rings 72 are arranged on the same horizontal center line, preferably, the horizontal center axes of the first fastening ring 71, the second fastening ring 72 and the cavity coincide; the second fastening ring 72 is made of elastic material. The same material as the sealing ring can be used. This arrangement enables the first fastening ring 71 to cause the second fastening ring 72 to deform and enter the first fastening groove 73 through the resistance effect. After the first fastening ring 71 passes over the second fastening ring 72, the second fastening ring 72 returns to its initial position, which can block the first fastening ring 71. In this way, the first fastening ring 71 is locked in the first fastening groove 73 through the two second fastening rings 72 on the left and right sides of the first fastening groove 73. It should be understood that when the gaps are different, the first fastening ring 71 can be located in different first fastening grooves 73.

[0047] The first fastening balancing mechanism 7 is a first embodiment for locking the first rod 611 and the second rod 612, that is, a first embodiment for locking the gap size between the second balancing ring 42 and the second balancing disk 52. Of course, in other embodiments, it is not limited to the first fastening balancing mechanism 7. For example, Fig. 9 As shown, the balancing device of the multi-stage pump rotor assembly also includes a second fastening balancing mechanism 8, which includes a third anti-stuck groove 81 that is opened on the third rod 614 and has a trumpet-shaped structure, and the third anti-stuck groove 81 is set on the right end of the third rod 614; and a plurality of fastening rods 82 that are movably plugged into the second rod 612, and the plurality of fastening rods 82 are arranged in an equidistant ring shape. The number of fastening rods 82 can be set to 3, 4 or more, which will not be repeated here; a fastening spring 83 is wound around the outside of the fastening rod 82, and the two ends of the fastening spring 83 are respectively fixedly connected to the side wall of the fastening rod 82 and the On the side wall of the cavity, a fastening spring 83 is provided to provide a reset force, that is, as the third rod 614 moves to the right, when the second fastening groove 86 is aligned with the fastening rod 82, the fastening rod 82 is pushed by the fastening spring 83 to enter the second fastening groove 86, thereby performing a locking process; the fastening rod 82 extends into the first movable groove 85, and the first movable groove 85 is provided on the second rod 612, and one end of the fastening rod 82 located in the first movable groove 85 is fixedly connected to an elastic plate 84, and the elastic plate 84 is fixedly arranged in the first movable groove 85, and a second fastening groove 86 matching the fastening rod 82 is provided on the third rod 614.

[0048] The second fastening balancing mechanism 8 in this embodiment can also replace the first fastening balancing mechanism 7, and is used to lock the gap size between the second balancing ring 42 and the second balancing disk 52. This embodiment is different from the first embodiment in that, when unlocking, the first unlocking method uses a horizontal pulling force to the left or right to complete the unlocking process, while in this embodiment, it is necessary to add a magnet to the first movable groove 85, and the magnet will attract the fastening rod 82 to move radially. When the fastening rod 82 is separated from the second fastening groove 86, the unlocking process is completed.

[0049] In order to adjust the positions of the balancing ring assembly 4 and the balancing disc assembly 5 so that the relative surfaces of the balancing ring assembly 4 and the balancing disc assembly 5 are always in a vertical state after adjustment, in one embodiment, Fig.10As shown, the balancing device of the multi-stage pump rotor assembly also includes a first balancing positioning mechanism 9, which includes a moving cavity 91 opened in the second rod 612 and the third rod 614, and the moving cavity 91 includes a horizontal section and a circular section. The diameter of the circular section is greater than the vertical height of the horizontal section; and a moving plate 92 movably arranged in the moving cavity 91, and the moving plate 92 is specifically slidably arranged in the horizontal section. Through the limitation of the horizontal section, it is ensured that the moving plate 92 can only move in the horizontal direction; one end (right end) of the moving plate 92 is fixedly connected to the guide limiting assembly 615, and the guide limiting assembly 615 is movably plugged into the third rod 614, and the left end of the guide limiting assembly 615 is inserted into the moving cavity 91; The other end (left end) of the movable plate 92 is hinged to one end of several first push-pull rods 93, and the number of the first push-pull rods 93 can be set to 2, 3 or more; the other end of the first push-pull rod 93 is hinged to the contact rod 94, and the contact rod 94 is movably inserted into the second rod 612, and a push-pull spring 95 is wound around the outside of the contact rod 94, and the two ends of the push-pull spring 95 are respectively fixedly connected to the side walls of the contact rod 94 and the side walls of the movable cavity 91, and the end of the contact rod 94 located outside the movable cavity 91 extends into the second movable groove 97, and the second movable groove 97 is opened on the second rod 612, and a fastening plate 96 is movably arranged in the second movable groove 97, and the fastening plate 96 is fixedly connected to the contact rod 94.

[0050] The setting of the first balancing positioning mechanism 9 in this embodiment can not only adjust the positions of the balancing ring assembly 4 and the balancing disk assembly 5, so that the relative surfaces of the adjusted balancing ring assembly 4 and the balancing disk assembly 5 are always in a vertical state, but also the structural design of the first balancing positioning mechanism 9 is reasonable, and the adjustment of the balancing ring assembly 4 and the balancing disk assembly 5 can be automatically realized, thereby greatly reducing the operating difficulty of the equipment and improving the installation efficiency. At the same time, it can also play a tightening role, so that the first rod 611 is fastened to the integrated groove 62, thereby firmly locking the second balancing ring 42 and the second balancing disk 52 together. During operation, when the third rod 614 moves into the hole cavity, it will resist the movable plate 92 to move leftward relative to the third rod 614 through the guide limit assembly 615. The movement of the movable plate 92 will push the resistance rod 94 upward or downward through the first push-pull rod 93, so that the fastening plate 96 moves to the outside of the second movable groove 97 and resists the wall of the integral groove 62. Since the movement trends of several fastening plates 96 are consistent, when the relative surfaces of the balance ring assembly 4 and the balance disk assembly 5 are not in a vertical state, due to the resistance adjustment of several fastening plates 96, the balance ring assembly 4 and the balance disk assembly 5 will be adjusted to a vertical state.

[0051] Of course, in other embodiments, the adjustment of the positions of the balancing ring assembly 4 and the balancing disc assembly 5 is not limited to using only the first balancing positioning mechanism 9. For example, Fig.11 As shown, the balancing device of the multi-stage pump rotor assembly also includes a second balancing positioning mechanism 10, and the second balancing positioning mechanism 10 includes a fastening ball 101 that fits the arc segment 613. The side wall of the fastening ball 101 is fixedly connected to a second push-pull rod 102. It should be noted that the number of fastening balls 101 is at least 2. When there are 2, the 2 fastening balls 101 are symmetrically arranged about the horizontal midline of the first rod 611. It can also be 3 or more. When there are 3 or more, several fastening balls 101 are evenly spaced. The distance is arranged in a ring shape; the free end of the second push-pull rod 102 is hinged on the fixed seat 103, and the fixed seat 103 is fixedly set on the guide limit assembly 615. The fixed seat 103 can be a ring-shaped structure or a block-shaped structure. When it is a block-shaped structure, the number of fixed seats 103 is consistent with the number of second push-pull rods 102; the side wall of the guide limit assembly 615 is fixedly connected to one end of the connecting spring 104, and the other end of the connecting spring 104 is fixedly connected to the side wall of the second push-pull rod 102.

[0052] The second balancing and positioning mechanism 10 in this embodiment can adjust the balancing ring assembly 4 and the balancing disk assembly 5. When working, when the first rod 611, the arc segment 613 and the third rod 614 move to the right relative to the second rod 612, the fastening balls 101 will spread to four directions and contact the side wall of the integral groove 62 under the interference of the arc segment 613 and the lollipop-shaped structure of the first rod 611, and the movement of several fastening balls 101 is consistent, so that the balancing ring assembly 4 and the balancing disk assembly 5 can be adjusted by several fastening balls 101, and at the same time, the above-mentioned fastening and locking function can be achieved through the interference, which will not be repeated here.

[0053] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. A balancing device for a multistage pump rotor assembly, characterized in that: The invention comprises a pump body (1), and a pump shaft (2) arranged on the pump body (1), wherein a balancing disc assembly (5) is fixedly connected to the outside of the pump shaft (2), and a balancing ring assembly (4) is fixedly arranged on the pump body (1), wherein the balancing ring assembly (4) is movably sleeved outside the balancing disc assembly (5), and a gap exists between the balancing ring assembly (4) and the balancing disc assembly (5) in the axial direction of the pump shaft (2), wherein the balancing ring assembly (4) comprises a first balancing ring (41) fixedly connected to the pump body (1), and a second balancing ring (42) arranged to rotate relative to the first balancing ring (41), wherein the second balancing ring (42) is arranged close to the balancing disc assembly (5), and the second balancing ring (42) can rotate coaxially with the balancing disc assembly (5).

2. The balancing device for a multi-stage pump rotor assembly according to claim 1, characterized in that: The balance ring assembly (4) further comprises N first support rotation assemblies (43) which are arranged between the first balance ring (41) and the second balance ring (42) and are used to connect the first balance ring (41) and the second balance ring (42), the N first support rotation assemblies (43) being coaxially arranged, the first support rotation assembly (43) comprising a support ring (431) fixedly connected to the side wall of the first balance ring (41), a cavity being arranged inside the support ring (431), and a first support opening communicating with the cavity being provided on the support ring (431). An annular opening (432), a first support rod (434) is movably arranged in the first annular opening (432), one end of the first support rod (434) is fixedly connected to a first sliding ring (433), the first sliding ring (433) is slidably arranged in the support ring (431), the other end of the first support rod (434) is fixedly connected to the side wall of the second balance ring (42), the cross-sectional diameter of the first sliding ring (433) is larger than the opening size of the first annular opening (432), and N is a positive integer greater than or equal to (2).

3. The balancing device of the multi-stage pump rotor assembly according to claim 1, characterized in that: The balancing disc assembly (5) comprises a first balancing disc (51) fixedly sleeved outside the pump shaft (2), and a second balancing disc (52) arranged between the first balancing disc (51) and the balancing ring assembly (4), and further comprises M second supporting rotating assemblies (53) arranged between the second balancing disc (52) and the first balancing disc (51), the M second supporting rotating assemblies (53) being coaxially arranged, the second supporting rotating assemblies (53) comprising an annular supporting groove (531) provided on the first balancing disc (51), and a groove (531) provided on the first balancing disc (51) and coaxially arranged with the annular supporting groove (531) The support groove (531) is connected to a second annular opening (532), a second support rod (534) is movably arranged in the second annular opening (532), one end of the second support rod (534) is fixedly connected to a second sliding ring (533), the second sliding ring (533) is movably arranged in the annular support groove (531), the cross-sectional diameter of the second sliding ring (533) is larger than the opening size of the second annular opening (532), the other end of the second support rod (534) is fixedly connected to the side wall of the second balancing disk (52), and M is a positive integer greater than or equal to 2.

4. The balancing device for a multi-stage pump rotor assembly according to claim 3, characterized in that: The invention also comprises a plurality of integrated mechanisms (6) arranged between the second balancing ring (42) and the second balancing disk (52), wherein the plurality of integrated mechanisms (6) are arranged in an equidistant ring shape with the axis of the pump shaft (2) as the center, and the integrated mechanism (6) comprises an integrated rod assembly (61) fixedly arranged on the side wall of the second balancing disk (52), and an integrated groove (62) provided on the second balancing ring (42), wherein the integrated rod assembly (61) is movably inserted into the integrated groove (62), and a first anti-stuck groove (63) having a horn-shaped groove cavity is arranged at the groove opening of the integrated groove (62), and a second anti-stuck groove (64) having a horn-shaped groove cavity is arranged at one end of the integrated rod assembly (61) located in the integrated groove (62).

5. The balancing device for a multi-stage pump rotor assembly according to claim 4, characterized in that: The integrated rod assembly (61) comprises a first rod (611) and a second rod (612) which are relatively movable along the axis of the pump shaft (2); the first rod (611) is arranged in the integrated groove (62); the second rod (612) is fixedly arranged on the second balancing plate (52); a cavity is provided inside the second rod (612); one end of a guide and limit assembly (615) is fixedly connected to a side wall of the cavity; the other end of the guide and limit assembly (615) is fixedly connected to a third rod (614); the free end of the third rod (614) is fixedly connected to an arc segment (613); the free end of the arc segment (613) is fixedly connected to the first rod (611).

6. The balancing device for a multi-stage pump rotor assembly according to claim 5, characterized in that: The guide limit assembly (615) comprises a guide limit rod (6151), a guide limit cylinder (6152) and a guide limit spring (6153); the guide limit rod (6151) is movably inserted into the guide limit cylinder (6152); the guide limit spring (6153) is wound around the outside of the guide limit rod (6151); and the two ends of the guide limit spring (6153) are respectively fixedly connected to the side wall of the guide limit rod (6151) and the outer side wall of the guide limit cylinder (6152).

7. The balancing device for a multi-stage pump rotor assembly according to claim 5, characterized in that: It also includes a first fastening balancing mechanism (7), which includes a first fastening ring (71) sleeved outside the third rod (614), and a plurality of second fastening rings (72) fixedly arranged on the side wall of the cavity, a first fastening groove (73) is formed between two adjacent second fastening rings (72), and the first fastening groove (73) is matched with the first fastening ring (71), wherein the outer ring wall of the first fastening ring (71) and the inner ring wall of the second fastening ring (72) are staggered, and a plurality of second fastening rings (72) are equidistantly arranged along the axis of the pump shaft (2), and the second fastening rings (72) are made of elastic material.

8. The balancing device for a multi-stage pump rotor assembly according to claim 5, characterized in that: The invention also comprises a second fastening balancing mechanism (8), wherein the second fastening balancing mechanism (8) comprises a third anti-stuck groove (81) which is provided on the third rod (614) and has a trumpet-shaped structure, and a plurality of fastening rods (82) which are movably plugged into the second rod (612), wherein the plurality of fastening rods (82) are arranged in an equidistant ring shape, and a fastening spring (83) is wound around the outside of the fastening rod (82), and the two ends of the fastening spring (83) are respectively fixedly connected to the fastening rod ( 82) and the side wall of the cavity, the fastening rod (82) extends into the first movable groove (85), the first movable groove (85) is opened on the second rod (612), one end of the fastening rod (82) located in the first movable groove (85) is fixedly connected with an elastic plate (84), the elastic plate (84) is fixedly arranged in the first movable groove (85), and the third rod (614) is provided with a second fastening groove (86) matching the fastening rod (82).

9. The balancing device of a multi-stage pump rotor assembly according to claim 7 or 8, characterized in that: The invention also includes a first balancing and positioning mechanism (9), wherein the first balancing and positioning mechanism (9) includes a movable cavity (91) provided in the second rod (612) and the third rod (614), and a movable plate (92) movably arranged in the movable cavity (91), one end of the movable plate (92) is fixedly connected to a guide limit assembly (615), the guide limit assembly (615) is movably plugged into the third rod (614), the other end of the movable plate (92) is hinged to one end of a plurality of first push-pull rods (93), and the other end of the first push-pull rods (93) is hinged to the abutment rod (94). The resistance rod (94) is movably inserted into the second rod (612), and a push-pull spring (95) is wound around the outside of the resistance rod (94). The two ends of the push-pull spring (95) are respectively fixedly connected to the side wall of the resistance rod (94) and the side wall of the movable cavity (91). One end of the resistance rod (94) located outside the movable cavity (91) extends into the second movable groove (97). The second movable groove (97) is opened on the second rod (612). A fastening plate (96) is movably arranged in the second movable groove (97), and the fastening plate (96) is fixedly connected to the resistance rod (94).

10. The balancing device of a multi-stage pump rotor assembly according to claim 7 or 8, characterized in that: It also includes a second balancing positioning mechanism (10), which includes a fastening ball (101) that fits the arc segment (613), the side wall of the fastening ball (101) is fixedly connected to a second push-pull rod (102), the free end of the second push-pull rod (102) is hinged on the fixed seat (103), the fixed seat (103) is fixedly set on the guide limit assembly (615), the side wall of the guide limit assembly (615) is fixedly connected to one end of a connecting spring (104), and the other end of the connecting spring (104) is fixedly connected to the side wall of the second push-pull rod (102).

Images