Water outlet assembly of leakage hole and self-balancing multi-stage pump with same

Abstract

The utility model provides a water outlet assembly of a leakage hole and a self-balancing multi-stage pump with the water outlet assembly, and the water outlet assembly based on the leakage hole is formed by a balance bushing (82), a balance shaft sleeve (83), a water outlet section (81), two water outlet leakage holes (811) located in the water outlet section (81) and a bushing leakage hole (821) located in the balance bushing (82). The balance shaft sleeve (83) is installed on a pump shaft (1) of the self-balance multistage pump, the balance bush (82) is fixed in an inner hole of the water outlet section (81) through a screw, the inner circle diameter of the balance bush (82) is larger than the outer circle diameter of the balance shaft sleeve (83), and a sealing gap between the balance bush (82) and the balance shaft sleeve (83) can isolate high-pressure cavities and low-pressure cavities on the two sides of the water outlet section (81). Meanwhile, by means of the flow discharging effect of the leakage hole of the water outlet assembly, the exciting force of sealing fluid in the sealing gap between the balance lining (82) and the balance shaft sleeve (83) can be reduced, and the overall stability of the self-balance multi-stage pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of self-balancing multi-stage centrifugal pumps, in particular to a water outlet component of a leakage hole and a self-balancing multi-stage pump with the component. Background Art

[0002] The self-balancing multistage pump mainly consists of the water inlet section, middle section, water outlet section, secondary water inlet section, positive guide vanes, reverse guide vanes, positive impeller, reverse impeller, pump shaft, transition pipe, bearing body and other parts. During the operation of the self-balancing multistage pump, the pump shaft rotates under the drive of the motor, doing work on the transported fluid to increase its energy, so that the required amount of fluid is continuously delivered from the suction pool through the water inlet section, positive impeller, positive guide vanes, middle section, horizontal outlet of the water outlet section, transition pipe, secondary water inlet section, reverse impeller, reverse guide vanes, and vertical outlet of the water outlet section.

[0003] The two sides of the outlet section of the self-balancing multi-stage pump are high-pressure water with different pressures. In order to effectively prevent the high-pressure water with different pressures on both sides of the outlet section from entering the other side of the outlet section from one side of the outlet section, a sealing structure in which a balancing bushing and a balancing shaft sleeve are matched is often adopted. The sealing fluid entering between the balancing bushing and the balancing shaft sleeve will produce a strong rotation effect and excitation effect under the rotation of the balancing shaft sleeve, and then generate a violent sealing fluid excitation force acting on the rotor system, which is the main reason for the sub-resonance instability of the rotor system of the whole pump unit, and directly affects the operating stability of the whole pump unit.

[0004] In view of this, in order to solve the technical problem of the sealing fluid excitation force in the seal-rotor system of the self-balancing multi-stage pump on the operating stability of the entire pump unit, and to avoid the rotor instability and unit vibration caused by the sealing fluid excitation effect between the balancing bushing and the balancing sleeve, there is an urgent need for a water outlet component with a leakage hole and a self-balancing multi-stage pump having the component. Summary of the invention

[0005] In view of the above technical difficulties, the utility model proposes a water outlet component with a leakage hole, and installs the water outlet component on a self-balancing multi-stage centrifugal pump. The leakage hole of the water outlet component solves the sealing fluid excitation effect between the balancing bushing and the balancing shaft sleeve, and at the same time balances the axial force generated during the operation of the self-balancing multi-stage centrifugal pump, thereby ensuring the stable operation of the self-balancing multi-stage centrifugal pump.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A water outlet component of a leakage hole comprises a water outlet section, a balancing bushing and a balancing shaft sleeve, wherein the balancing shaft sleeve is installed on a pump shaft by means of a common flat key, the outer circumferential surface of the balancing shaft sleeve is embedded in the inner hole of the water outlet section, the balancing bushing is fixed in the inner hole of the water outlet section by means of screws, the inner circumferential diameter of the balancing bushing is larger than the outer circumferential diameter of the balancing shaft sleeve, and the length of the sealing gap between the balancing bushing and the balancing shaft sleeve depends on the sealing gap pressure difference and the sealing gap size.

[0008] Furthermore, two water outlet leakage holes are provided in the inner cavity of the water outlet section, and the two water outlet leakage holes are located on the horizontal plane of the inner cavity axis of the water outlet section, and the two water outlet leakage holes are symmetrically distributed, and the axial direction of the water outlet leakage holes is horizontal, one end of each leakage hole is connected to the inner cavity composed of the water outlet section and the balancing bushing, and the other end of each leakage hole is connected to the water inlet cavity of the water outlet section.

[0009] Furthermore, the longitudinal cross-section of the balancing bushing is L-shaped, a flange is arranged at the end of the balancing bushing, the balancing bushing is fixed to the inner hole of the water outlet section by screws, a bushing groove is arranged on the outer circular surface of the balancing bushing, a bushing rectangular groove is arranged at a position of the inner circle of the balancing bushing away from the flange, a plurality of annular bushing trapezoidal grooves are arranged between the inner circle of the balancing bushing and the bushing rectangular groove, the depth of the bushing trapezoidal groove is smaller than the depth of the bushing rectangular groove, the groove width of the bushing trapezoidal groove is smaller than the groove width of the bushing rectangular groove, and four bushing leakage holes are evenly arranged at the axial middle position of the balancing bushing along the circumferential direction of the balancing bushing.

[0010] Furthermore, a sleeve groove is provided on the inner circular surface of the balancing sleeve, a sleeve large rectangular groove is provided on the outer circular surface of the balancing sleeve near one end face, the sleeve large rectangular groove of the balancing sleeve matches with the sleeve rectangular groove of the balancing bushing, a plurality of sleeve small rectangular grooves are provided on one side of the sleeve large rectangular groove, the sleeve small rectangular grooves match with the smooth inner circular surface of the balancing bushing, a plurality of sleeve trapezoidal grooves are provided on the other side of the sleeve large rectangular groove, the sleeve trapezoidal grooves match with the bushing trapezoidal grooves.

[0011] A self-balancing multistage pump with a water outlet assembly having a leakage hole, comprising a pump shaft, a coupling, a bearing assembly A, a filler A, a water inlet section, a positive flow component, a positive final flow component, a water outlet assembly, a reverse final flow component, a reverse flow component, a secondary water inlet section, a filler assembly B, a bearing assembly B, a through rod and a transition pipe, wherein the coupling is installed at the end of the pump shaft, the pump shaft is installed in the bearing assembly A and the bearing assembly B, the water inlet section, the positive flow component, the positive final flow component, the water outlet assembly, the reverse final flow component, the secondary water inlet section, the filler assembly B, the bearing assembly B, a through rod and a transition pipe, The flow assembly, the reverse flow assembly and the secondary water inlet section are compressed by the through rod to form an integral body installed on the pump shaft and are located between the bearing assembly A and the bearing assembly B. The packing assembly B is fixed to the right side of the secondary water inlet section by screws and the bearing assembly B is fixed to the right side of the packing assembly B by screws. The packing A is arranged in the packing cavity between the water inlet section and the pump shaft. One ends of the two transition pipes are respectively connected to the water outlet of the water outlet section, and the other ends of the two transition pipes are connected to the water inlet of the secondary water inlet section.

[0012] Further, the bearing assembly B is provided with two angular contact ball bearings installed back to back, and the bearing assembly B is provided with a cylindrical roller bearing.

[0013] Compared with the prior art, the utility model provides a water outlet component with a leakage hole and a self-balancing multi-stage pump having the component. Through the leakage effect of the sleeve leakage hole of the balancing sleeve and the water outlet leakage hole of the water outlet section, the sealing exciting force of the sealing fluid between the balancing sleeve and the balancing shaft sleeve can be effectively reduced, thereby improving the stability of the seal-rotor system and the entire pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall structure diagram of the utility model;

[0015] Figure 2 for Figure 1 Left view of

[0016] Figure 3 for Figure 1 A partial enlarged view of part A;

[0017] Figure 4 This is a schematic diagram of the water outlet section structure of the utility model;

[0018] Figure 5 for Figure 4 Cross-sectional view of PP;

[0019] Figure 6 A three-dimensional diagram of the balancing bushing of the utility model;

[0020] Figure 7 It is a three-dimensional diagram of the balancing sleeve of the utility model.

[0021] Markings in the figure are: 1: pump shaft; 2: coupling; 3: bearing assembly A; 4: packing A; 5: water inlet section; 6: positive flow assembly; 7: positive final flow assembly; 8: water outlet assembly; 81: water outlet section; 811: water outlet leakage hole; 812: water outlet section outlet; 82: balancing bushing; 821: bushing leakage hole; 822: bushing trapezoidal groove; 823: bushing rectangular groove; 824: bushing groove; 83: balancing shaft sleeve; 831: shaft sleeve trapezoidal groove; 832: shaft sleeve large rectangular groove; 833: shaft sleeve small rectangular groove; 834: shaft sleeve groove; 9: reverse final flow assembly; 10: reverse flow assembly; 11: transition pipe; 12: secondary water inlet section; 13: packing assembly B; 14: bearing assembly B; 15: through bar. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] In order to make the technical problems, technical solutions and implementation effects to be solved by the present utility model clearer, the following is a summary of the technical problems, technical solutions and implementation effects of the present utility model. Figure 1-7 , an embodiment of the utility model is further described:

[0024] See attached Figure 1-7 The utility model is a water outlet assembly of a leakage hole, comprising a water outlet section 81, a balancing bushing 82 and a balancing shaft sleeve 83, such as Figure 3 As shown, the balancing sleeve 83 is installed on the pump shaft 1 by means of a common flat key, the outer cylindrical surface of the balancing sleeve 83 is embedded in the inner hole of the water outlet section 81, and the balancing bushing 82 is fixed in the inner hole of the water outlet section 81 by screws. The inner diameter of the balancing sleeve 82 is larger than the outer diameter of the balancing sleeve 83, and the length of the sealing gap between the balancing sleeve 82 and the balancing sleeve 83 depends on the sealing gap pressure difference and the sealing gap size.

[0025] As a preferred embodiment, the inner cavity of the water outlet section 81 is provided with two water outlet leakage holes 811, the two water outlet leakage holes 811 are located on the horizontal plane of the inner cavity axis of the water outlet section 81, and the two water outlet leakage holes 811 are symmetrically distributed, and the axial direction of the water outlet leakage holes 811 is horizontal, one end of each leakage hole is connected to the inner cavity composed of the water outlet section 81 and the balancing bushing 82, and the other end of each leakage hole is connected to the water inlet cavity of the water outlet section 81, and the diameter of the leakage hole depends on the pressure difference on both sides of the water outlet section 81.

[0026] As a preferred embodiment, the longitudinal cross-section of the balancing bushing 82 is L-shaped, a flange is provided at the end of the balancing bushing 82, and the balancing bushing 82 is fixed to the inner hole of the water outlet section 81 by screws. A bushing groove 824 is provided on the outer circular surface of the balancing bushing 82, and a bushing rectangular groove 823 is provided at the position of the inner circle of the balancing bushing 82 away from the flange. The high-pressure water entering between the balancing bushing 82 and the balancing shaft sleeve 83 from the low-pressure side of the water outlet section 81 can play a buffering role when passing through the bushing rectangular groove 823, thereby reducing the flow rate of the high-pressure water. A plurality of annular bushing trapezoidal grooves 822 are provided between the inner circle of the balancing bushing 82 and the bushing rectangular groove 823, and the depth of the bushing trapezoidal groove 822 is less than The depth of the bushing rectangular groove 823 and the groove width of the bushing trapezoidal groove 822 are smaller than the groove width of the bushing rectangular groove 823. Four bushing leakage holes 821 are evenly arranged at the axial middle position of the balancing bushing 82 along the circumferential direction of the balancing bushing 82. The sealing fluid between the balancing bushing 82 and the balancing shaft sleeve 83 will flow into the inner cavity between the water outlet section 81 and the balancing bushing 82 along the bushing leakage hole 821 of the balancing bushing 82, and then enter the water inlet cavity of the water outlet section 81 along the water outlet leakage hole 811 of the water outlet section 81, thereby reducing the sealing fluid excitation force between the balancing bushing 82 and the balancing shaft sleeve 83, and avoiding unstable operation of the seal-rotor system due to the sealing fluid excitation force.

[0027] As a preferred embodiment, a sleeve groove 834 is provided on the inner circular surface of the balancing sleeve 83, and a sleeve large rectangular groove 832 is provided on the outer circular surface of the balancing sleeve 83 near one end surface. The sleeve large rectangular groove 832 of the balancing sleeve 83 cooperates with the sleeve rectangular groove 823 of the balancing bushing 82 to form a buffer cavity for high-pressure water entering the low-pressure side of the water outlet section 81 between the balancing bushing 82 and the balancing sleeve 83. A plurality of sleeve small rectangular grooves 833 are provided on one side of the sleeve large rectangular groove 832. The sleeve small rectangular grooves 833 cooperate with the smooth inner circular surface of the balancing bushing 82 to first reduce the pressure and speed of the high-pressure water. A plurality of sleeve trapezoidal grooves 831 are provided on the other side of the sleeve large rectangular groove 832. The sleeve trapezoidal grooves 831 cooperate with the sleeve trapezoidal grooves 822 to form an annular dynamic seal to prevent the high-pressure water on both sides of the water outlet section 81 from being connected.

[0028] See attached Figure 1-7The self-balancing multistage pump with a water outlet assembly having a leakage hole comprises a pump shaft 1, a coupling 2, a bearing assembly A 3, a packing A 4, a water inlet section 5, a positive flow component 6, a positive final flow component 7, a water outlet assembly 8, a reverse final flow component 9, a reverse flow component 10, a secondary water inlet section 12, a packing assembly B 13, a bearing assembly B 14, a through rod 15 and a transition pipe 11, wherein the coupling 2 is installed at the end of the pump shaft 1, the pump shaft 1 is installed in the bearing assembly A 3 and the bearing assembly B 14, the water inlet section 5, the positive flow component 6, the positive final flow component 7, the water outlet assembly 8, the reverse final flow component 9, the reverse flow component 10, the secondary water inlet section 12, the packing assembly B 13, the bearing assembly B 14, the through rod 15 and the ... The overflow component 9, the reverse overflow component 10 and the secondary water inlet section 12 are compressed by the through rod 15 to form an integral body installed on the pump shaft 1 and are located between the bearing component A 3 and the bearing component B 14. The packing component B 13 is fixed to the right side of the secondary water inlet section 12 by screws and the bearing component B 14 is fixed to the right side of the packing component B 13 by screws. The packing A 4 is arranged in the packing cavity between the water inlet section 5 and the pump shaft 1. One end of the two transition pipes 11 is respectively connected to the water outlet 812 of the water outlet section 81, and the other end of the two transition pipes 11 is connected to the water inlet of the secondary water inlet section 12.

[0029] As a preferred embodiment, the bearing assembly B 14 is provided with two angular contact ball bearings installed back to back, which can bear the residual axial force generated when the whole pump is running. The bearing assembly B 14 is provided with a cylindrical roller bearing, which can bear the radial load of the whole pump.

[0030] The utility model discloses a self-balancing multistage pump with a water outlet assembly having a leakage hole. When the self-balancing multistage pump is in operation, the high-pressure water on the right side of the water outlet assembly 8 will enter the sealing gap between the balancing bushing 82 and the balancing shaft sleeve 83 along the radial gap between the two, and the high-pressure water on the left side of the water outlet assembly 8 (compared with the high-pressure water on the right side of the water outlet assembly 8, the fluid pressure here is lower) will also enter the gap between the balancing bushing 82 and the balancing shaft sleeve 83. Due to the small rectangular groove 833 of the sleeve between the smooth inner circle of the balancing bushing 82 and the outer circle of the balancing shaft sleeve 83, the sleeve rectangular groove 823 of the balancing bushing 82 and the shaft of the balancing shaft sleeve 83, the sealing gap between the balancing bushing 82 and the shaft of the balancing shaft sleeve 83 is formed. The large rectangular groove 832, the sleeve trapezoidal groove 822 of the balancing bushing 82, and the sleeve trapezoidal groove 831 of the balancing shaft sleeve 83 jointly form a dynamic seal, and the sealing fluid between the balancing bushing 82 and the balancing shaft sleeve 83 will produce a violent sealing excitation effect, and then through the sleeve leakage hole 821 of the balancing bushing 82 of the utility model and the water outlet leakage hole 811 of the water outlet section 81, the sealing fluid between the balancing bushing 82 and the balancing shaft sleeve 83 is introduced into the water inlet cavity of the water outlet section 81, thereby weakening the sealing excitation effect of the sealing fluid, and at the same time, it can also weaken the residual axial force generated by the self-balancing multi-stage pump.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water outlet assembly of a leakage hole, comprising a water outlet section (81), a balancing bushing (82) and a balancing shaft sleeve (83), characterized in that: The balancing sleeve (83) is mounted on the pump shaft (1) by means of a common flat key, the outer circumferential surface of the balancing sleeve (83) is embedded in the inner hole of the water outlet section (81), the balancing bushing (82) is fixed in the inner hole of the water outlet section (81) by means of screws, the inner diameter of the balancing bushing (82) is larger than the outer diameter of the balancing sleeve (83), and the length of the sealing gap between the balancing bushing (82) and the balancing sleeve (83) depends on the sealing gap pressure difference and the size of the sealing gap.

2. A water outlet assembly for a leakage hole according to claim 1, characterized in that: Two water outlet leakage holes (811) are arranged in the inner cavity of the water outlet section (81); the two water outlet leakage holes (811) are located on a horizontal plane of the inner cavity axis of the water outlet section (81), and the two water outlet leakage holes (811) are symmetrically distributed; the axial directions of the water outlet leakage holes (811) are in a horizontal state; one end of each leakage hole is connected to the inner cavity formed by the water outlet section (81) and the balancing bushing (82); and the other end of each leakage hole is connected to the water inlet cavity of the water outlet section (81).

3. The water outlet assembly of the leakage hole according to claim 1, characterized in that: The longitudinal cross section of the balancing bushing (82) is L-shaped. A flange is provided at the end of the balancing bushing (82). The balancing bushing (82) is fixed to the inner hole of the water outlet section (81) by means of screws. A bushing groove (824) is provided on the outer circumferential surface of the balancing bushing (82). A bushing rectangular groove (823) is provided at a position of the inner circumference of the balancing bushing (82) away from the flange. A plurality of annular bushing trapezoidal grooves (822) are provided between the inner circumference of the balancing bushing (82) and the bushing rectangular groove (823). The depth of the bushing trapezoidal groove (822) is less than the depth of the bushing rectangular groove (823). The groove width of the bushing trapezoidal groove (822) is less than the groove width of the bushing rectangular groove (823). Four bushing leakage holes (821) are evenly provided at the axial middle position of the balancing bushing (82) along the circumferential direction of the balancing bushing (82).

4. The water outlet assembly of the leakage hole according to claim 1, characterized in that: A sleeve groove (834) is provided on the inner circular surface of the balancing sleeve (83); a sleeve large rectangular groove (832) is provided on the outer circular surface of the balancing sleeve (83) near one end surface; the sleeve large rectangular groove (832) of the balancing sleeve (83) matches with the sleeve rectangular groove (823) of the balancing sleeve (82); a plurality of sleeve small rectangular grooves (833) are provided on one side of the sleeve large rectangular groove (832); the sleeve small rectangular grooves (833) match with the smooth inner circular surface of the balancing sleeve (82); a plurality of sleeve trapezoidal grooves (831) are provided on the other side of the sleeve large rectangular groove (832); the sleeve trapezoidal grooves (831) match with the sleeve trapezoidal grooves (822).

5. A self-balancing multistage pump having a water outlet assembly with a leakage hole, comprising a pump shaft (1), a coupling (2), a bearing assembly A (3), a filler A (4), a water inlet section (5), a positive flow component (6), a positive final flow component (7), a water outlet assembly (8), a reverse final flow component (9), a reverse flow component (10), a secondary water inlet section (12), a filler assembly B (13), a bearing assembly B (14), a through rod (15) and a transition pipe (11), characterized in that: The coupling (2) is mounted on the end of the pump shaft (1), the pump shaft (1) is mounted in the bearing assembly A (3) and the bearing assembly B (14), the water inlet section (5), the positive flow component (6), the positive final flow component (7), the water outlet component (8), the reverse final flow component (9), the reverse flow component (10) and the secondary water inlet section (12) are compressed by a through rod (15) to form an integral body mounted on the pump shaft (1) and located between the bearing assembly A (3) and the bearing assembly B (14). The packing component B (13) is fixed to the right side of the secondary water inlet section (12) by screws, and the bearing component B (14) is fixed to the right side of the packing component B (13) by screws. The packing component A (4) is arranged in the packing cavity between the water inlet section (5) and the pump shaft (1). One ends of the two transition pipes (11) are respectively connected to the water outlet (812) of the water outlet section (81), and the other ends of the two transition pipes (11) are connected to the water inlet of the secondary water inlet section (12).

6. A self-balancing multi-stage pump with a water outlet assembly having a leakage hole according to claim 5, characterized in that: The bearing assembly B (14) is provided with two angular contact ball bearings installed back to back, and the bearing assembly B (14) is provided with a cylindrical roller bearing.

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