Immersed pump

Abstract

The invention relates to the technical field of pumps, and discloses an immersed pump which comprises an inducer hub internally provided with an installation cavity, inducer blades installed on the peripheral side of the inducer hub, an installation base detachably installed in the installation cavity, a fixing assembly used for fixedly installing the installation base on the inducer hub, and a balance weight rod. The balance weight rods are mounted on the mounting seat, mounting holes used for containing the balance weight rods are formed in the mounting seat, the balance weight rods are distributed in the circumferential direction of the mounting seat, and the balance weight rods are detachably mounted in the mounting holes. The inducer can be conveniently rebalanced.

Description

Technical Field

[0001] The present application relates to the technical field of pumps, and in particular to a submersible pump. Background Art

[0002] When the inlet pressure of a submersible pump falls below the liquid's vaporization pressure, the liquid partially vaporizes, forming bubbles (cavitation). When these bubbles burst, they create a force that can damage the impeller and pump body. The inducer, located before the main impeller, rotates to initially pressurize the liquid, increasing the pressure before it enters the main impeller and reducing the risk of cavitation.

[0003] In the related art, the blades of the inducer in the submersible pump are designed to be adjustable in order to adapt to different working conditions. In a submersible pump, when the number of blades or pitch of the inducer changes, the inducer must be rebalanced to avoid vibration, noise and mechanical damage caused by uneven mass distribution. The operation of balancing the inducer is to install the inducer on a horizontal axis so that it can rotate freely. Observe the position of the inducer when it is stationary, and the heavier side will naturally droop. Add a counterweight (such as a balance block) to the lighter side, or remove material (such as drilling a hole) on the heavier side. Repeat the above steps until the inducer can be stationary in any position.

[0004] With respect to the above-mentioned related technologies, adding counterweights or drilling holes on the blades requires multiple adjustments. If too many holes are drilled, it is difficult to add weight, which makes the inducer balancing operation more troublesome. Summary of the Invention

[0005] In order to solve the above problems, the present application provides a submersible pump.

[0006] This application provides a submersible pump, which adopts the following technical solution: A submersible pump, comprising: The inducer hub has a mounting cavity inside. The inducer blades are spirally distributed on the outer peripheral side of the inducer hub. The mounting seat is detachably mounted in the mounting cavity. A fixing assembly is used to fix the mounting seat on the inducer hub, The counterweight rod is installed on the mounting seat. The mounting seat is provided with mounting holes for accommodating the counterweight rod and the mounting holes are distributed along the circumference of the mounting seat. The counterweight rod can be detachably installed in the mounting holes.

[0007] By adopting the above technical solution, the mounting seat and the inducer hub can be detachably connected, which facilitates the replacement of the inducer hub with different blades and pitches. The counterweight rod can dynamically balance the entire inducer. The counterweight rod can be extracted or installed to simplify the balance adjustment process of the inducer of the traditional submersible pump as a whole.

[0008] Optionally, the fixing component includes: Two fixing plates, one fixing plate abuts against one end of the inducer hub, and the other fixing plate abuts against the other end of the inducer hub. A fixing rod, one end of which is fixedly connected to one fixing plate, and the other end of which passes through the other fixing plate and the mounting seat. A nut is threadedly connected to the fixing rod, and the nut is in contact with the mounting seat.

[0009] By adopting the above technical solution, the two-stage fixing structure enhances the reliability of the axial fixation of the mounting seat, and the thread locking method is simple.

[0010] Optionally, the inducer hub is spliced ​​in two sections, and the blades after the inducer hub is spliced ​​are distributed in a continuous spiral.

[0011] By adopting the above technical solution, the segmented splicing can be partially replaced, making it easier to maintain the inducer.

[0012] Optionally, the splicing section of one inducer hub is clamped to one of the fixing plates, and the splicing section of the other inducer hub is rotatably connected to the mounting seat.

[0013] By adopting the above technical solution, the inducer hub splicing section can be installed and positioned, and the two inducer hub splicing sections can be spliced ​​and rotated freely relative to each other.

[0014] Optionally, also include: A mounting block is mounted on a splicing section of the inducer hub. The limiting rod rotates the mounting block, The limiting block is fixedly mounted on the splicing section of the other inducer hub. A stopper is fixedly mounted on the mounting block and is used to limit the rotation angle of the limit rod. When one end of the limit rod contacts the limit block, the other end of the limit rod contacts the stopper, and the blade is in a continuous state.

[0015] By adopting the above technical solution, when the rotatable inducer hub splicing section and the limit rod rotate in the same direction, the two inducer hub splicing sections can rotate freely relative to each other; when the rotatable inducer hub splicing section and the limit rod rotate in different directions, when the limit block contacts the limit rod, the limit rod contacts the block, and the limit rod stops rotating. At this time, the inducer hub splicing section can be restricted from continuing to rotate, and the blades on the two inducer hub splicing sections form a continuous state. The inducer hub splicing is completed, and the cooperation of the limit rod and the limit block can prevent the inducer hub from excessive rotation.

[0016] Optionally, the mounting block slides along the circumference of the inducer hub, the inducer hub is provided with a sliding groove for the mounting block to slide, the mounting seat is provided with a connecting groove for communicating with the sliding groove, one end of the counterweight rod abuts against the connecting groove, the mounting block partially extends into the connecting groove and is provided with a socket for inserting the counterweight rod, the counterweight rod is inserted into the mounting block to fix the mounting block on the inducer hub.

[0017] By adopting the above technical solution, the mounting block is fixed on the mounting seat through the insertion of the counterweight rod, which can not only fix the mounting block, but also further improve the connection strength between the inducer wheel hub and the mounting seat. When the inducer hub is assembled and the limit rod no longer needs to cooperate with the limit block, the position of the mounting block can also be changed to increase the weight of part of the inducer so that the mounting block also becomes a counterweight when adjusting the balance of the inducer.

[0018] Optionally, the counterweight rod includes: The main rod has a hollow structure inside, and the main rod and the mounting block are plugged in. The sleeve rod is detachably connected to the main rod.

[0019] By adopting the above technical solution, the main rod is kept connected with the mounting block, and the sleeve rod can leave the main rod, ensuring that the mounting block is stably installed while achieving multi-level counterweight adjustment.

[0020] Optionally, the inducer hub is a frustum-conical structure as a whole.

[0021] By adopting the above technical solution, when the inducer is installed, the diameter of the liquid inlet of the submersible pump is larger than the diameter of the liquid outlet to form a tapered flow channel, which helps to accelerate the fluid smoothly and can further improve the anti-cavitation performance.

[0022] In summary, this application has at least one of the following beneficial effects: 1. The inducer hub can be replaced with different blades and pitches to adapt to different replacements; 2. By adding or removing counterweight rods, the process of adjusting the balance of the inducer can be simplified. The combination of the counterweight rod and the mounting block can also enhance the connection strength between the inducer hub and the mounting base. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application showing that an inducer is installed at the suction port of a submersible pump; Figure 2 This is a schematic diagram of the overall structure of the inducer in an embodiment of the present application; Figure 3 is a cross-sectional view of an embodiment of the present application showing a counterweight rod installed in a mounting seat; Figure 4 This is an exploded schematic diagram of a counterweight rod and a mounting base according to an embodiment of the present application; Figure 5 is a cross-sectional view of a fixed mounting seat and an inducer hub of a fixed assembly according to an embodiment of the present application; Figure 6 This is a schematic diagram of an embodiment of the present application showing an inducer hub having a two-section spliced ​​structure; Figure 7 This is a structural diagram showing the clamping connection between a clamping rod and an inducer hub splicing section in an embodiment of the present application; Figure 8 This is a schematic diagram of the structure of the embodiment of the present application showing the cooperation between the limit rod and the limit block; Figure 9 yes Figure 8 A magnified schematic diagram; Figure 10 This is a cross-sectional view showing the connection between the conduit and the motor housing according to an embodiment of the present application.

[0024] Explanation of the reference numerals: 10. Inducer hub; 11. Mounting cavity; 12. Slide groove; 20. Inducer blade; 30. Mounting seat; 31. Mounting hole; 32. Through hole; 33. Connecting groove; 40. Fixing assembly; 41. Fixing plate; 42. Fixing rod; 43. Nut; 44. Connecting rod; 50. Counterweight rod; 51. Main rod; 52. Sleeve rod; 60. Mounting block; 61. Socket; 70. Limit rod; 80. Limit block; 90. Stop block; 100. Motor housing; 110. Liquid outlet; 200. Motor assembly; 300. Mounting bearing; 400. Tail stock; 500. Liquid outlet diverter pipe; 600. Conduit. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-9 This application is described in further detail.

[0026] The embodiment of the present application discloses a submersible pump. Figure 1 A submersible pump includes an inducer hub 10, inducer blades 20 fixedly mounted on the inducer hub 10, inducer blades 20 are spirally distributed, and the inducer hub 10 is mounted in front of the impeller inlet, close to the suction port of the pump.

[0027] Reference Figure 2 and Figure 3Inducer hub 10 is provided with a mounting cavity 11 inside, and a mounting seat 30 is detachably mounted on inducer hub 10 within mounting cavity 11. Inducer hub 10 may be a cylindrical structure or a truncated cone structure. Inducer hub 10 in the embodiment of the present application is preferably a truncated cone structure. The hollow structure of inducer hub 10 runs through both ends, and mounting seat 30 also has a corresponding truncated cone structure. There is a certain amount of friction between mounting seat 30 and inducer hub 10, and there is also a certain amount of friction between counterweight rod 50 and mounting seat 30, and a slight force is required to separate them.

[0028] Reference Figure 3 and Figure 4 The mounting base 30 is detachably mounted with a counterweight rod 50. One end of the mounting base 30 is provided with a mounting hole 31 for accommodating the counterweight rod 50. The mounting holes 31 are distributed along the circumference of the mounting base 30, and the counterweight rod 50 can be installed in any of the mounting holes 31. The mounting holes 31 are located on the end surface of the mounting base 30 with a larger outer diameter, and do not extend through the end surface of the mounting base 30 with a smaller outer diameter. When the counterweight rod 50 is inserted into the mounting base 30, the entire counterweight rod 50 is located within the mounting base 30.

[0029] Reference Figure 4 The counterweight rod 50 includes a main rod 51 and a sleeve rod 52. The main rod 51 is hollow inside, and the sleeve rod 52 is inserted into the main rod 51. One end of the sleeve rod 52 is connected to a pull ring to facilitate the removal of the sleeve rod 52. The cooperation between the sleeve rod 52 and the main rod 51 can achieve multi-level adjustment.

[0030] When balancing the inducer, the mounting base 30 is provided with a through hole 32 therethrough, and the central axis of the through hole 32 is coaxial with the central axis of the mounting base 30. The inducer hub 10 can be replaced without changing the mounting base 30, and the blade changes and pitches on different inducer hubs 10 are different. After the inducer hub 10 and the mounting base 30 are connected, the entire inducer needs to be rebalanced. The horizontal axis is passed through the through hole 32, and the horizontal axis is coaxial with the mounting base 30, so that the inducer can rotate freely. Observe the static position of the inducer, and the heavier side will naturally droop. Adjust the position of the counterweight rod 50, and install the counterweight rod 50 in a lighter position. Repeat the above steps until the inducer can be stopped at any position, so that when the submersible pump is working, it is not easy to cause vibration, noise, and mechanical damage due to uneven distribution of the inducer.

[0031] When the inducer hub 10 and the mounting seat 30 are connected, the submersible pump further includes a fixing assembly 40 for fixing the mounting seat 30 on the inducer hub 10 .

[0032] The fixing assembly 40 includes two fixing plates 41, each of which has a circular cross-section and has different outer diameters. The outer diameter of one fixing plate 41 is the same as the minimum outer diameter of the inducer hub 10, and the outer diameter of the other fixing plate 41 is the same as the maximum outer diameter of the inducer hub 10. The fixing plate 41 with a smaller outer diameter abuts against the end of the inducer hub 10 with a smaller outer diameter, and the fixing plate 41 with a larger outer diameter abuts against the end of the inducer hub 10 with a larger outer diameter. The fixing assembly 40 also includes a fixing rod 42 and a nut 43. One end of the fixing rod 42 is fixedly connected to the fixing plate 41 with a smaller outer diameter, and the other end of the fixing rod 42 passes through the fixing plate 41 with a larger outer diameter and is threadedly connected to the nut 43. The two fixing plates 41 clamp and fix the inducer hub 10 and the mounting seat 30, so that the inducer hub 10 and the mounting seat 30 are fixedly connected together.

[0033] The end of the counterweight rod 50 contacts the fixing plate 41 . When the two fixing plates 41 are fixedly connected, the counterweight rod 50 is also fixedly installed between the mounting seat 30 and the fixing plate 41 .

[0034] The end surface of the fixing plate 41 with a large outer diameter is also fixedly connected with a sleeve for connecting to the motor output shaft. The nut 43 is located in the sleeve. The sleeve and the motor output shaft are fixedly connected by bolts after being sleeved.

[0035] Further, refer to Figure 6 Inducer hub 10 is constructed of two sections, and the blades are also joined together. The blades of the joined inducer hub 10 form a continuous spiral arrangement. One section of inducer hub 10 slides into mounting base 30 from one end, and the other section of inducer hub 10 slides into mounting base 30 from the other end.

[0036] Reference Figure 7 A clamping rod 44 is connected to the surface of a fixing plate 41 with a very small outer diameter, and a clamping hole is opened at one end of the splicing section of the inducer hub 10 with a small outer diameter. When the clamping rod 44 is inserted into the clamping hole, the splicing section of the inducer hub 10 with a small outer diameter and the fixing plate 41 are clamped together; the splicing section of the inducer hub 10 with a large outer diameter is rotatably installed on the mounting seat 30. When the two sections of the inducer hub 10 are spliced ​​and the blades are continuous, the fixing plate 41 with a large outer diameter is installed to fix the inducer hub 10 and the mounting seat 30.

[0037] Further, refer to Figure 8 and Figure 9The submersible pump further includes a mounting block 60, a limiting rod 70 rotatably mounted on the mounting block 60, and a limiting block 80 fixedly mounted on the splicing section of the inducer hub 10 having a larger outer diameter. The mounting block 60 is mounted on the splicing section of the inducer hub 10 having a smaller outer diameter. A stopper 90 is also mounted on the mounting block 60. Stopper 90 is used to limit the rotation angle of limiting rod 70, so that limiting rod 70 can only rotate in a direction away from stopper 90. When the splicing section of the inducer hub 10 having a larger outer diameter rotates, if the rotation direction of the splicing section of the inducer hub 10 is the same as the rotation direction of limiting rod 70, limiting rod 70 does not affect the rotation of the splicing section of the inducer hub 10. When the rotation direction of the splicing section of the inducer hub 10 is opposite to the rotation direction of limiting rod 70, limiting block 80 and limiting rod 70 contact, and the limiting rod 70 and stopper 90 contact, the splicing section of the inducer hub 10 stops rotating, and the blades are spliced ​​together to form a continuous state.

[0038] Further, refer to Figure 7 and Figure 9 The mounting block 60 slides on the outer peripheral side of the inducer hub 10. The outer peripheral side wall of the inducer hub 10 is provided with a slide groove 12 for the mounting block 60 to slide. The slide groove 12 is an arc-shaped structure. The mounting seat 30 is provided with a connecting groove 33 for communicating with the slide groove 12. The extension length of the slide groove 12 is the same as the extension length of the connecting groove 33. The connecting groove 33 is also connected to the mounting hole 31. One end of the counterweight rod 50 is inserted into the connecting groove 33. There are two corresponding slide grooves 12, and the connecting grooves 33 and the slide grooves 12 correspond one to one. One end of the mounting block 60 is inserted into the connecting groove 33. The part of the mounting block 60 extending into the connecting groove 33 is provided with a socket 61 for the main rod 51 to be inserted. When the main rod 51 and the mounting block 60 form a plug-in relationship, the mounting block 60 is fixed in the slide groove 12. To ensure that main rod 51 remains firmly attached to mounting block 60 and minimize its effect on the overall balance of the inducer, main rod 51 can be inserted into all mounting holes 31. However, some main rods 51 may not necessarily have sleeve rods 52 inserted therein. This allows for both securing mounting block 60 and providing a counterweight. Because portions of counterweight rod 50 are not exposed, both main rod 51 and sleeve rod 52 can be removed from mounting base 30, maintaining a multi-stage counterweight adjustment.

[0039] Limit rod 70 can be inserted into mounting block 60. After the two sections of the inducer hub 10 are assembled, limit rod 70 is removed after completing its positioning function. To rebalance the inducer, mounting block 60 can be moved at will, and mounting block 60 and stop block 90 can also act as a counterweight.

[0040] Reference Figure 10It should also be noted that the submersible pump further comprises a motor housing 100 and a tailstock 400. The motor housing 100 is provided with a motor assembly 200 and a mounting bearing 300. The tailstock 400 is provided with a liquid outlet shunt pipe 500. A conduit 600 is connected to the tailstock 400. One end of the conduit 600 extends into the motor housing 100 and is coaxial with the mounting bearing 300. A liquid outlet hole 110 is provided on the circumference of the motor housing 100. The motor housing 100 is connected to the liquid outlet shunt pipe 500 through the liquid outlet hole 110. When the high-pressure liquid flows into the tailstock 400, pressurized low-temperature liquid enters the motor housing 100 from the conduit 600. The low-temperature liquid is sprayed onto the rear bearing, increasing the cooling and lubrication effect, and also cooling the motor assembly 200. The bearing temperature is reduced, the local vaporization pressure of the liquid decreases, the critical cavitation margin of the inducer is reduced, and cavitation is further suppressed.

[0041] The bearing inner and outer rings are made of 9Cr18mo material and undergo forging, multiple cryogenic treatments, and precision grinding to ensure stable operation at low temperatures. The bearing retainer is based on PTFE with molybdenum disulfide as a lubricant. Polyimide and glass fiber are added to enhance structural strength, ensuring strength and lubricity at low temperatures and extending the bearing's service life.

[0042] The shaft is made of martensitic stainless steel 17-4, which has very similar low-temperature performance to the low-temperature bearing material 9Cr18mo, ensuring that the bearing will not slip at low temperatures. 17-4 also has a yield strength close to that of 9Cr18mo, and has a certain toughness, ensuring that the shaft will not break during long-term use.

[0043] The low-temperature motor uses 0.3mm thin silicon steel sheets and 220℃ temperature-resistant anti-corona enameled wire for copper wire, which reduces eddy current loss and copper heat loss. The entire motor is developed according to low-temperature conditions, with a work efficiency of up to 88.5%. The heat generation at the same volume and power is much lower than that of existing asynchronous motors.

[0044] The implementation principle of a submersible pump in the embodiment of the present application is as follows: After replacing the inducer hub 10 with one suitable for the number of blades and pitch according to the working conditions, the inducer hub 10 is spliced ​​in half on the mounting seat 30. The cooperation of the limit rod 70 and the limit block 80 plays a positioning role, so that the inducer can be quickly spliced. The inducer hub 10 and the mounting seat 30 are connected by friction. First, the inducer is rebalanced as a whole, and the mounting seat 30 is installed on the horizontal axis so that the mounting seat 30 can rotate freely with the inducer hub 10. A sleeve rod 52 is added to the main rod 51 on the lighter side. The position of the counterweight rod 50 and the mounting block 60 can also be adjusted according to the situation so that the inducer can stop at any position. Then, the mounting seat 30 and the inducer hub 10 are further fixed with the fixing assembly 40. Finally, the entire inducer is fixedly connected to the motor output shaft in the submersible pump.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A submersible pump, characterized in that: include: The inducer hub (10) is provided with a mounting cavity (11) therein. Inducer blades (20) are spirally distributed on the outer peripheral side of the inducer hub (10), The mounting seat (30) is detachably mounted in the mounting cavity (11). A fixing assembly (40) is used to fix the mounting seat (30) on the inducer hub (10), A counterweight rod (50) is mounted on the mounting seat (30). The mounting seat (30) is provided with mounting holes (31) for accommodating the counterweight rod (50) and the mounting holes are distributed along the circumference of the mounting seat (30). The counterweight rod (50) is detachably mounted in the mounting holes (31).

2. A submersible pump according to claim 1, characterized in that: The fixing assembly (40) includes, Two fixing plates (41), one fixing plate (41) abuts against one end of the inducer wheel hub (10), and the other fixing plate (41) abuts against the other end of the inducer wheel hub (10). A fixing rod (42), one end of which is fixedly connected to one fixing plate (41), and the other end of which passes through another fixing plate (41) and the mounting seat (30). The nut (43) is threadedly connected to the fixing rod (42), and the nut (43) is in contact with the mounting seat (30).

3. A submersible pump according to claim 2, characterized in that: The inducer hub (10) is spliced ​​in two sections, and the inducer blades (20) after the inducer hub (10) is spliced ​​are distributed in a continuous spiral.

4. A submersible pump according to claim 3, characterized in that: The splicing section of one inducer hub (10) is clamped to one of the fixing plates (41), and the splicing section of the other inducer hub (10) is rotatably connected to the mounting seat (30).

5. A submersible pump according to claim 4, characterized in that: Also includes: The mounting block (60) is mounted on a splicing section of the inducer hub (10), The limiting rod (70) rotates the mounting block (60) upward, The limiting block (80) is fixedly mounted on the splicing section of the other inducer hub (10). A stopper (90) is fixedly mounted on the mounting block (60) and is used to limit the rotation angle of the limiting rod (70). When one end of the limiting rod (70) contacts the limiting block (80), the other end of the limiting rod (70) contacts the stopper (90).

6. A submersible pump according to claim 5, characterized in that: The mounting block (60) slides along the circumference of the inducer hub (10), the inducer hub (10) is provided with a slide groove (12) for the mounting block (60) to slide, the mounting seat (30) is provided with a connecting groove (33) for communicating with the slide groove (12), one end of the counterweight rod (50) abuts against the connecting groove (33), the mounting block (60) partially extends into the connecting groove (33) and is provided with a socket (61) for inserting the counterweight rod (50), the counterweight rod (50) is inserted into the mounting block (60), and is used to fix the mounting block (60) on the inducer hub (10).

7. A submersible pump according to claim 6, characterized in that: The counterweight rod (50) comprises: The main rod (51) has a hollow structure inside, and the main rod (51) and the mounting block (60) are plugged together. The sleeve rod (52) is detachably connected to the main rod (51).

8. The submersible pump according to claim 1, characterized in that: The inducer hub (10) is a truncated cone structure as a whole.

Images