Low-flow multistage pump

Abstract

The utility model discloses a low flow multistage pump, including inhale section, middle section, spout section, bearing part and shaft, middle section installs between inhale section and spout section, bearing part installs in spout section right side, shaft rotation is connected in bearing part, and shaft stretches into inhale section, middle section and spout section, and first stage impeller, secondary impeller, secondary guide vane and last guide vane are installed in proper order on the shaft, and secondary impeller is at least two, and spout section right side is installed with sealing part, and spout section is installed with throat bushing, and shaft is rotatably arranged in throat bushing, and first through -hole is seted up on inhale section, and second through -hole is seted up on spout section, and first through -hole and second through -hole are communicated through balance pipe, and spout section has water cooling cavity. The utility model has solved the low efficiency of low flow pump in the prior art, and the problems such as pressure is limited, use scene is limited, operation is unstable, overhauling is difficult, manufacturing cost is high, and long period etc.

Description

Technical Field

[0001] This utility model relates to the field of multistage pump technology, and in particular to a small-flow multistage pump. Background Technology

[0002] Currently, traditional single-stage cantilever pumps have only one impeller, and the impeller diameter is smaller than that of multistage pumps, thus limiting their pressure capacity. In applications requiring high-pressure delivery and large spans, their performance is restricted. Under low flow conditions, excessive shaft deflection causes vertical losses between the sealing surfaces. Long-term operation leads to wear on pump components, reducing the pump's lifespan. For multistage pumps, very few can operate stably at low flow rates due to their narrower flow channels.

[0003] In view of the problems existing in the above-mentioned existing technologies, it is necessary to research and design a new type of small-flow segmental multistage pump to overcome the problems existing in the existing technologies. Utility Model Content

[0004] The purpose of this invention is to provide a small-flow multistage pump to solve the problems existing in the prior art and enable it to be applied to a wider range of working conditions.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a small-flow multistage pump, comprising:

[0006] Intake section, intermediate section, discharge section, bearing components, and shaft;

[0007] There is at least one intermediate section, which is installed between the suction section and the discharge section. The bearing assembly is installed on the right side of the discharge section. The shaft is rotatably connected inside the bearing assembly and extends into the suction section, the intermediate section, and the discharge section. A first-stage impeller, a second-stage impeller, a second-stage guide vane, and a final-stage guide vane are sequentially installed on the shaft. There are at least two second-stage impellers. A sealing component is installed on the right side of the discharge section. A throat bushing is installed inside the discharge section. The shaft is rotatably disposed within the throat bushing. An impeller nut is installed on the shaft and engages with the first-stage impeller. A first through hole is provided on the suction section, and a second through hole is provided on the discharge section. The first through hole and the second through hole are connected by a balance pipe. The discharge section has a water-cooling chamber.

[0008] Preferably, a balancing sleeve is installed in the discharge section, and a balancing drum is installed on the shaft. The balancing sleeve and the balancing drum cooperate, and the balancing drum cooperates with the secondary impeller.

[0009] Preferably, a housing sealing ring is installed inside both the suction section and the middle section, and an impeller sealing ring is installed outside both the first-stage impeller and the second-stage impeller, with the housing sealing ring and the impeller sealing ring cooperating.

[0010] Preferably, the bearing component is equipped with a support leg.

[0011] The present invention discloses the following technical effects:

[0012] 1. In this device, the multi-stage impellers and guide vanes, connected in stages, allow for smoother liquid flow within the pump, reducing flow losses and improving pump efficiency. It optimizes the liquid flow direction, ensuring a more stable transition from one impeller stage to the next, avoiding liquid impact and vortex formation, thereby reducing energy loss.

[0013] 2. In this device, the balance tube can ensure the balance of axial forces.

[0014] 3. In this device, a water-cooled chamber is added to the discharge section. During the operation of the pump, heat is generated due to gas extraction and motor operation. The circulating water in the water-cooled chamber can absorb and remove this heat, ensuring that the pump body temperature is maintained at a low level. This reduces the temperature of key components inside the pump, avoids damage, deformation or performance degradation of components due to high temperature, extends the service life of components, and improves stability. A stable operating temperature can reduce the impact of thermal expansion and contraction of the pump body, ensuring the stability and reliability of pump operation.

[0015] 4. This utility model solves the problems of low efficiency, limited pressure, limited application scenarios, unstable operation, difficult maintenance, high manufacturing cost, and long cycle of small flow pumps in the prior art. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the small-flow multistage pump of this utility model;

[0018] Figure 2 This is a schematic diagram of the balance drum structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the balance sleeve structure of this utility model;

[0020] The components are as follows: 1. Inlet section; 2. First stage impeller; 3. Second stage impeller; 4. Intermediate section; 5. Second stage guide vane; 6. Last stage guide vane; 7. Exit section; 8. Balance pipe; 9. Sealing components; 10. Shaft; 11. Bearing components; 12. Impeller nut; 13. Impeller sealing ring; 14. Shell sealing ring; 15. Balance sleeve; 16. Balance drum; 17. Throat bushing; 18. Support leg. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1-3 This utility model provides a small flow multistage pump, comprising:

[0024] Intake section 1, intermediate section 4, discharge section 7, bearing assembly 11, and shaft;

[0025] There is at least one intermediate section 4, which is installed between the suction section 1 and the discharge section 7. The bearing component 11 is installed on the right side of the discharge section 7. The shaft 10 is rotatably connected to the bearing component 11 and extends into the suction section 1, intermediate section 4 and discharge section 7. The first stage impeller 2, the second stage impeller 3, the second stage guide vane 5 and the last stage guide vane 6 are installed on the shaft 10 in sequence. There are at least two second stage impellers 3. A sealing component 9 is installed on the right side of the discharge section 7. A throat bushing 17 is installed in the discharge section 7. The shaft 10 is rotatably set in the throat bushing 17. An impeller nut 12 is installed on the shaft 10 and cooperates with the first stage impeller 2. A first through hole is opened on the suction section 1 and a second through hole is opened on the discharge section 7. The first through hole and the second through hole are connected by a balance pipe 8. The discharge section 7 has a water-cooling chamber.

[0026] The scheme is further optimized by installing a balance sleeve 15 inside the discharge section 7 and a balance drum 16 on the shaft. The balance sleeve 15 and the balance drum 16 cooperate with each other, and the balance drum 16 cooperates with the secondary impeller 3.

[0027] The design was further optimized by installing a shell sealing ring 14 inside the suction section 1 and the middle section 4, and an impeller sealing ring 13 outside the first stage impeller 2 and the second stage impeller 3. The shell sealing ring 14 and the impeller sealing ring 13 are fitted together.

[0028] The design was further optimized by installing support legs 18 on the bearing components.

[0029] In this device, the sealing component 9 and the balance sleeve 15 are mounted on the discharge section 7, the throat bushing 17 is welded to the discharge section 7, one impeller sealing ring 13 is welded to the first-stage impeller 2, and the rest are welded to the secondary impeller 3; after the shell sealing ring 14 is welded to the suction section 1 and the rest are welded to the middle section 4, the balance drum 16, the final stage guide vane 6, each secondary impeller 3, the middle section 4, the secondary guide vane 5, the first-stage impeller 2, and the impeller nut 12 are sequentially mounted on the shaft 10 from the non-drive side, the suction section 1 is combined with the above-assembled components, the support leg 18 is mounted on the bearing component 11, and finally the balance tube 8 is assembled.

[0030] like Figure 1 As shown, the balance drum 16 is mounted on the shaft 10, and the balance sleeve 15 is mounted on the discharge section 7. This ensures axial force balance and forms a radial gap between the balance sleeve and the balance drum, which plays a throttling role, reducing the amount of water leaking from the high-pressure area in front of the balance drum to the balance chamber and improving the pump efficiency.

[0031] The balancing sleeve 15, balancing drum 16, and balancing pipe 8 ensure axial force balance. The balancing drum 16 is a cylindrical piston installed behind the final stage guide vane 6, behind which is the balancing chamber, which is connected to the inlet pipe via the balancing pipe 8. A significant pressure difference exists on both sides of the balancing drum 16, which is used to balance the axial thrust pointing towards the inlet. A radial clearance is formed between the balancing sleeve 15 and the balancing drum 16, acting as a throttling mechanism to reduce the amount of water leaking from the high-pressure area before the balancing drum 16 into the balancing chamber, thereby improving pump efficiency.

[0032] The impeller sealing ring 13 and the casing sealing ring 14 prevent direct contact between the impeller and the pump casing, thus protecting them. When the sealing rings wear out, they can be repaired or replaced to restore the normal assembly clearance, which is both economical and convenient for maintenance.

[0033] The discharge section 7 is equipped with a water-cooled chamber. During operation, the pump generates heat due to gas extraction and motor operation. The circulating water in the water-cooled chamber absorbs and removes this heat, ensuring that the pump body temperature is maintained at a low level. This reduces the temperature of key components inside the pump, preventing damage, deformation, or performance degradation caused by high temperatures, extending the service life of components, and improving stability. A stable operating temperature reduces the impact of thermal expansion and contraction of the pump body, ensuring the stability and reliability of pump operation.

[0034] Bearing component 11 uses a universal bearing housing from Leo Pumps, and the sealing cavity meets API standards, giving the sealing cavity good interchangeability and versatility. This facilitates the installation, maintenance, and replacement of sealing components 9, reducing the procurement and maintenance costs of the equipment.

[0035] This invention solves the problems of low efficiency, limited pressure, limited application scenarios, unstable operation, difficult maintenance, high manufacturing cost, and long cycle of existing small flow pumps.

[0036] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A low-flow-rate multistage pump, characterized in that, include: The intake section (1), the middle section (4), the discharge section (7), the bearing assembly (11), and the shaft; There is at least one intermediate section (4), which is installed between the suction section (1) and the discharge section (7). The bearing component (11) is installed on the right side of the discharge section (7). The shaft (10) is rotatably connected to the bearing component (11). The shaft (10) extends into the suction section (1), the intermediate section (4), and the discharge section (7). A first-stage impeller (2), a second-stage impeller (3), a second-stage guide vane (5), and a final-stage guide vane (6) are sequentially installed on the shaft (10). The second-stage impeller (3) is at least one... Two, a sealing component (9) is installed on the right side of the discharge section (7), a throat bushing (17) is installed inside the discharge section (7), the shaft (10) is rotatably disposed inside the throat bushing (17), an impeller nut (12) is installed on the shaft (10), the impeller nut (12) cooperates with the first stage impeller (2), a first through hole is opened on the suction section (1), a second through hole is opened on the discharge section (7), the first through hole and the second through hole are connected through a balance pipe (8), and a water cooling chamber is provided inside the discharge section (7).

2. The small-flow multistage pump according to claim 1, characterized in that: A balance sleeve (15) is installed inside the discharge section (7), and a balance drum (16) is installed on the shaft. The balance sleeve (15) and the balance drum (16) cooperate, and the balance drum (16) cooperates with the secondary impeller (3).

3. A small-flow multistage pump according to claim 1, characterized in that: A housing sealing ring (14) is installed in both the suction section (1) and the middle section (4), and an impeller sealing ring (13) is installed on the outside of both the first-stage impeller (2) and the second-stage impeller (3). The housing sealing ring (14) and the impeller sealing ring (13) cooperate with each other.

4. A small-flow multistage pump according to claim 1, characterized in that: The bearing component is equipped with a support leg (18).

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