CN115095527A - Axial force self-balancing high-pressure centrifugal pump - Google Patents

Axial force self-balancing high-pressure centrifugal pump Download PDF

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Publication number
CN115095527A
CN115095527A CN202210790318.9A CN202210790318A CN115095527A CN 115095527 A CN115095527 A CN 115095527A CN 202210790318 A CN202210790318 A CN 202210790318A CN 115095527 A CN115095527 A CN 115095527A
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pump
centrifugal pump
double
axial force
motor
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CN202210790318.9A
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江智军
韩杨杨
李山钊
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Nanchang University
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Nanchang University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

An axial force self-balancing high-pressure centrifugal pump comprises a double-shaft extension motor, two symmetrical centrifugal pumps and double-inlet and double-outlet runners. One end of the double-shaft stretching motor is directly connected with the centrifugal pump I, and the other end of the double-shaft stretching motor is directly connected with the centrifugal pump II; or one end of the double-shaft extension motor is connected with the centrifugal pump I through a coupler, and meanwhile, the other end of the double-shaft extension motor is connected with the centrifugal pump II through a coupler. The axial forces of the symmetrical pumps are mutually offset, no axial float, no balance water leakage, no seal water leakage and no volume loss caused by the axial force balancing device are generated during operation, the operation efficiency of the pump is integrally improved, and the service life of the pump is prolonged. The pump has no additional axial force balancing device, the flow channel process is simple, and the manufacturing cost is low. The dual pump heads can be operated in series or in parallel as required by the flow and head ranges.

Description

Axial force self-balancing high-pressure centrifugal pump
Technical Field
The invention belongs to the technical field of centrifugal pumps, and relates to axial force balance of a high-pressure centrifugal pump.
Background
The centrifugal water pump can produce axial thrust at the actual operation in-process, if eliminate axial thrust in time, will produce impact and vibration to the water pump, leads to whole water pump to scrap when serious.
The axial thrust is caused by three reasons: (1) the pressures acting on the front and rear disks of the impeller are not balanced. The pressure at the inlet of the impeller is low pressure p1, the pressure at the outlet is high pressure p2, and p2> p 1. When the impeller rotates, high-pressure water flowing out of the impeller flows back to the outer sides of the front disc and the rear disc of the impeller through a part of the gap. It can be shown that the pressure of the water filling the back chamber of the impeller varies according to the parabolic law with the radius R. In the range from the radius R2 of the impeller to the radius R1, the pressures on the front wheel disc and the rear wheel disc are symmetrically distributed and offset, in the range from the radius R1 of the impeller to the radius Rg of the hub, the pressure acting on the left side of the impeller is inlet low pressure, and the pressure acting on the right side of the impeller is outlet high pressure, so that the pressures acting on the two sides of the impeller are unbalanced, and axial thrust for moving the impeller to the water inlet side is generated. This axial thrust is the major component of the total axial thrust of the water pump. (2) The amount of water flow in the impeller changes. (3) The large and small orifice rings are seriously worn. Wherein, the pressure intensity on the front and back wheel discs of the impeller is unbalanced, which is the main reason for generating the axial thrust. The direction of the total axial thrust is along the axial direction of the water pump and is directed to the water suction side.
With the increase of the number of pump stages and the increase of the lift, the axial force acting on the pump is larger due to the accumulation of the axial force on each stage of impeller, even more than one hundred kilonewtons or more, and the harm of the axial force is more obvious. If the axial force of the pump cannot be balanced sufficiently, the axial movement of the rotor is caused inevitably, and the centrifugal pump cannot run normally.
Currently, there are many ways to balance axial thrust, and there are several commonly used methods [ copper engineering, 2016(01):84-85+ 95; general purpose machine, 2017(10) 38-40 (1) balance hole and balance tube. Must be used in conjunction with thrust bearings. In addition, the method can increase the leakage of the water pump and slightly reduce the efficiency, and is generally used for small single-suction single-stage centrifugal water pumps. (2) Balance disk device. The multi-stage segment centrifugal water pump uses a balance disc device to balance the axial thrust. The balance disc device has the disadvantages that the balance disc is easy to wear, the leakage quantity is increased after the wear, and the efficiency of the pump is reduced. (3) The horizontal split type multistage centrifugal pump adopts a mode of symmetrical arrangement of impellers to balance most of axial force, adopts a mode of combining a balance pipe and a pressure relief sleeve to balance a small part of axial force caused by factors such as an upper shaft sleeve of a pump rotor, and simultaneously adopts a pair of thrust bearings to balance residual micro axial force. Other factors such as operating conditions, pillow blocks, bushings, shaft seals, and manufacturing assembly errors also cause the generation of axial forces, which are dynamic and whose magnitude can rarely be calculated theoretically. In the horizontal split type multistage centrifugal pump, the axial force caused by a shaft sleeve, a shaft shoulder and the like on a rotor can be balanced by adopting the combination of a balance pipe and a pressure relief sleeve. This method will increase the leakage of the water pump and decrease the efficiency slightly. The horizontal split multi-stage centrifugal pump has a complex pump body structure and high manufacturing cost although the axial thrust is small. In addition, the force arm of the pump shaft is long, the vibration is large, and larger motor torque is needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an axial force self-balancing high-pressure centrifugal pump.
The invention is realized by the following technical scheme.
The invention relates to an axial force self-balancing high-pressure centrifugal pump which comprises a double-shaft extension motor, two symmetrical centrifugal pumps and double-inlet double-outlet runners. One end of the double-shaft extension motor is directly connected with the centrifugal pump I, and the other end of the double-shaft extension motor is directly connected with the centrifugal pump II; or one end of the double-shaft extension motor is connected with the centrifugal pump I through a coupler, and meanwhile, the other end of the double-shaft extension motor is connected with the centrifugal pump II through a coupler.
The double-shaft extension motor comprises but is not limited to a common motor, a high-speed motor, a variable frequency motor, a reversible motor, a shielding motor and the like.
Centrifugal pumps of the present invention include, but are not limited to, high pressure centrifugal pumps.
The two symmetrical centrifugal pumps (the centrifugal pump I and the centrifugal pump II) are particularly single-stage pumps or multi-stage pumps without axial force balancing devices. The dual pump heads can be operated in series or in parallel as required by the flow and head ranges.
The double-shaft extension motor is a high-speed motor and forms an axial force self-balancing high-speed centrifugal pump together with two symmetrical centrifugal pumps.
The double-shaft extension motor is a variable frequency motor, and forms a novel chemical pump together with two symmetrical centrifugal pumps, such as an axial force self-balancing high-pressure centrifugal pump and an axial force self-balancing high-pressure supercharging centrifugal pump in seawater desalination.
The double-shaft extension motor is a reversible motor, and can form an axial force self-balancing mixed-flow reversible pump turbine unit together with the reversible pump turbine I and the reversible pump turbine II.
The double-shaft extension motor is a shielding motor and can form an axial force self-balancing high-pressure shielding centrifugal pump together with two symmetrical centrifugal pumps.
The double-shaft extension motor can adopt a common motor or a high-speed motor, and forms other high-speed, low-speed and high-pressure centrifugal pumps with two symmetrical centrifugal pumps.
The invention has the beneficial effects that: the invention provides an axial force self-balancing high-pressure centrifugal pump which comprises a double-shaft extension motor, a symmetrical centrifugal pump connection and a double-inlet double-outlet flow passage. The axial forces of the symmetrical centrifugal pumps are mutually offset, no axial float, no balance water leakage, no seal water leakage and no volume loss caused by the axial force balancing device are generated during operation, and the operation efficiency and the service life of the centrifugal pump are integrally improved. The centrifugal pump has no additional axial force balancing device, the flow channel process is simple, and the manufacturing cost is low. The increased primary material cost of the pump body and the connecting pipeline is negligible compared with the maintenance cost and the service life of the pump body and the connecting pipeline.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a structural schematic diagram of an axial force self-balancing high-pressure centrifugal pump with a double-shaft extension motor and a centrifugal pump connected by a coupler. Wherein, 1 is the biax and stretches motor, 2A is centrifugal pump I, 3A is shaft coupling I, 2B is centrifugal pump II, 3B is shaft coupling II.
Fig. 2 is a structural schematic diagram of an axial force self-balancing high-speed centrifugal pump directly connected with a double-shaft extension motor and the centrifugal pump. 1 is a double-shaft extension motor (high-speed motor), 2A is a centrifugal pump I, 2B is a centrifugal pump II, 2A-1 is an impeller I, 2B-1 is an impeller II, 2A-2 is an inducer I, and 2B-2 is an inducer II.
FIG. 3 is a schematic diagram of an axial force self-balancing high-pressure centrifugal pump and a high-pressure booster centrifugal pump of the present invention applied to seawater desalination.
Fig. 4 is a schematic diagram of an axial force self-balancing horizontal shaft mixed flow reversible pump turbine set. The left and the right of the reversible motor in the middle are respectively connected with a reversible pump turbine.
Fig. 5 is a schematic structural view of an axial force self-balancing high-pressure canned motor pump according to the present invention. Wherein, 1 is a double-shaft extension motor (shielding motor), 2A is a centrifugal pump I, 2A-1 is an impeller I, 2B is a centrifugal pump II, 2B-1 is an impeller II, 15A is a front bearing, 15B is a rear bearing, 17A is a front shaft sleeve, 19 is a rotor, 20 is a stator, 21 is a rotor shielding sleeve, 22 is a stator shielding sleeve, 23A is an auxiliary impeller I, 23B is an auxiliary impeller II, 33A connector I, 33B connector II, 35 is a cooler, 64A is a lining I, 64B is a lining II, and 80 is a filter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
The centrifugal pump I and the centrifugal pump II in the embodiment refer to a single-stage centrifugal pump or a multi-stage centrifugal pump without an axial force balancing device. The dual pump heads can be operated in series or in parallel as required by the flow and head ranges.
Example 1: an axial force self-balancing high-pressure centrifugal pump with a double-shaft extension motor and a centrifugal pump connected through a coupler.
As shown in fig. 1. The one end that the motor 1 was stretched to the biax is connected with centrifugal pump I2A through shaft coupling I3A, and simultaneously, the biax is stretched the motor 1 other end and is passed through II 3B of shaft coupling and be connected with II 2B of centrifugal pump.
In this embodiment, the double-shaft extension motor 1 is a common motor, and the dynamic performance of a shaft system is buffered, damped and improved by the coupler i 3A and the coupler ii 3B at two ends respectively, so as to meet the torque transmission of the axial force self-balancing high-pressure centrifugal pump.
Example 2: an axial force self-balancing high-speed centrifugal pump with a double-shaft extension motor directly connected with a centrifugal pump.
As shown in figure 2, one end of the double-shaft extension motor 1 is directly connected with a centrifugal pump I2A, and the other end of the double-shaft extension motor 1 is directly connected with a centrifugal pump II 2B.
In this embodiment, the axial force self-balancing high-speed centrifugal pump in which two ends of the double-shaft extension motor 1 are directly connected with the centrifugal pump i 2A and the centrifugal pump II 2B respectively, and the impeller i 2A-1 and the impeller II 2B-1 can use a semi-open type impeller and a closed type impeller, so that the efficiency of the high-speed centrifugal pump can be effectively improved. The front ends of the impeller I2A-1 and the impeller II 2B-1 are respectively provided with an inducer I2A-2 and an inducer II 2B-2.
The high-speed centrifugal pump described in this embodiment has two suction ports, and is actually equivalent to two centrifugal pumps connected in parallel. Because the two groups of impellers are equal in number and opposite in direction, the generated water thrust is equal in magnitude and opposite in direction, and the total axial water thrust is zero theoretically. The thrust bearing has light load, long service life and reliable operation, and is an important technical characteristic of a high-speed centrifugal pump.
The cooling mode of the double-shaft extension variable frequency motor 1 in the embodiment can take three forms: forced air cooling, water cooling or oil cooling.
The double pump heads can be operated in series according to the requirements of flow and lift range to form a double-stage, single-suction, cantilever and horizontal high-speed centrifugal pump. The lift generated by a single impeller is half of the actual required lift. Inducer (inducer I2A-2 and inducer II 2B-2) is added at the front end of the impeller of the primary pump head to improve the cavitation resistance, and the inducer does not need to be added on the secondary pump head.
Example 3: the axial force self-balancing high-pressure centrifugal pump and the axial force self-balancing high-pressure supercharging centrifugal pump are applied to seawater desalination.
As shown in fig. 3. In the embodiment, an axial force self-balancing high-pressure centrifugal pump (which is called as a double-shaft extension high-pressure pump for short) is used for replacing a reciprocating displacement pump, a multi-stage high-pressure centrifugal pump or a stainless steel stamping centrifugal pump in the prior art; axial force self-balancing high-pressure booster centrifugal pumps (in the figure, double-shaft booster pumps are abbreviated) are respectively used for replacing the high-pressure booster pumps in the prior art.
Fig. 3 is a schematic diagram of a reverse osmosis (SWRO) seawater desalination process, in which raw seawater to be treated is pressurized by a biaxial stretching high-pressure pump and then enters a reverse osmosis membrane module: the water passing through the reverse osmosis membrane is required fresh water, namely produced water; the residual part of water which does not permeate the membrane is seawater with higher concentration, namely concentrated seawater. The part of concentrated seawater with high pressure energy directly boosts part of raw seawater to be treated through a centrifugal pump-motor energy recovery device, the pressure lost through a membrane stack and a pipeline is compensated through a double-shaft-extension booster pump, and the part of boosted raw seawater is mixed with the boosted raw seawater of the double-shaft-extension high-pressure pump and then is sent to a reverse osmosis membrane assembly.
The high-pressure pumps used in the current reverse osmosis seawater desalination treatment system mainly comprise 3 types: reciprocating positive displacement pumps, multistage high-pressure centrifugal pumps and stainless steel stamping centrifugal pumps.
The reciprocating displacement pump is mainly used for occasions with low rated flow, the flow is normally less than 80m3 h < -1 >, and the reciprocating displacement pump is characterized in that: the efficiency is high, generally more than 85%, and the high efficiency range is big, corresponds certain flow, can reach different lifts, all can guarantee basically to work at the high efficiency point. The reciprocating displacement pump is precise in manufacturing and sensitive to particle impurities, and harmful impurities enter the high-pressure pump, so that the abrasion of the high-pressure pump is aggravated, particularly the abrasion of a transmission mechanism, namely a sliding shoe ball hinge is aggravated, a plunger ball body and a sliding shoe fall off, the high-pressure pump is caused to have faults, and the faults are represented as larger vibration and noise. In order to prevent impurities from entering the interior of the high-pressure pump, it is necessary to start from four points: 1) the filtration efficiency of the pretreatment of seawater is improved, the filtration precision is ensured, and the abnormal abrasion of a friction pair caused by the fact that impurities in the water enter the high-pressure pump is prevented. 2) When the filter element of the microfilter is replaced, impurities cannot be brought into the lower pipeline of the security filter, and the impurities are prevented from entering the high-pressure pump. 3) Unnecessary reverse osmosis membrane chemical cleaning is reduced, and impurities gathered on the surface of the reverse osmosis membrane are prevented from reversely flowing into the high-pressure pump. 4) During chemical cleaning, the external booster centrifugal pump insensitive to impurities is circularly cleaned, so that the precise plunger type booster pump of the device is protected.
Although the reciprocating positive displacement pump has high efficiency, the high-pressure centrifugal pump replaces the reciprocating positive displacement pump in consideration of energy consumption, consumables and maintenance cost of seawater pretreatment, so that the defects of the prior art can be overcome.
The multistage high-pressure centrifugal pump mainly comprises the following types: horizontal split type multistage high-pressure centrifugal pump, sectional type multistage high-pressure centrifugal pump and stainless steel stamping centrifugal pump.
Applicable flow rate of the horizontal middle-open type multistage high-pressure centrifugal pump is more than 220m 3 ·h -1 On the occasion of (3), the larger the flow is, the higher the efficiency of the centrifugal pump is, the efficiency can reach 75% -85%, and the centrifugal pump has the characteristics of small axial thrust, convenient maintenance and high manufacturing cost.
The sectional type multistage high-pressure centrifugal pump is used for medium flow and is 80-220 m 3 ·h -1 . The efficiency is 65% -80%, and the device is characterized by simple structure, small volume, light weight and relatively low price.
The stainless steel stamping centrifugal pump is only used for the occasions with medium and small flow, and the normal flow is<95m 3 ·h -1 It is characterized in that: the efficiency is not high, generally less than 70%, but the volume is small, the weight is light, and the operation and maintenance are convenient.
The invention uses the double-shaft high-pressure centrifugal pump to replace a horizontal middle-open type multistage high-pressure centrifugal pump, a sectional type multistage high-pressure centrifugal pump or a stainless steel stamping centrifugal pump, and can overcome the defects in the prior art. The centrifugal pump-motor energy recovery device also has the self-balancing capability of axial force.
Example 4: an axial force self-balancing horizontal shaft mixed-flow reversible pump turbine set.
As shown in fig. 4, the operation principle of the pumped storage power station is to pump water from a lower reservoir to an upper reservoir for energy storage by using electric power in load valley in a power grid, and a double-shaft horizontal-shaft mixed-flow reversible pump turbine unit is under the working condition of a water pump; when the power grid is in peak load, the discharged water returns to a hydropower station for generating power in a lower reservoir, and the double-shaft horizontal-extending shaft mixed-flow reversible pump turbine unit is in the working condition of the turbine. Also known as energy storage hydropower stations.
The double-shaft horizontal shaft mixed-flow reversible pump turbine unit can solve the problems of large axial water thrust, overhigh temperature of a bearing bush, bush burning, abrasion of a main shaft seal, serious water leakage and the like.
A double-shaft horizontal-shaft mixed-flow reversible pump turbine unit is adopted to establish a medium-sized and small-sized pumped storage power station, and the wind, light, water, fire and storage integration, the wind, light, water and storage integration and the wind, light and storage integration are developed according to local conditions.
Example 5: an axial force self-balancing high-pressure canned motor pump.
Such as the schematic structure of fig. 5.
1. The liquid flows in.
The liquid flow direction of the canned motor pump can be divided into three parts: firstly, the first main flow is a suction inlet of a centrifugal pump I2A → an impeller I2A-1 → a discharge outlet of the centrifugal pump I2A; and the second main flow is a suction inlet of the centrifugal pump II 2B → the impeller II 2B-1 → a discharge outlet of the centrifugal pump II 2B. The circulation fluid flows in the sub-impeller i 23A → the gap between the front bearing 15A and the front boss 17A → the filter 80 → the cooler 35 → the gap between the rear bearing 15B and the rear boss 17B → the sub-impeller ii 23B → the gap between the stator shield 22 and the rotor shield 21.
2. Is characterized in that.
The canned motor pump is composed of a high-temperature chamber formed by a centrifugal pump I2A, a centrifugal pump II 2B) and an impeller I2A-1, an impeller II 2B-1, and a low-temperature chamber formed by a stator 20, a rotor 19 and other parts, wherein the three chambers have the same liquid but different temperatures. Due to the damping effect formed by the connector I33A, the connector II 33B, the bushing I64A and the bushing II 64B, the media on the two sides are hardly mixed into a whole. The inclined small holes in the connector I33A and the connector II 33B transmit high-pressure media generated by the impeller I2A-1 and the impeller II 2B-2 into the motor chamber, so that cavitation of the auxiliary impeller I23A and the auxiliary impeller II 23B is prevented.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. An axial force self-balancing high-pressure centrifugal pump is characterized by comprising a double-shaft extension motor, two symmetrical centrifugal pumps and double-inlet double-outlet runners; one end of the double-shaft extension motor is directly connected with the centrifugal pump I, and the other end of the double-shaft extension motor is directly connected with the centrifugal pump II; or one end of the double-shaft extension motor is connected with the centrifugal pump I through a coupler, and the other end of the double-shaft extension motor is connected with the centrifugal pump II through a coupler;
the centrifugal pump is a single-stage pump or a multi-stage pump without an axial force balancing device; the double pump heads can be connected in series or in parallel according to the requirements of flow and lift ranges.
2. The axial force self-balancing high-pressure centrifugal pump according to claim 1, wherein the biaxial tension motor is a high-speed motor, and forms an axial force self-balancing high-speed centrifugal pump with two symmetrical centrifugal pumps.
3. The axial force self-balancing high-pressure centrifugal pump as claimed in claim 1, wherein the biaxial extension motor is a variable frequency motor, and forms an axial force self-balancing high-pressure centrifugal pump or an axial force self-balancing high-pressure booster centrifugal pump with two symmetrical centrifugal pumps in seawater desalination.
4. The axial force self-balancing high-pressure centrifugal pump as claimed in claim 1, wherein the biaxial extension motor is a reversible motor, and forms an axial force self-balancing mixed-flow reversible pump-turbine unit with the reversible pump-turbine i and the reversible pump-turbine ii.
5. The axial force self-balancing high-pressure centrifugal pump according to claim 1, wherein the double-shaft motor is a shield motor, and forms an axial force self-balancing high-pressure shield centrifugal pump with two symmetrical centrifugal pumps.
CN202210790318.9A 2022-07-06 2022-07-06 Axial force self-balancing high-pressure centrifugal pump Pending CN115095527A (en)

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Application Number Priority Date Filing Date Title
CN202210790318.9A CN115095527A (en) 2022-07-06 2022-07-06 Axial force self-balancing high-pressure centrifugal pump

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Application Number Priority Date Filing Date Title
CN202210790318.9A CN115095527A (en) 2022-07-06 2022-07-06 Axial force self-balancing high-pressure centrifugal pump

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CN115095527A true CN115095527A (en) 2022-09-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115853790A (en) * 2022-12-14 2023-03-28 上海环境卫生工程设计院有限公司 Supercharging device for reverse osmosis filtration
CN116044772A (en) * 2023-04-03 2023-05-02 四川省机械研究设计院(集团)有限公司 Skid-mounted centrifugal pump pumping system and operation control method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115853790A (en) * 2022-12-14 2023-03-28 上海环境卫生工程设计院有限公司 Supercharging device for reverse osmosis filtration
CN115853790B (en) * 2022-12-14 2024-05-17 上海环境卫生工程设计院有限公司 Supercharging device for reverse osmosis filtration
CN116044772A (en) * 2023-04-03 2023-05-02 四川省机械研究设计院(集团)有限公司 Skid-mounted centrifugal pump pumping system and operation control method thereof

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