CN118622718A - A high-efficiency volute pump for multiple working conditions - Google Patents

Abstract

The invention provides a multi-working-condition high-efficiency rotary shell pump which comprises a pump shell, a rotary drum, a bidirectional pitot tube, a power unit and an auxiliary power unit, wherein the pump shell is arranged on the rotary drum; the rotary drum is supported in the pump shell, and the cavity in the rotary drum is communicated with the inlet of the pump shell; the wall surface of the cavity in the rotary drum is provided with an impeller; a bidirectional pitot tube which can rotate relative to the rotary drum is arranged in the cavity inside the rotary drum; the bidirectional pitot tube outlet is communicated with the pump shell outlet; the power unit drives the bidirectional pitot tube to rotate through the main shaft; the main shaft drives the rotary drum to rotate through a gear train; the auxiliary power unit transmits auxiliary power to the rotary drum through the gear train. The invention can carry out corresponding simple adjustment aiming at different torque demands under different working conditions; its hydraulic structure also effectively increases the flow rate of the high-velocity fluid, thereby achieving higher pressure energy and higher efficiency through the bi-directional pitot tube.

Description

A high-efficiency volute pump for multiple working conditions

Technical Field

The invention relates to the field of water pumps, and in particular to a high-efficiency volute pump for multiple working conditions.

Background Art

The volute pump, also known as the rotary jet pump or the pitot tube pump, is a new type of small flow high pressure pump with a unique structure and working principle, and is an extremely low specific speed pump. Ten years ago, my country's rubber industry first introduced two volute pumps from the United States for the transportation of raw oil in the carbon black production line. They are significantly superior to other types of pumps in terms of stable operation and service life.

The volute pump consists of a rotor, a pitot tube, a bearing seat, an outer shell, and inlet and outlet pipes. The bearing seat of the volute pump is the same as that of a common centrifugal pump. The impeller and the drum (equivalent to the pump shell of a centrifugal pump) are connected as a whole and bolted to the long shaft to form the rotor. The outer shell acts as a protective cover on the periphery of the drum and is bolted to the bearing seat. The mechanical seal, the inlet pipe and the outlet pipe are fixed on the right end cover of the outer shell. The core part, the pitot tube, is fixed on the outlet pipe and extends from the axis to the inner wall of the cylinder close to the drum.

The liquid enters the impeller from the inlet pipe, and gains kinetic energy due to the high-speed rotation of the impeller. The liquid enters the periphery of the drum axially from the periphery of the impeller, and the high-speed liquid enters from the inlet of the pitot tube located at the outermost part of the drum. As the cross-section of the pitot tube gradually expands, the liquid flow rate gradually decreases, thereby converting the kinetic energy of the liquid into pressure energy. Finally, the high-pressure liquid is discharged from the outlet pipe. Since the impeller and the drum are connected as one and rotate synchronously, there is no disc friction loss in the process of the liquid gaining kinetic energy. This is the root cause of the much higher efficiency of the volute pump than the high-speed pump and multi-stage centrifugal pump with the same ultra-low specific speed. The flow channel design, dimensional accuracy and finish of the pitot tube are the key factors that determine the efficiency of converting kinetic energy into pressure energy.

At present, the pitot tube of the volute pump is stationary, and the synchronous rotation characteristics of the volute pump cannot be used to the greatest extent, resulting in a limit on the speed of the high-speed fluid flowing into it, and the volute pump cannot obtain a higher head and efficiency. In addition, the volute pump sometimes needs to frequently replace the motor and other equipment when applied to different working conditions, which increases the complexity of the experiment.

Summary of the invention

In view of the deficiencies in the prior art, the present invention provides a high-efficiency volute pump for multiple working conditions, which can be easily adjusted according to different torque requirements under different working conditions; its hydraulic structure also effectively increases the flow rate of high-speed fluids, thereby obtaining higher pressure energy and higher efficiency through a bidirectional Pitot tube.

The present invention achieves the above technical objectives through the following technical means.

A high-efficiency volute pump for multiple working conditions, comprising a pump casing, a drum, a bidirectional pitot tube, a power unit and an auxiliary power unit;

The pump casing supports a rotatable drum, the inner cavity of the drum is connected to the pump casing inlet; an impeller is provided on the inner cavity wall of the drum; a bidirectional pitot tube is installed in the inner cavity of the drum and can rotate relative to the drum; the outlet of the bidirectional pitot tube is connected to the pump casing outlet;

The power unit drives the bidirectional pitot tube to rotate through the main shaft; the main shaft drives the drum to rotate through the gear train; and the auxiliary power unit transmits the auxiliary power to the drum through the gear train.

Furthermore, the gear train includes a first external gear, a second external gear and a third external gear; the first external gear is mounted on the main shaft; the second external gear and the third external gear are coaxially mounted on the auxiliary transmission shaft, and the first external gear is meshed with the second external gear; a gear ring is provided on the outer side of the drum, and the gear ring is meshed with the third external gear; the auxiliary power unit is connected to the auxiliary transmission shaft for providing auxiliary power.

Furthermore, the rotation direction of the bidirectional pitot tube is opposite to the rotation direction of the drum.

Furthermore, the first external gear and the second external gear are located in a housing, and the housing is connected to a pump casing; the auxiliary transmission shaft is supported on the housing.

Furthermore, the auxiliary power unit is connected to the auxiliary transmission shaft via an overrunning clutch; the overrunning clutch is selectively controlled to engage, so as to control the auxiliary power unit to supplement power.

Furthermore, in the gear train, three auxiliary transmission shafts are evenly distributed outside the main shaft, and the second external gears on the three auxiliary transmission shafts are respectively meshed with the first external gear; and each auxiliary transmission shaft is installed with an auxiliary power unit.

Furthermore, it also includes a control system and a sensor, wherein the sensor is used to detect the actual torque of the main shaft; the control system selectively controls the on and off of the overrunning clutch according to the detected actual torque of the main shaft.

Further, when the sensor detects that the actual torque of the main shaft is ≤55% of the design torque, the control system controls the overrunning clutch to be disconnected, and the power unit drives the drum and the bidirectional pitot tube to rotate through the gear train;

When 55% of the design torque < the actual torque of the main shaft detected by the sensor ≤ 70% of the design torque, the control system only controls one overrunning clutch to engage, and the power unit drives the drum and the two-way pitot tube to rotate through the gear train, and an auxiliary power unit supplements power to the gear train;

When 70% of the design torque < the actual torque of the main shaft detected by the sensor ≤ 85% of the design torque, the control system only controls the two overrunning clutches to engage, and the power unit drives the drum and the two-way pitot tube to rotate through the gear train, and the two auxiliary power units respectively supplement power to the gear train;

When 85% of the design torque < the actual torque of the main shaft detected by the sensor, the control system controls the three overrunning clutches to engage, and the power unit drives the drum and the two-way pitot tube to rotate through the gear train, and the three auxiliary power units supplement power to the gear train respectively.

The beneficial effects of the present invention are:

1. The multi-operating-mode high-efficiency volute pump of the present invention makes the rotation direction of the bidirectional pitot tube opposite to that of the drum through a gear train, which greatly increases the flow rate of the high-speed fluid flowing into the pitot tube, thereby effectively increasing the head and improving the efficiency.

2. The multi-operating-mode high-efficiency volute pump of the present invention drives the bidirectional pitot tube to rotate through the main shaft. When the fluid flows in from the end of the bidirectional pitot tube, the structural characteristic of the gradually increasing cross-sectional area of the pitot tube can be used to convert the kinetic energy of the high-energy fluid into pressure energy and finally pump it out through the outlet pipe. In addition, the auxiliary transmission shaft drives the drum to rotate in the opposite direction, thereby increasing the kinetic energy of the fluid and improving the head. Because the fluid rotates together, the friction loss of the disc caused by the friction between the impeller and the fluid is eliminated, thereby improving the efficiency of the volute pump.

3. The high-efficiency volute pump for multiple working conditions described in the present invention increases power through three auxiliary motors. According to the detected actual torque of the main shaft, 1 to 3 auxiliary motors are selectively controlled to change the output torque to change the output power of the drum and the Pitot tube, thereby obtaining the desired torque configuration according to the actual working conditions. It is more flexible in setting than a general volute pump, and has higher variability and better applicability.

4. Compared with common volute pumps, the multi-operating-condition high-efficiency volute pump of the present invention has a clear structure and is convenient for later repair and maintenance. It adopts a bidirectional pitot tube to rotate together with the drum, thus simplifying the structure.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of the structure of a high-efficiency volute pump for multiple working conditions according to the present invention.

FIG. 2 is a transmission principle diagram of the high-efficiency volute pump for multiple working conditions according to the present invention.

In the figure:

1-drum; 2-first motor; 3-housing; 4-water inlet; 5-water outlet; 6-main shaft; 7-bidirectional pitot tube; 8-pump casing; 9-impeller; 10-second motor; 11-overrunning clutch; 12-first external gear; 13-second external gear; 14-third external gear; 15-gear ring; 16-auxiliary transmission shaft.

DETAILED DESCRIPTION

Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

As shown in FIG1 , the multi-operating-mode high-efficiency volute pump of the present invention comprises a pump casing 8, a drum 1, a bidirectional pitot tube 7, a first motor 2 and a second motor 10; the pump casing 8 is provided with a water inlet 4 and a water outlet 5, the pump casing 8 supports a rotatable drum 1, and the inner cavity of the drum 1 is connected to the water inlet 4 of the pump casing 8; a plurality of impellers 9 are evenly distributed on the inner cavity wall of the drum 1, a bidirectional pitot tube 7 rotatable relative to the drum 1 is installed in the inner cavity of the drum 1, the outlet of the bidirectional pitot tube 7 is connected to the outlet of the pump casing 8, the impeller 9 rotates to collect water flow to the upper and lower ends of the drum 1, and by allowing high-energy water flow to flow through the bidirectional pitot tube 7, the kinetic energy of the water flow can be converted into pressure energy, thereby greatly increasing the head of the volute pump, and the final efficiency is also improved. The first motor 2 drives the bidirectional pitot tube 7 to rotate through the main shaft 6; the main shaft 6 drives the drum 1 to rotate through the gear train; the second motor 10 transmits auxiliary power to the drum 1 through the gear train. The rotation direction of the bidirectional pitot tube 7 is opposite to that of the drum 1. The bidirectional pitot tube 7 is driven to rotate by the main shaft 6. When the fluid flows in from the end of the bidirectional pitot tube 7, the kinetic energy of the high-energy fluid can be converted into pressure energy and finally pumped out through the outlet pipe by utilizing the structural characteristics of the gradually increasing cross-sectional area of the bidirectional pitot tube 7. In addition, the gear train drives the drum 1 and the bidirectional pitot tube 7 to rotate in the opposite direction, thereby increasing the kinetic energy of the fluid and improving the head. Because the fluid rotates together, the disc friction loss caused by the friction between the impeller 9 and the fluid is eliminated, thereby improving the efficiency of the volute pump.

The first motor 2 is connected to the main shaft 6 through a coupling. The main shaft 6 is supported on the housing 3. One end of the main shaft 6 passes through the housing 3 and is connected to the bidirectional Pitot tube 7. One end of the drum 1 is supported on the main shaft 6, and the other end of the drum 1 is supported on the pump housing 8.

As shown in FIG2 , the gear train includes a first external gear 12, a second external gear 13 and a third external gear 14; the first external gear 12 is mounted on the main shaft 6; the second external gear 13 and the third external gear 14 are coaxially mounted on the auxiliary transmission shaft 16, and the first external gear 12 is meshed with the second external gear 13; the first external gear 12 and the second external gear 13 are located in the housing 3, and the housing 3 is connected to the pump housing; the auxiliary transmission shaft 16 is supported on the housing 3. A gear ring 15 is provided at one end of the drum 1, and the gear ring 15 is meshed with the third external gear 14; the auxiliary power unit is connected to the auxiliary transmission shaft 16 to provide auxiliary power.

The auxiliary power unit is connected to the auxiliary transmission shaft 16 via an overrunning clutch 11; the overrunning clutch 11 is selectively controlled to engage, so as to control the auxiliary power unit to supplement power.

The working principle is:

When the volute pump is working, the pumping system for conveying clean water continuously injects clean water of a certain pressure into the water inlet 4, and the two-way pitot tube 7 and the drum 1 are connected to the gear train. The opening and closing of the corresponding motor is adjusted according to the torque required for the actual working condition to provide the two-way pitot tube and the drum with appropriate power and make them start to rotate in the opposite direction, thereby increasing the kinetic energy of the clean water. The clean water is then collected to the upper and lower ends of the drum through the impellers symmetrically distributed above and below. Then the clean water flows in from the inlet of the two-way pitot tube located at the outermost part of the drum, and then passes through the gradually increasing cross-section of the two-way pitot tube, thereby converting the kinetic energy of the clean water into pressure energy, and finally pumped out through the outlet pipe connected to the end of the two-way pitot tube. The present invention can make the volute pump reversibly applicable to different torque requirements under different working conditions through simple adjustment, increase the practicality of the water pump, effectively improve the performance of the water pump, and improve the efficiency of the volute pump.

In the gear train of the embodiment, three auxiliary transmission shafts 16 are evenly distributed outside the main shaft 6, and the second external gears 13 on the three auxiliary transmission shafts 16 are respectively meshed with the first external gear 12; an auxiliary power unit is installed on each auxiliary transmission shaft 16. The embodiment also includes a control system and a sensor, the sensor is used to detect the actual torque of the main shaft 6; the control system selectively controls the on and off of the overrunning clutch 11 according to the detected actual torque of the main shaft 6.

When the sensor detects that the actual torque of the main shaft 6 is ≤55% of the design torque, the control system controls the overrunning clutch 11 to be disconnected, and the first motor 2 drives the short shaft 16 and the long shaft 6 to rotate in the opposite direction through the gear train, thereby realizing the reverse rotation of the bidirectional pitot tube 7 and the drum 1;

When 55% of the design torque < the actual torque of the main shaft 6 detected by the sensor ≤ 70% of the design torque, the control system controls only one overrunning clutch 11 to engage, and the first motor 2 drives the drum 1 and the two-way pitot tube 7 to rotate through the gear train, and the first motor 2 drives the short shaft 16 and the long shaft 6 to rotate in the opposite direction through the gear train, thereby realizing the two-way pitot tube 7 and the drum 1 to rotate in the opposite direction, and a second motor 10 supplements power to the gear train;

When 70% of the design torque < the actual torque of the main shaft 6 detected by the sensor ≤ 85% of the design torque, the control system only controls the two overrunning clutches 11 to engage, and the first motor 2 drives the drum 1 and the two-way pitot tube 7 to rotate through the gear train, and the two second motors 10 supplement power to the gear train;

When 85% of the design torque is less than the actual torque of the main shaft 6 detected by the sensor, the control system controls the three overrunning clutches 11 to engage, and the first motor 2 drives the drum 1 and the two-way pitot tube 7 to rotate through the gear train, and the three second motors 10 supplement power to the gear train;

When it is necessary to switch to low-torque operation again, it is only necessary to turn off the second motor 10 in sequence and adjust the corresponding overrunning clutch 11 to the disengaged state according to the specific torque required for the actual working condition. Therefore, when it is necessary to change the torque configuration or save energy according to different working conditions, it is convenient to control the torque output to the above-mentioned shafts by turning on and off the first motor 2 and the second motor 10 and cooperating with the overrunning clutch 11 to obtain the torque ratio and performance requirements that meet the actual working condition requirements. In this way, the multi-working condition high-efficiency volute pump can be more flexibly applied to working scenes under different working conditions, enhancing its practicality.

It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims (8)

1. The efficient rotary shell pump for multiple working conditions is characterized by comprising a pump shell (8), a rotary drum (1), a bidirectional pitot tube (7), a power unit and an auxiliary power unit;

The rotatable rotary drum (1) is supported in the pump shell (8), and the inner cavity of the rotary drum (1) is communicated with the inlet of the pump shell (8); an impeller (9) is arranged on the wall surface of the inner cavity of the rotary drum (1); a bidirectional pitot tube (7) which can rotate relative to the rotary drum (1) is arranged in the cavity inside the rotary drum (1); the outlet of the bidirectional pitot tube (7) is communicated with the outlet of the pump shell (8);

The power unit drives the bidirectional pitot tube (7) to rotate through the main shaft (6); the main shaft (6) drives the rotary drum (1) to rotate through a gear train; the auxiliary power unit transmits auxiliary power to the rotary drum (1) through a gear train.

2. The multiple working efficient rotary case pump according to claim 1, wherein the train wheel includes a first external gear (12), a second external gear (13) and a third external gear (14); the first external gear (12) is arranged on the main shaft (6); the second external gear (13) and the third external gear (14) are coaxially arranged on an auxiliary transmission shaft (16), and the first external gear (12) is meshed with the second external gear (13); a gear ring (15) is arranged on the outer side of the rotary drum (1), and the gear ring (15) is meshed with a third external gear (14); the auxiliary power unit is connected with an auxiliary transmission shaft (16) and is used for providing auxiliary power.

3. A multiple working efficient rotary-shell pump according to claim 2, characterized in that the direction of rotation of the bi-directional pitot tube (7) is opposite to the direction of rotation of the drum (1).

4. The multiple working efficient rotary case pump according to claim 2, wherein the first external gear (12) and the second external gear (13) are located in a housing (3), and the housing (3) is connected to a pump case; the auxiliary transmission shaft (16) is supported on the housing (3).

5. The multi-operating high-efficiency rotary shell pump according to claim 2, wherein the auxiliary power unit is connected with an auxiliary transmission shaft (16) through an overrunning clutch (11); the auxiliary power unit is controlled to supplement power by selectively controlling the engagement of the overrunning clutch (11).

6. The multi-working-condition high-efficiency rotary shell pump according to claim 2, wherein in the gear train, 3 auxiliary transmission shafts (16) are uniformly distributed on the outer side of the main shaft (6), and second external gears (13) on the 3 auxiliary transmission shafts (16) are respectively meshed with the first external gears (12); each auxiliary drive shaft (16) is provided with an auxiliary power unit.

7. The multiple duty high efficiency rotary shell pump of claim 6, further comprising a control system and a sensor for detecting actual torque of the main shaft (6); the control system selectively controls the on-off of the overrunning clutch (11) according to the detected actual torque of the main shaft (6).

8. The multi-working-condition high-efficiency rotary shell pump according to claim 7 is characterized in that when the sensor detects that the actual torque of the main shaft (6) is less than or equal to 55% of the design torque, the control system controls the overrunning clutch (11) to be disconnected, and the power unit drives the rotary drum (1) and the bidirectional pitot tube (7) to rotate through the gear train;

When the design torque of 55% is less than or equal to 70% of the actual torque of the main shaft (6) detected by the sensor, the control system only controls one overrunning clutch (11) to be engaged, the power unit drives the rotary drum (1) and the bidirectional pitot tube (7) to rotate through the gear train, and one auxiliary power unit supplements power to the gear train;

when 70% of design torque is less than or equal to 85% of design torque of the actual torque of the main shaft (6) detected by a sensor, the control system only controls the engagement of the two overrunning clutches (11), the power unit drives the rotary drum (1) and the bidirectional pitot tube (7) to rotate through the gear train, and the two auxiliary power units respectively supplement power to the gear train;

when 85% of design torque is smaller than the actual torque of the main shaft (6) detected by the sensor, the control system controls the three overrunning clutches (11) to be engaged, the power unit drives the rotary drum (1) and the bidirectional pitot tube (7) to rotate through the gear train, and the three auxiliary power units respectively supplement power to the gear train.