Extra-large-flow supercharging type shield pump and using method

Abstract

The invention discloses an extra-large-flow supercharging type shield pump and a using method, and relates to the technical field of supercharging shield pumps. The shield pump comprises a shield pump body, the outlet end of the shield pump body is fixedly connected with a first circulating pipe, the peripheral side face of the shield pump body is fixedly connected with a shell-and-tube heat exchanger through a supporting frame, the other end of the shell-and-tube heat exchanger communicates with the interior of the shield pump body through a vertical pipe, and a motor cavity is formed in the shield pump body; a second circulating pipe is fixedly connected to the circumferential side face of the shield pump body, one end of the second circulating pipe communicates with the motor cavity, the other end of the second circulating pipe communicates with the outlet end of the shield pump body, and one-way valves are fixedly installed on the circumferential side faces of the first circulating pipe and the second circulating pipe correspondingly. Circulating liquid at the outlet end of the pump body of the shield pump is cooled under the action of the shell-and-tube heat exchanger and flows to the motor cavity to absorb heat generated by operation of the motor in the motor cavity, and meanwhile the situation that the circulating liquid absorbs heat and is vaporized, and operation of the motor is affected is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field related to booster shielded pumps, and in particular relates to an extra-large flow booster shielded pump and a use method thereof. Background Art

[0002] A canned motor pump is a pump driven by a canned motor in which the stator winding and rotor winding are respectively placed in a sealed metal cylinder. Since the rotating shaft sealing device of the traditional pump is eliminated, the canned motor pump can achieve complete leakage-free operation. It is particularly suitable for conveying precious, toxic, harmful, flammable, explosive or radioactive liquids. It has higher safety when handling hazardous media and reduces the risk of environmental pollution and casualties caused by leakage.

[0003] At present, canned motor pumps are all self-balancing with impellers and sealing rings. The axial force capacity of the balance is small and cannot meet the axial force generated by the large flow pump, which shortens the service life of the bearings. At the same time, during the medium delivery process, the medium plays a role in lubricating the bearings and taking away part of the heat of the motor. When delivering easily vaporized media, the medium absorbs the heat generated by the motor operation, which will cause it to vaporize in the motor cavity and affect the operation of the motor. To this end, we provide a large flow booster canned motor pump and its use method to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a large flow booster canned pump, which solves the above-mentioned technical background problems through the specific structural design of the canned pump body, the first circulation pipe, the shell and tube heat exchanger and the second circulation pipe.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention discloses a super-large flow booster canned pump and a method for using the same, comprising a canned pump body, wherein the outlet end of the canned pump body is fixedly connected to a first circulation pipe, the first circulation pipe is communicated with the outlet end of the canned pump body, a shell-and-tube heat exchanger is fixedly connected to the peripheral side surface of the canned pump body through a support frame, one end of the shell-and-tube heat exchanger is communicated with the first circulation pipe, and the other end of the shell-and-tube heat exchanger is communicated with the interior of the canned pump body through a vertical riser; a motor cavity is provided inside the canned pump body, and an auxiliary impeller is rotatably arranged inside the canned pump body; a second circulation pipe is fixedly connected to the peripheral side surface of the canned pump body, one end of the second circulation pipe is communicated with the motor cavity, and the other end of the second circulation pipe is communicated with the outlet end of the canned pump body, and one-way valves are fixedly installed on the peripheral sides of the first circulation pipe and the second circulation pipe.

[0007] The present invention is further configured such that a front bearing seat is fixedly installed inside the shielded pump body, and a plurality of first through-holes are opened on the surface of the front bearing seat, a rear bearing seat is fixedly installed inside the motor cavity, and a plurality of second through-holes are opened on the surface of the rear bearing seat, and a drive shaft is rotatably connected between the front bearing seat and the rear bearing seat.

[0008] The present invention is further configured as follows: a rotor assembly is fixedly installed on the circumferential side of the drive shaft, a rotor shielding sleeve is fixedly connected to the circumferential side of the rotor assembly, a stator assembly is fixedly installed on the inner wall of the shielded pump body, and a stator shielding sleeve is fixedly connected to the circumferential side of the stator assembly; a gap cavity is formed between the rotor shielding sleeve and the stator shielding sleeve, and the gap cavity is located between the front bearing seat and the rear bearing seat; a pump body shaft is rotatably arranged inside the shielded pump body, the auxiliary impeller is fixedly connected to the circumferential side of the pump body shaft, a balancing disk is fixedly connected to one side of the auxiliary impeller, and the pump body shaft is fixedly connected to the drive shaft.

[0009] The present invention is further configured as follows: a bidirectional automatic balancing structure is installed inside the shielded pump body, the bidirectional automatic balancing structure is in contact with the side surface of the pump body shaft, and a first balancing chamber is formed between one side of the bidirectional automatic balancing structure and the shielded pump body; a conical variable pitch inducer is fixedly connected to one end of the pump body shaft, an adjusting disk is fixedly connected to the side surface of the pump body shaft, an adjustment gap is formed between the adjusting disk and the bidirectional automatic balancing structure, and a second balancing chamber is formed between the adjusting disk and the shielded pump body.

[0010] The present invention has the following beneficial effects:

[0011] 1. The present invention provides a shell-and-tube heat exchanger and an auxiliary impeller for pressurization. After the circulating fluid is cooled once by the shell-and-tube heat exchanger, the circulating fluid flows to the auxiliary impeller. After the auxiliary impeller internally pressurizes the motor circulating fluid, the cooled and pressurized circulating fluid is used to absorb the heat generated by the motor operation inside the motor cavity, thereby avoiding the vaporization problem caused by the motor circulating fluid absorbing the motor heat and achieving safe and reliable operation of the motor.

[0012] 2. The present invention sets up a bidirectional automatic balancing structure and a conical variable pitch inducer hydraulic power. Since the pressure difference between the pressure in the first balancing chamber and the pressure in the second balancing chamber remains basically unchanged before and after balancing, when the axial force on the rotor assembly is greater than the balancing force on the balancing disk, the pressure in the regulating gap increases, so that the balancing force increases until the balancing force increases to the same magnitude as the axial force, and a balanced state is reached, thereby solving the operating reliability and cavitation problems of the ultra-large flow pump and achieving an operating condition of ultra-large flow, small head and low cavitation.

[0013] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0015] Figure 1 This is a longitudinal structural cross-sectional view of an extra-large flow booster type shielded pump.

[0016] Figure 2 It is a partial structural schematic diagram of the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0018] 1-shielded pump body, 2-first circulation pipe, 3-tube heat exchanger, 4-second circulation pipe, 5-front bearing seat, 6-rear bearing seat, 7-rotor assembly, 8-stator assembly, 9-auxiliary impeller, 10-conical variable pitch inducer. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] For specific embodiment 1, please refer to Figure 1-2 The present invention is a super large flow booster canned pump, comprising a canned pump body 1. Specifically, the outlet end of the canned pump body 1 is fixedly connected with a first circulation pipe 2, the first circulation pipe 2 is connected with the outlet end of the canned pump body 1, and a shell-and-tube heat exchanger 3 is fixedly connected to the side surface of the canned pump body 1 through a support frame. The liquid absorbs heat through the shell-and-tube heat exchanger 3, so that the temperature of the liquid decreases. One end of the shell-and-tube heat exchanger 3 is connected with the first circulation pipe 2, and the other end of the shell-and-tube heat exchanger 3 is connected with the inside of the canned pump body 1 through a vertical riser; the canned pump body 1 is provided with a There is a motor cavity, and a secondary impeller 9 is rotatably arranged inside the shielded pump body 1. A second circulation pipe 4 is fixedly connected to the side surface of the shielded pump body 1. One end of the second circulation pipe 4 is connected to the motor cavity, and the other end of the second circulation pipe 4 is connected to the outlet end of the shielded pump body 1. A one-way valve is fixedly installed on the sides of the first circulation pipe 2 and the second circulation pipe 4. By controlling the opening and closing of the one-way valve, the liquid at the outlet end of the shielded pump body 1 is controlled to flow to the first circulation pipe 2, and the liquid that absorbs the heat inside the motor cavity is discharged back to the outlet end of the shielded pump body 1 through the second circulation pipe 4.

[0021] Furthermore, a front bearing seat 5 is fixedly installed inside the shielded pump body 1, and a plurality of first through-holes are opened on the surface of the front bearing seat 5; a rear bearing seat 6 is fixedly installed inside the motor cavity, and a plurality of second through-holes are opened on the surface of the rear bearing seat 6; a driving shaft is rotatably connected between the front bearing seat 5 and the rear bearing seat 6; a driving device is fixedly installed inside the motor cavity, and the driving device and the driving shaft are fixedly connected.

[0022] Furthermore, a rotor assembly 7 is fixedly installed on the circumferential side of the driving shaft, a rotor shielding sleeve is fixedly connected to the circumferential side of the rotor assembly 7, a stator assembly 8 is fixedly installed on the inner wall of the shielded pump body 1, and a stator shielding sleeve is fixedly connected to the circumferential side of the stator assembly 8; a gap cavity is formed between the rotor shielding sleeve and the stator shielding sleeve, and the rotor shielding sleeve and the stator shielding sleeve are used to prevent liquid from contacting electronic devices, and the gap cavity is located between the front bearing seat 5 and the rear bearing seat 6; a pump body shaft is rotatably arranged inside the shielded pump body 1, an auxiliary impeller 9 is fixedly connected to the circumferential side of the pump body shaft, a balancing plate is fixedly connected to one side of the auxiliary impeller 9, and the pump body shaft and the driving shaft are fixedly connected.

[0023] The operation process of this embodiment is as follows: when it is necessary to absorb the heat inside the motor cavity, the one-way valves on the first circulation pipe 2 and the second circulation pipe 4 are opened at the same time, so that part of the liquid at the outlet end of the shielded pump body 1 enters the first circulation pipe 2 in the form of circulating liquid, and the circulating liquid flows along the first circulation pipe 2 to the shell-and-tube heat exchanger 3. Under the action of the shell-and-tube heat exchanger 3, the circulating liquid is cooled down for water cooling, and the cooled circulating liquid flows into the shielded pump body 1. By controlling the rotation of the auxiliary impeller 9, the circulating liquid flowing into the shielded pump body 1 is cooled at the auxiliary impeller 9. Under the action of rotation, pressurization is achieved, and the pressurized circulating fluid flows into the gap cavity through the first through-port, and then flows into the motor cavity through the second through-port. The circulating fluid after cooling and pressurization absorbs the heat generated by the motor operation in the motor cavity. At the same time, the circulating fluid is cooled by the shell and tube heat exchanger 3 and pressurized by the auxiliary impeller 9 to avoid vaporization when absorbing heat. After absorbing the heat, the circulating fluid flows to the second circulation pipe 4, and flows back to the outlet end of the shielded pump body 1 through the second circulation pipe 4, and is discharged outward with the liquid at the outlet end of the shielded pump body 1.

[0024] For specific embodiment 2, please refer to Figure 1-2 On the basis of the specific embodiment 1, specifically, a two-way automatic balancing structure is installed inside the shielded pump body 1, and the two-way automatic balancing structure is in contact with the side surface of the pump body shaft, and there is a certain gap between the two-way automatic balancing structure and the pump body shaft (such as Figure 2 The part shown by b1 in the middle facilitates the adjustment of the pressure on both sides of the bidirectional automatic balancing structure, and a first balancing chamber is formed between one side of the bidirectional automatic balancing structure and the shielded pump body 1.

[0025] Furthermore, a conical variable pitch inducer 10 is fixedly connected to one end of the pump shaft, and an adjustment disk is fixedly connected to the side of the pump shaft, and an adjustment gap is formed between the adjustment disk and the two-way automatic balancing structure (the adjustment gap is as follows Figure 2 A second balancing chamber is formed between the adjusting disk and the shielded pump body 1 (shown as part b2 in the figure).

[0026] The operation process of this embodiment is as follows: during the operation of the shielded pump body 1, since the pressure difference between the pressure P3 in the first balancing chamber and the pressure P5 in the second balancing chamber before and after balancing remains basically unchanged, when the shielded pump body 1 is running, if the axial force A generated by the rotation of the rotor assembly 7 and the conical variable pitch inducer 10 is greater than the balancing force F on the balancing disk, the rotor assembly 7 moves to the left, the adjustment gap b2 decreases, and the resistance inside the corresponding adjustment gap increases. At the same time, the leakage of the two-way automatic balancing structure decreases, thereby increasing the pressure P4 in the adjustment gap and the balancing force F increases synchronously until the balancing force F increases to the same size as the axial force A, and a balanced state is reached; similarly, if the axial force A is less than the balancing force F, the rotor assembly 7 moves to the right, and balance can also be achieved. Finally, the rotor assembly 7, the auxiliary impeller 9 and other rotatable parts inside the shielded pump body 1 tend to be suspended during the operation of the shielded pump body 1.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0028] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A super large flow booster canned motor pump, comprising a canned motor pump body (1), characterized in that: The outlet end of the canned pump body (1) is fixedly connected to a first circulation pipe (2), the first circulation pipe (2) is connected to the outlet end of the canned pump body (1), the peripheral side of the canned pump body (1) is fixedly connected to a shell-and-tube heat exchanger (3) via a support frame, one end of the shell-and-tube heat exchanger (3) is connected to the first circulation pipe (2), and the other end of the shell-and-tube heat exchanger (3) is connected to the inside of the canned pump body (1) via a vertical riser; A motor cavity is provided inside the canned pump body (1), and an auxiliary impeller (9) is rotatably arranged inside the canned pump body (1). A second circulation pipe (4) is fixedly connected to the peripheral side surface of the canned pump body (1), one end of the second circulation pipe (4) is connected to the motor cavity, and the other end of the second circulation pipe (4) is connected to the outlet end of the canned pump body (1), and one-way valves are fixedly installed on the peripheral side surfaces of the first circulation pipe (2) and the second circulation pipe (4).

2. The large flow booster canned motor pump according to claim 1, characterized in that: A front bearing seat (5) is fixedly installed inside the shielded pump body (1), and a plurality of first through-holes are provided on the surface of the front bearing seat (5); a rear bearing seat (6) is fixedly installed inside the motor cavity, and a plurality of second through-holes are provided on the surface of the rear bearing seat (6); and a driving shaft is rotatably connected between the front bearing seat (5) and the rear bearing seat (6).

3. The large flow booster canned motor pump according to claim 2, characterized in that: A rotor assembly (7) is fixedly mounted on the peripheral side of the drive shaft, and a rotor shielding sleeve is fixedly connected to the peripheral side of the rotor assembly (7); a stator assembly (8) is fixedly mounted on the inner wall of the shielded pump body (1), and a stator shielding sleeve is fixedly connected to the peripheral side of the stator assembly (8).

4. The large flow booster canned motor pump according to claim 3, characterized in that: A gap cavity is formed between the rotor shielding sleeve and the stator shielding sleeve, and the gap cavity is located between the front bearing seat (5) and the rear bearing seat (6).

5. The large flow booster canned motor pump according to claim 4, characterized in that: A pump shaft is rotatably arranged inside the shielded pump body (1), the auxiliary impeller (9) is fixedly connected to the side surface of the pump shaft, a balancing disk is fixedly connected to one side of the auxiliary impeller (9), and the pump shaft is fixedly connected to the drive shaft.

6. The large flow booster canned motor pump according to claim 5, characterized in that: A bidirectional automatic balancing structure is installed inside the shielded pump body (1), the bidirectional automatic balancing structure is fitted to the side surface of the pump body shaft, and a first balancing chamber is formed between one side surface of the bidirectional automatic balancing structure and the shielded pump body (1).

7. The large flow booster canned motor pump according to claim 6, characterized in that: A conical variable pitch inducer (10) is fixedly connected to one end of the pump shaft, an adjustment disk is fixedly connected to the side surface of the pump shaft, an adjustment gap is formed between the adjustment disk and the bidirectional automatic balancing structure, and a second balancing chamber is formed between the adjustment disk and the shielded pump body (1).

8. The method for using a super-large flow booster canned motor pump according to claim 7, characterized in that: The steps include: S01, when the canned pump body (1) is started, the liquid flows out through the outlet end of the canned pump body (1), a part of the circulating liquid at the outlet end of the canned pump body (1) enters the interior of the first circulation pipe (2), and flows to the shell-and-tube heat exchanger (3), and the circulating liquid flows into the interior of the canned pump body (1) after being radially water-cooled by the shell-and-tube heat exchanger (3); S02, controlling the rotation of the auxiliary impeller (9) to pressurize the circulating fluid flowing into the inner part of the shielded pump body (1), so that the pressurized circulating fluid flows into the gap cavity through the first through-hole, and then flows into the inner part of the motor cavity through the second through-hole; S03, when the pressurized circulating fluid flows into the motor cavity, the circulating fluid absorbs the heat generated by the operation of the motor in the motor cavity. Since the circulating fluid is cooled by the tube-in-tube heat exchanger (3) and pressurized by the auxiliary impeller (9), the circulating fluid is prevented from vaporizing. The circulating fluid that has absorbed the heat flows to the second circulation pipe (4) and flows back to the outlet end of the canned pump body (1) through the second circulation pipe (4); S04. During the operation of the shielded pump body (1), the pressure difference between the pressure P3 in the first balancing chamber and the pressure P5 in the second balancing chamber remains substantially unchanged before and after balancing. When the axial force A on the rotor assembly (7) is greater than the balancing force F on the balancing disk, the rotor assembly (7) moves to the left, and the adjustment gap b2 decreases, corresponding to an increase in the resistance inside the adjustment gap. At the same time, the leakage of the bidirectional automatic balancing structure decreases. S05, the pressure P4 in the adjustment gap is increased, so that the balancing force F increases, until the balancing force F increases to the same magnitude as the axial force A, and a balanced state is reached; S06. When the axial force A is smaller than the balancing force F, the rotor assembly (7) moves to the right and can also achieve balance, and finally the rotor assembly (7), the auxiliary impeller (9) and other rotatable parts inside the shielded pump body (1) tend to be in a suspended state during the operation of the shielded pump body (1).

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