Slurry type shielding electric pump for conveying media easy to crystallize

Abstract

The invention discloses a slurry type shielding electric pump for conveying a medium easy to crystallize, and relates to the technical field of slurry type shielding electric pumps. A driving shaft is rotationally arranged in the shield pump body through a bearing seat, a connecting body is fixedly connected to the end, close to a liquid inlet, of the driving shaft, an open impeller is fixedly connected to one side face of the connecting body, the open impeller is composed of a plurality of blades and blade reinforcing ribs, and a thrust disc is fixedly connected to the end, away from the open impeller, of the driving shaft. Two thrust bearings are symmetrically arranged on the circumferential side face of the driving shaft and fixedly installed in the shield pump body, and the thrust disc is located between the two thrust bearings. Axial force is generated through rotation of the open impeller, the gap between the thrust bearing and the thrust disc is changed under the action of the axial force, the gap between the open impeller and the shield pump body is ensured, the situation that transmission efficiency is affected by medium leakage is avoided, meanwhile, the open impeller is convenient to clean, and the situation that starting and stopping of the shield pump body are affected by medium attachment is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of slurry type canned electric pumps, and in particular relates to a slurry type canned electric pump for conveying a medium that is easy to crystallize. Background Art

[0002] Mud-type canned motor pump is a widely used equipment in industrial production, mainly used to transport high-concentration mud or liquid containing particulate matter. Mud-type canned motor pump uses the combined effect of centrifugal force and shielding shell. When the pump is started, the impeller starts to rotate. Due to the centrifugal force, the mud is sucked into the pump body. Inside the pump body, the mud is filtered by the shielding shell, the particulate matter is blocked outside, and the clean liquid is quickly sent out by the impeller. At the same time, the guide plate and flow channel inside the pump body guide the direction of the mud flow, improving the working efficiency of the pump.

[0003] Existing canned motor pumps generally use closed impellers or semi-open impellers, and use sealing rings and balance holes or back blades to adjust the axial force. When transporting easy-to-crystallize media, the closed impeller is not easy to clean and is not convenient for frequent pump start and stop. The axial force of the semi-open impeller is difficult and unstable to adjust, the service life of the wearing parts is not high, and the operating conditions are also very demanding, which is not convenient for production and processing. To this end, we provide a slurry canned motor pump for transporting easy-to-crystallize media to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a slurry-type canned electric pump for conveying easily crystallized media, which solves the problems in the above technical background through the specific structural design of the canned pump body, open impeller and thrust bearing.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a slurry-type canned electric pump for conveying easily crystallized media, comprising a canned pump body, wherein a drive shaft is rotatably arranged inside the canned pump body through a bearing seat, an end of the drive shaft close to a liquid inlet is fixedly connected to a connector, and an open impeller is fixedly connected to one side of the connector, wherein the open impeller is composed of a plurality of blades and blade reinforcement ribs; an end of the drive shaft far from the impeller is fixedly connected to a thrust plate, and two thrust bearings are symmetrically arranged on the circumferential side of the drive shaft, the thrust bearings are fixedly installed inside the canned pump body, and the thrust plate is located between the two thrust bearings.

[0006] The present invention is further configured such that the side surfaces of the shielded pump body are respectively fixedly connected with a heat exchange liquid outlet pipe and a heat exchange liquid inlet pipe, one end of the heat exchange liquid outlet pipe and one end of the heat exchange liquid inlet pipe are connected to the interior of the shielded pump body, and the heat exchange liquid outlet pipe is fixed on a side of the shielded pump body close to the liquid inlet, and the heat exchange liquid inlet pipe is fixed on a side of the shielded pump body away from the liquid inlet.

[0007] A heat exchanger is fixedly connected between the heat exchange liquid outlet pipe and the heat exchange liquid inlet pipe, and the other end of the heat exchange liquid outlet pipe and the other end of the heat exchange liquid inlet pipe are connected to the interior of the heat exchanger; a support frame is fixedly connected to the peripheral side of the shielded pump body, and the support frame is fixedly connected to the heat exchanger, and a shunt pipe is fixedly connected to the peripheral side of the heat exchanger, and one end of the shunt pipe is connected to the interior of the shielded pump body.

[0008] The present invention is further configured such that a shielded motor is provided on the circumferential side of the drive shaft, and the shielded motor consists of a rotor assembly and a stator assembly, the rotor assembly is fixedly connected to the circumferential side of the drive shaft, the stator assembly is fixedly connected to the inner wall of the shielded pump body, and the rotor assembly and the stator assembly are both isolated by a shielding sleeve; an axial gap is formed between the thrust plate and the thrust bearing close to the open impeller.

[0009] The present invention is further configured such that a liquid infusion pipe is fixedly connected to the side surface of the heat exchange liquid inlet pipe, the liquid infusion pipe is communicated with the interior of the heat exchange liquid inlet pipe, and a one-way valve is fixedly installed on the outside of the liquid infusion pipe and the heat exchange liquid inlet pipe, one end of the liquid infusion pipe is fixedly connected to a liquid infusion tank, and the liquid infusion pipe is communicated with the interior of the liquid infusion tank.

[0010] The present invention has the following beneficial effects: The present invention provides a shielded pump body, an open impeller and a thrust bearing, and utilizes the axial force generated by the rotation of the open impeller to adjust the axial clearance between the thrust bearing and the thrust plate, thereby driving the open impeller to move, so that the clearance between the open impeller and the shielded pump body is adjusted accordingly, thereby ensuring the clearance between the open impeller and the shielded pump body, thereby avoiding leakage of the medium through the open impeller and ensuring the medium conveying efficiency. At the same time, the open structural design of the open impeller facilitates the cleaning of the open impeller when the shielded pump body stops running, thereby avoiding the adhesion of the medium affecting the rotation of the open impeller and affecting the frequent starting and stopping of the shielded pump body.

[0011] 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

[0012] 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.

[0013] Figure 1 This is a longitudinal structural cross-sectional view of a slurry-type canned motor pump for conveying easily crystallized media.

[0014] Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0015] Figure 3 It is a schematic diagram of the structure of the open impeller in the present invention.

[0016] Figure 4 It is a schematic structural diagram of the thrust bearing in the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1-shielded pump body, 2-connector, 3-open impeller, 4-thrust plate, 5-thrust bearing, 6-heat exchanger, 7-shielded motor, 8-liquid replenishment tank. DETAILED DESCRIPTION

[0018] 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.

[0019] For specific embodiment 1, please refer to Figure 1-4 The present invention is a slurry-type canned electric pump for conveying easily crystallized media, including a canned pump body 1. Specifically, a driving shaft is rotatably arranged inside the canned pump body 1 through a bearing seat, and a connector 2 is fixedly connected to one end of the driving shaft close to the liquid inlet. An open impeller 3 is fixedly connected to one side of the connector 2. The open impeller 3 is composed of a plurality of blades and blade reinforcement ribs. The design of the open impeller 3 can facilitate the cleaning of the open impeller 3.

[0020] Furthermore, one end of the drive shaft away from the impeller 3 is fixedly connected to a thrust plate 4 , and two thrust bearings 5 ​​are symmetrically arranged on the circumferential side of the drive shaft. The thrust bearings 5 ​​are fixedly installed inside the shielded pump body 1 , and the thrust plate 4 is located between the two thrust bearings 5 ​​.

[0021] The operation process of this embodiment is as follows: when the shielded pump body 1 conveys the medium, under the action of the axial force, the driving shaft moves so that the interval 1 between the thrust bearing 5 and the thrust plate 4 changes, thereby maintaining the gap between the open impeller 3 and the shielded pump body 1, avoiding the leakage of the medium through the open impeller 3 during the medium conveying, thereby ensuring the medium conveying efficiency; the open structure of the open impeller 3 facilitates the cleaning of the open impeller 3 when the shielded pump body 1 is frequently started and stopped, thereby avoiding the medium from being stuck on the impeller and affecting the frequent starting and stopping of the shielded pump body 1.

[0022] For specific embodiment 2, please refer to Figure 1-4On the basis of the specific embodiment 1, specifically, a heat exchange liquid outlet pipe and a heat exchange liquid inlet pipe are fixedly connected to the side surfaces of the shielded pump body 1, one end of the heat exchange liquid outlet pipe and one end of the heat exchange liquid inlet pipe are connected to the interior of the shielded pump body 1, and the heat exchange liquid outlet pipe is fixed on a side of the shielded pump body 1 close to the liquid inlet, and the heat exchange liquid inlet pipe is fixed on a side of the shielded pump body 1 away from the liquid inlet.

[0023] Furthermore, a heat exchanger 6 is fixedly connected between the heat exchange liquid outlet pipe and the heat exchange liquid inlet pipe, the other end of the heat exchange liquid outlet pipe and the other end of the heat exchange liquid inlet pipe are connected to the interior of the heat exchanger 6, the medium can enter the heat exchanger 6 through the heat exchange liquid outlet pipe for heat exchange treatment, and the treated medium flows back to the shielded pump body 1 through the heat exchange liquid inlet pipe; a support frame is fixedly connected to the side surface of the shielded pump body 1, the support frame is fixedly connected to the heat exchanger 6, and a shunt pipe is fixedly connected to the side surface of the heat exchanger 6, and one end of the shunt pipe is connected to the interior of the shielded pump body 1.

[0024] Furthermore, a shielded motor 7 is provided on the peripheral side of the driving shaft, and the shielded motor 7 is composed of a rotor assembly and a stator assembly. The rotor assembly is fixedly connected to the peripheral side of the driving shaft, and the stator assembly is fixedly connected to the inner wall of the shielded pump body 1, and the rotor assembly and the stator assembly are isolated by a shielding sleeve; an axial gap is formed between the thrust plate 4 and the thrust bearing 5 close to the open impeller 3, (such as Figure 2 The area shown in FIG. 6A ) is formed by controlling the size of the axial clearance by the thrust bearing 5, so that the problem of low efficiency caused by leakage of the open impeller 3 can be avoided.

[0025] Furthermore, a liquid infusion pipe is fixedly connected to the side surface of the heat exchange liquid inlet pipe, the liquid infusion pipe is connected to the inside of the heat exchange liquid inlet pipe, and a one-way valve is fixedly installed on the outside of the liquid infusion pipe and the heat exchange liquid inlet pipe, and the flow direction of the medium is controlled by the one-way valve. One end of the liquid infusion pipe is fixedly connected to the liquid infusion tank 8, and the liquid infusion pipe is connected to the inside of the liquid infusion tank 8.

[0026] The operation process of this embodiment is as follows: when the shielded pump body 1 is conveying the medium, the shielded motor 7 is started, and the cooperation between the stator assembly and the rotor assembly drives the driving shaft to rotate, so that the open impeller 3 rotates synchronously. During the rotation of the open impeller 3, under the action of the axial force, an axial gap is formed between the thrust plate 4 and the thrust bearing 5 close to the open impeller 3, and the axial gap is adjusted accordingly. The open impeller 3 moves synchronously, so that the gap between the open impeller 3 and the shielded pump body 1 changes, so as to avoid the leakage of the medium through the open structure of the open impeller 3 during the medium conveying process, thereby affecting the medium conveying efficiency; when the shielded pump body 1 stops conveying, the open structure design of the open impeller 3 facilitates the cleaning of the open impeller 3, so as to avoid the transmitted medium adhering to the surface of the open impeller 3 and affecting the restart of the open impeller 3.

[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 slurry-type canned motor pump for conveying a medium that is easy to crystallize, comprising a canned pump body (1), characterized in that: A drive shaft is rotatably arranged inside the shielded pump body (1) via a bearing seat, one end of the drive shaft close to the liquid inlet is fixedly connected to a connector (2), one side of the connector (2) is fixedly connected to an open impeller (3), and the open impeller (3) is composed of a plurality of blades and blade reinforcement ribs; One end of the drive shaft away from the impeller (3) is fixedly connected to a thrust plate (4), and two thrust bearings (5) are symmetrically arranged on the circumferential side of the drive shaft. The thrust bearings (5) are fixedly mounted inside the shielded pump body (1), and the thrust plate (4) is located between the two thrust bearings (5).

2. A slurry-type canned motor pump for conveying easily crystallized media according to claim 1, characterized in that: A heat exchange liquid outlet pipe and a heat exchange liquid inlet pipe are respectively fixedly connected to the peripheral side of the shielded pump body (1); one end of the heat exchange liquid outlet pipe and one end of the heat exchange liquid inlet pipe are in communication with the interior of the shielded pump body (1); the heat exchange liquid outlet pipe is fixed to a side of the shielded pump body (1) close to the liquid inlet, and the heat exchange liquid inlet pipe is fixed to a side of the shielded pump body (1) away from the liquid inlet.

3. A slurry-type canned motor pump for conveying easily crystallized media according to claim 2, characterized in that: A heat exchanger (6) is fixedly connected between the heat exchange liquid outlet pipe and the heat exchange liquid inlet pipe, and the other end of the heat exchange liquid outlet pipe and the other end of the heat exchange liquid inlet pipe are in communication with the interior of the heat exchanger (6).

4. A slurry-type canned motor pump for conveying easily crystallized media according to claim 3, characterized in that: A support frame is fixedly connected to the peripheral side of the shielded pump body (1), the support frame is fixedly connected to the heat exchanger (6), and a shunt pipe is fixedly connected to the peripheral side of the heat exchanger (6), one end of the shunt pipe is connected to the inside of the shielded pump body (1).

5. A slurry-type canned motor pump for conveying easily crystallized media according to claim 4, characterized in that: A shielded motor (7) is arranged on the peripheral side of the drive shaft, and the shielded motor (7) is composed of a rotor assembly and a stator assembly. The rotor assembly is fixedly connected to the peripheral side of the drive shaft, and the stator assembly is fixedly connected to the inner wall of the shielded pump body (1), and the rotor assembly and the stator assembly are both isolated by a shielding sleeve.

6. A slurry-type canned motor pump for conveying easily crystallized media according to claim 5, characterized in that: An axial gap is formed between the thrust plate (4) and the thrust bearing (5) close to the open impeller (3).

7. A slurry-type canned motor pump for conveying easily crystallized media according to claim 6, characterized in that: A liquid replenishment pipe is fixedly connected to the side surface of the heat exchange liquid inlet pipe, the liquid replenishment pipe is communicated with the interior of the heat exchange liquid inlet pipe, and a one-way valve is fixedly installed on the outside of the liquid replenishment pipe and the heat exchange liquid inlet pipe. One end of the liquid replenishment pipe is fixedly connected to a liquid replenishment tank (8), and the liquid replenishment pipe is communicated with the interior of the liquid replenishment tank (8).

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