High-pressure shield pump

Abstract

The utility model discloses a high-pressure shield pump. Comprising a pump body, an impeller, a first companion flange, an outer circulation pipeline, a second companion flange, a fourth hole, a third hole, a rear bearing body, a second hole, a second bearing three-piece set, an auxiliary impeller, a second cavity, a rotor assembly, a motor gap, a stator isolation sleeve, a first cavity, a first bearing three-piece set, a front bearing body, a wear-resisting plate, an inducer and a first hole. According to the utility model, the inducer is arranged at the inlet of the pump to reduce the net positive suction head of the pump, so that inlet cavitation is prevented, and dual pressurization is realized by a method of improving the pressure of the circulating inlet and arranging the auxiliary impeller inside, so that medium gasification is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration shielded pumps, in particular to a high-pressure shielded pump. Background Art

[0002] In the chemical, petrochemical, refrigeration, pharmaceutical and other industries, due to the characteristics of the medium itself (flammable, explosive, toxic, harmful, expensive, easy to vaporize, etc.), safety regulations, equipment quality level and sensitivity to environmental changes, there are strict restrictions on the release of chemicals in various places to prevent environmental pollution and damage. Today, two widely recognized leak-free pumps: magnetic pumps and shielded pumps can well meet such a requirement: completely leak-free. With the continuous improvement of environmental protection requirements, the application of seal-free centrifugal pumps is becoming more and more extensive.

[0003] Among them, shielded pumps occupy a very important position, with excellent performances such as strong pressure bearing capacity, wide temperature range of conveying medium, small footprint, low noise, safety and stability, etc. Conveying easily vaporized medium has always been a difficult problem in various industries, such as medium viscosity, specific heat, flow, head, density, inlet vaporization pressure, suction pressure, vaporization temperature, operating temperature, presence of particles, cavitation margin, etc. should be fully considered in order to select the appropriate pump type.

[0004] The traditional working mode for easily vaporized media adopts high-pressure internal circulation, but different media have different specific heat, vaporization heat, and temperature rise. As far as the vaporization pressure is concerned, the vaporization curve is very steep. If the temperature rises a little, the vaporization pressure will rise a lot. When the working conditions have been determined, it is difficult to lower the temperature. The only way is to increase the pressure. There must be enough pressure to ensure that the medium does not vaporize, and at the same time, to ensure that cavitation does not occur at the pump inlet. Therefore, it is necessary to propose a high-pressure canned pump to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a high-pressure canned pump, aiming to improve the pressurization means and cavitation treatment in the prior art for highly vaporizable media, thereby ensuring the safe operation of the canned pump and improving the efficiency of the canned pump.

[0006] The utility model provides a high-pressure shielded pump, comprising: a pump body, an impeller, a first matching flange, an external circulation pipeline, a second matching flange, a fourth hole, a third hole, a rear bearing body, a second hole, a second bearing three-piece set, an auxiliary impeller, a second chamber, a rotor assembly, a motor gap, a stator isolation sleeve, a first chamber, a first bearing three-piece set, a front bearing body, a wear-resistant plate, an inducer, and a first hole;

[0007] The mating flange of the pump body is connected to the first mating flange, and an external circulation pipeline is provided between the first mating flange and the second mating flange; the second mating flange is connected to the mating flange on the rear bearing body, and a fourth hole is formed in the middle of the rear bearing body; the front part of the rear bearing body is fixedly connected to a second bearing set, and a third hole is arranged above the rear end of the second bearing set;

[0008] The rotor assembly is rotatably connected inside the second bearing set. An auxiliary impeller is arranged at the rear end of the rotor assembly. A second hole is formed at the rear end of the rotor assembly and is communicated with the auxiliary impeller. A second chamber is left in front of the auxiliary impeller. The second chamber is communicated with the first chamber through a motor clearance. The front part of the rotor assembly is rotatably connected to a first bearing set. The first bearing set is externally fixedly connected to the front bearing body. The front bearing body is provided with a first hole. A wear-resistant plate is arranged at the front part of the front bearing body. An impeller is arranged in front of the wear-resistant plate. An inducer is arranged in front of the impeller.

[0009] Further, the mating flange of the pump body and the first mating flange are connected by stud bolts and nuts.

[0010] Further, the second mating flange and the mating flange on the rear bearing body are connected by stud bolts and nuts.

[0011] Further, a stator isolation sleeve is arranged on the outer periphery of the rotor assembly.

[0012] The utility model has the following beneficial effects: In the high-pressure canned motor pump of the utility model, the medium flows out from the pump outlet through the inducer and the impeller in sequence. Part of the medium will enter the rear bearing body from the pump outlet through the first pipeline, and then flow into the auxiliary impeller through the hole formed in the rotor assembly. After being pressurized by the auxiliary impeller, it flows into the first chamber through the motor clearance from the second chamber, and then flows into the pump body through the through hole formed in the front bearing body. By arranging an inducer at the pump inlet to reduce the net positive suction head of the pump, the occurrence of inlet cavitation is prevented, and double pressurization is achieved by increasing the circulating inlet pressure and arranging an auxiliary impeller inside, thereby preventing the gasification of the medium. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a cross-sectional view of the high-pressure canned motor pump provided by the present utility model.

[0015] Illustration: 1 - pump body; 2 - impeller; 3 - first mating flange; 4 - external circulation pipeline; 5 - second mating flange; 6 - fourth hole; 7 - third hole; 8 - rear bearing housing; 9 - second hole; 10 - second bearing set; 11 - auxiliary impeller; 12 - second chamber; 13 - rotor assembly; 14 - motor clearance; 15 - stator isolation sleeve; 16 - first chamber; 17 - first bearing set; 18 - front bearing housing; 19 - wear plate; 20 - inducer; 21 - first hole. Detailed implementation mode

[0016] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine the embodiments to detail the present invention. It should be pointed out that the following detailed description is illustrative and aims to provide further description of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0017] For the sake of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper" etc. can be used here to describe the spatial positional relationship between one device or feature and other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation shown in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations will be made for the spatial relative descriptions used here.

[0018] Now, the exemplary embodiments according to this application will be described in more detail with reference to the drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions is enlarged, and the same reference numerals are used to denote the same devices, and thus their descriptions will be omitted.

[0019] Please refer to Figure 1, an embodiment of the present utility model provides a high-pressure canned motor pump, including: pump body 1, impeller 2, first mating flange 3, external circulation pipeline 4, second mating flange 5, fourth hole 6, third hole 7, rear bearing housing 8, second hole 9, second bearing set 10, auxiliary impeller 11, second chamber 12, rotor assembly 13, motor clearance 14, stator isolation sleeve 15, first chamber 16, first bearing set 17, front bearing housing 18, wear-resistant plate 19, inducer 20, first hole 21.

[0020] Among them, the mating flange of the pump body 1 is connected to the first mating flange 3 with stud bolts and nuts. An external circulation pipeline 4 is arranged between the first mating flange 3 and the second mating flange 5. The external circulation pipeline 4 arranged between the first mating flange 3 and the second mating flange 5 provides an independent cooling circulation channel for the pump body, which can effectively reduce the temperature of the pump body and bearing components, prevent performance degradation or failure caused by medium vaporization, and extend the service life of the pump. The mating flange on the second mating flange 5 and the rear bearing housing 8 is connected with stud bolts and nuts. A fourth hole 6 is opened in the middle of the rear bearing housing 8; the second bearing set 10 is fixedly connected to the front of the rear bearing housing 8, and a third hole 7 is arranged above the rear end of the second bearing set 10.

[0021] The rotor assembly 13 is rotatably connected inside the second bearing set 10. A stator isolation sleeve 15 is arranged on the outer periphery of the rotor assembly 13. By adopting the tight fit between the stator isolation sleeve 15 and the rotor assembly 13, efficient sealing of the medium inside the pump is achieved, effectively preventing the leakage of high-pressure and easily vaporized medium in the pump body, ensuring the stable operation and refrigeration efficiency of the pump. An auxiliary impeller 11 is arranged at the rear end of the rotor assembly 13. A second hole 9 is opened at the rear end of the rotor assembly 13 and is communicated with the auxiliary impeller 11. A second chamber 12 is left in front of the auxiliary impeller 11. The second chamber 12 is communicated with the first chamber 16 through the motor clearance 14. The front of the rotor assembly 13 is rotatably connected to the first bearing set 17. The first bearing set 17 is fixedly connected to the outside of the front bearing housing 18. The second bearing set 10 and the first bearing set 17 are respectively located at the front and rear ends of the rotor assembly 13, providing stable support and precise guidance, ensuring the stability and balance of the rotor assembly during high-speed rotation, and reducing vibration and noise. A first hole 21 is opened in the front bearing housing 18. A wear-resistant plate 19 is arranged in front of the front bearing housing 18. An impeller 2 is arranged in front of the wear-resistant plate 19. An inducer 20 is arranged in front of the impeller 2. The setting of the wear-resistant plate 19 effectively protects the impeller 2 and the inducer 20 from the direct impact of impurities in the medium, and extends the service life of key components. At the same time, the introduction of the inducer 20 optimizes the suction performance of the medium, improves the suction efficiency and cavitation resistance of the pump. The entire pump body adopts a modular design, and each component is connected by standard parts such as stud bolts and nuts, which is convenient for disassembly and replacement, reducing maintenance costs and time.

[0022] The main passage after the high-pressure shielded pump of the utility model starts: the medium flows in from the inlet of the pump body 1, passes through the inducer 20 to reduce the net positive suction pressure, effectively improves the suction performance and anti-cavitation performance of the pump, and then flows to the outlet of the pump body 1 through the impeller 2. Part of the medium will flow into the external circulation pipeline 4 through the matching flange at the outlet of the pump body 1, and then flow into the rear bearing body 8, and flow into the auxiliary impeller 11 through the second hole 9. After the pressurization of the auxiliary impeller 11, the medium pressure is higher than the vaporization pressure, preventing the bearing from being insufficiently lubricated and dry friction caused by the vaporization of the medium. The medium flows from the second chamber 12 through the motor gap 14 into the first chamber 16, and flows into the pump body 1 through the first hole 21 opened on the front bearing body 18 to form a cycle. This process will also take away part of the motor heat to ensure the stable operation of the pump.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0025] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A high-pressure canned motor pump, characterized in that, Including: Pump body (1), impeller (2), first mating flange (3), external circulation pipeline (4), second mating flange (5), fourth hole (6), third hole (7), rear bearing housing (8), second hole (9), second bearing set (10), auxiliary impeller (11), second chamber (12), rotor assembly (13), motor clearance (14), stator isolation sleeve (15), first chamber (16), first bearing set (17), front bearing housing (18), wear-resistant plate (19), inducer (20), first hole (21); The mating flange of the pump body (1) is connected to the first mating flange (3), and an external circulation pipeline (4) is arranged between the first mating flange (3) and the second mating flange (5); the second mating flange (5) is connected to the mating flange on the rear bearing housing (8), and a fourth hole (6) is provided in the middle of the rear bearing housing (8); the front part of the rear bearing housing (8) is fixedly connected to the second bearing set (10), and a third hole (7) is arranged above the rear end of the second bearing set (10); The rotor assembly (13) is rotatably connected inside the second bearing set (10), an auxiliary impeller (11) is arranged at the rear end of the rotor assembly (13), a second hole (9) is provided at the rear end of the rotor assembly (13) and is communicated with the auxiliary impeller (11), a second chamber (12) is left at the front of the auxiliary impeller (11), the second chamber (12) is communicated with the first chamber (16) through the motor clearance (14), the front part of the rotor assembly (13) is rotatably connected to the first bearing set (17), the first bearing set (17) is fixedly connected to the outside of the front bearing housing (18), a first hole (21) is provided in the front bearing housing (18), a wear-resistant plate (19) is arranged at the front of the front bearing housing (18), an impeller (2) is arranged in front of the wear-resistant plate (19), and an inducer (20) is arranged in front of the impeller (2).

2. The high-pressure canned motor pump according to claim 1, wherein The mating flange of the pump body (1) and the first mating flange (3) are connected by stud bolts and nuts.

3. A high-pressure canned motor pump according to claim 1, characterized in that, The second mating flange (5) and the mating flange on the rear bearing housing (8) are connected by stud bolts and nuts.

4. A high-pressure canned motor pump according to claim 1, characterized in that, A stator isolation sleeve (15) is arranged on the outer periphery of the rotor assembly (13).

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