Novel high-rotating-speed direct connection type multistage stamping and welding centrifugal pump

Abstract

The utility model relates to a novel high-rotating-speed direct connection type multistage stamping and welding centrifugal pump which comprises a lengthened motor shaft, an impeller, a guide vane, a middle section, a shaft sleeve, a water inlet and outlet section, a shaft end nut, an upper shell, a gasket, a mechanical seal, a water retaining ring, a high-speed permanent magnet motor and a deflation valve. The water inlet and outlet flanges are arranged on the same side; the high-speed permanent magnet motor is fixedly installed on a support of the upper shell, and the middle section is fixedly arranged above the water inlet and outlet section; a space for placing a machine seal is reserved in the middle of the upper shell, a supporting flange of a stand column structure is arranged above the upper shell, the supporting flange and the high-speed permanent magnet motor are fixed, a deflation channel is formed in the supporting flange of the stand column structure, and a deflation valve is installed in the deflation channel; the water retaining ring is sleeved on the motor shaft, and the water retaining ring is arranged between the support flange and the high-speed permanent magnet motor. The device is compact in structure, high in rigidity, high in efficiency and good in universality.

Description

TECHNICAL FIELD

[0001] The utility model relates to a centrifugal pump, concretely relates to a novel high-speed direct-connection type multistage stamping and welding centrifugal pump which is compact in structure, strong in rigidity, high in efficiency and good in universality. BACKGROUND

[0002] The existing centrifugal pump products generally use ordinary three-phase asynchronous motor to drive, the guide vane and the middle section of the multistage centrifugal pump, the pump cover and the last guide vane basically adopt sectional design, and the structure has the advantages of simple structure, convenient and fast manufacturing, and the disadvantages of high cost, large machining amount and high material consumption. In terms of water power, the method of small sealing ring gap is generally adopted to reduce the axial flow of the impeller front cover plate and the inlet, and to improve the efficiency, which makes the precision requirement of the sealing ring higher, and once the sealing ring is worn, the gap is enlarged, and the efficiency is rapidly and obviously reduced; and due to the multiple matching surfaces, the assembly cumulative error is large, and the precision cannot be guaranteed; under the current background of energy saving, environmental protection and low carbon, it is an urgent demand of every manufacturer to develop a product which is low in development cost, convenient to manufacture, high in reliability, environmental protection and energy saving. SUMMARY

[0003] In view of the above problems, the main purpose of the utility model is to provide a novel high-speed direct-connection type multistage stamping and welding centrifugal pump which is compact in structure, strong in rigidity, high in efficiency and good in universality.

[0004] The utility model solves the above technical problem through the following technical scheme: a novel high-speed direct-connection type multistage stamping and welding centrifugal pump, the novel high-speed direct-connection type multistage stamping and welding centrifugal pump includes an elongated motor shaft, an impeller, a guide vane, a middle section and a shaft sleeve, and the novel high-speed direct-connection type multistage stamping and welding centrifugal pump further includes an inlet and outlet section, a shaft end nut, an upper shell, a gasket, a mechanical seal, a water baffle ring, a high-speed permanent magnet motor and a gas release valve.

[0005] The inlet and outlet flanges of the novel high-speed direct-connection type multistage stamping and welding centrifugal pump are arranged on the same side; the high-speed permanent magnet motor is fixedly installed on the support of the upper shell, the lowermost impeller is fixed on the motor shaft by the shaft end nut, the shaft sleeve is sleeved on the motor shaft, and the middle section is fixedly arranged above the inlet and outlet section.

[0006] The upper shell has a space for placing the mechanical seal, the upper shell has a support flange with a column structure above, the support flange is fixed with the high-speed permanent magnet motor, the support flange with the column structure is provided with a gas release channel, the gas release valve is installed in the gas release channel, the sealing ring is arranged between the middle section and the upper shell, and the middle section and the upper shell are fixed together by bolts; the water baffle ring is sleeved on the motor shaft, and the water baffle ring is located between the support flange and the high-speed permanent magnet motor.

[0007] In the specific embodiment of the utility model, the inlet and outlet section and the middle section are matched by a stopper, and are sealed by bolts and a sealing ring.

[0008] In the embodiment of the utility model, the inlet and outlet section is integrally processed and formed by casting.

[0009] In the embodiment of the utility model, the middle section is integrally processed and formed by casting.

[0010] In the embodiment of the utility model, the support flange is fixed with the high-speed permanent magnet motor by bolts.

[0011] In the embodiment of the utility model, the air release valve is provided with threads, and is screwed onto the support flange of the column structure.

[0012] In the embodiment of the utility model, the impeller is formed by stamping and welding of stainless steel plates, and is fixed on the lengthened motor shaft by a spline shaft and directly driven.

[0013] In the embodiment of the utility model, the guide vane comprises front and rear cover plates, blades, a support seat and a sealing ring.

[0014] In the embodiment of the utility model, the front and rear cover plates and the blades are formed by stamping and welding.

[0015] The utility model discloses a new high-speed direct-connection multi-stage stamping and welding centrifugal pump, which has the following advantages compared with the common technology: the inlet and outlet section, the middle section and the upper shell are integrally processed and formed by casting, the inlet and outlet flanges are arranged on the same side, facilitating the pipeline arrangement in a narrow space; the impeller is formed by stamping and welding of stainless steel plates, and is fixed on the lengthened motor shaft by a spline shaft and directly driven; the guide vane body is formed by stamping and welding, and has high hydraulic efficiency; the upper shell simultaneously considers the hydraulic performance and the structural load bearing, has smaller size and more compact structure; the shaft end sealing adopts a container type mechanical seal, ensuring no leakage; the high-speed permanent magnet motor is placed on the upper shell and is fixed by bolts, and has a lengthened shaft direct-connection design, high energy conversion efficiency, smaller size, further reduced unit volume and more extensive application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure schematic view of the utility model high-speed direct-connection multi-stage stamping and welding centrifugal pump.

[0017] Figure 2 It is a structure schematic view of the utility model high-speed direct-connection multi-stage stamping and welding centrifugal pump inlet and outlet section.

[0018] Figure 3 It is a structure schematic view of the utility model high-speed direct-connection multi-stage stamping and welding centrifugal pump middle section.

[0019] Figure 4The high-speed direct-connection multi-stage stamping and welding centrifugal pump guide vane structure diagram.

[0020] Figure 5 The high-speed direct-connection multi-stage stamping and welding centrifugal pump upper shell structure diagram.

[0021] The following is the name corresponding to the label in the utility model:

[0022] The water inlet and outlet section 1, the shaft end nut 2, the shaft sleeve 3, the impeller 4, the guide vane 5, the middle section 6, the sealing ring 7, the bolt 8, the upper shell 9, the gasket 10, the mechanical seal 11, the water baffle 12, the high-speed permanent magnet motor 13, the bolt 14 and the air release valve 15. DETAILED DESCRIPTION

[0023] The following will give the preferred embodiment of the utility model in conjunction with the drawings to explain the technical scheme of the utility model in detail.

[0024] Figure 1 The high-speed direct-connection multi-stage stamping and welding centrifugal pump structure diagram. Figure 1 As shown in the utility model discloses a kind of new high-speed direct-connection multi-stage stamping and welding centrifugal pump, the new high-speed direct-connection multi-stage stamping and welding centrifugal pump includes lengthened motor shaft, impeller 4, guide vane 5, middle section 6, shaft sleeve 3, water inlet and outlet section 1, shaft end nut 2, upper shell 9, gasket 10, mechanical seal 11, water baffle 12, high-speed permanent magnet motor 13, air release valve 15.The water inlet and outlet flange of new high-speed direct-connection multi-stage stamping and welding centrifugal pump is arranged in the same side;High-speed permanent magnet motor 13 is fixedly installed on the support of upper shell 9, the lowermost impeller 4 is fixed on motor shaft using shaft end nut 2, shaft sleeve 3 is sleeved on motor shaft, middle section 6 is fixedly arranged above water inlet and outlet section 1, the space for placing mechanical seal 11 is left in the middle part of upper shell 9, there is the support flange of column structure on the upper of upper shell 9, the support flange is fixed with high-speed permanent magnet motor 13, air release passage is arranged in the support flange of column structure, air release valve 15 is installed in air release passage.Middle section 6 and upper shell 9 are fixed together using bolt 8 by being provided with sealing ring 7 between middle section 6 and upper shell 9 (participate Figure 5 )。 Water baffle 12 is sleeved on motor shaft, and water baffle 12 is located between support flange and high-speed permanent magnet motor 13.

[0025] The water inlet and outlet section 1 of the utility model (participate Figure 2 ) and the middle section 6 (participate Figure 3 ) are matched with the stop opening, and are sealed by bolt and sealing ring simultaneously.The water inlet and outlet section 1 of the utility model is integrally processed and formed by casting;In the specific implementation process, the middle section 6 of the utility model is integrally processed and formed by casting.The support flange of the utility model is fixed with high-speed permanent magnet motor 13 using bolt 14.The air release valve 15 of the utility model (participateFigure 1 ) is screwed to the support flange of the column structure. The impeller 4 of the utility model is an impeller formed by stamping and welding of stainless steel plate, and the impeller 4 is fixed on the lengthened motor shaft by means of spline shaft and is directly driven. The guide vane 5 (see Figure 4 ) comprises front and rear cover plates, blades, support seats and sealing rings, and the front and rear cover plates and the blades are composed of stamping and welding parts.

[0026] In the specific implementation process, the inlet and outlet section in the utility model is combined and cast into one body by the elbow type suction chamber and a part of the water outlet elbow. The whole is cast and processed into shape, the right side outlet and the left side inlet are located on the same side, and a special-shaped flange needs to be configured. The upper and middle sections 6 of the inlet and outlet section are cooperated with the stop opening, are fixed by bolts and are sealed by sealing rings. The water outlet cavity of the inlet and outlet section can be installed with a check valve (not shown on the drawing) to avoid the water hammer effect and backflow of the pipeline. The structure is simple and compact, the appearance is beautiful, and the reliability is high.

[0027] Figure 3 It is a middle section structure diagram of the high-speed direct-connection type multi-stage stamping and welding centrifugal pump, and the upper and lower surfaces of the middle section are fixed on the upper shell 9 and the inlet and outlet section 1 by bolts respectively, and the casting process is used to cast the blank to ensure the smooth internal water flow channel, and the mating surface is machined. The component is reliable in bearing and pressure, smooth in flow channel and good in flow guiding capacity.

[0028] Figure 4 It is a guide vane structure diagram of the high-speed direct-connection type multi-stage stamping and welding centrifugal pump. The guide vane is composed of front and rear cover plates, blades, support seats and sealing rings. The front and rear cover plates and the blades of the guide vane are stamped in batches by steel plate, the support seats are machined, and the sealing rings are made of polytetrafluoroethylene and are fixed in the support seats by pressing pieces. The components are fastened and connected by the welding process, which is convenient and reliable. The floating sealing technology is used, the sealing ring is arranged in the support seat, the sealing performance is better, and the hydraulic efficiency is high.

[0029] Figure 5The upper shell of the high-speed direct-connection multi-stage stamping and welding centrifugal pump is a structure schematic view of the upper shell of the new type high-speed direct-connection multi-stage stamping and welding centrifugal pump, the upper shell combines the modeling and function of the centrifugal pump volute and bears the function of supporting the motor, and is cast from stainless steel material. The inside cavity of the upper shell is the water outlet space of the impeller and is consistent with the function of the centrifugal pump volute, guides the high-speed water flow spun by the impeller to reduce speed and increase pressure, and flows into the water outlet section. The middle part of the upper shell 9 is provided with a space for placing the mechanical seal 11, and the upper part is provided with a column structure supporting a flange, the flange is matched with the high-speed permanent magnet motor 13, and is fastened by bolts. The column is provided with a gas discharge channel and is provided with a gas discharge valve 15, which is used for discharging dry air before the pump starts to avoid the dry grinding of the mechanical seal 11 from being burned. The upper shell 9 is compact in structure, high in pressure bearing strength, and has double functions of hydraulic performance and structural parts, is convenient to disassemble and assemble, is light in weight compared with the traditional split type design, is significantly reduced in machining, is more reasonable and compact in assembly with other parts, reduces the assembly error and is low in cost.

[0030] The basic principle and main features of the utility model and the advantages of the utility model are shown and described. It should be understood by the person skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only used to illustrate the principle of the utility model, various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, the changes and improvements all fall within the scope of the utility model claimed, and the scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A new type of high-speed direct-coupled multi-stage stamping welded centrifugal pump, the new type of high-speed direct-coupled multi-stage stamping welded centrifugal pump comprising a lengthened motor shaft, an impeller, a guide vane, a middle section, a shaft sleeve, characterized in that: The new high-speed direct connection type multi-stage stamping welded centrifugal pump further comprises an inlet and outlet water section, a shaft end nut, an upper shell, a gasket, a mechanical seal, a water baffle, a high-speed permanent magnet motor and a gas release valve. The inlet and outlet water flanges of the new high-speed direct connection type multi-stage stamping welded centrifugal pump are arranged on the same side; the high-speed permanent magnet motor is fixedly installed on a support of the upper shell; the lowest impeller is fixed on the motor shaft by the shaft end nut; the shaft sleeve is sleeved on the motor shaft; the middle section is fixedly arranged above the inlet and outlet water section. The upper shell has a space for placing the mechanical seal in the middle part; the upper shell has a support flange with a column structure above; the support flange is fixed with the high-speed permanent magnet motor; the support flange with the column structure is provided with a gas release passage; the gas release valve is installed in the gas release passage; the sealing ring is arranged between the middle section and the upper shell; the middle section and the upper shell are fixed together by bolts; the water baffle is sleeved on the motor shaft and located between the support flange and the high-speed permanent magnet motor.

2. The novel high speed direct coupled multistage impeller welded centrifugal pump of claim 1, wherein: The inlet and outlet water section is cooperated with the middle section by a stop opening, and is sealed by bolts and a sealing ring.

3. The novel high speed direct coupled multistage impeller welded centrifugal pump of claim 1, wherein: The inlet and outlet water section is integrally machined by casting.

4. The novel high speed direct coupled multistage impeller welded centrifugal pump of claim 1, wherein: The middle section is integrally machined by casting.

5. The novel high rotational speed direct coupled multi-stage impeller welded centrifugal pump of claim 1, wherein: The support flange is fixed with the high-speed permanent magnet motor by bolts.

6. The new high rotational speed direct coupled multi-stage impeller welded centrifugal pump of claim 1, wherein: The gas release valve is provided with threads and is screwed onto the support flange with the column structure.

7. The new high rotational speed direct coupled multi-stage impeller welded centrifugal pump of claim 1, wherein: The impeller is formed by stamping and welding of stainless steel plates; the impeller is fixed on the lengthened motor shaft by a spline shaft and is directly driven.

8. The new high rotational speed direct coupled multi-stage impeller welded centrifugal pump of claim 1, wherein: The guide vane comprises front and rear cover plates, blades, support seats and sealing rings.

9. The novel high rotational speed direct coupled multi-stage impeller welded centrifugal pump of claim 8, wherein: The front and rear cover plates and the blades are formed by stamping and welding.

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