High-lift double suction pump with compact structure and design method of compact diffusion chamber in double suction pump

Abstract

The invention relates to a high-lift double-suction pump with a compact structure and a design method of a compact diffusion chamber in the double-suction pump, and the pump adopts an inclined middle open type split structure and comprises a pump body, a sealing body, a thrust bearing, a first water guide bearing, a second water guide bearing, a pump cover, a locking sleeve, an impeller, a shaft, a mechanical seal component and the like. The shaft is connected with the impeller through a key, the locking sleeve is located on the non-driving side, the shaft is sleeved with the locking sleeve in a position-adjustable mode, the central position of hydraulic power is adjusted through the locking sleeve, the sealing body is installed in the locking sleeve, then the first water guide bearing, the second water guide bearing and the thrust bearing are combined to be fixed, and a complete middle rotating structure is formed. Cavitation resistance of a pump inlet is improved by raising the centers of the water inlet and the water outlet, meanwhile, the space of the water inlet and the water outlet is fully utilized, and the shell is made into an inclined middle opening type structure; the sealing body structure serves as a hydraulic component and also has the function of a sealing installation body, the replaceability of parts on the two sides is met, and inspection and maintenance are convenient; the water guide bearing structure reduces the pump type and prolongs the service life of the pump.

Description

Technical Field

[0001] The present invention relates to a high-lift double-suction pump and a design method for a diffusion chamber in the double-suction pump, and in particular to a high-lift double-suction pump with a compact structure and high reliability, which divides a radial load test module and an axial load test module into two independent test modules, and a design method for a compact diffusion chamber in the double-suction pump. Background Art

[0002] The split case double suction pump is a horizontal shaft, double suction, single stage, double suction centrifugal pump. The impeller is located in the center of the pump, and the suction liquid enters the impeller from both sides, and the liquid is discharged through the impeller at the center outlet of the pump body. Compared with other types of centrifugal pumps, the double suction split case pump has the advantages of good balance, balanced force, strong applicability, and easy maintenance. It is widely used in construction, water treatment, power generation, metallurgy, petrochemical industry, etc. They are usually used to transport large amounts of clean water, circulating water, cooling water, crude oil, refining and other liquids.

[0003] Existing single-stage double-suction pumps are split with the middle opening surface as the center ( Figure 5 ), at this time, the design space requirements of the water inlet diameter often cause system piping layout problems, the efficiency is not up to the energy-saving standard, the pump center is relatively high, the vibration is relatively large, the anti-cavitation performance is weak, and cavitation is easy to occur. At the same time, a low pump foot double-suction pump is designed in the use process to meet the flow and head requirements, making the structure more compact, occupying a smaller area, reasonable design, and easy installation.

[0004] To address these issues, a compact diffusion chamber design approach was adopted, which has good versatility, low installation cost and easy maintenance. Summary of the invention

[0005] In view of the above problems, the main purpose of the present invention is to provide a high-lift double-suction pump with a more compact structure and a design method for a compact diffusion chamber in the double-suction pump, which is designed in a compact manner by changing the form of the middle open surface, a special sealing structure, and adopting sliding guide bearings for bearings, while ensuring performance optimization.

[0006] The present invention solves the above technical problems through the following technical solutions: a compact high-lift double-suction pump, the compact high-lift double-suction pump adopts an oblique center-open split structure, and the compact high-lift double-suction pump comprises: a pump body, a key, a sealing body, a thrust bearing, a first water guide bearing, a pump cover, a locking sleeve, an impeller, a second water guide bearing, a shaft, and a mechanical seal component.

[0007] The thrust bearing and the first water-guided bearing are located on the non-driving side, the second water-guided bearing is located on the driving side, the sealing body on the non-driving side is located between the pump body, the bearing end cover, the thrust bearing and the first water-guided bearing, and the sealing body on the driving side is located between the pump body and the second water-guided bearing.

[0008] The shaft is connected to the impeller through a key, and the locking sleeve is located on the non-driving side. The locking sleeve is adjustably mounted on the shaft. The hydraulic center position is adjusted through the locking sleeve, and the sealing body is installed. Then, it is fixed in combination with the first water guide bearing, the second water guide bearing, and the thrust bearing to form a complete intermediate rotating structure.

[0009] In a specific implementation example of the present invention, the bearing and the sealing body are positioned by pins, the bayonet of the sealing body is directly installed on the slot of the pump body, the pump cover is put on and the bolts and nuts with the oblique center open surface are tightened, the assembly is completed, and the internal flushing pipe is connected through a flexible joint.

[0010] In a specific implementation example of the present invention, the impeller is sleeved on the shaft, positioned with a circumferential direction key, the impeller is locked by a locking sleeve and a step on the shaft, a sealing body is installed, a first water guide bearing and a second water guide bearing are installed, the first water guide bearing, the second water guide bearing and the sealing body are tightly matched, a pin is installed to position the first water guide bearing and the second water guide bearing with the sealing body, then a thrust bearing is installed at the non-driving end to bear the axial force brought by the pump, and the thrust bearing is positioned by a round nut and a shaft step; an impeller sealing ring is installed, the entire rotor component is placed on the pump body, the impeller sealing ring is placed in the center of the pump body, and the relative position of the impeller center and the housing is adjusted.

[0011] In a specific implementation example of the present invention, the compact high-lift double-suction pump further includes internal flushing pipes installed on both the driving side and the non-driving side, and the two ends of the internal flushing pipes are respectively installed on the pump cover and the pump body.

[0012] In a specific implementation example of the present invention, the first O-ring is inserted into the sealing body, and there is a groove between the sealing body and the pump body for positioning. The gasket cover is placed on the pump cover, and the sealing body and the pump cover are also positioned by the groove. At the same time, there is a first O-ring seal, and the pump cover and the pump body are positioned by the screw tail cone pin, and the double-headed stud with a center open surface, the second gasket and the round head nut are installed; the bolts, the first gasket, the mechanical seal components and the bearing end cover are tightened, and the assembly is completed; the flushing pipe is connected through a flexible joint; the square head stud is for disassembly.

[0013] In a specific implementation example of the present invention, an oblique center-open split structure is adopted to separate the water body partition part from the pump body.

[0014] In a specific implementation example of the present invention, the water body baffle is on the sealing body, and after the sealing body is installed with the alignment pins, the baffle and the pump body form a complete water inlet fluid form.

[0015] A design method for a compact diffusion chamber in a compact high-lift double-suction pump, the method optimizing the following structures:

[0016] (1) Optimize the flow channel using a compact diffusion chamber flow channel design method:

[0017] Step (101), optimizing the flow field in the semi-spiral suction chamber, increasing the streamline curvature while improving the inlet center position, reducing suction loss, thereby improving the anti-cavitation performance of the pump; and using a double-suction symmetrical impeller to minimize the axial force and achieve high efficiency in the entire operating range;

[0018] Step (102), align the center height of the water outlet with the center height of the water inlet to facilitate on-site pipeline layout,

[0019] Step (103), the partition is located in the middle part, which is convenient for the common use of the sealing bodies on both sides in terms of structure; the angle α between the splitting surface and the center opening line is in the range of 9° to 15°;

[0020] (2) Adopt oblique center-open split structure;

[0021] (3) Adopt water-guided bearing structure and eliminate rolling bearing and bearing body;

[0022] (4) The slot sealing structure in the sealing body.

[0023] The positive progressive effects of the present invention are: the present invention provides a compact structure high-lift double-suction pump and a design method for a compact diffusion chamber in the double-suction pump. The present invention adopts an oblique center-open split structure to reduce the suction height, reduce the cavitation margin, lower the center of the pump, and can reduce vibration and noise; the inlet and outlet flanges can be arranged concentrically, which brings convenience to on-site installation.

[0024] The present invention adopts water-guided bearings to bear axial force and radial force, eliminates bearing bodies and rolling bearings at both ends, eliminates the non-driving end machine seal, retains the driving end machine seal, reduces the bearing force, improves the overall stability and bearing life, reduces the number of machine seals, greatly reduces the cost, improves the overall reliability, and makes maintenance more convenient.

[0025] The present invention is suitable for use in electric fire pumps, diesel fire pumps, heating primary stations, relay stations, primary water supply booster stations, seawater desalination, water treatment and other clean water applications requiring high lift and boosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structural assembly of the compact high-lift double-suction pump of the present invention.

[0027] Figure 2 It is a schematic side view of a compact high-lift double-suction pump of the present invention.

[0028] Figure 3 It is a schematic diagram of the water inlet flow channel of the present invention.

[0029] Figure 4 It is a schematic diagram of the water outlet channel of the present invention.

[0030] Figure 5 It is a schematic diagram of the structure of the present invention before improvement.

[0031] Figure 6 It is a side structural schematic diagram of the present invention.

[0032] Figure 7 It is a front view of the sealing body of the present invention.

[0033] Figure 8 It is a side view of the sealing body of the present invention.

[0034] Fig. 9 It is a three-dimensional diagram of the sealing body of the present invention.

[0035] Fig.10 It is a schematic diagram of the structure of the non-driving side bearing group of the present invention.

[0036] Fig.11 It is a schematic diagram of the structure of the driving side thrust bearing of the present invention.

[0037] Fig.12 It is a schematic diagram of the sealing structure assembly of the present invention.

[0038] The following are the names corresponding to the labels in the present invention:

[0039] Pump body 1, key 2, pin 3, first O-ring 4, sealing body 5, second O-ring 6, bearing end cover 7, round nut 8, thrust bearing 9, first water guide bearing 10, pump cover 11, locking sleeve 12, impeller 13, sealing ring 14, piping 15, second water guide bearing 16, shaft 17, mechanical seal component 18, bolt 19, first washer 20, washer 21, screw tail cone pin 22, nut 23, square head stud 24, stud 25, round head nut 26, second washer 27. DETAILED DESCRIPTION

[0040] Preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0041] Figure 1 This is a schematic diagram of the assembly structure of a compact high-lift double-suction pump according to the present invention. Figure 2 This is a schematic side view of a compact high-lift double-suction pump according to the present invention. Figure 5 This is a schematic diagram of the structure of the present invention before improvement. Figure 6 It is a side structural schematic diagram of the present invention, Fig.10 is a schematic diagram of the structure of the non-driving side bearing group of the present invention, Fig.11FIG. 1 is a schematic diagram of the structure of the driving side thrust bearing of the present invention. Figure 1 , 2 , 5, 6, 10, 11: The present invention relates to a compact high-lift double-suction pump, which adopts an oblique center-open split structure (reference Figure 5 and 6 ), the compact high-lift double-suction pump comprises: a pump body 1, a key 2, a thrust bearing 9, a first water guide bearing 10, a pump cover 11, a locking sleeve 12, an impeller 13, a pipe 15, a second water guide bearing 16, a shaft 17, and a mechanical seal component 18.

[0042] The shaft 17 is connected to the impeller 13 through the key 2, and the locking sleeve 12 is adjustably mounted on the shaft 17. The center position of the hydraulic force is adjusted by the locking sleeve 12, and the sealing body 5 is installed in advance, and then the first water guide bearing 10 and the second water guide bearing 16 are fixed with the thrust bearing 9 to form a complete intermediate rotating structure. The bearing and the sealing body 5 are positioned by the pin 3, and the groove of the sealing body 5 is directly installed on the pump body 1. The pump cover 11 is covered and the bolts and nuts of the oblique middle open surface are tightened. The assembly is completed and connected to the flushing pipe 15 through a flexible joint.

[0043] Put the impeller 13 on the shaft 17, position the circumferential key 2, lock the impeller through the locking sleeve 12 and the step on the shaft, and install the seal 5 (see Figure 7-9 , 12), install the first water guide bearing 10 and the second water guide bearing 16, the first water guide bearing 10, the second water guide bearing 16 and the sealing body 5 are tightly matched, install the pin 3 to position the first water guide bearing 10 and the second water guide bearing 16 and the sealing body 5, then install the thrust bearing 9 at the non-driving end to withstand the axial force brought by the pump, and position the thrust bearing through the round nut 8 and the shaft step; install the impeller sealing ring 14, put the entire rotor component on the pump body 1, put the impeller sealing ring 14 into the center of the pump body, and adjust the relative position of the impeller center and the shell.

[0044] Put the first O-ring 4 into the sealing body 5. There is a slot between the sealing body 5 and the pump body 1. Put the gasket 21 on the pump cover 11. The sealing body 5 and the pump cover are also slotted and sealed with the first O-ring. The pump cover 11 and the pump body 1 are positioned by the screw tail cone pin. The stud 25, the second gasket 27 and the round nut 26 with the middle open face are installed; the bolt 19, the first gasket 20, the mechanical seal component 18 and the bearing end cover 7 are installed, and the assembly is completed. Connect the flushing pipe 15 through the flexible joint; the square head stud 24 is for disassembly.

[0045] The present invention adopts an oblique center-open split structure to separate the water body partition from the pump body. The water body partition is on the sealing body. After the sealing body is installed with the pins aligned, the partition and the pump body form a complete water inlet fluid form. Fig. 9The red box) form is done on the sealing body 5, such as Fig. 9 Three-dimensional illustration of .

[0046] The present invention also relates to a design method for a compact diffusion chamber in a compact structure high-lift double-suction pump, wherein the method optimizes the following structures:

[0047] (1) Optimize the flow channel using a compact diffusion chamber flow channel design method:

[0048] Step (101), optimize the flow field in the semi-spiral suction chamber, while increasing the center position of the inlet and increasing the streamline curvature (see Figure 3 and 4 ), reducing suction loss, thereby improving the pump's anti-cavitation performance; with double-suction symmetrical impellers, the axial force is minimized and high efficiency is achieved in the entire operating range;

[0049] Step (102), aligning the center height of the water outlet with the center height of the water inlet to facilitate on-site pipeline layout;

[0050] Step (103), the partition is located in the middle part, which is convenient for the common use of the sealing bodies on both sides in terms of structure; the angle α between the splitting surface and the center opening line is in the range of 9° to 15°;

[0051] (2) Adopt oblique center-open split structure;

[0052] (3) Adopt water-guided bearing structure and eliminate rolling bearing and bearing body;

[0053] (4) Unique box-type and slot sealing structure.

[0054] The sealing body of the present invention perfectly combines the water absorption flow channel and the sealing component. While ensuring the performance, the box-type sealing body structure ensures that the internal flow channel is not disturbed, and the seal replacement is convenient. Both mechanical seal and packing seal can be used.

[0055] The following is the specific working process of the present invention: during operation, the medium passes through the inlet of the pump body 1, enters the suction chamber inside the pump body 1, reaches the inlet of the impeller 13, and is worked by the impeller 13. The medium flows out along the complete extrusion chamber flow channel formed by the pump body 1 and the pump cover 11, reaches the outlet of the pump body 1 and flows out, completing the medium transportation.

[0056] Since the pump body 1 and the pump cover 11 are axially split, and the split surface passes through the center line of the impeller 13, the internal parts such as the impeller can be inspected and repaired by opening the pump cover 11.

[0057] Furthermore, the present invention adopts an oblique center-open split structure (see Fig. 9), lower the suction height, reduce the cavitation margin, lower the center of the pump, can reduce vibration and noise; the inlet and outlet flanges can be arranged concentrically, which is convenient for on-site installation.

[0058] At the same time, the present invention adopts water-lubricated sliding bearings to bear axial force and radial force, eliminates the bearing bodies and rolling bearings at both ends, eliminates the non-driving end machine seal, retains the driving end machine seal, reduces the bearing force, improves the overall stability and bearing life, reduces the machine seal, greatly reduces the cost, improves the overall reliability, and makes maintenance more convenient.

[0059] The present invention is suitable for use in electric fire pumps, diesel fire pumps, heating primary stations, relay stations, primary water supply booster stations, seawater desalination, water treatment and other clean water applications requiring high lift and boosting.

[0060] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A compact high-lift double-suction pump, characterized in that: The compact high-lift double-suction pump adopts an oblique center-open split structure, and the compact high-lift double-suction pump includes: a pump body, a key, a sealing body, a thrust bearing, a first water guide bearing, a pump cover, a locking sleeve, an impeller, a second water guide bearing, a shaft, and a mechanical seal component; The thrust bearing and the first water-guided bearing are located on the non-driving side, and the second water-guided bearing is located on the driving side. The sealing body on the non-driving side is located between the pump body, the bearing end cover, the thrust bearing, and the first water-guided bearing, and the sealing body on the driving side is located between the pump body and the second water-guided bearing; The shaft is connected to the impeller through a key, and the locking sleeve is located on the non-driving side. The locking sleeve is adjustably mounted on the shaft. The hydraulic center position is adjusted through the locking sleeve, and the sealing body is installed. Then, it is fixed in combination with the first water guide bearing, the second water guide bearing, and the thrust bearing to form a complete intermediate rotating structure.

2. The compact high-lift double-suction pump according to claim 1 is characterized in that: The bearing and the sealing body are positioned by pins, the bayonet of the sealing body is directly installed on the slot of the pump body, the pump cover is put on and the bolts and nuts with the oblique center open surface are tightened, and the assembly is completed, and the internal flushing pipe is connected through a flexible joint.

3. The compact high-lift double-suction pump according to claim 1 is characterized in that: Put the impeller on the shaft, position it with the circumferential direction key, lock the impeller with the locking sleeve and the step on the shaft, install the sealing body, install the first water-guide bearing and the second water-guide bearing, the first water-guide bearing, the second water-guide bearing and the sealing body are tightly matched, install the pins to position the first water-guide bearing and the second water-guide bearing with the sealing body, then install the thrust bearing on the non-driving end to withstand the axial force brought by the pump, and position the thrust bearing with the round nut and the shaft step; install the impeller sealing ring, put the entire rotor component on the pump body, put the impeller sealing ring into the center of the pump body, and adjust the relative position of the impeller center and the casing.

4. The compact high-lift double-suction pump according to claim 1 is characterized in that: The compact high-lift double-suction pump further comprises internal flushing pipes installed on both the driving side and the non-driving side, and the two ends of the internal flushing pipes are respectively installed on the pump cover and the pump body.

5. The compact high-lift double-suction pump according to claim 1 is characterized in that: Put the first O-ring into the sealing body. There is a groove between the sealing body and the pump body. Put the gasket on the pump cover. The sealing body and the pump cover are also positioned in the groove. At the same time, there is a first O-ring seal. The pump cover and the pump body are positioned by the screw tail cone pin. Install the double-headed studs with a center open surface, the second gasket and the round head nut; tighten the bolts, the first gasket, install the mechanical seal components and the bearing end cover, and the assembly is completed; connect the flushing pipe through the flexible joint; the square head studs are for disassembly.

6. The compact high-lift double-suction pump according to claim 1 is characterized in that: The oblique center-open split structure is adopted to separate the water body partition part from the pump body.

7. The compact high-lift double-suction pump according to claim 1 is characterized in that: The water body baffle is on the sealing body. After the sealing body is installed with the pins aligned, the water body baffle and the pump body form a complete water inlet fluid form.

8. A method for designing a compact diffusion chamber in a compact structure high-lift double-suction pump as claimed in claims 1 to 7, characterized in that: The method optimizes the following structures: (1) Optimize the flow channel using a compact diffusion chamber flow channel design method: Step (101), optimizing the flow field in the semi-spiral suction chamber, increasing the streamline curvature while improving the inlet center position, reducing suction loss, thereby improving the anti-cavitation performance of the pump; and using a double-suction symmetrical impeller to minimize the axial force and achieve high efficiency in the entire operating range; Step (102), align the center height of the water outlet with the center height of the water inlet to facilitate on-site pipeline layout, Step (103), the partition is located in the middle part, which is convenient for the common use of the sealing bodies on both sides in terms of structure; the angle α between the splitting surface and the center opening line is in the range of 9° to 15°; (2) Adopt oblique center-open split structure; (3) Adopt water-guided bearing structure and eliminate rolling bearing and bearing body; (4) The slot sealing structure in the sealing body.

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