CN203214403U - Multi-stage radial split petrochemical process pump - Google Patents

Abstract

The utility model provides a multi-stage radially split petrochemical process pump, which comprises a pump body, a suction end pump cover and a discharge end pump cover arranged at both ends of the pump body, and a pump shaft arranged in the pump body; the pump body An impeller cavity is formed between the pump cover at the suction end and the pump cover at the discharge end; the impeller cavity is sequentially provided with a first-stage water absorption chamber, a second-stage water absorption chamber and a third-stage water absorption chamber along the direction in which the pump shaft extends; The primary water-absorbing chamber is provided with a primary impeller, the secondary water-absorbing chamber is provided with a second-stage impeller, and the tertiary water-absorbing chamber is provided with a third-stage impeller; the primary water-absorbing chamber communicates with the suction port of the pump body, The first-stage suction chamber communicates with the discharge port of the pump body; the second-stage impeller and the third-stage impeller are installed back to back; the outer diameters of the first-stage impeller, the second-stage impeller, and the third-stage impeller are different. The utility model adopts the design of three impellers with different outer diameters, which makes the structural installation inside the pump body more convenient.

Description

Multi-stage radial split petrochemical process pump

technical field

The utility model belongs to the field of petrochemical process pumps, in particular to a multi-stage radial split petrochemical process pump.

Background technique

With the rapid growth of domestic construction, petroleum, petrochemical and environmental protection markets, China's pump industry has ushered in a strong vitality. It can be said that China's continuously growing market space will surely bring spring to China's pump industry. As far as the petrochemical industry is concerned, the processing capacity of a single set of equipment in my country's oil refineries was generally about 5 million tons per year before 2003. The scale of 10,000 tons/year is mainly for oil refining devices, and even super-large devices of 20 million tons/year. In addition, during the "Twelfth Five-Year Plan" period, my country will successively build a number of large-scale oil refining projects with an annual output of more than 10 million tons, large-scale ethylene with an annual output of more than 1 million tons, and large-scale PTA projects with an annual output of more than 1 million tons. , will inevitably lead to the enlargement of the equipment of the downstream project, and the enlargement of the installation will inevitably require the enlargement of the corresponding supporting equipment. As far as the pump is concerned, it requires greater flow, higher head, and greater shaft power. The multi-stage radially split petrochemical process pump (WD type pump) was successfully developed under this requirement. The WD type pump is mainly an extension of the head of the BB2 pump type single-stage or 2-stage pump. For single-stage or two-stage pumps in the form of BB2, in order to increase the head, the outer diameter of the impeller must be increased. However, increasing the outer diameter of the impeller will reduce the efficiency of the pump, and the radial dimension of the pump body will increase, which will bring problems for casting. difficulty. Therefore, a second-stage pump is added on the basis of the second-stage pump, but the WD-type pumps currently on the market generally have complex structures and are difficult to cast and install.

Utility model content

The utility model aims at the deficiencies of the above-mentioned prior art, and provides a multi-stage radial split petrochemical process pump with simple structure, convenient installation and small casting difficulty.

The utility model is achieved through the following technical solutions:

A multi-stage radially split petrochemical process pump, comprising a pump body, a suction end pump cover and a discharge end pump cover arranged at both ends of the pump body, and a pump shaft arranged in the pump body; the pump body and the suction end pump cover An impeller cavity is formed between the pump cover and the discharge end; both ends of the pump shaft are provided with bearing bodies and bearing brackets;

It is characterized in that a first-stage water absorption chamber, a second-stage water absorption chamber and a third-stage water absorption chamber are sequentially arranged in the impeller chamber along the direction in which the pump shaft extends; the first-stage water absorption chamber is provided with a first-stage impeller, The second-stage impeller is arranged in the second-stage water-absorbing chamber, and the third-stage impeller is arranged in the third-stage water-absorbing chamber; the first-stage water-absorbing chamber communicates with the suction port of the pump body, and the third-stage water-absorbing chamber communicates with the discharge port of the pump body; Stage impellers are mounted back-to-back with third stage impellers; first, second and third stage impellers have different outer diameters.

The further setting of the utility model is that the first-level water absorption chamber and the second-level water absorption chamber are connected through a double flow channel, and the second-level water absorption chamber and the third-level water absorption chamber are connected through a single flow channel.

The further configuration of the present utility model is that an intermediate partition is arranged between the secondary water absorption chamber and the tertiary water absorption chamber, and the intermediate partition is connected to the pump body through bolts.

The further setting of the utility model is that the first-stage impeller, the second-stage impeller and the third-stage impeller are all provided with impeller mouth rings at the joints of the pump body, and the impeller mouth rings are provided with spiral grooves.

The further setting of the utility model is that the pump shaft is provided with a first ring groove, and the first split and half snap ring is arranged in the first ring groove; the first stage fixed distance bushing is set on the pump shaft; the first stage fixed distance One end of the shaft sleeve abuts against the first half snap ring, and the other end abuts against the first-stage impeller; a first snap ring sleeve is installed outside the first half snap ring.

The further setting of the utility model is that the pump shaft is provided with a second annular groove, and the second half snap ring is arranged in the second annular groove; the final stage fixed distance bushing is set on the pump shaft; the final stage fixed distance One end of the shaft sleeve abuts against the second half snap ring, and the other end abuts against the third-stage impeller; a second snap ring sleeve is installed outside the second half snap ring; There is a spiral groove; a throat bushing is set between the final stage distance bushing and the pump cover at the discharge end, and a plurality of pressure relief holes connected with the balance pipe are set on the throat bushing.

The further setting of the utility model is that the sizes of the two impeller mouth rings arranged on both sides of the first-stage impeller are different, and the size of the impeller mouth ring at the non-driving end is smaller than the size of the impeller mouth ring at the driving end; The impeller lip rings are the same size on both sides of the impeller.

The further setting of the present utility model is that a wrapped water-cooling jacket is arranged in the bearing body.

Compared with the prior art, the multi-stage radial split petrochemical process pump described in the utility model has the following beneficial effects:

1. The utility model adopts the design of three impellers with different outer diameters, which makes the structure installation inside the pump body more convenient.

2. The utility model improves the connection mode between the intermediate partition and the pump body, that is, it is installed with bolts; compared with the traditional long column or long pin connection mode, or the connection mode of bolts and compression plates, the structure of the utility model Easier and easier to install.

3. In the utility model, the outlet of the second-stage impeller to the inlet of the third-stage impeller adopts a single channel, which can make the appearance of the pump body beautiful and generous, and the hydraulic performance does not deteriorate, which improves the casting quality of the pump body and makes the casting more efficient. Simple.

4. The impeller mouth ring in the utility model adopts a spiral groove structure design, which can reduce the leakage between stages and improve the efficiency of the pump.

5. In the utility model, the first-stage positioning shaft sleeve adopts the design of split-half snap ring, so that the axial force generated by the first-stage impeller can be transmitted to the pump shaft by split-half snap ring, and at the same time play a thrust role; different from the traditional Compared with structures such as gasket retaining sleeves, the intensity of the utility model is higher.

6. In the utility model, the non-driving end fixed distance bushing (that is, the last stage fixed distance bushing) adopts a spiral groove design, and the throat bushing adopts the form of a multi-hole pressure relief connection balance pipe, and the fixed distance bushing adopts The thrust of the snap ring is divided into half, so that the axial force generated by the impeller is transmitted to the pump shaft, which can further reduce the pressure in the sealing chamber of the non-driving end.

7. In the utility model, the impeller mouth rings on both sides of the first-stage impeller are designed to be of different sizes, that is, the impeller mouth ring on the thrust bearing side is slightly smaller than the other side, and the impeller mouths of the second-stage impeller and the third-stage impeller The size of the rings is the same, so that the pump can generate a slight axial force, let the shaft work under tension, and can effectively avoid the left and right movement of the rotor.

8. The bearing body in this utility model adopts the cooling method of wrapped water-cooled jacket, which can cool the bearing body to the maximum extent, reduce the heat generated during the operation of the bearing, and improve the service life of the bearing.

Description of drawings

Fig. 1 is the structural diagram of the multi-stage radial split petrochemical process pump described in the utility model;

Figure 2 is a structural diagram of the connection of the intermediate partition;

Figure 3 is a structural diagram of the connection of the impeller mouth ring;

Fig. 4 is a structural diagram of the connection of the first stage distance bushing;

Fig. 5 is a structural diagram of the connection of the last stage distance bushing;

The meanings of the symbols in the figure are as follows:

Pump body 1, suction end pump cover 2, discharge end pump cover 3, first stage impeller 4, second stage impeller 5, third stage impeller 6, impeller mouth ring 7, pump shaft 8, first stage distance bushing 9, Final stage fixed distance shaft sleeve 10, bearing body 11, bearing bracket 12, intermediate partition plate 13, throat bushing 14, first snap ring sleeve 15, first split and half snap ring 16, second snap ring sleeve 17, Second half snap ring 18, suction port 19, discharge port 20, pump body mouth ring 21, bolt 22.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

The utility model provides a multi-stage radial split petrochemical process pump, which is supported by a center line, so that when the temperature rises, it can be well centered and reduce the pipeline load. The pump is a three-stage centrifugal structure supported at both ends, and its overall design complies with the tenth edition of the API610 standard. The pump is supported by the center line and radially split. The design maximum operating temperature is 450°C and the standard maximum operating pressure is 10.0Mpa. The direction of the pump inlet and outlet is upward and upward, reducing the equipment space. The pump has a large suction area and good cavitation performance. The shaft seal can be mechanical seal or stuffing seal. The pump transmission adopts a diaphragm coupling with an intermediate extension, and the pump bearing or mechanical seal can be repaired without moving the motor and disassembling the pump inlet and outlet pipelines. The coupling is equipped with an open non-sparking type protective cover.

In the multi-stage radial split petrochemical process pump described in the utility model, in order to reduce NPSH, the first-stage impeller adopts double suction, and the second-stage and third-stage impellers are single-suction. Specifically, as shown in Figure 1, it includes a pump body 1, a suction end pump cover 2 arranged at both ends of the pump body 1, a pump cover 3 at the discharge end and a pump shaft 8 arranged in the pump body 1; the pump body 1 An impeller cavity is formed between the pump cover 2 at the suction end and the pump cover 3 at the discharge end; the two ends of the pump shaft 8 are provided with a bearing body 11 and a bearing bracket 12 . The bearing bracket 12 adopts a full circle design, which can improve the connection strength of the bearing body 11 and reduce the vibration of the bearing body 11 . The radial bearing of the pump adopts cylindrical roller bearings, the thrust bearing adopts back-to-back installed thrust roller bearings, the bearing adopts the self-lubricating method of oil throwing ring, and the bearing body 11 adopts jacket water cooling method for cooling. It can also be equipped with sliding bearings or forced lubrication structures according to specific conditions.

The impeller cavity is provided with a first-stage water absorption chamber, a second-stage water absorption chamber and a third-stage water absorption chamber in sequence along the direction in which the pump shaft 8 extends; the first-stage water absorption chamber is provided with a first-stage impeller 4, a second-stage The second-stage impeller 5 is arranged in the water-absorbing chamber, and the third-stage impeller 6 is arranged in the third-stage water-absorbing chamber; Connected; the outer diameters of the first-stage impeller 4, the second-stage impeller 5 and the third-stage impeller 6 are different, so that the installation of the internal structure of the pump can be more convenient.

The self-balancing structure in which the second stage impeller 5 and the third stage impeller 6 are installed back to back is used to reduce the axial force and reduce the pressure of the secondary sealing chamber.

The primary suction chamber and the secondary suction chamber are connected through double channels. Part of the flow channels of the double channel suction chamber are designed on the pump body, and part of the flow channels are designed on the pump cover. Between the secondary suction chamber and the third suction chamber communicated through a single flow channel. Among them, both the double-channel and the single-channel adopt a space distortion structure, which not only has a compact structure, but also has a beautiful appearance.

As shown in FIG. 2 , an intermediate partition 13 is arranged between the secondary water absorption chamber and the tertiary water absorption chamber, and the intermediate partition 13 is connected to the pump body 1 by bolts 22 , which makes installation more convenient.

The joints of the first stage impeller 4, the second stage impeller 5 and the third stage impeller 6 and the pump body 1 are provided with an impeller mouth ring 7 and a pump body mouth ring 21, and the impeller mouth ring 7 is provided with a spiral groove (such as Figure 3). Such setting can reduce liquid leakage and improve pump efficiency. Preferably, the sizes of the two impeller rings 7 arranged on both sides of the first-stage impeller 4 are different, and the size of the impeller ring at the non-driving end is smaller than the size of the impeller ring at the driving end; The impeller mouth rings 7 on both sides have the same size. This allows the shaft to work under tension, effectively avoiding the left and right movement of the rotor.

As shown in Figure 4, the pump shaft 8 is provided with a first ring groove, and the first split ring 16 is arranged in the first ring groove; the first stage distance bushing 9 is set on the pump shaft 8; the first stage One end of the spacer sleeve 9 abuts against the first half snap ring 16 , and the other end abuts against the first-stage impeller 4 ; the first half snap ring 16 is equipped with a first snap ring sleeve 15 . As shown in Figure 5, a second annular groove is provided on the pump shaft 8, and a second half snap ring 18 is arranged in the second annular groove; the final stage distance bushing 10 is set on the pump shaft 8; the final stage One end of the spacer bushing 10 abuts against the second half snap ring 18, and the other end abuts against the third-stage impeller 6; the second half snap ring 18 is equipped with a second snap ring sleeve 17; A spiral groove is provided on the first-stage distance bushing 10; a throat bushing 14 is arranged between the last-stage distance bushing 10 and the pump cover 3 at the discharge end, and a plurality of throat bushings 14 are provided with Pressure relief hole for balance pipe connection.

The above are preferred embodiments of the utility model, and all equivalent changes made according to the patent scope of the utility model shall belong to the protection scope of the utility model.

Claims (8)

1. multistage radially subdivision petrochemical process pump comprises the pump housing (1), is arranged at the suction cover (2) at the pump housing (1) two ends and the end pump cover (3) that spues, is arranged at the pump shaft (8) in the pump housing (1); The described pump housing (1) and suction cover (2) and formation one impeller cavity between the end pump cover (3) that spues; The two ends of pump shaft (8) are provided with bearing support (11) and bearing bracket (12);

It is characterized in that the direction that stretches into along pump shaft (8) in the described impeller cavity is disposed with chopped-off head suction chamber, secondary suction chamber and the three grades of suction chambers that are connected; Be provided with first stage impeller (4) in the described chopped-off head suction chamber, be provided with second level impeller (5) in the secondary suction chamber, be provided with third level impeller (6) in three grades of suction chambers; The chopped-off head suction chamber is communicated with the suction port (19) of the pump housing (1), and three grades of suction chambers are communicated with the discharge opening (20) of the pump housing (1); Second level impeller (5) is installed back-to-back with third level impeller (6); The external diameter of first stage impeller (4), second level impeller (5) and third level impeller (6) has nothing in common with each other.

2. multistage radially subdivision petrochemical process pump according to claim 1 is characterized in that, is communicated with by double flow channel between chopped-off head suction chamber and the secondary suction chamber, is communicated with by single channel between secondary suction chamber and the three grades of suction chambers.

3. multistage radially subdivision petrochemical process pump according to claim 1 is characterized in that, is provided with intermediate clapboard (13) between secondary suction chamber and three grades of suction chambers, and described intermediate clapboard (13) is connected by bolt (22) with the pump housing (1).

4. multistage radially subdivision petrochemical process pump according to claim 1, it is characterized in that, first stage impeller (4), second level impeller (5) and third level impeller (6) are provided with impeller port ring (7) with the cooperation place of the pump housing, and described impeller port ring (7) is provided with spiral chute.

5. multistage radially subdivision petrochemical process pump according to claim 1 is characterized in that pump shaft (8) is provided with first annular groove, is provided with first fen half snap ring (16) in described first annular groove; Be set with chopped-off head distance bush (9) on the pump shaft (8); One end of chopped-off head distance bush (9) and first fen half snap ring (16) butt, the other end and first stage impeller (4) butt; First minute half snap ring (16) the outside the first snap ring cover (15) is housed.

6. multistage radially subdivision petrochemical process pump according to claim 1 is characterized in that pump shaft (8) is provided with second annular groove, is provided with second fen half snap ring (18) in described second annular groove; Be set with final stage distance bush (10) on the pump shaft (8); One end of final stage distance bush (10) and second fen half snap ring (18) butt, the other end and third level impeller (6) butt; Second minute half snap ring (18) the outside the second snap ring cover (17) is housed; Described final stage distance bush (10) is provided with spiral chute; Described final stage distance bush (10) and spue and be provided with throat's lining (14) between end pump cover (3), described throat lining (14) is provided with a plurality of relief holes that are connected with balance tube.

7. multistage radially subdivision petrochemical process pump according to claim 1, it is characterized in that, be arranged at the size difference of two impeller port rings (7) of first stage impeller (4) both sides, the impeller port ring size of anti-drive end is less than the impeller port ring size of drive end; Be arranged at impeller port ring (7) measure-alike of second level impeller (5) and third level impeller (6) both sides.

8. multistage radially subdivision petrochemical process pump according to claim 1 is characterized in that described bearing support is provided with the bundling type water-cooling jacket in (11).

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