CN203214340U - Double-shell symmetric radially-split multistage centrifugal pump - Google Patents

Abstract

The utility model provides a double-shell symmetrical radially split multi-stage centrifugal pump, which includes an outer shell and a core pack assembly; the core pack assembly includes a pump shaft, an inner shell, and two pumps arranged in the inner shell. Each impeller assembly includes a plurality of impellers and a plurality of guide vanes sleeved on the pump shaft; the two impeller assemblies rotate in opposite directions and are arranged back-to-back on the suction side and discharge side of the pump. The utility model can realize the self-balancing of axial force by arranging two impeller assemblies back to back; it has the characteristics of reasonable and reliable structure, high efficiency and energy saving; it can be widely used in petroleum, petrochemical, chemical, electric power, smelting and other industries.

Description

Double casing symmetrical radially split multistage centrifugal pump

technical field

The utility model belongs to the field of centrifugal pumps, in particular to a double-housing symmetrical radial split multistage centrifugal pump.

Background technique

In a centrifugal pump, the flowing medium (gas and liquid, or a mixture of suspended particles and gas or liquid) enters from the root of the blade shaft (inlet), and the medium relies on high-speed rotating blades to obtain centrifugal force, which generates a high pressure, and flows from the pressure relief port (outlet) Outgoing media conveying equipment. A multi-stage centrifugal pump is a combination of two or more pumps with the same function. In terms of the fluid channel structure, the medium pressure relief port of the first stage communicates with the inlet of the second stage, and the medium pressure relief port of the second stage communicates with the inlet of the second stage. It communicates with the inlet of the third stage, and the mechanism in series in this way forms a multistage centrifugal pump. The significance of the multistage centrifugal pump is to increase the set pressure.

At present, the multistage centrifugal pumps used in various occasions will generate a large axial force during use. Because when the impeller is working, an axial force will be generated on the impeller, especially the more the number of impellers of the multistage centrifugal pump, the more serious the axial force will be.

Utility model content

The utility model aims at the deficiencies of the above-mentioned prior art, and provides a double-shell symmetrical radially split multistage centrifugal pump capable of self-balancing axial force.

The utility model is achieved through the following technical solutions:

A double casing symmetrical radially split multistage centrifugal pump, comprising an outer casing and a core package assembly; the core package assembly includes a pump shaft, an inner casing, and two impeller assemblies arranged in the inner casing, each Each impeller assembly includes multiple impellers and multiple guide vanes sleeved on the pump shaft; the two impeller assemblies rotate in opposite directions and are arranged back-to-back on the suction side and discharge side of the pump.

The further arrangement of the present utility model is that the outer casing includes an outer cylinder body, a front pump cover, a rear pump cover and a tail cover, and the front pump cover and the rear pump cover are sealed and fixedly installed at both ends of the outer cylinder body; The rear pump cover is fixedly connected; the front pump cover is integrally provided with a first bearing bracket; the tail cover is integrally provided with a second bearing bracket.

The utility model is further provided that the pump shaft is installed in the housing through two bearing bodies; the bearing body is a self-lubricating bearing body or a forced-lubricating bearing body; the self-lubricating bearing body includes a bearing bush and a set of horns Contact ball bearing; the forced lubrication bearing body includes a bearing pad and a set of pad type thrust bearings.

The further setting of the present utility model is that the inner casing includes the first middle section, the first middle section, the middle guide body, the reverse guide body, the second middle section and the last middle section connected in sequence, and the last middle section communicates with the middle guide body, The intermediate guide body communicates with the discharge chamber of the centrifugal pump.

A further setting of the present utility model is that a tap structure is provided on the middle section of the final stage.

The further setting of the utility model is that the pump shaft is provided with an intermediate guide body bush and a balance bush, the intermediate guide body bush is fixedly connected with the intermediate guide body, and the balance bush is fixedly connected with the outer cylinder , a labyrinth structure is arranged in the inner holes of the intermediate diverter bushing and the balance bushing.

A further setting of the present invention is that a core pack adjustment pad is provided between the core pack assembly and the outer shell, and the core pack adjustment pad is a flat gasket.

The further setting of the utility model is that the middle section of the final stage and the intermediate guide body are statically sealed by an O-ring, and the two are connected by a cylindrical pin.

A further setting of the present utility model is that the core pack assembly is connected together by a long stud and a nut.

The double-shell symmetrical radially split multistage centrifugal pump (TDFB series pump) described in the utility model has the following beneficial effects:

1. There are two sets of impellers on the suction side and the discharge side of the pump. Seen from the suction side of the impellers, the two sets of impellers rotate in opposite directions and are arranged back to back, so that the axial force can be self-balanced. It has the characteristics of reasonable and reliable structure, high efficiency and energy saving; it can be widely used in petroleum, petrochemical, chemical, electric power, smelting and other industries.

2. The front pump cover on the suction side, the tail cover and the bearing body bracket are designed in one piece, which can reduce the axial dimension and make the structure compact.

3. The bearing body is a center-opening, full-circle connection structure; it can be self-lubricated or forced-lubricated, which is easy to install and use.

4. The middle section of the first stage in the inner shell has a tap structure, which can be used for self-flushing or as the suction port of other pumps.

5. The inner hole of the intermediate diverter bushing and balance bushing is designed as a labyrinth structure, which has a better effect.

6. The core pack adjustment pad is designed as a flat gasket, and is designed with an expansion gap for higher temperature conditions; compared with the spring or winding pad in the prior art, the structure is simpler and the effect is better.

7. The static seal between the middle section of the final stage and the intermediate guide body is sealed by an O-ring seal, and the two are prevented from relative rotation through a cylindrical pin; compared with the prior art, the utility model has no bolt connection, which can better meet the requirements of the pump when it is running. structural stress requirements.

8. Use extended long studs and nuts to connect the core package as a whole, that is, the long studs pass through the middle section of the final stage and connect the middle guide body, which can facilitate the disassembly and assembly of the core package components.

Description of drawings

Fig. 1 is the structural diagram of the dual-housing symmetrical radially split multistage centrifugal pump described in the present invention;

Figure 2 is a structural diagram of a self-lubricating bearing body;

Figure 3 is a structural diagram of the forced lubrication bearing body;

Fig. 4 is a labyrinth structural diagram of the inner hole of the balance bush;

In the figure: pump shaft 1, bearing body 2, front pump cover 3, first stage middle section 4, first stage impeller 5, first stage guide vane 6, first middle section 7, secondary impeller 8, last stage guide vane 9, middle guide Fluid 10, intermediate diverter bushing 11, reverse diverter 12, cartridge adjustment pad 13, rear pump cover 14, tail cap 15, balance bush 16, second middle section 17, final stage middle section 18, outer cylinder 19, Long stud 20.

Detailed ways

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

The dual-housing symmetrical radially split multistage centrifugal pump (TDFB series pump) described in the utility model is a structure with multistage, cylindrical, segmental inner casing and back-to-back arrangement of impellers. As shown in Figure 1, it includes an outer casing and a core package assembly; the core package assembly includes a pump shaft 1 and an inner casing, and two impeller assemblies arranged in the inner casing, and each impeller assembly includes a pump sleeve Multiple impellers and multiple guide vanes on shaft 1; the two impeller assemblies rotate in opposite directions and are arranged back-to-back on the suction and discharge sides of the pump. The core pack assembly can be removed from the housing as a whole or put into the housing. The centrifugal pump has two sets of impellers arranged back to back, which can realize the self-balancing of axial force; by adjusting the diameter of the balance sleeve through design, the number of impellers in the two impeller assemblies can be the same or different (when the total number of impellers is odd). The impeller of the pump is in clearance fit with the pump shaft 1, and the impeller is positioned step by step on the pump shaft 1. In this embodiment, viewed from the shaft extension end of the pump, the rotation of the pump is clockwise (it can also be designed to rotate counterclockwise), that is, a set of impellers on the suction side is clockwise, and a set of impellers on the discharge side is counterclockwise. The hour hand rotates. The fluid conveyed by the impeller is pressure recovered through the guide vane and guided to the inlet of the next stage impeller, and finally flows out of the pump through the discharge port.

The outer casing includes an outer cylinder body 19, a front pump cover 3, a rear pump cover 14 and a tail cover 15, and the front pump cover 3 and the rear pump cover 14 are all sealed and fixedly installed on the two ends of the outer cylinder body 19; The rear pump cover 14 is fixed; the front pump cover 3 is integrally provided with a first bearing bracket; the tail cover 15 is integrally provided with a second bearing bracket. Among them, the outer shell is a cylindrical and forging structure, and the support mode of the outer shell is horizontal support of the center line, and can also be designed as a foot support. Suction and discharge flanges are arranged on the outer shell, and the suction and discharge flanges are arranged vertically upward, and can also be designed to be arranged horizontally.

The inner casing includes the first middle section 4, the first middle section 7, the middle guide body 10, the reverse guide body 26, the second middle section 17 and the last middle section 18 connected in sequence, and the last middle section 18 communicates with the middle guide body 10, The intermediate guide body 10 communicates with the discharge chamber of the centrifugal pump; the middle section 18 of the final stage is provided with a tap structure. The inner casing is a segmental structure, and is divided into two groups corresponding to the impeller, which are respectively tightened and fixed with tension bolts. The transition channels on the intermediate guide body 10 are all completed by material removal processing to ensure that the surface of the channels has a high degree of smoothness.

The pump shaft 1 is installed in the housing through two bearing bodies 2; the bearing body 2 is a self-lubricating bearing body or a forced-lubricating bearing body; the self-lubricating bearing body includes a bearing bush and a set of angular contact ball bearings (such as As shown in Figure 2); the forced lubrication bearing body includes a bearing pad and a set of pad-type thrust bearings (as shown in Figure 3). The shaft seal of the pump is a mechanical seal, and the seal type and the corresponding flushing scheme are selected according to the specific medium and service conditions. The radial bearings of the pump are sliding bearings. The thrust bearing is a set of back-to-back angular contact ball bearings or a set of thrust sliding bearings. The matching and lubrication method of the bearing should be selected according to the specific power, speed and other conditions. The material of the overcurrent parts and components in the pump can be selected according to the specific medium working conditions.

The pump shaft 1 is provided with an intermediate guide body bush 11 and a balance bush 16, the intermediate guide body bush 11 is fixedly connected with the intermediate guide body 10, the balance bush 16 is fixedly connected with the outer cylinder 19, A labyrinth structure (as shown in FIG. 4 ) is provided in the inner holes of the intermediate guide fluid bushing 11 and the balance bushing 16 .

A core package adjustment pad 13 is arranged between the core package assembly and the outer shell, and the core package adjustment pad 13 is a flat gasket. The middle section 18 of the final stage and the intermediate guide body 10 are statically sealed by an O-ring, and the two are prevented from relative rotation by cylindrical pins, and are connected without bolts to meet the structural stress requirements during pump operation.

In order to facilitate the assembly and disassembly of the core package, the core package assembly is connected as a whole by using extended long studs 20 and nuts (that is, the long studs 20 pass through the middle section 18 of the final stage and connect with the intermediate guide body 10 ).

The operating principle of the centrifugal pump described in the utility model is as follows:

The fluid medium enters the suction chamber formed by the front pump cover 3, the outer cylinder 19 and the first-stage middle section 4 through the suction port on the outer cylinder 19, and is sucked by the first-stage impeller 5 and thrown out, and flows through the first-stage guide vane 6 Enter the secondary impeller 8, until the last stage impeller and guide vane in the first group are exported, pass through the intermediate guide body 10, the long flow channel flows into the reverse guide fluid 12, and then enter the first stage impeller in the second impeller assembly , the fluid thrown out from the impeller enters the impeller of the next stage through the guide vane, until the impeller of the last stage and the guide vane 9 of the last stage, and finally is introduced into the discharge chamber by the intermediate guide body 10, and then passes through the discharge chamber communicated with the discharge chamber. The discharge port flows into the discharge piping system.

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 (9)

1. bivalve body symmetric type subdivision multistage centrifugal pump radially is characterized in that, comprises frame and core pack assembly; Described core pack assembly comprises pump shaft (1) and inner housing, and is arranged on two impeller assemblies in the inner housing, and each impeller assembly includes a plurality of impellers and a plurality of stator that is enclosed within on the pump shaft; Opposite, back-to-back suction side and the exhaust end that is arranged in pump of the sense of rotation of two impeller assemblies.

2. bivalve according to claim 1 body symmetric type subdivision multistage centrifugal pump radially, it is characterized in that, described frame comprises outer cylinder body (19), front pump cover (3), rear pump cover (14) and tail-hood (15), and the equal sealing and fixing of front pump cover (3) and rear pump cover (14) is installed on the two ends of outer cylinder body (19); Tail-hood (15) is connected with rear pump cover (14); Described front pump cover (3) is gone up integrated setting clutch shaft bearing body carriage; Described tail-hood (15) is gone up integrated setting the second bearing support carriage.

3. body symmetric type subdivision multistage centrifugal pump radially in bivalve according to claim 1 is characterized in that described pump shaft (1) is installed in the frame by two bearing suppories (2); Described bearing support (2) is a self oiling bearing body or forced-lubrication bearing body; Described self oiling bearing body comprises bearing shell and one group of angular contact ball bearing; Described forced-lubrication bearing body comprises bearing shell and one group of tile fragment formula thrust-bearing.

4. bivalve according to claim 2 body symmetric type subdivision multistage centrifugal pump radially, it is characterized in that, described inner housing comprises chopped-off head stage casing (4), first stage casing (7), middle deflector (10), reverse deflector (26), second stage casing (17) and final stage stage casing (18) that are communicated with successively, final stage stage casing (18) communicates with middle deflector (10), and middle deflector (10) communicates with the chamber of spuing of centrifugal pump.

5. body symmetric type subdivision multistage centrifugal pump radially in bivalve according to claim 4 is characterized in that described final stage stage casing (18) is provided with tap structure.

6. bivalve according to claim 4 body symmetric type subdivision multistage centrifugal pump radially, it is characterized in that, deflector lining (11) and balance bush (16) in the middle of described pump shaft (1) is provided with, deflector lining (11) is connected with middle deflector (10) in the middle of described, described balance bush (16) is connected with outer cylinder body (19), is provided with a maze-type structure in the endoporus of described middle deflector lining (11) and balance bush (16).

7. body symmetric type subdivision multistage centrifugal pump radially in bivalve according to claim 1 is characterized in that be provided with a core bag spacer (13) between described core pack assembly and the frame, described core bag spacer (13) is a flat gasket.

8. body symmetric type subdivision multistage centrifugal pump radially in bivalve according to claim 4 is characterized in that adopt O RunddichtringO static seal between described final stage stage casing (18) and the middle deflector (10), both connect by straight pin.

9. body symmetric type subdivision multistage centrifugal pump radially in bivalve according to claim 1 is characterized in that described core pack assembly links together by a long threaded rod (20) and nut.

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