CN209638077U - High-performance guide-vane single-stage cantilever centrifugal pump - Google Patents

Abstract

The utility model discloses a high-performance guide vane type single-stage cantilever centrifugal pump, which comprises a casing and an inlet and an outlet arranged on the casing. A liquid chamber, the casing is provided with a through rotating shaft, and the rotating shaft is fixed with a double-suction impeller and a single-suction secondary impeller. Along the axis direction of the double-suction impeller and the single-suction secondary impeller, the double-suction The distance between the vane top surface of the impeller and the single-suction secondary impeller and the inner wall of the housing is the blade tip clearance, and the distance between the double-suction impeller and the single-suction secondary impeller and the inner wall of the housing is set There are guide vanes to control the size of the tip clearance. The beneficial effects of the utility model are mainly reflected in: simple structure, exquisite design, easy assembly by adopting the adjustable blade tip clearance structure, realizing adjustable pump performance, meeting the performance requirements of different engines for turbo pumps, and significantly improving product performance adaptability .

Description

High-performance guide vane single-stage cantilever centrifugal pump

technical field

The utility model relates to pumps, in particular to a high-performance guide vane type single-stage cantilever centrifugal pump.

Background technique

As the main power-consuming equipment in petrochemical, metallurgical and electric power industries, centrifugal pumps are widely used in various fields of national economy. As the requirements for energy saving and emission reduction become higher and higher, centrifugal pumps are also constantly developing in the direction of high performance and low energy consumption.

Centrifugal pumps have various forms such as vertical, horizontal, single-stage, multi-stage, single-suction, double-suction, and self-priming. Centrifugal pumps work by rotating the impeller to cause the water to move centrifugally. Before starting the pump, the pump casing and the suction pipe must be filled with water, and then the motor is started to drive the impeller and the water to rotate at a high speed. The water undergoes centrifugal motion and is thrown to the outer edge of the impeller, and flows through the volute pump casing. The pressure water pipeline flowing into the water pump.

For example, the authorized notification number CN206246410U discloses a centrifugal pump with a double-suction impeller, including a casing and an inlet and an outlet arranged on the casing, and the inlet and the outlet are located on the same side of the casing, the The housing is provided with a through rotating shaft, and a double-suction impeller is fixed on the rotating shaft. The housing is also provided with a first suction chamber, a second suction chamber and an outflow chamber. The first suction chamber, the second suction chamber It is located on both sides of the double-suction impeller and has a symmetrical structure. The first suction chamber and the second suction chamber are also connected with the inlet and the outflow chamber; a single-suction secondary is also fixed on the shaft. The impeller, the housing is also provided with a liquid flow channel and a flow pipe, the liquid flow channel is located on one side of the single-suction secondary impeller and communicates with the flow pipe and the outlet, and the flow pipe is also connected to the The outflow cavity is connected. This patent has the following disadvantages. The size of the impeller tip clearance will affect the performance of the pump. In the above patent, the tip clearance is relatively large, and the pump performance is relatively poor, which increases the secondary flow loss of the fluid medium in the tip clearance, thereby increasing Volume loss in front of the pump.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the prior art and provide a high-performance guide vane type single-stage cantilever centrifugal pump.

The purpose of this utility model is achieved through the following technical solutions:

A high-performance guide vane type single-stage cantilever centrifugal pump, comprising a casing and an inlet and an outlet arranged on the casing, and a liquid guide chamber communicating with the inlet and the outlet is arranged in the casing, the The housing is provided with a through rotating shaft, on which a double-suction impeller and a single-suction secondary impeller are fixed, and along the axial direction of the double-suction impeller and the single-suction secondary impeller, the double-suction impeller and the single-suction secondary The distance between the blade top surface of the stage impeller and the inner wall of the housing is the blade tip clearance, and guide vanes are provided between the double-suction impeller and the single-suction secondary impeller and the inner wall of the housing. To control the size of the tip clearance.

Preferably, the guide vane is in the shape of a ring, and a diversion groove is opened on it, and the direction of the diversion groove is the same as the flow direction of the medium in the liquid guide chamber.

Preferably, a set of threaded holes are opened on the guide vane, and a bolt matched with the threaded holes passes through the threaded holes to lock the guide vane on the housing.

Preferably, the liquid guide chamber includes a first suction chamber, a second suction chamber and an outflow chamber arranged in the housing, and the first suction chamber and the second suction chamber are symmetrically arranged on the double-suction impeller The two sides of the first suction chamber, the second suction chamber, the inlet and the outflow chamber communicate with each other; the liquid guide chamber also includes a liquid flow channel that communicates with each other and a flow tube that communicates with the outflow chamber, The liquid channel communicates with the outlet and is located at one side of the single-suction secondary impeller.

Preferably, the double-suction impeller is a closed impeller, which includes a double-suction impeller main body, a double-suction front cover and a double-suction rear cover, and the front liquid outflow chamber is located between the double-suction impeller main body and the double-suction front cover. Between, the rear liquid outflow cavity is located between the main body of the double-suction impeller and the rear cover plate of the double-suction, and the axis of the main body of the double-suction impeller is coaxial with the axis of the inlet.

Preferably, the single-suction secondary impeller includes a single-suction secondary impeller main body and a single-suction cover plate, the liquid channel is located between the single-suction secondary impeller main body and the single-suction cover plate, and the single-suction secondary impeller A stage impeller body axis is coaxial with said outlet axis.

Preferably, the outflow chamber at least includes a front liquid outflow chamber and a rear liquid outflow chamber.

Preferably, a rotary bearing is provided on the input end of the rotating shaft, and the input end is fixedly connected with the motor shaft of the motor.

Preferably, the distance from the single-suction secondary impeller to the input end is greater than the distance from the double-suction impeller to the input end.

Preferably, an angular contact ball bearing is provided on the output end of the rotating shaft.

The beneficial effects of the utility model are mainly reflected in: simple structure, exquisite design, easy assembly by adopting an adjustable blade tip clearance structure, realizing adjustable pump performance, meeting the performance requirements of different engines for turbo pumps, and significantly improving product performance adaptability .

Description of drawings

Below in conjunction with accompanying drawing, technical scheme of the utility model is further described:

Figure 1: Structural schematic diagram of the utility model;

Figure 2: Enlarged view of part A in Figure 1;

Fig. 3: A perspective view of guide vanes in the utility model.

Detailed ways

The utility model will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present utility model, and structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present utility model.

As shown in Figures 1 to 3, the utility model discloses a high-performance guide vane type single-stage cantilever centrifugal pump, which includes a housing 1 and an inlet 11 and an outlet 12 arranged on the housing 1, and the The inlet 11 and the outlet 12 are located on the same side of the housing 1, and the housing 1 is provided with a through shaft 2, and the shaft 2 is fixed with a double-suction impeller 3 through the spline, and the double-suction The impeller 3 is located directly below the inlet 11, and the double-suction impeller 3 is a closed impeller, because the efficiency of the closed impeller is high, and the double-suction impeller 3 includes a double-suction impeller main body 36, a double-suction front cover plate 37 and a double-suction rear cover 38, the housing 1 is also provided with a first suction chamber 31, a second suction chamber 32 and an outflow chamber 35, and the first suction chamber 31 and the second suction chamber 32 are located in the The two sides of the double-suction impeller 3 are of symmetrical structure. Compared with the single-suction impeller, the double-suction impeller has a large flow rate and is not easy to generate cavitation, which greatly enhances the service life of the centrifugal pump.

The first suction chamber 31 and the second suction chamber 32 are also in communication with the inlet 11 and the outflow chamber 35; The front liquid outflow chamber 33 is located between the double-suction impeller main body 36 and the double-suction front cover plate 37, and the rear liquid outflow chamber 34 is located between the double-suction impeller main body 36 and the double-suction rear cover plate. 38, the axis of the double-suction impeller body 36 is coaxial with the axis X1 of the inlet 11, and the liquid enters from the inlet 11. Since the axis of the double-suction impeller body 36 is coaxial with the axis of the inlet 11, the The main body 36 of the double-suction impeller is evenly stressed and not easily damaged.

A single-suction secondary impeller 4 is fixed on the rotating shaft 2 through the spline, and the single-suction secondary impeller 4 is located directly below the outlet 12. The single-suction secondary impeller 4 usually adopts a closed For the impeller, because the efficiency of the closed impeller is higher, the use of a single-suction impeller at this time has a high lift and also increases its flow rate. The single-suction secondary impeller 4 includes a single-suction secondary impeller main body 42 and a single-suction cover plate 43. The housing 1 is also provided with a liquid flow channel 41 and a flow pipe. The liquid flow channel 41 is located in the single-suction secondary impeller. One side of the suction secondary impeller 4 communicates with the flow pipe and the outlet 12 , and the flow pipe also communicates with the outflow cavity 35 .

The liquid channel 41 is located between the single-suction secondary impeller main body 42 and the single-suction cover plate 43, the axis of the single-suction secondary impeller main body 42 is coaxial with the axis X2 of the outlet 12, because the single-suction secondary The axis of the impeller main body 42 is coaxial with the axis of the outlet 12 , so the single-suction secondary impeller main body 42 is evenly stressed and not easily damaged.

An input end 21 is provided on the rotating shaft 2, and a rotating bearing 211 is provided on the input end 21, and the input end 21 is fixedly connected with the motor shaft of the motor, so that the centrifugal pump shaft can have slight sliding; the rotating shaft The other end of 2 is provided with an output end 22, and an angular contact ball bearing 221 is provided on the output end 22, which is used to balance the residual axial force on the rotating shaft 2.

The key points of the design of the present utility model are: along the axial direction of the double-suction impeller 3 and the single-suction secondary impeller 4, the top surface of the blade of the double-suction impeller 3 and the single-suction secondary impeller 4 is connected to the surface of the housing 1 The distance between the inner walls is the tip clearance, and the tip clearance of the double-suction impeller 3 mentioned above is equal to the tip clearance of the single-suction secondary impeller 4 . The size of the blade tip clearance will affect the performance of the pump. For example, if the blade tip clearance is relatively large, the pump performance will be relatively poor, which will increase the secondary flow loss of the fluid medium in the blade tip clearance, thereby increasing the volume loss in front of the pump. In the utility model, guide vanes 7 are provided between the double-suction impeller 3 and the single-suction secondary impeller 4 and the inner wall of the housing 1 to control the size of the tip clearance, thereby realizing the pump The adjustment of performance makes it have wider applicability. Specifically, the guide vane 7 is in the shape of a ring, and its specifications can be adjusted accordingly according to actual needs. There is a diversion groove 71 on it, and the direction of the diversion groove 71 is in line with the flow direction of the medium in the guide chamber. The direction is the same, and it plays a drainage role in the flow direction of the medium. A set of threaded holes 72 are opened on the guide vane 7, and a bolt 73 matching the threaded holes 72 passes through the threaded holes 72 to lock the guide vane 7 on the housing 1, optimizing the installation The structure reduces operations, facilitates replacement and maintenance, and improves process efficiency.

The utility model discloses a simple working process of a centrifugal pump with double-suction impellers. When the motor starts to rotate, the motor shaft of the motor is fixedly connected with the input end 21 of the rotating shaft 2, and the rotation of the motor shaft of the motor drives the input End 21 rotates, and at this time, the rotating shaft 2 rotates, and the double-suction impeller 3 and the single-suction secondary impeller 4 are fixed on the rotating shaft 2 through the spline, so the double-suction impeller 3 and the single-suction The secondary impeller 4 also starts to rotate; the liquid flows into the first suction chamber 31 and the second suction chamber 32 from the inlet 11, and when the double-suction impeller 3 rotates, the liquid in the first suction chamber 31 is brought to the The front liquid outflow cavity 33 drives the liquid in the second suction cavity 32 to the rear liquid outflow cavity 34, the front liquid outflow cavity 33 and the rear liquid outflow cavity 34 form the outflow cavity 35, and the liquid flows in the The outflow cavity 35 is summed up, and the outflow cavity 35 is connected with the flow pipe, and the liquid all flows into the flow pipe, and the flow pipe is connected with the liquid on one side of the single-suction secondary impeller 4 The flow channel 41 is connected, the liquid flows into the liquid flow channel 41, and the liquid flow channel 41 is connected with the outlet 12, so that the liquid is discharged from the pump.

The beneficial effects of the utility model are mainly reflected in: simple structure, exquisite design, easy assembly by adopting an adjustable blade tip clearance structure, realizing adjustable pump performance, meeting the performance requirements of different engines for turbo pumps, and significantly improving product performance adaptability .

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for the feasible implementation modes of the present utility model, and they are not used to limit the protection scope of the present utility model. Embodiments or modifications should be included within the protection scope of the present utility model.

Claims (10)

1. A high-performance guide vane type single-stage cantilever centrifugal pump, including a casing (1) and an inlet (11) and an outlet (12) arranged on the casing (1), and the casing (1) is equipped with There is a liquid guiding cavity communicating with the inlet (11) and the outlet (12), and it is characterized in that: the casing (1) is provided with a penetrating rotating shaft (2), and the rotating shaft (2) is fixedly installed There are double-suction impellers (3) and single-suction secondary impellers (4), and along the axial direction of the double-suction impellers (3) and single-suction secondary impellers (4), the double-suction impellers (3) and The distance between the tip surface of the blade of the secondary impeller (4) and the inner wall of the housing (1) is the blade tip clearance, and the double-suction impeller (3) and the single-suction secondary impeller (4) are connected to the Guide vanes (7) are provided between the inner walls of the casing (1) to control the size of the tip clearance. 2. The high-performance guide vane type single-stage cantilever centrifugal pump according to claim 1, characterized in that: the guide vane (7) is in the shape of a ring, and a diversion groove (71) is opened on it, and the guide vane (7) The direction of the flow groove (71) is the same as the flow direction of the medium in the liquid guide cavity. 3. The high-performance guide vane type single-stage cantilever centrifugal pump according to claim 2, characterized in that: the guide vane (7) is provided with a set of threaded holes (72), one of which is connected to the threaded hole (72) Matching bolts (73) pass through the threaded holes (72) to lock the guide vane (7) on the housing (1). 4. The high-performance guide vane type single-stage cantilever centrifugal pump according to claim 3, characterized in that: the liquid guiding chamber includes a first suction chamber (31) and a second suction chamber arranged in the housing (1). Two suction chambers (32) and outflow chambers (35), the first suction chamber (31) and the second suction chamber (32) are symmetrically arranged on both sides of the double-suction impeller (3), the second A suction chamber (31), a second suction chamber (32), an inlet (11) and the outflow chamber (35) communicate with each other; A flow pipe connected to the outflow cavity (35), the liquid flow channel (41) connected to the outlet (12), and located on one side of the single-suction secondary impeller (4). 5. The high-performance vane-type single-stage cantilever centrifugal pump according to claim 4, characterized in that: the double-suction impeller (3) is a closed impeller, which includes a double-suction impeller main body (36), a double-suction front Cover plate (37) and double-suction rear cover plate (38), the front liquid outflow cavity (33) is located between the double-suction impeller main body (36) and the double-suction front cover plate (37), the rear liquid outflow cavity (34 ) is located between the double-suction impeller main body (36) and the double-suction rear cover plate (38), and the axis of the double-suction impeller main body (36) is coaxial (X1) with the axis of the inlet (11). 6. The high-performance guide vane type single-stage cantilever centrifugal pump according to claim 5, characterized in that: the single-suction secondary impeller (4) comprises a single-suction secondary impeller body (42) and a single-suction cover plate ( 43), the liquid channel (41) is located between the single-suction secondary impeller main body (42) and the single-suction cover plate (43), the axis of the single-suction secondary impeller main body (42) and the outlet (12) Axes are coaxial (X2). 7. The high-performance guide vane type single-stage cantilever centrifugal pump according to claim 6, characterized in that: the outflow chamber (35) at least includes a front liquid outflow chamber (33) and a rear liquid outflow chamber (34). 8. The high-performance guide vane type single-stage cantilever centrifugal pump according to claim 7, characterized in that: the input end (21) of the rotating shaft (2) is provided with a rotary bearing (211), and the input end ( 21) Fixed connection with the motor shaft of the motor. 9. The high-performance guide vane type single-stage cantilever centrifugal pump according to claim 8, characterized in that the distance from the single-suction secondary impeller (4) to the input end (21) is greater than that of the double-suction impeller (3) The distance to the input end (21). 10. The high-performance guide vane type single-stage cantilever centrifugal pump according to claim 9, characterized in that: an angular contact ball bearing (221) is provided on the output end (22) of the rotating shaft (2).