A jet self-priming device for adjustable centrifugal pumps

Abstract

The application discloses a jet self-suction device for an adjustable centrifugal pump, which comprises a main pipe, a branch pipe communicated with the main pipe, a mixing pipe communicated with the main pipe, a centrifugal pump communicated with the mixing pipe far from the main pipe, an inlet and an outlet of the centrifugal pump, the mixing pipe communicated with the inlet, a nozzle communicated with the branch pipe, the nozzle liquid outlet end inserted into the main pipe, the nozzle liquid outlet end in a contraction shape, the nozzle liquid outlet end pipe diameter smaller than the branch pipe diameter, the nozzle liquid outlet end towards the mixing pipe, a booster arranged in the branch pipe and the nozzle, the booster in transmission connection with the centrifugal pump, a first flowmeter installed on the main pipe, the first flowmeter located upstream of the branch pipe, a valve and a second flowmeter installed on the branch pipe, and the mixing pipe comprising a contraction section, a throat section and an expansion section, the contraction section communicated with the main pipe, and the expansion section communicated with the inlet. The application can make the ordinary centrifugal pump have the self-suction function, and the efficiency is greatly improved compared with the traditional jet self-suction pump.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pumps, and in particular to an adjustable centrifugal pump jet self-priming device. Background Technology

[0002] Ordinary centrifugal pumps do not have self-priming capability, while traditional jet self-priming pumps (such as...) Figure 3 Although it has good self-priming function, it has three defects: First, the working fluid is part of the pumped fluid, and there is a problem of repeated work by some fluid circulation, resulting in large flow loss in the pump; Second, the flow rate and head of the working fluid cannot be adjusted, and the ratio of working fluid to suction fluid cannot be changed with the working conditions, resulting in large impact loss; Third, the pumped fluid will enter a large pump chamber, resulting in large volumetric loss. Summary of the Invention

[0003] The purpose of this invention is to provide an adjustable jet self-priming device for centrifugal pumps to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides an adjustable centrifugal pump jet self-priming device, comprising:

[0005] The system comprises a main pipe, a branch pipe, and a mixing pipe. A centrifugal pump is connected to the end of the mixing pipe furthest from the main pipe. The centrifugal pump has an inlet and an outlet. The mixing pipe is connected to the inlet. A nozzle is connected to the branch pipe, with its outlet end extending into the main pipe. The outlet end of the nozzle is constricted, and its diameter is smaller than that of the branch pipe. The outlet end of the nozzle faces the mixing pipe. A booster is installed inside the branch pipe and the nozzle, and the booster is connected to the centrifugal pump. A first flow meter is installed on the main pipe, located upstream of the branch pipe. A valve and a second flow meter are installed on the branch pipe. The mixing pipe includes a constriction section, a throat section, and an expansion section. The constriction section is connected to the main pipe, and the expansion section is connected to the inlet.

[0006] Preferably, the booster includes an inducer wheel, which is fixedly connected to an extension shaft, and the extension shaft is drivenly connected to the centrifugal pump.

[0007] Preferably, the centrifugal pump includes a suspension, a rotating shaft, a pump cover, an impeller, and a pump body. The rotating shaft is rotatably connected within the suspension, the pump cover is fixedly connected to the suspension, the rotating shaft exits the pump cover, the pump body is fixedly connected to the pump cover, the rotating shaft is fixedly connected to the impeller, the impeller is located within the pump body, the inlet and the outlet are located on the pump body, and the extension shaft passes through the contraction section, the throat section, and the expansion section and is fixedly connected to the rotating shaft.

[0008] Preferably, a through hole is formed in the main pipe, and a plug is detachably connected to the through hole.

[0009] The technical effects of the present application are as follows: in the device, the main pipe is used for conveying fluid, the fluid in the main pipe is divided into two streams after passing the position of the branch pipe, one of which is working fluid in the branch pipe, and the other is pumping fluid still in the main pipe, the valve on the branch pipe is used for adjusting the flow size of the working fluid, the pumping fluid finally enters the contraction section, and the working fluid increases the pressure under the action of the booster when reaching the position of the nozzle, and at the same time, the working fluid is sprayed out of the nozzle because the liquid outlet of the nozzle is in a contracted shape, at this time, the working fluid has high pressure and fast speed, the working fluid sprayed out of the nozzle directly enters the contraction section, and a low pressure area is formed around the contraction section, so that the pumping fluid is sucked in and mixed with the working fluid in the contraction section, after fully mixing and compression in the throat section, the working fluid enters the centrifugal pump, the first flow meter is used for measuring the total flow in the main pipe, and the second flow meter is used for measuring the flow in the branch pipe. The present application can make the ordinary centrifugal pump have self-suction function, and the efficiency is greatly improved compared with the traditional jet self-suction pump. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0011] Figure 1 It is a structural schematic diagram of the adjustable centrifugal pump jet self-suction device of the present application.

[0012] Figure 2 It is a schematic diagram of the application combined with the centrifugal pump.

[0013] Figure 3 It is a structural schematic diagram of the jet self-suction pump in the prior art.

[0014] 1, main pipe; 2, branch pipe; 3, mixing pipe; 4, centrifugal pump; 5, inlet; 6, nozzle; 7, first flow meter; 8, valve; 9, second flow meter; 10, contraction section; 11, throat section; 12, expansion section; 13, inducer; 14, extension shaft; 15, suspension; 16, rotating shaft; 17, pump cover; 18, impeller; 19, pump body; 20, plug. DETAILED DESCRIPTION

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Reference Figures 1-3 The present invention provides an adjustable jet self-priming device for a centrifugal pump, comprising:

[0018] A main pipe 1 is connected to a branch pipe 2, which in turn is connected to a mixing pipe 3. A centrifugal pump 4 is connected to the end of the mixing pipe 3 furthest from the main pipe 1. The centrifugal pump 4 has an inlet 5 and an outlet. The mixing pipe 3 is connected to the inlet 5. A nozzle 6 is connected to the branch pipe 2. The outlet end of the nozzle 6 extends into the main pipe 1 and is constricted. The diameter of the outlet end of the nozzle 6 is smaller than the diameter of the branch pipe 2, and the outlet end of the nozzle 6 faces the mixing pipe 3. A booster is installed inside the branch pipe 2 and the nozzle 6. The booster is connected to the centrifugal pump 4. A first flow meter 7 is installed on the main pipe 1, located upstream of the branch pipe 2. A valve 8 and a second flow meter 9 are installed on the branch pipe 2. The mixing pipe 3 includes a constriction section 10, a throat section 11, and an expansion section 12. The constriction section 10 is connected to the main pipe 1, and the expansion section 12 is connected to the inlet 5.

[0019] The main pipe 1 is used to transport fluid. After passing through the branch pipe 2, the fluid in the main pipe 1 is divided into two streams. One stream, which is in the branch pipe 2, is the working fluid, and the other stream, which remains in the main pipe 1, is the pumping fluid. The valve 8 on the branch pipe 2 is used to regulate the flow rate of the working fluid. The pumping fluid eventually enters the contraction section 10. When the working fluid reaches the nozzle 6, its pressure is increased by the booster. At the same time, because the outlet end of the nozzle 6 is in a contraction shape, the working fluid is ejected from the nozzle 6. At this time, the working fluid has high pressure and high speed. The working fluid ejected from the nozzle 6 directly enters the contraction section 10 and forms a low-pressure zone around the contraction section 10, which causes the pumping fluid to be drawn in and mixed with the working fluid in the contraction section 10. After being fully mixed and compressed in the throat section 11, it enters the centrifugal pump 4, which can reduce the problem of the fluid repeatedly doing work in the centrifugal pump 4. The first flow meter 7 is used to measure the total flow rate in the main pipe 1, and the second flow meter 9 is used to measure the flow rate in the branch pipe 2.

[0020] The design is further optimized so that the booster includes an inducer wheel 13, which is fixedly connected to an extension shaft 14, and the extension shaft 14 is connected to the centrifugal pump 4 via a drive.

[0021] The centrifugal pump 4 drives the extension shaft 14 to rotate, and the extension shaft 14 drives the inducer 13 to rotate, and the inducer 13 works on the working fluid in the branch pipe 2, so that the pressure of the working fluid is increased.

[0022] Further optimization scheme, centrifugal pump 4 includes suspension 15, rotating shaft 16, pump cover 17, impeller 18 and pump body 19, rotating shaft 16 is rotatably connected in suspension 15, pump cover 17 is fixedly connected with suspension 15, rotating shaft 16 outputs pump cover 17, pump body 19 is fixedly connected with pump cover 17, rotating shaft 16 is fixedly connected with impeller 18, impeller 18 is located in pump body 19, inlet 5 and outlet are located on pump body 19, extension shaft 14 passes through contraction section 10, throat section 11 and expansion section 12 and is fixedly connected with rotating shaft 16.

[0023] The power equipment drives the rotating shaft 16 to rotate, the rotating shaft 16 drives the impeller 18 to rotate, and the rotating shaft 16 drives the extension shaft 14 to rotate, the fluid enters the pump body 19 from the inlet 5, and finally flows out from the outlet.

[0024] Further optimization scheme, the main pipe 1 is provided with a through hole, and the through hole is detachably connected with a plug 20.

[0025] The plug 20 is connected with the through hole through threads, and the plug 20 is more convenient to disassemble or assemble.

[0026] The working principle of the device is that the fluid in the main pipe 1 passes through the position of the branch pipe 2, and is divided into two streams, one of which is the working fluid in the branch pipe 2, and the other is the pumping fluid still in the main pipe 1, the valve 8 can adjust the flow of the working fluid in the branch pipe 2, the pumping fluid finally enters the contraction section 10, and when the working fluid reaches the position of the nozzle 6, the rotating shaft 16 drives the extension shaft 14 to rotate, the extension shaft 14 drives the inducer 13 to rotate, and the inducer 13 works on the working fluid in the branch pipe 2, so that the pressure of the working fluid is increased, and at the same time, since the outlet end of the nozzle 6 is in a contraction shape, the working fluid is sprayed out of the nozzle 6, at this time, the working fluid has high pressure and high speed, the working fluid sprayed out of the nozzle 6 directly enters the contraction section 10, and a low pressure area is formed around the contraction section 10, so that the pumping fluid is sucked in and mixed with the working fluid to enter the contraction section 10, and after being fully mixed and compressed in the throat section 11, the fluid enters the pump body 19 from the inlet 5, and finally leaves the pump body 19 from the outlet.

[0027] The present application can make ordinary centrifugal pumps have self-suction function, and the efficiency is greatly improved compared with traditional jet self-suction pumps.

[0028] Lift ratio:

[0029] Flow ratio:

[0030] Area ratio:

[0031] wherein:

[0032] Q1, Q S - working flow, pumping flow;

[0033] H1-H S - suction head;

[0034] H2-H S - discharge head;

[0035] H1- head at working fluid inlet;

[0036] H2- head at discharge outlet;

[0037] H S - head at nozzle;

[0038] F j - nozzle area;

[0039] F t - throat area;

[0040]

[0041] Flow ratio R H Explanation

[0042] Momentum equation of column mixing section inlet and throat

[0043] pQ1v j + pQ s v s = p(Q1+ Q s )v t

[0044] Let v S = 0, and working fluid and suction fluid are the same, then

[0045] Q s v t = Q1(v j -v t )

[0046] Flow ratio and head ratio relationship can be obtained from head ratio formula

[0047]

[0048] According to the above formula, when adjusting according to different operating conditions of the pump, the proportion of working fluid and pumping fluid is adjusted by valve 8 according to the above formula, so that the pump can realize high efficiency operation under various operating conditions.

[0049] In the description of the present application, it needs to be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] The above-described embodiments are only to describe the preferred modes of the present application, and not to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A jet self-priming device for an adjustable centrifugal pump, characterized by, The utility model relates to a kind of fluid pumping device, including: Main pipe (1), the branch pipe (2) is communicated with the main pipe (1), the mixing pipe (3) is communicated with the main pipe (1), the centrifugal pump (4) is communicated with the mixing pipe (3) far from the one end of the main pipe (1), the centrifugal pump (4) has import (5) and outlet, the mixing pipe (3) is communicated with the import (5), the nozzle (6) is communicated with the branch pipe (2), the nozzle (6) outlet end extends into the main pipe (1), the nozzle (6) outlet end is constricted, the nozzle (6) outlet end pipe diameter size is less than the pipe diameter size of the branch pipe (2), the nozzle (6) outlet end is towards the mixing pipe (3), the branch pipe (2) and the nozzle (6) are provided with booster, the booster is drivingly connected with the centrifugal pump (4), the first flowmeter (7) is installed on the main pipe (1), the first flowmeter (7) is located on the upstream of the branch pipe (2), the valve (8) and the second flowmeter (9) are installed on the branch pipe (2), the mixing pipe (3) includes contraction section (10), throat section (11) and expansion section (12), the contraction section (10) is communicated with the main pipe (1), the expansion section (12) is communicated with the import (5), the main pipe (1) is used for transporting fluid, and the fluid in it is divided into two streams at the connecting position of the branch pipe (2), one enters the branch pipe (2) as working fluid, and the other continues to flow along the main pipe (1) as pumping fluid.

2. A jet suction device for an adjustable centrifugal pump according to claim 1, characterized in that: The booster includes an inducer (13) fixedly connected to an extension shaft (14), and the extension shaft (14) is drivingly connected to the centrifugal pump (4).

3. A jet suction device for an adjustable centrifugal pump according to claim 2, characterized in that: The centrifugal pump (4) includes a suspension (15), a rotating shaft (16), a pump cover (17), an impeller (18), and a pump body (19), the rotating shaft (16) is rotatably connected in the suspension (15), the pump cover (17) is fixedly connected with the suspension (15), the rotating shaft (16) extends out of the pump cover (17), the pump body (19) is fixedly connected with the pump cover (17), the rotating shaft (16) is fixedly connected with the impeller (18), the impeller (18) is located in the pump body (19), the import (5) and the outlet are located on the pump body (19), and the extension shaft (14) passes through the contraction section (10), the throat section (11), and the expansion section (12) and is fixedly connected with the rotating shaft (16).

4. A jet suction device for an adjustable centrifugal pump according to claim 1, characterized in that: A through hole is formed in the main pipe (1), and a plug (20) is detachably connected to the through hole.

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