Jet pump for inhibiting cavitation

Abstract

The utility model belongs to the technical field of water supply and drainage, and particularly discloses a jet pump for inhibiting cavitation, which comprises a working water connecting pipe, a working water branch pipe, a suction chamber, a water suction pipe, a nozzle, a throat pipe inlet pipe, a throat pipe, a diffusion pipe and a water outlet pipe, wherein the working water connecting pipe is inserted into the suction chamber after being connected with the nozzle, and the nozzle is located in the suction chamber; one side of the suction chamber is connected with a water suction pipe, the other side of the suction chamber is sequentially communicated with a throat pipe inlet pipe, a throat pipe, a diffusion pipe and a water outlet pipe in the axial direction, one end of a working water branch pipe is communicated with the pipe section, located outside the suction chamber, of the working water connecting pipe, the other end is communicated with the throat pipe, and a valve is arranged on the working water branch pipe. The jet pump can effectively balance the pressure when the jet pump works, the cavitation is inhibited, and meanwhile, the jet pump is maintained to work under the optimal working condition. The jet pump is simple in structure and long in service life, and an existing jet pump can be directly used for transformation. The jet pump is suitable for being popularized and used in high-pressure working fluid jet pump application occasions.

Description

Technical Field

[0001] This utility model belongs to the field of water supply and drainage technology, and specifically discloses a jet pump for suppressing cavitation. Background Technology

[0002] A liquid jet pump (or jet pump for short) is a fluid transport machine and mixing and reaction device that utilizes the turbulent diffusion effect of a jet to transfer energy and mass. Because jet pumps have no moving parts and possess advantages such as simple structure, easy manufacturing, good sealing, and convenient maintenance, they are now widely used in various fields and industries. Especially under extreme and special working conditions such as underwater, radioactive, flammable, and explosive environments, jet pumps can demonstrate unique advantages, thus their widespread application can generate significant economic and social benefits.

[0003] Cavitation in jet pumps is a crucial research topic. When cavitation occurs, the jet pump generates intense noise and vibration, causing a sharp decrease in pump and system efficiency, and even severely impacting the safe and economical operation of the entire system. Previous researchers have conducted extensive studies to address the cavitation problem in jet pumps. Currently, commonly used solutions include the following:

[0004] 1. Increase the submersion depth of the jet pump;

[0005] 2. Increase the area ratio of the jet pump;

[0006] 3. Reduce the working pressure of the jet pump;

[0007] IV. Optimize the shape of the jet pump nozzle and throat inlet to improve inflow conditions.

[0008] Method one significantly increases manufacturing and installation costs and is detrimental to maintenance; methods two and three cause the jet pump to deviate from its optimal operating conditions, reducing its performance and efficiency; method four offers only limited improvement in operating conditions. In summary, the above methods can improve the cavitation performance of jet pumps to some extent, but they do not fundamentally solve the problem. Utility Model Content

[0009] To address the technical problems listed in the background section, this utility model provides a jet pump for suppressing cavitation. The specific technical solution is as follows:

[0010] A jet pump for suppressing cavitation includes a working water inlet pipe, a suction chamber, a suction pipe, a nozzle, a throat inlet pipe, a throat, a diffuser, and an outlet pipe; wherein the working water inlet pipe is connected to the nozzle and inserted into the suction chamber, and the nozzle is located inside the suction chamber; a suction pipe is connected to one side of the suction chamber, and the other side of the suction chamber is sequentially connected axially to the throat inlet pipe, the throat, the diffuser, and the outlet pipe; characterized in that it further includes a working water branch pipe, one end of which is connected to the section of the working water inlet pipe located outside the suction chamber, and the other end is connected to the throat; a valve is provided on the working water branch pipe.

[0011] Preferably, the section of the working water branch pipe near the throat pipe includes a disc-type pipe, with the center line of the throat pipe coinciding with the center line of the disc-type pipe; the disc-type pipe consists of an outer rim pipe and a radial spoke pipe, with one end of the spoke pipe connected to the inner side of the rim pipe and the other end connected to the throat pipe.

[0012] Preferably, the number of spokes is 2-8, and the spokes are evenly distributed along the rim.

[0013] This arrangement allows the fluid to replenish pressure inside the throat from four directions, resulting in a more uniform and stable flow compared to a single direction.

[0014] Preferably, the angle between the spoke pipe and the throat pipe in the direction of countercurrent is between 15° and 40°.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] Introducing the working fluid into the throat can effectively balance the pressure during the operation of the jet pump, suppress cavitation, and thus ensure the working efficiency of the jet pump and reduce hardware wear.

[0017] Without altering the basic internal structure of the jet pump, it is possible to ensure that the jet pump operates under optimal conditions while improving cavitation conditions.

[0018] This invention has a simple structure, low cost, can be directly modified from existing jet pumps, is not easily damaged, and has a long service life. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the jet pump structure for suppressing cavitation in an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the disc-type pipe structure in an embodiment of the present utility model;

[0021] The components include: 1. Working water inlet pipe; 2. Suction chamber; 3. Suction pipe; 4. Nozzle; 5. Throat inlet pipe; 6. Throat; 7. Diffuser pipe; 8. Outlet pipe; 9. Inlet pipe; 10. Valve; 11. Circular water conveyance pipeline.

[0022] D. Inner diameter of the throat; L. Length of the throat; d1. Inner diameter of the annular water supply pipe; d2. Inner diameter of the inlet pipe; l. Distance between the annular pipe and the inlet end of the throat; θ. Angle between the branch pipe and the direction of the countercurrent flow inside the throat. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] Reference manual attached Figure 1-2 This embodiment provides a jet pump for suppressing cavitation, comprising a working water inlet pipe 1, a suction chamber 2, a suction pipe 3, a nozzle 4, a throat inlet pipe 5, a throat 6, a diffuser 7, and an outlet pipe 8. The working water inlet pipe 1 and the nozzle 4 are connected and installed in the suction chamber 2. The suction chamber 2 is connected to the suction pipe 3, and the suction chamber 2, the throat inlet pipe 5, the throat 6, the diffuser 7, and the outlet pipe 8 are connected in sequence. A working water branch pipe 9 is also provided as a bypass. One end of the working water branch pipe 9 is connected to the section of the working water inlet pipe 1 located outside the suction chamber, and the other end is connected to the throat 6. A valve 10 is provided on the working water branch pipe 9.

[0025] The working water branch pipe 9 is connected to the throat pipe in a disc-type pipe. Its main structure is a ring-shaped water conveyance pipe 11. Fluid flows into the throat pipe through the ring-shaped pipe to increase the pressure in its area, thereby suppressing the occurrence of cavitation problems in the jet pump and ensuring that the jet pump can work stably. Figure 2 The annular water conveyance pipe 11 is the rim pipe in the utility model. The inner diameter of the throat pipe 6 is D, and the length of the throat pipe is L. The inner diameter d1 of the annular water conveyance pipe 11 can be set to 0.15D to 0.4D. The inlet inner diameter d2 can be set to 0.1D to 0.3D (d1>d2) according to the size of d1. The position l of the annular water conveyance pipe 11 connecting to the throat pipe 6 can be located between 0.3L and 0.5L. The number n of the branch pipes (i.e., the spoke pipes in the utility model) required for the connection between the annular water conveyance pipe 11 and the throat pipe 6 can be set to 2 to 8. In the structure shown in the figure, n=4. The angle θ between the branch pipe and the throat pipe in the direction of countercurrent flow can be set to 15° to 40°.

[0026] When the jet pump is working, the high-speed flowing water carries away air, creating a certain degree of vacuum in the suction chamber 2. Under atmospheric pressure, the liquid in the suction pipe 3 is drawn into the suction chamber 2 and then transported to the outside through the throat inlet pipe 5, throat 6, diffuser pipe 7, and outlet pipe 8 in sequence. When the working water flow is sufficient, the pressure is too high, and the flow rate is too fast, cavitation can easily occur on the pipe wall when air is entrained from the jet. In this case, allowing part of the working water to flow directly to the rear of the throat through a bypass can balance the pressure in the suction chamber 2 and reduce the occurrence of cavitation.

[0027] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A jet pump for suppressing cavitation, comprising a working water inlet pipe, a suction chamber, a suction pipe, a nozzle, a throat inlet pipe, a throat, a diffuser, and a discharge pipe; wherein, After the working water pipe is connected to the nozzle, it is inserted into the suction chamber, and the nozzle is located in the suction chamber; a water suction pipe is connected to one side of the suction chamber, and the other side of the suction chamber is connected to the throat inlet pipe, throat, diffuser pipe and water outlet pipe in sequence along the axial direction. The feature is that it also includes a working water branch pipe, one end of which is connected to the pipe section of the working water pipe located outside the suction chamber, and the other end is connected to the throat pipe. A valve is provided on the working water branch pipe. The section of the working water branch pipe near the throat pipe includes a disc-type pipe, with the center line of the throat pipe coinciding with the center line of the disc-type pipe. The disc-type pipe consists of an outer rim pipe and a radial spoke pipe, with one end of the spoke pipe connected to the inner side of the rim pipe and the other end connected to the throat pipe.

2. The jet pump for suppressing cavitation according to claim 1, characterized in that, The number of spokes is 2-8, and the spokes are evenly distributed along the rim.

3. A jet pump for suppressing cavitation as described in claim 2, characterized in that, The angle between the spoke pipe and the throat pipe in the direction of countercurrent is between 15° and 40°.

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