System for preventing cavitation of water pump

Abstract

The utility model discloses a water pump cavitation prevention system which comprises a water pool, a water suction pipe assembly used for water suction of a water pump, a water level gauge used for detecting the water level in the water pool and a controller used for controlling operation of the water pump, and the controller is in signal connection with the water level gauge and the water pump. The pool is provided with a deepened part protruding downwards, and the water suction pipe assembly extends into the deepened part; the water suction pipe assembly comprises a pipe joint for preventing air from gathering on the water pump blade; the top of the pipe joint is a plane; the water suction pipe assembly further comprises a water suction pipe and a water suction disc, wherein one end of the water suction pipe is fixedly communicated with the pipe connector, and the water suction disc is fixedly communicated with the other end of the water suction pipe. The utility model has the positive effect of preventing cavitation of the water pump from influencing the performance of the water pump.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a system for preventing water pump cavitation. Background Art

[0002] In the desulfurization system of the thermal power plant, water pumps are required to transport water. During use, it was found that the water pump impeller cavitation was serious and the impeller needed to be replaced. The new impeller was difficult to match with the water pump casing, affecting the head and flow of the water pump. After investigation by technical personnel, it was found that the main reason affecting the cavitation of the water pump was that air entered the water pump. There are several ways for air to enter the water pump. One is that the suction area of ​​the suction pipe is small. When absorbing water, water forms a vortex above the suction pipe, bringing air into the water pump. Now the diameter of the suction pipe and the end of the water pool is the same as the diameter of the straight pipe section, causing a vortex, which needs to be changed; one is that the depth of the water pool is not enough, causing a vortex in the suction part when the water pump is working. If the water pool is deepened as a whole, the investment will be large and uneconomical; there are also impurities in the water and the sedimentation time is insufficient, and the water is sucked into the water pump again, causing impeller damage; the above problems need to be solved, and a comprehensive solution to solve the cavitation of the water pump is needed. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a system for preventing water pump cavitation, so as to prevent water pump cavitation from causing reduction in water pump head and flow rate and affecting desulfurization effect.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A system for preventing water pump cavitation comprises a water pool, a water suction pipe assembly for the water pump to absorb water, a water level gauge for detecting the water level in the water pool and a controller for controlling the operation of the water pump, wherein the controller is respectively connected with the water level gauge and the water pump signal.

[0006] Furthermore, the water pool is provided with a deepening portion protruding downward, and the water suction pipe assembly extends into the deepening portion.

[0007] Furthermore, the water suction pipe assembly includes a pipe joint that prevents air from gathering on the water pump blades; the pipe joint is in airtight communication with the water pump inlet; and the top of the pipe joint is a plane.

[0008] Furthermore, the water suction pipe assembly also includes a water suction pipe with one end fixedly connected to the pipe joint and a water suction tray fixedly connected to the other end of the water suction pipe.

[0009] Furthermore, the diameter of the water suction pipe is d, and the water suction tray is an inverted cone; the diameter of the small end of the water suction tray is equal to the water suction pipe; the diameter of the large end of the water suction tray is D; D is greater than or equal to 3 times of d; the distance h2 from the large end of the water suction tray to the bottom of the deepened part is 2 times the diameter of the water suction pipe.

[0010] Furthermore, a partition is provided on the bottom surface of the pool close to the deepening portion; and a filter is provided between the top surface of the partition and the side wall of the deepening portion.

[0011] Furthermore, the lowest water level of the pool is h1, and h1≥6D.

[0012] The positive effects of the utility model are:

[0013] The pool deepening part can be set up to deepen the pool locally without deepening the entire pool, thus reducing investment. After the pool is partially deepened, the water absorption depth of the suction pipe is deep enough to avoid vortexes and air entering the water pump when absorbing water;

[0014] By setting the water absorption plate diameter to be 3 times the water absorption pipe diameter and the water absorption plate being located in the pool at a water depth of not less than 6D, sufficient water absorption area of ​​the water absorption plate can be ensured, and no vortex will be formed when absorbing water.

[0015] By setting a flat pipe joint on the top of the pipe, it is possible to prevent air in the water from gathering in the water pump and causing cavitation in the water pump.

[0016] By setting the minimum water level and the water level gauge, the water level gauge monitors the water level in the pool to prevent the water in the pool from being pumped out and causing cavitation in the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 yes Figure 1 A magnified image of point A;

[0019] Figure 3 is a cross-sectional schematic diagram of a pipe joint;

[0020] Figure 4 This is a schematic diagram of the lowest water level in the pool;

[0021] Figure 5 This is the control principle diagram of the utility model.

[0022] In the figure:

[0023] 2-deepening part, 3-partition, 4-filter screen, 5-water suction pipe, 6-water suction tray, 7-pipe joint, 8-water pump, 51-flange, 52-rubber pad. DETAILED DESCRIPTION

[0024] Example 1

[0025] like Figures 1 to 5 As shown,

[0026] A system for preventing water pump cavitation includes a water pool 1, a water suction pipe assembly for a water pump to absorb water, a water level gauge 11 for detecting the water level in the water pool 1, and a controller for controlling the operation of the water pump, wherein the controller is connected to the water level gauge 11 and the water pump signal respectively. The water level gauge 11 can detect the highest water level, the lowest water level and the water replenishment level of the water pool 1.

[0027] The water pool 1 is provided with a deepening portion 2 protruding downward, and the water suction pipe assembly extends into the deepening portion 2. The depth of the deepening portion 2 is determined based on preventing the occurrence of vortices.

[0028] The water suction pipe assembly includes a pipe joint 7 to prevent air from gathering on the water pump blades; the pipe joint 7 is in airtight communication with the water pump inlet; and the top of the pipe joint 7 is a flat surface. By setting the pipe joint 7 with a flat top, it is possible to prevent air in the water from gathering on the top of the water pump 8 to cause cavitation.

[0029] The water suction pipe assembly further includes a water suction pipe 5 having one end fixedly connected to the pipe joint 7 and a water suction tray 6 fixedly connected to the other end of the water suction pipe 5 .

[0030] The diameter of the water suction pipe 5 is d, and the water suction disc 6 is inverted cone shape; the diameter of the small end of the water suction disc 6 is equal to that of the water suction pipe 5; the diameter of the large end of the water suction disc 6 is D; and D is greater than or equal to 3 times of d;

[0031] A partition 3 is provided on the bottom surface of the pool 1 near the deepening part 2; a filter screen 4 is provided between the top surface of the partition 3 and the side wall of the deepening part 2. The filter screen 4 is provided to prevent relatively large foreign objects from falling into the pool 1 and being sucked away by the water pump 8 to damage the impeller; the partition 3 is provided to prevent the mud and the like accumulated at the bottom of the pool 1 from flowing into the deepening part 4 and being sucked away by the suction pipe of the water pump 8, causing cavitation of the impeller of the water pump 8.

[0032] The lowest water level of the water pool 1 is h1, and h1≥6D. The setting of the lowest water level is to prevent the water pump from being emptied and causing impeller cavitation.

[0033] The working process of the utility model is as follows:

[0034] When the water level meter 11 detects that the water pool 1 is at the lowest water level, the water level meter 11 gives an alarm to the controller, and the controller sends a stop signal to the water pump 8 to prevent the water pump 8 from running idle and burning the pump;

[0035] A water replenishment level is set on the water pool 1. When the water level meter 11 detects that the water level in the water pool 1 reaches the point where water replenishment is required, the controller starts the water replenishment pump to replenish water. The flow rate of the water replenishment pump must be greater than the flow rate of the working water pump. A maximum water level is set on the water pool 1. When the water replenishment reaches the maximum water level, the water replenishment is stopped.

[0036] Example 2

[0037] The difference between this embodiment and embodiment 1 is that:

[0038] like Figure 2 As shown,

[0039] The upper end of the pipe joint 7 is provided with a flange, which is connected to the suction pipe 5 of the water pump 8 through the flange; a rubber gasket 52 is added between the flange 51 on the suction pipe 5 and the flange of the pipe joint 7 to prevent water leakage or air from entering, causing cavitation of the water pump.

[0040] Example 3

[0041] The structure of this embodiment is basically the same as that of embodiment 1.

[0042] The difference is that

[0043] like Figure 4 As shown,

[0044] The distance h2 between the large end of the water absorption tray 6 and the bottom of the deepening part 2 is 2 times the diameter of the water absorption pipe 5. If h2 is too small, the water absorption effect will be affected. If h2 is too large, the pool needs to be deepened, which is not economical.

[0045] The above-mentioned embodiments describe content in a relatively detailed and specific manner, and express the preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, and their purpose is to enable technicians in this field to understand the content of the present utility model and implement it accordingly, but they are not limited to the present utility model. The patent scope of the present utility model cannot be limited only by this embodiment, that is, any equivalent changes or modifications made to the spirit disclosed by the present utility model, for researchers or technicians in this field, without departing from the structure of the present utility model, local improvements within the system and changes and conversions between subsystems, etc., are still within the patent scope of the present utility model.

Claims

1. A system for preventing water pump cavitation, characterized in that: It comprises a water pool (1), a water suction pipe assembly for a water pump to suck water, a water level meter (11) for detecting the water level in the water pool (1), and a controller for controlling the operation of the water pump, the controller being connected to the water level meter (11) and the water pump signal respectively; The water pool (1) is provided with a deepening portion (2) protruding downward, and the water suction pipe assembly extends into the deepening portion (2); The water suction pipe assembly comprises a pipe joint (7) for preventing air from gathering on the water pump blades; the pipe joint (7) is in airtight communication with the water pump inlet; the top of the pipe joint (7) is a flat surface; The water suction pipe assembly further comprises a water suction pipe (5) having one end fixedly connected to the pipe joint (7) and a water suction tray (6) fixedly connected to the other end of the water suction pipe (5); The diameter of the water suction pipe (5) is d, and the water suction disc (6) is in an inverted cone shape; the diameter of the small end of the water suction disc (6) is equal to that of the water suction pipe (5); the diameter of the large end of the water suction disc (6) is D; D is greater than or equal to 3 times d; the distance h2 from the large end of the water suction disc (6) to the bottom of the deepening portion (2) is 2 times the diameter of the water suction pipe (5); A partition plate (3) is provided on the bottom surface of the pool (1) close to the deepening portion (2); a filter screen (4) is provided between the top surface of the partition plate (3) and the side wall of the deepening portion (2); the lowest water level of the pool (1) is h1, and h1≥6D.

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