Device suitable for vacuumizing circulating water pump

Abstract

The utility model discloses a device suitable for vacuumizing a circulating water pump, and relates to the technical field of vacuumizing devices. According to the technical scheme, a water outlet pipeline of a standby circulating water pump is connected with three water diversion pipelines, the three water diversion pipelines are connected with low-pressure forming pipes respectively, water outlets of the low-pressure forming pipes are connected with circulating water return pool pipelines, and the circulating water return pool pipelines are connected with a circulating water pool; a reducer pipe is arranged at a water inlet of the low-pressure forming pipe, the pipe diameter of the reducer pipe is gradually reduced in the direction from the water inlet to a water outlet, a vacuumizing pipeline is connected to the position, located on one side of the reducer pipe, of the low-pressure forming pipe, the vacuumizing pipeline is connected with the top of a volute of the circulating water pump, and the low-pressure forming pipe is higher than the volute; and valves are respectively arranged on the water diversion pipeline and the vacuumizing pipeline. The device continuously vacuumizes the volute of the standby circulating water pump, always keeps the volute full of water, achieves the condition that the pump is started at any time, reduces the preparation time before the circulating water pump is started, does not need to be driven by electric power, and saves the cost.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumping devices, in particular to a device suitable for vacuum pumping of a circulating water pump. Background Art

[0002] Industrial circulating water system is a cooling water system configured for water cooling of production equipment, which uses water as cooling medium and circulates. It is mainly composed of cooling tower, pump group, dosing system, bypass filtration system, make-up water system, etc. The pump group mainly provides circulation power for circulating water. The circulation volume of industrial circulating water is generally large, which leads to a large volume of delivery pump. For example, the total designed water volume is 16000m 3 / h, and the circulation power is provided by three single-stage double-suction centrifugal (SLOW600-860) water pumps. The installation height of the volute of each centrifugal water pump is 1.8m, which has exceeded the highest liquid level of the circulating water pool. The gas phase exists in the volute of the centrifugal water pump, which will affect the normal start-up of the centrifugal water pump. The current solution is to set up two SK-5 vacuum pumps to priming water. Before starting each circulating water pump, start the vacuum pump to extract the gas phase in the volute until all the water is discharged from the outlet of the vacuum pump. It is considered that the circulating water pump is fully primed and can be started. However, this process often takes 10-15 minutes. During this period, the standby circulating water pump cannot be started, which will affect the circulating water consumption of the production unit, and this method has the problem of high energy consumption. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art and provide a device suitable for evacuating a circulating water pump, which replaces the original vacuum pump to continuously evacuate the volute of the spare circulating water pump, always keeping the volute of the spare circulating water pump full of water so as to achieve the condition of starting the pump at any time, reducing the preparation time before starting the circulating water pump, and does not require electric drive, thus saving costs.

[0004] The technical solution of the utility model is:

[0005] A device suitable for vacuuming a circulating water pump, wherein three circulating water pumps are arranged in parallel, two for use and one for standby, the three circulating water pumps are respectively connected to a circulating water pool through a water inlet pipeline, and are connected to a production device that requires circulating water cooling through a water outlet pipeline, the water outlet pipeline of the standby circulating water pump is connected to three water diversion pipelines, the three water diversion pipelines are respectively connected to a low-pressure forming pipe, the water outlet of the low-pressure forming pipe is connected to a circulating water return pool pipeline, and the circulating water return pool pipeline is connected to the circulating water pool; a reducing pipe is arranged at the water inlet of the low-pressure forming pipe, the diameter of the reducing pipe gradually decreases from the water inlet to the water outlet, a vacuuming pipeline is connected to one side of the reducing pipe on the low-pressure forming pipe, the vacuuming pipeline is connected to the top of the volute of the circulating water pump, and the height of the low-pressure forming pipe is greater than the height of the volute; valves are respectively arranged on the water diversion pipeline and the vacuuming pipeline.

[0006] Preferably, a valve is provided on the water inlet pipeline.

[0007] Preferably, a valve is provided on the water outlet pipeline.

[0008] Preferably, valves are provided at both ends of the vacuum line.

[0009] Preferably, the low-pressure forming tube has a length of 600 mm and a tube diameter of 40 mm.

[0010] Preferably, the diameter of the reducer at the water inlet is 40 mm, and the diameter of the reducer at the water outlet is 20 mm.

[0011] Preferably, a short tube with a constant diameter is provided at the water outlet end of the reducer.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The device of the utility model replaces the original vacuum pump to continuously evacuate the volute of the spare circulating water pump, always keeping the volute of the spare circulating water pump full of water so as to achieve the condition of starting the pump at any time, reducing the preparation time before starting the circulating water pump, and does not require electric drive, saving costs.

[0014] 2. The device of the utility model has a simple structure, is easy to maintain, is small in size and does not take up space, and the materials are easily available and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a device suitable for vacuuming a circulating water pump according to the utility model.

[0016] Figure 2 The utility model is a schematic structural diagram of a low-pressure forming tube, a reducing tube and a vacuum pipeline.

[0017] In the figure, 1. circulating water pump; 2. water inlet pipeline; 3. circulating water pool; 4. water outlet pipeline; 5. main water supply pipeline; 6. water supply pipeline; 7. low pressure forming pipe; 8. circulating water return pool pipeline; 9. reducer; 10. short pipe; 11. vacuum pipeline; 12. valve. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0019] Example 1

[0020] like Figure 1As shown, this embodiment provides a device suitable for circulating water pump vacuuming, wherein three circulating water pumps 1 are arranged in parallel, and the three circulating water pumps 1 are respectively connected to the circulating water pool 3 through the water inlet pipeline 2, and connected to the production device that needs circulating water cooling through the water outlet pipeline 4, and valves 12 are respectively arranged on the water inlet pipeline 2 and the water outlet pipeline 4. The three circulating water pumps 1 are used in two ways and one is in standby, that is, two of the circulating water pumps 1 pump the circulating water from the circulating water pool 3 into the production device, and the other circulating water pump 1 is in standby state. When one circulating water pump 1 in the working state fails, the standby circulating water pump 1 is started.

[0021] In this embodiment, Figure 1 As shown, the outlet pipeline 4 of the standby circulating water pump 1 is connected to the main water diversion pipeline 5, the main water diversion pipeline 5 is provided with a valve 12 and connected to three water diversion pipelines 6, the three water diversion pipelines 6 are provided with valves 12, and the three water diversion pipelines 6 are respectively connected to a low-pressure forming pipe 7 with a length of 600 mm and a diameter of 40 mm, the outlet of the low-pressure forming pipe 7 is connected to a circulating water return pool pipeline 8, and the circulating water return pool pipeline 8 is connected to the circulating water pool 3. Figure 2 As shown, a reducer 9 is provided at the water inlet of the low-pressure forming tube 7, and the diameter of the reducer 9 gradually changes from 40 mm to 20 mm from the water inlet to the water outlet, and a short tube 10 with a diameter of 20 mm is provided at the water outlet end. A vacuum line 11 is connected to one side of the reducer 9 on the low-pressure forming tube 7, and the vacuum line 11 is connected to the top of the volute of the circulating water pump 1. The height of the low-pressure forming tube 7 is greater than the height of the volute, and valves 12 are provided at both ends of the vacuum line 11.

[0022] Working principle:

[0023] The water pressure entering the low-pressure forming tube 7 from the water diversion pipeline 6 is maintained at 0.2-0.4MPa, and the pressure water enters the reducer 9 from the water inlet. The reducer 9 converts the pressure energy of the pressure water into velocity energy and ejects it at high speed, forming a vacuum in the low-pressure forming tube 7 area behind the reducer 9, thereby sucking the air in the volute of the circulating water pump 1 through the vacuum pumping pipeline 11; then the flow rate of the pressure water gradually decreases, and finally after the pressure is increased at the water outlet of the low-pressure forming tube 7, the pressure is higher than the atmospheric pressure, so that the pressure water is sprayed into the circulating water pool 3. After the gas in the volute is completely pumped out, the medium water in the volute will be discharged into the circulating water pool 3 together with the pressure water, and the valve 12 on the water diversion pipeline 6 and the vacuum pumping pipeline 11 corresponding to the standby circulating water pump 1 will be opened, so as to ensure that the standby circulating water pump 1 is in a continuous vacuum state; when the circulating water pump 1 is in a working state, the vacuum pumping device is not started. When other circulating water pumps 1 suddenly stop due to failure, the operator can quickly start the standby circulating water pump 1, and the standby circulating water pump 1 can be immediately turned on and put into working state to ensure the circulating water consumption of the production device.

Claims

1. A device suitable for vacuuming a circulating water pump, wherein three circulating water pumps (1) are arranged in parallel, two for use and one for backup, the three circulating water pumps (1) are respectively connected to a circulating water pool (3) through a water inlet pipeline (2), and are connected to a production device requiring circulating water cooling through a water outlet pipeline (4), characterized in that: The water outlet pipeline (4) of the standby circulating water pump (1) is connected to three water inlet pipelines (6), the three water inlet pipelines (6) are respectively connected to low-pressure forming pipes (7), the water outlet of the low-pressure forming pipe (7) is connected to a circulating water return pool pipeline (8), and the circulating water return pool pipeline (8) is connected to the circulating water pool (3); a reducing pipe (9) is arranged at the water inlet of the low-pressure forming pipe (7), the diameter of the reducing pipe (9) gradually decreases from the water inlet to the water outlet, a vacuuming pipeline (11) is connected to one side of the reducing pipe (9) on the low-pressure forming pipe (7), the vacuuming pipeline (11) is connected to the top of the volute of the circulating water pump (1), and the height of the low-pressure forming pipe (7) is greater than the height of the volute; valves (12) are respectively arranged on the water inlet pipeline (6) and the vacuuming pipeline (11).

2. The device suitable for vacuuming a circulating water pump as claimed in claim 1, characterized in that: The water inlet pipeline (2) is provided with a valve (12).

3. The device suitable for vacuuming a circulating water pump as claimed in claim 1, characterized in that: The water outlet pipeline (4) is provided with a valve (12).

4. The device suitable for vacuuming a circulating water pump as claimed in claim 1, characterized in that: Valves (12) are provided at both ends of the vacuum pipeline (11).

5. The device suitable for vacuuming a circulating water pump as claimed in claim 1, characterized in that: The low-pressure forming tube (7) has a length of 600 mm and a tube diameter of 40 mm.

6. The device suitable for vacuuming a circulating water pump as claimed in claim 5, characterized in that: The diameter of the reducer (9) at the water inlet is 40 mm, and the diameter of the reducer (9) at the water outlet is 20 mm.

7. The device suitable for vacuuming a circulating water pump as claimed in claim 1, characterized in that: A short tube (10) with a constant diameter is provided at the water outlet end of the reducer tube (9).

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