Anti-cavitation device for pump for cooling tower

Abstract

An anti-cavitation device of a pump for a cooling tower is arranged on an inlet flange of the pump and comprises a valve body, a connector is arranged below the valve body, external threads are machined on the outer side of the connector, a connecting hole is machined in the inlet flange of the pump, and a threaded mounting hole is machined in the upper end of the connecting hole. An exhaust hole is formed in the valve body, an installation hole is formed in the upper end of the exhaust hole, an air inlet hole is formed in the upper end of the installation hole, a spring and a valve element are arranged in the installation hole, and the spring is located below the valve element and abuts against the valve element to block the air inlet hole. By arranging the anti-cavitation device, the problem of water pump cavitation caused by device problems of the pump for the cooling tower is solved, and the after-sales maintenance cost of the product in the using process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a cavitation resistance device for a pump used in a cooling tower. Background Art

[0002] The water pumps used on cooling towers are usually of large flow rate and low head pump types. Such pump types belong to high specific speed pump types, and their main disadvantage is poor cavitation performance. During the actual use of the pump for the cooling tower, in order to consider the compactness of the device and reduce the floor area, the outlet of the cooling tower and the inlet of the pump are usually directly connected through an elbow. Due to device problems, the flow pattern of the medium at the pump inlet is disordered, the cavitation noise is large, and the damage to the blades is particularly obvious, thereby increasing the after-sales maintenance cost of the pump and reducing the customer satisfaction.

[0003] For the cavitation problem of the water pump caused by device problems, usually by venting the inlet to maintain the pressure balance in the pump cavity, thereby alleviating the cavitation phenomenon of the water pump. However, this method cannot accurately control the air intake of the water pump, and it is very easy to put too much gas into the pump cavity, resulting in a decrease in the flow head of the water pump and affecting the performance of the water pump. At the same time, this method needs to adjust the air intake of the pipeline at any time according to the start and stop of the water pump. Otherwise, it will cause leakage of the pump body or pipeline, resulting in resource loss and increasing safety hazards. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a cavitation resistance device for a pump used in a cooling tower aiming at the above-mentioned deficiencies of the prior art.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is:

[0006] A cavitation resistance device for a pump used in a cooling tower is arranged on the inlet flange of the pump. The cavitation resistance device includes a valve body. A connector is arranged below the valve body, and an external thread is processed on the outer side of the connector. A connection hole is processed on the inlet flange of the pump, and a threaded installation hole is processed at the upper end of the connection hole. The connector is connected to the threaded installation hole at the upper end of the connection hole through the external thread. An exhaust hole is processed in the valve body, an installation hole is processed at the upper end of the exhaust hole, and an air inlet hole is processed at the upper end of the installation hole. A spring and a valve core are arranged in the installation hole. The spring is located below the valve core and presses against the valve core to block the air inlet hole.

[0007] Further, both the external thread and the threaded installation hole adopt British standard threads.

[0008] Further, a conical head is processed on the surface of the valve core, a conical hole is processed at the end of the air inlet hole, and the conical head blocks the conical hole.

[0009] Further, the valve core adopts a valve disc, a sealing gasket is arranged at the end of the air inlet hole, and the valve disc fits with the sealing gasket.

[0010] Further, a waist-shaped hole is machined in the middle of the exhaust hole.

[0011] Compared with the prior art, the cavitation-resistant device for a pump used in a cooling tower of the present utility model has the following beneficial effects:

[0012] 1. By setting the cavitation-resistant device, the cavitation problem of the pump for the cooling tower caused by device problems is solved, and the after-sales maintenance cost during the use of the product is reduced;

[0013] 2. Through the spring pressing design, during the operation of pumps of different models, the opening degree of the valve can be adjusted according to its own suction to control the intake air volume, ensuring that the pump performance is not affected;

[0014] 3. The device can relieve the cavitation phenomenon of the pump without changing the system pipeline conditions, greatly reducing the later transformation cost of the system for users. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the installation of the present utility model;

[0016] Figure 2 is a schematic structural diagram of an embodiment of the present utility model;

[0017] Figure 3 is a schematic structural diagram of another embodiment of the present utility model;

[0018] Among them, 1. Inlet flange, 2. Valve body, 3. External thread, 4. Connecting hole, 5. Exhaust hole, 6. Waist-shaped hole, 7. Mounting hole, 8. Intake hole, 9. Spring, 10. Valve core, 11. Tapered head, 12. Tapered hole, 13. Sealing gasket. Specific Embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be described clearly and completely.

[0020] Such as Figure 1As shown in the figure, a cavitation-resistant device for a pump used in a cooling tower is provided on the inlet flange 1 of the pump. The cavitation-resistant device includes a valve body 2. A connector is provided below the valve body 2, and an external thread 3 is machined on the outer side of the connector. A connection hole 4 is machined on the inlet flange 1 of the pump, and a threaded mounting hole is machined at the upper end of the connection hole 4. The connector is connected to the threaded mounting hole at the upper end of the connection hole 4 through the external thread 3. In this embodiment, both the external thread and the threaded mounting hole adopt British standard threads. Since the British standard thread is a fine thread, after the valve body 2 is connected to the connection hole 4, it has good sealing performance. An exhaust hole 5 is machined in the valve body 2, and a waist hole 6 is machined in the middle of the exhaust hole 5. The diameter of the waist hole 6 is smaller than that of the exhaust hole 5, which is used to control the intake air volume. An installation hole 7 is machined at the upper end of the exhaust hole 5, and an intake hole 8 is machined at the upper end of the installation hole 7. A spring 9 and a valve core 10 are arranged in the installation hole 7. The spring 9 is located below the valve core and presses against the valve core 2 to block the intake hole 8.

[0021] Embodiment 1

[0022] As Figure 2 shown in the figure, in this embodiment, a conical head 11 is machined on the surface of the valve core 2, and a conical hole 12 is machined at the end of the intake hole 8. Under the action of the spring, the conical head 11 blocks the conical hole 12.

[0023] Embodiment 2

[0024] As Figure 3 shown in the figure, in this embodiment, the valve core 2 adopts a valve disc. A sealing gasket 13 is arranged at the end of the intake hole 8. Among them, an installation groove is arranged on the outer side at the end of the intake hole, and the sealing gasket 13 is embedded in the installation groove. Under the action of the spring, the valve disc fits with the sealing gasket 13.

[0025] Among them, when the water pump stops running, the valve core 2 forms a seal with the valve body through the elastic force of the spring 9. At the same time, the pressure in the pipeline will also be applied to the valve core 2 to ensure that there is no medium leakage. During the operation of the water pump, under the centrifugal action of the impeller, a suction force will be generated at the intake hole 8, overcoming the elastic force of the spring 9 so that external air enters the water pump, reducing the pressure in the pump cavity and alleviating the cavitation phenomenon of the water pump.

[0026] The present utility model is not limited to the described embodiments. Those skilled in the art can still make some modifications or changes without departing from the spirit and public scope of the present utility model. Therefore, the scope of the patent protection of the present utility model is subject to the scope defined by the claims.

Claims

1. A cavitation-resistant device for a pump used in a cooling tower, which is arranged on the inlet flange of the pump, and is characterized in that: The anti-cavitation device includes a valve body, a connecting head is arranged below the valve body, an outer side of the connecting head is processed with an external thread, a connecting hole is processed on the inlet flange of the pump, a threaded mounting hole is processed on the upper end of the connecting hole, the connecting head is connected to the threaded mounting hole at the upper end of the connecting hole through the external thread, an exhaust hole is processed in the valve body, a mounting hole is processed on the upper end of the exhaust hole, an air inlet hole is processed on the upper end of the mounting hole, a spring and a valve core are arranged in the mounting hole, and the spring is located below the valve core to support the valve core and block the air inlet hole.

2. The cavitation resistance device for a pump used in a cooling tower according to claim 1, characterized in that: The external threads and threaded mounting holes are both British threads.

3. The cavitation-resistant device for a pump used in a cooling tower according to claim 1, wherein: A conical head is processed on the surface of the valve core, a conical hole is processed at the end of the air inlet hole, and the conical head blocks the conical hole.

4. The cavitation-resistant device for a pump used in a cooling tower according to claim 1, characterized in that: The valve core adopts a valve sheet, and a sealing gasket is arranged at the end of the air inlet hole, and the valve sheet is fitted with the sealing gasket.

5. The anti-cavitation device for a pump used in a cooling tower according to claim 1, wherein: A waist hole is processed in the middle of the exhaust hole.

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