KR-20260062440-A - Self-priming pump with improved pump performance by circulation control valve

Abstract

The present invention relates to a self-priming pump having a built-in circulation control valve capable of improving pump performance by controlling fluid circulation to a priming water circulation unit. A self-priming pump with improved pump performance by a circulation control valve according to an embodiment of the present invention is a self-priming pump with improved pump performance by a circulation control valve comprising a pump unit including a suction unit into which fluid is sucked, a discharge unit into which fluid flowing into the suction unit is discharged, and an impeller located between the suction unit and the discharge unit to forcibly suck and discharge fluid by centrifugal force. The pump unit includes a priming water circulation unit that circulates a portion of the priming water supplied to the suction unit to the discharge unit, and a circulation control valve that opens the priming water circulation unit to circulate priming water during initial startup when the discharge pressure of the discharge unit is relatively low, and automatically blocks the circulation of fluid to the priming water circulation unit when the discharge pressure increases.

Inventors

• 배성우

Assignees

• 주식회사 세고산업

Dates

Publication Date

20260507

Application Date

20241029

Claims (5)

1. A self-priming pump with improved pump performance by a circulation control valve comprising a suction part into which fluid is sucked in, a discharge part into which fluid flowing into the suction part is discharged, and a pump part including an impeller located between the suction part and the discharge part to forcibly suck in and discharge fluid by centrifugal force, The above pump part A priming water circulation unit that circulates a portion of the priming water supplied to the suction unit to the discharge unit, and A self-priming pump with improved pump performance by a circulation control valve characterized by including a circulation control valve that opens the priming water circulation unit to circulate priming water during initial startup when the discharge pressure of the discharge unit is relatively low, and automatically blocks the circulation of fluid to the priming water circulation unit when the discharge pressure increases.
2. In paragraph 1, The above circulation control valve is A circulation inlet through which priming water flows in from the above-mentioned priming water circulation unit, An opening/closing member installed in the above-mentioned circulation inlet hole, slidingly moving within the above-mentioned circulation inlet hole to open and close the above-mentioned circulation inlet hole, and A self-priming pump with improved pump performance by a circulation control valve characterized by including an elastic member that supports the opening/closing member by elastic force to open/close the circulation inlet port according to the discharge pressure.
3. In paragraph 2, The above opening/closing member A self-priming pump with improved pump performance by a circulation control valve characterized by including a pressure acting head portion having a larger circumference than the circumference of the opening/closing member, positioned in a direction facing the priming water circulating from the discharge portion to the suction portion in the priming water circulation portion, so as to resist the priming water discharged from the discharge portion and move the opening/closing member in a direction to close the circulation inlet port.
4. In paragraph 1, It includes an impeller casing installed inside the suction part, with a casing inlet hole formed through the center so that fluid sucked into the suction part flows into the center of the impeller, and The above circulation control valve is A valve casing installed in the suction part and having a circulation inlet hole formed therein for priming water to flow in from the priming water circulation part, and A self-priming pump with improved pump performance by a circulation control valve, characterized by including a suction guide that extends from the valve casing to the portion where the casing inlet hole is located and guides the priming water introduced into the circulation inlet hole to be sucked into the casing inlet hole.
5. In paragraph 4, A self-priming pump with improved pump performance by a circulation control valve characterized in that the above impeller and the above impeller casing are installed in a multi-stage form.

Description

Self-priming pump with improved pump performance by circulation control valve The present invention relates to a self-priming pump with a built-in circulation control valve capable of improving pump performance by controlling fluid circulation to a priming water circulation unit. Generally, a pump is a device for transporting fluid; since pumps installed on land are located at a relatively higher position than the collection tank, the suction pipe and the inside of the pump exist in a state where there is no fluid. When fluid is transferred solely by starting the pump in the absence of fluid, idling occurs, placing a heavy load on the pump. This can lead to easy damage to the pump or necessitate the use of a relatively large-capacity pump. To solve this problem, a self-priming pump has been introduced. The self-priming pump was able to easily draw in and discharge fluid during pump startup by supplying priming water to the inside of the pump and forming negative pressure in the suction part through the priming water, thereby exhausting air to the outside from the suction part. However, since the load on a self-priming pump increases when all the priming water is consumed before fluid flows into the suction section, just like with conventional pumps, Korean Registered Patent Publication No. 10-2473582 (published Dec. 05, 2022) disclosed a "self-priming pump with improved steam-water separation." The aforementioned self-priming pump with improved conventional steam-water separation is configured with a priming water circulation unit that recirculates the priming water to the impeller side, and by recirculating and using the priming water until the pressure for fluid suction is generated, it is possible to prevent the occurrence of pump load due to drainage of the priming water. However, conventional self-priming pumps with improved steam separation had a problem in that the discharged fluid volume was less than the suctioned fluid volume because the incoming fluid was recirculated through the priming water circulation unit even during normal pump operation, and pressure loss occurred due to the recirculation of the fluid, resulting in a decrease in pump performance. FIG. 1 is a schematic side cross-sectional view illustrating a self-priming pump with improved pump performance by a circulation control valve according to an embodiment of the present invention. FIG. 2 is a schematic side cross-sectional view illustrating a self-priming pump with improved pump performance by a circulation control valve according to an embodiment of the present invention, showing the operating state during initial startup. FIG. 3 is a schematic side cross-sectional view illustrating a self-priming pump with improved pump performance by a circulation control valve according to an embodiment of the present invention, showing the operating state after startup. FIG. 4 is a perspective view illustrating a circulation control valve constituting a self-priming pump that improves pump performance by means of a circulation control valve according to an embodiment of the present invention. FIG. 5 is a side cross-sectional view of a circulation control valve constituting a self-priming pump with improved pump performance by a circulation control valve according to an embodiment of the present invention, showing the operating state of the circulation control valve during initial startup. FIG. 6 is a side cross-sectional view of a circulation control valve constituting a self-priming pump with improved pump performance by a circulation control valve according to an embodiment of the present invention, showing the operating state of the circulation control valve after startup. FIG. 7 is a performance curve graph comparing the performance of an example and a comparative example of a self-priming pump in which pump performance is improved by a circulation control valve according to an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. As illustrated in FIGS. 1 to 3, a self-priming pump (100) with improved pump performance by a circulation control valve according to an embodiment of the present invention may include a pump section (110) and a motor section (170). The pump unit (110) can suck in and discharge fluid, and the pump unit (110) can suck in and discharge fluid by the centrifugal force generated by the impeller (140) as the impeller (140) installed inside rotates. The pump unit (110) may include a suction unit (120), a discharge unit (130), and an impeller (140). The suction part (120) has a suction port (121) formed for sucking fluid, and a suction pipe (123) is connected to the suction port (121) so that fluid stored in a collection tank can be sucked in through the suction pipe (123). The suction part (120) can be configured in the form of a casing with one side open. A discharge port (131) may be formed at a position opposite to the suction