KR0164696B1 - Hot water pump - Google Patents

Abstract

The present invention relates to a hot water circulation pump installed on a pipe such as a boiler to improve the internal structure of the hot water circulation pump for pumping and circulating hot water.

In the present invention, the rotor shaft 12 into which the rotor 13 is press-fitted is mounted inside the stator can 15 which is processed into a multi-stage cylinder shape, and the hot water circulation pump having a structure in which the stator 14 is mounted outside thereof ( 10. In the flange 26 mounted at the front of the stator can 15 and serving as a supporting point of the rotor shaft 12, at one end, the mounting portion 26a and the gap portion 26b are equally spaced. And alternately formed to support the flange 26 and inflow of the fluid, respectively, and a fixing part 26c is formed at the other end so that the bearing 18 of the rotor shaft 12 is press-fitted.

Accordingly, there is an effect that can prevent system troubles such as the inconvenience of spending a lot of time to bleed air and the circulation of hot water to reduce the cooling effect and increase the operating noise.

Description

Hot water circulation pump with smooth air discharge

The drawings show one embodiment of the invention,

1 is a partial sectional view showing an internal configuration of a circulation pump.

2 is a perspective view of the flange of FIG.

3 is a schematic illustration of the side of FIG.

* Explanation of symbols for main parts of the drawings

10: hot water circulation pump 10a: front space part

10b: rear space portion 11: casing

12: rotor shaft 12a: through hole

13: rotor 14: stator

15: Stator can 16: Flange (conventional)

17 impeller 18 bearing

26 flange (invention) 26a: mounting portion

26b: clearance part 26c: fixing part

B: Bend portion d: Crevice length

h: clearance height

The present invention relates to a hot water circulation pump, and in particular, to improve the internal structure of a hot water circulation pump installed on a pipe such as a boiler to pump and circulate hot water, and to smoothly discharge the air so that the internal air is quickly discharged after operation. It relates to a hot water circulation pump.

Referring to FIG. 1, in general, the hot water circulation pump 10 has a predetermined hollow portion through which fluid is sucked and discharged, and a casing 11 and an airtight casing 11 to which the impeller 17 is mounted. It is roughly divided into a driving motor which is held and joined and rotates the impeller 17.

Specifically, the casing 11 located in the front portion (right side in the figure) of the hot water circulation pump 10 volute so as to smoothly form the inlet and outlet side fluid flow of the impeller 17 and convert the kinetic energy of the fluid into pressure energy. And a diffuser is formed therein. The impeller 17 is mounted on the rotor shaft 12 to generate a predetermined rotational force by the electromagnetic force between the rotor 13 and the stator 14.

Between the rotor 13 and the stator 14, a stator can 15 which is processed into a multistage cylinder shape is installed. The stator can 15 has a front space portion 10a and a rear space portion 10b separated by the rotor shaft 12 therein. The stator can 15 serves to keep the stator 14 airtight and is supported. The shaft 12 serves to be rotatably supported via the bearing 18.

On the other hand, the rotor shaft 12, which is usually processed in a ceramic material or the like, is formed with a through hole 12a penetrating in the rotation axis direction. One end of the through hole 12a communicates with the inside of the casing 11 where the impeller 17 is located, and the other end communicates with the rear space portion 10b, so that the casing 11-the front space portion 10a-the rear side. A circulation path of external air and hot water constituted by the space portion 10b, the through hole 12a, and the casing 11 is formed.

For reference, a check ball (not shown) is mounted at the tip (near the impeller 17) of the through hole 12a at the tip of the rotor shaft 12. The check ball functions as a check valve. When the fluid pressure through the rear space portion 10b is greater than the fluid pressure through the impeller 17, the check ball is moved to the right to form a flow of fluid, and vice versa. It moves and closes the through hole 12a so that no flow of fluid is formed.

When the rotor shaft 12 and the impeller 17 are rotated by this configuration, a predetermined vacuum pressure is formed at the center of the impeller 17, and the fluid introduced by the pressure difference at that time is applied to the kinetic energy of the impeller 17 blades. Since it flows in the circumferential direction by receiving centrifugal force, the hot water circulation pump can achieve its intended purpose.

However, in the conventional hot water circulation pump, there is a drawback that air inside the stator can 15 is not discharged smoothly at the initial stage of pump operation. Such structural defects may cause inconvenience such as time consuming air draining during boiler production and installation, and system troubles such as impeding circulation of hot water, reducing cooling effect and increasing operating noise.

Therefore, the present invention is to solve the above-mentioned structural defects, the air inside the stator can is smoothly discharged at the beginning of operation through the structural improvement of the hot water circulation pump to prevent the inconvenience and system trouble due to the air draining It is an object of the present invention to provide a hot water circulation pump having a smooth air discharge structure.

In order to achieve the above object, the present invention includes a rotor shaft 12 into which the rotor 13 is press-fitted, and a stator 14 mounted inside the stator can 15 to be processed into a multi-stage cylinder shape. In the hot water circulation pump 10 of the structure: The flange 26, which is mounted in front of the stator can 15 and serves as a supporting point of the rotor shaft 12, has a mounting portion 26a and a gap portion at one end. 26b are alternately formed at equal intervals to support the flange 26 and inflow of the fluid, respectively, and a fixing part 26c is formed at the other end so that the bearing 18 of the rotor shaft 12 is press-fitted. It is characterized by.

At this time, the mounting portion 26a of the flange 26 has a bent portion B formed at the tip, and the gap portion 26b is shorter than the mounting portion 26a by the clearance length d and shortened by the clearance height h.段) to reduce the flow resistance of the fluid.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a partial cross-sectional view showing the internal configuration of the circulation pump.

As described above, in the hot water circulation pump 10, the impeller 17 is circulated in the fluid composed of the outer space, front space portion 10a, rear space portion 10b, through-hole 12a, and impeller 17. A path is formed, which requires a considerable time for the air in the front space portion 10a and the rear space portion 10b of the stator can 15 to be discharged to the outside by hot water during initial startup.

Such phenomena are related to the flow resistance of the fluid, in particular the gaps between the rotor 13 and the stator 14 and the front flange 16 and bearing 18 which support the rotor shaft 12 and are the inlets of the fluid. ) Air flow is not discharged quickly because of large flow resistance.

At this time, the gap between the rotor 13 and the stator 14 has a significant influence on the driving torque of the motor and thus the pump performance, so that it is difficult to enlarge further, and the flange 16 reduces the flow resistance of the air discharge. It is preferable that it is formed to also maintain the mechanical strength of the impeller 17 support.

2 shows a perspective view of the flange of FIG. 1, and FIG. 3 shows a schematic illustration of the side of FIG. 2.

The flange 25 mounted on the front of the stator can 15 and serving as a supporting point of the rotor shaft 12 has, at one end, the mounting portions 26a and the gap portions 26b alternately formed at equal intervals, respectively, to flanges. The support 26 and the fluid inflow function are performed, and at the other end, a fixing portion 26c is formed so that the bearing 18 of the rotor shaft 12 is press-fitted.

At this time, the mounting portion 26a of the flange 26 has a bent portion B formed at the tip, and the gap portion 26b is shorter than the mounting portion 26a by the clearance length d and shortened by the clearance height h.段) to reduce the flow resistance of the fluid.

Therefore, the flange 26 is formed in a trumpet shape by drawing or welding the fixing part 26c, and then the gap between the fixing parts 26c and the wide flat part opposite to the fixing part 26c is formed in the shape of a fan at equal intervals. After press molding to hold, the outer peripheral surface of the gap portion 26b is cut by the gap length d, and the outer surface of the mounting portion 26a is bent to form the bent portion B. In the gap portion 26b, the size of the gap is largest on the outer circumferential surface and becomes smaller toward the center, so that the gap is close to the flat plate.

In this way, a gap having a predetermined clearance length d and clearance height h is formed on the outer circumferential surface of the flange 26, and when the impeller 17 (FIG. 1) rotates, the impeller 17 is centered. The flow of the fluid is smoothed by the difference between the predetermined vacuum pressure formed and the pressure formed in the gap portion at the outside thereof.

Referring to FIG. 1, conventionally, grooves (not shown) are formed on the outer ring of the bearing 18 to reduce flow resistance, but the size of the grooves is limited and the center of the impeller 17 is limited. Because of the low pressure, the effect is minimal. On the other hand, the present invention does not need to form grooves in the outer ring of the bearing 18.

In addition, since the fan-shaped structure has a larger cross-sectional coefficient than the flat plate structure, the rotor shaft 12 during pump operation is provided by providing sufficient support to the rotor 13 and the rotor shaft 12 through the bearing 18. Minimize the effects of shaking or external shocks.

As described above, the present invention forms a plurality of gaps in the flange of the hot water circulation pump so that the air inside the stator can is smoothly discharged at the initial stage of operation, thereby preventing the inconvenience of spending a lot of time for air deflation and cooling the hot water circulation. It is effective in preventing system troubles such as reducing the effect and increasing operating noise.

While the invention has been shown and described with respect to certain preferred embodiments, it will be understood that the invention can be variously modified and modified without departing from the spirit or scope of the invention as set forth in the following claims. Those skilled in the art can easily know that.

Claims (2)

The rotor shaft 12 into which the rotor 13 is press-fitted is mounted inside the stator can 15 which is processed into a multi-stage cylinder shape, and the hot water circulation pump 10 having a structure in which the stator 14 is mounted outside thereof. The flange 26, which is mounted in front of the stator can 15 and serves as a supporting point of the rotor shaft 12, has mounting portions 26a and gaps 26b alternately at one end at equal intervals. Formed to perform the function of supporting the flange 26 and the inflow of fluid, respectively, and a fixed portion 26c is formed at the other end, so that the air discharge is smooth, characterized in that the bearing 18 of the rotor shaft 12 is press-fitted. Hot water circulation pump. The mounting portion 26a of the flange 26 has a bent portion B formed at a tip thereof, and the clearance portion 26b is shorter than the mounting portion 26a by a clearance length d and has a clearance height h. Hot water circulation pump having a smooth air discharge structure, characterized in that to reduce the flow resistance of the fluid by the step ().