JPH0343695A - Self suction style pump - Google Patents

Abstract

PURPOSE:To conduct the suction of priming water at an early stage and in abundance, by opposing a return current hole which is at a partition plate partitioning an impeller case and a pump cover and which leads from a water sink to an impeller chamber, to a cut-out formed at the outer perimeter of each impeller side plate. CONSTITUTION:A pump main body is constituted with a drive chamber case 1 housing the drive machine of an impeller 8, an impeller case 2 forming an impeller chamber 6 that houses the impeller 8 and an air-water separation chamber, and a pump cover 3 forming a suction chamber, a water sink 14 and a discharge chamber. At this constitution, cut-outs 26 are formed at the impeller side plates 21 of respective water delivery passages 23 between respective blades 22 of the impeller 8. And a return current hole 27 which is at a partition plate 5 partitioning the impeller case 2 and the pump cover 3 and which leads to the impeller chamber 6 from the water sink 14, is opposed to the outer perimeter of each impeller side plate 21, at the cut-out part. As a result, the expected purpose is attained by operating alternately positive pressure and negative pressure against the return current hole 27.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a self-priming pump equipped with a gas-liquid separation chamber.

(b) Background of the Technology In order to improve the self-priming performance of conventional self-priming pumps, the primary water remaining in the water reservoir chamber of the pump must be circulated as quickly and in large quantities as possible through the circulation hole from the water reservoir chamber to the impeller chamber. It was being made into. However, if this is done, the pump performance will deteriorate during pumping operation of the pump. In other words, improving self-priming performance results in a decrease in pump performance, which is a contradictory effect. The present invention aims to eliminate such contradictions and provide a self-priming pump that improves self-priming performance without sacrificing pump performance.

(C) Prior art A conventional general self-priming pump to which the pump according to the present invention belongs is shown in Figs. It consists of a pump cover 3, and a partition plate 4 between the drive chamber case 1 and the Iibera case 2.
The pump cover 3 is attached to cover the impeller case 2 and is separated by a partition plate 5. In an impeller chamber 6 in the impeller case 2, an impeller 8 equipped with a driven magnet 7 is rotatably held in a cantilever manner by the partition plate 4, and the upper part of the impeller chamber 6 serves as a steam/water separation chamber 9. . The upper part of the pump cover 3 is a suction chamber 10, and at the lower part of the suction chamber 10, a suction circular hole 11 is bored in the partition plate 5 at the central part of the impeller 8, and that part of the suction chamber 1o (suction chamber Pump cover 3 at the bottom of 10
The central part (lower part of the treetop) is surrounded by a partition wall 12 and serves as a water absorption chamber 13 for water to be absorbed by the impeller 8. and the above suction chamber 1
The lower part of the pump cover 3 (the lower part of the pump cover 3) is used as a water reservoir chamber 14 for the self-priming action of the pump.

FIG. 5 shows the A-A arrow (right side view of the impeller case 2) in FIG. 4, and FIG. 6 shows the B-B arrow (left side view of the pump cover 3). That is, the above-mentioned FIG. 4 is a sectional view taken along the line CC in FIGS. 5 and 6. As shown in FIG. 6, the pump cover 3 is divided into a suction chamber 10, a water reservoir chamber 14 below the suction chamber 14, and a discharge chamber 15 on the right side. establish. The partition plate 5 has a passage 1 at the upper right side leading from the steam/water separation chamber 9 to the upper part of the discharge chamber 15 (directly below the discharge joint 17).
8, a passage 19 communicating from the steam/water separation chamber 9 to the middle part of the discharge chamber 15, and a circulation hole 20 communicating from the water reservoir chamber 14 to the impeller chamber 6 at the lower left side thereof.

With this structure, when the pump is started, the impeller chamber 6
- Air remains in the suction chamber 10 and the piping leading to the suction chamber 10, so the air must be discharged first. Therefore, water is always left in the lower part of the water reservoir chamber 14 and the impeller chamber 6 as priming water, and a circulation hole 20 is opened in the partition plate to connect the water reservoir chamber 14 and the impeller chamber 6, and a motor (not shown) is driven. When the impeller 8 is rotated (in the direction of arrow I in FIG.
At the same time, air in the suction chamber 10 is sucked in from the water suction chamber 13, and water and air are mixed in the impeller chamber 6 and sent to the steam/water separation chamber 9. Air is discharged from the discharge joint 17 through the upper passage 18 of the partition plate 5, and water is discharged from the discharge chamber 15 through the lower passage 19.
Flows down to the bottom. And the lower part of the discharge chamber 15 and the water reservoir chamber 1
4 are connected at the bottom, water and air are continuously sent to the air-water separation chamber 9, and by repeating the above, the suction chamber 1
0 is filled with water and water suction operation, that is, water pumping action is performed.

(The arrow W in the figure indicates the direction of water flow.)

Conventional self-priming pumps have the above-mentioned configuration and function, and when the pump is driven, the air inside the pump is automatically discharged to perform the pumping action. A plurality of circulation holes 20 from the water reservoir chamber 14 to the impeller chamber 6 are provided near the suction portion (11) of the impeller in order to circulate the water.

However, if this method is used, the self-priming property is improved, but there is a problem in that the pumping performance of the liver and kidneys is reduced.

(d) Means for solving the problem In order to solve the above-mentioned conflicting problem that improving self-priming performance reduces pump performance, a notch is provided in the side plate of the impeller spout, and a water reservoir is created. A circulation hole of the partition plate from the impeller chamber to the impeller chamber is provided at the above cut site.

(E) Effect By having the above configuration, when the outer circumferential notch of the impeller passes through the circulation hole, positive pressure and negative pressure act alternately on the circulation hole, which absorbs priming water quickly and in large quantities. Since the M flow hole from the water reservoir chamber to the impeller chamber is located away from the impeller suction port, when the pump is operating water, the suction from the pump suction chamber to the impeller is improved. To improve pump performance without impairing efficiency.

(F) Example The impeller of the self-priming pump according to the present invention is constructed as follows. One example is shown in Figures 1 and 2. Figure 1 is a front view of the pump (see Figure 4 above). Fig. 2 is a side view of the impeller as seen from the partition plate 5 side.This impeller is provided with a notch 26 in the side plate 21 at the tip of each water supply channel 23. The tip of each water supply channel 23 is a cut-out impeller.As shown in FIG. 3 (bottom right of FIG. 4 above), which shows a part of the impeller chamber and the water reservoir chamber of the pump body cut away, The circulation hole 27 of the partition plate 5 from the water reservoir chamber 14 to the impeller chamber 6 is connected to the spout 2 of the impeller 8.
It is intended to be provided at a position corresponding to Section 4.

(G) Effects of the Invention Since the self-priming pump according to the present invention is configured as described above, when the outer peripheral notch of the side plate between each blade of the impeller tip passes through the circulation hole from the water reservoir chamber to the impeller chamber. , positive and negative pressures are applied alternately to the reflux hole, prompting water absorption in a short time and absorbing a large amount of water.The impeller 8 in this state and the reflux hole 27 formed in the partition plate of the impeller chamber. The positional relationship is shown in Figs. 7 and 8 in the direction of arrow F in Fig. 3. FIG. 7 shows when the tip of the blade 22 of the impeller 8 is at the position of the circulation hole 27, at which time the circulation hole becomes positive pressure, and FIG. At this point, the circulation hole becomes negative pressure. Furthermore, since the circulation hole from the water reservoir chamber to the impeller chamber is located at a location away from the suction port of the impeller, the circulation hole does not impede the suction efficiency from the pump suction chamber to the impeller during pump operation. The self-priming efficiency can be increased without sacrificing the operational performance of the beating pump.

[Brief explanation of drawings]

Fig. 1 is a front view of an impeller of a self-priming pump according to the present invention, Fig. 2 is a side view thereof in the direction of arrow E, and Fig. 3 is a side view of a self-priming pump according to the present invention in which the impeller is assembled. The lower part of the impeller chamber and water reservoir chamber are partially cut away. Fig. 4 is a longitudinal sectional view of a conventional general self-priming pump, Fig. 5 is a view taken along the line A-A, Fig. 6 is a view taken along the line B-8, and Figs. 7 and 8 are views showing the self-priming pump according to the present invention. This is an arrow view showing the positional relationship between the impeller and the circulation hole of the pump (Fig. 3). 1... Drive chamber case. 3... Pump cover 6... Impeller chamber. 9... Air Water separation chamber. 14... Water reservoir chamber. 21... Impeller side plate. 2... Impeller case. 5... Partition plate. 8... Impeller. 10... Suction chamber. 15... Discharge chamber. 22... Impeller blade. 23... Water supply channel. 26... Side plate outer periphery cut. 27... Circulation hole.

Claims (1)

[Claims] It houses a pump cover 3 that forms a suction chamber 10, a water reservoir chamber 14, and a discharge chamber 15, an impeller case 2 that forms an impeller chamber 6 that houses an impeller 8, an air-water separation chamber 9, and a drive machine that drives the impeller 8. In a self-priming pump consisting of a drive chamber case 1 and a drive chamber case 1, each blade 2 of an impeller 8
A notch 26 is provided in the impeller side plate 21 at the tip of each water supply channel 23 between the impeller case 2 and the pump cover 3, and a circulation hole 27 from the water reservoir chamber 14 to the impeller chamber 6 of the partition plate 5 between the impeller case 2 and the pump cover 3 is formed in the impeller side plate. A self-priming pump characterized by having 21 outer circumferential cuts and 26 locations.