JPH0663891U - Self-priming pump - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a self-priming pump with low vibration and low noise. [Arrangement] An arc portion of an inlet portion 27 of a passage 14 through which water flowing out of the impeller chamber 11 and an arc portion of a communication passage 28 that connects the delivery tank portion 13 and the impeller chamber 11 have a blade diameter of 0.03 to 0. .05
Doubled [Effect] The impeller blades are sent from the impeller chamber 11 to the delivery tank section.
When passing through the inlet part 27 of the passage 14 for outflowing water to 13 and the communication passage 28 from the delivery tank part 13 to the impeller chamber 11, the flow of water becomes smooth, the impact is reduced, and the pump is lowered. Vibration and noise reduction can be achieved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a self-priming pump for feeding water.

[0002]

[Prior art]

 Generally, a self-priming pump has an impeller casing for accommodating the impeller and a priming tank for supplying priming water in the impeller casing to the pump. Figure 4 shows an example of this type of conventional self-priming pump. In FIG. 4, reference numeral 1 denotes an electric motor. An impeller casing 3 is attached to one side of the electric motor 1, and a rotary shaft 2 is connected to an impeller inside the impeller casing 3. A priming casing 4 is connected to the open side of the impeller casing 3 via a packing 5.

FIG. 5 is an exploded view of the impeller casing 3 and the priming casing 4. The impeller casing 3 and the priming casing 4 have openings facing each other. Reference numeral 5 is a partition plate, and 6 is a packing, which is sandwiched between the impeller casing 3 and the priming casing 4. The partition plate 5 is formed with flow holes 7, 8 and 9 for water flow at predetermined positions and a central flow hole 10 and the packing 6 is provided with these flow holes 7, 8, 9 and the central flow hole. It is configured to prevent water leakage from around the hole 10. Further, the rotary shaft 2 is inserted in the center of the impeller chamber 11 in the impeller casing 3, and the impeller 12 is attached to the tip of the rotary shaft 2 with a mechanical seal sandwiched therebetween. ing.

FIG. 6 is an enlarged view of the impeller casing 3, in which a passage 14 for flowing water from the impeller chamber 11 to the delivery tank portion 13 and a communication passage 15 from the delivery tank portion 13 to the impeller chamber 11 are provided. ing. FIG. 7 is an enlarged view of the priming water casing 4, in which a suction port 16, a suction flow path 17, a water tank portion 18 and a recirculation chamber 19 are formed. The suction flow passage 17 communicates with the impeller chamber 11 on the impeller casing 3 side through the central circulation hole 10 of the partition plate 5 shown in FIG. The water tank portion 18 communicates with the delivery tank portion 13 on the impeller casing 3 side through the circulation hole 7 of the partition plate 5, the circulation tank 8 communicates with the impeller chamber 11, and the circulation chamber 19 includes the circulation hole. 9 communicates with the impeller chamber 11.

In the figure, 20 is a steam separation chamber, and 21 is a discharge port. FIG. 8 shows a state in which the self-priming pump is used to circulate the water in the water tank, 22 is a water tank, 23 is a self-priming pump, which is equipped with a suction port 16 and a discharge port 21, A discharge side pipeline 24 and a suction side pipeline 25 are connected to the water tank 22. Next, the operation will be described.

First, priming water is injected into the priming water casing 4 in advance. The injected water enters the impeller chamber 11. Next, when the electric motor 1 is driven, the impeller 12 in the impeller chamber 11 rotates and the water is stirred by the impeller 12. At this time, air is mixed in the water. The water mixed with air enters the delivery tank unit 13 through the passage 14 as shown by the arrow a in FIG. The water mixed with air passes through the communication passage 15 and is recirculated into the impeller chamber 11 as shown by an arrow b in FIG. Further, most of the water mixed with air flows into the water tank portion 18 of the priming casing 4 shown in FIG. 10 through the through hole 7 of the partition plate 5. An air / water separation chamber 20 is provided above the water tank portion 18, and the water flowing out from the flow hole 7 of the partition plate 5 is separated from the air in the air / water separation chamber 20. As shown by the arrow c, the water is discharged from the discharge port 21 to the water tank 22 through the discharge side conduit 24. On the other hand, the remaining water passes from the water tank portion 18 through the circulation hole 8 of the partition plate 5 as shown by the arrow d, and further passes through the circulation chamber 19 through the circulation hole 9 of the partition plate 5 as shown by the arrow e and again the impeller. Return to the impeller chamber 11 of the casing 3. That is, water circulates between the impeller chamber 11, the water tank portion 18 and the recirculation chamber 19, and only air flows out. Then, when this state continues, the air pressure in the central portion of the impeller chamber 11 and the suction passage 17 gradually decreases. Then, the water in the water tank 22 is sucked up by the pressure difference between the suction passage 17 and the outside pressure. When the water in the water tank 22 flows from the suction port 16 into the suction passage 17 and further into the impeller chamber 11, the water supply state shifts to a full-scale.

The sucked water is recirculated from the water tank portion 18 through the circulation hole 8 and the circulation chamber 19 to the impeller chamber 11. Most of the water flows into the water tank portion 18 of the priming casing 4 through the circulation hole 7 of the partition plate 5. Part of the water that has flowed into the water tank portion 18 is returned to the impeller chamber 11 through the through holes 8 and 9 of the partition plate 5, and most of the water is discharged from the discharge port 21 to the discharge side conduit 24. And flows into the water tank 22. Hereinafter, this state is referred to as a water supply state.

[0008]

[Problems to be solved by the device]

 In the conventional self-priming pump, as shown in the enlarged view of FIG. 11, the impeller is provided from the inlet portion 27 and the delivery tank portion 13 of the passage 14 for flowing water from the impeller chamber 11 to the delivery tank portion 13. The shape of the entrance of the communication passage 15 to the chamber 11 is an acute angle. Further, according to the result of the vibration frequency analysis of the pump in the water supply state, as shown by the dotted line B in FIGS. 2 and 3, the vibration power spectrum and the noise level are 6th and 12th (maximum value) in the rotational order ratio. There was a problem that the vibration was high and the noise was high.

An object of the present invention is to solve the above problems and to provide a self-priming pump with low vibration and low noise.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an electric motor, an impeller fixed to a rotating shaft of the electric motor, an impeller chamber for accommodating the impeller, and an inlet of a passage through which water flowing out from the impeller chamber passes. Section, a delivery tank section for receiving the outflowed water, an impeller casing having a communication passage communicating between the delivery tank section and the impeller chamber, a steam separation chamber communicating with the discharge tank section, and a steam separation section. And a priming casing having a recirculation chamber, which communicates with the chamber and sends water into the impeller chamber, and a circular arc portion of an inlet portion of a passage through which water flowing out of the impeller chamber and a discharge tank portion are provided. A self-priming pump with an arc portion of the communication passage that connects the impeller chamber and the impeller chamber is 0.03 to 0.05 times the impeller diameter.

[0011]

[Action]

 With the above configuration, the blades of the impeller pass through the inlet of the passage for flowing water from the impeller chamber to the delivery tank part and when passing through the communication passage from the delivery tank part to the impeller chamber. The flow of water will be smooth and the impact on the impeller casing will be reduced.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals. In FIG. 1, 27 is an inlet portion, which is an inlet portion of a passage 14 for flowing water from the impeller chamber 11 to the delivery tank portion 13, and has an arc portion 0.03 to 0.05 times the blade diameter at the tip ( R) is provided (see B). Reference numeral 28 denotes a communication passage, which is a passage that circulates from the delivery tank portion 13 to the impeller chamber 11, and has an arc portion (R) having a diameter of 0.03 to 0.05 times the blade diameter (see C).

2 and 3 show the results of vibration frequency analysis (the vertical axis represents the power spectrum of vibration, the horizontal axis represents the rotational order ratio) and the noise frequency analysis results (the vertical axis represents the noise level, the horizontal axis represents the rotational order ratio). ing. The solid line A is the present embodiment, and the dotted line B is the conventional embodiment. As shown in the present embodiment, the shape of the inlet portion 27 of the passage 14 through which the water flowing out from the impeller chamber 11 and the shape of the flow passage 28 that connects the delivery tank portion 13 and the impeller chamber 11 are set to have a blade diameter of 0. It is characterized in that it is provided in an amount of 03 to 0.05 times.

In the above-mentioned configuration, the blades of the impeller have an inlet portion 27 of a passage 14 for allowing water to flow from the impeller chamber 11 to the delivery tank portion 13 and a communication passage 28 from the delivery tank portion 13 to the impeller chamber 11. When passing, the flow of water becomes smooth, the impact on the impeller casing is reduced, and the impact given to the impeller casing 3 is reduced to reduce noise.

This means that, in the vibration frequency analysis result shown in FIG. 2, in the case of the present embodiment A, the vibration level decreases with each rotation order ratio, and particularly, the vibration peaks with the sixth and twelfth rotation ratios. In the case of the present embodiment A based on the decrease in the value and the result of the noise frequency analysis shown in FIG. 3, the noise value of each rotation order ratio is remarkably decreased especially in the sixth and twelfth order. is doing.

[0016]

[Effect of device]

 In the self-priming pump of the present invention, the shape of the inlet of the passage through which the water flowing out from the impeller chamber passes and the flow passage that connects the delivery tank portion and the impeller chamber are 0.03 to 0.05 times the blade diameter. By providing the arc shape, the flow of water becomes smooth, the impact on the impeller casing is reduced, and it is possible to reduce the vibration and noise of the pump.

[Brief description of drawings]

FIG. 1 is a front view of an impeller casing showing an embodiment (a).
And enlarged front view of main parts (b) (c)

FIG. 2 is a vibration power spectrum characteristic diagram of a self-priming pump according to the present embodiment and a conventional example.

[Figure 3] Noise level characteristic diagram

FIG. 4 is a sectional view of a main part of a conventional self-priming pump.

FIG. 5 is a perspective view showing the main part in an exploded manner.

FIG. 6 is a perspective view of a conventional impeller casing.

FIG. 7 is a perspective view of a conventional priming casing.

[Figure 8] Piping diagram connecting the self-priming pump and the water tank

FIG. 9 is a sectional view taken along line YY of FIG.

10 is a sectional view taken along line XX of FIG.

11 is an enlarged front view of the impeller casing shown in FIG.

[Explanation of symbols]

 1 electric motor 2 rotating shaft 3 impeller casing 4 priming casing 11 impeller chamber 12 impeller 13 delivery tank section 14 passage 18 water tank section 20 steam separation chamber 27 inlet section 28 communication passage

Claims (1)

[Scope of utility model registration request] 1. An electric motor, an impeller fixed to a rotary shaft of the electric motor, an impeller chamber for accommodating the impeller, and an inlet portion of a passage through which water flowing out from the impeller chamber passes.
A delivery tank portion that receives the outflowed water, an impeller casing having a communication passage that communicates the delivery tank portion with the impeller chamber, a steam separation chamber that communicates with the discharge tank portion, and a communication with the steam separation chamber. A priming casing having a water tank part for feeding water into the impeller chamber and a recirculation chamber, and a circular arc part of an inlet part of a passage through which water flowing out of the impeller chamber and a delivery tank part and the impeller chamber are provided. A self-priming pump characterized in that an arc portion of a communicating passage communicating with the impeller has a diameter of 0.03 to 0.05 times an impeller diameter.