JP2003239887A - Self suction type pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self suction type pump in which noise is reduced, and, a self suction characteristic and stable operation is maintained. <P>SOLUTION: This self suction type pump is provided with a main body casing 20 housing an impellor therein, a second casing 30 forming a suction water passage 32 and a water sending passage (an air water separation chamber) 31, a parting part 40 put between both casings 20, 30 and having a water passage opening formed at a designated position. Distance between a surface the second casing 30 side of a blade 102 composing the impellor 100 is 1.5-3 times of height of the blade 102 of the impellor 100. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-priming pump which draws in priming water necessary for operating the pump by itself, and more particularly to a pump capable of reducing noise. 2. Description of the Related Art FIG. 4 is a side view showing an example of a self-priming pump with a part cut away. The self-priming pump 1 includes a main casing 20 in which an impeller 26 described later is accommodated, a second casing 30 disposed to face the main casing 20,
A partition 40 is provided between the casings 20 and 30 and has an opening for water circulation formed at a predetermined position. [0003] A motor casing 21 is provided in a main body casing 20.
, A fan chamber 22, a vortex chamber 23 for accommodating an impeller 26 described later, and a flowing water channel 24 through which water pressurized by the centrifugal force of the vortex chamber 23 and the impeller 26 is provided. In the motor section 21, a shaft 25 is rotatably supported by a pair of bearing sections 21a and 21b. A rotor core 25a, a fan 25b, and an impeller 26 are attached to the shaft 25 from the left side in FIG. Further, a stator 27 is provided at an outer diameter portion of the rotor. [0004] The impeller 26 has a boss 26a fixed to the shaft 25, and a plurality of blades 26b provided around the boss 26a at circumferentially required angular intervals. Let T be the height of the blade 26b,
Assuming that the gap between the right end in FIG. 3B and the partition 40 is d, d / T is around 0.25. [0005] In the second casing 30, a water absorption passage 32 and a water supply passage (not shown) are formed. A discharge pipe 33 is provided at an upper end of the water supply passage, and a suction pipe 34 is provided at an upper end of the water absorption passage 32. [0006] The water suction passage 32 also serves as a water tank chamber for filling with water for priming. When the motor is started, the flowing water passage 24 and the water supply passage also serve as a steam-water separation chamber in which the air in the mixture of water and air generated by the rotation of the impeller 26 is separated upward, and the water is separated downward. [0007] The partition section 40 includes a plate-shaped partition plate 41 made of rigid stainless steel or the like, and packings 42 and 43 mounted so as to sandwich the partition plate 41. The second casing 30 is fastened to the main casing 2.
0. In the center of the partition 40, a second casing 3
A water inlet 45 is provided to allow the water to flow into the swirl chamber 23 from the water suction passage 32 in the inner space 0. The water suction passage 32 is provided below the water suction port 45.
A water passage (not shown) for guiding water stored in the lower end of the vortex chamber into the vortex chamber 23 is provided. Further, the water passage 24 is provided above the water inlet 45.
A water supply port 46 for flowing water from inside into the water supply passage is provided. [0011] The self-priming pump described above has the following problems. That is, the impeller 2
The water that has passed through the water inlet 45 due to the suction by the rotation of the nozzle 6 generates noise due to the turbulent flow of the water flow due to the rotation of the impeller 26. FIG. 5 is a graph showing noise characteristics of the self-priming pump 1. Although the HQ characteristic is good, the average noise level is 37 dB, which is higher than the allowable noise level of 35 dB. Also, it emits very high noise at three specific frequencies, which is very annoying. In addition, the self-priming characteristics sometimes deteriorated. Further, since the space between the blade 26b and the partition portion 40 is narrow, dust and the like are easily clogged,
The impeller 26 sometimes locked. Accordingly, an object of the present invention is to provide a self-priming pump that can reduce noise, maintain the self-priming characteristics, and has no risk of locking. [0014] In order to solve the above problems and achieve the object, a self-priming pump of the present invention is configured as follows. A main casing for accommodating the impeller, a second casing for forming a water intake passage, a water supply passage and a steam / water separation chamber, and an opening for water circulation formed at a predetermined position between the two casings. The distance between the surface of the blade constituting the impeller on the second casing side and the partition plate is 1.5 to 3 times the height of the blade of the impeller. It is characterized by being formed in. FIG. 1 is a side view, partially cut away, showing a self-priming pump 10 according to an embodiment of the present invention.
In this figure, the same reference numerals are given to the same functional parts as those in FIG. The self-priming pump 10 includes an impeller 10 described later.
0, a second casing 30 disposed opposite to the main casing 20, and a partition portion sandwiched between the two casings 20, 30 and having an opening for water circulation formed at a predetermined position. 40. The main body casing 20 has a motor 21
, A fan chamber 22, a vortex chamber 23 for accommodating an impeller 100 described later, and a flowing water channel 24 through which water pressurized by the centrifugal force of the vortex chamber 23 and the impeller 100 is provided. The motor section 21 includes a pair of bearing sections 21a, 21.
The shaft 25 is rotatably supported by b. A rotor core 25a, a fan 25b, and an impeller 100 are attached to the shaft 25 from the left side in FIG. Further, a stator 27 is provided at an outer diameter portion of the rotor. The impeller 100 includes a boss 101 fixed to the shaft 25, and a plurality of blades 102 provided around the boss 101 at predetermined angular intervals in the circumferential direction. T is the height of the blade 102, and blade 1
Assuming that the gap between the right end of FIG. 02 in the drawing and the partition portion 40 is d, d / T = 1.5 to 3.0 is preferable. The reason will be described later. The second casing 30 has a water absorption passage 32
And a water supply passage (not shown). A discharge pipe 33 is provided at an upper end of the water supply passage, and a suction pipe 34 is provided at an upper end of the water absorption passage 32. The water absorption passage 32 also serves as a water tank chamber for filling with water for priming. When the motor is started, the water passage 24 and the water supply passage also function as a steam-water separation chamber in which the air in the mixture of water and air generated by the rotation of the impeller 100 is separated upward, and the water is separated downward. The partition section 40 has a plate-shaped partition plate 41 made of a rigid stainless steel or the like, and packings 42 and 43 mounted so as to sandwich the partition plate 41. The second casing 30 is fastened to the main casing 2.
0. In the center of the partition 40, the second casing 3
A water inlet 45 is provided for flowing into the swirl chamber 23 via the water absorption passage 32 in the inside of the whirlpool. In addition, the water inlet 45
A water passage (not shown) for guiding water stored at the lower end of the water absorption passage 32 into the swirl chamber 23 is provided at a lower portion of the water suction passage 32. Further, a water supply port 46 for flowing water into the water supply passage from the inside of the water passage 24 is provided above the water intake port 45. The self-priming pump 10 constructed as described above
Works as follows. That is, when the stator 27 is energized and a magnetic force acts on the rotor core 25a to generate a rotational force on the shaft 25, power is transmitted to the impeller 100 provided with the blades 102 at every required angular interval in the circumferential direction.
The impeller 100 rotates. This rotation generates a centrifugal force, and the water in the vortex chamber 23 is sent to the flowing water channel 24. As a result, suction occurs toward the impeller 100, so that the suction pipe 3
Via 4, water and air remaining in the water absorption passage 32 of the second casing 30 are started to be drawn. The mixture of the inhaled water and air is supplied to the water inlet 45.
Through the vortex chamber 23, is given pressure by the centrifugal force of the impeller 100, passes through the side groove, and
And is conveyed to the water supply passage 31 via the water supply port 46.
The air mixed with the water is separated in the water passage 31, the air escapes from the discharge pipe 33, and the water falls to the lower end of the water passage 31. Depressed water is passed through the water inlet,
00 is sucked into the swirl chamber 23 again by the suction of 00, and becomes the priming of the air remaining in the water suction passage 32 to continuously remove the air. When the air completely escapes from the self-priming pump 10, only the water passes through the water suction port 45 and the water supply port 46, and the pump enters the original operation state. At this time, noise is generated when the impeller 100 passes through the water inlet 45 by suction or when the passing water is disturbed by the rotation of the impeller 100. Here, the reason why d / T is preferable in the range of 1.5 to 3.0 will be described. FIG.
3 is a graph showing a noise characteristic of the self-priming pump 10 when the ratio is 3, and FIG. 3 is a graph showing a noise level when d / T is changed. When d / T is 2.3, as shown in FIG. 2, the average noise level is 32 dB, which is lower than the allowable noise level of 35 dB. Also, there is no peak frequency and no harsh sound is generated. Experimental results have shown that noise characteristics lower than the allowable noise level and having no peak frequency can be obtained when d / T is 1.5 or more. On the other hand, when d / T exceeds 3.0, the water pumping characteristics rapidly decrease. Therefore, in order to maintain the pumping performance, the size of the entire pump becomes large, and the manufacturing cost increases. Therefore, d / T is preferably set to 1.5 to 3.0. Note that by setting d / T to 1.5 or more, a sufficient gap is formed between the blade 102 and the partition portion 40, so that dust and the like are less likely to be clogged, and the operation can be performed stably. There is also an effect. It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. According to the present invention, noise can be reduced while maintaining the self-priming characteristic, and stable operation can be performed without locking the impeller.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a self-priming pump according to an embodiment of the present invention, which is partially cut away. FIG. 2 is a graph showing noise characteristics of the self-priming pump. FIG. 3 is a graph showing a noise level when d / T is changed in the self-priming pump. FIG. 4 is a partially cutaway side view showing an example of a conventional self-priming pump. FIG. 5 is a graph showing noise characteristics of the self-priming pump. DESCRIPTION OF SYMBOLS 10 ... Self-priming pump 20 ... Main body casing 23 ... Swirl chamber 25 ... Shaft 30 ... Second casing 31 ... Water supply passage (air / water separation chamber) 32 ... Water absorption passage 40 ... Partition part 100 ... Impler 101 ... Boss 102 ... Blade

Claims (1)

Claims: 1. A main body casing in which an impeller is housed, a second casing forming a water suction passage, a water supply passage, and a water / water separation chamber; A partition plate having an opening for water circulation formed at a position, wherein a distance between the surface of the blade constituting the impeller on the second casing side and the partition plate is one of the height of the blade of the impeller. A self-priming pump characterized in that the pump is formed to have a ratio of 0.5 to 3 times.