JPH0821400A - Jet stream pump - Google Patents

Abstract

PURPOSE:To easily change a nozzle, to effectively prevent clogging of any impurity and to prevent cavitation without mixing air into ejected water so as to acquire high efficiency. CONSTITUTION:A high pressure pipe 10 having a nozzle body 13 inside and a suction pipe 20 with a suction port 23 opened in its middle part are connected in series with each other via flange joints 12 and 21a so as to be separable from each other, and also the outer peripheral part of the nozzle body 13 in the high pressure pipe 10 and downstream side part of the suction port 23 of the suction pipe 20 are linked with each other by means of a linking bar 60 and a guiding blade 24 is provided for guiding sucked water flowing into the suction pipe 20 form the suction port 23 in an ejecting direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet pump called a jet pump or the like, and more particularly to a jet pump for preventing a negative pressure from being generated laterally of a nozzle body.

[0002]

2. Description of the Related Art As is well known, a jet pump sucks and discharges another low-energy fluid by means of an energized jet fluid (jet stream). In such a jet pump, normally, a high pressure pipe is integrally provided by bending the suction passage in the suction pipe into a substantially U shape, and a nozzle body fixed to the tip of the high pressure pipe is concentric in the suction passage. The high-pressure water (driving fluid) in the high-pressure pipe is jetted from the nozzle body to generate a jet flow, and this jet flow exerts a pumping action on the suction water (driven fluid) in the suction pipe. A small diameter hole is formed on the side of the nozzle body to open to the atmosphere to prevent a negative pressure generated on the side of the nozzle body.

[0003]

However, in the jet pump described above, since the high pressure pipe is bent in a U shape and provided in the suction passage, the flow resistance of the high pressure water is large and the loss of the head is avoided. In addition, there is a problem that the structure and shape of the suction passage are complicated, and foreign matters in the suction water are easily entangled with the nozzle body to cause clogging. Further, in the jet pump described above, the side of the nozzle body is opened to the atmosphere to prevent the generation of negative pressure that causes cavitation and the like, so that it is inevitable that air is mixed into the discharged water. There was also a problem.

The present invention has been made in view of the above problems, reduces the flow resistance of high-pressure water to obtain high efficiency, and can effectively prevent clogging of contaminants and the like, and further discharge. An object of the present invention is to provide a jet pump capable of both preventing air from being mixed into water and preventing cavitation.

[0005]

In order to achieve the above object, a jet pump according to the invention of claim 1 is a pump pipe in which a nozzle body is provided, and a suction pipe having a suction port opened in an intermediate portion. And the nozzle body are detachably connected in series in the axial direction, and the nozzle body is detachably attached to the pump pipe.

In addition to the structure of claim 1, a jet pump according to a second aspect of the present invention uses a communicating pipe between the outer peripheral portion of the nozzle body in the pump pipe and a portion of the suction pipe downstream of the suction port. Connected

Further, in the jet pump according to a third aspect of the present invention, in addition to the structure of the first or second aspect, the suction water flowing from the suction port into the suction pipe is guided toward the discharge port. A guide member is provided.

[0008]

According to the jet pump of the first aspect of the present invention, the pump pipe having the nozzle body fixed thereto and the suction pipe having the suction port formed in the intermediate pipe wall are separably connected in series. Not only can the resistance of high-pressure water be reduced, but the structure of the flow path inside the suction pipe can also be simplified, the resistance of suction water can be reduced, and high efficiency can be obtained, and clogging of foreign substances can be effectively prevented. Since the tube can be separated from the suction tube and only the nozzle body can be easily replaced, it is easy to change the characteristics of the pump, for example, change the nozzle shape according to the application, and obtain high versatility.

According to the jet pump of the second aspect of the present invention, the outer peripheral portion of the nozzle body of the pump pipe is connected to the suction pipe by the communication pipe, and the water introduced from the suction pipe through the communication pipe is negative. Since pressure is prevented from being generated, air is not mixed in the discharged water, and kyovitation can be effectively prevented.

Further, according to the jet pump of the third aspect of the present invention, by providing the suction port of the suction pipe with the guide member for guiding the flow of the suction water flowing into the suction pipe toward the discharge port side, The flow resistance of suction water can be reduced and higher efficiency can be obtained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing a jet pump according to an embodiment of the present invention. In the figure, 10 is a high pressure pipe (pump pipe), 20 is a suction pipe, 30 is a gate valve for adjusting the amount of discharged water, and 40 is a water supply pipe. The high-pressure pipe 10 is a straight pipe having a predetermined length with both ends open, and flange joints 11 and 12 are fixed to the outer peripheral portions of both ends by welding or the like. This high-pressure pipe 10 is connected to a high-pressure water supply source (not shown) through a connecting pipe or the like whose lower end in the drawing is connected by a flange joint 11, and the upper end in the drawing is connected to the lower end of the suction pipe 20 by a flange joint 12 in the drawing. It is connected.

In the high-pressure pipe 10, a substantially conical nozzle body 13 whose diameter is reduced from the inlet toward the outlet (upward in the drawing) is accommodated and is directed inside the suction pipe 20 in the upper part in the drawing. It constitutes a well-known nozzle. In the nozzle body 13, a flange joint 19 is fixed to the outer circumference of the large diameter side end by welding or the like,
This flange joint 19 is connected to the flange joint 11 of the high-pressure pipe 10.
It is attached by tightening it with bolts and nuts. That is, the nozzle body 13 is inserted into the high-pressure pipe 10 from its inlet, and the flange joint 19 is integrally fastened to the flange joint 11 of the high-pressure pipe 10 and the above-mentioned flange joint of the connecting pipe to be attached to the high-pressure pipe 10. To be As is well known, the nozzle body 13 injects the high pressure water supplied from the high pressure water supply source into the suction pipe 20 as a jet flow.

Further, the high-pressure pipe 10 is integrally formed with a nipple portion 14 which is opened to the side of the nozzle body 13 at the outer peripheral portion in the middle in the axial direction. A flange joint 15 is fixed to the tip of the nipple portion 14 by welding or the like, and the branch pipe 50 is connected to the nipple portion 14 by the flange joint 15. The branch pipe 50 is provided with three branch portions 51, 52, 53 in a T-shape, the branch portion 51 is connected to the nipple portion 14 by fixing a flange joint 54 to the end portion, and the branch portion 52 is connected to the valve 5.
5, the branch portion 53 is connected to the communication pipe 60 via the valve 56.

The suction pipe 20 includes a throat portion 21 and a discharge portion 2.
2 and the suction portion 23 communicate with each other in a substantially T-shape, and the throat portion 2
1 and the discharge part 22 are aligned and open, and the suction part 2
3 opens at a right angle between the throat portion 21 and the discharge portion 22. The throat portion 21 has a taper shape that decreases in diameter toward the opening end, and the discharge portion 22 and the suction portion 23 have a uniform and larger inner diameter than the high pressure pipe 10 and extend in a straight line. , The discharge part 22 and the suction part 23 have flange joints 21a,
22a and 23a are fixed by welding or the like.

The throat portion 21 is the flange joint 2
1a is fastened to the flange joint 12 of the high-pressure pipe 10 by bolts and nuts and connected to the high-pressure pipe 10, and in the discharge part 22, the flange joint 22a is fastened to the flange joint 41 of the water supply pipe 40 to connect the gate valve 30. The suction pipe 23 is connected to the water supply pipe 40 through the suction pipe 23, and the flange joint 23a is connected to the water suction pipe by fastening the flange joint of the water suction pipe (not shown). The discharge part 22 described above corresponds to a discharge port, and the suction part 23
Corresponds to the suction port.

The suction pipe 20 has a suction portion 23 inside.
Guide vanes (guide members) 24 are fixed at the confluence position of
Further, a nipple portion 25 that opens into the discharge portion 22 is provided on the outer peripheral portion of the discharge portion 22. The guide vane 24 has one end side extending along the center of the suction section 23 and the other end side being the discharge section 22.
It is composed of a plate-shaped member that is curved with its substantially center pointed.
The guide vanes 24 guide the water flowing from the suction section 23 toward the discharge section 22 as indicated by an arrow in the figure.

The nipple portion 25 has a flange joint 2 at the tip.
6 is provided, and the flange joint 26 is fastened to the flange portion 61 of the communication pipe 60 and connected to the communication pipe 60. The communication pipe 60 has a substantially hook shape, and as described above, the valve 5
It is connected to the branch portion 53 of the branch pipe 50 via 6.

In this embodiment, the nozzle body 13 jets high-pressure water as a jet flow into the throat portion 21 of the suction pipe 20, and the jet stream jetted by the nozzle body 13 sucks water from the suction portion 23 and discharges it. It is sent to the section 22. That is, the momentum of the jet flow is given to the water in the suction portion 23 to perform the pumping action. Here, in this embodiment, the high-pressure pipe 10 is straight, and the water flowing from the suction part 23 is guided by the guide vanes 24.
Is guided toward the discharge part 22 and the suction water is smoothly guided to the discharge part 22 with a small resistance. Therefore, high efficiency is achieved.

Further, in this embodiment, the inside of the discharge portion 23 of the suction pipe 20 and the outer peripheral portion of the nozzle body 13 inside the high-pressure pipe 10 are communicated with each other via the communication pipe 60 or the like. For this reason, when the pressure on the outer periphery of the nozzle body 13 is reduced by injecting a jet flow from the nozzle body 13, the water in the discharge part 23 flows back to the outer periphery of the nozzle body 13 in the high pressure pipe 10 via the communication pipe 60 and the like. , Prevent the generation of negative pressure. Therefore, the cavitation phenomenon can be effectively prevented without air being mixed into the discharged water.

Further, in the jet pump of this embodiment, the high-pressure pipe 10 and the suction rod 20 are arranged in series, and the confluence portion of the suction portion 23 in the suction rod 20 has a uniform cross-sectional shape and a relatively large flow. The road is defined. For this reason, high reliability can be obtained without clogging of foreign substances and the like in the water.

In this jet pump, the high pressure pipe 10 and the suction rod 20 are connected by fastening the flange joints 12 and 21a, and the high pressure pipe 10 is fastened to the flange joints 12 and 21a and the flange joint 11 and the connecting pipe. Can be removed and replaced by removing the tightening from the flange joint. Therefore, it is possible to easily change the nozzle body 13 to one having a different characteristic.

In particular, in this embodiment, a flange joint 19 is fixed to the nozzle body 13 itself, and the flange joint 19 is fastened to the flange joint 11 or the like of the high pressure pipe 10 to attach the nozzle body 13 to the high pressure pipe 10. Therefore, replacement of the nozzle body 13 is easier. That is, the nozzle body 13 is
After being inserted into the high-pressure pipe 10 from the opening on the side of the flange joint 11, the flange joint 19 is attached to the flange joint 11 of the high-pressure pipe 10 by fastening, and the removal thereof can be performed in the reverse order, for replacement, etc. It is extremely easy to put on and take off.

In the embodiment described above, the nozzle body 13
A flange joint 19 is fixedly attached to the nozzle body 1 and the flange joint 19 is fastened to the flange joint 11 of the high-pressure pipe 10 or the like.
Although 3 is fixed to the high-pressure pipe 10, the nozzle body 13 itself can be fixed to the high-pressure pipe 10 by welding or the like. When the nozzle body 13 itself is fixed to the high pressure pipe 10 by welding or the like, the nozzle body 13 is replaced by replacing the high pressure pipe 10.

[0024]

As described above, according to the jet pump of the first aspect of the present invention, the pump pipe having the nozzle body fixed thereto and the suction pipe having the suction port formed in the intermediate pipe wall are provided. Since it is detachably connected in series, the flow passage structure in the suction pipe can be made straight and simple, the resistance can be reduced and the efficiency can be improved, and the clogging of foreign matters can be prevented. The effect is that replacement is easy and the nozzle shape can be easily changed according to the application.

According to the jet pump of the second aspect of the present invention, the side portion of the nozzle body of the pump pipe is connected to the suction pipe by the communication pipe, and the water introduced from the suction pipe through the communication pipe is used. Since the negative pressure can be prevented from occurring, the effect of preventing the cavitation phenomenon from occurring without mixing the air into the discharged water can be obtained.

Further, in the jet pump according to the invention of claim 3, since the guide member for guiding the suction water in the discharge direction is provided, the resistance of the suction water flow is small,
The effect is that the efficiency can be further improved.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a jet pump according to an embodiment of the present invention.

[Explanation of symbols]

 10 High-pressure pipe (pump pipe) 11, 12 Flange joint 13 Nozzle body 14 Nipple portion 19 Flange joint 20 Suction pipe 21 Throat portion 21a Flange joint 22 Discharge portion 22a Flange joint 23 Discharge portion 23a Flange joint 24 Guide vane (guide member) 25 Nipple part 50 Branch pipe 60 Communication pipe

Claims (3)

[Claims] 1. A pump pipe having a nozzle body provided inside and a suction pipe having a suction port opened at an intermediate portion thereof are connected so as to be separable in series in the axial direction, and the nozzle body is detachable from the pump pipe. Jet pump characterized by being attached to. 2. The jet pump according to claim 1, wherein an outer peripheral portion of the nozzle body in the pump pipe and a portion of the suction pipe downstream of the suction port are connected by a communication pipe. 3. The jet pump according to claim 1, wherein a guide member is provided in the suction pipe to guide the suction water flowing from the suction port toward the discharge port.