JPH0227200Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a flow path system structure, and more specifically, it is an effective method for solving undesirable phenomena such as water hammer that occurs in a flow path when a pump is operated. The present invention relates to a flow path system structure for dealing with such problems.

[Prior Art] Pumps are used to supply fluid such as water sucked in through a suction pipe to a predetermined location through a discharge pipe, and usually have safety measures against water hammer, surging, etc. is taken.

FIG. 3 shows an example of the above-mentioned safety measures regarding the piping around the pump. The ends are connected in a liquid-tight manner via attachment portions 40, respectively. In addition, the discharge pipe 30
An appropriate part near the pump P in is connected to the suction pipe 20 via a connecting pipe 22 for forming a bypass flow path, and a valve V is disposed at an appropriate part of the connecting pipe 22. It is possible to adjust the flow rate. Therefore, the connecting pipe 22 can circulate fluid such as water and oil discharged by the pump P from the discharge pipe 30 side to the suction pipe 20 side, effectively preventing water hammer effect, surging, etc. It is now possible to prevent this.

[Problems to be solved by the invention] By the way, when trying to connect the discharge pipe 30 and the suction pipe 20 with the connecting pipe 22, as is clear from FIG. 2
3 and T-shaped pipe fittings 24 are required, which not only complicates the piping work, but also makes the pipe fittings 24
In addition to the necessity of sealing the portions 3 and 24, there was a problem in that it was also necessary to secure the space that should be occupied by the conduit for forming the bypass flow path.

[Purpose of the invention] The present invention was devised in view of the above-mentioned problems of the prior art, and its purpose is to simplify piping work for forming a bypass flow path by eliminating the need for connecting pipes and pipe joints. The object of the present invention is to provide a flow path system structure that is not only flexible and can contribute to space saving, but also is robust.

[Means for Solving the Problems] In order to achieve the above object, the present invention is configured as follows.

That is, the present invention provides a flow path system including an introduction path interposed between the suction pipe and the suction port of the pump, an outlet path interposed between the discharge pipe and the discharge port of the pump, and a return path. Its structural feature is that it is integrally formed, and the outlet path and the inlet path are communicated with each other via a reflux path having a flow rate regulating means.

[Function] For this reason, a part of the fluid such as water that is pushed out from the discharge port of the pump to the discharge pipe via the outlet passage passes through the return passage interposed between the outlet passage and the introduction passage. The water can be returned to the inlet passage on the side of the suction pipe, making it possible to effectively deal with the occurrence of water hammer, surging, and the like. In this case, the entire flow path system consisting of the inlet, outlet, and return channels is integrally formed, so piping work can be reduced, space is not taken up, and the system is robust and safe for use. It can be provided to Moreover, since the reflux path is formed with a flow rate adjustment means so that the flow rate can be adjusted, the flow rate can be adjusted as appropriate in relation to the pump pressure, allowing more suitable use. .

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a perspective view showing a state in which the main body 1 is cut vertically in order to clarify the flow path arrangement state in a flow path system structure as an embodiment of the present invention. .

That is, in the flow path system structure according to the present invention, the main body part 1 is formed of a suitable strong material such as metal, and the suction pipe 20 and the pump P are provided on one side of the main body part 1.
An introduction path 2 to be interposed between the suction port 25 of the
However, on the other side, a lead-out passage 3 is formed to be interposed between the discharge pipe 30 and the discharge port 35 of the pump P, and the outlet passage 3 is attached to the pump P via a mounting part 40 attached to the pump P. can do.

Furthermore, the introduction passage 2 and the output passage 3 in the main body portion 1 communicate with each other via a return passage 4 having a flow rate regulating means 6, and the entire passage system is integrally formed. In this case, as shown in FIG. The flow rate control means 6 controls the flow rate of the fluid.

In the figure, a needle valve structure is used as the flow rate adjustment means 6, and the flow rate is adjusted by a valve rod 8 that moves back and forth within the flow rate adjustment path 5 in response to the rotation of the handle wheel 7. However, the present invention is not necessarily limited to this, and a flow rate adjusting means having an appropriate structure may be provided as necessary as long as the flow rate can be adjusted smoothly.

Note that numerals 9 and 10 in the figure indicate screw holes, 11,
12 indicates through holes, respectively.

Since the present invention is constructed in this way, when using it, one side of the inlet passage 2 in the main body 1 is connected to the suction port 25 of the pump P, and one side of the outlet path 3 is connected to the discharge port 35. The screw holes 9 and 10 and the through holes 11 and 1 of the main body part 1 are connected in a liquid-tight manner.
2, it is screwed and fixed to the mounting portion 40 of the pump P. Further, the main body 1 is attached by connecting the other side of the introduction path 2 in the main body 1 to the pipe end of the suction pipe 20 and the other side of the outlet path 3 to the discharge pipe 30 in a liquid-tight manner.

Thus, by operating pump P,
Fluid such as water can be sent out to a predetermined location through a flow path consisting of suction pipe 20 → introduction path 2 → suction port 25 → pump P → discharge port 35 → outlet path 3 → discharge pipe 30. Moreover, even if there is a risk of water hammer or surging occurring due to sudden closure of the flow path by a closing means such as a valve (not shown) disposed on the side of the discharge pipe 30, the discharge pipe 30 and the suction pipe 20 are pump P
This can be effectively dealt with by the channel system provided in the main body 1 interposed between the two. That is, the inlet passage 2 and the outlet passage 3 in the main body 1 are communicated with each other via the reflux passage 4, and therefore, the reflux passage 4 allows the discharge pipe 3
A bypass flow path is formed between 0 and the suction pipe 20. Therefore, even if there is a sudden pressure rise on the discharge pipe 30 side for some reason, the return flow path 4 in the main body 1 will cause the suction pipe 20 to
It is possible to release this to the side, and it is possible to effectively deal with inconvenient phenomena occurring in the flow channel system, such as water hammer and surging.
Furthermore, since the flow rate adjusting means 6 is disposed in the reflux path 4 in the main body portion 1, the amount of fluid refluxed to the suction pipe 20 side can be adjusted as necessary. In this case, the flow rate adjusting means 6 is connected to the valve rod 8.
When the needle valve has a structure in which the flow rate is adjusted by advancing and retreating, it is possible to make the flow smoother by forming a flow rate regulating passage 5 along the advancing and retreating direction of the valve rod 8 in a part of the return passage 4 in the main body 1. The flow rate can be adjusted accordingly.

Furthermore, regarding the bypass flow path, the main body part 1
Since it can be formed through the return flow path 4 that is integrally formed within the bypass flow path, not only the piping work for forming the bypass flow path but also the use of pipe fittings for pipe connection can be omitted. Furthermore, it is possible to contribute to improving workability, and also to achieve better liquid-tightness of the entire flow path system, more robust overall structure, and space saving.

[Effects of the invention] As described above, according to the invention, the bypass passage for communicating the discharge pipe and the suction pipe with each other is integrally formed with the outlet passage, the return passage, and the introduction passage. Since it can be formed by interposing the main body part, the piping work and pipe connection structure are simplified and maintenance is made easy, and from a space standpoint, it does not take up unnecessary space. Moreover,
It is also possible to effectively deal with inconvenient phenomena occurring in the flow path system, such as water hammer and surging.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main body as an embodiment of the present invention, cut open to reveal the arrangement of the flow path system, and FIG. 2 is a side view of the main body in FIG. 1. Overall side view showing cross-sectional structure, 3rd
The figure is a front view showing a state of piping as a conventional example for forming a bypass flow path. 1...Main body part, 2...Introduction path, 3...Output path,
4... Return path, 5... Flow rate adjustment path, 6... Flow rate adjustment means, 7... Hand wheel, 8... Valve rod, 9, 1
0...Screw hole, 11, 12...Through hole, 20...Suction pipe, 25...Suction port, 30...Discharge pipe, 35...
...Discharge port, 40...Mounting part, P...Pump.

Claims (1)

[Scope of utility model registration request] A flow path system including an introduction path interposed between the suction pipe and the suction port of the pump, a discharge path interposed between the discharge pipe and the discharge port of the pump, and a return flow path is integrally formed, and the A channel system structure characterized in that the channel and the introduction channel are communicated with each other via the reflux channel having a flow rate regulating means.