JPS6331038B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a pulsation prevention method for preventing noise, vibration, etc. that occurs when operating water pressure pumps, hydraulic pumps, etc. that operate various equipment in general buildings, factories, ships, etc. It is related to the device.

[Conventional technology and its problems]

Many water pressure pumps, hydraulic pumps, etc. are used in general buildings, factories, ships, etc. to operate their equipment. ) occurs, it not only causes damage to the pump piping, but also causes noise and vibration, which can lead to pollution problems.

Therefore, in the past, a communication hole was provided in the peripheral wall of the liquid passage tube that communicated with the inside and outside, and an elastic tube was tightly covered with the outer periphery of the tube, and flanges formed at both ends of the tube were attached to the flanges at the ends of the liquid passage tube. and inserting and holding these into a casing to connect the liquid passage pipe to the pump piping, and a cavity is formed in the casing to accommodate an expanding portion of the elastic tube that expands when the pressure inside the liquid passage pipe increases. A valve is generally used. However, when installing the elastic tube, the above-mentioned tube applies twisting force to the flange of the tube, making it difficult to completely tighten it, which may cause it to come off the casing or cause fluid leakage, and the flange may be damaged. There are some easy drawbacks.
In addition, as shown in Utility Model Application Publication No. 49-49741,
Some pipes have a blind pipe containing an air sac connected to a location where water hammer is likely to occur in the pipe, but because this has a blind pipe, it cannot be installed in a narrow space, and because it is an independent air sac, it cannot be installed for a long time. When used for a period of time, the internal gas escapes and there is a drawback that a sufficient pulsation prevention effect cannot be achieved.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pulsation prevention device that eliminates the above-mentioned drawbacks, has excellent durability, does not cause liquid leakage, and can withstand long-term use.

[Means for solving problems]

In order to achieve the above object, the present invention provides a liquid passage tube having a liquid passage hole in the peripheral wall of the tube and flanges on the outer periphery of both ends, and an elastic tube wound spirally around the outer periphery of the liquid passage tube and housed in the gap between the flanges at both ends. These are inserted into a right cylindrical casing, and the elastic tube is provided with a valve for sealing pressurized gas, so that the gap between the collar and the casing is liquid-tight.

[Effect]

Therefore, since the elastic tube is not fixed by the collar at the end of the liquid passage pipe, it is securely housed within the casing, and has excellent durability without causing local fatigue. Since only a small amount is required, there is no possibility of liquid leakage. In addition, by filling pressure gas from the valve into the elastic tube, a desired pressure state can be maintained at all times, and even if pulsation occurs in the liquid passing through the pipe, the pulsation energy is absorbed by the repeated deformation of the elastic tube.
Water hammer phenomenon and noise are prevented.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The liquid passage pipe 1 has a liquid passage hole 2 in the pipe wall that communicates with the inside and outside.
At the same time, the inner and outer ends of the hole are enlarged into a dish shape so that the liquid can easily pass through, flanges 3 are welded and fixed to both ends of the tube wall, and an elastic tube 5 is inserted into the gap 4 between the flanges 3. Equip it by wrapping it in a spiral. This elastic tube 5 is made of an elastic material such as rubber, has both ends closed, and is provided with a valve 6 at the end so that pressurized gas can be sealed inside the tube.

The liquid conduit 1 and the elastic tube 5 are inserted into a right cylindrical casing 7, and the valve 6 is made to protrude through the casing 7 so as to be connected to an external pressure gas source. An annular groove 8 is provided on the circumferential surface of the collar 3.
A ring 9 is provided to make the gap between the collar 3 and the casing 7 liquid-tight, and a screw hole 10 for pipe attachment is provided on the end face of the collar 3.

The pulsation prevention device constructed as described above is connected to a desired pump line, and compressed gas such as air is sealed in the spiral elastic tube 5. When pulsation occurs in the liquid passing through the pipe, the liquid in the liquid passage pipe 1 enters the outer gap 4 from the liquid passage hole 2 as a pressure wave, compresses the elastic tube 5, and maintains balance. Further, when the pressure wave becomes a trough, the elastic tube 5 expands and pushes the intruding liquid back into the liquid passage pipe 1 from the liquid passage hole 2. That is, by repeatedly deforming the elastic tube, pulsation energy can be absorbed and water hammer phenomenon and noise can be prevented.

Further, when the pressure inside the elastic tube decreases due to long-term use, compressed gas can be filled in from the valve 6.

Furthermore, since the elastic tube 5 is spirally wound around the liquid passage tube 1, there is no need to fix the tube 5 to the liquid passage tube 1 with the collar 3, and the collar 3 is attached to the liquid passage tube 1.
can be welded to improve sealing performance.

The effect of this device on preventing pulsation is as shown in the experimental results shown in FIG. 2b.

The specifications of the pulsation prevention device used for this are: liquid passage pipe diameter 50A, length 400mm, elastic tube diameter 30mmφ,
The number of turns is 8, the air pressure is 0.6 kgf/cm ² , and the pump is a triple plunger pump, with a diameter of 20 mm in each cylinder, a length of 40 mm, a rotation speed of 150 times per minute, and a discharge rate of 5 per minute. Ta.

〔Effect of the invention〕

The effects of the present invention configured as described above are summarized as follows.

(1) Since the elastic tube is wound around the liquid passage pipe, the elastic tube has a simple shape and is easy to manufacture.

(2) Since it can be held by wrapping the elastic tube around the liquid passage pipe, there is no need to fix it to the liquid passage pipe with a collar as in the past, so there is no local fatigue in the elastic tube and the durability is significantly improved. .

(3) For the same reason as above, the collar can be welded to the liquid passage pipe, so there are fewer sealing parts and there is less risk of liquid leakage.

(4) Since the casing has a simple, right-cylindrical shape, commercially available metal pipes, etc. can be cut and used, making it inexpensive to manufacture.

(5) Since the elastic tube is wrapped around the liquid passage pipe,
The elastic tube has a large pressure receiving area and can withstand high pressure waves.

(6) The casing outer cylinder can be designed to be long or short depending on the magnitude of pulsation, and the length and winding pitch of the elastic tube can be easily adjusted accordingly, so the range of implementation is wide.

(7) Pressure gas can be filled into the elastic tube from the valve, so the desired pressure state can be maintained at all times, allowing long-term use.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an example of the implementation of the present invention, FIG. It is a figure showing the performance of a prevention device. 1...liquid passage pipe, 2...liquid passage hole, 3...tsuba, 4
... air gap, 5 ... elastic tube, 6 ... valve,
7...Casing, 8...Annular groove, 9...O ring, 10...Threaded hole.

Claims (1)

[Claims] 1. An elastic tube is spirally wound around the outer periphery of a liquid passage tube which has a liquid passage hole in the circumferential wall and is provided with flanges on the outer periphery of both ends, is housed in the gap between the flanges at both ends, and is inserted into a right cylindrical casing. A pulsation prevention device characterized in that the elastic tube is provided with a valve for sealing pressurized gas so that the gap between the collar and the casing is liquid-tight.