JP2009127504A - Pulsation damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To damp pulsation by using an adjusting mechanism by releasing pressure of an air chamber to atmospheric pressure, by using the vertical movement of bellows for dividing a pulsation damping device into one compressed gas inflow control valve mechanism, a liquid chamber and the air chamber, since the pulsation generated when transferring liquid by a reciprocating pump, becomes a hindrance when providing an excellent quality when performing various works (cleaning and etching) by using a transfer liquid, that is, it is important that the pulsation is little and a flow rate and liquid pressure of the liquid are constant for the transfer liquid. <P>SOLUTION: This device has the same effect as a valve by the vertical movement of the bellows, by dividing the air chamber into a first air chamber into which compressed air enters and a second air chamber communicating with the atmosphere, by arranging a seal part in the bellows, and arranging a cam part on an inner surface of a body case. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a pulsation damping device that is disposed in a transfer liquid piping for liquid transfer of a reciprocating pump and attenuates harmful pulsation generated in the transfer liquid caused by the reciprocating pump.

  The conventional damping device that attenuates pulsation has a pulsation by providing a liquid chamber that temporarily stores the transferred liquid in the middle of the pipeline to attenuate the pulsation generated by the liquid transfer of the reciprocating pump. Some of them have a function of suppressing the pulsation caused by the reciprocating pump accompanying fluctuations in the flow rate and pressure of the transferred liquid by storing the liquid and sending it out again to the pipe line, such as a pulse damper or an accumulator.

However, there is a demand for a pulsation damping device as a device that can automatically suppress pulsation of the transfer liquid and pump pulsation caused by clogging of a filter installed in a pipe that automatically transfers liquid without using human hands. Yes, this device is provided.
As described in Patent Document 1 below, the transfer liquid is sent to a storage liquid chamber having a diaphragm and separated from the transfer liquid and the air chamber, and fluctuations in the transfer liquid pressure are sent to the air chamber to reduce pulsation. A device has been proposed.
JP-A-6-17752

  As described above, the type using two valves as in the conventional automatic pulsation damping device has many structural members, and is complicated and expensive. And providing a stable motion pulsation damping device of the type in which the pulsation damping device can be installed upside down.

  Unlike the conventional pulsation damping device, the object is to use one valve and attenuate the pulsation of the transfer liquid with a simple device. A chamber that separates the liquid chamber and the air chamber used in the pulsation damping device is a bellows. The bellows is provided with a seal portion and a cam portion is provided on the inner surface of the main body case to divide the air chamber into a first air chamber into which compressed air enters and a second air chamber communicating with the atmosphere, and to move the bellows up and down. The device has the same effect as the valve.

  According to the present invention, the pulsation attenuating device has a simple structure, and the convenience is improved by adopting a pulsation attenuating device having a structure that can be attached by an upside down attachment method.

  In other words, the structure is such that a single valve is used, and a part of the bellows separates the air chamber by a seal to act like a valve. Compared to a pulsation damping device that controls the same flow rate, Since the height can be lowered, it can be made small and inexpensive, so it has industrial value.

  FIG. 1 is a front view of a pulsation damping device, 1 is a main body case, 2 is a liquid transfer part of the pulsation damping device, and 3 in FIG. 5 is a liquid chamber due to an increase in the pressure of the transfer liquid and an increase in the liquid flow rate. Is expanded, the bellows 3 moves upward. Reference numeral 5 denotes a compressed gas inflow joint, 6 denotes an air communication valve, and 4 serves to divide the air chamber with a seal.

  FIG. 2 is a top view of the pulsation damping device. By fixing the pulsation damping device main body on the pedestal 9 with bolts 10a, 10b, 10c, and 10d, the pressure of the air chamber and the pressure of the transfer liquid can be adjusted. On the other hand, it retains its function as a pulsation damping device.

  The compressed gas is fed from the compressed gas inflow joint 5 into the air chamber of FIG. Since the ball 11 is always sealed by receiving the force of pressing the compressed gas by the compression spring 18 for the ball valve, the compressed gas does not flow into the air chamber 12. The 13 sliders are set so that they can move up and down freely. 13a is constituted by a part of the outer shape of a circle for guiding the vertical movement of the slider. In other words, the structure moves up and down in the cylinder.

  When the transfer liquid pressure is high and the flow rate is large, the bellows 3 expands so that the transfer liquid does not flow directly at the maximum pressure of the pump and the high-pressure transfer liquid does not flow rapidly into the transfer pipe. The transfer liquid in a high pressure state is stored inside the bellows 3.

  That is, when the transfer liquid flows into the bellows 3 by the pump pressure and pushes up the bellows 3, the 14d plate set in the bellows 3 pushes up the 13d portion of the slider 13 and pushes the ball 11 at the tip of 13c. By opening the valve and the compressed gas flowing into the 12 air chambers and compressing the bellows 3, it is possible to prevent the pressure of the transfer liquid inside the bellows 3 from being attenuated.

  That is, when the bellows expands due to an increase in the pressure of the transfer liquid, the compressed gas flows from the compressed gas inflow joint 5 from the ball valve, so that the pressure of the transfer liquid and the pressure of the compressed gas across the bellows 3 wall are reduced. It will be balanced. Next, when switching occurs due to the movement of the reciprocating pump, there are places where the pressure at which the liquid is sent drops, causing liquid pulsation.

At this time, the bellows 3 of the pulsation damping device is compressed with the pressure of the compressed gas pumped to cover the place where the pressure and flow rate of the transfer liquid are attenuated, and the pressure and flow rate of the transfer liquid are changed to the bellows 3. Pressurize and push out the stored transfer liquid to cover the pressure decrease that causes pulsation and secure the transfer liquid pressure and flow rate.

  FIG. 5 is a cross-sectional view when the bellows 3 is extended. A compressed gas that pushes up the ball valve 11 with the valve driving pin 13 and pushes the bellows 3 from the joint 5 flows in, so that the pressure balance with the transfer hydraulic pressure and the flow rate. Keep the balance by suppressing the decrease.

  FIG. 6 is a cross-sectional view showing a state where the pressure and flow rate of the air chamber 12 and the transfer liquid are balanced, and the air chamber 12 above the cam portion 1a is sealed. At this time, the pressure of the air chamber 12 and the pressure of the transfer liquid of the bellows 3 are balanced.

  In FIG. 7, the pressure of the transfer liquid in the bellows 3 is reduced, and the pressure of the transfer liquid is adjusted by the force by which the bellows 3 contracts due to the pressure in the air chamber 12. At the cam portion of 1a, the seal 4 comes under the cam portion, the seal of the air chamber 12 is broken, and atmospheric pressure is obtained through the hole 6. At this time, the pressure of the transfer liquid is lowered.

  Then, since the high-pressure transfer liquid is sent from the pump, the pressure of the transfer liquid increases and pushes up the bellows 3 to change from the state of FIG. 7 to the state of FIG. It works to automatically balance.

  Moreover, the stopper 17 of this pulsation damping device makes a hole 17a in the stopper 17 for avoiding the deformation of the bellows 3 due to the rapid contraction of the bellows 3. In order to avoid the excess air entering the transfer liquid chamber of the bellows 3 from preventing the transfer of the transfer liquid, this hole is connected to the 8 transfer liquid pipe through the hole 17a when the pulsation damping device is operated. By pumping, avoid the deterioration of the effectiveness of the pulsation damping device due to excess air.

  As shown in FIG. 7, when the bellows are rapidly lowered when the 12 air chambers are opened to the atmosphere, the liquid chamber may be crushed. To avoid this, 17 stoppers work to prevent the bellows 3 from being destroyed.

  This pulsation damping device is usually installed as shown in FIG. 3, but it is used as a pulsation damping device that operates with the influence of air inside the bellows being almost zero by mounting in the opposite direction as shown in FIG. It is also possible to do.

Front view Top view Right side view (upright mounting) Right side view (inverted mounting) Bellows extension cross section Bellows intermediate state sectional view Bellows compression sectional view Slider 13 perspective view

Explanation of symbols

1: Main body case 1a: Cam part 2: Liquid transfer part of pulsation damping device 3: Bellows 4: Seal 5: Joint for compressed gas inflow 6: Air communication hole 7, 8: Transfer liquid pipe 9: Base 10: Bolt 11: Ball valve 12: Air chamber 13: Slider 14: Plate 15: Claw plate 16: Claw screw 17: Stopper 18: Compression spring for ball valve

Claims (2)

  In a pulsation damping device that is arranged in a pump transfer liquid piping of a reciprocating pump and reduces the pulsation of pump transfer liquid, the case main body in the form of a sealed container and the liquid chamber and the air chamber separating the liquid chamber and the air chamber inside the case The transfer liquid from the pump is introduced into the bellows and the liquid chamber of the bellows to store the transfer liquid. A transfer line for delivering the transfer liquid is arranged, and a seal that separates the air chamber from the atmospheric pressure is arranged on the bellows. The air chamber is pushed up by a valve for introducing compressed gas and the valve when the bellows is extended. A pulsation damping device characterized in that when the slider and the seal come to a predetermined position, the slider is released to atmospheric pressure, and the pressure fluctuation of the liquid transferred from the pump is reduced.   2. The pulsation damping device according to claim 1, wherein a stopper is provided to prevent the bellows from contracting more than a certain amount, the stopper is hollow, and the inside of the bellows communicates with the transfer liquid outlet. apparatus.

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