JPH02186101A - Pulsation absorbing device - Google Patents

Abstract

PURPOSE:To improve responsiveness of movable separate members by providing an air supply valve which starts supply of compressed gas to air chambers by sufficient pressing of an air supply control rod pressed by the movable separate members, and an exhaust orifice. CONSTITUTION:Liquid which is forcibly fed flows from a liquid inlet 35 and out to a liquid outlet 38 via liquid chambers 23 and 24. Pulsation of the external pump liquid is by absorbed by movable separate members 16 and 17, and while this pulsation is absorbed, compressed gas pressed into air chambers 21, 22 and 25 is leaked to the outside through a throttle small hole 65 of an orifice 64. As air pressure in the air chambers 21, 22 and 25 is gradually lowered by extracting air through the small hole 65, the members 16 and 17 are moved to the side of the air chambers 22 and 25 with absorbing pulsation, and immediately before the limit of movement, a rod part 46 of an air supply valve 43 is pressed up by an air supply control rod 51 which moves up with the member 16. An O ring 44 of the valve 43 is raised to open a valve seat 45, and compressed air is pressed and supplied to the air chambers 21, 22 and 25.

Description

[Detailed description of the invention] (Objective of the invention) (Industrial application field) The present invention absorbs and smooths pulsations (ripples) that occur in hydraulic pressure output from diaphragm pumps, piston pumps, boosters, etc. It is surrounded by a pulsation absorbing device.

(Prior art) Generally, an accumulator has an air chamber and a liquid chamber separated through a movable separation member (hereinafter referred to as a diaphragm) in the main body, and the gas filled in the air chamber expands and contracts. This absorbs and smoothes the pulsation of the liquid pressure supplied into the liquid chamber.

In most conventional 7 cumulators, when the air chamber is filled with compressed gas until it reaches a certain pressure, the air chamber is usually sealed so that the electrical pressure is maintained.

Such a sealed air chamber type accumulator has the disadvantage that it cannot respond to large changes in hydraulic pressure. In other words, the normal hydraulic pressure pulse IJ (ripple) can be absorbed by the expansion and contraction of the air chamber as described above, but the diaphragm to do this! ! Since the operating range is limited, there is a problem in that it is not possible to respond to changes in hydraulic pressure that exceed the range of variation.

As a means to deal with such problems, the
There is a device shown in Japanese Patent No.-6725. In the device described in this publication, a pair of valve operating plates are integrally provided on the diaphragm via a rod, and the air supply valve or the exhaust valve is opened by the pair of operating plates.

For example, if the air pressure in the air chamber is too high and the diaphragm is too biased toward the liquid chamber, and the pulsation absorbing function cannot be fully achieved, one operation panel opens the exhaust valve and the air pressure in the air chamber is reduced. The diaphragm is returned to a position where it can fully inflate and deflate. On the other hand, if the air pressure is too low and the diaphragm is too biased toward the air chamber to perform its pulsation absorption function, the air supply valve is activated by the other control panel and the air pressure in the air chamber is increased. The diaphragm is returned to a position where it can fully inflate and deflate.

(Problems to be Solved by the Invention) As described above, the device described in the above publication requires a mechanism for controlling not only air supply but also exhaust air.

In addition, in order to operate the air supply valve or the exhaust valve from both below and above using a pair of valve operating plates, a long valve operating plate holder 40 that passes through the main body of the device must be integrated into the diaphragm. This long and heavy rod slows down the movement (vibration) of the diaphragm that accompanies the pulsation of hydraulic pressure, which is unfavorable for the pulsation absorption effect.

The present invention aims to reduce the length and weight of the air supply control rod attached to the movable separation member by abolishing the conventional exhaust valve, and to improve the responsiveness of the movable distribution member regarding pulsation absorption vibration. That's what I want to do.

(Structure of the Invention) (Means for Solving the Problems) In the present invention, an air chamber 21.22 and a liquid chamber 23 are formed separately through a movable dispensing member 16 in an apparatus main body 11, 12, 13, In the pulsation absorbing device, the pulsation of the liquid pressure supplied to the liquid chamber 23 is smoothed by the expansion and contraction of the gas filled in the air chambers 21 and 22.
Air supply υ pressed by the movable separation member 16 to the air chamber side of
Itllll rod 51 is provided, and an air supply valve 43 which starts supplying compressed gas to air chamber 21.22 by sufficient suppression of this air supply control rod 51;
The exhaust orifice 64 that continues to exhaust air from the air chamber 2 through the small throttle hole 65 is a pulsation absorbing device provided for the air chamber 21.

(Function) According to the present invention, as the air pressure in the air chamber 21.22 decreases due to the gradual removal of air from the air orifice 64, the movable separation member 16 gradually moves the air chamber 21.22 while performing pulsation absorption vibration.
Move to the side. Just before this movement reaches its limit, the air supply valve 43 is sensed by the air supply control rod 51, which moves together with the movable separation part I416, and compressed gas is supplied to the air chamber 21.22 via this air supply valve 43. As a result, the internal pressure of the air chambers 21 and 22 increases, and the movable separating member 16 is pushed back toward the liquid chamber 23, vibrates around a position where the air pressure and liquid pressure are approximately balanced, and absorbs the pulsation of the liquid. Even during this operation, the plowing orifice 64 is gradually vented continuously. In such an air supply/exhaust cycle, for example,
When the average value of oil pressure is high, the air supply cycle is shortened to automatically respond to the hydraulic pressure.

(Example) Hereinafter, the present invention will be explained in detail with reference to an example shown in FIGS. 1 and 2. FIG. 1 shows a double diaphragm type pulsation absorbing device, and FIG. 2 shows a single diaphragm type pulsation absorbing function.

First, the double diaphragm type pulsation absorbing device shown in FIG. 1 will be explained. The apparatus main body 11, the apparatus main body 12, the apparatus main body 13, and the apparatus main body 14 are integrated by a plurality of tie rods not shown in the figure. Reference numeral 15 denotes a cap fitted onto a nut screwed onto both ends of the tie loft. A movable separation member (diaphragm) 16 is sandwiched between the device main body 12 and the device main body 13,
Further, a movable separating member (die 17 flam) 17 is sandwiched between the device main body 13 and the device main body 14.

An air chamber 21 is formed inside the device main body 11, an air chamber 22 is defined in the device main body 12 by a movable separation member 16, and an upper liquid chamber 23 and a lower liquid chamber 2 are formed in the device main body 13.
Further, an air chamber 25 is defined in the U-mount main body 14 by a movable separation member 17.

The air chamber 21 and the air chamber 22 communicate with each other through a plurality of holes 31 provided in the device main body 12, and further, the air chamber 21 and the air chamber 2
5 refers to the hole 32 provided in the 5niff main body 11, the connection l! fitted to the device main body IT, 12.13.14! 3
3. They are communicated through a hole 34 provided in the device body 14.

A liquid inlet 35 is provided on one side of the device main body 13, and this liquid inlet 35 connects to the upper and lower liquid chambers 23 through the IL 36.
24, and is connected to the main body 13 of the device through a rough hole 37.
It communicates with a liquid outlet 38 provided on the other side.

An air supply port 40 is provided at the center of the upper part of the device main body 11. An air supply union 41 is screwed into the air supply port 40, and a spring 42 built in the lower part of the air supply union 41 causes the device main body 11 to Air supply valve 43 fitted in the center part
is pressed downward, and the O fitted into this air supply valve 43 is
A ring 44 is engaged with the valve seat 45. A rod portion 46 is integrally formed with the air supply valve 43. A ventilation gap 41 is provided at a portion where the rod portion 46 and the device main body 11 fit together.

The rod portion 46 of the air supply valve 43 is fitted with the hole 52 of the air supply control rod 51 which is fitted into the center of the device main body 12 so as to be movable up and down. The disk 53 is in contact with the upper surface of the central portion of the movable separation member 16. This disk 53 is connected to the device main body 12.
The four parts 54 formed above the air chamber 22 are pushed up and fitted together.

￥AIi! A screw hole 61 for air flow from the air chamber 21 is provided in the body of the wooden rest 11, a screw portion 63 of a silencer 62 is screwed into this screw hole 61, and the inside of this screw portion 63 is screwed into the screw hole 61. An exhaust orifice 64 is screwed into the.

This exhaust orifice 64 is provided with a small throttle hole 65 .

The nuts of the ties are tightened by sandwiching the plates 71, 72 on the top and bottom of the device and the base 13 on the lower side.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

The liquid pumped by the external pump enters through the liquid inlet 35, passes through the liquid chambers 23, 24, and flows out to the liquid outlet 38.

This pump fluid has periodic pressure fluctuations, and its pulse! v
l (ripple) is absorbed by the movable separating member 16,17, and the hydraulic pressure is smoothed. For example, liquid chambers 23, 24
When the liquid pressure in the liquid chamber 23.24 increases, the movable separation part U 16°11 bulges toward the air chamber 22.25, suppressing the rise in liquid liquid, and when the liquid pressure in the liquid chamber 23.24 decreases. In this case, the movable separation members 16 and 17 are contracted by the air pressure in the air chambers 22 and 25, so that the drop in oil pressure is suppressed.

While such a pulsation absorbing effect is provided, the air chamber 21.
The compressed gas injected into the inside of the exhaust orifice 64 always leaks to the outside, albeit only a small amount, through the small throttle hole 65 of the exhaust orifice 64. The U sound accompanying the gas expansion generated at this time is muffled by the silencer 62. The air chamber 2 is gradually vented through the small throttle hole 65 of the exhaust orifice 64.
As the air pressure at 1.22.25 decreases, the movable separation member 16.17 gradually moves toward the air chamber 22.25 while absorbing pulsation. Just before this movement reaches its limit, it moves upward together with the upper movable separation member 16! Air supply valve 43 by IJ air supply 1111110 tube 51
The O-rad part 46 of the air supply union 41 is pushed up, the O-ring 44 of the air supply valve 43 is raised, the valve seat 45 is exposed, and the compressed gas (air) being pressurized and supplied to the air supply union 41 is
It is pressurized and supplied to the air chamber 21.22° 25 through the opened valve seat 45 and the ventilation hole 11147. As a result, the internal pressure in the air chambers 21, 22° 25 increases, and the movable separation member 16, 17 is pushed back toward the liquid chambers 23, 24, vibrates around the position where the air pressure and liquid pressure are almost balanced, and the liquid Absorbs pulsation. Even during this operation, air is gradually removed from the air orifice 64 continuously.

In such a supply/exhaust cycle, when the average value of the liquid pressure is high (for example, the pump discharge pressure is n), the exhaust pressure acting on the gas from the movable separation member 16, 17 is also high, and the air is exhausted from the exhaust orifice 64. Since the flow rate is high, the air supply cycle is automatically shortened to automatically respond to liquid pressure.

In addition, when the average value of the liquid pressure is low (pump discharge pressure is low), the exhaust pressure acting on the gas from the movable separation member 16, 17 is also low, and the amount of air removed FiLm from the exhaust orifice 64 is also small, so the air supply cycle By automatically lengthening, it can automatically respond to low fluid pressure.

Next, the single diaphragm type pulsation absorbing device shown in FIG. 2 will be explained. The basic structure and operation of this single diaphragm type are similar to the pulsation absorption i! of the double diaphragm type shown in FIG. Since it is the same as the basic I
Explanation regarding the structure and operation will be omitted.

A valve fitting part 81 is protruded from the center of the upper part of the A-mounted main body 11, and a valve body 82 is screwed into this valve fitting part 81 from below. The O-ring 44 of the air valve 43 is locked. On the other hand, the rod portion 46 of this air supply valve 43
The air supply control rod 51 for pushing up the air supply control rod 51 is formed to be extremely short, and a flange portion 83 integrally formed on the upper end of the air supply control rod 51 faces the Orad vA46 with a gap therebetween. Then, this flange af183 pushes up the 0 rad portion 46 of the air supply valve 43.

(Effects of the Invention) According to the present invention, by installing an exhaust orifice, the conventional exhaust valve can be eliminated. As a result, there is no need to provide an exhaust valve operating mechanism that interlocks with the movable separation member, and the air supply & lI control valve attached to the movable separation member can be made shorter and lighter. This leads to an improvement in the responsiveness of the movable separation member regarding pulsation-absorbing imaging.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the pulsation absorbing device of the present invention, and FIG. 2 is a sectional view showing another embodiment. it, 12.13...Device main body, 16...Movable separation member, 21.22...Air chamber, 23...Liquid chamber, 43...Air supply valve, 51...Air supply control rod, 64... Exhaust orifice, 65...small aperture hole.

Claims (1)

[Claims] (1) An air chamber and a liquid chamber are formed separately within the device body via a movable separation member, and the expansion and contraction of the gas filled in the air chamber smooths out the pulsations in the liquid pressure supplied to the liquid chamber. In the pulsation absorbing device, an air supply control rod that is pressed by the movable separation member is provided on the air chamber side of the movable separation member, and supply of compressed gas to the air chamber is started by sufficient pressure of the air supply control rod. A pulsation absorbing device characterized in that the air chamber is provided with an air supply valve that continues to emit a small amount of air from the air chamber through a small throttle hole.