JP4088963B2 - Pressure amplifier - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure amplifying device, and more particularly to a control relay that is a component of a valve positioner.
[0002]
[Prior art]
The pressure amplifying device in the prior art is a device that receives supply fluid pressure Ps and input fluid pressure Pn, and amplifies the fluid pressure by changing the output fluid pressure Po according to the change of the input fluid pressure Pn.
[0003]
This pressure amplifying device is a component such as a valve positioner that controls the air pressure of a pneumatic valve. In order to accurately drive a control valve (control valve) that can adjust the opening degree against disturbance, This is used for a pilot relay or the like that controls the change amount of the output fluid pressure Po at a constant magnification with respect to the change amount of the input fluid pressure Pn.
[0004]
As shown in FIG. 4, the pressure amplifying device includes a valve body 111 having a hollow interior, a moving body 112 disposed in the cavity of the valve body 111, and a first body that maintains the moving body 112 inside the valve body 111. 1st to 4th diaphragms 113 to 116, supply pressure chamber 117, bias chamber 118, input pressure chamber 119, output pressure chamber 120, exhaust pressure chamber 121, feedback chamber 122, valve plug ppt, A spring 124, a first opening / closing means 133, and a second opening / closing means 134 are provided.
[0005]
The valve body 111 is a housing part (casing) that constitutes the apparatus body. The valve body 111 has a supply port 123 for supplying a fluid such as air to the supply pressure chamber 117, an input port 124 a for allowing a fluid such as air to flow into the input pressure chamber 119, and a fluid from the output pressure chamber 120. An output port 124b, an exhaust port 125 through which fluid flows out from the exhaust pressure chamber 121, a flow path 126 connecting the supply pressure chamber 117 and the bias chamber 118, and a flow path connecting the output pressure chamber 120 and the feedback chamber 122. 127, a flow path 128 that connects the supply pressure chamber 117 and the output pressure chamber 120, and an inflow hole (bleed hole) 129 that connects the supply pressure chamber 117 and the output pressure chamber 120 are formed.
[0006]
The valve body 111 houses a moving body 112, first to fourth diaphragms 113 to 116, a valve plug ppt, and a spring 124.
The moving body 112 is a member that moves by elastic deformation of the first to fourth diaphragms 113 to 116.
[0007]
In the moving body 112, a flow path 130 a that connects the output pressure chamber 120 and the exhaust pressure chamber 121 is formed.
The moving body 112 is supported by the first to fourth diaphragms 113 to 116 so as to be movable in the valve body 111. When the first to fourth diaphragms 113 to 116 are elastically deformed, the direction of the arrow A and the arrow B Move in the direction.
[0008]
The 1st-4th diaphragms 113-116 are the membrane plates which connect the valve main body 111 and the moving body 112, and support this moving body 112 movably.
[0009]
The first diaphragm 113 receives the output fluid pressure Po on one surface side and receives the supply fluid pressure Ps on the other surface side and elastically deforms.
[0010]
The second diaphragm 114 receives the supply fluid pressure Ps on one surface side and elastically deforms upon receiving the input fluid pressure Pn on the other surface side, and has a pressure receiving area smaller than that of the lth diaphragm 113. .
[0011]
The third diaphragm 115 is an input diaphragm that is elastically deformed by receiving the input fluid pressure Pn on one surface side and receiving the exhaust fluid pressure Pe on the other surface side, and has a larger pressure receiving area than the second diaphragm 114. Has been.
[0012]
The fourth diaphragm 116 is a feedback diaphragm that is elastically deformed by receiving the exhaust fluid pressure Pe or atmospheric pressure on one surface side and receiving the output fluid pressure Po on the other surface side. Since this fourth diaphragm 116 has a larger pressure receiving area than the first diaphragm 113, a force corresponding to the difference in pressure receiving area between the fourth diaphragm 116 and the first diaphragm 113 acts on the moving body 112. Sometimes it functions to move the moving body 112 in the direction of arrow B.
[0013]
The supply pressure chamber 117 is a chamber that receives the supply fluid pressure Ps. The supply pressure chamber 117 is connected to the supply port 123. When air is supplied from the supply port 123, the supply pressure chamber 117 receives the supply fluid pressure Ps therein. The supply pressure chamber 117 is formed on the end side of the valve main body 111 and houses the spring 124 therein.
[0014]
The bias chamber 118 is a chamber that is located outside the third diaphragm 115 and the valve plug ppt and receives the supply fluid pressure Ps. The bias chamber 118 is partitioned by a pair of first and second diaphragms 113 and 114, and is connected to the supply pressure chamber 117 through the flow path 126, so that the supply chamber has the same size as the supply pressure chamber 117. The fluid pressure Ps is received inside. Further, the bias chamber 118 is located between and adjacent to the input pressure chamber 119 and the feedback chamber 122.
[0015]
The bias chamber 118 having such a configuration corresponds to a difference in pressure receiving area between the first diaphragm 113 and the second diaphragm 114 because the first diaphragm 113 has a larger pressure receiving area than the second diaphragm 114. It functions as an air spring that constantly applies a pressing force to the moving body 112 and presses the moving body 112 in the B direction.
[0016]
The input pressure chamber 119 is a chamber that receives the input fluid pressure Pn, and is positioned between and adjacent to the bias chamber 118 and the exhaust pressure chamber 121, and between the bias chamber 118 and the valve plug ppt. Located between. The input pressure chamber 119 is partitioned by a pair of second and third diaphragms 114 and 115, and receives the input fluid pressure Pn inside when air flows in from the inlet 124a.
[0017]
In the input pressure chamber 119 having such a configuration, since the third diaphragm (input diaphragm) 115 has a larger pressure receiving area than the second diaphragm 114, the pressure received by the second diaphragm 114 and the third diaphragm 115 is received. When a force corresponding to the difference in area is applied to the moving body 112, the moving body 112 functions to move in the arrow A direction.
[0018]
The output pressure chamber 120 is a chamber in which the output fluid pressure Po changes when the input fluid pressure Pn changes, and is a space partitioned by the fourth diaphragm 116, the moving body 112, and the valve body 111. In the output pressure chamber 120, when the valve plug ppt opens the flow path 128, air flows from the supply pressure chamber 117 through the gap between the valve plug ppt and the flow path 128 and receives the output fluid pressure Po. The output pressure chamber 120 discharges air from the output port 124b to an actuator (not shown).
[0019]
The output pressure chamber 120 is disposed apart from the input pressure chamber 119, and is disposed between and adjacent to the supply pressure chamber 117 and the exhaust pressure chamber 121.
As shown in FIG. 4, an exhaust pressure chamber 121 is disposed between the input pressure chamber 119 and the output pressure chamber 120.
[0020]
The exhaust pressure chamber 121 is a room for discharging air, and is partitioned by a pair of third and fourth diaphragms 115 and 116, and the air flowing in from the flow paths 130a and 130b is discharged from the exhaust port 125 to the atmosphere. Let The exhaust pressure chamber 121 is located between the input pressure chamber 119 and the output pressure chamber 120 and is disposed adjacent to these.
[0021]
The feedback chamber 122 is a chamber having a first diaphragm 113 that receives the output fluid pressure Po, is partitioned by the valve body 111 and the first diaphragm 113, and is connected to the output pressure chamber 120 through the flow path 127. Therefore, the output fluid pressure Po having the same size as that of the output pressure chamber 120 is received inside.
[0022]
The bias chamber 118 and the feedback chamber 122 are located outside the third diaphragm 115 and the valve plug ppt.
[0023]
The valve plug ppt is a poppet valve that opens a flow path 128 that connects the supply pressure chamber 117 and the output pressure chamber 120, an exhaust valve portion 131 that opens and closes the flow path 130 a, and a supply valve portion 132 that opens and closes the flow path 128. And are formed.
[0024]
The valve plug ppt is disposed and accommodated between the supply pressure chamber 117 and the output pressure chamber 120 in a state of penetrating the flow path 128, the input fluid pressure Pn increases, and the moving body 112 is moved to the arrow A. When moving in the direction, the flow path 128 is opened so that the output fluid pressure Po increases.
[0025]
The spring 124 is a pressing member that presses the valve plug ppt. The valve plug ppt is closed so that the exhaust valve part 131 of the valve plug ppt closes the flow path 130a and the supply valve part 132 closes the flow path 128. Always press in the direction of arrow B. The spring 124 is compressed when the input fluid pressure Pn increases and the moving body 112 moves in the direction of arrow A while pressurizing the valve bracket 123.
[0026]
The l-th opening / closing means 133 is provided in the valve body 111 and opens / closes the flow path 127.
In this case, a needle valve is used as the l-th opening / closing means 133 to open / close the flow path 127.
[0027]
The second opening / closing means 134 is provided in the flow path 127a between the first opening / closing means 133 and the feedback chamber 122 or in the feedback chamber 122, and opens to the atmosphere when the l-th opening / closing means 133 is closed. When the opening / closing means 133 is opened, it is closed.
[0028]
Next, the operation of the pressure amplifying apparatus having the above-described configuration will be described.
In order to make the explanation easy to understand, first, the case where the first opening / closing means 133 is open and the second opening / closing means 134 is closed will be described.
[0029]
(Equilibrium state)
As shown in FIG. 4, when air is supplied from the supply port 123 to the supply pressure chamber 117, the supply pressure chamber 117 and the bias chamber 118 are connected to each other by the flow path 126. 118 receives the supply fluid pressure Ps.
Further, air flows into the input pressure chamber 119 from the input port 124a, and the input pressure chamber 119 receives the input fluid pressure Pn.
[0030]
When air slightly flows into the output pressure chamber 120 from the supply pressure chamber 117 through the inflow hole 129, the output pressure chamber 120 and the feedback chamber 122 are connected by the flow paths 127 and 127a. Chamber 122 receives output fluid pressure Po.
[0031]
At this time, the spring 124 presses the valve plug ppt in the direction of arrow B, and the supply valve portion 132 closes the flow path 128, but there is a slight gap between the exhaust valve portion 131 and the flow path 130a. Is formed.
[0032]
As a result, the air flowing into the output pressure chamber 120 from the supply pressure chamber 117 through the flow path 129 flows into the exhaust pressure chamber 121 from the gap between the exhaust valve portion 131 and the flow path 130a, and is mechanically stable. It is in an equilibrium state.
[0033]
(Output increase)
FIG. 5 is an operation explanatory diagram showing a state when the output fluid pressure Po is increased in the pressure amplifying device.
When the air pressure flowing into the input pressure chamber 119 from the input port 124a increases, the input fluid pressure Pn received by the input pressure chamber 119 increases.
[0034]
Since the pressure receiving area of the third diaphragm 115 is larger than the pressure receiving area of the second diaphragm 114, the second and third diaphragms 114 and 115 stagnate by a force corresponding to the difference between these pressure receiving areas, and the moving body 112 moves in the direction of arrow A.
[0035]
On the other hand, when the bias chamber 118 receives the supply fluid pressure Ps, since the pressure receiving area of the first diaphragm 113 is larger than the pressure receiving area of the second diaphragm 114, the force corresponding to the difference between these pressure receiving areas is indicated by the arrow B. It acts on the moving body 112 as a resistance force in the direction.
[0036]
The moving body 112 pressurizes the valve plug ppt while compressing the spring 124 against the pressing force of the spring 124, the exhaust valve portion 131 closes the flow path 130a, and the moving body 112 and the valve plug ppt. Move together in the direction of arrow A.
[0037]
As a result, the valve plug ppt gradually opens the flow path 128, air flows into the output pressure chamber 120 from the supply pressure chamber 117 through the gap between the supply valve portion 132 and the flow path 128, and the output pressure chamber 120 The received output fluid pressure Po increases.
[0038]
When the air pressure flowing into the output pressure chamber 120 from the flow path 128 increases, the output fluid pressure Po received by the feedback chamber 122 also increases, and the increase in the output fluid pressure Po is fed back to the feedback chamber 122.
[0039]
Since the pressure receiving area of the fourth diaphragm 116 is smaller than the pressure receiving area of the first diaphragm 113, a force corresponding to the difference between these pressure receiving areas acts on the moving body 112 as a resistance force in the arrow B direction.
Thus, when the input fluid pressure Pn increases, the output fluid pressure Po increases at a constant magnification.
[0040]
(Output reduction)
FIG. 6 is an operation explanatory diagram showing a state when the output fluid pressure Po is decreased.
[0041]
When the air pressure flowing into the input pressure chamber 119 from the input port 124a decreases and the input fluid pressure Pn received by the input pressure chamber 119 decreases, this corresponds to the difference between the pressure receiving areas of the second and third diaphragms 114 and 115. The force decreases and the force for moving the moving body 112 in the direction of arrow A decreases.
[0042]
On the other hand, the bias chamber 118 receives the supply fluid pressure Ps, and a force corresponding to the difference between the pressure receiving areas of the first and second diaphragms 113 and 114 acts in the arrow B direction, so that the moving body 112 moves in the arrow B direction. Moving.
For this reason, the valve plug ppt and the moving body 112 are separated from each other, and the exhaust valve portion 131 opens the flow path 130a.
[0043]
As a result, air flows into the exhaust pressure chamber 121 from the output pressure chamber 120 through the flow paths 130a and 130b, and the air in the exhaust pressure chamber 121 is discharged into the atmosphere from the exhaust port 125, and the output pressure chamber 120 and the feedback chamber are exhausted. The output fluid pressure Po received by 122 decreases.
[0044]
Next, when the first opening / closing means 133 is closed and the second opening / closing means 134 is open, the feedback chamber 122 is only opened to the atmosphere, and there is almost no difference in operation. The description of the operation is omitted.
However, since there is a difference in gain, the occurrence of a gain difference due to switching between opening and closing of the first opening / closing means 133 and the second opening / closing means 134 will be described below.
[0045]
First, when the l-th opening / closing means 133 is open and the second opening-closing means 134 is closed, that is, when the output fluid pressure Po is introduced into the feedback chamber 122, the area of the l-th diaphragm 113, By reducing the difference in the area of the four diaphragms 116, a high gain can be obtained.
[0046]
When the l-th opening / closing means 133 is closed and the second opening-and-closing means 134 is open, that is, when the feedback chamber 122 is opened to the atmosphere, the gain is reduced by the amount that the area of the l-th diaphragm 113 does not exist. .
That is, two kinds of gains are obtained by the operation of the first opening / closing means 133 and the second opening / closing means 134.
[0047]
Next, since the input fluid pressure Pn and the output fluid pressure Po increase as the supply fluid pressure Ps increases, the force balance cannot be obtained. However, since the bias chamber 118 and the feedback chamber 122 are provided, the force balance is provided. And supply pressure fluctuations can be compensated.
However, when a low gain is employed, the feedback chamber 122 is at atmospheric pressure, so that fluctuations in supply pressure cannot be compensated.
[0048]
[Patent Document 1]
Japanese Patent Application No. 2002-004483 (Pages 8-10)
[0049]
[Problems to be solved by the invention]
However, in the pressure amplifying apparatus shown in the prior art, a feedback chamber is provided, which is composed of an output pressure chamber, an input pressure chamber, a supply pressure chamber, a bias chamber, and a feedback chamber. Although two characteristics of high gain and low gain can be obtained by mounting, there is a problem that supply pressure fluctuation compensation that changes the output at a constant rate functions only at high gain.
[0050]
Therefore, two characteristics of high gain and low gain can be obtained for the control relay constituted by five chambers, that is, an output pressure chamber, an input pressure chamber, a supply pressure chamber, a bias chamber, and a feedback chamber, There is a problem that must be solved in a configuration that allows supply pressure fluctuation compensation to function in either of the two gains.
[0051]
[Means for Solving the Problems]
In order to solve the above problems, a pressure amplifying apparatus according to the present invention is configured as follows.
[0052]
[Means for Solving the Problems]
  According to the first aspect of the present invention, the supply fluid and the input fluid are supplied to a chamber in which a space between the valve main body and the moving body incorporated in the valve main body is partitioned by a diaphragm, and according to a change in pressure of the input fluid. In the pressure amplification device that changes the pressure of the output fluid,
A supply pressure chamber to which the supply fluid is supplied; an output pressure chamber adjacent to the supply pressure chamber; partitioned by the moving body and a sixth diaphragm; and adjacent to the output pressure chamber; An exhaust pressure chamber partitioned by a fifth diaphragm, a first gain switching chamber adjacent to the exhaust pressure chamber and partitioned by the moving body and a fourth diaphragm, and the first gain switching chamber And an input pressure chamber partitioned by the moving body and the third diaphragm, and a second gain switching chamber partitioned by the moving body and the second diaphragm, adjacent to the input pressure chamber. A bias chamber adjacent to the second gain switching chamber and partitioned by the moving body and the first diaphragm; and adjacent to the bias chamber and partitioned by the moving body and the first diaphragm. Feedback room and Following the moving body that moves in accordance with the input fluid supplied to the input pressure chamber, it moves between the output pressure chamber and the supply pressure chamber, and changes the pressure output from the output pressure chamber. A valve plug,
The first and second gain switching chambers supply input fluid pressure to the first and second gain switching chambers when the gain is high, and supply atmospheric pressure to the first gain switching chamber when the gain is low. And a supply fluid pressure is supplied to the second gain switching chamber.
[0053]
As described above, by providing the first and second gain switching chambers for switching the gain, it is possible to switch between the high gain and the low gain, and the function of compensating the supply pressure fluctuation even at a low gain. Can be made.
[0054]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a pressure amplifying device according to the present invention will be described with reference to the drawings.
[0055]
The pressure amplifying device according to the present invention receives the supply fluid pressure Ps and the input fluid pressure Pn, and changes the output fluid pressure Po according to the change of the input fluid pressure Pn, similarly to the pressure amplifying device described in the prior art. Thus, the device amplifies the pressure of the fluid.
This pressure amplifying device is a component such as a valve positioner that controls the air pressure of a pneumatic valve. In order to accurately drive a control valve (control valve) that can adjust the opening degree against disturbance, This is used for a pilot relay or the like that controls the change amount of the output fluid pressure Po at a constant magnification with respect to the change amount of the input fluid pressure Pn.
[0056]
As shown in FIG. 1, such a pressure amplifying device includes a valve body 11, a moving body 12, first to sixth diaphragms 13 to 18, a supply pressure chamber 19, a bias chamber 20, and an input pressure. The chamber 21, the output pressure chamber 22, the exhaust pressure chamber 23, the feedback chamber 24, the first gain switching chamber 25, the second gain switching chamber 26, the valve plug 27, and the spring 28 are generally configured. Has been.
[0057]
The valve body 11 is a housing portion (casing) that constitutes the apparatus body, and includes a supply port 31 that supplies a fluid such as air to the supply pressure chamber 19, an output port 32 that causes the fluid to flow out from the output pressure chamber 22, and a drain. An exhaust port 33 that discharges fluid from the atmospheric pressure chamber 23, a first gain switching port 34 that supplies an input fluid pressure Pn or atmospheric pressure to the first gain switching chamber 25, and an input that causes air to flow into the input pressure chamber 21. A second gain switching port 36 for supplying the input fluid pressure Pn or the supply fluid pressure Ps to the second gain switching chamber 26, a bias port 37 for supplying the supply fluid pressure Ps to the bias chamber 20, and a feedback. A feedback port 38 for supplying the output fluid pressure Po to the chamber 24 is provided.
[0058]
The valve body 11 further includes a moving body 12 supported by first to sixth diaphragms 13 to 18 in an upper hollow portion, and the moving body is provided at a partition portion between the supply pressure chamber 19 and the output pressure chamber 22. The valve plug 27 is accommodated so as to be movable by a spring 28 in accordance with the central axis of the twelve.
[0059]
The moving body 12 is moved by elastic deformation of the first to sixth diaphragms 13 to 18, and is movably supported in the valve body 11 by the first to sixth diaphragms 13 to 18. When the first to sixth diaphragms 13 to 18 are elastically deformed, they move in the direction of arrow A and the direction of arrow B.
[0060]
The 1st-6th diaphragms 13-18 are the membrane plates which connect the valve main body 11 and the moving body 12, and support this moving body 12 movably.
[0061]
The first diaphragm 13 receives the input fluid pressure Pn of the feedback chamber 24 on one surface side and receives the supply fluid pressure Ps of the bias chamber 20 on the other surface side and elastically deforms.
[0062]
The second diaphragm 14 receives the supply fluid pressure Ps of the bias chamber 20 on one surface side and receives the input fluid pressure Pn or the supply fluid pressure Ps of the second gain switching chamber 26 on the other surface side, and elastically deforms. To do.
[0063]
The third diaphragm 15 receives the input fluid pressure Pn or the atmospheric pressure of the second gain switching chamber 26 on one surface side and receives the input fluid pressure Pn of the input pressure chamber 21 on the other surface side and elastically deforms. .
[0064]
The fourth diaphragm 16 is elastically deformed by receiving the input fluid pressure Pn of the input pressure chamber 21 on one surface side and the input fluid pressure Pn or the atmospheric pressure of the first gain switching chamber 25 on the other surface side. .
[0065]
The fifth diaphragm 17 receives the input fluid pressure Pn or atmospheric pressure of the first gain switching chamber 25 on one surface side, and elastically deforms upon receiving the exhaust fluid pressure Pe of the exhaust pressure chamber 23 on the other surface side. .
[0066]
The sixth diaphragm 18 receives the exhaust fluid pressure Pe of the exhaust pressure chamber 23 on one surface side and elastically deforms upon receiving the output fluid pressure Po of the output pressure chamber 22 on the other surface side.
[0067]
The supply pressure chamber 19 is a chamber that receives the supply fluid pressure Ps, and is connected to the supply port 31. When air is supplied from the supply port 31, the supply pressure chamber 19 receives the supply fluid pressure Ps inside.
The supply pressure chamber 19 is formed on the end side of the valve body 11 and is configured to accommodate a spring 28 therein.
[0068]
The bias chamber 20 is a chamber that receives the supply fluid pressure Ps, is partitioned by a pair of first and second diaphragms 13 and 14, and receives the supply fluid pressure Ps having the same size as the supply pressure chamber 19 inside. .
The bias chamber 20 is located between the second gain switching chamber 26 and the feedback chamber 24 and is disposed adjacent to them.
[0069]
Since the first diaphragm 13 has a larger pressure receiving area than the second diaphragm 14, the bias chamber 20 moves a pressing force corresponding to the difference in pressure receiving area between the first diaphragm 13 and the second diaphragm 14. It always acts on the body 12 and functions as an air spring that the moving body 12 presses in the B direction.
[0070]
The input pressure chamber 21 receives the input fluid pressure Pn, is partitioned by a pair of third and fourth diaphragms 15 and 16, and receives the input fluid pressure Pn when air flows in from the input port 35. .
The input pressure chamber 21 is located between the second gain switching chamber 26 and the first gain switching chamber 25 and is disposed adjacent to them.
In this input pressure chamber 21, since the fourth diaphragm (input diaphragm) 16 has a larger pressure receiving area than the third diaphragm 15, a force corresponding to a difference in pressure receiving area with the third diaphragm 15 is applied to the moving body 12. When acted on, the moving body 12 functions to move in the arrow A direction.
[0071]
The output pressure chamber 22 is a space in which the output fluid pressure Po changes when the input fluid pressure Pn changes. The output pressure chamber 22 is formed by the sixth diaphragm 18, the exhaust valve portion 41 on the bottom side of the moving body 12 and the head side of the valve body 11. It is partitioned.
In the output pressure chamber 22, when the valve plug 27 opens the flow path 43, air flows from the supply pressure chamber 19 through the gap between the valve plug 27 and the flow path 43 and receives the output fluid pressure Po. The output pressure chamber 22 discharges air from the output port 32 to an actuator (not shown).
[0072]
The output pressure chamber 22 is disposed so as to be separated from the input pressure chamber 21, and is disposed between and adjacent to the supply pressure chamber 19 and the exhaust pressure chamber 23.
[0073]
The exhaust pressure chamber 23 is an empty space for discharging air, and is partitioned by a pair of fifth and sixth diaphragms 17 and 18, and air flowing in from the flow paths 44 a and 44 b is discharged from the exhaust port 33 into the atmosphere. To discharge. The exhaust pressure chamber 12 is located between the first gain switching chamber 25 and the output pressure chamber 22 and is disposed adjacent to them.
[0074]
The feedback chamber 24 is a chamber having the first diaphragm 13 that receives the output fluid pressure Po from the feedback port 38. The feedback chamber 24 is partitioned by the valve body 11 and the first diaphragm 13 and has the same size as the output pressure chamber 22. The output fluid pressure Po is received inside.
[0075]
The l-th gain switching chamber 25 is a chamber to which the input fluid pressure Pn or the atmospheric pressure is supplied from the first gain switching port 34, and forms a space partitioned by the fourth and fifth diaphragms 16 and 17. When the gain is high, the input fluid pressure Pn of the input pressure chamber 21 is supplied, and when the gain is low, the atmospheric pressure is supplied.
The first gain switching chamber 25 operates in cooperation with the second gain switching chamber 26. The first gain switching chamber 25 operates at high gain and low gain. When the supply pressure changes, the output changes at a constant rate. This is to make the supply pressure fluctuation compensation function. Here, the gain means that the output pressure change amount / input pressure change amount becomes a constant magnification.
The switching of the fluid supply to the first gain switching chamber may be controlled by a remote operation by a communication function using an electromagnetic valve (not shown) or the like.
[0076]
The second gain switching chamber 26 is a chamber to which the input fluid pressure Pn or the supply fluid pressure Ps is supplied from the second gain switching port 36, and a space partitioned by the second and third diaphragms 14 and 15. The input fluid pressure Pn of the input pressure chamber 21 is supplied when the gain is high, and the supply fluid pressure Ps of the supply pressure chamber 19 is supplied when the gain is low.
The switching of the fluid supply to the second gain switching chamber can be controlled by a remote operation by a communication function using an electromagnetic valve (not shown) as in the case of switching the fluid supply to the first gain switching chamber. You may do it.
[0077]
The valve plug 27 is a poppet valve that opens a flow path 43 that connects the supply pressure chamber 19 and the output pressure chamber 22, an exhaust valve section 41 that opens and closes the flow path 44 a, and a supply valve section 42 that opens and closes the flow path 43. And are formed.
[0078]
The valve plug 27 is disposed and accommodated between the supply pressure chamber 19 and the output pressure chamber 22 in a state of penetrating the flow path 43, and the input fluid pressure Pn increases, so that the moving body 12 is moved to the arrow A. When moving in the direction, the flow path 43 is opened so that the output fluid pressure Po increases.
[0079]
The spring 28 is a pressing member that presses the valve plug 27. The valve plug 27 is closed so that the exhaust valve portion 41 of the valve plug 27 closes the flow path 44 a and the supply valve portion 42 closes the flow path 43. Always press in the direction of arrow B. The spring 28 is compressed when the input fluid pressure Pn increases and the moving body 12 moves in the direction of arrow A while pressurizing the valve bragg 27.
[0080]
Next, the operation of the pressure amplifying apparatus having the above-described configuration will be described.
[0081]
(Equilibrium state)
As shown in FIG. 1, when air is supplied from the supply port 31 to the supply pressure chamber 19, the supply pressure chamber 19 and the bias chamber 20 receive the supply fluid pressure Ps.
Further, air flows into the input pressure chamber 21 from the input port 35, and the input pressure chamber 21 receives the input fluid pressure Pn.
[0082]
When air slightly flows into the output pressure chamber 22 from the supply pressure chamber 19 through the inflow hole 45, the output pressure chamber 22 and the feedback chamber 24 are connected to each other by a flow path (not shown). 24 receives the output fluid pressure Po.
[0083]
At this time, the spring 28 presses the valve plug 27 in the direction of arrow B, and the supply valve portion 42 closes the flow path 43, but there is a slight gap between the exhaust valve portion 41 and the flow path 44a. Is formed.
[0084]
As a result, the air flowing into the output pressure chamber 22 from the supply pressure chamber 19 through the flow path 45 flows into the exhaust pressure chamber 23 from the gap between the exhaust valve portion 41 and the flow path 44, and is mechanically stable. It is in an equilibrium state.
[0085]
(Output increase)
FIG. 2 is an operation explanatory view showing a state when the output fluid pressure is increased in the pressure amplifying apparatus according to the embodiment of the present invention.
When the air pressure flowing into the input pressure chamber 21 from the input port 35 increases, the input fluid pressure Pn received by the input pressure chamber 21 increases.
[0086]
Since the pressure receiving area of the fourth diaphragm 16 is larger than the pressure receiving area of the third diaphragm 15, the third and fourth diaphragms 15 and 16 stagnate due to the force corresponding to the difference between these pressure receiving areas, and the moving body 12 moves in the direction of arrow A.
[0087]
On the other hand, when the bias chamber 20 receives the supply fluid pressure Ps, since the pressure receiving area of the first diaphragm 13 is larger than the pressure receiving area of the second diaphragm 14, a force corresponding to the difference between these pressure receiving areas is indicated by the arrow B. It acts on the moving body 12 as a resistance force in the direction.
[0088]
The moving body 12 pressurizes the valve plug 27 while compressing the spring 28 against the pressing force of the spring 28, and the exhaust valve portion 41 closes the flow path 44 a, thereby moving the moving body 12 and the valve plug 27. Move together in the direction of arrow A.
[0089]
As a result, the valve plug 27 gradually opens the flow path 43, air flows into the output pressure chamber 22 from the supply pressure chamber 19 through the gap between the supply valve portion 42 and the flow path 43, and the output pressure chamber 22 The received output fluid pressure Po increases.
[0090]
When the air pressure flowing into the output pressure chamber 22 from the flow path 43 increases, the output fluid pressure Po received by the feedback chamber 24 also increases, and the increase in the output fluid pressure Po is fed back to the feedback chamber 24.
[0091]
Since the pressure receiving area of the sixth diaphragm 18 is larger than the pressure receiving area of the first diaphragm 13, a force corresponding to the difference between these pressure receiving areas acts on the moving body 12 as a resistance force in the direction of arrow B.
Thus, when the input fluid pressure Pn increases, the output fluid pressure Po increases at a constant magnification.
[0092]
(Output reduction)
FIG. 3 is an operation explanatory diagram showing a state when the output fluid pressure Po is decreased in the pressure amplifying apparatus according to the embodiment of the present invention.
[0093]
When the air pressure flowing into the input pressure chamber 21 from the input port 35 decreases and the input fluid pressure Pn received by the input pressure chamber 21 decreases, this corresponds to the difference between the pressure receiving areas of the third and fourth diaphragms 15 and 16. The force decreases and the force for moving the moving body 12 in the direction of arrow A decreases.
[0094]
On the other hand, the bias chamber 20 receives the supply fluid pressure Ps, and a force corresponding to the difference between the pressure receiving areas of the first and second diaphragms 13 and 14 acts in the arrow B direction. Moving.
For this reason, the valve plug 27 and the moving body 12 are separated from each other, and the exhaust valve portion 41 opens the flow path 44a.
[0095]
As a result, air flows into the exhaust pressure chamber 23 from the output pressure chamber 22 through the flow paths 44a and 44b, and the air in the exhaust pressure chamber 23 is discharged into the atmosphere from the exhaust port 33, and the output pressure chamber 22 and the feedback chamber are discharged. The output fluid pressure Po received by 24 decreases.
[0096]
Next, the occurrence of a gain difference due to the switching of the fluid to the first and second gain switching chambers 25 and 26 in the case of high gain and low gain will be described below. As described above, the gain is to make the output pressure change amount / input pressure change amount become a constant magnification. It operates at low gain and high gain, and when the supply pressure changes, the output becomes constant. The supply pressure fluctuation compensation which changes at a rate of 1 is made to function.
[0097]
When the pressures applied to the first and second gain switching chambers 25 and 26 are switched to change the combination of diaphragms that function by force balance, the first and second gain switching chambers 25 and 26 are supplied. The gain can be varied by the combination of fluids. In this case, supply pressure fluctuation compensation is made to function even if the gain changes.
Considering the diaphragm diameter, the following four types of places where the first and second gain switching chambers 25 and 26 are provided can be considered.
(1) As in the embodiment, the second gain switching chamber 26 is provided between the bias chamber 20 and the input pressure chamber 21, and the first gain switching chamber 25 is provided between the input pressure chamber 21 and the exhaust pressure chamber 23. Provide.
(2) A second gain switching chamber 26 is provided between the feedback chamber 24 and the bias chamber 20, and a first gain switching chamber 25 is provided between the input pressure chamber 23 and the exhaust pressure chamber 23. (3) A second gain switching chamber 26 is provided between the bias chamber 20 and the input pressure chamber 21, and a first gain switching chamber 25 is provided between the exhaust pressure chamber 23 and the output pressure chamber 22.
(4) A second gain switching chamber 26 is provided between the feedback chamber 24 and the bias chamber 20, and a first gain switching chamber 25 is provided between the exhaust pressure chamber 23 and the output pressure chamber 22.
[0098]
In the gain switching, when the gain is high, the input fluid pressure Pn is supplied to the first gain switching chamber 25 and the input fluid pressure Pn is supplied to the second gain switching chamber 26. As a result, the third and fourth diaphragms 15 and 16 do not function due to the balance of forces, and a high gain can be obtained, and at the same time, fluctuations in supply pressure can be compensated.
[0099]
When the gain is low, the atmospheric pressure is supplied to the first gain switching chamber 25 and the supply fluid pressure Ps is supplied to the second gain switching chamber 26. As a result, the second and fifth diaphragms 14 and 17 do not function due to the balance of force, and the gain becomes low. Similarly to the case of the high gain, fluctuations in the supply pressure can be compensated.
[0100]
【The invention's effect】
As described above, the pressure amplifying device according to the present invention can obtain the following effects.
[0101]
(L) Even in the structure provided with the first and second gain switching chambers capable of setting the gain, since the moving body is supported by the diaphragm, the moving body has no frictional contact portion, and the miniaturization is ensured. However, low hysteresis can be realized.
[0102]
(2) Two gain switching chambers, a first gain switching chamber and a second gain switching chamber, are provided, the pressures to the respective chambers are switched, and the combination of functioning diaphragms is changed by force balance, so that there are two types of high gain and low gain. Characteristics can be obtained, and supply pressure fluctuation compensation can be made to function even when the gain is low.
[0103]
(3) Even in the structure in which the first and second gain switching chambers are provided, the input pressure chamber in which the pressure changes and the output pressure chamber are not adjacent to each other. In a pressure amplifying apparatus having a structure in which a chamber and an output pressure chamber are adjacently separated by a diaphragm, when the input fluid pressure changes and the output fluid pressure changes, the input fluid pressure and the output fluid pressure change at a certain point. Since the size is reversed, the diaphragm protrudes toward the input pressure chamber or the output pressure chamber. Therefore, repeated stress is applied to the diaphragm and the durability of the diaphragm may be reduced. However, since the output pressure chamber and the output pressure chamber are separated from each other, the stress is not repeatedly applied to the diaphragm. As a result, the inspection work of the diaphragm is reduced, and the diaphragm can be used for a long time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a pressure amplifying device in a normal state according to the present invention.
FIG. 2 is a cross-sectional view of the pressure amplifying device when the output is increased according to the present invention.
FIG. 3 is a cross-sectional view of the pressure amplifying device when the output decreases according to the present invention.
FIG. 4 is a cross-sectional view of a pressure amplifying device in a normal state in the prior art.
FIG. 5 is a cross-sectional view of a pressure amplifying device when the output is increased in the prior art.
FIG. 6 is a cross-sectional view of a pressure amplifying device when output is reduced in the prior art.
[Explanation of symbols]
11 Valve body
12 Mobile
13 First diaphragm
14 Second diaphragm
15 Third diaphragm
16 Fourth diaphragm
17 Fifth diaphragm
18 Sixth diaphragm
19 Supply pressure chamber
21 Input pressure chamber
22 Output pressure chamber
23 Exhaust pressure chamber
24 Feedback room
25 First gain switching chamber
26 Second gain switching chamber
28 Spring
31 Supply port
32 output port
33 Exhaust port
34 First gain switching port
35 Input port
36 Second gain switching port
37 Bias port
38 Feedback mouth
42 Supply valve
43 Channel
44a flow path
45 Inflow hole.
ppt valve plug

Claims (1)

  Supply fluid and input fluid are supplied to a chamber that is partitioned into a plurality of parts by a diaphragm between the valve body and the moving body built in the valve body, and the pressure of the output fluid changes according to the change of the pressure of the input fluid. In the pressure amplification device
  A supply pressure chamber to which the supply fluid is supplied;
  An output pressure chamber adjacent to the supply pressure chamber and partitioned by the movable body and a sixth diaphragm;
  An exhaust pressure chamber adjacent to the output pressure chamber and partitioned by the moving body and a fifth diaphragm;
  A first gain switching chamber adjacent to the exhaust pressure chamber and partitioned by the moving body and a fourth diaphragm;
  An input pressure chamber adjacent to the first gain switching chamber and partitioned by the moving body and a third diaphragm;
  A second gain switching chamber adjacent to the input pressure chamber and partitioned by the moving body and a second diaphragm;
  A bias chamber adjacent to the second gain switching chamber and partitioned by the moving body and the first diaphragm;
  A feedback chamber adjacent to the bias chamber and partitioned by the moving body and the first diaphragm;
  It moves between the output pressure chamber and the supply pressure chamber following the moving body that moves in accordance with the input fluid supplied to the input pressure chamber, and changes the pressure output from the output pressure chamber. With valve plug
  Comprising
  The first and second gain switching chambers supply input fluid pressure to the first and second gain switching chambers when the gain is high, and supply atmospheric pressure to the first gain switching chamber when the gain is low. And supplying a supply fluid pressure to the second gain switching chamber
  A pressure amplifying device characterized by the above.

Images