JPH0438086Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an air relay that adjusts the secondary pressure taken out depending on the magnitude of the signal pressure, and particularly to an adjustment tool for adjusting the bias pressure thereof.

"Prior Art and its Problems" Referring to FIG. 2, the pneumatic relay to which the present invention is applied will first be explained. A primary pressure inlet 12 , a secondary pressure outlet 13 , and a signal pressure inlet 14 are opened in the housing 11 . A main valve 17 is provided in a passage 16 that connects the primary pressure inlet 12 and the secondary pressure outlet 13 . This main valve 17
Normally, the passage 16 is closed by the force of the compression spring 18.
is closed.

A pressure regulating mechanism 50 is provided in the housing 11 to open and close the main valve 17 depending on the magnitude of the signal pressure from the signal pressure inlet 14 to change the pressure taken out to the secondary pressure outlet 13. .

The pressure regulating mechanism 50 controls the flow rate between the control chamber 20 and the pilot pressure chamber 25 according to the control chamber 20, the measuring capsule 21 located in the control chamber 20, and the expansion/contraction or vertical position change of the measuring capsule 21. a pilot valve 24 that changes the road area;
It consists of a floating block 33 that moves up and down in response to pressure fluctuations in the pilot pressure chamber 25, a relief valve 38 that communicates the extraction chamber 30 with the outside depending on the up and down position of the floating block 33, and the like.

That is, the measuring capsule 21 is connected to the lower end of an adjusting screw 22 screwed into the housing 11, and has a signal pressure inlet therein through an inlet passage 23 bored in the shaft of the adjusting screw 22. A signal pressure from 14 is applied. The measuring capsule 21 is made of an elastic material that expands and contracts depending on the magnitude of this signal pressure.

At the lower end of this measuring capsule 21,
A pilot valve 24 is integrally provided, and this pilot valve 24 faces into a pilot chamber 25. The pilot valve 24 connects the communication path 2 between the control chamber 20 and the pilot chamber 25 depending on its vertical position.
It has a function of changing the amount of air flowing into the pilot chamber 25 from the control chamber 20 by changing the area of the flow path 6, and the communication path 26 is not completely blocked.

The pilot chamber 25 communicates with the outside air through a bleed hole 27. Secondary pressure on the side of the secondary pressure outlet 13 is introduced into the control chamber 20 via an outlet chamber 30 and a communication path 31 that communicate with the secondary pressure outlet 13 .

The lower wall of the pilot chamber 25 is defined by a pilot diaphragm 32 whose periphery meets the housing 1.
1, the central part is fixed to the upper surface of the floating block 33, respectively. A control diaphragm 34 facing into the extraction chamber 30 is fixed to the lower surface of the floating block 33, and the periphery of this control diaphragm 34 is similarly fixed to the housing 11.
A relief chamber 35 is formed between the control diaphragm 2 and the control diaphragm 34. Relief chamber 35
communicates with the outside air through a relief hole 36 bored in the housing 11.

A communication hole 37 is formed in the floating block 33 to communicate the extraction chamber 30 and the relief chamber 35, and this communication hole 37 is opened and closed by a relief valve 38 integrated with the main valve 17. 39 is a compression spring that pushes the floating block 33 downward.

The housing 11 includes a bias pressure adjustment mechanism 60 that adjusts the activation start pressure of the pressure adjustment mechanism 50 described above.
is provided. This bias pressure adjustment mechanism 6
0 by rotating the adjustment screw 22,
This is a mechanism for adjusting the vertical position of the measuring capsule 21. The housing 11 has an adjustment screw 22.
An adjustment port 15 that can be opened and closed by a plug 29 is provided at an extension of the adjustment port 15, and the adjustment screw 22 can be rotated by a driver (adjustment tool) inserted through the adjustment port 15. can. The tip of the introduction path 23 has a shape into which a driver can engage.

In the above air relay, regardless of the magnitude of the primary pressure on the primary pressure inlet 12 side, the pressure regulating mechanism 50 controls the secondary pressure outlet 1
The secondary pressure on the third side can be kept constant.

Depending on the magnitude of the signal pressure applied to the signal pressure inlet 14, the pressure regulating mechanism 50 can change the secondary pressure.

A feature is that the bias pressure adjustment mechanism 60 can adjust the magnitude of the signal pressure (bias pressure) that generates the secondary pressure on the secondary pressure outlet 13 side.

That is, in the above air relay, when a signal pressure of a value larger than the state shown in the figure is applied from the signal pressure inlet 14 in the state shown in the figure in which the main valve 17 closes the passage 16, the signal pressure is applied via the introduction path 23. It is introduced into the measuring capsule 21, and the measuring capsule 21 is inflated. Then, pilot valve 2
4 descends and the communication passage 26 opens wide, and as a result, the pressure in the extraction chamber 30 is led to the pilot chamber 25, and the pressure in the pilot chamber 25 increases, and this pressure increase causes the pilot diaphragm 32 and the floating block to 33 descends. The lowered floating block 33 pushes the relief valve 38 and closes the main valve 1.
7 to open the passage 16, the removal chamber 3
0, that is, the high pressure on the primary pressure inlet 12 side is introduced into the secondary pressure outlet 13 side.

When the pressure within the extraction chamber 30 reaches a certain value, the control diaphragm 34 receives the pressure and rises together with the floating block 33. Then, since the communication hole 37 separates from the relief valve 38, the extraction chamber 30 communicates with the outside air via the relief chamber 35 and the relief hole 36, and as a result, the extraction chamber 3
The pressure within 0 decreases. Since these two operations are performed continuously, the secondary pressure extracted to the secondary pressure outlet 13 is independent of the magnitude of the primary pressure.
The secondary pressure becomes a constant value corresponding to the signal pressure applied to the signal pressure inlet 14 (see FIG. 3), and when the signal changes, the secondary pressure changes accordingly (see FIG. 4).

The operation of inflating the measuring capsule 21 and moving the pilot valve 24 up and down is as follows:
The bias pressure adjustment mechanism 60 allows the adjustment screw 22
This can also be done by rotating the measuring capsule 21, that is, the pilot valve 24, and moving it up and down. Therefore, the main valve 17
It is possible to adjust the pressure (bias pressure) of the signal pressure inlet 14 that starts opening 6.

In the case of the precision air relay shown in the figure, as shown by the broken line in Figure 4, when the signal pressure is 0 kgf/cm2, the secondary pressure is approximately 2 kgf/cm2, which is +2 bias, and when the signal pressure is approximately 2 kgf/cm2, the secondary pressure is approximately 2 kgf/cm2. Next pressure is 0Kg
The bias pressure can be adjusted up to -2 bias of f/cm2.

By the way, in this air relay, in order to adjust the bias pressure, connect the plug 29 from the adjustment port 15.
After removing the adjustment screw 22 with a screwdriver and moving the measuring capsule 21 up and down,
After tightening the plug 29 again, it is necessary to actually flow pressurized air and try operating the machine. If the desired characteristics (bias pressure) are not obtained during operation, remove the plug 29 again, turn the adjustment screw 22 to move the measuring capsule 21 up and down, close the plug 29, restart the operation, and check the results. look. However, such trial-and-error adjustment is obviously inconvenient, and it is desirable to be able to adjust the bias pressure while driving.

"Purpose of the invention" Based on the discovery of the problems with the conventional products, the present invention aims to provide a bias pressure adjustment tool that can adjust the bias pressure while operating.

"Summary of the invention" The bias pressure regulator of the present invention is such that, in the above air relay, the regulator body is removably provided in the adjustment port provided on the extension of the adjustment screw having the measuring capsule. It is characterized in that the inner end forms a driver portion that engages with the adjusting screw of the measuring capsule, and the outer end portion rotatably supports an adjusting rotating body, which is a rotating operating portion, while maintaining an airtight state.

``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments. FIG. 1 shows a fitted pneumatic relay equipped with a bias pressure regulator 42 according to the present invention. This bias pressure adjustment tool 42 includes an adjustment tool main body 40 that is screwed into the adjustment port 15, and a shaft hole 4 of this adjustment tool main body 40.
1 and an adjustment rotating body 45 supported rotatably and movably a certain distance in the axial direction.

The adjustment rotating body 45 includes a driver part 45a that projects inward from the adjuster main body 40, a large diameter part 45b that is rotatably supported by the main body 40, and a small diameter part that passes through the main body 40 and faces the outside. 45c, and an operating portion 45d fixed to the outer end of the small diameter portion 45c via a fixing screw 46. An O-ring 43 that maintains airtightness is interposed between the small diameter portion 45c and the main body 40. The large diameter portion 45b and the small diameter portion 45c can move together in the axial direction.

The bias pressure adjustment tool 42 described above is used by screwing the adjustment tool main body 40 into the adjustment port 15 of the housing 11, as shown in FIG. That is,
When the adjusting rotating body 45 is moved in the axial direction by the operating part 45d and the driver part 45a thereof is engaged with the adjusting screw 22, the adjusting screw 22 can be freely rotated by the operating part 45d. At this time, air does not leak from the adjustment port 15. Therefore, the signal pressure is applied from the signal pressure inlet 14, and the primary pressure inlet 12 and the secondary pressure outlet 1
The bias pressure can be adjusted by moving the measuring capsule 21 up and down while detecting the pressure at step 3. Once the adjustment is complete, remove the main bias adjuster 4.
2 and then screw and fix a regular plug 29 into the adjustment port 15.

Note that FIG. 1 differs from FIG. 2 only in the points described above, and the same parts are given the same reference numerals.

"Effects of the Invention" As described above, according to the bias pressure regulator of the present invention, the bias pressure can be adjusted while applying the primary pressure, secondary pressure, and signal pressure to the air relay. In other words, the adjustment can be made while observing changes in the bias pressure using the pressure gauge, making the adjustment process simple and accurate. Then, after completing the adjustment, you only need to attach a plug to the adjustment port instead of this pressure regulator.
Unlike the conventional method, there is no need to attach and detach the plug each time the adjustment is made.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an air relay equipped with the air relay bias pressure regulator of the present invention, Figure 2 is a sectional view of a conventional air relay, and Figure 3 is a graph showing the relationship between primary pressure and secondary pressure. , FIG. 4 is a graph showing the relationship between signal pressure, secondary pressure and bias pressure. 11...Housing, 12...Primary pressure inlet, 13...Secondary pressure outlet, 14...Signal pressure inlet, 15...Adjustment port, 17...Main valve, 20...
...Control room, 21...Measure ring capsule, 22
...Adjustment screw, 24...Pilot valve, 25...
Pilot chamber, 29... Plug, 32... Pilot diaphragm, 34... Control diaphragm, 38... Relief valve, 40... Adjuster body, 41... Shaft hole, 42... Bias pressure adjuster, 43... O-ring, 45...Rotation adjustment body, 4
5a...Driver part, 45b...Large diameter part, 45c
...Small diameter portion, 45d...Operation section, 50...Pressure adjustment mechanism, 60...Bias pressure adjustment mechanism.

Claims (1)

[Claims for Utility Model Registration] A primary pressure inlet 12; a secondary pressure outlet 13; a signal pressure inlet 14; The primary pressure inlet 12 and the secondary pressure outlet 1 are opened in response to the expansion and contraction of the earring capsule 21 and the measuring capsule.
a main valve 17 that opens and closes the passage 16 between the three; an adjusting screw 22 having a measuring capsule 21 at one end and screwed into the housing 11;
In order to adjust the engagement position of the adjustment screw with respect to the housing to adjust the operating start pressure of the main valve 17, an adjustment port 15 opened in the housing 11 and a plug 29 for opening and closing this adjustment port are provided. A bias pressure adjustment mechanism 60 having the following features; An adjuster main body 40 that can be attached and detached to the adjustment port 15 of the housing 11 in place of the plug 29; An airtight state is maintained in the adjuster main body 40. The present invention is characterized by comprising: an adjusting rotary body 45 that is rotatably supported; and a driver portion 45a that is formed at the inner end of the adjusting rotary body and engages with the adjusting screw 22 of the bias pressure adjusting mechanism 60. Air relay bias pressure regulator.