JPS6019376B2 - Air pressure control device inside the canister - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that automatically adjusts the air pressure inside a subcase during subcase construction.

The bath box construction method has traditionally been widely used when installing columnar structures such as bridge piers below the groundwater table or at the bottom of the water. This method involves digging into the ground, allowing the box to gradually sink under its own weight, and then installing it at the desired location.However, in order to excavate earth and sand below the groundwater table 2, a bulkhead 3 is installed below the box, and a bulkhead 3 is installed below the box. A working room 4 is provided, and compressed air is introduced into this room to raise the atmospheric pressure to prevent underground water from entering, and workers excavate in this working room.

In this case, it is desirable that the atmospheric pressure in the working chamber is lower than the pressure corresponding to the water depth rule from the groundwater table 2 to the cutting edge 5, which is the lower edge of the molten box, by a certain amount. If the pressure in the work room is significantly lower than the pressure corresponding to the day when the water is deep, groundwater will enter the work room and pose a danger to workers. When the temperature is high, indoor air flows into the ground. This lost air not only causes power loss in the air compressor, but also causes serious pollution by inducing dripping in wells near the workplace and causing underground air flow, causing oxygen-deficient air to flow into nearby basements. There is a fear that this may lead to As mentioned above, the working room air pressure P2 is P
-p (where P is the pressure equivalent to water depth ko/earth, p is 0.
02k9/approximately constant pressure), the water level 6 in the work chamber becomes the most desirable state, forming a water seal water level h corresponding to p at the cutting edge as shown in the figure. However, this water depth changes due to the effects of rainfall and tides, and also changes due to the subsidence of the submersible due to its own weight as the construction progresses, so conventionally it took a lot of effort to keep the air P2 in the work room at P-p at all times. The work is carried out by artificially adjusting the amount of compressed air while carefully monitoring the barometer in the work room and the surface of the leaking water.

Attempts have been made to systematically control this pressure adjustment using water level gauges, limit switches, relays, and solenoid valves, but although these electromagnetic control devices have the advantage of quick response, they do not work well. It had shortcomings in reliability, stability, and durability.

The underground water level does not fluctuate rapidly, and sudden changes in atmospheric pressure are not good for the hygiene of workers in the workplace, so adjusting the pressure in the workplace does not require a microsecond-level response. It is absolutely required that the system operate reliably and stably in response to the gradually changing depth of groundwater. The present invention has been made in view of the above circumstances, and aims to provide a fluid device-type adjusting device that guarantees reliable and stable operation so as to automatically keep the water seal water level h at the blade mouth constant. It is. As a specific means, a pneumatic on-off valve is interposed in the air supply pipe that sends compressed air into the work chamber, and a control relay having a water level transmitter at one end is attached to the pneumatic on-off valve via a diaphragm. The water level transmitter has a nozzle that blows out compressed air, and means that opens and closes the core nozzle floor opening using changes in the water seal water level to generate a signal pressure proportional to the water level change, and the control relay is configured to control the signal The inside of the submersible is characterized in that it is equipped with a means for generating an output air pressure proportional to the signal pressure using the differential pressure between the pressure and the working chamber pressure, and that the output air pressure is applied to the diaphragm to open and close the air pressure on-off valve in conjunction with the output air pressure. It was configured as an air pressure control device. Further, in the device, the control relay connects bellows through which the signal pressure and the work chamber pressure are individually passed through, facing each other across the beam, and brings the nozzle opening close to the nuclear beam. The nozzle is passed through the input pipe line of the pilot relay, and the output air pressure proportional to the signal pressure is passed from the pilot relay to the diaphragm.

Next, first of all, the principle and equipment structure of the device of the present invention will be explained based on FIG. 4, and the air pipe 1
The pressure gauge P2, which is set to 0, indicates the working chamber atmospheric pressure with a practically sufficient approximation.

A transmitter 121 equipped with a float 11 that is suspended on the water surface 6 in the work room is fixed to the submersible box, and the transmitter uses the discharge pressure P of the air compressor as the operating pressure source. is appropriately reduced to a pressure Pa by a pressure reducing valve 13 and is supplied via a pipe line 14. The transmitter further reduces the pressure of the supplied pressure air to a signal pressure Pt that rises and falls in proportion to fluctuations in the water level h, and transmits this to the control relay 16 via the pipe 15. The control relay 16 uses the pressure air at the discharge pressure P of the air compressor 7 as an operating pressure source to the pressure reducing valve 1.
The signal pressure Pt' is reduced to an appropriate pressure Pa' and supplied to the diaphragm 8, which is then reduced to an output pressure Pb which increases or decreases in inverse proportion to the signal pressure Pt'. In this way, the diaphragm 8 is given a fluctuating pressure Pb which is an amplification of the signal pressure Pt that changes according to the water level h, and accordingly opens and closes the pneumatic on-off valve 9. If the water level h increases slightly, the valve 9 is opened and closed. When the water seal opens and the water level h decreases, it functions to throttle the valve 9, and adjusts the amount of compressed air to keep the water seal water level h at a stable constant value, thereby reducing the air pressure P2 in the work chamber 4.
automatically adjusts.

The functions of each of these devices will be explained based on FIG. 2, which shows a simplified and equivalent internal structure of the transmitter 12 and the control relay 16.
The float 11 is suspended from the tip of the float 11, and is powered upwardly by a spring 12c.

The nozzle 12d faces the upper surface of the forehead movement 12a and is supplied with pressurized air Pa through the orifice 12e.
When the float 11 floats and the neck 12a rises, its upper surface comes into contact with the mouth of the nozzle 12d to prevent air from flowing out, so the air pressure inside the nozzle is close to pressure Pa regardless of the presence of an orifice. rises to. The transmitter 12 also connects components such as the nozzle counterfeit port 12d-, the Bourdon tube 12d-3, the three-way valve 12i, and the pilot relay 12g to the container 12.
The inside of the tank is connected to the ground atmospheric pressure by a conveying pipe 17, and the float 11 sinks and spreads to the top of the sardine pestle 12a.
When it is lowered, its upper surface is separated from the mouth of the nozzle 12d, so the air inside the nozzle flows out, but the air pressure inside the nozzle is The atmospheric pressure drops to near the surface atmospheric pressure. In this way, the internal pressure of the float rises and falls as the float 11 rises and falls, and this pressure is transmitted to the pilot relay 12g via the pilot pipe 12f. The pilot relay amplifies and stabilizes the pressure fluctuation within the pilot pipe by a configuration function to be described in detail later, and transmits the signal pressure Pt to the control relay 16 via the pipe 15. The right end of the beam 16a of the control relay 16 is elastically supported by air springs 16b and 16c, and two operating bellows 16d and 16e are provided facing each other via the left end thereof.

A nozzle 16f provided opposite to the upper surface of the beam 16a is supplied with pressurized air Pa' through an orifice 16g, and transmits the back pressure to a pilot relay 16i through a pilot conduit 16h. Upper bellows 1
6d is passed through the signal pressure Pt transmitted from the transmitter 12, and the lower bellows 16e is passed through the working chamber pressure P2, so the left end of the beam 16a is connected to the signal pressure Pt and the working chamber pressure P2. It is moved up and down according to the pressure difference.

Then, when the water level h rises and the signal pressure Pt rises, the bellows 16d strongly presses down the beam 16a and the bellows 16f
The pressure inside the pilot pipe 16h is reduced. The pilot relay 16i receiving this pilot pressure is the pilot relay 16i used in the transmitter 12.
It has a similar structural function to that of g, and when the pilot pressure decreases, its output pressure Pb decreases in proportion to this. Then, the diaphragm 8, which is passed through the diaphragm 8, operates to open the pneumatic on-off valve 9, allowing the discharge air of the air compressor 7 to be sent into the working chamber, thereby increasing the working chamber pressure F2. It acts to reduce and restore the water seal water level h. Next, the configuration of the transmitter 12 shown in the Minato style in FIG. 2 will be explained in detail based on FIG. 3 which shows an embodiment of the transmitter 12. is suspended, and its base end is fixed to the pith 12b, and this ball 12b is attached to a marriage spring (
(not shown) in a direction to lift the float 11. A moving piece 12a-12, which moves with the moving movement of the moving pestle, is fixed to this shaft 12b, and faces the hole 12d- of the nozzle 12d. The ventilation pipe 12d-2 of this nozzle 12d is inserted into the Bourdon tube 12d-3 in the form of a double pipe, and its tip becomes the air hole 12d-, and its base end connects to the pilot relay 12 through the pilot pipe 12f.
The signal pressure chamber 12d is connected to the signal pressure chamber 12d. Bourdon tube 12d- supporting this nozzle ventilation pipe 12d-2
3 connects its base end to the movable village 12h- of the water level setting device 12h.
, and when you turn dial 12h-2, cam 1
2h-3 rotates to mirrorly move the movable punch 12h-, and the Bourdon tube 1 that supports the nozzle opening 12d-.
2d-3 spreads around the moth 12b to warm the nozzle □12d
-, can be freely adjusted toward and away from the forehead moving pieces 12a-2.

In addition, the Bourdon tube 12d-3 makes a bending motion or an extensional motion in response to changes in the pipe internal pressure, and the nozzle opening 12d-3 moves the forehead motion piece 1.
2a-2, and receives feedback from the signal pressure Pt, which is the output of the pilot relay 12g, through the three-way valve 12i, which is applied to the negative tip as described later. It is configured to provide a feedback effect. And the three-way valve 12i is suitable for the boat 1 which is connected to the Bourdon tube 12d-3.
2i-, the boat 12i- which is suitable for the signal output conduit 15
2. A boat 1 that is operated by a boat or opened to the atmosphere.
The structure is such that the feedback rate can be freely adjusted by allowing it to pass through 2i-3 or by narrowing it down to an intermediate state. The pilot relay 12g has 2 internal parts.
A signal pressure input chamber 12g-, a signal pressure output chamber 12 partitioned by two diaphragms 12g-2 and 12g-3.
It is divided into an atmospheric pressure chamber 12g-4 and an atmospheric pressure chamber 12g-5, and the area of the diaphragm 12g-2 is three times that of the diaphragm 12g-3. And the floating box 12g-6 is elastically supported by two diaphragms, and the floating box 12g is supported elastically by two diaphragms.
It is energized upward by -7. Also, spool valve 1
2g-8 receives the biasing force of the spring 12g-9 and normally closes the space between the air pressure source (not shown) having the pressure Pa passed through the pipe line 14 and the signal pressure output chamber 12g-4, and Atmospheric pressure chamber 12g-5 and signal pressure output chamber 12g-1. However, when the floating box 12g-6 ascends, the signal pressure output chamber 12g-4 and the atmospheric pressure chamber 12g-5 are communicated,
Also, when the floating box 12g-8 descends and pushes down the spool valve, the pipe line 14, which is suitable for the pressure source, opens the signal pressure output chamber 12g.
It is structured so that it can be passed through from 1 to 4. The signal pressure transmitter 12 according to the present invention has the above-mentioned configuration, and when the spring water level 6 rises relative to the submarine box in which the transmitter is installed, the buoyancy exerted on the float 11 increases, causing troublesome work. Pestle 12a
1. The actuating piece 12a-2 is raised and attached to it.
The nozzle collides with the hole 12d-, suppressing the blowout of air.

Since the signal pressure input chamber 12g-1 is fed to the conduit 14 via the orifice 12g-, o, when the tip of the nozzle 12d- is blocked, the pressure in the same chamber tends to approach the supply pressure Pa. Rise. Then, due to the increase in pressure applied to the diaphragm 12g-2, the floating box 1 attached to it
2g-6 is moved downward and collides with the spool valve 12g-8 and pushes it down, so the signal pressure output chamber 12g-4
Compressed air flows into the pipe 12g-4 from the pipe 14, increasing the pressure within the same chamber. However, this increased pressure is transmitted to the Bourdon tube 12d-3 via the three-way valve 12i, so the Bourdon tube 12d-8 deforms in the direction of extension, separating the nozzle opening 12d-1 from the pocket piece 12a-2. It works like this. When the rise in the artificial water surface 6 is large, even if the Purudon tube 12d-3 is extended with the increase in the signal pressure Pt and the nozzle opening 12d- is spaced apart, the float height of the float 11 is proportional to the As the moving piece 12a-2 rises and tries to block the nozzle light port 12d-, the pressure in the signal pressure input chamber 12g- increases, and therefore the pressure in the signal pressure output chamber 12g-4 increases. It was continued and ended up being 12
Equilibrium is reached when the signal output pressure Pt rises to the extent that the Bourdon tube 12d-3 is extended to move the nozzle jaw 12d- away from the nozzle jaw 12d- by an amount commensurate with the upward movement of the nozzle a-2.

In this way, the transmitter 12 generates a signal pressure Pt proportional to the rise and fall of the water surface 6, and transmits this to the next stage of equipment via the pipe 15, as described earlier. The three-way valve 12i has a Bourdon tube 12d-3 and an output chamber 12g-4.
The balance sensitivity of the Bourdon tube device can be adjusted by freely restricting the balance between the Bourdon tube 12d-3 and the atmosphere, and as a result, the water level change △h' The ratio of the signal pressure change ΔPt to the signal pressure change ΔPt can be freely adjusted. In addition, if you change the rotation angle of the cam 12h-8 by rotating the dial 12h-2, the movable position 12 can be adjusted.
h-, is moved in response to this, and the Bourdon tube 12d-3 attached to it is rotated in the same D shape to balance the frame 12a-, i.e. The standard water level h that the fully equipped hawk should adjust itself can be adjusted freely. Next, the specific configuration of the control relay 16 that operates in response to signal pressure from the present transmitter will be explained based on FIG. 4 showing one embodiment.

This FIG. 4 shows in detail the control relay 16 part shown in FIG. Two operating bellows 16d and 166 are engaged oppositely through the left end,
The operating bellows 16d is supplied with the signal pressure Pt which is the output of the transmitter 12, and the operating bellows 16e is supplied with the internal pressure P2 of the canister working chamber. The nozzle 16f facing the upper surface of the beam 16a is fixed near the center of the moving punch 16f-, the left end of which is elastically supported by a spring 16f-2, and the right end supported by a cam 16f. The nozzle 16f is slidably supported on the handle 16f-3 and is moved by the operation of the handle 16f-4, so that the position of the nozzle 16f can be freely adjusted up and down. The pilot relay 16i has a similar structure and function to the previously described pilot relay 12g used in the transmitter 12, and receives pressure Pa from the pipe 16i-.
The output pressure Pb proportional to the nozzle back pressure transmitted to the signal pressure chamber 16i-2 transmitted to the nozzle 16f is transmitted to the pipe 16i-3 and transmitted thereto. The diaphragm 8 and the pneumatic on-off valve 9 connected to the diaphragm 8 are operated. Then, the output pressure Pb is proportionally reduced by the three-way valve 16i, and further divided by the distribution valve 16-1 to the air spring bellows 1.
6b and 16c. As mentioned above, when the water seal water level h rises, the signal pressure Pt increases relative to the air box work chamber pressure P2 due to the action of the transmitter 12, so the pressure Pt in the opposing bellows 16d is activated. The pressure inside the rose 16e becomes relatively high compared to the working chamber pressure P2, and operates to push down the beam 16a and separate it from the nozzle 16f.

For this reason, the nozzle back pressure decreases, and the pressure in the signal pressure input chamber 16i-2 of the pilot relay i6i which is escaped thereby decreases, so that the output pressure Pb decreases in proportion to this. Then, the pressure applied to the upper part of the diaphragm 8, which is passed through this, decreases, so the pneumatic on-off valve 9 is closed by the action of the built-in spring 9a, and the air discharged from the air compressor 7 is sent into the work chamber 4. As a result, the air pressure P2 in the same room is increased, so that the water seal water level h decreases and returns to the original water level. In addition, contrary to the above, when the working chamber pressure P2 becomes relatively higher than the appropriate pressure compared to the underground water pressure corresponding to the water depth H', and the water seal water level h decreases, the transmitter 12
The signal pressure Pt of the pilot relay 16i decreases, and the pressure inside the actuating bellows 16d decreases, so the beam 16a rises and approaches the nozzle 16, increasing the back pressure, so the output pressure Pb of the pilot relay 16i increases and the diaphragm The pressure applied to the upper part of 8 increases, and the pneumatic on-off valve 9 is closed against the force of the built-in spring 9a, cutting off the supply of high-pressure air and reducing the work chamber pressure P.
2, the water seal water level h rises and returns to the original water level. At this time, by operating the handle 16f-4 and adjusting the position of the nozzle 16f in the vertical direction via the cam 16f-3, the working chamber pressure P2 that should be balanced in the most desirable state of the device is
can be set freely. As is clearly understood from Figure 1, the working chamber pressure P2 is the pressure that should be balanced as a reed pressure between the pressure corresponding to the water depth day and the pressure corresponding to the water seal water level h. When the water seal level h changes involuntarily, it must be automatically controlled to keep the water seal water level h constant by the action described above. It is necessary to increase the setting of the working chamber pressure P2 to match the increasing water depth, so in such a case, the pressure can be adjusted to suit the increasing water depth by operating the handle 16f-4. It is something that

Also, an air pane bellows 16b supporting the beam 16a,
The output pressure Pb is fed back to the control relay 16c through a three-way valve 16j and a distribution valve 16k, and by adjusting these, the response state of the control relay device can be adjusted to stabilize the operation. The transmitter 12 and the control relay 16, which are the main devices constituting the present invention, each have the above-mentioned structural functions, and an embodiment of the present invention configured as shown in FIG. The specific operating method and operation implementation will be described below.

Assume now a state in which the water seal water level h maintains equilibrium as follows.

That is, it is assumed that the blade □5 of the submersible case 1 is dug down to approximately LOW below the groundwater level, the working chamber pressure is maintained at P2=lk9/earth, and the water seal water level is balanced at h=20 to the seaboard. The output signal pressure Pt of the transmitter 12 is 0.6k9, and the adjustment state of the three-way valve 12i (Fig. 3) is the output signal pressure change △Pt= for a water level change △h=1 pig. 0
．． It is assumed that the ratio is set to 2k9/ground. In this state, the signal pressure Pt=0.6k9/ground is applied to the operating bellows 16d shown in FIG.
The working chamber pressure P2;lk9/enemy is introduced into the beam 16a, and the differential pressure between the two P2-Pt=1-0.6=
It takes a position balanced to 0.4 x 9/, restricts the outflow air of the nozzle 16f and generates back pressure, and this back pressure operates the pilot relay 16i and changes the function of the pneumatic on-off valve 9 via the diaphragm 8. by controlling the working chamber pressure P2=l
It is kept at K9/S.

In this way, when the water depth and water level h are constant, the working room pressure P
2 is kept constant, the opening degree of the pneumatic on-off valve 9 is such that the amount of air corresponding to the sum of the amount of consumed air and the amount of leaked air in the work chamber 4 and the range suitable for this is controlled from the compressor 7. It is designed to produce a constriction effect sufficient to force the material into the working chamber 4.

From the above-mentioned equilibrium state, the groundwater table 2 increases due to rainfall, etc.
Assuming that the water level has risen by lm, the groundwater will flow into the working room 4 even on the water depth day, and the water seal water level h will show an increasing tendency. However, if the water level h has now risen by 5 lm, the transmitter 12 will As mentioned above, △h=1, whereas △Pt=0
．． Since the ratio is set so that the water level rises by 2k9/〆, the signal pressure increases by 0.1k9/day and becomes 0.7k9/fu when the water level rises 5 times.

The control relay 16 is connected to the operating bellows 16 as previously described.
The differential pressure between d and 16e was balanced at 0.4k9/m, but
Due to the increase in signal pressure, this pressure difference becomes P2-Pt=lk9
/ uniformity 0.7k9/ enemy = 0.3 [9/ ground, the equilibrium is broken, the beam 16a is forced to move downward, and the nozzle 16f
Since the nozzle back pressure decreases, the output pressure Pb of the pilot relay 16i decreases in proportion to this, and the function of the pneumatic on-off valve 9 is increased via the diaphragm 8 to increase the amount of air supplied. Air pressure in the work room? 2 increases gradually. This state continues until the pressure difference given to the operating bellows 16d and 16c returns to equilibrium by 0.4 [9/enemy], and in this example, the water depth increases by 1 and corresponds to this. Since the groundwater pressure has increased by 0.1 kQ/〆, the work room pressure P2 increases by 0.1 kQ/〆 compared to the previous state and continues until it reaches 1.1㎡/〆.

・When the inside of work room 4 reaches 1.1 k9/ground, the pressure has increased by an amount equivalent to the rise in groundwater pressure, so the water seal water level, which corresponds to the differential pressure between the ground water pressure and the work room atmospheric pressure, is 20 k9/ground from the previous equilibrium state. Water level change from Yamaguchi△
The signal pressure of the transmitter 12 rises by h = 5 ribs and the signal pressure of the transmitter 12 is Pt = 0.
7k9/ground and here the water seal water level h=20
5 ribs = A new equilibrium state will occur while maintaining constant conditions.

Note that when viewed from the equilibrium state at the beginning of the technique, the water surface 6 changes slightly, but the water seal is practically constant (h
': h). If for some reason the groundwater level 2
decreases, the water depth decreases, and the water seal water level h attempts to decrease accordingly, contrary to the operation described above, the signal pressure Pt decreases and the equilibrium plexus pressure of the operating bellows 16d and 16e decreases. collapse, the beam 16a rises, the back pressure of the nozzle 16f increases, the pilot relay 16i output Pb rises, and the function of the pneumatic on-off valve 9 decreases due to the diaphragm 8.
Through the operation of the series, the atmospheric pressure in the work chamber is lowered in proportion to the decreasing water depth while maintaining the new condition of water seal water level h''=-constant.

In this case as well, the water seal water level is practically constant (h''d).Next, as the excavation progresses,
To explain the operation and operation when sinking the case, even if you dig out the part directly below the knife opening 5 in the submerged diagram 1, the submerged case 1
may not sink immediately, but in this case, subcase 1
The weight of the workpiece is supported mainly by the atmospheric pressure within the work room, the buoyant force of groundwater, and the frictional force of the surrounding earth and sand.
Therefore, in order to force the submersible to sink, the workers must be evacuated, the pressure in the work chamber will be lowered manually, and groundwater will flow in to reduce the buoyant force on the submersible 1 and help it sink under its own weight. However, in order to perform this operation in the present invention, the handle 16 shown in FIG.
Operate f-4 to move the nozzle 16f downward. Then, due to the increase in nozzle back pressure, the pilot relay 16
The output pressure Pb of i increases, the diaphragm 8 is operated, the pneumatic on-off valve 9 is closed, and the pressure inside the melt box is reduced. This work can be carried out safely and reliably because the ground worker can make adjustments while directly observing the sinking state of the submersible case 1. In this case, the working chamber pressure A is approximately set by the position of the handle 16f-4, so if the scale indicating the double angle of the handle 16f-4 is attached to correspond to the water depth, it is possible to When draining water, adjust the handle 16 so that the new water depth H' is obtained by adding the pre-sedimentation water depth and the pre-sedimentation water depth.
By operating f-4, the atmospheric pressure in the working chamber will rise to a pressure corresponding to the water depth H', and most of the groundwater that has entered the working chamber will flow out, and the water level of the minato water level 6 will be raised to the water seal level h.
equilibrium, allowing work to resume and continue.

In the above explanation, if the transmitter 12 does not have the container 12i containing the pilot relay 12g, the three-way valve 12i, etc. which are its components, and the lotus tube 17, that is, the components of the transmitter 12 are If it is not isolated, the transmitter 12 will operate based on the work chamber pressure P2, but in this case, the pressure reducing valve 13 will be connected to the work chamber 4.
The same operation can be performed by adjusting and setting the supply pressure Pa as appropriate.

When the present invention is applied, the effects described in detail above will always keep the water seal water level h constant in bath box construction, ensure the safety and health of workers, and prevent well flooding and oxygen deficiency accidents. Moreover, it is possible to completely prevent redundancy of pressurized air, and to forcibly sink the submersible depending on the progress of the work, it is possible to flood the work room and drain water to continue restarting the work. Operations can be performed quickly, easily, safely, and reliably.

Furthermore, since the device of the present invention is not controlled by an electrical system, there is no electrical equipment or wiring at least below the groundwater table.
Military accidents and emotional disasters will never occur.

Regarding each component of the present invention, the transmitter 12 sensitively and accurately senses water level fluctuations, converts it into a signal pressure Pt, and transmits it, but the pilot relay 12g is used to amplify the signal pressure. Since the system is stable, it is not easily affected by vibration or deformation of the signal transmission pipe, and water level setting and sensitivity adjustment can be easily and reliably performed using the dial 12h-2 and the three-way valve 12i.

Furthermore, the control relay 16 can receive the input signal pressure Pt and amplify it to the point where it can operate the air on-off valve 9 while balancing it with a constant pressure difference with respect to the working chamber pressure P2. It can be easily and accurately adjusted to correspond to the working water depth, and the operating range and operating sensitivity can be freely adjusted using the three-way valve 16i and the distribution valve 16k, so there is no additional stress or mental burden on the worker. Moreover, it is possible to ideally and completely adjust the air pressure inside the submersible without requiring any physical effort, and it is a useful invention with high practical value.

Brief Explanation of the Drawings Figure 1 is a diagram showing the overall configuration of an embodiment of the present invention;
3 is a partial sectional view showing the structure of the transmitter section, and FIG. 4 is a partial sectional view showing the structure of the control relay section.

1...Surface box, 4...Same work room, 8...
...Diaphragm, 9...Pneumatic on-off valve,
10... Air pipe machine, 11... Float, 12.
...Water level transmitter, 12a-, ...Kagamikin village, 12a-2...Korokinka, 12d-. ...Fake nozzle, 12d-8...Bourdon tube, 12g...Pilot relay, 12i...Three-way valve, 16a.
...beam, 16d...operating bellows,
16e... Operating bellows, 16f...
/ Zuru spout.

Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A pneumatic on-off valve is interposed in the air supply pipe that sends compressed air into the subbox work chamber, and a control relay having a water level transmitter at one end is attached to the pneumatic on-off valve via a diaphragm, The water level transmitter has a nozzle that spouts compressed air, and means for opening and closing the nozzle nozzle using changes in the water seal water level to generate a signal pressure proportional to the water level change, and the control relay is configured to generate a signal pressure proportional to the water level change. The air in the subcase is equipped with a means for generating an output air pressure proportional to the signal pressure based on the differential pressure between the pressure and the working chamber pressure, and the output air pressure is communicated with the diaphragm to open and close a pneumatic opening/closing valve in conjunction with the air pressure. Pressure control device. 2. A pneumatic on-off valve is interposed in the air supply pipe that sends compressed air into the subcase work chamber, and a control relay having a water level transmitter at one end is attached to the pneumatic on-off valve via a diaphragm, and the water level transmitter is connected to the compressor. It has a nozzle that blows out air, and a means for opening and closing the nozzle nozzle using changes in the water seal water level to generate a signal pressure proportional to the water level change, and the control relay is configured to control the signal pressure and the working chamber pressure. The bellows, each of which is individually communicated with each other, are connected to face each other across a beam, and a nozzle with a nozzle orifice close to the beam is communicated with the input pipe of a pilot relay, so that a signal pressure proportional to the signal pressure is output from the pilot relay. An air pressure control device in a subcase, characterized in that the output air pressure is communicated with the diaphragm.