JPS6040951B2 - Internal pressure control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal pressure control device for balancing the internal pressure of a watertight container or the like underwater in an underwater automatic welding apparatus with external pressure.

1 and 2 are explanatory diagrams showing a conventional internal pressure control device,
In the figure, 1 is a watertight container with a diaphragm 2 attached to its outer surface, a control cable 6 for a gas hose 5 for external connection, and a microswitch 8 in FIG. 1 and a lid switch in FIG. Built-in transformer 4.

A conventional internal pressure control device is constructed as described above. For example, it is placed inside and outside a watertight container 1, and as the water depth increases, the external pressure increases, creating a pressure difference, and the diaphragm 2 becomes watertight as shown in Figures 1 and 2. It becomes convex on the side of the container 1, and as a result, the micro switch 8 is activated in Figure 1, and the differential transformer 4 is activated in Figure 2, detecting that the external pressure has increased and supplying pressure gas from the gas hose 5. When the pressure becomes equal to the external pressure, both the micro switch 3 and the differential transformer 4 return to their original states.

However, as shown in Figures 1 and 2 above, both the microswitch 3 and the insert transformer 4 require cables to transmit signals to the outside, and the diaphragm 2 needs to be softer and more flexible in terms of functionality. - Since rubber material is generally used, there is a high risk of damage, and if such a thing were to occur, the equipment inside the watertight container 1 would become useless and would suffer serious damage.

Further, in the example shown in FIG. 1, it is impossible to detect when the pressure inside the watertight container 1 becomes higher than that outside, which causes problems in use. In the example shown in Fig. 2, although the problem shown in Fig. 1 is solved by the differential transformer 4, the differential transformer 4
The adoption of this method required a servo-type solenoid valve on the gas supply side, which had the disadvantage of requiring the use of very expensive equipment. The object of the present invention is to control the external connection cable with a single gas hose 5 in order to always equalize the pressure difference between the inside and outside of the watertight container 1.

3 to 5 are diagrams showing one embodiment of the present invention.

That is, in FIGS. 3 to 5, 7 is a cylindrical housing, which includes through holes 71 and 72, recesses 73 and 74, and an annular groove 7.
5, 76 and a flange 77. The flange 77 is then attached to the watertight container 1 by screws 8 into the packing 9.
It is screwed through 9. Reference numeral 9 denotes a main shaft slidably housed in the housing 7, which has a bottomed hole 91 that extends through the watertight container 1, annular grooves 92, 93, and 94, and annular grooves 92, 93. A penetrating hole 95 that communicates with the hole 91,
96, and male threaded portions g7, 98.

10, 11, 12, 13 are lock nuts screwed into the male threaded portions 97, 98, and 14, 15 are the recessed portions 73, 74.
The compression springs 16, 17, 18 inserted between the lock nuts 10, 11, 12, 13 are connected to the annular groove 75.
, 76 and 94, and 19 are supply nibbles that connect the through hole 71 and the gas hose 5.

20 is a check valve that connects the through hole 72 and the outside (water).

In the internal pressure control device configured as described above, when the pressures inside and outside the watertight container 1 are equal, the main shaft 9 is located at a position as shown in FIG.

However, when the external pressure becomes high as shown in FIG. Since the water is passed through the watertight container 1, high pressure gas g is supplied inside the watertight container 1.
The pressure inside the hole 91 gradually increases, and when it becomes equal to the external pressure, the supply of gas is stopped, and the main shaft 9 returns to the position shown in FIG. 4 again. On the other hand, when the internal pressure of the watertight container 1 and the hole 91 becomes high as shown in FIG. and the outside of the housing 7 (water), the high pressure gas inside the watertight container 1 and the hole is discharged to the outside from the check valve 11, and as a result, the internal pressure gradually decreases and the external pressure increases. When the two are equal, the discharge stops, and the main shaft 9 returns to the position shown in FIG. 4 again. In addition, the compression springs 14 and 15 play an important role in setting the main shaft operating pressure and the relative position between the housing 7 and the main shaft 9, and their adjustment is performed by the main shaft 9.
Lock nuts 10, 11, 12, 13 attached to
I'll do it at Although the gas g may be continuously supplied, a detection device for detecting the position of the main shaft 9 is provided, thereby controlling the gas supply. A typical application example of this embodiment is the seventh example.
As shown in the figure, when an underwater automatic welding device 21 is remotely controlled on a ship 22, and when attempting to control each operation using various drive sources, as the water depth increases, the external pressure of the watertight container 1 increases and the drive source A force other than the load acts on the motor, resulting in insufficient driving force.

Therefore, a device is required to control the pressure inside and outside of the watertight container that houses the drive source so that the pressure is always the same at any position in the water depth. In FIG. 7, 23 is the object to be welded, 24 is the guide rail of the underwater automatic welding device 21, and 2
6 is a welding torch, and 26 is a part to be welded. As explained above, this invention has the advantage that the pressure inside and outside of the watertight container 1 can always be made the same pressure with a single gas hose 5 without the risk of damage due to its simple structure. Further, according to the present invention, since the second through hole is provided with a check valve, water does not flow into the device when the device is used underwater, and furthermore, the first and second through holes in the housing prevent water from flowing into the device when the device is used underwater. O-rings are provided on the inner peripheral surface of both sides of the hole, and an O-ring is provided on the outer peripheral surface between the third and fourth through holes of the main shaft, so the length of the housing and the main shaft can be kept to the minimum necessary. At the same time, airtightness between the housing and the main shaft can be maintained at all times.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the conventional internal pressure control system, FIG. 3 is an explanatory diagram showing an example of use of the present invention, FIG. 4 is a sectional view showing an embodiment of the present invention, and FIG. Figure 6 is an explanatory diagram of the operation when the external pressure becomes high in the one shown in Figure 4.
The figure is an explanatory diagram of an example of application of the present invention. In the figure, 1 is a water honey container, 5 is a gas hose, 7 is a housing, 71 and 72 are first and second through holes, 9 is a main shaft,
95, 96 are third and fourth through holes, 14, 15 are springs, 10, 11, 12, 13 are lock nuts, 17, 75
, 76 is a ring, two-way check valve. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. A cylindrical housing 7 having a first through hole 71 through which gas is supplied and a second through hole 72 communicating with the outside in a wall portion, which is slidably fitted into the housing. third and fourth through holes 95 and 96 having a bottomed hole 91 at one end thereof, and having the other end exposed outside the housing 7 and communicating with the hole 91;
in the wall, and the third through hole 95 and the fourth through hole 9
6 is made shorter than the distance between the first through hole 71 and the second through hole 72, so that when the first and third through holes 71 and 95 are in opposing positions, the second through hole and the main shaft 9 where the fourth through holes 72, 96 do not face each other, and the first and second through holes 71, 72 and the third and fourth through holes 95, 96 are in a neutral position where they do not face each other. It includes springs 14 and 15 that hold the main shaft 9, and a check valve 20 that prevents fluid from flowing in from the outside is disposed in the second through hole 72. 2
O-rings 75, 7 are installed on the inner peripheral surfaces of both sides of the through holes 71, 72.
6 are respectively disposed, and the third and fourth
An internal pressure control device characterized in that an O-ring 17 is disposed on the outer peripheral surface between the through holes 95 and 96. 2 The main shaft 9 has lock nuts 10, 11, 12 on both ends.
, 13, and compression springs 14, 15 are mounted between the lock nuts 10, 11 at one end and the housing 7, and between the lock nuts 12, 13 at the other end and the housing 7. An internal pressure control device according to claim 1.