JPS6123729Y2 - - Google Patents

Description

[Detailed explanation of the invention] Demand for emergency shutoff valves that quickly shut off the upstream pipe when water pipes are damaged and water flows out due to earthquakes or civil engineering work is increasing. There is.
However, since conventional emergency shutoff valves have an emergency shutoff device and a butterfly valve valve box that are integrated, it is necessary to remove the conventional valve when installing it as a valve with an emergency shutoff device. The emergency shutoff device has a structure that corresponds to a valve with a horizontal valve stem, which requires a large installation area, and cannot be stored in the existing butterfly valve storage pit, so the pit must be enlarged. Furthermore, conventional valves with emergency shutoff devices have a solenoid or electromagnetic brake attached near the valve, so they cannot be used in locations where the valve body may be submerged in water.

In order to solve the above-mentioned drawbacks of the conventional emergency shutoff valve, this invention provides an emergency shutoff device that can be easily connected to an ordinary butterfly valve or ball valve to perform an emergency shutoff action. .

In other words, the configuration of this invention is that in a valve that opens and closes the valve body by rotating the valve stem, a machine box is provided on a stand provided above the valve box, and a horizontal input rotation shaft is attached to this machine box. A vertical output rotation shaft is provided which is interlocked with the valve shaft through a bevel gear and extends below the stand, and this output rotation shaft is connected to the valve shaft, and a part of the input rotation shaft has a direction in which the valve body is closed. A weight is provided to urge the input rotation shaft, and a braking device is provided at one end of the input rotation shaft to release the braking upon activation of any one of an earthquake sensor, a differential pressure switch, and a manual switch. A drive device is connected to the other end of the input rotating shaft via a clutch consisting of a pair of engaging pawls that engage and disengage by rotation, and the play angle of the engaging pawl of this clutch is adjusted at least between fully opening and fully closing the valve body. The angle between the two is equal to or greater than the angle between the two.

An embodiment of this invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, 1 is a valve box of a normal butterfly valve, and 2 is its valve shaft, which is vertical in the illustrated example. Further, a disk-shaped valve body 3 is fixed to the valve shaft 2.

A is the emergency shutoff device of this invention, 4 is its stand, and 5 is a machine box fixed on the stand 4.

A horizontal input rotating shaft 6 is installed inside the machine box 5.
One end of this input rotating shaft 6 passes through a bracket 7 provided on one side of the machine box 5, and an operating lever 9 having a weight 8 is fixed thereto. Further, a vertical output rotation shaft 10 is attached to the lower part of the machine box 5, and the output rotation shaft 10 and the input rotation shaft 6 are interlocked by a bevel gear 11, and the output rotation shaft 10 is passed through the stand 4 and moved downward. It is extended and connected to the valve shaft 2 by a detachable joint B with bolts, etc., and when the valve body 3 is fully open, the operating lever 9 is tilted upward, and the weight 8 is applied to the valve shaft 2 in the fully closing direction. so as to apply the rotational force of

Reference numeral 12 denotes an electromagnetic brake as an example of a braking device provided on the outside of the bracket 7. This brake 12 brakes the input rotation shaft 6. When the power is not applied, the brake 12 brakes the input rotation shaft 6 so that it does not rotate, and when the power is applied, the brake is released and the input rotation shaft 6
It is becoming more and more free.

An earthquake sensor 14, a differential pressure switch 15, and a manually operated switch 16 are connected in parallel between the electromagnetic brake 12 and its power source 13, and the earthquake sensor 14 closes when it senses a seismic intensity higher than the set value. The differential pressure switch 15 has a built-in switch, and the pressure difference between the high pressure side pipe 17 and the low pressure side pipe 18, which are installed before and after an orifice placed in the pipe line upstream or downstream of the valve box 1, reaches a set value. It has a switch that closes when. A bonnet 19 is fixed to the other side of the machine box 5, and the other end of the input rotating shaft 6 penetrates into the bonnet 19. Further, a drive device 20 is fixed to the outside of the bonnet 19, and this drive device 20 is, for example, a worm speed reducer. A handle 21 or a prime mover such as an electric motor, a hydraulic motor, or an air motor is attached to the input shaft of this drive device, and its output shaft is concentrically opposed to the end of the input rotating shaft 6 as a set shaft 22.

Reference numeral C designates a clutch for engaging and disengaging the input rotation shaft 6 and the set shaft 22, and is composed of a clutch member 23 fixed to the input rotation shaft 6 and a clutch member 24 fixed to the set shaft 22, as shown in FIG. Both clutch members 23, 24 are provided with engaging pawls 25, 26, respectively, and in the embodiment, these pawls 25, 26 are provided at an angle of 90 DEG as shown in FIG. Therefore, assuming that the valve body 3 and the input rotating shaft 6 rotate at the same time, and the opening/closing angle of the valve body 3 is β, the play angle α of the clutch will be 180°.

FIG. 3 shows a case where the valve stem 2 is oriented horizontally. In this case, the machine box 27 is attached to one side of the valve box 1, and this machine box 2
One end of the valve shaft 2 is made to protrude into the interior of the valve shaft 7. This machine box 27
The vertical intermediate shaft 28 and the valve shaft 2 are rotatably attached to the valve shaft 2.
are interlocked by a bevel gear 29 to form an interlocking mechanism, and the upper end of this intermediate shaft 28 is fixed to the lower end of the output rotating shaft 10 by a joint B. The mechanism above the output rotating shaft 10 is exactly the same as in FIGS. 1 and 2.

The embodiment of this invention has the above structure, and the valve body 3
is fully opened in the clockwise direction as shown in FIGS. 5 to 9, and suppose that the center of the clutch C
The effect will be explained assuming that it is aligned with the center of .

In FIG. 5, the valve body 3 is fully closed, and at this time, the engaging pawl 25 on the rotating shaft 6 side that is interlocked with the valve shaft 2 is in contact with the engaging pawl 26 on the lower set shaft 22 side. In this state, close the switch 16 in FIG.
the set shaft 22 using the handle 21 etc.
When the pawl 26 is rotated clockwise, this pawl 26
The claw 25 is pushed around and the valve body 3 is fully opened as shown in FIG. 6. At this time, the lever 9 is also turned obliquely upward as shown in FIG. 2, and the weight 8 is lifted. After setting the valve body 3 fully open in this way, switch 16
is opened, the electromagnetic brake 12 is activated to restrain the rotating shaft 6, and the handle 21 is used to return the pawl 26 to its original position as shown in FIG.

In this state, earthquake sensor 1 may be activated due to an earthquake or other cause.
When switch 4 or differential pressure switch 15 is automatically closed and electromagnetic brake 12 is released, lever 9
is rotated by the weight of a weight 8, and a rotating shaft 6 integrated with this rotates.
rotates, the output rotating shaft 10 rotates via the bevel gear 11, and in the case of FIG. 1, the valve shaft 2 directly connected to the output rotating shaft 10 rotates to fully close the valve body 3 as shown by the chain line in FIG. shall be. In addition, in the case of Fig. 3, the output rotation shaft 10
The rotation of the valve shaft 2 via the intermediate shaft 28 and bevel gear 29
is transmitted, and the valve body 3 is fully closed.

In addition, when checking the operation, first fully open the valve body 3 and restrain the output rotation shaft 6 with the electromagnetic brake 12, as in the previous case, and then tighten the claw 26 approximately 45 degrees as shown in Fig.
When the switch 16 is returned and the switch 16 is closed, the electromagnetic brake 12 is released and the valve body 3 rotates in the closing direction, but after turning approximately 45 degrees, the pawl 25 hits the pawl 26 as shown in Figure 9, and the valve body 3 is closed. It stops in a half-open position. Therefore, the operating state of the valve body 3 by the weight 8 can be known without stopping the flow of water to the downstream side.

As mentioned above, this idea incorporates an emergency shutoff device consisting of a weight into the machine box on the upper stand, which is separate from the valve box, and connects the vertical output rotating shaft, which is interlocked via a bevel gear, to the valve shaft. As a result, the emergency shutoff device can be easily attached to the existing valve. In particular, an existing butterfly valve that has a stand above the valve box and an opening/closing device installed thereon can be converted into a valve with an emergency shutoff device by simply replacing the stand.

Furthermore, since the emergency shutoff device is installed above the valve box via the vertical output rotating shaft, it can be used in locations where the valve box may be submerged in water.

Furthermore, when setting the emergency cutoff device, the clutch is engaged, a braking device such as an electromagnetic brake is released, the input rotation shaft is rotated by the drive device, the weight is rotated to the desired position, and then the input rotation is rotated by the braking device. Since it is only necessary to restrain the shaft and leave the clutch free, it is extremely easy to open the valve body, that is, to set up the emergency shutoff device.In addition to the above-mentioned effects, this invention also has the advantage of The play angle of the engagement pawl is set to be the same as or greater than the angle between fully open and fully closed the valve body, so once the valve body is fully open, the clutch's engagement pawl is opened at an intermediate opening. By setting it in the engaged position and releasing the braking device arbitrarily using a manual switch, it is effective to check the operating status of the emergency shutoff valve in the event of an abnormality without stopping water flow downstream. .

In addition, in the emergency shutoff device using the embodiment shown in FIG. 3, the output rotary shaft and the valve shaft of the emergency shutoff device of this invention are connected via a joint, an intermediate shaft, and an interlocking mechanism between the output rotary shaft and the valve shaft. Since it can be connected, the same effect as described above can be obtained even for valves with horizontal valve stems, and it is especially easy to install when installing an emergency shutoff device to an existing valve or when installing a new valve with an emergency shutoff device. Even if the space for the pit is small, there is no need to expand the pit, so installation is easy.

In addition, in the embodiment shown in FIG. 1, the valve shaft 2 and the output rotating shaft 10 can be made into one, and the joint B can be omitted. Also, in the case of the embodiment shown in FIG. 3, the output rotating shaft 10 and the intermediate shaft 28 can be made into one, and the joint B can be omitted.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view showing the state in which the emergency shutoff device of this invention is used; Fig. 2 is a partially cutaway side view of the same as the above; Fig. 3 is a partially longitudinal side view showing another example; The figure is a perspective view of the clutch, and FIGS. 5 to 9 are explanatory diagrams of the operation of the clutch. 1... Valve box, 2... Valve stem, 3... Valve body, 4...
Stand, 5...Machine box, 6...Input rotating shaft, 8...
... Weight, 9 ... Operating lever, 10 ... Output rotating shaft, 11 ... Bevel gear, 29 ... Bevel gear, 12 ...
Electromagnetic brake, 14... Earthquake sensor, 15... Differential pressure switch, 16... Manual switch, 20... Drive device, 22... Set shaft, 23, 24... Clutch member, 25, 26... Engagement Claw, 28... intermediate shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a valve that opens and closes the valve body by rotating the valve stem, a machine box is provided on a stand provided above the valve box, a horizontal input rotating shaft is attached to this machine box, and the input A vertical output rotation shaft is provided which is interlocked with the rotation shaft via a bevel gear and extends downward from the stand, the output rotation shaft is connected to the valve shaft, and the valve body is closed to a part of the input rotation shaft. A weight is provided to bias this input rotation shaft in the direction of
Similarly, one end of the input rotation shaft is equipped with a control device that releases braking by the operation of an earthquake sensor, differential pressure switch, or manual switch, and the other end of the input rotation shaft is equipped with a control device that releases the brake by rotation. The driving device is connected through a clutch consisting of a pair of engagement claws, and the play angle of the engagement claws of this clutch is at least equal to or greater than the angle between fully open and fully closed the valve body. An emergency shutoff device for the valve body. 2. The output rotation shaft and the valve shaft are connected to each other through one or more of the following: a removable joint between the output rotation shaft and the valve shaft; an intermediate shaft; and an interlocking mechanism using a bevel gear for interlocking with the horizontal valve shaft. The emergency shutoff device for a valve body according to claim 1, which is characterized in that the valve shaft is connected to each other.