JP3208622B2 - Pressure control valve device for fire extinguishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic alarm valve for a fire extinguishing system, and more particularly to a pressure control valve device for a fire extinguishing system that automatically adjusts the pressure of a secondary flow path of the valve. is there.

[0002]

2. Description of the Related Art A pressure control valve device of this kind monitors a pressure of a secondary side (or a primary side) of a main valve of a simultaneous opening type which opens or shuts off a pipeline in a piping system. And a pressure regulating pilot for adjusting the opening (lift) of the valve so as to maintain a predetermined pressure.

[0003]

However, as the size of this valve becomes smaller, it becomes more difficult to adjust the pressure with a pressure regulating pilot. With this valve, it was impossible to adjust the pressure by repeatedly opening and closing the valve. This phenomenon is caused by the relationship between the opening degree of the main valve and the flow path diameter (in the simultaneous opening valve type, the flow path diameter is considerably large even if the valve opening degree is small) and the opening / closing speed of the main valve. It was due to not being able to be slow enough.

The present invention has been made in order to solve such a problem, and the opening degree and the opening degree of the valve can be reduced even if the size of the valve is reduced.
An object of the present invention is to provide a pressure regulating valve device that can eliminate the relationship between the flow path diameters and can sufficiently reduce the opening / closing speed.

[0005]

According to the present invention, there is provided a pressure regulating valve device comprising: a motor; a speed reducing means for reducing a rotation speed of the motor; and a flow passage opening when the motor rotates in one direction. An opening / closing means for shutting off the flow path when the motor rotates in the other direction; and a first pressure provided in the secondary flow path of the opening / closing means, wherein the pressure of the secondary flow path is set to a first pressure. In the following cases, the motor is rotated in one direction, and when the pressure in the secondary flow path is equal to or higher than a predetermined second pressure (first pressure <second pressure), the motor is rotated in the other direction. Pressure detecting means.

The pressure detecting means includes a pressure chamber communicating with a secondary side flow path of the opening / closing means, an expansion / contraction partition provided in the pressure chamber, which expands and contracts in a vertical direction according to the pressure in the pressure chamber. A rod that is fixed and descends when the telescopic partition extends and rises when the telescopic partition contracts, and a first pressure switch that rotates the motor in one direction when the rod separates and returns when pressed by the rod. A second pressure switch for rotating the motor in the other direction when pressed by the rod and returning when the rod is released.

[0007]

In the present invention, when the pressure in the pressure chamber communicating with the secondary side flow path of the opening / closing means becomes equal to or lower than the first pressure, the expansion / contraction partition of the pressure chamber of the pressure detecting means extends downward, and the rod moves with this. To descend from the first pressure switch and restore the switch. By the return of the first pressure switch,
For example, a forward current flows through the motor. The motor rotates the valve of the opening / closing means in the opening direction via the speed reduction means, and discharges water to the secondary flow path. When the pressure in the secondary channel increases due to water discharge, the rod increases in accordance with the pressure, depresses the first pressure switch, interrupts the current, and stops the rotation of the motor. When the pressure reaches the second pressure, the rod presses the second pressure switch, so that, for example, a current flows in the opposite direction to the motor. At this time, the motor rotates in the reverse direction and turns the valve in the closing direction to narrow the flow path. When the second pressure switch returns, the current is cut off and the rotation of the motor is stopped. In this way, the pressure in the secondary flow path is maintained at a predetermined value (the range between the first pressure switch and the second pressure switch).

[0008]

FIG. 1 is an explanatory view of the structure of a pressure regulating valve according to an embodiment of the present invention, FIG. 2 is an external view of the pressure regulating valve, FIG. 3 is a diagram of a pressure switch, and FIG. FIG. 6 is a circuit diagram for explaining the operation of the embodiment. In the drawings, reference numeral 1 denotes a ball valve body having a valve element (not shown) formed in a spherical shape, for example, and 2 denotes a ball valve body.
As shown in FIG. 2, the C motor includes a gear 2a for slowly rotating the valve body, limit switches 2b and 2c for detecting opening and closing of the valve body, and the like. The limit switch 2b for full opening is configured such that the projection 2d1 contacts the contact when the valve body of the ball valve body 1 is fully opened. The projection 2d2 of the limit switch 2c for full closing is in contact with the valve body of the ball valve body 1 when the valve body is closed, and the projection 2d2 is separated when the valve body is opened. Reference numeral 3 denotes a remote test valve whose valve is opened / closed based on a remote operation. The remote test valve is a device that simulates discharging of the secondary flow path and checks whether the pressure control valve operates normally.

Reference numeral 4 denotes a drain valve, and reference numeral 5 denotes a two-contact type pressure switch (hereinafter, referred to as a pressure switch) for detecting the pressure in the secondary flow path of the ball valve body 1.
As shown in FIG. 3, micro switches 51 and 52 disposed opposite to each other, a pressure chamber 53 communicating with a secondary-side flow path of the ball valve body 1, and the pressure chamber 53. A bellows 54 (expandable partition) which expands and contracts in the vertical direction in accordance with the pressure of the bellows, a rod 55 for operating the micro switches 51 and 52 according to the amount of expansion and contraction of the bellows 54, a spring 56, and the like.

The micro switch 51 (hereinafter, "PS-
L ”) is for detecting the lower limit of pressure.
As shown in FIG. 4, when the pressure in the pressure chamber 53 reaches, for example, 2.2K, it is pressed by the rod 55, so that its contact is connected to b. Since 55 is separated, the contact returns to a. The microswitch 52 (hereinafter referred to as PS-H) is for detecting the upper limit of the pressure. When the pressure in the pressure chamber 53 is, for example, 2.3 K, the contact point is a because the rod 55 is separated. When the pressure is, for example, 2.5 K or less, the contact is connected to b since the rod 55 is pressed by the rod 55. In this embodiment, the micro switch 51 corresponds to the first pressure switch, and the micro switch 52 corresponds to the second pressure switch.

Reference numeral 6 denotes a terminal box, and the primary side is connected to a pump control panel (not shown). Reference numeral 7 denotes a diode, 8 denotes a standby power supply, which includes a switch 8a, a battery 8b, and the like. The switch 8a is turned on when the commercial power supply is cut off.

The operation of the pressure regulating valve configured as described above will be described with reference to FIG. The connection state of PS-L51 and PS-H52 in this figure indicates that the pressure in the secondary flow path of the ball valve body 1 is within a predetermined range (2.0K to 2.5K), The connection state of the switches 2a and 2b indicates that the valve body of the ball valve body 1 is fully closed. If water leaks from the sprinkler head or the like, the pressure in the secondary flow path decreases, so the pressure in the pressure chamber 53 formed in the pressure switch 5 also decreases, and the bellows 54 and the rod 55 descend accordingly. . When the pressure drops to the lower limit value of 2.0K, the rod 55 separates from the PS-L51, and the PS-L51 returns the contact to the a side and returns to the D position.
The C motor 2 is connected to a power supply (24 VDC). In this case, the DC motor 2 rotates forward to rotate the valve body of the ball valve main body 1 in the opening direction, and supplies primary-side water to the secondary-side flow path. At this time, the limit switch 2c returns to the side b by opening the valve body. When the pressure in the secondary channel increases due to the water discharge, the pressure in the pressure chamber 53 increases in accordance with the pressure increase, and pushes up the rod 55 together with the bellows 54. When the pressure reaches 2.2K, the rod 55
Presses the PS-L51 to switch its contact to the b side,
The circuit between the DC motor 2 and the power supply is shut off to stop the valve body in the open state.

When the pressure in the pressure chamber 53 further increases and reaches the upper limit value of 2.5 K, the rod 55 presses the PS-H 52 by the pressure to switch its contact to the b side, and the DC motor 2 And the power supply. In this case, DC
The motor 2 rotates in the reverse direction to close the valve body,
Narrow the flow path to the secondary flow path. At this time, since the pressure in the pressure chamber 53 formed in the pressure switch 5 also decreases, the rod 55 of the pressure switch 5 lowers according to the decrease in the pressure. When the pressure drops to 2.3K, P
S-H52 returns the contact from b to a to cut off the current,
The rotation of the DC motor 2 is stopped.

[0014]

As described above, according to the present invention, two two-contact type microswitches are combined and used as pressure detecting means, so that the circuit configuration is simpler than that of a pressure sensor or the like which requires an arithmetic circuit and a control circuit. It is easy to assemble and easy to maintain. Also, since the rotation of the motor opens and closes the valve via the deceleration means, the opening and closing speed of the valve can be sufficiently reduced, so that the pressure is adjusted without overshooting in any direction of opening and closing of the valve. The effect has been obtained. Further, since the auxiliary power supply is connected to the pressure regulating valve device, the pressure regulation of the secondary flow path can be continuously performed even when the normal power supply is cut off.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view of a pressure regulating valve showing one embodiment of the present invention.

FIG. 2 is an external view of a pressure regulating valve.

FIG. 3 is a configuration diagram of a pressure switch.

FIG. 4 is a circuit diagram for explaining the operation of the pressure regulating valve.

[Explanation of symbols]

 Reference Signs List 1 ball valve body 2 DC motor 2a gear 2b limit switch 2c limit switch 3 remote test valve 5 pressure switch 51 micro switch 52 micro switch

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A62C 27/00-39/00 F16K 31/00-31/05 G05D 16/00-16/20

Claims (3)

(57) [Claims] A motor, a speed reducing means for reducing the rotation speed of the motor, a flow path opened when the motor rotates in one direction, and a flow path opened when the motor rotates in the other direction. Opening and closing means for shutting off, provided in a secondary flow path of the opening and closing means, when the pressure of the secondary flow path is equal to or less than a first pressure set in advance, the motor is rotated in one direction, Fire extinguishing equipment characterized by comprising pressure detecting means for rotating the motor in the other direction when the pressure in the secondary flow path is equal to or higher than a preset second pressure (first pressure <second pressure). Pressure regulating valve device. 2. The pressure detecting means according to claim 1, wherein
A pressure chamber communicating with the next-side flow path, a telescopic partition provided in the pressure chamber, which expands and contracts in a vertical direction in accordance with the pressure in the pressure chamber, and is fixed to the telescopic partition. A rod that rises when contracted, a first pressure switch that rotates the motor in one direction when the rod separates and switches when pressed by the rod, and a motor that switches the motor in the other direction when pressed by the rod Rotate to
The pressure regulating valve device for fire extinguishing equipment according to claim 1, further comprising a second pressure switch that returns when the rod is separated. 3. A pressure regulating valve for a fire extinguishing system according to claim 1, further comprising: a standby power supply; and a switch for connecting the standby power supply and the pressure detecting means when a normal power supply is cut off. apparatus.