JPH064072Y2 - Water pump priming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a priming device for a water supply pump such as a fire pump.

[Prior Art] As shown in FIG. 2, a water supply pump b to which a priming device a is attached includes a casing d having a pump chamber c therein,
A suction port e and a discharge port f which communicate with the pump chamber c, respectively.
It has and.

The priming device a provided in such a water supply pump b
As shown in FIG. 2, has a casing 1 provided integrally with a casing d on the suction port e side of the water supply pump b. One end of the casing 1 is connected to a communication port 1A that communicates with a pump chamber c of the water supply pump b, and the pump chamber c
An exhaust passage 2 is formed for discharging the internal air to the outside. A diaphragm type water shutoff valve 3 and a check valve 4 are arranged in the middle of the exhaust passage 2, and a vacuum pump 5 is attached to the end of the exhaust passage 2. The diaphragm-type water stop valve 3 is for preventing the inhalation water from entering the vacuum pump 5, and the check valve 4 is for stopping the backflow in the exhaust passage 2 when the vacuum pump 5 is stopped. The vacuum pump 5 serves to prime the water supply pump b.

The diaphragm type water shutoff valve 3 is formed on the side of the check valve 4 which is a part of the exhaust passage 2 and is adjacent to the valve chamber 3A, which is formed by expanding a part of the exhaust passage 2. It has a negative pressure chamber 3B and a valve hole 3C formed so as to connect the valve chamber 3A and the negative pressure chamber 3B. These valve chambers 3A
The negative pressure chamber 3B and the valve hole 3C are both formed in the casing 1. An opening 3D is formed in a portion of the valve chamber 3A facing the valve hole 3C, and a plug 3E is screwed into the opening 3D. A valve seat 3F is formed around the opening of the valve hole 3C on the valve chamber 3A side, and a valve body 3G is housed in the valve chamber 3A so as to face the valve seat 3F. A valve rod 3H penetrating the valve hole 3C is fixed to the valve body 3G, and the valve rod 3H penetrates the opening 3I of the negative pressure chamber 3B formed in the casing 1. A diaphragm 3J that closes the opening 3I is fixed to the outside of the opening 3I by a diaphragm pressing cap 3K. Diaphragm retainer cap 3K and diaphragm 3J
The space surrounded by and is a positive pressure chamber 3L. The diaphragm pressing cap 3K is provided with a communication hole 9A that communicates with the atmospheric pressure so that the positive pressure chamber 3L has the same positive pressure as the atmospheric pressure.

The check valve 4 includes a valve seat 4A arranged in the exhaust passage 2 of the casing 1, a valve hole 4B forming a part of the exhaust passage 2 and penetrating the valve seat 4A, and air flowing through the exhaust passage 2 It has a ball valve body 4C that operates to close the valve hole 4B when an attempt is made to flow back to the pump chamber c side of the water supply pump b.

The vacuum pump 5 is attached to the outlet side of the exhaust passage 2 via the first pipe joint 6 and the second pipe joint 7. The vacuum pump 5 has a pump chamber 5A therein, and a rotor 5C having a plurality of blades 5B radially arranged therein is rotatably accommodated in the pump chamber 5A.

An automatic drain means 8 is provided in the exhaust passage 2 adjacent to the check valve 4 on the vacuum pump 5 side. This automatic drain means 8 is formed in the casing 1 with a valve seat 8B provided by opening the valve hole 8A in the exhaust passage 2, and the valve hole 8 is formed at one end.
A valve chamber 8D having a hole 8C communicating with the exhaust passage 2 via A and having the other end opened to the outside, and a valve hole 8A which is housed in the valve chamber 8D and has a negative pressure in the exhaust passage 2 is automatically opened. It is composed of a ball valve body 8E which is closed.

In such a conventional priming apparatus a, first, the vacuum pump 5
When the inside of the exhaust passage 2 is brought to a negative pressure state by activating the appropriate means, the check valve 4 opens, and the diaphragm 3J of the water shutoff valve 3 is deformed so as to project into the negative pressure chamber 3B and stopped. The water valve 3 is opened. When the check valve 4 and the water stop valve 3 are opened in this way, the air in the pump chamber c of the water supply pump b is sucked out by the vacuum pump 5 and the water is pumped. At this time, the discharge port f of the water supply pump b is blocked by an appropriate means. Further, when the diaphragm 3J is deformed so as to project into the negative pressure chamber 3B, the positive pressure chamber 3L is decompressed by that amount, but air is sucked from the communication hole 3A. The chamber 3L is kept at atmospheric pressure.

[Problems to be Solved by the Invention] However, in such a conventional priming device, when the check valve 4 and the priming valve 3 are opened and priming is started, the priming valve 3 opens. Since the negative pressure in the negative pressure chamber 3B is closer to the positive pressure side than before, the pressure of the water shutoff valve 3 is set to a pressure at which the diaphragm 3J is pushed to the negative pressure chamber 3B side by the atmospheric pressure from the positive pressure chamber 3L side. There is a problem in that the opening degree is small and the efficiency of sucking in air is reduced, so that it takes a long time to perform the priming work.

An object of the present invention is to provide a priming device for a water supply pump that can reduce the time required for priming.

[Means for Solving Problems] The present invention will be described based on the embodiment shown in FIG. 1. An exhaust passage 2 having one end connected to a pump chamber c of a water supply pump b.
A vacuum pump 5 is connected to the other end of the exhaust passage 2, and when priming water is sucked into the exhaust passage 2, the valve body 3G is pushed up by the priming water to close the exhaust passage 2. A water shutoff device for a water supply pump, comprising a diaphragm type water shutoff valve 3 and a check valve 4 for closing an exhaust passage 2 when the vacuum pump 5 is stopped. 3 is a positive pressure pressure chamber 3L formed independently of the exhaust passage 2, and one end is connected to the positive pressure pressure chamber 3L and the other end is connected to the positive pressure side portion 5D of the pump chamber 5A of the vacuum pump 5. The positive pressure passage 9 for driving the water shutoff valve for pressurizing the positive pressure chamber 3L to a positive pressure higher than the atmospheric pressure, the diaphragm 3J operated by the pressure change of the positive pressure chamber 3L, and the diaphragm. Structure with valve body 3G that opens and closes the exhaust passage 2 by operating 3J. It is.

[Operation] As described above, the positive pressure chamber 3 of the diaphragm type water shutoff valve 3
L is provided independently of the exhaust passage 2, and the positive pressure chamber 3N
When the positive pressure side portion 5D of the pump chamber 5A of the vacuum pump 5 is connected by the positive pressure passage 9 for driving the water shutoff valve, when the vacuum pump 5 is started to perform priming, the vacuum pump 5 pumps the water supply pump b. The check valve 4 and the water stop valve 3 when the air in the chamber c is sucked
Even if the negative pressure in the exhaust passage 2 is closer to the positive pressure side than before the water shutoff valve 3 is opened, the exhaust of the vacuum pump 5 is positive pressure for driving the water shutoff valve in the positive pressure chamber 3L. The pressure in the positive pressure chamber 3L becomes higher than the atmospheric pressure by being sent through the passage 9, and the diaphragm 3J is pushed out to the negative pressure chamber 3B side by the pressure, so that the opening degree of the water shutoff valve 2 increases and Water can be supplied efficiently and the time required for priming can be shortened.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIG.

The priming device a of the water supply pump of the present embodiment is different from the conventional priming device in that the structure of the water shutoff valve 3 is different from that of the conventional priming device shown in FIG. The different parts will be described.

In the present embodiment, the pressure chamber for driving the valve body 3G of the water shutoff valve 3 is independent of the negative pressure chamber 3B formed in a part of the exhaust passage 2 and the exhaust passage 2 as in the conventional case. And a positive pressure chamber 3L provided therein. The valve rod 3H is configured to penetrate the diaphragm pressing cap 3K in an airtight manner. One end of the water shutoff valve driving positive pressure passage 9 is connected to the positive pressure chamber 3L via a communication hole 9A. The other end of the water shutoff valve driving positive pressure passage 9 is connected to the positive pressure side portion 5D of the pump chamber 5A of the vacuum pump 5. That is, the water shutoff valve driving positive pressure passage 9 has a communication hole 9A formed in the diaphragm pressing cap 3K so as to open to the positive pressure chamber 3L, a nipple 9B attached to the communication hole 9A, and a nipple 9B.
A pipe 9C having one end connected to it (shown by a chain line in FIG. 1), and a nipple 9D connecting the other end of the pipe 9C to a positive pressure side portion 5D of the pump chamber 5A of the vacuum pump 5.
It consists of and.

In order to drive the priming apparatus a of the above embodiment to prime the water supply pump b, first, the drive source for driving the water supply pump b is started. Next, the power of the drive source is connected to the vacuum pump 5 via a clutch or the like to drive the vacuum pump 5. When the vacuum pump 5 is driven in this way, the exhaust passage 2 has a negative pressure, and the exhaust gas of the vacuum pump 5 is sent to the positive pressure passage 9 for driving the water shutoff valve to drive the positive pressure for driving the water shutoff valve. The passage 9 has a positive pressure higher than atmospheric pressure. When the positive pressure passage 9 for driving the water shutoff valve has a positive pressure higher than the atmospheric pressure, the positive pressure chamber 3L of the diaphragm type water shutoff valve 3 has a positive pressure higher than the atmospheric pressure, and the pressure causes the diaphragm 3J to move the valve body. It is deformed into a convex state on the 3G side. At this time, the negative pressure chamber 3B becomes a negative pressure and the positive pressure chamber 3L becomes a positive pressure higher than the atmospheric pressure. Therefore, the diaphragm 3J is larger than the conventional case where only the negative pressure of the exhaust passage 2 is applied. The valve body 3G is deformed into a convex shape.
When the diaphragm 3J is largely deformed in this way, the valve body 3G is separated from the valve seat 3F to a greater extent than before, and the water shutoff valve 3 is opened. When the water shutoff valve 3 is opened, the exhaust passage 2 is opened and the air in the pump chamber c of the water supply pump b is sucked and exhausted to perform priming.

In the case of priming in this way, when the air in the pump chamber c of the water supply pump b is suctioned and exhausted, the positive pressure chamber 3L is pressurized to a positive pressure higher than atmospheric pressure independently of the exhaust passage 2. Therefore, even if the degree of negative pressure in the exhaust passage 2 is closer to the positive pressure side than before the water shutoff valve 3 is opened, it is not affected. Therefore, the opening degree of the water shutoff valve 5 becomes larger than in the conventional case, and efficient water can be delivered.

In particular, in the priming device a of the present embodiment, even if the suction height of the priming water is low and the degree of negative pressure in the exhaust passage 2 does not increase during priming, the water shutoff valve 3 is opened. Since the positive pressure that pressurizes the positive pressure chamber 3L is increased regardless of the suction height of the priming water, the opening degree of the water shutoff valve 3 can be expanded to perform efficient priming, and the time required for priming can be shortened. . As described above, the priming device of the present invention can shorten the time required for priming water, and is therefore suitable for a fire pump that wants to shorten the time until water discharge as much as possible.

In the above embodiment, the valve chamber 3A and the exhaust passage 2 are formed in the casing 1 of the priming device a, but the present invention is not limited to this, and the valve chamber and the exhaust passage are formed in the casing 1. Needless to say, it may be constituted by a tubular body separate from.

[Effects of the Invention] As described above, according to the priming device for the water supply pump of the present invention, the following excellent effects can be obtained.

(A) The positive pressure chamber of the diaphragm type water shutoff valve is provided independently of the exhaust passage, and the positive pressure chamber and the positive pressure side portion of the pump chamber of the vacuum pump are connected by the positive pressure passage for driving the water shutoff valve. Therefore, when the vacuum pump is activated and water is pumped, the check valve and the water stop valve are opened when the vacuum pump sucks, and the negative pressure in the exhaust passage is lower than that before the water stop valve is opened. Even when approaching the positive pressure side, the exhaust gas of the vacuum pump is sent into the positive pressure chamber through the positive pressure passage for driving the water shutoff valve, and the pressure in the positive pressure chamber becomes higher than the atmospheric pressure. Since it is pushed out to the side of the negative pressure chamber, the opening degree of the water shutoff valve becomes large, and the water can be efficiently pumped, and the time required for the water can be shortened.

(B) Even if the height of suction of priming water is low and the degree of negative pressure in the exhaust passage does not rise during priming, the positive pressure that pressurizes the positive pressure chamber to open the water shutoff valve is the priming pressure. Since it can be increased regardless of the suction height, the opening degree of the water shutoff valve can be expanded to efficiently perform the priming, and the time required for priming can be shortened.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing an embodiment of the priming device of the present invention, and FIG. 2 is a partial sectional front view showing a conventional priming device. a ... water supply device, b ... water supply pump, c ... pump chamber of water supply pump, 2 ... exhaust passage, 3 ... diaphragm stop valve, 3G
... Valve body of water shutoff valve, 3J ... Diaphragm, 3L ... Positive pressure pressure chamber of water shutoff valve, 4 ... Check valve, 5 ... Vacuum pump, 5A ... Pump chamber of vacuum pump, 5D ... Of pump chamber of vacuum pump Positive pressure side portion, 9 ... Positive pressure passage for driving the water shutoff valve, 9A ... Communication port.

Claims (1)

[Scope of utility model registration request] 1. A water supply pump has an exhaust passage having one end connected to a pump chamber, the other end of the exhaust passage is connected to a vacuum pump, and the exhaust passage is provided with priming water when sucked. In a priming device of a water supply pump, which is provided with a diaphragm type water shutoff valve for closing the exhaust passage by pushing a valve body by priming water and a check valve for closing the exhaust passage when the vacuum pump is stopped. The diaphragm water shutoff valve has a positive pressure pressure chamber formed independently of the exhaust passage, and one end connected to the positive pressure pressure chamber and the other end being a positive pressure side portion of a pump chamber of the vacuum pump. Connected to the positive pressure passage for driving the water shutoff valve to pressurize the positive pressure chamber to a positive pressure higher than atmospheric pressure, a diaphragm that operates by a pressure change in the positive pressure chamber, and an operation of the diaphragm. To open and close the exhaust passage A water supply pump priming device.