JPS6019995Y2 - Pump filling device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water filling device for a pump that removes air remaining in the pump and introduces water so that the inside of the pump is always filled with water.

This type of water filling device usually has a required head difference between the pump and the vacuum tank and connects them with a single pipe, and uses this head difference to create a buoyancy effect between the air in the pump and the water in the vacuum tank. It promotes replacement, and the larger the diameter of the tube, the better the displacement effect.

However, connecting a large-diameter pipe to the pump must be avoided because it creates a large hole in the pump casing or suction pipe, resulting in a fatal reduction in pump capacity. Due to its use, it had to accept poor replacement efficiency.

In particular, the pump and vacuum tank are generally installed far apart for maintenance and other reasons, and the length of piping tends to become longer, so the above-mentioned tendency becomes more and more pronounced.

Additionally, as the piping length increases, a horizontal piping section is likely to be formed in the middle of the piping, and air accumulates in this horizontal piping section and acts to prevent air replacement. The piping section had to be replaced with slope piping, which added constraints such as the vacuum pump having to be installed higher than necessary relative to the pump.

In view of the above points, the present invention has been developed to ensure smooth air and water exchange even when small diameter pipes are used and the piping length increases, and the above exchange is not hindered even if a horizontal piping section is formed in the piping. Therefore, there is a large degree of freedom in designing piping and vacuum tanks.
The present invention provides a pump filling device that imposes few restrictions on installation space.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings of FIGS. 1 and 2.

The present invention is a water filling device for a pump 1 that introduces water stored in a vacuum tank 2 into the pump 1 to fill the pump 1 with water. a vertical pipe 3 that communicates with
As shown in FIG. 1, the pipe branches off from a part near the connection between the pump 1 and the vertical pipe 3, extends in the horizontal direction, and communicates the vertical pipe 3 with the bottom part 2b of the vacuum tank 2. The vertical pipe 3 is provided with an on-off valve 5 located above the communication portion 3c with the horizontal pipe 4 to open and close the channel of the vertical pipe 3.

To explain this in detail, as shown in FIG. 1, the pump 1 sucks up water from the water layer 6 through the suction pipe 7 and sends it to the destination where it will be used.

The vacuum tank 2 is connected to a vacuum pump 8, and when the water level in the vacuum tank 2 drops to the lower limit water level (LWL), the vacuum pump 8 is automatically started and the water level in the vacuum tank 2 drops to the upper limit water level. (HWL), the vacuum pump 8 is automatically stopped.

One end 3a of a vertical pipe 3 penetrates from the top plate 2c of the vacuum tank 2 and is connected to the top 2a of the vacuum tank 2, and one end 3a of a horizontal pipe 4 is connected to the bottom 2b of the vacuum tank 2. 4a penetrates from the bottom plate 2d of the vacuum tank 2 and is connected thereto.

The other end 3b of the vertical pipe 3 is connected to a portion of the pump 1, that is, the pump casing, where air pockets are likely to occur or to a portion of the pump suction pipe 7 where air pockets are likely to occur, and the other end of the horizontal pipe 4 The portion 4b is connected to the vertical pipe 3 at a position above the pump 1 for horizontal communication.

In this vertical pipe 3, an on-off valve 5 (for example, a solenoid valve in the embodiment) is installed at a position above the communication part 3c with the horizontal pipe 4 and above the upper limit water level (HWL) in the vacuum tank. is provided, and the pipe line of the vertical pipe 3 is linked to the stop and start of the vacuum pump 8 (for example, in response to a signal from a water level detector (not shown) that detects the water level in the vacuum tank 2, When the vacuum pump 8 is in operation, the on-off valve 5 is closed and the upper horizontal piping section 3d of the vertical pipe 3 is opened and closed. This prevents water from being sucked in and pooling inside.

In addition, a valve 12 (manual valve or solenoid valve) is provided in the vertical pipe 3, which is located below the communication part 3c with the horizontal pipe 4 and is closed when the pump 1 is in operation and opened when the pump is stopped. I am wearing it.

Note that a valve 10 is interposed in the middle of the pipe 9 connecting the vacuum tank 2 and the vacuum pump 8, which is opened when the vacuum pump 8 is started or operated, and closed when the vacuum pump 8 is stopped.

Further, the opening/closing operation of this valve 10 may be linked to the starting and stopping of the vacuum pump 8, similarly to the opening/closing valve 5.

In this pump filling device, when the pump 1 is stopped, the valve 12 is opened and the pump 1 is always filled with water so that the pump 1 can be started at any time.When the pump 1 is in operation, the valve 12 is opened. 12 is closed.

That is, as shown in FIG. 1, when the water level drops to the lower limit water level (LWL) of the vacuum tank 2, the water level detector is activated, the on-off valve 5 is closed, and at the same time the vacuum pump 8 is turned on.
The side valve 10 opens, the vacuum pump 8 starts operating, and water is pumped in from inside the pump 1 via the lower part of the vertical pipe 3 and the horizontal pipe 4 due to the suction of the vacuum pump 8, and the water level in the vacuum tank 2 decreases. is rising.

At this time, since the on-off valve 5 is located above the communication part 3c between the vertical pipe 3 and the horizontal pipe 4, the air contained in the water sent from the inside of the pump 1 into the vacuum tank 2 is It does not enter the pipe 4 but rises inside the vertical pipe 3 and accumulates under the closed on-off valve 5.

Therefore, it is possible to prevent air from flowing inside the horizontal pipe 4 and forming an air pocket.

Then, when the water level in the vacuum tank 2 rises to the upper limit water level (HWL), the water level detector is activated again, the vacuum pump 8 is stopped, and at the same time, the valve 10 on the side of the vacuum pump 8 is activated.
is closed, and the on-off valve 5 of the vertical pipe 3 is opened.

When the on-off valve 5 of the vertical pipe 3 is opened, the air accumulated in the vertical pipe 3 below the on-off valve 5 is absorbed into the vacuum tank, and the water level in the vertical pipe 3 becomes the same level as in the vacuum tank 2. Become.

Then, the air generated in the pump 1 in the state shown in FIG.
The water inside is sent into the pump 1 through the lower part of the horizontal pipe 4 and the vertical pipe 3, so that the inside of the pump 1 is always filled with water.

In other words, the air inside the pump 1 is removed and water is introduced, and the air inside the pump 1 and the water inside the vacuum tank 2 are constantly replaced. As mentioned above, this is the part close to the pump 1 after a while, and the substantial displacement operation takes place in the short vertical pipe section between this branch part and the pump 1, so that the displacer tries to come out upward. The resistance of the air bubbles in the pipe is small, so even if the vertical pipe 3 is a small diameter pipe, the air can be easily evacuated upward.

Moreover, the released air reaches directly below the on-off valve 5 without entering the horizontal pipe 4 due to its vertical rise due to its buoyancy.
Water is smoothly replenished from the horizontal pipe 4 to the vertical pipe 3.

When the water in the vacuum tank 2 is replaced with the air in the pump 1 until it reaches the lower limit water level (LWL), the water level detector is activated and the on-off valve 5 is closed, as described above, and at the same time the vacuum pump 8 side The valve 10 is opened, the vacuum pump 8 is started, and the above operation is repeated.

By using the vertical pipe 3 to vent air from the pump 1 and using the horizontal pipe 4 to introduce ice into the pump 1, the air and water pipes are branched, and the vertical The tube 3 facilitates the upward movement of air, thereby facilitating the exchange of air and water.

Further, as mentioned above, no air enters the horizontal pipe 4, which is the horizontal pipe part, and the upper horizontal pipe part 3d of the vertical pipe 3 is mainly used as an exhaust passage for the air accumulated directly below the on-off valve 5. Therefore, regardless of the presence of these horizontal piping sections 4 and 3d, problems caused by air pockets as in the conventional case do not occur.

Next, another embodiment to which the present invention is applied will be described with reference to FIG.

In this embodiment, two pumps 1 are arranged side by side, and each pump 1 is connected to a common vacuum tank 2 as in the above embodiment. , the installation space of the vacuum tank 2 can be saved and it is economical.

In this case, of course, three or more pumps may be connected to one common vacuum tank 2.

Further, in each of the above embodiments, as shown in FIG. 4, the connecting end 4b of the horizontal pipe 4 to the vertical pipe 3 may be gradually inclined upward as it goes toward the distal end side. By doing so, the air inside the pump 1 rising up the vertical pipe 3 can be reliably prevented from flowing into the horizontal pipe 4, and the exchange of water and air may be performed more smoothly.

Furthermore, in each of the above embodiments, the on-off valve 5 may be configured with a check valve as shown in FIGS. When the vacuum pump 8 is activated, the check valve body 5a rises by the suction action of the vacuum pump 8 to close the vertical pipe 3, as shown in FIG. 5, and when the vacuum pump 8 is stopped, the check valve body 5a is the 6th
As shown in the figure, the check valve body 5a descends under its own weight to open the pipe line of the vertical pipe 3, and by doing so, the control device for opening and closing the on-off valve 5 is omitted. In addition, by closing the on-off valve 5 while the vacuum pump 8 is in operation, it is possible to prevent water from being sucked into the upper horizontal piping section 3d of the vertical pipe 3 and pooling therein.

In each of the above embodiments, parts corresponding to those in FIGS. 1 and 2 are given the same reference numerals.

As explained above, the present invention introduces water stored in a vacuum tank into a pump and fills the pump with water. The vertical pipe is provided with a vertical pipe that communicates with the bottom of the vacuum tank, and a horizontal pipe that branches from the middle of the vertical pipe and extends in the horizontal direction to communicate the vertical pipe with the bottom of the vacuum tank. Since an on-off valve is provided above the communication part of the vertical pipe to open and close the pipe line of the vertical pipe, the operation of replacing the air in the pump with the water in the vacuum tank can be performed at the branch part of the horizontal pipe with respect to the vertical pipe and between the pump and the pipe. Since the replacement is substantially carried out in the short vertical pipe length between Operate.

In addition, even if the length of the piping becomes longer because the vertical and horizontal pipes are routed to a remote vacuum tank, the replacement will only end in the short vertical pipe portion close to the pump, as described above, and the effect of the piping length will be Therefore, there are no restrictions on the installation position of the vacuum tank.

Furthermore, for the same reason, even if there is a horizontal piping section in the routed piping, the horizontal piping section will not interfere with the replacement operation, so it is possible to adopt the sloped piping mentioned at the beginning and use this to make the vacuum tank unnecessary. It is not subject to restrictions such as installation at a high height.

Therefore, a high degree of freedom can be ensured in designing the mutual arrangement of the pump, vacuum tank, and piping and in selecting the installation space.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention in an operating state, with Figure 1 being a longitudinal cross-sectional view of the vacuum pump in its operating state, and Figure 2 being a longitudinal cross-sectional view of the vacuum pump in its stopped state. ,
FIG. 3 is a longitudinal cross-sectional view corresponding to FIG. 2 showing another embodiment to which the present invention is applied, FIG. 4 is a longitudinal cross-sectional view of a portion showing still another different embodiment to which the present invention is applied, and FIG. and Fig. 6 shows another embodiment of the on-off valve used in the present invention, Fig. 5 is a longitudinal sectional view showing the vacuum pump in the operating state, and Fig. 6 is a longitudinal sectional view showing the vacuum pump in the stopped state. . 1...Pump, 2...Vacuum tank, 2
a...Top of the vacuum tank, 2b...Bottom of the vacuum tank, 3...Vertical pipe, 3c...
・Communication part, 4...Horizontal pipe, 5...Opening/closing valve, 8...Vacuum pump.

Claims (1)

[Scope of utility model registration request] A water filling device for a pump that introduces water stored in a vacuum tank into the pump to fill the pump with water, comprising: a vertical pipe that rises upward from the pump and communicates the pump with the upper part of the vacuum tank; a horizontal pipe that branches and extends from a midway point near the pump and communicates the vertical pipe with the bottom of the vacuum tank; A water filling device for a pump, characterized in that it is provided with an on-off valve that is positioned to open and close the pipe line of the vertical pipe.