JPS6234955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid control device for a pump, and more particularly to a fluid control device that makes it possible to control the amount of flow into a pressure tank.

[Conventional technology]

A conventional fluid control device in which a pressure tank is connected to a water supply path on the discharge side of a pump is configured to open and close the pump by detecting the pressure inside the pressure tank with a pressure switch. This pressure tank is simply connected to the water supply path, and the pressure switch operates the pump when the pressure in the pressure tank becomes high and stops the pump when it becomes low.

[Problem that the invention seeks to solve]

In such a fluid control device, it is necessary to increase the volume of the pressure tank connected to the fluid control device in order to make the operation cycle appropriate. In other words, if the volume of the pressure tank is made small, the pressure inside the pressure tank will rise almost in line with the pump's discharge pressure, which will cause the pressure switch to open and close frequently, which will shorten the life of the pump. The point was hot.

If the volume of the pressure tank is increased, there are problems such as an increase in the price of the pressure tank and an increase in the installation space of the fluid control device.

[Means for solving problems]

The present invention was made in order to solve this problem while ensuring normal water supply performance.A pressure tank 6 is connected to the water supply path 10 on the discharge side of the pump 4, and the pressure tank 6 is connected to the water supply path 10 on the discharge side of the pump 4. In a fluid control device provided with a switch 26 for opening and closing the pump 4, the pressure tank 6 is connected to the water supply path 10 via a pressure tank valve 21, and the closed state of the (pressure tank) valve 21 is connected to the water supply path 10. a contracted flow path 20 that connects the water supply path 10 and the pressure tank 6;
and a resistance valve element 11 for controlling the opening and closing of the pressure tank valve 21 is provided upstream of the pressure tank valve 21 and the contraction channel 20, and when the pressure tank valve 21 is opened, the switch 26 is activated. Open,
Further, the fluid control device is characterized in that the switch 26 is arranged so as to close when the pressure tank valve 21 is closed.

[Effect]

According to this fluid control device, when the switch 26 is closed and the pump 4 is operated, the pressure tank valve 21 is closed and water is stored in the pressure tank 6 through the contraction channel 20 in this state, so that the pressure tank 6 side The pressure rise of the pump 4 is delayed from the pressure rise on the water supply path 10 side. Thereby, a normal operating cycle can be obtained even if the pressure tank 6 is made smaller. Moreover, when the pressure tank valve 21 opens, the switch 26 opens and the pump 4 stops, and water is supplied from the pressure tank 6 in this state, so that the water is hardly affected by the pressure tank valve 21 and the contracted flow path 20. Regular water supply is available.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

FIG. 1 is a diagram of a pump system equipped with the fluid control device of the present invention. Water is supplied from a water source 2 to a faucet 5 by a pump 4 via a check valve 3. A control switch 1 is provided on the discharge side of the pump 4 in this water supply path. This control switch 1 stops the pump 4 when the amount of water used at the faucet 5 falls below the set water amount Q _OFF , and when the water pressure at the control switch 1 falls below the set pressure P _ON while the pump 4 is stopped. Then, the pump 4 is started. The pressure tank 6 has the purpose of slowing down the frequency of starting and stopping of the pump 4 due to its water storage capacity.
It is connected to the.

FIG. 2 is a longitudinal section of the control switch 1. The valve case 7 has a pump side connection port 8 and a faucet side connection port 9.
has. A water passage 10 is formed, and this water passage 10 constitutes a part of the water passage on the discharge side of the pump 4. A low resistance valve body 11 is disposed in the middle of this water passage 10. This resistance valve body 11 is biased by a spring 12 so as to be pressed against a valve seat 13 formed in the water passage 10, and even when the valve is closed in this way, the resistance valve body 11 is The cutout groove 14 allows some water to leak. Water passage 10 of this resistance valve body 11
The relationship between the resistance ΔP and the discharge amount Q of the pump 4 is expressed by a characteristic curve shown in FIG. That is, when the amount of water Q is small, the resistance valve body 11 is pressed against the valve seat 13, and due to the resistance of the notch groove 14, it exhibits a resistance characteristic as shown in part a of the curve in FIG. Further, when the water amount Q increases and the spring 12 can no longer resist the dynamic pressure of the water, the resistance valve body 11 opens.
As shown in part b of the curve in FIG. 3, the resistance characteristic is balanced with the elasticity of the spring 12. The valve case 7
A switch case 16 is fixed to the upper part of the valve case 7 via a first diaphragm 15, and a cover 18 is integrally fixed to the valve case 7 by screws 19 above the switch case 16 via a second diaphragm 17. A pressure tank valve 2 is provided on the valve case 7 side of the first diaphragm 15.
1 is installed. A pressure chamber 22 is formed by the first diaphragm 15 and the valve case 7. This pressure chamber 22 is communicated with the downstream side of the resistance valve body 11 of the water passage 10 and is opened and closed by a pressure tank valve 21. A notched groove 20 is formed in the pressure tank valve 21, and communication is maintained through this notched groove 20 even when the pressure tank valve 21 is closed. This notched groove 20 constitutes a contracted flow path.

A pressure tank valve 21 is connected to this first diaphragm 15.
By the screw 23 that attaches the rod 24 to the other side.
is installed. The pressure tank valve 21 and the rod 24 move up and down together with the diaphragm 15. The switch case 16 has a fixed contact piece 25a partially protruding into the case and a corresponding movable contact piece 25b.
A switch 26 having a switch 26 is fixedly installed, and when the rod 24 is lowered, the movable contact piece 25b is pressed against the fixed contact piece 25a, so that electricity can be supplied. Threaded part 2 fixed on the top of the rod 24
A spring seat 28 is arranged in an adjustable manner at 7.
Disk 2 that moves by being pushed by the second diophram 17
9 and is held by a spring 30. A resistance valve prepressure chamber 32 is formed between the second diaphragm 17 and the cover 18 and communicates with the upstream side of the resistance valve body 11 of the water passage 10 via a communication passage 31. Also,
The pressure chamber 22 is connected to the first
It is connected to a pressure tank 6 shown in the figure.

FIG. 4 is a pump characteristic diagram showing the relationship between pump discharge amount Q and discharge pressure P. control switch 1
The flow rate at which the switch 26 opens Q _OFF and the pressure at which the switch 26 closes P _O
N are Q _OFF and P _ON respectively shown in FIG.
ΔP is the resistance pressure difference of the resistance valve body 11 shown in FIG.

Next, the operation of this fluid control device will be explained with reference to FIGS. 5 to 8. Note that W indicates water flow.

FIG. 5 shows the state before the pump 4 is powered on. Since the resistance valve body 11 is closed and no pressure is applied to the first and second diaphragms 15 and 17, the disk 29 and the valve 21 are pushed upward and downward by the spring 30, respectively. At this time, the switch 26 is closed, and by turning on the power, the pump 4
starts. Note that the pressure receiving area of the first diaphragm 15 is slightly larger than that of the second diaphragm 17, and if the pressure chamber 22 and the resistance valve chamber 32 have the same pressure, the pressure receiving pressure of the first diaphragm 15 will be larger.

FIG. 6 shows a state when the pump 4 is started, the discharge pressure P becomes sufficiently high, and the discharge flow rate is larger than Q _OFF . first and second diaphragms 15,
Pressure is applied to 17 to compress the spring 30, but the internal pressure of the resistance valve front pressure chamber 32 becomes greater than that of the pressure chamber 22 by the resistance caused by the resistance valve body 11, and as a result, the The pressure received by the second diaphragm 17 becomes greater than the pressure received by the first diaphragm 15, and both the disk 29 and the pressure tank valve 21 are pushed down. Therefore, switch 26 remains closed and pump 4 continues to operate. At this time, the water passage 10 and the pressure chamber 22 are connected to the pressure tank valve 2.
1. Therefore, when the discharge pressure P of the pump 4 increases, the amount of water flowing into the pressure tank 6 is communicated only through the notched groove 20 formed in the notched groove 20.
Since the pressure is limited and reduced, the rise in pressure within the pressure chamber 22 is delayed, and the frequency of starting and stopping of the pump 4 can be slowed down by lengthening its driving time.

Continuing from the state shown in FIG. 6, the faucet 5 is closed,
Figure 7 shows a state where the water amount Q has become less than Q _OFF . As shown in part a of the characteristic curve in FIG. 3, when the amount of water becomes less than Q _OFF , ΔP decreases rapidly, so the pressure received by the first diaphragm 15 becomes greater than the pressure received by the second diaphragm 17. As a result, the disk 29 and the pressure tank valve 21 are pulled upward, the switch 26 is opened, and the pump 4 is stopped.

Thereafter, the water accumulated in the pressure tank 6 is gradually released from the faucet 5, and the pressure gradually decreases, as shown in FIG. 8. Because the receiving pressure of the first and second diaphragms 15 and 17 decreases, the disk 2
9 and the rod 24 are separated by the spring 30, but since the receiving force of the first diaphragm 15 is greater than the receiving force of the second diaphragm 17, the disk 29 remains pressed upward.
Switch 26 is still open. Further spring 30
When the pressure decreases to a pressure P _ON where the elasticity of the pump 4 and the pressure received by the first diaphragm 15 are balanced, the state shown in FIG. 5 is returned and the pump 4 is started again.

The operating cycle T _C when the pump 4 performs automatic operation while repeatedly starting and stopping is given by the sum of the operating time T _ON and the stopped time T _OFF , and is expressed as in the following equation.

T _C =T _OC +T _OFF The operating time T _ON is the time during which water pressurized by the pump 4 flows into the pressure tank 6 and the pressure inside the pressure tank 6 increases. The stop time T _OFF is from the pressure tank 6 to the faucet 5.
This is the time during which water is being released. During the operating time T _ON , the flow rate flowing into the pressure tank 6 is restricted by the notch groove 20 of the pressure tank valve 21. Therefore, the operating time T _ON can be lengthened, and the operating cycle T _C can be made longer. In this way, the size of the pressure tank 6 can be reduced. Therefore, the pressure tank can be made inexpensive, the installation area can be reduced, and the entire pump system can be made compact. In addition, the pressure tank valve 21 is open during the stop time T _OFF of the pump 4 and does not restrict the water discharged from the pressure tank 6, which causes a drop in the pressure of the faucet 5 and a decrease in the amount of water supplied at this time. Proper automatic driving is possible without any problems. Furthermore, while the pressure tank valve 21 is closed and water is flowing in through the notch groove 20,
Since the notched groove 20 acts as a resistance, the pressure in the pressure chamber 22 is kept lower than the pressure in the pump side connection port 8 and the pump 4 in the faucet side connection port 9.
The first diaphragm 15 can be stably maintained in the closed position of the switch 26, which has the effect of stably maintaining the operation of the switch mechanism.

In this embodiment, the flow rate to the pressure tank 6 is restricted by the cutout groove 20 provided in the pressure tank valve 21. Similar effects can also be obtained by other means.

〔Effect of the invention〕

According to the present invention, even if the volume of the pressure tank 6 is reduced, the operation cycle of the pump 4 can be made appropriate, and thereby the pressure tank can be made inexpensive, and at the same time, the pressure tank can be made inexpensive. It is possible to provide a fluid control device that can reduce the installation space and also can ensure normal water supply performance.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a pump system equipped with the fluid control device of the present invention, and FIG. 2 is a reduced sectional view of the same fluid control device.
Fig. 3 is a resistance characteristic diagram of the resistance valve body of the same fluid control device, Fig. 4 is an explanatory diagram of the set pressure and flow rate of the pump in the same fluid control device, and Figs. 5, 6, 7, and 8 are FIG. 2 is a schematic diagram illustrating the operation of the fluid control device. 1...control switch, 4...pump, 5...faucet, 6
...Pressure tank, 10...Water passage (water supply route), 11
...resistance valve body, 14...notch groove, 15, 17...first,
Second diaphragm, 20... Notch groove (contraction channel), 2
1...Pressure tank valve, 26...Switch.

Claims (1)

[Claims] 1 A pressure tank 6 is connected to the water supply path 10 on the discharge side of the pump 4, and the pump 4 is
In a fluid control device including a switch 26 for opening and closing, the pressure tank 6 is connected to the water supply path 1.
0 through a pressure tank valve 21, and bypasses the closed state of the pressure tank valve 21 to communicate the water supply path 10 and the pressure tank 6.
0, and a resistance valve element 11 for controlling the opening and closing of the pressure tank valve 21 is provided upstream of the pressure tank valve 21 and the contraction path 20, and when the pressure tank valve 21 opens, the switch 26 A fluid control device characterized in that the switch 26 is arranged so that the pressure tank valve 21 is opened and the switch 26 is closed when the pressure tank valve 21 is closed.