JPS59103996A - Fluid control device - Google Patents

Abstract

PURPOSE:To allow control of an amount of liquid to be induced at an inlet of a pressure tank, by simply adding a valve adapted to open and close together with a pressure responsive member, which is sensible to pressure and flow, to a switch means for starting and stopping an operation of a pump, etc. which means is opened and closed by an operation of the pressure responsive member. CONSTITUTION:When a discharge pressure of a pump becomes sufficiently high, and a discharge flow becomes greater than a flow upon opening of a switch 26 in a control switch means 1, pressure is applied to diaphragms 15 and 17 to compress a spring 30. At this time, an internal pressure of a pressure chamber 32 prior to a resisting valve 11 becomes greater than that of a pressure chamber 22 by a quantity of resistance generated by the resisting valve 11, and accordingly the pressure applied to the diaphragm 17 becomes greater than the pressure applied to the diaphragm 15, thereby pushing down a desk 29 and a valve 21 and continuing to operate the pump with the switch 26 closed. Thus, when the discharge pressure rises, an amount of water to be induced to a pressure tank 6 is controlled to be reduced by a groove 20 formed on the valve 21 and communicating a water flow line 10 with the pressure chamber 22. Accordingly, it is possible to keep long an operation time and an operation period, and make the pressure tank 6 compact.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fluid control device such as a pump, and more particularly to a fluid control device that can operate a switch based on pressure or the like and simultaneously control the amount of flow into a pressure tank. .

[Prior art]

Conventionally, automatic operation of household pumps and other devices often uses a switch mechanism that responds to pressure or flow rate, and a pressure tank to maintain the operation cycle, that is, the start-stop cycle, above a certain level. The tank needed to be large in order to maintain proper operating cycles. However, since the size of the pressure tank directly affects its price and installation space, efforts have been made to make the pressure tank smaller. One method is to install a restrictor at the inlet of the pressure tank and limit the flow of fluid only when it flows into the pressure tank, but equipping such a valve device alone costs f: Increasing flaws: Yes.

[Purpose of the invention]

The present invention has been made in view of the above facts, and it is an object of the present invention to provide a flow rate control device that can control the amount of fluid flowing into a pressure tank by simply adding a simple mechanism.

[Summary of the invention]

The present invention provides a switch mechanism that opens and closes by the operation of a pressure-responsive body that is sensitive to the pressure and flow rate that stops pumps, etc.
A valve that opens and closes together with the pressure-receiving body is provided, and the valve opens and closes the inlet of the pressure tank so as to control the amount of inflow.

[Embodiments of the invention]

Embodiments of the fluid control device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a pump system to which a fluid control switch 1 according to an embodiment of the present invention is applied, in which 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 QOFF, and when the water pressure at the control switch 1 falls below the set pressure PON while the pump 4 is stopped, the pump 4 is stopped. is the beginning u
1. 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, and is connected to the control switch 1.

FIG. 2 is a longitudinal section showing a control switch 1 according to an embodiment of the invention. A water passage 10 is formed between the pump side connection port 8 and the faucet side connection port 9 of the valve case 7, and a resistance valve body 11 is disposed in this water passage 10. The relationship between the resistance ΔP of the resistance valve body 11 and the discharge amount Q of the pump 4 is expressed by a characteristic curve shown in FIG. That is, the resistance valve body 11 is urged by the spring 12 so as to be pressed against the valve seat 13, and even when the valve is closed in this way, the notch groove 14 formed in the valve body 11 Although some water leakage occurs, when the water ff1Q is small, the resistance valve body 11 is pressed against the valve seat 13, and due to the resistance of the notch groove 14, the resistance valve body 11 is pressed against the valve seat 13, as shown in part a of the curve in FIG. It shows similar resistance characteristics. Furthermore, when the spring 12 with a large amount of water Q no longer resists the dynamic pressure of the water, the resistance valve body 11 opens and exhibits a resistance characteristic that is consistent with the elasticity of the spring 12, as shown in part b of the curve 21a. . A switch case 16 is attached to the upper part of the valve case 7 via a diaphragm 15, and a cover 18 is attached via a diaphragm 17 to the screw 1.
9 is integrally fixed to the valve case 7. The diaphragm 15 is adapted to respond to the pressure of a pressure chamber 22 that is opened and closed by a valve 21 located downstream of the resistance valve body 11 and in which a notched groove 20 is formed.
The valve 21 and the rod 24, which are fixedly fixed by screws 23 so as to sandwich the diaphragm 15, move up and down together with the diaphragm 15. A switch 26 having a fixed contact piece 25a and a corresponding movable contact piece 25b is fixed to the switch case 16.
When the movable contact piece 25b is pressed against the fixed contact piece 25a, electricity can be applied. A spring seat 28 is adjustably disposed on a threaded portion 27 fixed to the upper part of the rod 24, and a spring 3o is held between the spring seat 28 and a disk 29 that moves by being pushed by the diaphragm 17. This diaphragm 17 responds to the pressure in a resistance valve front pressure chamber 32 that communicates with the upstream side of the resistance valve body 11 via a communication passage 31.

Further, the pressure chamber 22 can be connected to the pressure tank 6 shown in FIG. 1 via a pressure tank connection port 33.

FIG. 4 is a pump characteristic diagram showing the relationship between pump discharge iQ and discharge pressure P. The flow rate QOP F at which the switch 26 of the control switch 1 opens and the pressure PON at which it closes are determined in the pump characteristic diagram. QOFF, respectively indicated by ,
When the valve is set at the PON position, ΔP is the resistance pressure difference of the resistance valve body 11 shown in FIG.

The detailed operation of the embodiment of the fluid control device according to the present invention configured as described above will be described with reference to FIGS. 5 to 8. Note that W indicates water flow.

FIG. 5 shows the state before the power is turned on to the pump 4. The resistance valve body 11 is closed and no pressure is applied to the diaphragm 15.17, so the disk 29 and the valve 21 are raised by the spring 3o. .

being pushed down. At this time, the switch 26 is closed and the pump 4 is started by turning on the power. The pressure receiving area of the diaphragm 15 is also slightly larger than that of the diaphragm 17, and if the pressure chamber 22 and the resistance valve chamber 32 have the same pressure, the pressure receiving pressure of the diaphragm 15 will be larger.

Figure 6 shows the situation when the pump 4 is started and the discharge pressure P is sufficiently high, and the discharge flow rate is also large, and pressure is applied to the diaphragm 15. Although the spring 30 is compressed by the resistance valve body 11, the pressure chamber 32 in front of the resistance valve is compressed by the resistance valve caused by the resistance valve body 11, rather than the pressure chamber 22.
The internal pressure of diaphragm 1 becomes larger, and as a result, diaphragm 1
Since the pressure received by the valve 7 is greater than the pressure received by the diaphragm 15, both the disk 29 and the valve 21 are pushed down.

Therefore, the switch 25 remains closed and the pump 4 continues to operate. At this time, the water passage 10 and the pressure chamber 22 are connected to the valve 21.
It communicates only through the notched groove 20 formed in the pressure chamber 22. Therefore, when the discharge pressure P of the pump 4 increases, the amount of water flowing into the pressure tank 6 is limited by the notched groove 20 and decreases. The pressure rise is delayed, and the frequency of starting and stopping of the pump 4 can be slowed down by lengthening its driving time.

FIG. 7 shows a state in which the faucet 5 is continuously closed from the state shown in FIG. 6, and the water amount Q has become less than QOF F .

As shown in part a of the characteristic curve in Figure 3, the water amount is Qo
When it becomes less than y p , ΔP decreases rapidly, so the pressure received by the diaphragm 17 also becomes smaller than the diaphragm 1.
The receiving force of 5 is more sensitive, resulting in disk 29,
The valve 21 is pulled upward, the switch 25 is opened and the pump 4 is stopped.

After this, the water accumulated in the pressure tank 6 gradually flows to the faucet 5.
The pressure gradually decreases, but this state can be described as
As shown in the figure. Since the receiving force of the diaphragm 15°17 decreases, the disk 29 and the rod 24 are separated by the spring 30, but the receiving force of the diaphragm 15 is
7, the disk 29 remains pressed upward and the switch 25 is still open. When the pressure further decreases to a pressure PON where the elasticity of the spring 300 and the pressure received by the diaphragm 15 are balanced, the pump 4 returns to the state shown in FIG. 5 and starts again.

The operating cycle Tc when the pump 4 performs automatic operation while repeatedly starting and stopping is given by the sum of the operating time Tom and the stopped time TOFF, and is expressed as the following equation. .

T c ” TON +TOFF The operating time TON 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. Time TOF
F is the time during which water is being discharged from the pressure tank 6 to the faucet 5. These times TON and TOFF become longer as the pressure tank 6 becomes thicker. In order to maintain a long electrical life of the electrical system of the pump 4 and the control switch 6, it is necessary to keep the operating cycle longer than a certain period of time, and therefore the pressure tank 6 also needs to have a corresponding size. For this reason, the size of the pressure tank 6 is usually very large, making it expensive and requiring a large installation area.

In the present invention, the flow rate flowing into the pressure tank 6-\ through the notch groove 20 of the opening valve 21 during the operating time TON is limited, and therefore the operating time TON can be extended. The operating cycle Tc 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 valve 21 is open during the stop time TOFF of the pump 4 and does not restrict the water discharged from the pressure tank 6, so there is no pressure drop in the faucet 5 or a decrease in the amount of water supplied at this time. , capable of proper automatic driving. Yet another valve 2
1 is closed and water is flowing in through the notch groove 20, the notch groove 20 acts as a resistance, so the pressure in the pressure chamber 22 is reduced to within the pump side connection port 8 and the faucet side connection port 10. Diaphragm 1 is kept lower than the pressure caused by pump 4.
5 can be stably maintained in the ON 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 notched groove 20 provided in the valve 21.
A similar effect can be achieved by holes or other means that exhibit a contracting effect when 1 is closed.

〔Effect of the invention〕

As described above, the present invention provides a fluid control device such as a pump that includes at least one pressure-responsive body that responds to pressure, and a switch whose contacts open and close depending on the pressure-responsive body, which is integrated with the pressure-responsive body. The advantage of being able to provide a fluid control device that can restrict the flow at the inlet of a pressure tank by the simple means of adding a valve that operates on the pressure tank is significant.

[Brief explanation of the drawing]

Fig. 1 is a diagram of a pump system applying a control switch according to an embodiment of the fluid control device according to the present invention, Fig. 2 is a longitudinal sectional view showing the embodiment of the present invention, and Fig. 3 is a resistance characteristic diagram of a resistance valve body. , FIG. 4 is an explanatory diagram of the set pressure and flow rate, and FIGS. 5 to 8 are explanatory diagrams of the operation of the embodiment of FIG. 2. DESCRIPTION OF SYMBOLS 1... Control switch, 4... Pump, 5... Faucet, 6... Pressure tank, 10... Water passage, 11...
Resistance valve body, 1"r, 20...notch groove, 15.17...
・Diaphragm, 21...valve, 26...switch. Figure l Figure 2 Part 3 Part 4 Day QOFF Q 5th Part 6Z 7th part 0 Part 8 Bacteria

Claims (1)

[Claims] 1. In a fluid control device such as a pump having at least one pressure-responsive body that responds to pressure, and a switch that opens and closes a contact on the pressure-responsive body, the switch operates together with the pressure-responsive body and the switch closes. What is claimed is: 1. A fluid control device comprising: a valve for controlling the flow rate of fluid at the inlet of a pressure tank;