JPS586845B2 - fluid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention transfers fluid using a pressure feeder such as a pump, detects the circuit internal pressure and circuit flow rate that change in response to the opening/closing operation of a circuit opening/closing valve provided in a fluid supply circuit, and This relates to a remote automatic control means for a fluid supply device that starts and stops the fluid supply system, and detects the displacement of the pressure detection mechanism and flow rate detection mechanism with one electric switch, simplifying the configuration and making adjustment easier. The purpose of this is to improve the durability of.

BACKGROUND ART Conventionally, in a hot water heating device or the like as an example of a fluid supply device, remote control from a terminal device has been handled by performing electrical signal wiring between each terminal device and a pressure feeder such as a hot water circulation pump.

This method required on-site construction, which was laborious and expensive.

Recently, a circuit opening/closing valve has been installed on the terminal, and a pressure detection mechanism and a flow rate detection mechanism have been installed on the pressure feeder side to detect the circuit internal pressure and circuit flow rate that change in response to the opening/closing operation of the circuit opening/closing valve. Some devices have also appeared that realize remote automatic control by detecting descent and starting the pressure feeder, and detecting a decrease in circuit flow rate and stopping the pressure feeder.

However, in this method, an electric switch was installed in the pressure detection mechanism section and the flow rate detection mechanism section to detect pressure and flow rate, so two electric switches were required, making the configuration complex and increasing the cost. was.

In addition, since the displacement of the pressure detection mechanism and flow rate detection mechanism cannot be taken too much, it is troublesome to adjust the switch so that it falls within the operating range of the electric switch. It took.

Furthermore, the electric switch of the pressure detection mechanism section and the electric switch of the flow rate detection mechanism are installed in parallel in the electrical circuit, and during normal operation, the electric switch of the pressure mechanism section and the electric switch of the flow rate detection mechanism section are both turned on. However, when the number of terminal units in use is reduced and the internal pressure in the circuit increases, the electric switch of the pressure detection mechanism turns off, and the pressure feeder continues to operate using only the electric switch of the flow rate detection mechanism. Machine operation is maintained.

For this reason, if the number of terminals used is changed frequently, the electric switch of the pressure detection mechanism will turn on and off frequently, leading to the end of the life of this electric switch and resulting in durability problems. It had

The present invention provides a completely new system that improves all of these drawbacks, and a detailed explanation thereof will be given below.

In order to explain the overall control configuration of the present invention, FIG. 1 shows an example of a system configuration using a hot water heating device as a fluid supply device.

Heat source device 1, each terminal device 2a, 2b, 2c, and header 3
and a circulation pump 4, which is a pressure feeding device for transferring fluid, are connected by piping, and each terminal device 2a, 2 at the end of the piping
Opening/closing valves 6 and the like are provided in each of b and 2c to form a hot water circulation circuit.

A control unit 6 with a check valve is connected to the circulation pump 4 in the vicinity of the circulation pump 4, which integrates a check valve, a flow rate detection mechanism for detecting fluid flow rate fluctuations, and a pressure detection mechanism for detecting pipe internal pressure.

7 is a water tank for replenishing circulating water and absorbing thermal expansion.

Next, an embodiment of a control unit with a check valve, which is a main component of the present invention, will be described with reference to the drawings.

In FIG. 2 a valve body 1 with a fluid inlet 8 and an outlet 9
A valve body 12 is provided within the valve body 12, which is displaced according to the flow rate when the fluid is flowing, and is in close contact with the valve seat 11 when the fluid stops flowing to prevent backflow.

This valve body 12 is biased toward the valve seat by a spring 13 to ensure the backflow prevention function and to limit the amount of displacement of the valve body at the time of a large flow rate.

In addition, a valve stem 14 is fixed to the valve body 12, and this valve stem 14 faces the outside through a sealing means provided in the upper pressure detection mechanism section, and the circulation pump 4 and a micro switch 15, which is an electric switch that controls the heat source device 1, is provided so that one end thereof can directly come into contact with the micro switch 15.

The pressure detection mechanism section is divided into two chambers by a bellow frame 16 which is a flexible membrane body, and the high pressure chamber 17 has a valve body 1.
2 is introduced into the circuit, and the pressure on the suction side of the circulation pump 4 is introduced into the low pressure chamber 18 through the pressure introduction port 19, so that the bellow flamm 16 is displaced according to the pressure difference between the compartments.

As a means for extracting the displacement of the bellow flamm 16 to the outside, a hollow shaft 20 through which the valve stem 14 passes is provided in the bellow flamm 16. A microswitch 15, which is an electric switch similar to the valve stem 14,
One end thereof is provided so as to be able to come into contact with it.

Microswitch 15 results in valve stem 14 and shaft 20
Due to the displacement of , the pressure is released or the pressure is released, and the opening and closing occurs.

Further, the bellow flamm 16 is urged upward by a spring 21, and is configured to be able to be displaced upward when the differential pressure is small.

Next, the operation of this control unit 5 with a check valve will be explained in conjunction with the operation of the hot water heating device.

First, the on-off valve 6 of this hot water heating device is closed, and all the on-off valves provided on other terminals are also closed, and there is no pressure between these on-off valves and the control unit 6 with a backflow prevention valve. Assume that water is retained at a high temperature.

This state corresponds to state 1 in the graph of FIG. 3 showing the relationship between the device operating state and displacement.

Next, when heating is required and the on-off valve 6 is opened,
The pressure that has been maintained between the on-off valve 6 and the control unit 5 with a check valve escapes to the lower pressure path downstream of the on-off valve.

Accordingly, the high pressure chamber 17 of the control unit 5 with a check valve
As the side pressure becomes lower and the differential pressure becomes smaller, the bellow flamm 16 is pushed upward by the spring 21, and the shaft 20 gradually approaches the microswitch 15, and is finally displaced to the position shown in Fig. 3, where the microswitch Turn on 15.

When this microswitch is turned on, the circulation pump 4 and the heat source device 1 start operating.

Therefore, the discharge pressure of the circulation pump 4 is applied to the high pressure chamber 17, and the suction pressure is applied to the low pressure chamber 18. In this case, since only one terminal is used, the differential pressure becomes large, so the bellow flamm 16 is moved downward. It is displaced and becomes below the off point of the microswitch 15.

However, as is clear from FIG. 3, before the shaft 20 of the bellows ram descends and becomes below the off point of the micro switch, the flow of circulating water pushes up the valve body 12 and the valve stem 14 pushes the micro switch. Since it is in the on state,
As a result, the circulation pump 4 and the heat source device 1 continue to operate.

Next, in order to stop the operation of this heating device which was in the operating state (2), the opening/closing valve 6 of the terminal device is opened.

As the circulating flow rate decreases, the valve body 12 begins to move downward, and when the flow rate becomes minute and becomes below the off-point of the microswitch, the shaft of the pressure detection mechanism has already become below the off-point, so the circulation flow is reduced. The power supply to the pump 4 and the heat source device 1 is cut off, and the operation of these devices is stopped.

As a result, the pressure on the inlet side 8 of the valve body 12 drops rapidly, so the valve body receives back pressure and suddenly comes into contact with the valve seat 11.
The discharge pressure before the circulation pump is stopped is maintained between it and the on-off valve 6 which is already in a closed state.

In the above operation explanation, in order to make the explanation easier to understand, the explanation was based on the opening/closing operation of one on-off valve, but the point is that when any one of the plurality of on-off valves is opened, the circulation pump 4 or The heat source device 1 starts operating, continues operating while any one is open, and stops operating when the last one is closed.

Although the above embodiment uses a hot water heating device as a fluid supply device and is equipped with a control unit with a backflow prevention valve, the idea of the present invention can also be applied to a fluid supply device such as a well pump. .

In addition, internal pressure detection is a differential pressure detection type in order to prevent the circulation pump's discharge pressure from fluctuating due to fluctuations in the mounting height of the water tank, making it impossible to perform pressure detection correctly.However, if there is no such risk, In the embodiment, it is also possible to replace the circulation pump suction side pressure with atmospheric pressure and use a gauge pressure detection type.

Alternatively, a check valve may be provided separately and the flow rate may be detected by detecting the differential pressure across the resistor as a displacement using a diaphragm or the like.

In addition, the present invention includes a valve stem 14 and a shaft 20' as shown in FIG.
The displacement of the flow rate detection mechanism section and the pressure detection mechanism section taken out separately in step 2 may be replaced with the displacement of the arm 22 that is displaced in conjunction with these operations, and the microswitch 15 may be opened and closed.

Further, the check valve may be provided independently, either on the discharge side or on the suction side of the circulation pump.

In the example, it is installed on the discharge side, but if it is installed on the suction side, the pressure maintained between the check valve and the opening/closing valve when the circulation pump is stopped will be slightly lower than when it is installed on the discharge side. However, remote control operation is possible.

Further, an on-off valve may be provided on the terminal side of the suction side piping of the circulation pump.

In this case, contrary to the embodiment, a low pressure is maintained between the on-off valve and the check valve.

As described above, the present invention extracts the internal pressure fluctuations and flow rate fluctuations in the circuit according to the opening and closing operations of the opening/closing valve provided in the terminal device to the outside as the displacement of the shaft or valve stem, and uses these displacements to Press or release the electric switch,
By opening and closing this, it is possible to remotely start and stop circulation pumps, heat source equipment, etc. from the terminal side, and has the following effects.

(1) Since the displacement of the pressure detection mechanism and the flow rate detection mechanism can be detected with one electric switch, the configuration is simple and can be provided at low cost.

(2) The adjustment work required to make the operating range of the electric switch fall within the displacement width of the pressure detection mechanism and flow rate detection mechanism can be halved compared to the conventional method.

(3) Since the electrical switch does not turn on and off as the number of terminals increases or decreases, the life of the electrical switch is dramatically improved.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of a hot water heating device according to an embodiment of the present invention, Fig. 2 is a sectional view of a control unit with a check valve,
FIG. 3 is a graph showing the relationship between the operating state and displacement of the control unit with a check valve, and FIG. 4 is a sectional view showing another embodiment of the control unit with check valve of the present invention. 4...Circulation pump (pressure feeder), 5...
Control unit with backflow prevention valve, 6... Opening/closing valve, 12... Valve body (also serves as backflow prevention valve), 14...
... Valve stem, 15 ... Micro switch (electric switch), 16 ... Bellow frame (flexible membrane body), 20, 20' ... Shaft.

Claims (1)

[Claims] 1. To prevent backflow of fluid into the piping near the pressure feeder of the fluid supply circuit, which has a pressure feeder that transfers fluid, piping connected to this pressure feeder, and an on-off valve installed separately from the pressure feeder at the end of the piping. A check valve that prevents backflow, a flow rate detection mechanism that detects fluid flow rate fluctuations, and a pressure detection mechanism that detects the internal pressure of the piping between the check valve and the opening/closing valve are provided. A pressure detection mechanism detects the fluctuation and starts the pressure feeder, a flow rate detection mechanism detects a decrease in flow rate due to the closing operation and stops the pressure feeder, and the flow rate detection mechanism is displaced according to the fluid flow. It consists of a valve body and a valve stem attached to this valve body, and the valve stem is exposed to the outside through a sealing means such as an OIJ ring, and a bellow flamm etc. that displaces the pressure detection mechanism in response to internal pressure fluctuations. a flexible membrane body;
It consists of a shaft provided on this flexible membrane body, the shaft is exposed to the outside through a sealing means such as an O-ring, and the valve is opened and closed by being pressed or released by displacement of the valve stem and shaft. One electric switch is provided, and the electric switch activates the pressure feeder, etc. by detecting the fluctuation in pressure between the opening/closing valve and the check valve with a pressure detection mechanism corresponding to the opening operation of the opening/closing valve, and starting the pressure feeding machine. A fluid supply device that uses a flow rate detection mechanism to detect the stoppage of fluid flow in piping in response to a closing operation, and then stops and controls the pressure feeder.