JPH08147046A - Constant pressure control valve - Google Patents

Abstract

PURPOSE: To eliminate high-pressure water feeding after a pump stops and make a reed switch securely operate according to the motion of a main valve body by providing the main valve body with a valve mouth restriction member and a magnet, and providing the reed switch which operates closely to the magnet at the nearby position where the main valve body closes the valve mouth. CONSTITUTION: At an end part of a piston chamber 54, a pressure adjusting device 68 is provided while linked with the piston chamber 54, and adjusted water is discharged from a hole 69 to the primary side of the pump. The main valve body 59 is provided with a valve mouth restriction member 89 which restricts the flow rate at the valve mouth by the main valve body 59 in a specific small-opening-extent area, and the ring-shaped magnet 94 is mounted on a side part and fixed integrally with a valve rod 60. A switch holding plug 95 is mounted in the screw hole of the main body at the side part of the main body 50 corresponding to the main valve body 59, and the reed switch 96 is mounted on its end part. The reed switch 96 is so arranged as to turn ON and OFF with the magnetic force of the magnet 94 at the nearby position where the main valve body 59 is closed abutting against a valve seat 87, and connected to the control part of the pump by a cable 97.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant pressure control valve for controlling the pressure of a piping system used in a pump water supply unit in building equipment or the like.

[0002]

2. Description of the Related Art Conventionally, a control valve as shown in FIG. 5 disclosed in Japanese Patent Publication No. 57-35483 is known.
In the operation of the control valve 14, first, the pump 10 is stopped, the pressure tank 16 holds pressurized water, and the secondary piping systems 24 and 28 are maintained in a high pressure state. From this state, if the tap 30 of the piping system is opened and water is used,
Water in the tank is pushed out by the air pressure in the pressure tank 16. Further, when water is used from the faucet 30, the pressure in the tank is reduced and the pressures in the piping systems 24 and 28 are reduced to the operation set value of the pressure switch 18, so that the pressure switch 18 moves to the motor 1.
2. Operate the pump 10.

The water discharged by the activation of the pump 10 enters the control valve 14 through the suction channel 40.
Some of the water flows through the orifice 80 of the piston 72 into the lower chamber 84 of the piston. The water in the lower chamber 84 makes the magnitude of pilot pressure applied to the lower surface side of the piston 72 constant by the pressure regulator 38. When the above-mentioned pilot pressure applied to the lower surface side of the piston 72 exceeds the pressure of the piping system generated in the upper chamber 90, the valve member 36 moves upward and the throttle valve 74 is opened to open the piping through the outlet water passage 46. Water flows through the system. In this way the upper chamber 9
The opening of the throttle valve is determined by the pressure difference between 0 and the lower chamber 84, and the pressure in the secondary side piping system is controlled to be constant.

When the faucet 30 is closed and water is no longer used, the pressure in the piping system rises until it becomes higher than the pilot pressure applied to the piston 72, and the valve member 36 moves downward. The pressure in the upper chamber 90 is the throttle valve 74.
Is gradually increased until it is completely closed, and when the throttle valve 74 is closed, the water on the primary side then pushes up the check valve 98 through the passage 106 and flows into the pressure tank 16. When the pressure tank 16 is filled and the pressure in the piping systems 24 and 28 reaches the cutoff pressure of the pressure switch, the pressure switch 18 operates and the motor 12 and the pump 10 are stopped. The check valve 98 then contacts the valve seat 100 to prevent water from flowing back from the upper chamber 90 to the central chamber 82. When the use of water is stopped in this way, the pressure in the secondary piping system rises up to the cutoff pressure of the pressure switch.

As another conventional technique, there is a check valve with a flow switch disclosed in Japanese Utility Model Publication No. 3-19649 shown in FIG. This is a so-called in-line check valve 1
The magnet 23 is fixed to the lower portion of the valve body 17, and the reed switch 27 is inserted from the lateral direction of the valve body at a position opposite to the magnet 23, and is used in the pressure tank type water supply unit. Similarly to the above, when the amount of water used decreases, the valve body 17 is pushed by the spring 19 and gradually descends in the closing direction, and the amount of water used further decreases and the flow rate control unit 20
When the amount of water set in accordance with the diameter of the magnet and the set distance between the magnet 23 and the reed switch 27 reach the set distance, the reed switch 27 is actuated, the pump 35 is stopped by this signal, and the valve body 17 is seated on the valve seat 12. The valve port 11 is closed to prevent backflow from the secondary side.

[0006]

The former prior art of the above is to control the water supply pressure in the secondary side pipe flowing from the pump to the piping system to a constant level, but the pump 10 is stopped when the piping system is stopped. The pressure tank 16 inside is not stopped until water is pressurized to the pump stop pressure. Therefore, the water supply pressure from the faucet which is first used after the pump is stopped becomes considerably higher than the water supply pressure in the use condition where the pressure is normally controlled, which causes various problems for the user. To solve this, the pump cutoff set pressure of the pressure switch may be brought close to the pump start set pressure to reduce the differential pressure. However, if it is made extremely small, the chattering phenomenon that the pump repeatedly starts and stops easily occurs. In addition, there is a fluctuation in the set pressure due to the performance of the pressure switch, and there is a risk that the switch will not work because it will not be activated or cut off. For this reason, when the amount of water used becomes small, the pressure tank 16 is made to hold water to obtain a set pressure difference between start and shutoff of the pump. Therefore, in the former conventional technique, water having a water supply pressure used after the pump is stopped is higher than the water supply pressure normally used.

In the latter prior art of the above, when the valve body 17 of the check valve 1 is closed, the pump is stopped by the signal from the magnet 23 fixed to the lower portion of the valve body and the reed switch 27 fixed to the lower portion thereof. However, unlike the former conventional technology, the secondary side piping system cannot be controlled at a constant pressure, and the water supply pressure is high when the amount of water used from the faucet is small in proportion to the performance of the pump, and the water supply pressure is large when the amount of water used is large. It will decrease. Further, since the reed switch 27 is provided in the center of the inflow port so as to traverse the inflow port 2 of the check valve, the structure of the reed switch enclosing pipe 26 itself that withstands the pressure of fluid and the enclosing pipe that withstands the fluid pressure. Therefore, the pressure loss of the fluid flowing in the check valve 1 becomes large, and a high output pump must be used in consideration of the pressure loss in the check valve.

Further, the magnet 23 and the reed switch 27
Is provided so as to be activated when it linearly approaches in conjunction with the movement of the valve body 17, so that the range of set distance between the magnet and the reed switch due to the lines of magnetic force is narrow and a malfunction is likely to occur. When the magnet and the reed switch are too close to each other, the reed switch operates while the valve body 17 is open from the switch operation setting position, or conversely, when the reed switch is too far away, the valve body 17 is closed. Without the switch does not work. Further, there is a problem that the reed switch causes chattering due to pulsation of the pump and a water hammer in the piping system, which causes the pump to start and stop. INDUSTRIAL APPLICABILITY The present invention eliminates the problem of high-pressure water supply used after stopping a conventional pump by using it in a pump unit of a water supply device, and reliably operates a reed switch according to the movement of a main valve body to constantly control a piping system at a constant pressure. The present invention provides a constant pressure control valve.

[0009]

SUMMARY OF THE INVENTION The gist of the present invention is a valve connected to the discharge side of a pump to control the pressure of a fluid at a constant level. The valve has a suction channel and a discharge channel and the inside is the primary side. A valve body provided with a valve port that divides the pressure chamber and the secondary pressure chamber, a main valve body that is housed in the valve body to open and close the valve port to constantly control the pressure of the outlet water channel,
A constant pressure control valve comprising a balanced piston housed in a piston chamber via a valve rod connected to the main valve body on the side opposite to the main valve body, and a pressure adjusting device for adjusting the pressure in the piston chamber to a constant pressure. A valve opening regulating member that is inserted into the valve opening on the body side to restrict the flow rate of the main valve body flowing through the valve opening in a region of a predetermined small opening so that a small amount of water flows; A magnet provided on the valve body, and a reed switch provided on a side portion of the valve body and operated by approaching the magnet at a position near the main valve body closing the valve opening;
Is a constant pressure control valve. In the above, the operation of the pump is stopped by the operation of the reed switch.

[0010]

Since the present invention has the above-described structure, in the pump water supply system as described above, the water discharged from the pump enters the control valve, and a part of the water flows into the piston chamber of the piston, so that the pressure adjusting device is provided. Keeps the amount of pressure applied to the pressure regulating side of the piston constant. When this pilot pressure exceeds the piping system pressure generated in the main valve body, the main valve body moves to the outlet side, and the secondary side pressure is increased with the valve mouth regulating member of the main valve body further away from the valve mouth. The opening between the main valve body and the valve opening is determined by the pressure difference between the chamber and the piston chamber, and the pressure in the secondary side piping system is controlled to be constant.

When the water is no longer used, the pressure in the piping system rises until it becomes higher than the pilot pressure applied to the piston in the piston chamber, so that the main valve body moves to the side that closes the valve port and the main valve body closes. When the valve opening restricting member of the valve body approaches the valve opening and the pressure of the secondary side piping system gradually approaches the pilot pressure, the valve opening restricting member of the main valve body enters the valve opening. Until the main valve closes the valve opening, a small amount of water flows out from the primary side to the secondary side piping between the valve opening and the valve opening regulating member, and eventually the pressure in the secondary side piping becomes the pilot pressure. Larger than
The main valve body comes into contact with the valve seat of the valve opening to completely close the valve opening.
At this time, the magnet provided on the side portion of the main valve body comes close to the reed switch provided on the side portion of the valve body to operate the reed switch, and the pump is stopped by the signal of the reed switch.

In this way, since the pressure in the secondary side piping system is controlled to be constant and the pump is controlled,
There is no problem that the pump is stopped in the pressure state of the secondary side piping system which is almost the same as the constant pressure control pressure of the valve, and the secondary side piping system rises to high pressure and retains high pressure water until the conventional pump is stopped. In addition, the operating time of the pump is reduced by that much, and there is no waste of power or pressure adjustment water.

Further, since the main valve body is provided with the valve opening regulating member which is inserted into the valve opening by a predetermined amount, the flow rate of the main valve body passing through the valve opening is regulated in a predetermined small opening area, so that the main valve body is regulated. Does not suddenly close, and the moving distance of the main valve body in a small flow rate range where the amount of water used is small becomes long and the moving speed of the main valve body when the main valve body closes the valve opening becomes slow. Therefore, the magnet provided on the main valve body can reliably cross the operation range width of the reed switch provided on the side portion of the main body, and the reed switch can be reliably operated.

Since the reed switch is provided on the side of the main body and does not traverse the flow path as in the conventional case, there is no pressure loss of fluid. Furthermore, since the approaching movement relationship between the magnet and the reed switch is performed by so-called parallel movement in a close state, it is easier to cross the sensing width of the reed switch as compared with the prior art in which the magnet and the reed switch are linearly approached. Moreover, since the magnetic field lines are easily received, the reed switch can be operated more reliably.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a constant pressure control valve of one embodiment showing a main valve body in a closed state and an open state, and FIG. 2 is a sectional view showing a main part of another embodiment. In FIG. 1, an inlet water channel 51 that connects directly above the pump is provided in the lower portion, a central chamber 52, an outlet channel 53 on the left side, and a piston chamber 5 on the right side.
4 is provided on a coaxial line by mounting a case 55 in the main body 50. The case 55 has a central opening 56 communicating with the central chamber 52, and left and right collars 57 and 58 seal the inner surface of the main body to separate the central chamber 52 and the outlet channel 53.
The case 55 is equipped with a control valve body 62 that connects a main valve body 59, a valve rod 60 and a piston 61.

At the end of the piston chamber 54, the piston chamber 54
In communication with the valve 63, diaphragm 64, spring 6
5. A pressure adjusting device 68 including adjusting bolts and nuts 66 and 67 is provided, and the adjusted water is discharged from the hole 69 to the primary side of the pump. The piston 61 is provided with a small hole 80 through which a wire 77 is passed. A part of the water sent to the central chamber 52 flows into the piston chamber 54, and the pressure adjusting device 68 adjusts the pressure in the piston chamber 54 to a predetermined pressure. maintain. Reference numeral 85 is a valve rod receiving portion that supports the valve rod 60 integrated with the case 55. The left end of the case 55 serves as a valve opening 86, and a valve seat 87 is provided to contact and seal the main valve body 59.

In the main valve body 59, a valve seat 93 that seals the valve seat 87 and a valve opening regulation for the main valve body to be inserted into a valve opening 86 for regulating the flow rate of the valve opening in a predetermined small opening area. Member 8
9 is provided, and a ring-shaped magnet 94 is attached to the side portion to integrally fix the valve rod 60. The outer diameter of the valve opening restricting member 89 is slightly smaller than the inner diameter of the valve opening 86 so that a small amount of water flows from the central chamber 52 to the outlet water channel 53 side. There is. Incidentally, as shown in FIG. 2, an appropriate flow groove 78 may be provided between the valve opening restricting member 89 and the valve opening 86, and as shown in FIG. A small amount of water may flow from the circulation hole 79.

A switch holding plug 95 is attached to a screw hole of the main body 50 on a side portion of the main body 50 corresponding to the main valve body 59, and a reed switch 96 is attached to an end portion of the switch holding plug 95. The reed switch 96 is located near the main valve body 59 in contact with the valve seat 87 and is closed.
It is arranged so that it can be turned on and off by the magnetic force of. 9
A reed switch cable 7 is connected to the control unit of the pump.

In FIG. 4, the main body 50 'is made of a non-magnetic material such as resin, stainless steel, copper alloy, etc.
An embodiment in which the reed switch 96 'is provided on the outer peripheral surface of 0'is shown. In this case, since the main body 50 'is a non-magnetic body, the main valve body 5 is
The magnetic lines of force of the magnet 94 provided on the magnet 9 pass through the side wall of the main body and act on the reed switch 96 on the outer peripheral surface of the main body, so that the main valve body 5
The reed switch 96 'is activated by the movement of 9. In this embodiment, since the reed switch 96 'is fixed to the outside of the main body, it is easy to perform maintenance such as adjusting or replacing the reed switch.

The water discharged from the pump enters the central chamber 52 in the control valve, acts on the main valve element 59 and the piston 61, and part of the water is in the piston chamber 54 of the piston 61.
And the magnitude of the pressure applied to the lower surface side of the piston 61 is made constant by the pressure adjusting device 68. When this pilot pressure exceeds the piping system pressure on the main valve body 59 on the side of the outlet channel 53, the valve opening regulating member 89 slides along with the main valve element 59 on the side of the outlet channel, and the valve 86 opens. The mouth restriction member 89 separates, and the valve opening restriction member 89 and the valve seat 8 are caused by the pressure difference between the discharge water channel 53 and the piston chamber 54.
The opening degree between No. 7 and No. 7 is determined, and the pressure on the outlet water channel 53 side is controlled to be constant.

When the faucet of the piping system is closed and water is no longer used, the pressure on the outlet water channel 53 side rises until it becomes larger than the pilot pressure applied to the piston 61 of the piston chamber 54, so that the main valve body 59. Moves toward the side that closes the valve opening 86, the pressure on the outlet water channel 53 side gradually approaches the pilot pressure in the piston chamber 54, and the valve opening regulating member 89 enters the valve opening 86. Then, until the main valve body 59 closes the valve opening 86, the communication groove 7 of the valve opening regulating member 89 is closed.
The water on the inlet water channel 51 side flows out to the outlet water channel 53 side from 8 and the like, and eventually the valve seat 93 of the main valve body 59 comes into contact with the valve seat 87 of the valve port to completely close the valve port 86. At the time of closing, the magnet 94 provided on the side portion of the main valve body 59 approaches the reed switch 96 fixed to the main body 50, the reed switch 96 is activated by the magnetic force of the magnet, and the pump is stopped by this signal. In this way, constant pressure control and pump control are performed.

[0022]

As described above, since the pressure in the secondary side piping system of the outlet channel is controlled to a constant pressure and the pump is stopped by the movement of the main valve body, it is almost equal to the constant pressure control pressure of the valve. The problem was solved that the pump was stopped under the same pressure condition in the secondary side piping system, and high pressure water came out from the faucet after the conventional pump was stopped. In addition, the operating time of the pump is reduced by that much, and there is no waste of electric power or water for pressure adjustment.
Further, since the moving distance when the main valve body closes the valve opening becomes longer and the moving speed becomes slower, the magnetic force of the magnet provided in the main valve body reliably operates the reed switch. Further, the chattering phenomenon that the reed switch is repeatedly turned on and off does not occur. Further, since the reed switch is provided on the side of the main body and the reed switch does not cross the flow path, it does not obstruct the flow path, and pressure loss due to the reed switch does not occur. Further, since the approaching movement of the magnet and the reed switch is performed by the parallel movement in the so-called close state, the reed switch operates reliably.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main valve body in a closed and open state showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of an essential part showing another embodiment.

FIG. 3 is an enlarged cross-sectional view of an essential part showing another embodiment.

FIG. 4 is an enlarged sectional view of an essential part showing still another embodiment.

FIG. 5 is a diagram of a pump water supply system using a conventional constant pressure control valve.

FIG. 6 is a sectional view of a check valve with a flow switch showing another conventional technique.

[Explanation of symbols]

50 Control valve body 51 Inlet channel 5
2 Central chamber 53 Outlet channel 54 Piston chamber 5
5 Case 56 Center opening 57, 58 Collar 5
9 Main valve body 60 Valve rod 61 Piston 6
2 Control valve body 63 Valve 64 Diaphragm 6
5 Spring 66 Adjustment bolt 67 Adjustment nut 6
8 Pressure regulator 69 Discharge hole 77 Wire 7
8 Distribution Groove 79 Distribution Hole 85 Valve Rod Receiving Section 8
6 valve opening 87 valve seat 89 valve opening regulating member 9
3 Valve seat 94 Magnet 95 Switch holding plug 9
6 reed switch 97 cable

Claims (1)

[Claims] 1. A valve which is connected to a discharge side of a pump and controls a fluid pressure to be constant, and which has a suction water channel and a discharge water channel and divides the inside into a primary pressure chamber and a secondary pressure chamber. A valve body provided with a valve opening, a main valve body that is housed in the valve body to open and close the valve opening to control the pressure of the outlet water channel constantly, and the main valve body is connected to the opposite side of the main valve body. In a constant pressure control valve consisting of a balanced piston housed in a piston chamber via a valve rod and a pressure adjusting device for adjusting the piston chamber to a constant pressure, on the valve opening side of the main valve body, inserted into the valve opening. A valve opening restricting member that restricts a flow rate of the main valve body that flows through the valve opening in a region of a predetermined small opening so that a small amount of water flows, a magnet provided on the main valve body, and a side of the valve body. Installed at the position where the main valve body closes the valve opening. A constant pressure control valve, comprising: a reed switch that operates when approaching the net.