JPH04312275A - Ball tap - Google Patents

Abstract

PURPOSE:To add a constant flow rate function and to prevent a hunting phenomenon by providing a throttle between a main valve and a constant flow rate valve body, and forming the rate diameter of a constant flow rate valve seat and the pressure receiving face of a diaphragm at the same diameter, in a pilot type ball tap using a diaphragm. CONSTITUTION:When the water level of a water storage layer 28 is lowered and a float 15 is moved lower, a pilot valve body 13 is lowered by a rod 14 and separated from a valve seat 12, a pilot valve c is opened, and the water in a back pressure chamber 6 is exhausted. As a result, a diaphragm is pushed up by the primary water feeding pressure P1, a main valve a is opened, and the water is fed from an inflow port 19 into the water storage layer 28 through an outflow port 20. In this case, the pressure is lowered by a throttle 16, and a differential pressure is generated between the primary water feeding pressure P1. And in this case, since the seat diameter of a constant flow rate valve seat 8 and the diameter of the pressure receiving face of the diaphragm are equal, only the differential pressure operates as a lifting force of the diaphragm. Consequently, the positions of the main valve body 4 and a constant flow rate valve body 10 are determined by only the relation of the differential pressure and the force of a spring 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball tap.

0002

[Prior Art] In general, in a ball tap, the higher the primary water supply pressure, the higher the instantaneous flow rate and the louder the water supply noise.In addition, a squeezing sound is generated when the water is about to stop, so it is necessary to install a separate noise-reducing bush. It becomes necessary. In addition, the higher the primary water supply pressure, the greater the buoyancy required for water stoppage, and the higher the water stoppage in the water storage tank, making it necessary to adjust the waterstop level on site. Therefore, the inventors of the present invention developed a ball tap having a constant flow function in order to solve the above problem.

This ball tap has the structure shown in FIG.
, a main valve body 4 consisting of a diaphragm that constitutes the main valve a corresponding to the valve seat 3 from the primary side, and a main valve a1 defined behind by the main valve body 4 via a small passage 5. A back pressure chamber 6 that communicates with the next side and a spring 7 that biases the main valve body 4 in the valve closing direction.
A constant flow valve seat 8 is disposed concentrically with the valve seat 3 on the secondary side of the main valve a and has a seat diameter that is the same as the diameter of the pressure receiving surface of the main valve body 4, and Constant flow valve b corresponding to seat 8
and a constant flow valve body 10 connected to the main valve body via a connecting rod 9, and a back pressure chamber 6 communicating with the secondary side of the main valve a by passing through the connecting rod 9 and the constant flow valve body 10. Pilot passage 1
1 and a pilot valve seat 12 provided in the pilot passage.
A pilot valve c is formed corresponding to the pilot valve seat 12 from the secondary side, and is connected to the float 15 via the rod 14, and is connected to the up and down movement of the float as the water level rises and falls. A pilot valve body 13 that opens and closes, and a throttle part 1 provided in the flow path 2 between the main valve a and the constant flow valve b.
6, and the primary water supply pressure P
The constant flow valve is activated by the balance between the differential pressure between 1 and the pressure P2 after passing through the throttle part and the force of the spring, and the primary water supply pressure P1 is
Even when the spring force is high, the flow rate is adjusted to a constant value commensurate with the spring force.

0004

[Problems to be Solved by the Invention] However, subsequent research by the inventors has revealed that the hunting phenomenon is likely to occur in ball taps having a constant flow function as described above. That is, in the above-mentioned ball tap, since the float rises as the water level rises, the pilot valve closes slowly. At this time, the primary water supply pressure P
1, the back pressure chamber pressure P1, and the back pressure chamber pressure P1' change slowly, so the main valve also closes slowly. In this case, when the primary water supply pressure P1 is high and the main valve moves in the closing direction, the constant flow valve moves in the opening direction and the secondary water supply pressure P3 rises, pushing the rod down, so the pilot valve opens again and the main valve closes. Moves in the valve opening direction. Then, the secondary water supply pressure P3 decreases, the float rises, the rod pushes up the pilot valve element, the pilot valve is closed, and the main valve is closed again. Repetition of such operations causes a hunting phenomenon.

The present invention has been made in view of the above-mentioned current situation, and its object is to provide a ball tap that has a constant flow function and is free from the possibility of hunting.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the ball tap of the present invention includes a pilot valve body of the ball tap having the above-mentioned structure having a constant flow function, which was previously developed by the present inventors, A rod that connects the valve body to the float is made of a separate member, and the rods are connected so as to be able to come into contact with and separate from each other in an abutting manner. A receiving pressure receiving part is integrally provided in the shape of an enlarged head, and a sealing part is provided to prevent the secondary water supply pressure P3 from going around to the pressure receiving lower surface side when the rod is in the lowered position.

[0007]

[Operation] In the ball tap constructed as described above, as the fluid passes through the constriction part, a pressure difference is created between the primary side water supply pressure P1 and the pressure P2 after passing through the constriction part. On the other hand, since the seat diameter of the constant flow valve seat and the pressure receiving surface diameter of the diaphragm are the same diameter, the position of the constant flow valve is simply determined by the primary side water supply pressure P1.
It is determined by the relationship between the pressure difference between P2 and the pressure P2 after passing through the throttle part, and the force of the spring that biases the constant flow valve element in the valve opening direction via the main valve and the connecting rod.

Therefore, when the primary pressure is high, the constant flow valve is throttled in accordance with the pressure, and the amount of water supplied is automatically adjusted to a substantially constant flow rate. Also, the buoyancy force F of the float increases as the water level rises.
is initially smaller than the secondary water supply pressure P3 applied to the upper surface of the pressure receiving part of the rod, and overcomes the secondary water supply pressure P3 applied to the upper surface of the pressure receiving part only when the water level rises considerably. Therefore, when this P3 is overcome, the float rises rapidly and quickly closes the pilot valve.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is the main body of the ball tap, 19 is its inlet, and 20 is its outlet, and these two ports 19 and 20 are connected by a flow path 2.

A main valve seat 3 and a constant flow valve seat 8 are formed in the flow path 2 with the former on the upstream side, and a constriction portion 16 is further formed between these valve seats 3 and 8. The main valve seat 3 is formed horizontally,
The main valve body 4 corresponds from the primary side.

The main valve body 4 is made of a diaphragm, and has a peripheral edge portion that is attached to an opening 21 formed in the main body 1 above the main valve seat 3, and a lid 22 that is attached to the opening 21, and a stepped portion 2 that is formed in the opening 21.
3 and is disposed horizontally above the main valve seat 3 to constitute the main valve a, and also forms a back pressure chamber 6 between the back surface of the main valve a and the ceiling surface of the lid 22.

This back pressure chamber 6 is connected to the main valve a1 via the small passage 5.
It communicates with the flow path 2 on the next side, and also communicates with the flow path 2 on the secondary side of the main valve a via the pilot valve c. Further, a spring 7 is installed in the back pressure chamber 6 between the main valve body 4 and the lid 22.
The main valve body 4 is urged in the valve closing direction.

The small passage 5 is formed to pass through the step 23 of the main body opening 21 and the lid 22, and has a valve chamber 25 in the middle thereof in which a ball valve 24 is accommodated. This valve chamber 25 has a seating portion for the ball valve 24 formed on its upper surface, and although not shown, this seating portion is formed so that a slight water passage gap remains even when the ball valve 24 is seated. There is.

The above-mentioned ball valve 24 has a specific gravity slightly larger than 1, and is normally sunk at the bottom of the valve chamber 25, but the valve chamber 24 of the small passage 5
When an upward flow occurs in 5, it flows upward and sits on the seating portion, keeping the water flow area of small passage 5 small. This makes it possible to widen the diameter of the small passage 5 to a size that prevents it from becoming clogged with dirt or the like. The pilot valve c will be described later.

On the other hand, the pre-regulated flow rate valve seat 8 is provided concentrically with the main valve seat 3 and has the same seat diameter as the pressure receiving surface of the diaphragm constituting the main valve body 4.
From the next side, a constant flow valve body 10 corresponds to constitute a constant flow valve b.

The constant flow valve body 10 has a seating surface side formed into a tapered surface that slopes upward toward the center thereof, and a connecting rod 9 that extends upward is integrally protruded from the center. It passes through the valve seat 8, the throttle part 16, and the main valve seat 3, extends to the primary side of the main valve a, and is connected and fixed to the central part of the main valve body 4.

A connecting rod 9 is passed through the constant flow valve body 10 in the axial direction to connect the back pressure chamber 6 to the flow path 2 on the downstream side of the constant flow valve b.
A pilot passage 11 communicating with the next side is formed. A pilot valve seat 12 is formed horizontally in the middle of the pilot passage 11, and a pilot valve body 13 corresponds to the valve seat 12 from its secondary side to form a pilot valve c.

The pilot valve body 13 is a poppet type valve body having a pointed head, and is disposed in the pilot passage 11 so as to be able to move up and down and back, and its rear end abuts against a rod 14 connected to a float 15 so as to be able to move toward and away from it. The pilot valve body 13 is provided with an axial groove on its circumferential surface, or has a triangular stepped surface to provide a water flow gap between it and the inner circumferential surface of the pilot passage 11.

The rod 14 has a vertical hole 26 formed concentrically with the main valve seat 3 at the bottom of the main body 1, and the upper part thereof is located on the secondary side of the flow path downstream of the constant flow valve b in the main body 1. The upper end surface is in contact with the lower surface of the pilot valve body 13, and the lower end is in contact with the main body 1.
It extends downward and attaches the float 15.

[0020] An enlarged head-shaped pressure receiving part 17 that receives secondary water supply pressure is integrally formed at the upper part of the rod 14 located inside the main body 1. The pressure receiving part 17 is formed sufficiently large to have a circular planar shape, and a seal part 18 is formed protruding from the lower peripheral edge of the pressure receiving part 17 to closely seal the flat part around the hole 26 through which the rod 16 is inserted. . This seal portion 18 is
A protrusion may be formed on the side.

The float 15 is formed in a cylindrical shape, and has a rod attachment hole 27 provided with a female thread at its axial center, and is screwed into a threaded portion 14a provided at the lower part of the rod 5. Therefore, the installation height of this float 15 can be adjusted. Therefore, such a ball tap is used by fixing it to the side wall of the water reservoir 28 and connecting the water supply pipe 29 to the inlet 19, and when the water level in the water reservoir 28 is at a predetermined full water position, the pilot valve body 13 is opened. The pilot valve c is closed by being pushed up by the rod 14, and the main valve a is also closed.

The water in the water storage layer 28 is now being used, and as the water level drops, the position of the float 15 will also drop accordingly.
The force of pushing up the pilot valve body 13 by the rod 14 is released, the pilot valve body 13 separates from the pilot valve seat 12, the pilot valve c opens, and the water in the back pressure chamber 6 is discharged.

As a result, the balance between the primary water supply pressure P1 and the back pressure indoor pressure P1' is disrupted, and the diaphragm is pushed up by the primary water supply pressure P1, opening the main valve a and opening the inlet 19.
The water flowing in flows to the outlet 20 and is discharged from the outlet 20 into the water reservoir 28 . At this time, the pressure of the water flowing through the flow path 2 passes through the constriction part 16, so that the downstream pressure P2 decreases, and a pressure difference is created between the primary water supply pressure P1 and the flowing water pressure P2 downstream of the constriction part 16. Occur.

Since the diameter of the pressure receiving surface of the diaphragm of the main valve a and the seat diameter of the constant flow valve seat 8 are the same diameter, the diaphragm 4 receives the above-mentioned forces P1 and P2 to lift it upward. The relationship between this force and the force of the spring 7 determines the position of the main valve body 4 and the position of the constant flow valve body 10 connected to it via the connecting rod 9. .

Therefore, as the primary water supply pressure P1 increases, the constant flow valve b is positioned upward, and the opening degree of the constant flow valve b is reduced, so that the secondary water supply pressure P3 is maintained substantially constant. still,
The valve opening area of the main valve a is significantly larger than the valve opening area of the constant flow valve b, and fluctuations in the position of the main valve body 4 have almost no effect on the opening degree of the main valve a.

On the other hand, the water level in the water reservoir 28 gradually recovers due to the water supply from the ball tap, and as a result, the float 1
Although the buoyant force F of 5 gradually increases, the pressure receiving part 17 of the rod 14
Since the secondary water supply pressure P3 is applied to the upper surface, the pressure receiving part 1
If the diameter of 7 is A, the rise of the float 15 is suppressed while F<P3×A, the rod 14 does not move, and the pilot valve c is fully open.

[0027] The water level in the water reservoir 28 rises, and F>P3 ×
A, the moment the float 15 rises slightly, that is, the rod 1
At the moment when the rod 4 moves upward slightly, the seal of the seal part 18 is lost and P3 goes around the lower surface of the pressure receiving part 17, so that the force that moves the rod 16 upward, that is, urges the pilot valve body 13 in the valve closing direction. The force is F=P, where the diameter of the rod 16 is B.
3×(A-B) is added, the float 15 rises rapidly, and the pilot valve c is suddenly closed.

Therefore, the main valve element 4 moves only in the closing direction regardless of the increase in secondary pressure when the main valve a is closed. Note that the main valve a closes due to the increase in the volume of the back pressure chamber 6 due to water flowing into the back pressure chamber 6 from the small passage 5, but the back pressure chamber 6 is closed due to the primary water supply pressure P.
1, the primary water supply pressure P1 becomes the water stoppage force of the main valve, and the higher the primary water supply pressure P1, the more reliable the water stoppage becomes.

[0029]

[Effects] Since the present invention is configured as described above, the following effects can be achieved. (1) Since it has a constant flow rate function, even when the primary water supply pressure is high, it is possible to limit the water supply to a predetermined amount and reduce the water supply noise and the squeezing sound when the water is about to stop, without installing a quieting bush, etc. It can achieve quieter operation.

(2) Since the main valve is a diaphragm valve as a pilot type, the water stopping power is less affected by the primary water supply pressure, and moreover, the primary water supply pressure is led to the back pressure chamber behind the diaphragm valve, so 1. The next water supply pressure acts as a water stop force, ensuring water stop.

(3) A rod for applying the buoyancy of the float to the pilot valve body is made a separate member from the pilot valve body so that both can be moved toward and away from each other, and a pressure receiving part is provided on the rod to receive secondary pressure and a seal is formed. Since the secondary pressure is prevented from going around to the lower surface of the pressure receiving surface when the float is in the lowered position, the upward movement of the float is suppressed by the secondary pressure, and when the buoyant force overcomes the secondary pressure, At this point (when the water level has risen considerably), the pilot valve can be suddenly closed by raising the water level rapidly. Therefore, hunting can be prevented by moving the main valve body only in the closing direction, regardless of the increase in secondary pressure just before the main valve closes.

(4) As described above, since the pilot valve is suddenly closed and the main valve body is moved only in the valve-closing direction after the water level has risen considerably, water discharge due to fluctuations in the liquid level can also be prevented. (5) Durability is improved because hunting is prevented and frequent opening and closing of the valve is eliminated.

[0033]

[Brief explanation of drawings]

FIG. 1 is a sectional view of a ball tap showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing the operating state of main parts.

FIG. 3 is a sectional view of a ball tap developed by the present inventors in the process of achieving the present invention.

[Explanation of symbols]

1: Main body
2: Flow path 3: Main valve seat
4: Main valve body 5: Small passage
6: Back pressure chamber 7: Spring
8: Constant flow valve seat 9: Connecting rod
10: Constant flow valve body 11: Pilot passage
12: Pilot valve seat 13: Pilot valve body
14: Rod 15: Float
16: Restricted part 17: Pressure receiving part 1
8: Seal part a: Main valve
b: Constant flow valve c: Pilot valve

Claims (1)

[Claims] Claim 1: A main valve seat provided in the middle of a flow path inside the main body, a main valve body consisting of a diaphragm that corresponds to the valve seat from the primary side and constitutes the main valve, and a main valve body. A back pressure chamber is defined behind it and communicates with the primary side of the main valve via a small passage, a spring biases the main valve body in the valve closing direction, and a back pressure chamber is provided on the secondary side of the main valve concentrically with the valve seat. A constant flow valve seat is arranged and has a seat diameter that is the same as the diameter of the pressure receiving surface of the main valve body, and a constant flow valve is configured in correspondence with the valve seat from the secondary side thereof, and A constant flow valve body connected via a connecting rod, a pilot passage passing through the connecting rod and constant flow valve body and communicating a back pressure chamber to the secondary side of the main valve, and a pilot valve seat provided in the pilot passage. and a pilot that corresponds to the pilot valve seat from the secondary side and constitutes a pilot valve, and is connected to the float via a rod and opens and closes the pilot valve in conjunction with the vertical movement of the float as the water level rises and falls. Comprising a valve body and a constriction part provided in a flow path between the main valve and the constant flow valve, the pilot valve body and the rod are connected to each other in an abutting manner, and are constructed of separate members that can be moved into and out of contact with each other. The rod is provided with a pressure-receiving part for receiving the secondary water supply pressure in the direction of pushing down the rod, and a seal part is provided to prevent the secondary water supply pressure from going around to the lower surface of the pressure-receiving surface when the float is in the lowered position. A ball tap characterized by: