JPH0942519A - Nate stop valve for water boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To communicate a stop valve and a water governor at the downtream side of the stop valve through a valve hole, by composing the system to displace a diaphragm valve to the valve opening position to a back pressure chamber side to open the valve hole, by the elastic restoring force of the diaphragm to compose the diaphram valve. SOLUTION: To a diaphragm valve 511, an orifice hole 51d to communicate a valve chest 51a and a back pressure chamber 51c, and a bypass hole 51e to communicate the back pressure chamber 51c and a valve hole 51b, are formed. A bypass valve 513 is energized to the diaphragm valve 511 side by a spring 513a so as to block the bypass hole 51e by the bypass valve 513 constantly. When the bypass hole 51e is opened by retreating the bypass valve 513 against the spring 513a, the pressure of the back pressure chamber 51c is reduced, the disphragm valve 511 is displaced to the valve opening position at the back pressure chamber 51c side by the pressure difference with the valve chest 51a, and the valve hole 51b is opened so as to communicate the water to a water covernor 52. Consequently, a cutoff valve and the water covernor at the downstream side of the cutoff valve can be communicated through the valve hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water shutoff valve provided in a water valve unit for controlling water flow to a heat exchanger of a water heater.

[0002]

2. Description of the Related Art Conventionally, this type of water shutoff valve has
As disclosed in JP-A-49479, a valve seat that defines a valve chamber for a water shutoff valve in a valve casing, a diaphragm valve that opens and closes a valve hole formed in the valve seat, and a diaphragm valve for the valve chamber are used. Equipped with a bypass valve that is housed in a partitioned back pressure chamber and is biased toward the diaphragm valve side by a spring.The diaphragm valve has an orifice hole that connects the valve chamber and the back pressure chamber, and the back pressure chamber is the valve hole. Forming a bypass hole that communicates,
The bypass hole is normally closed by the bypass valve, and when the bypass valve is retracted by an external operation against the spring, the bypass hole is opened, the internal pressure of the back pressure chamber decreases, and the valve chamber and the back pressure chamber are separated. It is known that the diaphragm valve retracts to the back pressure chamber side due to the pressure difference, and the valve hole is opened to allow water to flow.

[0003]

The conventional diaphragm valve described above is configured to close the valve hole even in a free state in which the hydraulic pressure and the spring force of the bypass valve do not act. By the way, the water system valve unit is provided with a drain valve for the water shutoff valve and a water drain valve for the water governor provided on the downstream side of the water shutoff valve, and the diaphragm valve is closed and the water shutoff valve is closed. Even if the communication between the water governor and the water governor is cut off, the entire valve unit can be drained by opening both drainage stoppers, but in order to improve the drainability, the water shutoff valve and the water governor should be connected. Therefore, it is desirable to be able to take a breather between the two and obtain it. An object of the present invention is to provide a water shutoff valve that meets such a demand.

[0004]

In order to achieve the above object,
The present invention relates to a water stop valve provided in a water system valve unit for controlling water flow to a heat exchanger of a water heater, and a valve seat defining a valve chamber for the water stop valve in a valve casing, and a valve. A diaphragm valve that opens and closes the valve hole formed in the seat, and a bypass valve that is housed in a back pressure chamber that is partitioned from the valve chamber by the diaphragm valve and that is biased toward the diaphragm valve side by a spring are provided. An orifice hole that communicates the chamber with the back pressure chamber, and a bypass hole that communicates the back pressure chamber with the valve hole,
In a system in which the bypass hole is normally closed by the bypass valve and the bypass hole is opened when the bypass valve is retracted by an external operation against the spring, the diaphragm valve is operated by water pressure and the spring force of the bypass valve. It is characterized in that it is configured to be displaced by the elastic restoring force of the diaphragm constituting the diaphragm valve to the valve opening position on the side of the back pressure chamber where the valve hole is opened in the free state where it does not act.

According to this, when the bypass valve is retracted by an external operation against the spring when draining water, the diaphragm valve retracts to the open position, and the water shutoff valve and the water governor on the downstream side thereof are separated. Water is efficiently discharged by the breathing action between the two communicating with each other through the valve hole.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, reference numeral 1 denotes a water heater main body composed of a back plate 1a and a front cover 1b. The main body 1 has a gas burner 2 and a burner. And a heat exchanger 3 using 2 as a heat source, and
A water system valve unit 5 connected to the water pipe joint 4 at the lower end and a gas system valve unit 7 connected to the gas pipe joint 6 at the lower end are provided.

On the downstream side of the water valve unit 5, a heat exchange channel 8 passing through the heat exchanger 3 and a bypass channel 9 are connected, and the downstream end of the heat exchange channel 8 and the downstream end of the bypass channel 9 are connected. Mixing part 1 provided at the center of the lower end of the water heater body 1
The hot water outlet head 11 was connected to the mixing portion 10 via a flexible tube 12 at a flow rate of 0.

As shown schematically in FIG. 3, the gas system valve unit 7 includes, in order from the upstream side, a safety valve composed of a solenoid valve, and a gas valve 71 which is opened and closed in conjunction with a water governor which will be described later. A gas governor 72 and a gas amount adjusting valve 73 are provided. The gas amount adjusting valve 73 is the lever 1 shown in FIG.
3 is operated via the gear 14.

As shown in FIG. 4, the water-based valve unit 5 includes a valve casing 50 formed of a cast or forged product made of a corrosion-resistant metal material such as brass. It is configured by incorporating a governor 52, a water amount adjustment valve 53, and a venturi 54. The valve unit 5 is arranged in the water heater body 1 such that the water shutoff valve 51 and the water governor 52 are in a horizontal direction and the venturi 54 is located on the upper portion.

The water shutoff valve 51 is formed in a valve seat 510 and a valve seat 510 that define a water shutoff valve valve chamber 51a connected to an inlet 50a at the lower end of a valve casing 50 to which the water pipe joint 4 is connected. An opening 50 that opens and closes the valve hole 51b and is coaxial with the valve hole 51b formed in the valve casing 50.
It is composed of a diaphragm valve 511 attached to b and a bypass valve 513 housed in a back pressure chamber 51c defined by a diaphragm cover 512 on the back surface of the diaphragm valve 511. The diaphragm valve 511 is provided with an orifice hole 51d that connects the valve chamber 51a and the back pressure chamber 51c and a bypass hole 51e that connects the back pressure chamber 51c to the valve hole 51b. Is urged toward the diaphragm valve 511 side with the bypass valve 5
The bypass hole 51e is closed by 13. When the bypass valve 513 is retracted against the spring 513a to open the bypass hole 51e, the back pressure chamber 51
The pressure in c decreases, the diaphragm valve 511 is displaced to the valve opening position on the back pressure chamber 51c side due to the pressure difference from the valve chamber 51a, the valve hole 51b is opened, and water is passed to the water governor 52.

The valve seat 510 is mounted in the valve casing 50 from the lateral outside through the opening 50b.
It is made of a resin component such as a bottomed cylindrical polyacetal, and has a valve hole 51b at the bottom of the valve seat 510 facing outward in the lateral direction.
Has been established. By making the valve seat 510 made of resin in this way, the weight of the valve casing 50 can be reduced.

The diaphragm valve 511 is a diaphragm 5
11a is provided with a valve body portion 511b which is seated on the valve seat 510 and closes the valve hole 51b.
A guide portion 511c is provided on 11b so as to fit into the valve hole 51b even when the diaphragm valve 511 is fully opened. According to this, the diaphragm valve 511 has the guide portion 511c.
The diaphragm valve 511 can be prevented from vibrating in the radial direction by the flow of water when the valve is opened and the diaphragm valve 511 can be prevented from vibrating in the radial direction.
Even if the valve is arranged along the vertical plane, the valve body 511b is opened when the valve is opened.
Does not shift downward due to its own weight. Therefore, the diaphragm 511a is not overpowered and the diaphragm valve 511
Durability is improved. A water passage 511d is formed on the outer periphery of the guide portion 511c, and when the valve is opened, the water passage 511d is formed.
Water flows through d. Further, the throttle portion 5 that fits into the valve hole 51b with a slight gap at the base of the guide portion 511c.
11e is formed so as to buffer a rapid change in the water flow rate when the diaphragm valve 511 is opened and closed. The guide portion 511c is integrally formed with a resin contact plate 511f attached to the diaphragm 511a.

At the end face of the opening 50b of the valve casing 50, a bead 511g on the outer periphery of the diaphragm 511a is provided.
The stepped recess 5 reaching the inner peripheral surface of the opening 50b.
0c is formed, and on the other hand, an annular bead stopper 510a fitted to the inner peripheral surface of the opening 50b so as to reach the stepped recess 50c is provided on the valve seat 510 with a radial rib 51.
0b, the bead 511g does not project into the opening 50b even if the bead 511g is pulled radially inward by the displacement of the diaphragm valve 511 toward the back pressure chamber 51c. Although it is conceivable to form an annular groove having an inner groove wall corresponding to the bead stopper 510a on the end surface of the opening 50b, this makes the wall thickness of the peripheral wall portion of the valve casing 50 thicker by the groove wall. It has to be heavy and heavy. On the other hand, if the bead stopper 510a is integrally formed with the resin valve seat 510 as in the illustrated example, the valve casing 50 can be made lighter, which is advantageous. Further, the valve seat 510 can be centered with respect to the opening 50b through the bead stopper 510a, and even if the valve seat 510 is separated from the valve casing 50, the valve hole 5
This is advantageous because the concentricity between 1b and the diaphragm valve 511 can be secured.

The diaphragm cover 512 is formed by press-molding a steel plate. A resin rod guide 512a is mounted in the cover 512, and a rod 513b connected to a bypass valve 513 is passed through the rod guide 512a to pass the diaphragm cover 512a. To the outside. Then, the lever 16 interlocking with the operator 15 (see FIGS. 1 and 2) provided on the front surface of the water heater is engaged with the piece 513c at the outer end of the rod 513b, and the lever 16 and the rod are pushed by pushing the operator 15. The bypass valve 513 is pulled open against the biasing force of the spring 513a via the valve 513b, and the water shutoff valve 51 is opened as described above. The rod guide 5
12a is a non-circular locking portion 51 integrally formed at the end thereof.
2b is inserted into a non-circular hole formed in the end portion of the diaphragm cover 512 and rotated to be locked in the diaphragm cover 512. Diaphragm cover 512
As described above, the weight can be significantly reduced as compared with the conventional diaphragm cover made of cast metal, and the weight of the water-based valve unit 5 can be reduced.

The water governor 52 is a valve hole 51b of the water shutoff valve 51.
First valve seat 520 ₁ formed with a first valve hole 52c that communicates the primary pressure chamber 52a connected to the
And a second valve seat 520 having a second valve hole 52e that connects the primary pressure chamber 52a and the bypass chamber 52d at the tail thereof.
₂ , a diaphragm 521 attached to the opening 50d of the valve casing 50 facing the secondary pressure chamber 52b, a valve body 522 that interlocks with the diaphragm 521, and a diaphragm 52.
Diaphragm cover 523 defining the back pressure chamber 52f
And a rod 5 which is inserted into the diaphragm cover 523 and abuts on the piece 71b at the end of the valve rod 71a of the gas valve 71.
24 and 24.

The valve body 522 is provided with a valve rod portion 522a extending to the diaphragm 521 side through the first valve hole 52c, and a spring receiver 522b engaged with the tip of the valve rod portion 522a.
The valve body 522 is brought into contact with the diaphragm 521 via the spring receiver 522b by the urging force of the spring 522c that is contracted between the valve body 522 and the first valve seat 520 _1. I am trying to move.
A bypass passage 52g that connects the bypass chamber 52d and the secondary pressure chamber 52b is formed inside the valve body 522, and the first valve seat 520 ₁ is seated on the outer periphery of the valve body 522 to form the first valve. A first valve portion 522d that closes the hole 52c, and a second valve portion 522d that is inserted into the second valve hole 52e with a slight gap when the first valve portion 522d approaches the first valve seat 520 ₁ by a predetermined value or more. The valve part 522e is formed, and when the first valve hole 52c is closed, the second valve part 5 is provided from the primary pressure chamber 52a to the secondary pressure chamber 52b.
A required amount of water squeezed in the gap between the 22e and the second valve hole 52e flows through the bypass chamber 52d and the bypass passage 52g, and a sudden change in the water passage amount when the first valve hole 52c is opened and closed is caused. To be buffered.

The first valve seat 520 ₁ and the second valve seat 520 ₂ are
Valve casing 5 surrounded by the valve seat 510 of the water shutoff valve 51
It is integrally formed with the valve seat member 520 mounted in the space of 0. To describe this in detail, a tubular valve seat member 520 screwed through the opening 50d is provided in the valve casing 50, and an inflow port 520a is opened in the peripheral wall portion of the valve seat member 520, and the valve seat 520a is provided. An inlet 520 is provided on the inner circumference of the member 520.
The first valve seat 520 ₁ and the second valve seat 520 ₂ are formed integrally with each other at the tip and the tail of a, respectively, and the primary pressure chamber 52a and the bypass chamber 52d are formed in the valve seat member 520. . Then, the hole diameter of the second valve hole 52e is made larger than the outer diameter of the first valve portion 522d, and the valve seat member 520 is opened from the opening at the tail end.
After inserting 22, the lid member 520b is attached to the opening by caulking or the like to seal the opening. Thus, if integrally molded first and both the valve seat 520 ₁ of the second, 520 ₂ to a common valve seat member 520, and a concentricity and axial distance between Ryobenza 520 _1, 520 ₂ You will be able to manage it accurately, so
When the first valve hole 52c is closed, the water flow resistance between the second valve portion 522e and the second valve hole 52e is kept constant.
This is advantageous because the required governor characteristics can be stably obtained.

In the back pressure chamber 52f of the diaphragm 521,
Negative pressure generated in the venturi 54 when water is passed is the communication passage 55.
The diaphragm 521 is displaced toward the back pressure chamber 52f when water is passed, and the diaphragm 5
The rod 524 that comes into contact with the resin-made contact plate 521a attached to 21 is pushed outward, and the gas valve 71 is opened.

Here, the opening 5 of the valve casing 50
The end surface of 0d is located outside the seating portion of the diaphragm 521, and as shown in FIG. 6, a connection port 50e for introducing negative pressure, which is continuous with the communication passage 55, and, as shown in FIG. A connection port 50f for draining water, which is continuous with a drain plug 56 provided at the lower end portion, is opened. In addition, as shown in FIG. 7, an annular groove 523a into which the bead 521b on the outer periphery of the diaphragm 521 is inserted, and each connection port 50e outside the annular groove 523a are formed on the joint surface of the diaphragm cover 523 to the end surface of the opening 50d. , 50f are formed with recesses 523b and 523c that are continuous with the annular groove 523a and have a bottom surface that is flush with the bottom surface of the annular groove 523a. And the diaphragm cover 523
In addition, the communication holes 523d and 523e, which communicate with the back pressure chamber 52f, are formed in the bottom surfaces of the recessed portions 523b and 523c, and the recessed portions 52 are formed in the diaphragm 521.
Sealing rings 521c and 521d that are inserted into 3b and 523c and seal between the connection ports 50e and 50f and the communication holes 523d and 523e are integrally formed.

By the way, when the diaphragm cover 523 is made of metal casting, it is necessary to separately finish the annular groove 523a and the recessed portions 523b and 523c with different tools. And recess 523
Even if an attempt is made to finish flush with b and 523c, the annular groove 5
A small streak-like step is formed between 23a and the recesses 523b and 523c. When the seal rings 521c and 521d are integrated with the diaphragm 521, the step deteriorates the sealing performance.

Therefore, in this embodiment, the diaphragm cover 523 is made of a resin molded product, and the annular groove 523a and the recessed portions 523b and 523c are molded to form the annular groove 523.
The bottom surface of a and the bottom surfaces of the recesses 523b and 523c can be formed completely flush with each other. According to this, even if the seal rings 521c and 521d are integrated with the diaphragm 521 to reduce the number of parts, the sealing performance is not deteriorated.

Further, when the diaphragm cover 523 is made of a resin molded product, the wettability of water becomes lower than that of a cast product, so that water is less likely to adhere and remain on the inner surface of the diaphragm cover 523 when draining water. Since the thermal conductivity is also low, the freezing of water in the back pressure chamber 52f due to the decrease in temperature is unlikely to occur. Further, the diaphragm cover 523 is integrally formed with the guide portion 523f through which the rod 524 is inserted. However, when the diaphragm cover 523 is a resin molded product, the guide portion 523f is less likely to be bitten by the prying with the rod 524, so that The slidability of 524 is maintained good over a long period of time. As a material of the diaphragm cover 523, among the resins, the wettability of water, the thermal conductivity and the friction coefficient are low, and the strength is high.
Polyacetal is preferred.

The water amount adjusting valve 53 is a cylindrical valve chamber 53a which communicates with the secondary pressure chamber 51b of the water governor 51 on the back side of the paper surface of FIG.
Is equipped with a cylindrical valve body 530 rotatably attached to
As shown in FIG. 5, the valve body 530 has a valve casing 5
A valve hole 530a facing the outlet portion 50g for the heat exchange channel of 0;
A valve hole 530b facing the outlet portion 50h for the bypass water passage is formed. Then, a rotating member that rotates in conjunction with the operating element 15 is connected to the shaft portion 530c of the valve element 530 protruding to the front surface of the valve casing 50, and the rotating operation of the operating element 15 rotates the valve element 530. The amount of water passing through the heat exchange channel 8 and the bypass channel 9 can be dynamically increased or decreased.

The venturi 54 is horizontally arranged at the outlet 50g for the heat exchange channel. Then, in the venturi 54, a negative pressure outlet 54b is opened at the lower surface of the downstream portion of the minimum diameter portion 54a, and the negative pressure outlet 54b is formed.
Is communicated with the back pressure chamber 52f of the water governor 52 as described above through the communication passage 55 extending downward. According to this,
Open the water drain plug 56 to open the water governor 52 and its back pressure chamber 52.
When draining water with f, the water in the heat exchange passage 8 extending from the outlet 50g to the upper heat exchanger 3 is drained from the negative pressure outlet 54b through the communication passage 55 and the back pressure chamber 52f. . In this case, when the venturi 54 is arranged in a vertical posture, the negative pressure outlet 54b faces the horizontal direction, so that the portion of the communication passage 55 on the negative pressure outlet 54b side becomes horizontal, and water easily remains in this portion. If the venturi 54 is in a horizontal posture like this embodiment and the negative pressure outlet 54b is opened on the lower surface thereof, the communication passage 55 can be made to have a downward slope over the entire length, and water remains in the communication passage 55. There is no such thing. Further, although water is likely to remain in the minimum diameter portion 54a of the venturi 54, in the present embodiment, the negative pressure outlet 54 is located below the minimum diameter portion 54a.
Since b is open, water is smoothly drained from the minimum diameter portion 54a to the negative pressure outlet 54b, and no water remains in the minimum diameter portion 54a. Therefore, the venturi 54 and the communication passage 55
It is possible to effectively prevent freezing of water in the interior, prevent defective water flow during reuse and defective operation of the water governor 52, and improve cold resistance.

Further, in the present embodiment, the venturi 54
The venturi 54 is made of a resin, which is separate from the valve casing 50, in order to improve the drainability by lowering the wettability of water with respect to the venturi 54 and reduce the thermal conductivity of the venturi 54 more effectively to prevent freezing. It is composed of parts.
As a material for the venturi 54, polyacetal having low wettability with water and low thermal conductivity is suitable. Further, in the present embodiment, the negative pressure outlet 54 is attached to the mounting portion of the venturi 54.
An annular space 54c communicating with b is formed, and the annular space 54c is formed.
The upper end of the communication passage 55 is opened at the lower surface of c. According to this, the drainage from the negative pressure outlet 54b is further improved by the breathing action of the air in the annular space 54c, and the freezing is more effectively prevented by the heat insulating action of the annular space 54c.

By the way, it is conceivable that the communication passage 55 is constituted by an external pipe member which is connected to the diaphragm cover 523, but this makes the piping structure complicated and the cost high, and the communication passage 55 is connected to the communication passage 55 for the convenience of piping. A bent portion is formed, and water easily remains in the bent portion. Therefore, in the present embodiment, a straight hole extending downward from the negative pressure outlet 54b to reach the negative pressure introducing connection port 50e is formed in the valve casing 50, and the communication passage 55 is formed by the hole. .

At the time of draining water, the water in the water shutoff valve 51 is drained by draining the water from the water pipe joint 4 as well. In this case, the bypass valve 513 of the water shutoff valve 51 is opened by pushing the operator 15 via the lever 16 to bring the diaphragm valve 511 into a free state in which the hydraulic pressure and the spring 513a of the bypass valve 513 do not act. Here, the diaphragm valve 5
11 is a valve hole 51 in the free state as shown in FIG.
The diaphragm 51 is opened at the valve opening position on the side of the back pressure chamber 51c that opens b.
It is configured to be displaced by the elastic restoring force of 1a. Therefore, at the time of draining water, a breather action can be obtained between the water shutoff valve 51 and the water governor 52 via the valve hole 51b, and the water system valve unit 5 can be drained efficiently.

[0028]

As is apparent from the above description, according to the present invention, the diaphragm valve can be opened when draining water, and the water can be efficiently drained from the water system valve unit.

[Brief description of drawings]

FIG. 1 is a front view of an example of a water heater to which the present invention is applied, with a front cover removed.

FIG. 2 is a right side view of FIG.

FIG. 3 is a diagram schematically showing a gas valve unit.

FIG. 4 is a cutaway front view of the water valve unit.

FIG. 5 is a right side view of FIG.

6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a perspective view of a diaphragm cover and a diaphragm.

FIG. 8 is a cutaway front view showing a state of a water shutoff valve when draining water.

[Explanation of symbols]

 3 heat exchanger 5 water system valve unit 50 valve casing 51 water stop valve 51a valve chamber 51b valve hole 51c back pressure chamber 51d orifice hole 51e bypass hole 510 valve seat 511 diaphragm valve 511a diaphragm 513 bypass valve 513a spring

Claims (1)

[Claims] 1. A water stop valve provided in a water system valve unit for controlling water flow to a heat exchanger of a water heater, the valve seat defining a valve chamber for the water stop valve in a valve casing, A diaphragm valve that opens and closes the valve hole formed in the valve seat, and a bypass valve that is housed in a back pressure chamber that is partitioned from the valve chamber by the diaphragm valve and that is biased toward the diaphragm valve by a spring are provided. An orifice hole that communicates the valve chamber with the back pressure chamber and a bypass hole that communicates the back pressure chamber with the valve hole are formed.The bypass hole is normally closed by the bypass valve, and the bypass valve is protected from the spring by an external operation. When the bypass valve is opened when retracted, the diaphragm valve is moved to the valve opening position on the back pressure chamber side where the valve hole is opened in a free state where water pressure and the spring force of the bypass valve do not act. The valves that make up the valve A water shutoff valve for a water heater, wherein the water shutoff valve is configured to be displaced by an elastic restoring force of an earflam.