KR100220314B1 - Stop valve using hot water device - Google Patents

Abstract

[purpose]

The valve casing of the water supply valve unit in the hot water heater is reduced in weight.

[Configuration]

The valve seat 510 for dividing the valve chamber 51a for the stop valve in the valve casing 50 is formed of a resin component separately from the valve casing 50. The bead 511g formed in the outer periphery of the diaphragm 511a which comprises the diaphragm valve 511 is fitted in the end surface of the opening 50b of the valve casing 50 in which the diaphragm valve 511 for a stop valve is mounted. A stepped concave portion 50c reaching the inner circumferential surface of the opening 50b is formed. The valve seat 510 is integrally formed with an annular bead stopper 510a fitted to reach the stepped concave portion 50c formed on the inner circumferential surface of the opening 50b.

Description

Hot water stop valve

1 is a front view of a state in which the front cover is removed as an example of a hot water heater to which the present invention is applied.

2 is a right side view of FIG.

3 is a diagram schematically showing a gas-based valve unit.

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

5 is a right side view of FIG.

6 is a cross-sectional view taken along the line VI-Vl of FIG.

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

8 is a cutaway front view showing the state of the stop valve at the time of drainage.

9 is a perspective view showing a state in which the valve seat is disassembled in the valve casing.

* Explanation of symbols for main parts of the drawings

3: heat exchanger 5: water meter valve unit

50: valve casing 50b: opening

50c: stepped concave portion (concave portion having stepped portion)

51: stop valve 51a: valve chamber

51b: valve hole 510: valve seat

510a: bead stopper 511: diaphragm valve

511a: Diaphragm 511g: Bead

[TECHNICAL FIELD OF THE INVENTION]

The present invention relates to a stop valve installed in the water supply valve unit for controlling the water flow to the heat exchanger of the hot water heater.

[Prior art]

As a conventional stop valve of this kind, as disclosed in Japanese Utility Model Publication No. Hei 2-49479, a valve hole is formed in a valve seat for partitioning a valve chamber for a stop valve in a valve casing, and a valve is provided in the valve casing. BACKGROUND ART It is known that a diaphragm valve for a stop valve is formed in which an opening portion located on the same axis as the hole is formed, and the opening and closing of the valve hole is provided.

In this conventional case, the valve seat is integrally formed with the valve casing, and an annular flaw is formed in the opening end face of the valve casing, in which a bead is formed at the outer periphery of the diaphragm constituting the diaphragm valve, thereby forming the diaphragm. (Sealability) is secured.

[Problems that the invention tries to solve]

When the diaphragm is displaced in the direction away from the valve seat, since the beads formed in the outer periphery of the diaphragm are tensioned inward in the radial direction, it is necessary to prevent the beads from protruding into the inner periphery of the opening of the valve casing.

In the above-described conventional example, the radially inner flaw wall in the annular groove acts as a stopper to prevent the bead from penetrating the inner circumference of the opening, but the thickness of the valve casing becomes thicker for the groove wall. Here, since the valve casing is formed of a cast or forged product of a corrosion-resistant metal material such as brass, the specific gravity is large, and when the valve seat is integrally formed as in the prior art, the thickness of the valve casing becomes heavy.

In view of the above, it is an object of the present invention to provide a stop valve capable of reducing the weight of the valve casing.

[Means for solving the problem]

In order to achieve the above object, the present invention is a stop valve provided in the water supply valve unit for controlling the water flow to the heat exchange chamber of the hot water heater, the valve hole is formed in the valve seat partitioning the valve valve for the stop valve in the valve casing In the valve casing, the diaphragm constituting the diaphragm valve is formed on the end face of the opening of the valve casing by forming an opening positioned at the same axis as the valve hole and opening and closing the valve hole in the opening. The bead of the outer periphery of the valve is fitted to form a stepped recess reaching the inner circumferential surface of the opening of the valve casing, and the valve seat is made of a resin component separate from the valve casing. Integrally an annular bead stopper fitted to reach the stepped recess formed on the inner circumferential surface of the opening It is characterized by being molded.

Since the valve seat is made of a resin component, the weight can be reduced, and the bead stopper formed integrally with the valve seat can prevent the beads of the outer circumference of the diaphragm from protruding from the inner circumference of the opening. Since it is not necessary to form the groove wall for the stopper at the end face of the opening, the thickness of the valve casing can be made thinner, and the weight of the valve casing can be greatly reduced.

In addition, when the valve seat is separate from the valve casing, the problem is how to secure the center position between the valve hole and the opening of the valve casing. However, according to the present invention, the bead stopper integrally formed in the valve seat is formed. Is fitted on the inner circumference of the opening, that is, because the bead stopper acts as a guide for center positioning and secures the center positioning between the valve hole and the opening, there is no quality problem even if the valve seat is separately.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail based on drawing.

In FIG. 1 and FIG. 2, 1 is a hot water heater main body which consists of a back plate la and the front cover 1b, and this hot water heater main body 1 has a gas burner 2 and this gas burner 2, respectively. Is provided as a heat source (3), the water supply valve unit (5) connected to the water pipe joint (4) at the lower end, and the gas valve unit connected to the gas pipe joint (6) at the lower end. (7) is provided.

On the downstream side of the water supply valve unit 5, a heat exchange channel 8 and a bypass channel 9 which pass through the heat exchanger 3 are connected, and a downstream end of the heat exchange channel 8 The downstream end of the bypass channel 9 is joined to the mixing section 10 provided at the lower center portion of the water heater body 1, and the tapping head 11 is connected to the mixing section 10 with the flexible pipe 12. Connected through.

As shown schematically in FIG. 3, the gas-based valve unit 7 includes a safety valve that is a solenoid valve sequentially from the upstream side and a gas valve 71 that is opened and closed in conjunction with a water supply governor 52 described later. And a gas governor 72 and a gas and regulating valve 73 are provided. The gas amount regulating valve 73 is operated via the gear 14 by the lever 13 shown in FIG.

Further, as shown in FIG. 4, the water supply valve unit 5 is a valve casing 50 formed of a cast or forged product of a corrosion-resistant metal material such as brass. And a water feed governor 52, a water quantity regulating valve 53, and a venturi 54 in combination. In addition, the water supply valve unit 5 is disposed in the water heater main body 1 so that the stop valve 51 and the water supply governor 52 are placed in the transverse direction, and the venturi 54 is positioned at the upper portion thereof.

The stop valve 51 includes a valve seat 510 which partitions the valve chamber 51a for the stop valve connected to the lower end inlet 50a of the valve casing 50 to which the water pipe joint 4 is connected, and the valve seat. A diaphragm valve 511 attached to an opening 50b on the same axis as the valve hole 51b formed in the valve casing 50 while opening and closing the valve hole 51b formed in the 51a, and a diaphragm valve. The bypass valve 513 accommodated in the back pressure chamber 51c partitioned by the diaphragm cover 512 which covers the back side of 511 is comprised. The diaphragm valve 511 is provided with an orifice hole 516 for communicating the valve chamber 51a and the back pressure chamber 51c, and a bypass hole 51e for communicating the back pressure chamber 51c with the valve hole 51b. The bypass valve 513 is held by the spring 513a toward the diaphragm valve 511 side, and the bypass hole 51e is closed by the bypass valve 513 in normal operation. When the bypass valve 513 is retracted against the spring 513a and the bypass hole 51e is opened, the pressure in the back pressure chamber 51c is lowered. Therefore, due to the pressure difference from the valve chamber 51a. When the diaphragm valve 511 is displaced to the open position on the side of the back pressure chamber 51c, the valve hole 51b is opened and passed through the water supply governor i2.

The valve seat 510 is mounted in the valve casing 50 through the opening portion 50b from the outside in the lateral direction, and is made of a resin component such as a cylindrical polyacetal having a bottom portion, and is directed toward the outside in the lateral direction. The valve hole 51b is formed in the bottom of the seat 510. Thus, by making the valve seat 510 resin, the weight of the valve casing 50 can be reduced.

The diaphragm valve 511 has a valve body portion 511b attached to the diaphragm 511a which abuts against the valve seat 510 and closes the valve hole 51b. The diaphragm valve 511b has a diaphragm valve. Even when 511 is fully open, the guide part 511c fitted in the valve hole 51b protrudes. In this way, the diaphragm valve 511 is always positioned at the center position of the valve hole 51b via the guide portion 511c, so that the diaphragm valve 511 vibrates in the radial direction due to the flow of water at the time of valve opening. In addition, even if the diaphragm valve 511 is arrange | positioned along a perpendicular surface like the example shown in the figure, the valve body part 511b does not bias downward by its own weight at the time of valve opening. Therefore, since an excessive force does not act on the diaphragm 511a, the durability of the diaphragm valve 511 is improved. A water passage 511d is formed in the outer circumference of the guide portion 511c, and water flows through the water passage groove 511d when the valve is opened. The valve hole 51b is formed at the base of the guide portion 511c. Throttle portion 511e fitted with a small gap therebetween to buffer a sudden change in the amount of water flow when opening and closing the diaphragm valve 511. In addition, the guide part 511c is integrally molded with the resin contact plate 511g attached to the diaphragm 511a.

The recessed part 50c which has a step part in the inner peripheral surface side of the opening part 50b in which the bead 511g of the outer periphery of the diaphragm 511a is fitted in the cross section of the opening part 50b of the valve casing 50 is called a step recessed part hereafter. And an annular bead stopper 510a fitted to the valve seat 510 to the position of the stepped concave portion 50c on the inner circumferential surface of the opening 50b. By integrally forming the mold (see FIG. 9), the beads 511g protrude into the opening 50b even when the beads 511g are tensioned inward in the radial direction due to displacement of the diaphragm valve 511 toward the back pressure chamber 51c. I do not want to. It is also conceivable to form an annular flaw having an inner groove wall corresponding to the bead stopper 510a in the cross section of the opening 50b. In this case, however, the thickness of the circumferential wall portion of the valve casing 50 is the thickness of the groove wall. You have to thicken it as much as you want, and the weight becomes heavy.

On the other hand, when the bead stopper 510a is integrally molded to the valve seat 510 made of resin as in the illustrated example, the valve casing 50 can be reduced in weight, so that the valve casing 50 can be handled as well as the entire product. And transportation or installation are advantageous.

Further, since the valve seat 510 can be positioned at the center position of the opening 50b via the bead stopper 510a, the valve hole 51b is formed even if the valve seat 510 is formed separately from the valve casing 50. It is advantageous because it is possible to secure the central positioning degree of the diaphragm valve 511.

The diaphragm cover 512 is composed of a press-formed product of copper plate, and a rod 513b made of resin is mounted in the diaphragm cover 512, and a rod 513b connected to the bypass valve 513 is provided with this rod. It protruded out of the diaphragm cover 512b through the guide 512a. Then, the lever 16, which interlocks with the operator 15 (see FIGS. 1 and 2) installed on the front of the hot water heater, is engaged with the tip 513c of the outer end of the rod 513b, and the operator 15 pushes the operation. By opening the bypass valve 513 through the lever 16 and the rod 513b against the coalescing force of the spring 513a, the stop valve 51 was opened as described above. Further, the rod guide 512a is inserted into the diaphragm cover 512 by rotating the non-circular locking portion 512b integrally formed at the end thereof into the non-circular hole formed in the end portion of the diaphragm cover 512. I get caught. By configuring the diaphragm cover 512 as described above, the weight can be significantly reduced compared to the conventional cast diaphragm cover, and the water supply valve unit 5 can be lightened.

The water supply governor 52 has a first valve hole 52c for communicating the primary pressure chamber 512a connected to the valve hole 51b of the stop valve 51 and the secondary pressure chamber 52b in front of it. A second valve seat 5202 formed with a second valve hole 52e for communicating the first valve seat 5201, the primary pressure chamber 52a and the bypass chamber 526 behind it, and a valve casing ( The diaphragm 521 attached to the opening 50d facing the secondary pressure chamber 52b of the 50, the valve body 522 interlocking with the diaphragm 521, and the back pressure chamber 523 of the diaphragm 521 The diaphragm cover 523 which is partitioned off, and the rod 524 which fits in the diaphragm cover 523 and contact the tip 71b of the edge part of the valve rod 71a of the said gas valve 71 are comprised.

The valve body 522 has a valve rod portion 522a which extends to the diaphragm 521 side through the first valve hole 52c, and is provided with a spring support 522b which is mounted on the tip of the valve rod portion i22a. ) And the diaphragm 521 by contacting the diaphragm 521 via the spring receiving 522b by the holding force of the spring 522c mounted between the first valve seat 5201 and the first valve seat 5201. Thus, the valve body 522 is moved in the axial direction.

In addition, a bypass passage 52g for communicating the bypass chamber 526 and the secondary pressure chamber 52b in the valve body 522 is formed, and the first valve seat is formed on the outer circumference of the valve body 522. 2nd when the 1st valve part 5262 and the 1st valve part 522d approach the 1st valve seat 5201 more than a predetermined value in contact with 5201, and close the 1st valve hole 52c. When the 2nd valve part 522e which forms a little gap in the valve hole 52e is formed, and the 1st valve hole 52c is occluded, from the primary pressure chamber 52a to the secondary pressure chamber 52b, The required amount of water interrupted by the gap between the second valve portion 522e and the second valve hole 52e flows through the bypass chamber 526 and the bypass passage 52g, whereby the first valve hole 52c. The sudden change in the amount of water flowing at the opening and closing of the) was buffered.

The first valve seat 5201 and the second valve seat 5202 are integrally formed with the valve seat member 520 mounted in the space in the valve casing 50 surrounded by the valve seat 510 of the stop valve 51. Formed. In detail, the tubular valve seat member 520 that is screwed through the opening 50d is provided in the valve casing 50, and the inlet port 520a is provided in the peripheral wall of the valve seat member 520. In addition, the first valve seat 5201 and the second valve seat 5202 are integrally formed with the valve seat member 520 in front and rear of the inlet 520a on the inner circumference of the valve seat member 520, respectively. The primary pressure chamber 52a and the bypass chamber 52d are formed in 520. After the diameter of the second valve hole 52e is made larger than the outer diameter of the first valve portion 522d, the valve body 522 is inserted into the valve seat member 520 through the rear end opening 50d. The cover member 520b is attached to this opening 50d by caulking, etc., and it seals. As such, when the first valve seat 5201 and the second valve seat 5202 are integrally formed on the common valve seat member 520, the center position determination and the axial distance between the valve seats 5201 and 5202 can be accurately obtained. As a result, it is possible to manage, and therefore, an abnormality does not occur in the water resistance between the second valve portion 522e and the second valve hole 52e when the first valve hole 52c is closed, thereby requiring governor characteristics. It is advantageous to be able to obtain stably.

In the back pressure chamber 521 of the diaphragm 521, the negative pressure generated in the venturi 54 at the time of water flow is introduced through the communication path 55, and the diaphragm 521 is moved toward the back pressure chamber 52f at the time of water flow. The gas valve 71 is opened by being displaced so that the rod 524 which is in contact with the resin-contacting plate 521a attached to the diaphragm 521 is pressed outward.

Here, in the end surface of the opening part 506 of the valve casing 50, it is located outside the mounting part of the diaphragm 511, and it connects to the negative pressure introduction connection port 50e connected to the communication path 55 as shown in FIG. As shown in FIG. 4, the drain connection port 50f connected to the drain valve 56 provided in the lower end part of the valve casing 50 is formed. Moreover, as shown in FIG. 7, the mating groove 523a in which the bead 521b of the outer periphery of the diaphragm 521 fits in the joining surface of the diaphragm cover 523 with respect to the cross section of the opening 50d, and this Each recessed part 523b, 523c which has the bottom face which matches the bottom face of the annular groove 523a in the part which opposes each connection port 50e, 50f of the outer side of the annular groove 523a is the annular groove 523a. Is formed continuously). In the diaphragm cover 523, communication holes 523d and 523e communicating with the back pressure chamber 52f are formed in the bottom surfaces of the recesses 523b and 523c, and the recesses are formed in the diaphragm 521. Seals 521c and 521d integrally formed at 523b and 523c to seal between the connection ports 50e and 501 and the communication holes 5236 and 523e are integrally formed.

By the way, when the diaphragm cover 523 is made of a metal casting, it is necessary to separately finish the finishing of the annular grooves 523a and the finishing of the recesses 523b and 523c with the respective tools. Even when attempting to smoothly trim the 523a and the recesses 523b and 523c, a stem-shaped minute step is generated between the annular grooves 523a and the recesses 523b and 523c. When the seals 521c and 521d are integrated with the diaphragm 521, the practicality is damaged by the step.

Here, in the present embodiment, the diaphragm cover 523 is formed of a resin molded product, and the annular grooves 523a and the recesses 523b and 523c are molded to form the bottom surface and the recesses 521c, The bottom of 523c) was formed to be completely matched. According to this, even if the seals 521c and 521d are integrated with the diaphragm 521, even if the number of parts is reduced, the practicality will not be impaired.

In addition, when the diaphragm cover 523 is made of a resin molded product, since the wettability of the water is lower than that of the casting product, water is less likely to remain on the inner surface of the diaphragm cover 523 during drainage, and the thermal conductivity is also high. Since it becomes low, freezing of water in the back pressure chamber 52f by the fall of air temperature will also become difficult to occur. In addition, the diaphragm cover 523 is integrally formed with a guide portion 523f through which the rod 524 is inserted. When the diaphragm cover 523 is a resin molded product, the rod 524 in the guide portion 523f is formed. Leading parts due to twisting of the wand are less likely to occur, so that the sliding property of the rod 524 is maintained for a long time. As the material of the diaphragm cover 523, polyacetal having low wettability, thermal conductivity or low coefficient of friction and high strength is suitable among resins.

The water volume adjustment valve 53 is a tubular valve body mounted freely in a tubular valve chamber 53a which communicates with the secondary pressure chamber 52b of the water supply governor 52 and the tubular valve chamber 53a communicated from the back side of FIG. 530, the valve body 530, as shown in FIG. 5, a valve hole 530a facing the heat exchange channel outlet portion 50g of the valve casing 50, and a bypass channel. A valve hole 530b opposed to the dragon outlet portion 50h was formed. Then, a rotating member that rotates in conjunction with the operator 15 is connected to the shaft portion 530c of the valve body 530 that protrudes toward the front side of the valve casing 50, and the valve body is operated by the rotation operation of the operator 15. By the rotation of 530, the flow rate of the heat exchange channel 9 and the bypass channel 9 can be increased or decreased.

The venturi 54 is arranged in a horizontal position at the outlet portion 50g for the heat exchange channel. In the venturi 54, a negative pressure outlet 54b is formed on the lower surface of the downstream portion of the minimum diameter portion 54a, and the negative pressure outlet 54b extends downwardly through the communication path 55. Similarly, it communicates with the back pressure chamber 52f of the water supply governor 52. As shown in FIG. In this way, when the drain valve 56 is opened to drain the water supply governor 52 and its back pressure chamber 52f, the heat exchange water passage extending from the outlet portion 50g to the upper heat exchanger 3 ( The water in 8) is drained through the communication path 55 and the back pressure chamber 52f at the negative pressure ejection outlet 54b. In this case, when the venturi 54 is placed in a vertical position, the negative pressure outlet port 54b faces the horizontal direction, so that the portion on the negative pressure outlet port 54b side of the communication path 55 is in a horizontal state, and water However, if the venturi 54 is horizontally positioned and the negative pressure ejection outlet 54b is formed on the bottom surface of the venturi 54 as in the present embodiment, a downward slope can be made in the communication path 55 over the entire length, and the communication path 55 is provided. There is no water left. Moreover, although water is easy to remain in the minimum diameter part 54a of the venturi 54, since the negative pressure extraction port 54b is formed below the minimum diameter part 54 in this embodiment, the minimum diameter part 54a is provided. Because it is discharged smoothly to the negative pressure outlet (54b) in the water does not remain in the minimum diameter (54a). Therefore, the freezing of water in the venturi 54 or the communication path 55 can be effectively prevented, and the cold resistance at the time of reuse and the malfunction of the water supply governor 52 do not occur, so the cold resistance is improved.

In addition, in the present embodiment, the venturi 54 is lowered so that the moisture of the venturi 54 is lowered to improve drainage and the thermal conductivity of the venturi 54 is lowered to more effectively prevent freezing. It consists of resin components separate from the valve casing 50. As shown in FIG. As the material of the venturi 54, polyacetal having low wettability and low thermal conductivity of water is suitable. Moreover, in this embodiment, the annular space 54c which communicates with the negative pressure extraction port 54b in the mounting part of the venturi 54 is formed, and the upper end of the communication path 55 is provided in the lower surface of this annular space 54c. In this way, the drainage at the negative pressure ejection outlet 54b is further improved by the air breather action by the air in the annular space 54c, and the freezing is more effectively performed by the adiabatic action of the annular space 54c. It can be prevented.

By the way, it is conceivable to configure the communication path 55 by an external piping member connecting to the diaphragm cover i23. However, in this case, the piping structure becomes complicated, the cost is increased, and the communication path 55 is formed in the shape of the pipe. Bends are formed in the water, and water is easily left in the bends. Here, in this embodiment, the valve casing 50 is formed with a straight hole extending downward from the negative pressure outlet port 54b to reach the negative pressure introduction connector 50e, and the hole is constituted by the communication path 55. It was.

At the time of drainage, the water pipe joint 4 is also drained and drained in the stop valve lean. In this case, the bypass valve 513 of the stop valve 51 is opened through the lever 16 by pressing the operator 15, and the diaphragm valve 511 is opened by the hydraulic pressure and the spring of the bypass valve 513. 513a is set to a free state in which it does not act. In this free state, the diaphragm valve 511 is configured to be displaced by the elastic restoring force of the diaphragm 511a to the valve opening position on the side of the back pressure chamber 51c which opens the valve hole 51b as shown in FIG. . Therefore, at the time of drainage, the air breather action is obtained through the valve hole 51b between the stop valve 51 and the water supply governor 52, so that the drainage of the water supply valve unit 5 can be efficiently performed.

[Effects of the Invention]

As can be seen from the above description, according to the present invention, the weight of the valve casing can be reduced without affecting the quality of the stop valve, thereby making it possible to reduce the weight of the hot water heater for the water supply valve unit.

Claims (1)

A stop valve installed in a water supply valve unit for controlling water flow to a heat exchange chamber of a hot water heater, wherein a valve hole is formed in a valve seat for dividing a valve chamber for a stop valve in the valve casing, and the valve casing is formed on the same axis as the valve hole. In the diaphragm valve for stop valve which forms the opening part located and opens and closes a bulb hole, the bead of the outer periphery of the diaphragm which comprises a diaphragm valve is fitted in the opening end surface of the said valve casing, In addition to forming a stepped recess reaching the inner circumferential surface of the opening of the casing, the valve seat is made of a resin component separate from the valve casing, and the stepped recess formed on the inner circumferential surface of the opening of the valve casing. For hot water heater characterized in that the integrally formed annular bead stopper fitted to reach Stop valve.