JPH07103935B2 - Automatic pressure regulator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic pressure regulating valve which is provided immediately before a hot and cold water mixing device used for hot water supply and which equalizes the supply pressures of hot water and water.

2. Description of the Related Art Conventionally, as this type of automatic pressure regulating valve, there is one as shown in FIG. (For example, JP-A-56-90175) In FIG. 2, a cylinder 2 is attached to a main body 1, and a hot water side valve seat 3 and a water side valve seat 4 are formed at an open end of the cylinder 2.
A disc-shaped hot water valve body 5 and a water side valve body 6 each have a valve body 8 provided with a valve shaft 7, and the hot water side valve seat 3 and the water side valve seat 4 respectively correspond to the outside of the cylinder 2 to form a valve. A disk-shaped pressure receiving member 9 in which a shaft 7 extends into the cylinder 2 and is slidably inserted into the cylinder 2.
A hot water chamber 11 is provided between the hot water valve body 5 and the pressure receiving member 9, and a water chamber 12 is provided between the hot water valve body 6 and the pressure receiving member 9. One valve element (5 or 6) due to sliding of the pressure receiving member 9 due to fluctuations in pressure balance between the hot water chamber 11 and the water chamber 12.
When one approaches the corresponding valve seat (3 or 4), the other valve body (5 or 6) moves away from the corresponding valve seat (3 or 4), and the supply pressures of hot water and water are always equal. To do.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, dust, scale, or the like may be attached to a slight gap between the pressure receiving member 9 that slides with the cylinder 2, and the pressure adjusting function thereof is significantly deteriorated. May occur. In addition, rattling is likely to occur in the radial direction with the pressure receiving member 9 as a fulcrum, and the rattling hinders smooth sliding, and the function is likely to deteriorate.
Even if the width of the pressure receiving member 9 is wide and it is possible to guide, the contact area with the cylinder 2 will be large.
Not only the sliding friction resistance is increased, but also the weight of the sliding portion including the valve body 9 is increased, so that it becomes impossible to respond to a slight pressure balance loss, and therefore the hot and cold water mixing device behind the automatic pressure regulating valve. There was a problem that the temperature of the mixed water discharged from the tank fluctuated.

The present invention solves the conventional problems, and an object of the present invention is to provide an automatic pressure regulating valve having a pressure regulating function and excellent durability and reliability that is resistant to scale adhesion and dust clogging.

Means for Solving the Problems In order to solve the above problems, the automatic pressure regulating valve of the invention is a hot water flow path and a water flow path, a cylinder, and a piston that partitions the hot water flow path and the water flow path that slide in the cylinder. , A valve shaft fixedly provided on the piston, a hot water valve body and a water valve body for reducing the primary pressure of the hot water flow path and the water flow path, which are provided on the valve shaft so as to face each other with the piston interposed therebetween, and the cylinder. The hot water valve seat and the water valve seat that are provided, and the runout of the valve shaft integrally configured on the hot water valve body and the hot water valve body, respectively, are eliminated, and the hot water flow path and the hot water flow path cause the hot water side valve body. And a screw-shaped guide means for twisting the water-side valve element and the piston in the same direction and twisted in opposite directions.

Action According to the present invention, due to the above-described configuration, when one valve body approaches the corresponding valve seat due to the fluctuation of the secondary pressure balance of the hot water and the other water, the other valve body moves in the direction away from the corresponding valve seat. Inverse proportional opening / closing operation always equalizes the secondary pressure of hot water and water.The screw-shaped guide means provided in the valve body and twisted in opposite directions eliminates rattling at the start of use In addition to facilitating the transition to, the swirling is promoted, the pressure regulation performance is improved by reducing the sliding resistance, the leak of hot and cold water at the piston part is reduced, scale adhesion is prevented, and clogging of dust is forcibly eliminated. It is a thing.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, the automatic pressure regulating valve according to the present embodiment includes a hot water valve body 15 and a hot water valve seat for reducing the primary pressure of the hot water flow paths 13 and 14.
16 and a water side valve body 17 and a water side valve seat 18, and the two valve seats (16, 18) are formed by chamfering both ends of a cylinder 19. Here, the cylinder 19 is the same even if it is directly processed into a valve seat body. Further, in the cylinder 19, a piston 20 that partitions the hot water flow path 13 and the water flow path 14 that slide in the cylinder 19, and a piston 20 with the hot water side valve body 15 and the water side valve body 17 facing each other with the piston 20 in between A valve shaft 21 fixed to 20 is provided. Hot water valve body
The valve shaft 21 formed integrally with the water valve body 15 and the water side valve body 17 has no runout, and the flow of the hot water flow path 13 and the water flow path 14 allows the hot water side valve body
Blades 22 and 23, which are screw-shaped guide means twisted in mutually opposite directions for turning the water-side valve body 17 and the piston 20 in the same direction, are provided. The blades 22 and 23 are provided on the hot water valve body 15 and the water side valve body 17, which are opposed to each other, by being twisted in the opposite directions, so that swirling is promoted. Further, the blades 22 and 23, which are the guide means, allow the hot water valve body 15 and the water side valve body 17 to operate.
The amount of backlash is reduced, and it is possible to smoothly transition to a turning state even with a small flow rate. The hot water valve body 15 and the water valve body 17
Is smaller than the inner diameter of the cylinder 19 and has the same diameter as the piston 20.

With the above configuration, the valve body 15
When the valve body (15 or 17) approaches the corresponding valve seat (16 or 18) due to the fluctuation of the secondary pressure balance after decompression, the other valve cancels between the (17) and the piston 20. The body (17 or 15) has a corresponding valve seat (18 or 1
6) Performs an inverse proportional opening / closing operation of moving in a direction away from each other so that the secondary pressures of hot water and water are always equal.

The advantage of this embodiment is that the blades 2 provided on the two valve bodies 15 and 17 are
2 and 23, the two valve bodies 15 and 17 and the piston 20 are swung in the cylinder 16 and floated by centripetal action, whereby the friction between the piston 20 and the cylinder 16 acts not by static friction but by dynamic friction. The reduction of sliding resistance is mentioned. By reducing the sliding resistance, the valve bodies 15 and 17 and the piston can operate even with a slight difference in secondary pressure, and the pressure adjusting function can be improved. In addition, the centripetal action due to the swiveling makes the surface of the piston 20 and the cylinder 16 uniform,
The leakage of hot water from the high pressure side to the low pressure side can be reduced. Further, since the blades 22 and 23 are twisted in the opposite directions, swirling is promoted, the pressure regulating function is further improved and leakage is reduced, and the hot water valve body 15 and the water valve body, and the piston 20 part It is possible to improve the durability and reliability by preventing the scale from sticking and forcibly eliminating the clogging of dust.

In addition, the two valve bodies 15 and 17 have screw-shaped guide means 2
One block in which the valve bodies 15 and 17 and the piston 20 are fixed by the valve shaft 21 because 4 is integrally molded of resin, coaxial processing can be easily performed in a short time, and the diameter is formed smaller than the inner diameter of the cylinder 19. Can be inserted into the cylinder 19 as
It is easy to assemble, easy to maintain, and inexpensive because it has a small number of parts.

Effects of the Invention As described above, according to the automatic pressure regulating valve of the present invention, the following effects are obtained.

(1) Since the screw-shaped guide means is provided on each of the hot water valve body and the water water valve body that face each other with the piston in between, the hot water valve body, the water water valve body, and the space between the piston and the cylinder. There is less backlash, and the transition to a turning state can be done smoothly.

(2) Since the screw-shaped guide means are twisted in opposite directions, the flow of the hot water and the flow of the water turn the hot water valve body and the hot water valve body in the same direction, so that the swirling is promoted and the piston is moved in the cylinder. The gyration causes a centripetal action to levitate, which improves the pressure-regulating function by reducing sliding resistance, and the uniform clearance between the piston and cylinder prevents leakage of hot water and water from the high-pressure side to the low-pressure side. Reduction, prevention of scale adhesion, and forced elimination of dust clogging can improve durability and reliability.

(3) Since the hot water side valve seat and the water side valve seat are provided in the cylinder, the gap between the hot water side valve body and the water side valve body, which are swung by the screw-shaped guide means in the cylinder, becomes uniform. Compared with the case where it is provided, there is less shaft shake and the decompression characteristics are more stable.

[Brief description of drawings]

FIG. 1 is a sectional view of an automatic pressure regulating valve according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional automatic pressure regulating valve. 13 …… hot water flow path, 14 …… water flow path, 15 …… hot water valve body, 16 ……
Hot water valve seat, 17 …… Water side valve body, 18 …… Water side valve seat, 19 …… Cylinder, 20 …… Piston, 21 …… Shaft, 24 …… Guide means.

Claims (1)

[Claims] 1. A hot water flow path and a water flow path, a cylinder, a piston for partitioning the hot water flow path and the water flow path that slide in the cylinder, a valve shaft fixed to the piston, and the piston. Hot water side valve body and water side valve body for reducing the primary pressure of the hot water flow path and the water flow path, which are provided on the valve shaft so as to face each other, and a hot water side valve seat and a water side valve seat provided in the cylinder. And the wobble side of the valve shaft integrally formed on the hot water side valve body and the water side valve body, respectively, and by the flow of the hot water flow path and the water flow path, the hot water side valve body and the water side valve An automatic pressure regulating valve having screw-shaped guide means twisted in opposite directions to rotate a body and the piston in the same direction.