JPS61189380A - Constant flow rate valve - Google Patents

Abstract

PURPOSE:To provide a constant flow rate valve which enables the generation of noise due to a difference between an incoming pressure and an outgoing pressure to be reduced to a very low value, by providing a buffer net to the secondary side of an orifice. CONSTITUTION:A through-hole 30 is opened through rotation of a handle 7, and fluid flows through a communicating hole 23 to an outlet. High pressure fluid from an inlet passes through the through-hole 30, and is controlled into a static flow and decreased in a pressure by a strainer 12 located on the primary side of a rubber orifice 9. Besides, the rubber orifice 9 made of silicone rubber being a flexible material is bent to the outlet port side for deformation responding to a fluctuation in a pressure on the inlet port side, and this enables a proper set flow rate of fluid to flow to the outlet port. The fluid flowing through the orifice 9 is controlled into a static current and decreased in a pressure by a buffer net 13 located on the secondary side of the rubber orifice 9, and this enables the generation of noise due to a difference in a pressure between the primary side and the secondary side of fluid flowing through the communicating hole 23 of a valve body 1 to be reduced to a low value.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a constant flow valve that can adjust a flow rate to a constant level, and is an improvement on a conventional constant flow valve to suppress noise.

2. Description of the Related Art Conventional constant flow valves, as shown in Japanese Patent Publication No. 52-22450, simply consist of a flexible orifice body and a valve stem having a pointed portion fitted into a main body. When the differential pressure between the inflow and outflow sides of the pump is large, noise is generated, and it has been impossible to suppress this noise to a low level.

Problems to be Solved by the Invention The object of the present invention is to solve the above-mentioned drawbacks, and to provide a simple structure in which only a buffer net is provided on the secondary side of the ori-swiss provided in the valve body. An object of the present invention is to provide a constant flow valve capable of suppressing noise to a level lower than that of conventional valves.

Means for Solving the Problems The constant flow valve of the present invention is characterized in that the constant flow valve has an orifice made of a flexible material in the valve body, and a buffer net is provided on the secondary side of the orifice. It has the following configuration.

Function: A buffer net provided on the secondary side of the orifice provided in the valve body makes the fluid passing through the orifice static and reduces the pressure, reducing the noise caused by the difference between the inflow pressure and the outflow pressure to that of the conventional one. Keep it low in comparison.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, 1 is a valve body, in which an inlet and an outlet are formed in the same axial direction, 2 is a connecting body screwed onto the valve body 1, and 3 is a valve body adjacent to the connecting body 2. A cap main body is screwed onto the main body 1, a valve holder 4 is disposed inside the valve main body 1 and has a valve body 5 made of fluororesin, etc., and a valve holder 6 is screwed onto the connecting body 2. 4 is a supporting valve stem; 7 is a handle attached to the upper end of the valve stem 6; 8 is a rubber orifice 9 and a backup ring 10 made of a flexible material such as silicone rubber disposed inside the valve body 1; 11 is a needle screwed onto the cap body 3; 12 is removably disposed within the valve body 1 between the cap body 3 and the cartridge body 8, that is, on the primary side of the rubber orifice 9; 13 is a buff 7 net made of a wire mesh removably fitted into the through hole 32 of the valve body 1 on the secondary side of the orifice 9; The attached plug 15 is attached to the outlet of the valve body 1 through the gasket 16 and the union nut 1
Union nipple for pipe connection installed by 7, 1
8 is a gland nut that attaches the valve stem 6 to the connecting body 2 via the gland 19, 20 is a gland packing fitted to the valve stem 6, 21 is a packing washer, and V122 is an O-ring.

The valve body 1 has a communication hole 23 formed therein that communicates the inlet and the outlet, and the communication hole 23 on the inlet side has a female threaded portion 24, which is a taper thread for pipes, and the outlet side has a female threaded portion 24, which is a taper thread for pipes. A threaded portion 25 is formed on the outer periphery, the inlet and the outlet are formed in the same axial direction, a female threaded portion 26 into which the connecting body 2 is screwed is formed on the upper inlet side, and a female threaded portion 26 is formed on the upper outlet side. A fitting recess 27 into which the O-ring 22 fits and a female thread 28 into which the cap body 3 is screwed are formed adjacent to the female thread 26, and a valve seat into which the valve body 5 is engaged is formed on the internal inflow port side. 29 and a through hole 30 into which the tip of the valve holder 4 fits, and a fitting part 3 into which the cartridge main body 8 is fitted is formed on the internal outlet side.
1 and a through hole 3 into which the buffer net 13 is fitted via the stepped portion.
2 is bored.

Next, the connecting body 2 is attached to the valve body 1 near one end of the body 33.
A male threaded portion 34 is formed to be screwed into the female threaded portion 26 of the gland nut 18, a male threaded portion 36 is formed near the other end to be screwed into the female threaded portion 35 of the gland nut 18, and a female threaded portion 3 is formed inside the main body 33.
7, and a fitting part 38 which follows the female threaded part 37 and which fits the packing washer 21 and the gland packing 20 is formed.

Next, the valve stem 6 will be described. A male threaded portion 39 is formed at one end of the valve stem 6 and is screwed into the female threaded portion 37 of the connecting body 2. A rod 40 is inserted into the tip of the male threaded portion 39. A support body 41 is formed, and a valve holder 4 on which a valve body 5 is mounted is engaged with the support body 41, and a handle 7 is attached to the other end of the valve stem 6 by a set screw 43 through a square hole 42. A gland nut 18 is attached to the connecting body 2, in which a gland washer 21, a gland packing 20, and a gland 19 are fitted adjacent to each other, and has a female threaded portion 35 that is screwed into the male threaded portion 36 of the connecting body 2. is rotatably attached to the connecting body 2 by screwing it onto the connecting body 2.

Next, the cartridge main body 8 will be explained. As shown in FIG. A female threaded portion 44 to be fitted, and a backup ring I OEM adjacent to the female threaded portion 44.
A ring fitting part 45 that fits together, and the ring fitting part 45
A fitting portion 46 into which the rubber orifice 9 is fitted, an inclined portion 47 adjacent to the fitting portion 46, and an opening portion 48 adjacent to the inclined portion 47 are formed.

As shown in FIG. 3, the buffer net 13 is made of a net of metal 1, synthetic resin, etc., and has a cylindrical body 49 that fits into the through hole 32 of the valve body 1. The support portion 50 is held between the step portion 1 and the step portion 1.
is formed.

To attach the cartridge body 8 to the valve body 1, first insert the O-ring 22 into the step at the lower end of the fitting part 31 of the valve body 1, and then insert the buffer net 13 through the body 49 of the valve body 1. The support portion 5 is fitted into the hole 32.
A rubber orifice 9 made of synthetic rubber or the like and having a through hole 51 formed therein as shown in FIG.
5, the backup ring 10 having a through hole 52 formed therein as shown in FIG.
Strainer 1 having a large number of meshes 53 shown in FIG.
2 and locking the backup ring 10, the cartridge body 8 is fitted and attached to the valve body 1, and the support portion 50 of the buff 1 net 13 is connected to the stepped portion of the valve body 1 and the cartridge body. 8 and attached to the secondary side of the rubber orifice 9.

Next, the cap body 3 will be explained. As shown in FIG. 7, there is a protrusion 54 near one end into which the other end of the strainer 12 fits, and a female threaded portion 28 of the valve body 1 following the protrusion 54. A support hole 57 is formed with a male threaded portion 55 to be screwed into the support hole 57 and has a groove 56 in which the O-ring 22 is fitted.
A female threaded portion 58 is formed adjacent to the support hole 57, and a fitting portion 59 is formed adjacent to the female threaded portion 58.
The backup ring 1o attached to the cartridge main body 8 is locked by one end of the strainer 12 which is inserted into the female threaded portion 44 of the cartridge body 8.

As shown in FIG. 8, the needle 11 has a sharp needle portion 61 formed at one end of a main body 60 that is inserted into the support hole 57 of the cap main body 3 shown in FIG. A male threaded portion 63 having a mating groove 62 and screwed into the female threaded portion 58 of the cap body 3 is formed.

To attach the cap body 3 to the valve body 1, fit the O-ring 22 into the groove 56 of the cap body 3, and then insert the needle 11.
The main body 60 of the cap body 3 is inserted into the support hole 57, and the male threaded part 63 is inserted into the female threaded part 58 of the cap main body 3 through the screwdriver engagement groove 62.
After the O-ring 22 is fitted into the fitting part 59 by rotating with a screwdriver or the like, the male thread part 64 is screwed into the female thread part 58 of the cap body 3, and the fitting part 59 is screwed in.
The plug 14 is provided with a head 66 having a groove 65 that fits into the plug 14.
After screwing into the cap body 3, fit the O-ring 22 into the fitting recess 27 of the valve body 1, and screw the female thread part 28 of the valve body 1 and the male thread part 55 of the cap body 3. When this is done, the protrusion 54 of the cap body 3 is fitted to the other end of the strainer 12, and one end of the strainer 12 is brought into contact with the backup ring 10, and the strainer 12 is attached to the rubber cartridge body 8. Install it on the primary side of orifice 9.

Next, the union nipple 15 attached to the outlet of the valve body 1 has a male threaded portion 68, which is a taper thread for piping, formed at one end of the main body 67, and an engagement piece 68 at the other end.
9 is formed, and a through hole 70 communicating with the outlet of the valve body 1 is formed inside.

The union nut 17 has an opening 71 into which the main body 67 of the union nipple 15 fits from one end, and a fitting part 72 adjacent to the opening 71 into which the engagement piece 69 is fitted and locked. A female threaded portion 73 is formed adjacent to the fitting portion 72 to be screwed into the male threaded portion 25 of the valve body 1 .

Next, to attach the union nipple 15 to the valve body 1, the union nipple 15 is inserted into the union nut 17, the body 67 is fitted into the opening 71, and the engagement piece 69
is engaged with the fitting part 72, the gasket 16 is brought into contact with the outlet of the valve body 1, and the female threaded part 73 of the union nut 17 is screwed into the male threaded part 25 of the valve body 1 and tightened. This is done by

To explain the operation in the embodiment of this invention, the fluid is
By rotating the handle 7, the passage hole 30 of the valve body 1 that is closed by the valve body 5 is opened, and the flow passes through the communication hole 23 formed in the valve body 1 and flows from the inlet to the outlet. Ru.

Then, the high pressure fluid from the inlet passes through the through hole 30,
A strainer 12 provided on the primary side of the rubber orifice 9 performs static flow and depressurization, and in addition, the rubber orifice 9 made of a flexible material such as silicone rubber changes the pressure at the outlet depending on pressure fluctuations on the inlet side. Since the fluid is bent to the side, an appropriate set flow rate of fluid can flow to the outlet, and the buffer net 13 provided on the secondary side of the rubber orifice 9 makes the fluid passing through the orifice 9 static and depressurized. Noise caused by a pressure difference between the primary side and the secondary side of the fluid flowing through the communication hole 23 of the valve body 1 can be suppressed to a low level.

If the pressure difference between the fluid pressure at the inlet and the fluid pressure at the outlet is large,
Although the rubber orifice 9 is returned to the inlet side together with the fluid due to the water hammer phenomenon, the backup ring 10 prevents the rubber orifice 9 from being reversed, thereby preventing fluctuations in the set flow rate.

If the buffer net 13 becomes clogged due to water scale, dirt, etc. adhering to it due to long-term use, the cap body 3 can be removed from the valve body 1 and the cartridge body 8 fitted inside the pulp body 1 can be removed. Valve body 1
It can be easily removed from the female threaded portion 28, and the buffer net 13 can be cleaned and reused or replaced.

Furthermore, if the rubber orifice 9 has deteriorated due to long-term use, by removing the cap body 3 from the valve body 1, the cartridge body 8 that fits into the fitting part 31 formed inside the valve body 1 can be removed together with the strainer 12. Since it can be removed, only the rubber orifice 9 can be easily replaced without removing the union nipple 15 to which the piping is connected.

Incidentally, fluid leakage is reliably prevented by the gland packing 20 on the valve stem 6, the O-rings 22 on the cap body 3, the needle 11, the plug 14, and the cartridge body 8, and the gasket 16 on the union nipple 15.

Effects of the Invention Table 1 is a data table showing the noise measurement results of a constant flow valve without a buffer net and a constant flow valve of the present invention provided with a buffer net on the secondary side. /1
Differential pressure Δpkgf between the inlet and outlet sides of the m1n valve
/cm2, the flow rate and noise were measured. In the latter case for flow rate 10fL/n+in, differential pressure Δp
When Q is 5kgf/cm', the flow rate is 10°0fL/win and the noise is 4 without a buffer net.
In the present invention, when the flow rate is 10.84 t/1n, the noise is 39 phon, and there is not much change in both, but the differential pressure Δ
When p is 5;0 kof/C12, the flow rate is 10.8 Jl/sin and the noise is 6
8 phons, and in the present invention, the flow rate is 11.2j! /sin
The noise of the present invention is 46 phons, which is significantly lower than that of the one without a buffer net, from 68 phons to 46 phons.

Similarly, for the flow rate of 15fL/win, the differential pressure Δ
When p is 0.5 kof/am2, the flow rate is 14.8 Jl/sin and the noise is 4.
7 phon, and in the present invention, the flow rate is 13.51/mtn.
At 45 phon, the noise is only slightly lower than that without a buffer net, and there is not much difference.
When the differential pressure Δp is 5.0 k (lf/cm2), the flow rate is 15.8 f/min and the noise is 71 phon in the case without the buff 7 net, and in the present invention, the flow rate is 14°71/W.
The noise level is much lower than that of a 62-phone system that does not have a 7-net buffer.

When this measurement result is expressed in a graph, as shown in Figure 9,
Between the constant flow valve without a buffer net and the present invention, the flow rate is 151/1o even if it is for IO1/i+in.
In both cases, when the differential pressure Δp is small, the noise is only slightly lower after installing the buffer net, but as the differential pressure Δp increases, the flow rate increases to 10 ft/
The noise of the present invention is significantly lower in both the win type and the 151/sin type than the noise of the type without a buffer net.

Table 1 As described above, in the present invention, by providing the buff 7 net on the secondary side of the orifice, it is possible to make the fluid flowing through the orifice to the outlet side static and reduce the pressure. The noise caused by the difference between pressure and outflow pressure can be suppressed to a much lower level than conventional ones, and the structure is simple.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view of an embodiment of the present invention, Fig. 2 is a cutaway enlarged front view of the cartridge body, Fig. 3 is a cutaway enlarged front view of the buffer net, and Fig. 4 is a cutaway of the rubber orifice. FIG. 5 is an enlarged cutaway front view of the backup ring, FIG. 6 is a cutaway enlarged pressure side view of the main part of the strainer, FIG. 7 is a cutaway front view of the cap body, and FIG. A front view of the needle - FIG. 9 is a graph showing the change in flow rate and noise with respect to differential pressure. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Connecting body, 3... Cap body, 4... Valve holder, 5... Valve body, 6...
Valve stem, 7... Handle, 8... Cartridge body, 9... Rubber orifice, 10... Backup ring, 11... Needle, -12... Strainer, 13... Buffer Net, 14...Plug, 15
...Union nipple, 16...Gasket, 17
... Union nut, 18 ... Grand nut, 1
9...Grand, 20...Grand packing, 2
1...Packing washer, 22...0 ring, 23
...Communication hole, 24...Female threaded portion, 25...Male threaded portion, 26...Female threaded portion, 27...Fitting recess, 28.
... Female thread part, 29 ... Valve seat, 30 ... Through hole, 31
... Fitting part, 32 ... Through hole, 33 ... Main body, 34
... Male thread part, 35... Female thread part, 36... Male thread part, 37... Female thread part, 38... Fitting part, 39.
... Male thread part, 40 ... Rod, 41 ... Support body, 42
... Square hole, 43 ... Set screw, 44 ... Female thread part,
45... Ring fitting part, 46... Fitting part, 47.
... Inclined portion, 48... Opening, 4.9... Main body, 5
0...Support part, 51...Through hole, 52...Through hole,
53...Mesh, 54...Protrusion, 55...Male thread part, 56...Groove, 57...Support hole, 58...Female thread part, 59...Fitting part, 60...Main body, 61...
・Needle part, 62... Engagement groove for screwdriver, 63...
・Male thread part, 64...Male thread part, 65...Groove, 66
...Head, 67...Body, 68...Male thread, 6
9... Engaging piece, 70... Through hole, 71... Opening part,
72... Fitting part, 73... Female thread part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Mill

Claims (1)

[Claims] 1. A constant flow valve comprising an orifice made of a flexible material within a valve body, characterized in that a buffer net is provided on the secondary side of the orifice.