JPH0648013U - Pressure reducing valve - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to provide a mental condition to a driver or the like in a living room even when the living room is nearby without resonating with noise generated when the fluid is decompressed. It is to provide a pressure reducing valve that can reduce pain. [Structure] The pressure reducing valve 24 according to the present invention comprises an inlet 6 and an outlet 7.
A valve box 5 having a valve hole 19 formed between them, a valve body 1 arranged in the valve box 5 for adjusting the flow passage area of the valve hole 19, and a valve rod 8 interposed in the valve body 1. Connected and raised / lowered, and valve element 1
4 and a cylinder 2 that accommodates the piston 4 and has a cylinder hole 3 on its side surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure reducing valve.

[0002]

[Prior art]

 The pressure reducing valve generally adjusts the flow passage area of the valve hole according to the position of the valve body with respect to the primary pressure of the fluid at the inlet side of the valve, and the secondary pressure at the outlet side of the valve.

As an example of means for adjusting the position of the valve body, a piston is connected to the valve body via a valve rod, and a primary pressure applied to an upper pressure receiving surface and a secondary pressure applied to a lower pressure receiving surface of the piston. There is a structure that balances and raises and lowers. In this case, the valve box is provided with a bleed hole for propagating the primary pressure of the fluid on the inlet side of the valve to the upper pressure-receiving surface of the piston, and the cylinder containing the piston has a bleed hole for the fluid on the outlet side of the valve. A cylinder hole is provided to propagate the secondary pressure to the lower pressure receiving surface of the piston.

An outline of a conventional pressure reducing valve will be described below with reference to FIG. In FIG. 3, the fluid flows from the inlet 6 in the valve casing 5 of the pressure reducing valve 26 through the valve hole 19 to the outlet 7 according to the fluid flow 20 shown by the arrow in the figure. The valve body 1 is inserted through the valve hole 19. By raising and lowering the valve body 1, the pressure loss of the fluid in the valve hole 19 is adjusted, and the secondary pressure at the outlet 7 is adjusted. This valve body 1 has a valve body compression spring 14 in the lower part, and is further connected to a piston 4 via a valve rod 8. Therefore, the valve body 1 is interlocked with the rise and fall of the piston 4. The piston 4 is housed in the cylinder 27. The bottom of the cylinder 27 is provided with a cylinder hole 28 for transmitting the secondary pressure of the fluid on the outlet 7 side of the pressure reducing valve 26 to the lower pressure receiving surface 23 of the piston 4. On the other hand, there is an upper pressure receiving surface 13 on the upper part of the piston 4, and the piston 4 rises and falls due to the balance between the primary pressure applied to the upper pressure receiving surface 13 and the secondary pressure applied to the lower pressure receiving surface 23 of the piston 4. The primary pressure is from the inlet 6 to the first inlet side bleed hole 9 bored in the valve box 5, the small valve 12 for adjusting the primary pressure and the second inlet side bleed hole 10 to the upper pressure receiving surface of the piston 4. Propagated to 13. The small valve 12 is in contact with the adjusting compression spring 15 via the diaphragm 18, and moves up and down due to the balance of the spring forces of the adjusting compression spring 15 and the small valve compression spring 17. At this time, the small valve 12 adjusts the pressure propagating to the upper pressure receiving surface 13 of the piston 4. The spring force of the adjusting compression spring 15 is adjusted by inserting / pulling out the adjusting screw 16 screwed into the valve box 5 and by the diaphragm 18. The diaphragm 18 adjusts the spring force by applying a resistance force to the adjusting compression spring 15 by moving up and down by receiving the secondary pressure. The secondary pressure is transmitted from the outlet 7 in the valve box 5 to the lower pressure receiving surface 25 of the diaphragm 18 via the outlet side bleed wheel 11 formed in the valve box 5.

When the primary pressure on the inlet 6 side rises in the pressure reducing valve 26 configured as described above, the upper pressure receiving from the first inlet side bleed hole 9 through the small valve 12 and the second inlet side bleed hole 10 is performed. The primary pressure is propagated to the surface 13 and pushes down the piston 4 and the valve body 1 connected to the piston 4 via the valve rod 8. The fluid passes through the valve hole 19 and flows to the outlet 7. However, when the valve body 1 is pushed down, the flow passage area of the fluid in the valve hole 19 increases and the pressure loss decreases. Next pressure rises. On the other hand, since the secondary pressure on the outlet 7 side propagates to the lower pressure receiving surface 25 of the diaphragm 18 through the outlet side bleed hole 11, the adjusting compression spring 15 that contacts the diaphragm 18 when the secondary pressure rises. Generates an upward drag force. Therefore, the pressure adjusting spring 15 and the small valve compression spring 17 maintain balance with each other by the spring force generated by the upward drag force of the diaphragm 18. At this time, the small valve 12 moves upward, and the primary pressure transmitted to the upper pressure receiving surface 13 of the piston 4 decreases. The piston 4 moves up and down by the primary pressure supplied via the small valve 12. Therefore, when the pressure propagating to the upper pressure receiving surface 13 of the piston 4 decreases, the piston 4 ascends while sucking the fluid from the cylinder hole 28 formed at the bottom of the cylinder 27, and the valve body 1 interlocks with the piston 4. Then, the valve hole 19 is moved in the closing direction. When the valve hole 19 moves in the closing direction, the flow passage area of the fluid in the valve hole 19 decreases and the pressure loss increases, so that the secondary pressure decreases. As described above, the pressure reducing valve 26 acts to prevent the secondary pressure from increasing by increasing the pressure loss of the fluid passing through the valve hole 19 by adjusting the valve body 1 in response to the increase in the primary pressure. To do. On the other hand, in the case of the decrease of the primary pressure, the action is the reverse of the action described above. Therefore, the pressure reducing valve 26 has a function of keeping the secondary pressure constant with respect to the fluctuation of the primary pressure.

[0006]

[Problems to be solved by the device]

 Generally, a pressure reducing valve installed in a power generation plant generates a large amount of noise when the pressure of a fluid is reduced by a valve hole depending on a flow rate condition. On the other hand, in the above-mentioned pressure reducing valve, the cylinder hole is bored in the bottom of the cylinder to directly receive the fluid flow. Therefore, the fluid resonates with the noise generated when the pressure is reduced in the valve hole, and when the noise is further increased and the living room is near, the noise causes mental distress to the operator etc. in the living room. There was a possibility.

The present invention has been made in view of the above conventional circumstances, and an object thereof is to prevent the fluid whose pressure is reduced in the valve hole from directly contacting the cylinder hole formed in the cylinder. To provide a low-noise pressure reducing valve that does not resonate with the noise generated when decompressing in the room and can reduce the emotional distress given to the operator in the room even when the room is nearby. It is in.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the pressure reducing valve of the present invention is characterized in that a cylinder hole is formed in the side surface of the cylinder so that the fluid pressure-reduced in the valve hole is not directly received in the cylinder hole. is there.

[0009]

[Action]

 In the pressure reducing valve having the above structure, the fluid whose pressure has been reduced in the valve hole flows without directly contacting the cylinder hole formed in the cylinder. For this reason, it is possible to reduce the psychological distress given to the operator or the like in the living room even when the living room is nearby, without resonating with the noise generated when the fluid is decompressed by the valve hole.

[0010]

【Example】

 A pressure reducing valve according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a structural diagram of a pressure reducing valve according to an embodiment of the present invention. In FIG. 1, the same parts as those in FIG. 3 are designated by the same reference numerals and the description of the structure of those parts will be omitted. In FIG. 1, a cylinder hole 3 for propagating the secondary pressure of the fluid on the outlet 7 side of the pressure reducing valve 24 to the lower pressure receiving surface 23 of the piston 4 is formed on the side surface of the cylinder 2. In the pressure reducing valve of the embodiment of the present invention having the above structure, the fluid whose pressure is reduced by the valve hole flows without directly contacting the cylinder hole 3 formed in the cylinder 2. Therefore, even if the living room is nearby, the mental distress given to the driver etc. in the living room is reduced without increasing the noise in resonance with the noise generated when the fluid is decompressed by the valve hole. be able to.

Next, the effect of the embodiment of the present invention will be specifically described with reference to FIG. FIG. 2 compares noise data in the vicinity of the pressure reducing valve when the fluid flow rate is 4.6 ton / hr between the pressure reducing valve according to the embodiment of the present invention and the conventional pressure reducing valve. Fig. 2 shows the spectrum in which the sound pressure level of noise is analyzed for each octave band center frequency of that component, and the overall sound pressure level that is comprehensively analyzed in all frequencies of the noise component. In the noise data 24a of the pressure reducing valve of the embodiment of the present invention, the sound pressure level is lower than the data 26a of the conventional pressure reducing valve in almost all frequency bands, and is 6 dB lower at the overall values 24b and 26b. ing. The lowest octave band center frequency is 1 KHz, and the sound pressure level is 28 dB lower. Therefore, according to the present invention, it is possible to significantly reduce the sound pressure level generated as compared with the conventional one.

[0012]

[Effect of device]

 As described above, in the pressure reducing valve of the present invention, the fluid decompressed in the valve hole flows directly without hitting the cylinder hole formed in the cylinder, so that noise and resonance generated when the fluid is depressurized in the valve hole It is possible to reduce the generated noise.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a pressure reducing valve according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a relationship between frequency and sound pressure level of the present invention and a conventional example.

FIG. 3 is a vertical cross-sectional view showing a conventional example of a pressure reducing valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve body 2 ... Cylinder 3 ... Cylinder hole 4 ... Piston 5 ... Valve box 6 ... Inlet 7 ... Outlet 8 ... Valve rod 9 ... First inlet side bleed hole 10 ... Second inlet side bleed hole 11 ... Outlet side Bleed hole 12 ... Small valve 13 ... Upper pressure receiving surface 15 ... Adjusting compression spring 17 ... Small valve compression spring 18 ... Diaphragm 19 ... Valve hole 23 ... Lower pressure receiving surface 24 ... Pressure reducing valve

Claims (1)

[Scope of utility model registration request] 1. A valve box having a valve hole formed between an inlet and an outlet, a valve body disposed in the valve box for adjusting a flow passage area of the valve hole, and a valve rod provided on the valve body. A piston which is connected via the inlet side fluid and the outlet side fluid to raise and lower depending on the balance between the secondary pressure of the fluid and the valve body to interlock with each other; A cylinder hole for propagating to the lower pressure receiving surface of the piston is provided on the side surface, and the valve box communicates the upper pressure receiving surface of the piston with the inlet of the valve box, and the primary pressure of the fluid is connected to the upper pressure receiving surface. A pressure reducing valve having an inlet side bleed hole for propagating pressure.