KR102415431B1 - High pressure control type pressure regulating valve - Google Patents

Abstract

Disclosed is a high-pressure reducing valve to prevent cavitation and impact noise caused by a large fluid pressure difference between the front and rear ends of a body. The disclosed high-pressure reducing valve comprises: a body having an inlet and an outlet and having an inner flow path to connect the inlet and outlet to allow the flow of fluid; a lower cage provided at a lower part of the inner flow path and guiding the flow of the fluid transferred to an inner lower center hole part through a circumferential surface toward the upper direction of the inner flow path; a plurality of lower pressure control units provided on the circumferential surface of the lower cage to guide the flow of the high-pressure fluid flowing through the inlet to the lower center hole part after primarily inducing pressure control; an upper cage provided in an upper part of the lower cage in the inner flow path and passing through a plurality of upper flow hole parts on the circumferential surface to guide the fluid passing through the lower cage into an upper center hole part and then discharge and guide to the outlet through the upper flow hole parts; and an upper pressure control unit which guides the discharge to the outlet after inducing the secondary pressure control of the fluid by controlling the opening amount of the upper flow hole part according to the pressure value of the fluid on the outlet side alone or the pressure value of the fluid on the inlet side and the pressure value of the fluid on the outlet side.

Description

Pressure reducing valve for high pressure {HIGH PRESSURE CONTROL TYPE PRESSURE REGULATING VALVE}

The present invention relates to a pressure reducing valve for high pressure, and more particularly, by guiding the flow of high-pressure fluid along a three-dimensional flow direction to the circumferential surface of a lower cage made of a hard or metallic material and fixed to the inside of the body, the fluid primarily After the pressure is reduced, the front end of the body is controlled by controlling the fluid flow amount (opening amount) of the upper cage located on the upper part of the lower cage based on the deviation value of the pressure on the inlet side and the outlet side of the fluid with respect to the body. It relates to a pressure reducing valve for high pressure to prevent the cavitation phenomenon and the generation of impact sound due to the large deviation of the fluid pressure at the rear end.

In general, a pressure reducing valve is used in a pressure reducing line for a marine engine generator, etc. It can reduce the pressure of the secondary side fluid to a constant pressure lower than the primary side pressure regardless of the fluctuation of the flow rate of the high pressure primary side fluid. It is a self-regulating valve. When the fluid comes out from a narrow gap to a wide place, the pressure drops, and the narrower the gap, the greater the degree of decompression. A pressure reducing valve is an application of this principle, and the pressure is reduced by passing the fluid through a wide pipe in the gap between the valve and the valve seat. The method of automatically adjusting the valve gap according to the pressure is roughly divided into a piston type and a diaphragm type.

Looking at the structure and principle of the pressure reducing valve, the pressure reducing valve is largely divided into a direct acting type and a pilot type. A direct-acting pressure reducing valve literally uses the pressure of water flowing into the valve to reduce pressure, and the pilot type is a structure that guides the operation of a large-diameter valve in a direct-acting pressure reducing valve by attaching a direct-acting pressure reducing valve to a large-diameter valve. . In particular, in the case of a pressure reducing valve for water supply, a direct acting type is used and the principle of operation is similar to that of a pressure regulator among pneumatic equipment. That is, a diaphragm, bellows, or cylinder is installed in the upper part of the secondary side of the valve, and the disk that opens and closes the valve is connected to the stem and connected to the diaphragm, bellows, or the piston inside the cylinder. In most cases, a spring is installed on such a driving part, and an adjustment screw for regulating the pressure is installed on the spring. When the adjusting screw is locked, the spring is compressed and the diaphragm is pressed, which operates the disk, so the valve is opened. At this time, when high-pressure water enters the primary side of the valve, that is, the inlet side, the disc is open, so it passes through the seat to the secondary side of the valve. If water continues to flow into the secondary side of the valve, the pressure rises gradually, so the pressure lifts the diaphragm that opens the valve disk upward. Water is not allowed to enter the secondary side. It is a pressure reducing valve that operates repeatedly on this principle. Therefore, the direct-acting pressure reducing valve can be used not only for water but also for air, gas, and oil, but it is not applicable to high-temperature fluids such as steam.

On the other hand, as a related technology, a flow and pressure control type pressure reducing valve is proposed in Korean Patent Publication No. 10-2009-0057963 (June 2009) and Korean Patent Publication No. 10-1764709 (August 2017). there is a bar

The above-described technical configuration is a background technique for helping understanding of the present invention, and does not mean a conventional technique widely known in the technical field to which the present invention pertains.

The pressure reducing valve of the existing high pressure line has a diaphragm formed on the diaphragm plate and is composed of a piston to help the disk seat move up and down. have.

Therefore, there is a need to improve it.

The present invention was devised to improve the above problems, and by guiding the flow of a high-pressure fluid along a three-dimensional flow direction to the circumferential surface of a lower cage made of a hard or metal material and fixed to the inside of the body, the fluid is primarily introduced After the pressure is reduced, the front end of the body is controlled by controlling the fluid flow amount (opening amount) of the upper cage located on the upper part of the lower cage based on the deviation value of the pressure on the inlet side and the outlet side of the fluid with respect to the body. An object of the present invention is to provide a pressure reducing valve for high pressure that is intended to prevent cavitation and impact noise due to large fluctuations in the fluid pressure at the rear end.

A pressure reducing valve for high pressure according to the present invention includes: a body having an inlet and an outlet, and having an internal flow path to connect the inlet and the outlet from the inside to allow the flow of a fluid; a lower cage provided at a lower portion of the inner passage and guiding the fluid transferred to the inner lower center hole through a circumferential surface in an upper direction of the inner passage; a lower pressure control unit provided in plurality on the circumferential surface of the lower cage to guide the flow of the high-pressure fluid flowing in through the inlet to the lower center hole after first inducing pressure control; It is provided on the upper part of the lower cage in the internal flow path, passes through a plurality of upper flow holes on the circumferential surface, flows the fluid passing through the lower cage into the upper center hole, and then discharges it to the outlet through the upper flow hole guiding upper cage; And by controlling the opening amount of the upper flow hole according to the pressure value of the outlet-side fluid alone, or the pressure value of the inlet-side fluid and the pressure value of the outlet-side fluid, the pressure of the fluid is secondarily induced to adjust the pressure Then it includes an upper pressure control unit for guiding the discharge to the outlet.

The lower cage is characterized in that it is provided by stacking a plurality of flat plate-shaped plates stacked so as to match each of the lower center hole portions.

The lower pressure control unit may include: an inflow permissible space formed to be discontinuously formed along the outer edge of the upper surface of the lower plate located at a relatively lower portion among the stacked plates to receive the fluid, and to be opened to the outside and the upper direction; an inner space portion provided on the upper side of the lower plate, one-to-one corresponding to the inlet permissible space portion, disposed non-continuously along a set trajectory, and formed to open upwardly; a discharge permissible space portion formed along the inner edge of the lower center hole portion of the lower plate to guide the fluid flowing while changing direction through the conversion flow inner space portion into the lower center hole portion; and at least two pairs of the inlet permissible space, the diverting fluid during interspace, and the permissible discharge space, arranged non-continuously along a set trajectory on the lower surface of the upper plate located relatively above the stacked plates so as to overlap each other. , and a collision permissible space for reducing kinetic energy by inducing mutual collision while guiding the flow alternately in the vertical direction.

The upper pressure control unit is axially inserted into the upper cage so as to slide while being in contact with the inner surface of the upper center hole part, and sets the opening amount of the upper flow hole part that allows the fluid flowing into the lower part of the upper cage to be discharged to plug; a stem connected to the plug and provided to the body to be reciprocally linearly reciprocated in the axial direction; and a setting unit for automatically setting an opening amount of the upper flow hole portion having a plurality of plugs.

The upper pressure control unit may include: a seat provided on the stem; And one side is elastically supported by the sheet, the other side is elastically supported inside the body, and includes an elastic support member for increasing the responsiveness of the plug blocking the upper flow hole.

The setting unit, the inlet sensor for detecting the pressure of the fluid flowing into the inlet side; an outlet sensor for detecting the pressure of the fluid discharged toward the outlet; an actuator operating to move the stem in an axial direction; and by comparing the pressure value of the fluid measured by the inlet sensor and the pressure value of the fluid measured by the outlet sensor, the opening amount of the upper flow hole through the plug so that the pressure deviation is maintained within a set value and a control unit for controlling movement of the actuator.

The body includes an outdoor air supply unit, wherein the outdoor air supply unit supplies external air when an emergency occurs due to an operation error of the upper pressure control unit and lowers the seat to prevent the fluid from flowing into the upper cage. do.

As described above, the pressure reducing valve for high pressure according to the present invention, unlike the prior art, is made of a hard or metal material and guides the high-pressure fluid along the three-dimensional flow direction to the circumferential surface of the lower cage fixed to the inside of the body. After first reducing the pressure of the fluid, the fluid is secondarily pressure regulated by controlling the fluid flow amount (opening amount) of the upper cage located on the upper part of the lower cage based on the deviation value of the inlet and outlet pressure of the fluid to the body. Accordingly, it is possible to prevent the cavitation phenomenon and the generation of impact noise due to the large difference in fluid pressure between the front end and the rear end of the body, thereby increasing the durability of the pressure reducing valve.

1 is a longitudinal cross-sectional view of a pressure reducing valve for high pressure according to an embodiment of the present invention.
2 is an enlarged longitudinal sectional view of a main part of a pressure reducing valve for high pressure according to an embodiment of the present invention.
3 is a perspective view of a lower cage having a lower pressure control unit of a pressure reducing valve for high pressure according to an embodiment of the present invention.
4 is an exploded perspective view of the laminated plate of the lower cage according to an embodiment of the present invention.
5 is a rear view of a plate of a lower cage according to an embodiment of the present invention.
6 is a rear perspective view of a pair of plates according to an embodiment of the present invention.
7 is a cutaway view of a pair of laminated plates according to an embodiment of the present invention.
8 is a cross-sectional view showing an operating state of a pressure reducing valve for high pressure according to an embodiment of the present invention.

Hereinafter, an embodiment of a pressure reducing valve for high pressure according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a longitudinal sectional view of a pressure reducing valve for high pressure according to an embodiment of the present invention, and FIG. 2 is an enlarged longitudinal sectional view of a main part of the pressure reducing valve for high pressure according to an embodiment of the present invention.

3 is a perspective view of a lower cage having a lower pressure control unit of a pressure reducing valve for high pressure according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view of the stacked plates of the lower cage according to an embodiment of the present invention.

Figure 5 is a rear view of the plate of the lower cage according to an embodiment of the present invention, Figure 6 is a rear perspective view of a pair of plates according to an embodiment of the present invention, Figure 7 is an embodiment of the present invention It is a cutaway view of a pair of laminated plates.

8 is a cross-sectional view showing an operating state of a pressure reducing valve for high pressure according to an embodiment of the present invention.

1 to 8, the pressure reducing valve for high pressure (PRESSURE REGULATING VALVE, 100) according to an embodiment of the present invention is a body 200, a lower cage 300, a lower pressure control unit 400, an upper cage ( 500) and an upper pressure control unit 600 .

The body 200 forms the outer shape of the pressure reducing valve 100 according to the present invention, and is made of a material that can withstand high pressure.

In particular, the body 200 forms an inlet 210 on one side so that a high-pressure fluid can pass, an outlet 220 on the other side, and connects the inlet 210 and the outlet 220 to flow the fluid. An internal flow path 230 is provided therein to allow At this time, the inlet 210, the internal flow path 230, and the outlet 220 are formed along a lying S (S)-shaped trajectory. Therefore, the high-pressure fluid is introduced into the body 200 through the inlet 210 , moves upward in the region of the internal flow path 230 , and then is discharged through the outlet 220 .

The lower cage 300 is fixed while being in contact with the lower bottom of the internal flow path 230 . At this time, the lower cage 300 is formed in a cylindrical shape. So, as seen in the drawings, the lower cage 300 forms a lower center hole 310 that is opened at least in the upper direction along the central axis.

In addition, the lower cage 300 is provided so that the lower side corresponding to the inner bottom surface of the internal flow path 230 is blocked, or the lower side that is opened by being in close contact with the inner bottom surface of the internal flow path 230 is naturally clogged.

Thus, the lower cage 300 is provided in the lower portion of the internal flow path 230, and guides the fluid transferred to the lower center hole 310 inside through the circumferential surface in the upper direction of the internal flow path 230 . At this time, the lower cage 300 is made of a metallic or hard material that can withstand high temperature and high pressure fluid. In addition, the lower cage 300 is fixedly bound to the body 200 corresponding to the inner surface of the internal flow path 230 by the binding member 330 . The binding member 330 may be variously applied such as a screw.

On the other hand, a plurality of lower pressure control units 400 are provided on the circumferential surface of the lower cage 300 , and after inducing the pressure control of the high-pressure fluid flowing in through the inlet 210 , the flow guides the lower center hole 310 . plays a role

Therefore, the high-pressure fluid is primarily pressure-reduced by passing through the lower pressure control unit 400 formed on the circumferential surface of the lower cage 300 .

In addition, the upper cage 500 is provided on the upper portion of the lower cage 300 in the internal flow path 230, and is formed in a cylindrical shape. So, the upper cage 500 forms an upper central hole 520 that is opened to both sides along the central axis direction. In addition, the upper cage 500 has a plurality of upper flow holes 510 through the circumferential surface corresponding to the outlet 220 .

So, the fluid flowing to the upper part of the lower cage 300 is introduced into the upper center hole 520 from the lower part of the upper cage 500 . At this time, the upper cage 500 is in a state in which the upper part is blocked by a plug 610 , which will be described later. Accordingly, the fluid that has passed through the lower cage 300 flows into the upper central hole 520 and is then guided to be discharged to the outlet 220 through the upper flow hole 510 .

In this case, the lower side of the upper cage 500 may be fixed while being in contact with the upper side of the lower cage 300 , and the lower side of the upper cage 500 may be supported by the support jaws 240 of the internal flow path 230 . For convenience, it is assumed that the lower side of the upper cage 500 is supported by the support jaw 240 . In addition, the body 200 is divided into a plurality so that the lower cage 300 and the upper cage 500 can be easily assembled therein, and the upper cage 500 is naturally an internal flow path by the assembly of the body 200 ( 230) is to be fixed within.

On the other hand, the upper pressure control unit 600 according to the pressure value of the fluid at the outlet 220 side alone, or the pressure value of the fluid at the inlet 210 side and the pressure value of the fluid at the outlet 220 side, the plurality of upper flow hole parts 510 ), by controlling the number of openings and the amount of opening, serves to guide the discharge of the fluid pressure to the outlet 220 after inducing the pressure adjustment secondary.

At this time, the diameter (d1) of the lower center hole portion 310 of the lower cage 300 is greater than the diameter (d2) of the upper center hole portion 520 of the upper cage 500 (d1 > d2) or the same (d1 = d2) can be done. At this time, the diameter d1 of the lower center hole 310 is larger than the diameter d2 of the upper center hole 520 (d1 > d2).

This is a relatively large amount of fluid remaining in the lower center hole portion 310 while moving from the lower center hole portion 310 having a relatively small diameter (d1) to the upper flow hole portion 510 having a relatively small diameter (d2). This is to stably supply the fluid to the upper center hole 520 .

On the other hand, the lower cage 300 is made of a plurality of flat plate-shaped plates 320 through which the lower center hole 310, respectively, is stacked so that each lower center hole 310 coincides with each other to have a cylindrical shape.

In addition, the lower pressure control unit 400 repeatedly switches the flow direction of the fluid supplied between the stacked plates 320 constituting the lower cage 300 in the up-down direction, that is, in the three-dimensional direction, and flows the fluid to the lower center hole part 310 . As the flow guides, it serves to reduce the velocity energy (kinetic energy) of the fluid.

That is, when the fluid passes between the stacked plates 320 , the flow direction is guided in the vertical direction (three-dimensionally), and velocity energy is lost as it flows in the direction of the lower center hole 310 .

In addition, the lower pressure control unit 400 serves to further reduce the kinetic energy of the fluid by guiding the fluid flowing in parallel from both sides on the same plane to collide at a specific position. After that, the fluid returns to a predetermined distance and repeats the process of flowing in the corresponding lower center hole 310 direction.

In particular, the lower pressure control unit 400 is composed of flow paths formed so as to instantaneously increase the flow velocity of the fluid that flows in the same plane and is guided to collide to take away the kinetic energy of the fluid as much as possible.

To this end, the lower pressure control unit 400 includes an inlet permissible space 410 , an inner space 420 during conversion flow, an outlet permissible space 430 , and a collision permissible space 440 .

For convenience, referring to FIGS. 4, 6 and 7 , the lower cage 300 shows only a pair of stacked plates 322 and 324 . Therefore, a plate positioned at a lower portion of the plates 322 and 324 shown as a pair is referred to as a lower plate 322 , and a plate positioned at an upper portion is referred to as an upper plate 324 .

At this time, the inlet permissible space 410, the diverted oil during the inner space 420 and the outlet permissible space 430 are a lower plate facing the lower side of the upper plate 324 among a pair of adjacent plates 322 ( 322) is assumed to be formed on the upper side.

And, the collision permissible space 440 is an upper plate ( 324) is assumed to be formed on the lower side.

Of course, the inlet permissible space 410, the diverted fluid inner space 420 and the discharge permissible space 430 are formed on the lower side of the upper plate 324, and the collision permissible space 440 is the lower plate ( 322) may be formed on the upper side.

In particular, the inflow permissible space 410 is discontinuously formed along the outer edge of the upper surface of the lower plate 322 positioned at a lower portion among a pair of adjacently stacked plates 322 and 324 to receive a fluid supply, and is formed to be open in the upper direction.

Therefore, each of the inflow permissible space portions 410 serves to receive fluid from the outside to the lower center hole portion 310 of the lower cage 300 . Of course, the number and size of the inlet permissible space 410 formed in each of the lower plate 322 is not limited. For convenience, the inflow permissible space 410 is illustrated as being discontinuously formed along the circumferential direction on the upper surface of the lower plate 322 .

In addition, the internal space portion 420 during the conversion flow is provided on the upper side of the lower plate 322, corresponds one-to-one to the inflow allowable space portion 410, is discontinuously disposed along a set trajectory, and is formed to open upward. .

At this time, the inner space portion 420 during the conversion flow is disposed on the upper side of each of the lower plate 322, discontinuously in the direction of the lower center hole portion 310 along the set trajectory from each of the inflow allowable space portions 410.

In addition, the inner space portion 420 during the conversion flow is formed to be opened in the upper direction toward the upper plate (324). Of course, the size, number and spacing of the inner space 420 during the conversion flow formed in each of the lower plate 322 is not limited.

In addition, the discharge allowable space portion 430 is formed along the inner edge of the lower center hole portion 310 of each of the lower plate 322, the direction is changed through the corresponding conversion flow inner space portion 420 and the fluid flowing It serves to guide the flow into the lower center hole 310 .

In other words, the discharge allowable space portion 430 is formed continuously or discontinuously along the inner edge of the lower center hole portion 310 of the lower plate 322, and the internal space portion 420 and the collision allowable space portion ( It serves to allow the fluid flowing through the 440 to be discharged to the lower center hole 310 .

That is, in a state in which the lower plate 322 and the upper plate 324 are overlapped to match, along a set trajectory, a corresponding lower center hole part 310 of the internal space 420 during the conversion flow formed in the lower plate 322 . ), the inner space 420 and the discharge permissible space 430 disposed closest to the conversion flow are connected through the permissible collision space 440 to guide the flow of the fluid. Of course, the number and size of the allowable discharge space portion 430 formed in each of the lower plate 322 is not limited. For convenience, it is assumed that the discharge allowable space portion 430 is formed discontinuously.

In addition, the collision permissible space 440 is a relative of the stacked plates 322 and 324 so as to overlap with at least two pairs of the inlet permissible space 410, the diverted flow inner space 420, and the discharge permissible space 430. It is arranged discontinuously along the set trajectory on the lower side of the upper plate 324 located on the upper side, and serves to reduce the kinetic energy by inducing mutual collision while guiding the flow alternately in the vertical direction.

At this time, in the state in which the lower plate 322 and the upper plate 324 are overlapped to coincide, the collision permissible space 440 is assumed to be disposed along the same trajectory as the opposing diverting flow inner space 420 . In particular, the collision permissible space 440 serves to take away kinetic energy by allowing the flowing fluid to collide with each other.

And, the collision permissible space 440 is overlapped with at least two pairs of the inlet permissible space 410 , the diverted flow inner space 420 , and the discharge permissible space 430 .

In other words, each of the collision permissible space portions 440 formed on the lower surface of the upper plate 324 are arranged side by side and adjacent to each other along the set trajectory. It is formed to connect the space portion 420, and is formed to connect two pairs of the conversion oil interspace portions 420 each pair arranged side by side and adjacent to each other, and a pair of conversion oil inner spaces 420 arranged side by side and adjacent to each other. It is formed so as to connect the 420 and the pair of allowable discharge space portions 430 .

Accordingly, the fluid flows from the circumferential surface of the plate 320 to the lower center hole 310 and 310 in the direction of the inflow permissible space 410, the collision permissible space 440, the transitional fluid in the inner space 420, and the collision permissible. The space part 440, the space part 420, the collision permissible space part 440 and the discharge permissible space part 430 flow in the vertical direction in the order and collide with each other.

As a result, the fluid flows in a three-dimensional direction between the pair of plates 322 and 324 to be interviewed, and kinetic energy is lost, and kinetic energy is additionally lost as they collide with each other.

In particular, the inlet permissible space 410, the diverted flow inner space 420, the discharge permissible space 430 and the collision permissible space 440 are arranged adjacently and overlap the lower center of the pair of plates 322 and 324. It is assumed that the hole portion 310 is radially arranged based on the reference.

At this time, one plate 322 or 324 forms an inlet permissible space 410, an inner space 420 and an outlet permissible space 430 on the upper side, and a collision permissible space on the lower side ( As 440 is formed, each plate 320 may be thickened to maintain strength.

In order to prevent this, each of the plates 322 and 324 forms the inlet permissible space 410 , the diverted flow inner space 420 and the discharge permissible space 430 , and a collision permissible space 440 . The position can be arranged differently.

Meanwhile, the collision permissible space unit 440 includes a guide channel 442 and a bridge channel 444 , respectively.

The guide channel 442 selectively overlaps the inlet permissible space 410, the diverted flow inner space 420 or the discharge permissible space 430, which are arranged adjacently along the set trajectory of the lower plate 322, It serves to guide the direction-changing flow. At this time, the guide channel 442, on each surface of the plate 320, the axial direction is arranged in a direction perpendicular to the tangent of the circumferential surface of each plate 320, and a plurality of them are arranged in the circumferential direction.

In other words, the guide channel 442 is radially discontinuous with respect to the lower center hole 310 on the lower surface of the upper plate 324 , and is formed in a rectangular groove shape. At this time, in a state in which the lower plate 322 and the upper plate 324 are overlapped to match, each of the guide channels 442 has one inflow permissible space portion 410 and one transitional flow inner space ( 420), is formed to connect a pair of adjacent diverting fluid interspace portions 420, and is formed to connect a pair of adjacent diverted oil intervening spaces 420 and one discharging permitted space 430 is formed to connect.

In addition, the bridge channel 444 connects the same one side of a pair of guide channels 442 disposed adjacent to each other in the circumferential direction on the upper plate 324 . Accordingly, each of the collision permissible space portions 440 may be formed in a 'Digungja' shape that is opened in the outer (peripheral) direction of the upper plate 324 .

Accordingly, the fluid introduced to one side of each of the guide channels 442 moves along the guide channels 442 and collides in the corresponding bridge channels 444 .

Thereafter, the fluid flows in a direction opposite to the flow direction and moves to the inner space 420 or the discharge permissible space 430 through the other side of each of the guide channels 442 .

On the other hand, each of the bridge channels 444 is formed to have a reduced cross-sectional area toward the center from both sides connected to the corresponding guide channel 442 in order to increase the velocity of the fluid flowing from both sides to the center for collision. (a <b, see Fig. 5)

Due to this, the fluid collides with each other in a state in which the flow velocity is increased instantaneously in the bridge channel 444 , so that the kinetic energy after the collision can be reduced as much as possible.

In particular, when the bridge channel 444 has the same cross-sectional area, each of the bridge channels 444 is moved from both sides and collided with each other, so that the corresponding pair of plates 322 and 324 may shake.

Thus, the guide channel 442 forms the collision area 443 in a relatively small cross-sectional area a in the central portion so that it is smaller than the cross-sectional area b of both sides, so that the fluid collides intensively in the collision area 443, corresponding to The plates 322 and 324 to be used can be prevented from shaking since the force can be balanced in the radial direction.

Of course, the cross-sectional area of the bridge channel 444 of which the cross-sectional area is variable is not limited.

In addition, the collision tolerance space portion 440 formed in each of the stacked plates 322 and 324 may be formed to have an increased cross-sectional area in the direction of fluid flow along the axial direction of the lower center hole portion 310 to be matched.

In addition, as the fluid flows along the direction of flow in the central axis direction of the lower central hole 310, the cross-sectional area of the collision permissible space 440 gradually increases, so that the flow rate of the fluid is reduced, thereby reducing turbulence or impact sound. .

That is, the cross-sectional area c of the guide channel 442 of the lower plate 322 is larger than the cross-sectional area d of the guide channel 442 of the upper plate 324 (c>d, see FIG. 6 ).

In addition, a pair of adjacent plates 322 and 324 is temporarily stored so that the fluid discharged through the discharge allowable space 430 is evenly discharged along the lower center hole 310, and a residual portion 450 is formed to guide overflow. can do.

The remaining part 450 is variously applicable, such as a chin protruding along the edge of the lower center hole 310 from the upper surface of the plates 322 and 324 or a recessed groove.

Accordingly, the fluid flows three-dimensionally while passing through the lower pressure control unit 400 formed between the stacked pair of lower plates 322 and the upper plate 324. energy is lost first.

In particular, the plurality of overlapping plates 320 form a matching positioning hole 332 , and the binding member 330 is inserted into the positioning hole 332 that matches from the top to the bottom of the lower cage 300 . It is then bound to the body 200 .

On the other hand, the fluid pressure-reduced while passing through the lower cage 300 is the upper cage 500 and the upper pressure control unit 600 when the difference between the front-end hydraulic pressure and the rear-end hydraulic pressure of the body 200 exceeds the set value. By the control (operation) of the pressure control unit 600, it is possible to maintain within the set value range.

To this end, the upper pressure control unit 600 includes a plug 610 , a stem 620 , a setting unit 630 , a seat 640 , and an elastic support member 650 .

The plug 610 is shaft-inserted into the upper cage 500 having a cylindrical shape so as to slide while being in contact with the inner surface of the upper center hole 520, and upper flow allowing the fluid flowing into the lower part of the upper cage 500 to be discharged. It serves to set the opening amount of the hole 510 . At this time, since the plug 610 blocks the open upper part of the upper cage 500 , the fluid is prevented from escaping to the upper part of the upper cage 500 .

In particular, the plug 610 reduces the contact area with the inner surface of the upper center hole portion 520, while increasing the sealing force through multi-stage contact with the inner surface of the upper center hole portion 520 along the moving direction. A concave groove 612 is formed to be depressed. Accordingly, the plug 610 is in close contact with the inner surface of the upper center hole portion 520 at the same time as the upper and lower sides based on the concave groove portion (612). Of course, the plug 610 is made of a material having excellent wear resistance and heat resistance.

Then, the stem 620 is inserted through the open upper portion of the body 200, is connected to the plug (610). In addition, the stem 620 is inserted into the body 200 to be movable forward and backward stably along the axial direction. Thus, the stem 620 moves the plug 610 in both directions along the axial direction inside the upper cage 500 .

On the other hand, the setting unit 630 serves to automatically set the opening amount and the opening number of the upper flow hole portion 510 formed in plurality in the upper cage 500 to which the plug 610 corresponds.

That is, the setting unit 630 includes an entrance sensor 632 , an exit sensor 634 , an actuator 636 , and a control unit 638 .

The inlet sensor 632 detects the pressure of the fluid flowing into the inlet 210 side of the body 200 in real time. At this time, the inlet sensor 632 is provided on the inside of the inlet 210 or a front end connection pipe (not shown) connected to the inlet 210 .

And, the outlet sensor 634 detects the pressure of the fluid discharged toward the outlet 220 in real time. At this time, the outlet sensor 634 is provided in the rear end connection pipe (not shown) connected to the inner side of the outlet 220 or the outlet 220.

In addition, the actuator 636 operates to move the stem 620 in the axial direction, and may be variously applied to a motor, a gear, or a cylinder.

In addition, the control unit 638 compares the pressure value of the fluid measured by the inlet sensor 632 with the pressure value of the fluid measured by the outlet sensor 634, so that the pressure deviation is maintained within a set value, the plug 610 ) to adjust the amount of opening of the upper flow hole 510 through the actuator 636 is controlled to move.

That is, when the fluid pressure value measured by the outlet sensor 634 is high compared to the pressure value of the fluid measured by the inlet sensor 632 in a state in which the fluid is introduced into the inlet 210 at a constant high pressure, the control unit 638 lowers the stem 620 slowly or by a constant value along the axial direction. Accordingly, the plug 610 is lowered slowly or by a predetermined value inside the upper cage 500, and as the opening amount of the upper flow hole 510 decreases, the amount of fluid discharged to the outlet 220 decreases. As a result, the pressure on the discharge side is reduced within a certain range.

Also, the seat 640 is fixed to the top of the stem 620 . At this time, the sheet 640 is formed in the shape of a flat plate or a pad, and is made of hard material.

In addition, one side of the elastic support member 650 is elastically supported by the seat 640 , and the other side is elastically supported inside the body 200 . Thus, the stem 620 is always subjected to a force to descend along the axial direction by the elastic support member 650 . This is to improve the responsiveness of the plug 610 moving in a direction to reduce the opening amount of the upper flow hole 510 . Of course, the elastic support member 650 can be applied in various ways.

On the other hand, the body 200 is provided with an outdoor air supply (700).

The outdoor air supply unit 700, when an emergency occurs due to an operation error of the upper pressure control unit 600, supplies the outside air into the body 200 to forcibly lower the seat 640, so that the fluid flows inside the upper cage 500. It serves to prevent entry into

At this time, the outdoor air supply unit 700 can be applied in various ways. In addition, the path through which the outdoor air supplied from the outdoor air supply unit 700 is strongly supplied to the sheet 640 is schematically illustrated.

As a result, the fluid passes through the lower cage 300 and is primarily pressure-controlled (pressure-reduced) processed by the lower pressure control unit 400 , and then passes through the upper cage 500 and secondarily by the upper pressure control unit 600 . Pressure control (reduced or increased pressure) is processed. Accordingly, the pressure of the fluid at the rear end of the body 200 is stably decompressed in a state where the pressure is not excessively high or low compared to the pressure of the front side fluid.

In particular, if the pressure of the fluid detected at the rear end of the body 200 is higher than the set value, the plug 610 is raised inside the upper cage 500 and the opening amount (opening amount) of the upper center hole 520 is increased. , the pressure of the discharge side fluid is further reduced.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and it is understood that various modifications and equivalent other embodiments are possible by those of ordinary skill in the art. will understand Therefore, the true technical protection scope of the present invention should be defined by the following claims.

100: pressure reducing valve 200: body
210: inlet 220: outlet
230: internal flow 300: lower cage
320: plate 322: lower plate
324: upper plate 400: lower pressure control unit
410: inflow allowed space portion 420: diverted flow in the space portion
430: discharge permissible space unit 440: collision permissible space unit
442: guide channel 444: bridge channel
450: residual part 500: upper cage
600: upper pressure control unit 610: plug
612: concave groove 620: stem
630: setting unit 632: entrance sensor
634: exit sensor 636: actuator
638: control unit 640: sheet
650: elastic support member 700: outside air supply unit

Claims (6)

a body having an inlet and an outlet, and having an internal flow path to connect the inlet and the outlet from the inside to allow the flow of a fluid; a lower cage provided at a lower portion of the inner passage and guiding the fluid transferred to the inner lower center hole through a circumferential surface in an upper direction of the inner passage; a lower pressure control unit provided in plurality on the circumferential surface of the lower cage to guide the flow of the high-pressure fluid flowing in through the inlet to the lower center hole after first inducing pressure control; It is provided on the upper part of the lower cage in the internal flow path, passes through a plurality of upper flow holes on the circumferential surface, flows the fluid passing through the lower cage into the upper center hole, and then discharges it to the outlet through the upper flow hole guiding upper cage; and an upper pressure control unit for guiding the discharge to the outlet after inducing the pressure of the fluid to be secondarily adjusted,
The upper pressure control unit is axially inserted into the upper cage so as to slide while being in contact with the inner surface of the upper central hole, and sets the opening amount of the upper flow hole to allow the fluid flowing into the lower part of the upper cage to be discharged to plug; a stem connected to the plug and provided to be reciprocally movable in a straight line on the body in an axial direction; and a setting unit for automatically setting the opening amount of the upper flow hole part having a plurality of the plugs,
The diameter (d1) of the lower center hole portion is formed larger than the diameter (d2) of the upper center hole portion,
The plug forms a concave groove in the circumferential surface to increase the sealing force through multi-stage contact with the inner surface of the upper central hole along the moving direction while reducing the contact area with the inner surface of the upper central hole,
The upper pressure control unit may include: a seat provided on the stem; and an elastic support member having one side elastically supported on the sheet and the other side elastically supported inside the body,
The setting unit, the inlet sensor for detecting the pressure of the fluid flowing into the inlet side; an outlet sensor for detecting the pressure of the fluid discharged toward the outlet; an actuator operable to move the stem in an axial direction; and by comparing the pressure value of the fluid measured by the inlet sensor and the pressure value of the fluid measured by the outlet sensor, the opening amount of the upper flow hole through the plug so that the pressure deviation is maintained within a set value In order to adjust the, comprising a control unit for controlling the movement of the actuator,
The body is provided with an external air supply,
When the pressure value of the fluid measured by the outlet sensor is high compared to the pressure value of the fluid measured by the inlet sensor, the control unit controls the lowering movement of the stem in the axial direction gradually or by a certain value, so that the plug is As the amount of the opening of the upper flow hole decreases, the amount of fluid discharged to the outlet decreases, and the pressure on the fluid discharge side of the body decreases within a predetermined range. and
The stem improves the responsiveness of the plug moving in a direction to reduce the opening amount of the upper flow hole as a force to always descend along the axial direction is applied by the elastic support member,
The external air supply unit, when an emergency occurs due to an operation error of the upper pressure control unit, by supplying the outside air into the body to forcibly lower the seat, characterized in that it prevents the fluid from flowing into the interior of the upper cage Pressure reducing valve for high pressure.
The method of claim 1,
The lower cage is provided by stacking a plurality of flat plate-shaped plates stacked so as to match through the lower center hole, respectively,
The lower pressure control unit may include: an inflow permissible space formed to be discontinuously formed along the outer edge of the upper surface of the lower plate located at a relatively lower portion among the stacked plates to receive the fluid, and to be opened to the outside and the upper direction;
an inner space portion provided on the upper side of the lower plate, one-to-one corresponding to the inlet permissible space portion, disposed non-continuously along a set trajectory, and formed to open upwardly;
a discharge permissible space portion formed along the inner edge of the lower center hole portion of the lower plate to guide the fluid flowing while changing direction through the conversion flow inner space portion into the lower center hole portion; and
Discontinuously arranged along a set trajectory on the lower surface of the upper plate located on the upper side of the stacked plates so as to overlap with at least two pairs of the inflow allowable space portion, the diverted oil inner space portion, and the discharge allowable space portion each, and a collision permissible space for reducing kinetic energy by inducing mutual collision while guiding the fluid flow alternately in the vertical direction.
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