KR20130001877U - Device of fluid flow velocity and pressure drop - Google Patents

Abstract

The present invention relates to a mechanism for adjusting the pressure drop, the step of the channel is formed in a plate shape laminated on the site and the main disk through the discharge hole in the center, and formed on the same side of the main disk to discharge the fluid flowing into the edge It characterized in that it comprises a main flow path which is formed to reduce the differential pressure while flowing flow alone.
The present invention has a flow path that induces a pressure loss in the disk, unlike the prior art, to prevent the fluid from falling below the evaporation pressure to prevent the occurrence of cavitation (cavitation), and flows through one side of the disk As the path of the fluid is changed, the flow path space is gradually increased from the fluid inlet side to the outlet side of the trim, thereby inducing the velocity and pressure of the fluid to be lowered by the resistance loss.

Description

Pressure drop adjustment mechanism {DEVICE OF FLUID FLOW VELOCITY AND PRESSURE DROP}

The present invention relates to a mechanism for adjusting the pressure drop, and more particularly, a cage is provided inside the trim, and a cage having a flow path for inducing pressure loss prevents the fluid from falling below the evaporation pressure, thereby generating cavitation. It prevents, stacks the disks to form a cage, forming a narrow and long flow path on one side of the disk so that the flow path of the fluid is changed and the flow path cross-sectional area is gradually increased from the inlet to the outlet of the trim It relates to a pressure drop adjustment mechanism that can induce the fluid velocity and pressure to be lowered by the resistance loss in the process of passing through.

In general, the control valve is a means for suppressing or preventing the cause of damage to the valve, and the control valve is provided with a cage in which a plurality of flow holes are formed so that the fluid is not lowered below the vapor pressure by gradually lowering and releasing pressure in the valve through which the fluid passes, or To change the flow path.

Conventional control valve is provided with an actuator that is operated by the control unit of the valve body, it is provided with a body connected to the bottom of the valve body to form a flow passage through which the fluid flows.

And, the stem connected to the actuator, the plug is connected to the stem and conveyed up and down, formed in the through-hole in the center of the plug is conveyed, the cage is formed with a plurality of flow holes on the outside, one end of the plug is provided in the lower cage and And a valve seat in contact.

When the fluid flows into the flow passage of the body, the control valve operates the actuator to move the plug up and down by the stem to be in contact with or away from the valve seat to open and close the flow of the fluid.

The fluid passing through the plug is discharged to the outlet of the body through the flow hole of the cage depending on whether the plug is opened or closed.

Such a conventional control valve is normally operated at a maximum flow rate of the fluid, i.e., at full opening, where the difference between the inflow pressure and the outflow pressure of the fluid is relatively large.

In particular, the trim type control valve is a pressure-controlled cavitation prevention means that performs a cavitation prevention function by gradually increasing and decreasing the cross-sectional area of the fluid flow to make the final pressure drop equal to the outlet pressure. There was this.

This pressure-controlled cavitation prevention uses a method that repeats the pressure drop and some of the pressure recovery so that the final pressure is approximately equal to the low outlet pressure of the valve. This pressure drop means dissipation of fluid energy, and it is a means of preventing damage to pipes or valves by preventing the occurrence of cavitation by inducing a permanent pressure drop equal to the outlet pressure by giving a proper resistance to the fluid.

The most representative of such a pressure-controlled trim is the US patent US 4,249,574.

Another type of cavitation prevention function is the speed control type, which has a small flow cross-sectional area at the initial fluid inlet portion of the fluid flow path inside the cage, thereby gradually changing the direction of the flow path while gradually increasing the cross-sectional area during the course of each path. There was a cavitation-proof trim in the form of a complex maze flow path that induces a pressure drop so that the final pressure is approximately equal to the low outlet pressure of the valve. This structure of the anti-cavitation function is called a labyrinth trim or tortuous trim.

Conventional trim type control valve has a problem that cavitation occurs or is easy to occur due to a large pressure difference in a place where a high pressure fluid is used. Therefore, there is a need for improvement.

The present invention was devised to improve the above problems, and induces the pressure loss of the disc inside the trim for the high efficiency of the Heat Recovery Steam Generating (HRSG) system, which is being applied to produce power generation energy efficiently in the power generation system. A flow path is provided to prevent the fluid from falling below the evaporation pressure, thereby performing a cavitation prevention function, and the flow path gradually flows from the fluid inlet side to the outlet side while the path of the fluid flowing through one side of the disk is changed. It is an object of the present invention to provide a mechanism for adjusting the pressure drop, which is intended to induce the velocity and pressure of the fluid to be lowered by the resistance loss as the space is made larger.

The pressure drop adjusting mechanism according to the present invention comprises: a main disc having a plate shape stacked on a portion for flow of a fluid and having a discharge hole in the center, and formed on the same side of the main disc as an edge. A main flow path formed to reduce the differential pressure while guiding the flow of the introduced fluid into the discharge hole, wherein the main flow path comprises: a first radiation projection member protruding a plurality of radially from the center of the main disk; A first fluid constraining member for extending the circular trajectory to both sides of the member and damaging the fluid flowing to both sides of the first radiation projecting member, and radially with respect to the center of the main disk between the first radiation projecting member A plurality of second projecting projections protruding and of a shorter length than the first radiation projecting members, and opposing neighboring images; First extends in a circle locus on both sides of the second radial projection member is arranged between the fluid constrained projecting member includes a second protruding member for constraining fluid to increase the loss of the flowing fluid.

The main disk preferably forms an edge protruding member that is continuous along the edge of the discharge hole and formed lower than the first fluid constraining protruding member.

Preferably, the interval between the first fluid constraining protrusion member and the second fluid constraining protrusion member becomes wider toward the center of the main disk.

The main disk is preferably provided with an outer protruding member protruding discontinuously along the circular trajectory on the outer edge to increase the inlet speed of the fluid to reduce the pressure.

The main disk preferably has an inner protruding member which protrudes discontinuously along the circle trajectory in the inner direction of the outer protruding member and is alternately disposed with the outer protruding member.

The main disk has a sub-disk group consisting of a plurality of sub-disks are stacked on the upper side, the different sub-disk group is preferably made of a different length of the outer protrusion member and the inner protrusion member as it goes up. .

The stacked main disk and the sub disk group is preferably formed to form a pressure drop trim of the control valve.

As described above, the pressure drop adjustment mechanism according to the present invention, unlike the prior art, pressure on the disc inside the trim for high efficiency of the Heat Recovery Steam Generating (HRSG) system, which is being applied to produce power generation energy efficiently in the power generation system. A flow path that induces a loss prevents the fluid from falling below the evaporation pressure to perform a cavitation prevention function, and to change the path of the fluid flowing through one side of the disk while changing from the fluid inlet side of the trim. As the flow path space is gradually increased toward the outlet side, the velocity and pressure of the fluid can be induced to be lowered by the resistance loss.

1 is an internal view of a pressure drop adjusting mechanism according to an embodiment of the present invention.
Figure 2 is a perspective view of the trim of the pressure drop adjustment mechanism according to an embodiment of the present invention.
Figure 3 is an exploded perspective view of the trim of the pressure drop adjustment mechanism according to an embodiment of the present invention.
Figure 4 is a cross-sectional view of the main disk of the pressure drop adjustment mechanism according to an embodiment of the present invention.
5 is a cross-sectional view of a sub-disk of the pressure drop adjusting mechanism according to an embodiment of the present invention.
6 to 8 is a simulation state diagram of the pressure change and the fluid velocity according to the disk shape of the pressure drop adjustment globe valve according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the pressure drop adjustment mechanism according to the present invention. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions in the present invention, and this may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is an internal view of a pressure drop adjusting mechanism according to an embodiment of the present invention.

Figure 2 is a perspective view of the trim of the pressure drop adjustment mechanism according to an embodiment of the present invention, Figure 3 is an exploded perspective view of the trim of the pressure drop adjustment mechanism according to an embodiment of the present invention.

Figure 4 is a cross-sectional view of the main disk of the pressure drop adjustment mechanism according to an embodiment of the present invention, Figure 5 is a cross-sectional view of the sub-disk of the pressure drop adjustment mechanism according to an embodiment of the present invention.

6 to 8 is a simulation state diagram of the pressure change and the fluid velocity according to the disk shape of the pressure drop adjustment globe valve according to an embodiment of the present invention.

Referring to Figure 1, the pressure drop adjustment mechanism according to an embodiment of the present invention is used in the feed water heater (not shown) of the power plant, the valve body 10, the pressure drop trim 100, and the plug And a part 20.

The valve body 10 forms the shape of a globe valve, and forms a channel 12 that is open to both sides to guide a flow of a fluid having fluidity such as liquid or gas.

At this time, the valve body 10 is formed so as to vary the height of one side of the channel 12 corresponding to the inlet side of the fluid and the other side of the channel 12 corresponding to the outlet side of the fluid. Thus, the channel 12 is formed stepped inside the valve body 10.

That is, the channel 12 may be formed in a straight line inside the valve body 10, but is formed along the 'S' trajectory for convenience.

Of course, the valve body 10 is applicable to a variety of shapes and materials.

In addition, the pressure drop trim 100 is provided on the inside of the valve body 10 serves to regulate the flow of the fluid and regulate the flow amount.

In other words, the pressure drop trim 100 is provided at the stepped portion of the channel 12 to prevent the fluid from falling below the evaporation pressure of the fluid flowing from one side of the channel 12 to the other side.

In particular, the pressure drop trim 100 has a channel 12 of the valve body 10 in order to prevent cavitation due to the local flow speed of the micro flow opening. It acts to force the pressure down.

In addition, the plug portion 20 is provided to be lowered on the inner side of the pressure drop trim 100 to serve to interrupt the flow of fluid flowing from one side of the valve body 10 to the other side.

That is, the plug portion 20 maintains the seal in the closed state to block the flow of fluid by blocking the pressure drop trim 100 and opens the flow of fluid by opening the pressure drop trim 100. Serves to unseal from

At this time, the plug portion 20 is provided to be capable of lifting up and down inside the pressure drop trim 100 by various methods such as a cylinder.

Meanwhile, as shown in FIGS. 2 and 3, the pressure drop trim 100 includes a main disk 110 and a main flow path 120.

The main disk 110 is formed in a plate shape stacked on the stepped portion of the channel 12. Thus, the main disk 110 is composed of a plurality of stacked. At this time, each main disk 110 through the discharge hole 112 in the center. The discharge hole 112 is open to the upper and lower sides of the main disk 110 to be opened.

Thus, the fluid flows through the outer edges of the main disk 110 between the stacked main disks 110 and then falls into the stepped channel 12 through the discharge hole 112 of the main disk 110.

Accordingly, the stacked main disks 110 form the main channel 120 on the same side.

The main flow path 120 is formed to reduce the pressure difference while guiding the flow of fluid introduced into the edge of the main disk 110 to the discharge hole 112.

In particular, the main channel 120 has an outlet pressure at the inside of the main disk 110 corresponding to the fluid outlet of the main disk 110 for a given differential pressure so that the local cavitation does not occur. It is preferably formed so as to be equal to or similar to the outlet pressure at the other side, so that a sudden change in flow does not occur on the flow path of the fluid inside the main disk 110.

 For example, the main flow path 120 includes a first radiation protruding member 121, a first fluid constraining protrusion 122, a second radiation protruding member 123, and a second fluid constraining protrusion 124. .

A plurality of first radiation projection members 121 protrude radially from the center of the main disk (110). At this time, the first radiation projection member 121 is formed shorter than the radial distance from the surface of the main disk 110, is made of a straight line to guide the fluid to the discharge hole 112 as a whole. Of course, the first radiation projection member 121 may be formed in a variety of cross-section, it may be provided detachably on the main disk 110, but is preferably formed integrally on the main disk (110). In addition, the first radiation projection member 121 is not limited to the number.

In addition, the first fluid constraining protrusion 122 extends along the circular trajectory to both sides of the first radiation protruding member 121. Thus, the first fluid constraining protruding member 122 is introduced into the stacked main disk 110 to impart resistance to the fluid to be flowed linearly and the fluid to be flowed linearly by the first radiation protruding member 121. It acts to inflict losses. That is, the fluid attenuates energy such as pressure and kinetic energy held by the first fluid constraining protruding member 122 with a loss of resistance to reduce the differential pressure, thereby preventing the cavitation phenomenon.

In this case, the first fluid constraining protruding member 122 may be variously formed in cross section, and may be detachably provided on the main disk 110, but may be integrally formed on the main disk 110. In addition, the first fluid constraining protrusion member 122 is not limited to the number.

In addition, the second radiation projection member 123 is disposed between the first radiation projection member 121. In addition, a plurality of second radiation protruding members 123 protrude radially with respect to the center of the main disk 110. In addition, the second radiation projection member 123 has a shorter length than the first radiation projection member 121.

At this time, the second radiation projection member 123 is formed in a straight line to guide the fluid to the discharge hole 112 as a whole. Of course, the second radiation projection member 123 may be formed in a variety of cross-section, it may be provided detachably on the main disk 110, but is preferably formed integrally on the main disk (110). In addition, the second radiation projection member 123 is not limited to the number.

On the other hand, the second fluid constraining protruding member 124 extends along the circular trajectory to both sides of the second radiating protruding member 123. Thus, the second fluid constraining protruding member 124 is introduced into the stacked main disk 110 to impart resistance to the fluid to be flowed linearly and the fluid to be flowed linearly by the second radiation protruding member 123. It acts to inflict losses. That is, the fluid attenuates energy such as pressure and kinetic energy held by the second fluid constraining protruding member 124 with a loss of resistance, thereby reducing the differential pressure, thereby preventing the cavitation phenomenon.

In particular, the second fluid constraining member 124 is located between the first fluid constraining member 122 which opposes adjacently, that is, neighbors in the radial direction.

Accordingly, the fluid flows in the zigzag direction along the first fluid constraining protrusion 122 and the second fluid constraining protrusion 124 and loses energy due to the resistance loss.

Of course, the second fluid constraining protruding member 124 may be formed in a variety of cross-sections, it may be provided detachably to the main disk 110, but is preferably integrally formed on the main disk 110. In addition, the second fluid constraining protrusion member 124 is not limited to the number.

On the other hand, when the fluid flows locally between the first fluid constraining member 122 and the second fluid constraining member 124 of the entire one side of the main disk 110, the resistance of the fluid throughout the main disk (110) The deviation becomes large. As a result, the durability of the main disk 110 is lowered.

Accordingly, the main disk 110 forms an edge protruding member 125 that is continuous along the edge of the discharge hole 112 and formed lower than the first fluid constraining protruding member 122.

That is, as shown in FIG. 4, the fluid flowing between the first fluid constraining member 122 and the second fluid constraining member 124 is the first fluid constraining member 122 or the second fluid constraining member 124. By being temporarily gathered on the surface of the main disk 110 by the edge protruding member 125 lower than the height of the discharge hole 112 is uniformly discharged as a whole.

The fluid flowing in a zigzag shape through the first fluid constraining protrusion 122 and the second fluid constraining protrusion 124 gradually loses velocity energy as it flows toward the discharge hole 112 of the main disk 110. desirable.

For example, an interval between the first fluid constraining protrusion 122 and the second fluid constraining protrusion 124 with respect to the radial direction of the main disc 110 may be wider toward the center of the main disc 110. Do.

The main disk 110 has an outer protruding member 126 that protrudes discontinuously along the circular trajectory at the outer edge to increase the inflow speed of the fluid to reduce the pressure.

That is, the fluid is introduced through the channel 12 of the valve body 10 and then the speed increases as it passes between the narrow outer protruding member 126, thereby lowering the pressure.

The space between the outer protruding members 126 of the stacked main disks 110 is narrower than one side of the channel 12.

Of course, the outer protruding member 126 may be formed in a variety of cross-section, it may be provided detachably to the main disk 110, but is preferably formed integrally with the main disk 110. In addition, the outer protrusion member 126 is not limited to the number.

In particular, the outer protruding member 126 has a relatively long length or a large number so as to reduce an interval of the outer protruding member 126 so as to correspond to a high differential pressure generated at the initial opening of the channel 12.

In addition, the main disk 110 includes an inner protrusion member 127 that protrudes discontinuously along the circular trajectory in the inner direction of the outer protrusion member 126 and is alternately disposed with the outer protrusion member 126.

Accordingly, the fluid flowing into the main disk 110 through the outer protruding members 126 hits the inner protruding member 127 and changes the flow direction. Thus, the fluid generates energy loss. The fluid having changed the flow direction is further lost energy while flowing in the direction of the discharge hole 112 between the first fluid constraining protrusion 122 and the second fluid constraining protrusion 124, the pressure drop trim 100 ), The differential pressure between the fluid inlet side and the fluid outlet side is not large.

In particular, the stacked main disks 110 are preferably bound to each other. This is because when the main disks 110 stacked by the inflowing fluid are freed, it is difficult to control the inflow of the fluid and there is a risk of damage.

Thus, the first radiation projection member 121, the first fluid constraining member 122, the second radiation constraining member 123, and the second fluid constraining projection member 124 of any one of the main disks 110 stacked and in contact with each other. ), One or some or all of the edge protruding member 125, the outer protruding member 126, and the inner protruding member 127 are in contact with the other side of the other main disk 110, By joining by melting, the adjacent main disk 110 is preferably formed integrally.

In particular, the main disk 110 and the main disk 110 are integrated by welding means such as brazing without using a fastening mechanism such as a mechanical screw, so that when the existing joint surface is large, the filler is generated during the brazing process. It is possible to prevent the case that the joint surface is not in close contact with the gas discharge is not smooth.

On the other hand, as the opening amount of the channel 12 increases as the plug portion 20 rises, the amount of loss of pressure and velocity of the fluid can be reduced.

Accordingly, the main disk 110 is provided with a sub disk group 130 consisting of a plurality of sub disks stacked on the upper side. That is, a plurality of sub disc groups 130 are provided. For convenience, the sub disk group 130 is illustrated as being composed of a first sub disk group 132 and a second sub disk group 134.

The first sub disk group 132 stacks a plurality of first sub disks 133, and the second sub disk group 134 stacks a plurality of second sub disks 135.

In this case, the number of first sub disks 133 and the number of second sub disks 135 are not limited.

3 and 5, the first sub disk group 132 is stacked on the upper side of the main disk 110, and the second sub disk group 134 is stacked on the upper side of the first sub disk group 132.

In addition, the main disk 110 provides a high pressure to the fluid flowing in the initial opening, the first sub disk 133 and the second sub disk 135 is gradually opened while providing a low pressure to the fluid gradually. .

In addition, the first sub disk 133 and the second sub disk 135, like the main disk 110, the discharge hole 112, the main flow path 120, the first radiation projection member 121, the first And a fluid constraining protrusion 122, a second radial protrusion protrusion 123, a second fluid constraining protrusion 124, an edge protrusion member 125, an outer protrusion member 126, and an inner protrusion member 127. do.

Therefore, the main disk 110, the first sub disk 133 and the second sub disk 135 is formed in a slightly different shape to reduce the differential pressure of the fluid discharged to each discharge hole 112.

That is, the main flow path 120 of the main disk 110, the first radiation projection member 121, the first fluid projection projection member 122, the second radiation projection member 123, the second fluid projection projection member 124 ), The edge protruding member 125, the outer protruding member 126, and the inner protruding member 127 are the main flow path 120, the first radial protruding member 121, and the first fluid of the first sub disk 133. More densely than the constrained protrusion member 122, the second radial protrusion member 123, the second fluid constrained protrusion member 124, the edge protrusion member 125, the outer protrusion member 126, and the inner protrusion member 127. Disposed or large or elongated.

Similarly, the main flow path 120 of the first sub disk 133, the first radiation projection member 121, the first fluid constraining projection member 122, the second radiation projection member 123, the second fluid constraining projection member 124, the edge protruding member 125, the outer protruding member 126, and the inner protruding member 127 are formed on the main flow path 120, the first radiating protruding member 121, and the second sub disk 135. Than the first fluid constraining protruding member 122, the second radiation protruding member 123, the second fluid constraining protruding member 124, the edge protruding member 125, the outer protruding member 126, and the inner protruding member 127. It is densely arranged, large or long.

In this case, the number of first sub disks 133 of the first sub disk group 132 and the number of second sub disks 135 of the second sub disk group 134 are not limited.

In addition, the discharge holes 112, the main flow paths 120, the first radiation protruding members 121, and the first fluid constitutions of the main disk 110, the first sub disk 133, and the second sub disk 135, respectively. The protruding member 122, the second radial protruding member 123, the second fluid constraining protruding member 124, the edge protruding member 125, the outer protruding member 126, and the inner protruding member 127 have the same function. Therefore, the same reference numerals are given.

The reason why the pressure drop adjusting mechanism according to the present invention stacks the main disk 110, the first sub disk 133, and the second sub disk 135 with different fluid flow patterns in an upward direction is to move along the inner surface of the cage. As the plug portion 20 which gradually adjusts the flow amount of the fluid flows up, the pressure drop trim 100 close to the flow rate characteristics having a flow rate increase rate (EQ%) having a flow rate change almost equal to the flow rate% is obtained. To provide.

Of course, the main disk 110, the first sub disk 133 and the second sub disk 135 may be formed in the same manner.

Accordingly, the main disk 110 is divided into 12 to form a main flow path 120, and the main flow path 120 is configured to appear repeatedly along the circumference.

The flow path pattern by the main flow path 120 has a fluid inlet between the outer protruding members 126, and is composed of two inlets and two inlets of a cavity divided into two adjacent inlets and a neighboring pattern by the inner protruding members 127. The inlet is formed to have a protruding portion in the form of a circumferential band having a wall perpendicular to the inlet, and has three flow paths. The configuration is repeated along the flow path, but the first radiation protruding member 121 and the first fluid restraint are configured. A change in the flow direction of the fluid introduced by the protruding member 122, the second radial protruding member 123, and the second fluid constraining protruding member 124 is changed almost vertically, finally exceeding the edge protruding member 125. The discharge hole 112 is evenly discharged.

The first sub disk 133 is divided into 12 parts to form a main flow path 120, and the main flow path 120 is configured to appear repeatedly along the circumference.

The flow path pattern by the main flow path 120 has a fluid inlet in the outer circumference, and forms an outer protruding member 126 composed of three inlets and two inlets of a cavity divided into a neighboring pattern in the center. It constitutes an inner protruding member 127 arranged discontinuously along a plurality of circular trajectories configured to have a protruding portion in the form of a circumferential band having a vertical wall and having four flow paths, and this configuration is repeated along the flow path. The first radiation protruding member 121, the first fluid constraining protrusion 122, the second radiation protruding member 123, and the second fluid constraining protrusion 124 having different shapes from those of the main disk 110. It is configured to have 13 places where the change in the flow direction of the introduced fluid is changed almost vertically, and finally discharges the fluid to the discharge hole 112 along the edge protrusion member 125.

In addition, the second sub disk 135 is divided into 12 parts to form a main flow path 120, and the main flow path 120 is configured to appear repeatedly along the circumference.

The flow path pattern by the main flow path 120 has a fluid inlet in the outer circumference, and forms an outer protruding member 126 composed of three inlets and two inlets of a cavity divided into a neighboring pattern in the center. It constitutes an inner protruding member 127 arranged discontinuously along a plurality of circular trajectories configured to have a protruding portion in the form of a circumferential band having a vertical wall and having four flow paths, and this configuration is repeated along the flow path. The first radiation protruding member 121, the first fluid constraining protrusion 122, the second radiation protruding member 123, and the second fluid constraining protrusion 124 having different shapes from those of the main disk 110. It is configured to have 13 places where the change in the flow direction of the introduced fluid is changed almost vertically, and finally discharges the fluid to the discharge hole 112 along the edge protrusion member 125.

In the flow path of the fluid forming such a fluid flow path, in order to configure so that local cavitation does not occur, the outlet pressure at the inner surface of the disks 110, 133, 135, which are the fluid outlets of the disks 110, 133, 135, for a given differential pressure is equal to the outlet pressure of the valve. It should be at an equivalent level, and it is desirable to ensure that no abrupt flow changes occur on the flow path of the fluid inside the discs 110, 133, 135.

In order to obtain these results, it is desirable to design the flow path of the fluid in consideration of the design and confirm it by the fluid analysis method.

Therefore, the present invention can be viewed as a kind of pattern selected by designing the flow path of the various fluids and implementing the fluid analysis method.

The flow path patterns of the fluids of the discs 110, 133, and 135 are of three types, and are distinguished by differences according to the loss of the flow path.

The pressure drop adjusting mechanism according to the present invention is characterized by configuring a plurality of patterns of a plurality of flow paths, and configuring each pattern of a plurality of flow paths.

In the present design, the difference according to the loss of several flow paths is determined by combining the pressure loss and flow coefficient characteristics of the disks 110, 133, and 135 according to the pattern of one flow path. This is because it is possible to obtain data on the flow characteristics and the maximum possible flow coefficient according to the application range of the regulating device, that is, the applied differential pressure and the working distance (Lift%) of the flow regulating device.

The disks 110, 133, and 135 on which the patterns of the flow paths are formed have a feature of combining the patterns of the plurality of flow paths, respectively. The reason for this feature is that as the plug portion 20 for adjusting the amount of flow of fluid moving along the inner surface of the cage rises on the seat surface, the amount of change in flow rate can be configured to have various flow rate characteristics. to be.

Among these embodiments, an example having linear characteristics and EQ% flow characteristics will be described as an example.

The control mechanism of the fluid velocity and pressure drop formed by using only the main disk 110 has a plug portion 20 for adjusting the flow of fluid because each disk 110 has the same pressure loss and flow coefficient characteristics. As the sheet surface rises, the amount of change in the flow rate becomes constant and thus has linear characteristics. In addition, the maximum flow coefficient is achieved by matching the sum of the number of disks having a constant pressure loss and flow coefficient characteristics, and the length of the stacking disks 110 and the length of the plug portion 20 is moved to the maximum. For reference, in detail, the sub discs 133 and 135 may be formed in a pattern of a fluid flow path having a pressure loss smaller than that of the fluid flow path of the main disk 110 and having a flow coefficient value that is slightly larger than the pattern of the fluid flow path. In this case, the number of disks 133 and 135 necessary for calculating the maximum flow coefficient value and the length of the plug unit 20 to move to the maximum are reduced. However, the pressure loss is reduced and must be applied to conditions used at slightly lower pressures. That is, where the conditions of occurrence of cavitation are lower.

Therefore, the type selection of the disks 110, 133, 135 is preferably selected according to a given condition or used condition, and accordingly, the length of the plug portion 20 that adjusts the amount of fluid flow required is determined to the maximum.

Next, an example of implementing the EQ% flow rate characteristics using three disks 110, 133, and 135 will be described. The EQ% flow rate characteristic is that the rate of change of the flow rate is constant with respect to the flow rate% as the plug portion 20 rises at the seat surface. It is a characteristic that increases functionally. However, in order to increase equally with the increase rate, a pattern of each of the disks 110, 133, 135 having a flow rate increase rate for each lift% is required, so that the number of patterns of the disks 110, 133, 135 having a large number of pressure loss and flow coefficient characteristics can be obtained. It is practically impossible because it is needed. For this reason, the actual EQ% flow characteristics can be divided into several zones and stacked in groups to approximate the theoretical EQ% flow characteristics.

The patterns of the flow paths of the fluids of the disks 110, 133, and 135 are composed of A, B, and C types, and are distinguished by differences according to the loss of the flow paths. Here, the pattern A of the flow path of the fluid has the largest flow loss and the smallest flow coefficient value, the pattern B of the flow path of the fluid corresponds to the middle, and the pattern C of the flow path of the fluid has the smallest flow loss and the flow coefficient value. Select this big one.

The disk 110 of the pattern A of the flow path of the predetermined number of fluids is stacked closest to the sheet surface, and the disk 133 of the pattern B of the flow path of the fluid is stacked a predetermined number of times, and the upper portion of the flow path of the fluid A certain number of disks 135 of the pattern C are stacked. The total flow coefficient, which is the sum of the flow coefficients of each of the discs 110, 133, and 135, determines the quantity of the discs 110, 133, and 135 so as to approximate the required maximum flow coefficient. The fluid speed and pressure drop control mechanism provided as described above has a flow rate increase rate divided into three sections. In other words, it shows the lowest flow rate increase in the lowest open section, the middle part shows the rate of medium flow increase, and the highest flow rate increases in the upper part, that is, the highest Lift%. do.

   In the above embodiment, the fluid speed and pressure drop adjusting mechanism adjusts the flow rate as the plug portion 20 is raised and lowered (Lift), and is in close contact with the seat (seating the flow of the fluid), the valve body It is provided in 10 and comprises the internal component parts of a valve.

Meanwhile, FIG. 6 is a diagram illustrating a pressure distribution and a fluid velocity in color distribution when a fluid flows through the main channel 120 of the main disk 110, and FIG. 7 is a main channel 120 of the first sub disk 133. FIG. 8 is a diagram illustrating a color distribution of pressure change and fluid velocity during flow of a fluid through FIG. It is a figure shown.

6 to 8, when the fluid flows inward from the edges of the discs 110, 133, and 135, the differential pressure between the inlet and outlet sides is reduced, and the speed is gradually decreased.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand. Therefore, the true technical protection scope of this invention should be determined by the following utility model registration claim range.

10: valve body 12: channel
200: plug portion 100: pressure drop trim
110: main disk 112: discharge hole
120: main euro 121: first radiation projection member
122: first fluid constraining projection member 123: second radiation projection member
124: second fluid constraining projection member 125: edge projection member
126: outer protrusion member 127: inner protrusion member
130: sub-disk group 132: first sub-disk group
133: first sub disk 134: second sub disk group
135: second sub disk

Claims (7)

A main disk made of a plate shape stacked in the channel for fluid flow and having a discharge hole in the center thereof; And
A main flow channel formed on the same side of the main disk and formed to reduce a differential pressure while guiding a fluid flowing into the edge into the discharge hole;
The main flow path,
A first radial projection member projecting a plurality of radially from the center of the main disk;
A first fluid constraining protruding member extending along a circular trajectory to both sides of the first radiating protruding member to inflict losses on the fluid flowing to both sides of the first radiating protruding member;
A second radial projection member projecting radially with respect to the center of the main disk between the first radiation projection members, the second radiation projection member having a length shorter than that of the first radiation projection member; And
And a second fluid constraining member for increasing a loss of fluid flowing along the circular trajectory to both sides of the second radiation protruding member so as to be located between the first adjacent fluid constraining members that oppose each other. Pressure drop adjustment mechanism.
The method of claim 1,
The main disk is a pressure drop adjustment mechanism, characterized in that for forming along the edge of the discharge hole and the edge protruding member formed lower than the first fluid constraining projection member.
The method of claim 1,
The first fluid constraining projection member and the second fluid constraining member, the interval between the pressure drop adjustment mechanism, characterized in that is arranged wider toward the center direction of the main disk.
The method of claim 1,
The main disk is a pressure drop adjustment mechanism characterized in that it has an outer protruding member protruding discontinuously along the circular trajectory on the outer edge to increase the inlet speed of the fluid to reduce the pressure.
5. The method of claim 4,
And the main disk has an inner protrusion member protruding discontinuously along a circular trajectory in an inner direction of the outer protrusion member and interposed with the outer protrusion member.
The method of claim 1,
The main disk has a sub disk group consisting of a plurality of sub disks stacked on the upper side;
The sub-disk group different from each other, the pressure drop adjustment mechanism, characterized in that the length of the outer projection member and the inner projection member is different as the upward.
The method according to claim 6,
The stacked main disk and the sub-disk group is a pressure drop adjusting mechanism, characterized in that forming a pressure drop trim of the control valve.

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