KR200175254Y1 - Check valve for reducing water hammer - Google Patents

Abstract

The present invention relates to a water hammer buffered check valve, wherein the upper part of the main body forming the outer shape of the check valve having one end of the large diameter and the other end of the small diameter and open at both ends and the large diameter side of the lower part of the main body formed opposite thereto are interviewed and fixed to each other. Interposed therebetween, the center has a disk-shaped valve seat base having an inner diameter corresponding to the small diameter; A valve seat in which a truncated cone shape having a piston protruded downward is mounted on the upper surface of the inner diameter of the valve seat base so as to move up and down and has a downwardly projected piston; The piston is formed in a cylindrical shape having a diameter corresponding to that of the drawer and the opposite end is formed with a very small funnel-shaped outlet and constituted by a cylinder fixed to the center of the lower part of the body by a '<' shaped support. It is to prevent the occurrence of water hammer due to sudden fluid shutoff by slightly lengthening the closing time of the check valve as the fluid (water) flows back as soon as the pump stops.

Description

CHECK VALVE FOR REDUCING WATER HAMMER}

The present invention relates to a water hammer buffered check valve, and more particularly, a water hammer to prevent the occurrence of water hammer due to a sudden fluid shutoff by slightly lengthening the closing time of the check valve as the fluid (water) flows backward when the pump is stopped. It relates to a buffer check valve.

Generally, WATER HAMMER means that when the fluid (water) flowing inside the pipe is suddenly shut off by a valve or damper, the kinetic energy of the fluid is converted into impact energy (pressure), and the pipe speed is reciprocated several times, and related equipment (piping, Impacts on valves, etc.), especially in high capacity high lift pumps.

Usually, a check valve, which is a non-return check valve that is rotated by a hinge, is installed in the discharge-side pipe of the pump to prevent the back flow of the fluid.

These check valves are installed to shut off the back flow of the fluid without any resistance by the flow of the back flow at the moment the pump is stopped, so that the kinetic energy of the fluid is converted into instantaneous impact energy, the check valve itself and the pump, expansion pipe This can cause severe damage to related equipment such as pipelines and pipelines.

That is, as shown in Figure 1, the discharge side of the pump 1 and the discharge line 7 is connected between the check valve body 6 with a built-in expansion tube 2 and the check valve 5 therebetween If the pump 1 in operation is stopped, the discharge side fluid suddenly flows back and the check valve 5 is operated to prevent this.

At this time, the check valve main body 6 and peripheral devices such as the pump 1, the expansion pipe 2, the discharge line 7 and the means for fixing them are damaged or shortened by life due to the water hammer. It causes problems.

In addition, when the discharge side height is low, sometimes the check valve 5 does not close because the back flow speed of the fluid is lowered when the pump 1 stops, thus preventing the back flow prevention function.

In addition, since the surface of the locking jaw 3 and the check valve 5 formed on the check valve body 6 is flat, if foreign matter gets caught, the check valve 5 is not completely closed despite the closing of the check valve 5, so that the backflow Function may be degraded.

In addition, a problem of malfunction occurs because the hinge 4 rotatably supporting the check valve 5 is corroded or the foreign matter is continuously caught.

The present invention was devised to solve the above problems, and the cylinder seat and the piston are installed inside the check valve, and when the pumped fluid flows back when the pump stops, the valve seat and the piston descend and come into contact with the valve seat base. The purpose of the present invention is to provide a water-buffered check valve that eliminates water hammer by preventing the valve seat from descending rapidly due to the resistance generated when the piston pushes the fluid filled inside the cylinder while the back flow of the fluid is stopped. It is done.

In addition, the present invention, by configuring the check valve in the lifting and lowering operation by the cylinder and the piston rather than the rotation method such as the hinge means, eliminating the problem that the check valve is inoperable due to foreign matter caught, as well as low discharge line, low pressure is generated Even if the check valve is always operated.

This object of the present invention is interposed between the large diameter side of the main body forming the outline of the check valve having one end of the large diameter and the other end of the small diameter and open at both ends and the large diameter side of the lower body formed opposite to each other, the center of the center The disk seat has a disk-shaped valve seat having an inner diameter corresponding to the small diameter; A valve seat in which a truncated cone shape having a piston protruded downward is mounted on the upper surface of the inner diameter of the valve seat base so as to move up and down and has a downwardly projected piston; The piston is formed in a cylindrical shape having a diameter corresponding to that of the drawer, and at its opposite end, a very small funnel-shaped outlet is formed, and is composed of a cylinder fixed to the lower center of the body by a '<' shaped support. Is achieved.

1 is a cross-sectional view showing the installation state and operation of the check valve according to the prior art,

Figure 2 is a cross-sectional view and an exploded perspective view showing an installation state of the water hammer buffer check valve according to the present invention,

Figure 3 is an operating state of the water hammer buffer check valve according to the present invention.

Explanation of symbols on the main parts of the drawings

1 pump, 2 expansion tube,

10a: upper body, 10b: lower body,

12: support plate, 16: guide plate,

20: valve seat base, 30: valve seat,

32: piston, 34: cylinder,

35: outlet, 36: support stand.

Hereinafter, a preferred embodiment according to the present invention will be described in more detail along the accompanying drawings.

Figure 2 is a cross-sectional view and an exploded perspective view showing an installation state of the water hammer buffer check valve according to the present invention.

According to the illustrated figure, the check valve of the present invention has a main body upper portion 10a and a lower body portion 10b formed corresponding thereto, and a valve seat base 20 interposed between the upper and lower portions 10a and 10b. And a valve seat 30 fixed to the valve seat base 20 and installed to move up and down, and a piston 32 and a cylinder 34 connected to and interlocked with the valve seat 30. do.

The upper body portion 10a is a housing which is an outer shape of the check valve, and is formed in a cylindrical shape with both sides open to allow fluid to flow through.

In particular, one side, as shown, the lower surface has a large diameter, the upper surface is the opposite surface is formed to have a small diameter.

In addition, flanges 14a and 14b for connecting to pipes are formed on the outer circumference of each open surface.

The lower body 10b has the same shape and size as the upper body 10a but is formed to face each other.

Thus, after the large diameter flanges 14a are interviewed with each other and bolted together, they form a main body of the check valve.

Valve seat base 20 has an outer diameter of the same size as the diameter of the large diameter side flange (14a) of the upper body, the lower portion (10a, 10b), the inner diameter of the upper body of the lower portion (10a, 10b) It is preferable that it is formed in disk shape corresponding to the passage.

In addition, the valve seat base 20 is interposed between the lower portion (10a, 10b) on the main body is to be bolted to each other.

Accordingly, the upper and lower parts 10a and 10b form a cross-sectional shape partitioned by the valve seat base 20.

The valve seat 30 is placed on the upper side of the valve seat base 20 to open or close the inner diameter of the valve seat base 20 according to the lifting and lowering operation.

To this end, the valve seat 30 is formed in a shape in which the truncated cone-shaped member is inverted, so that the upper portion of the large diameter is located inside the upper body portion (10a) of the upper portion and the lower body portion of the lower diameter is lower To be positioned inside 10b.

In addition, a downwardly extending cylindrical piston 32 protrudes from the center of the truncated surface of the valve seat 30.

In addition, the guide plate 16 for guiding the upper outer circumference of the valve seat 30 and allowing the valve seat 30 to move up and down smoothly is provided separately, and the guide plate 16 is approximately 'a. It has a shape and is fixed to the upper surface of the valve seat base 20.

That is, the bottom surface of the valve seat 30 is fixed to the valve seat base 20 and at the same time one side surface is fixed to be interviewed on the inner peripheral surface of the upper body portion (10a).

The valve seat 30 is preferably 180 ° along the periphery of the valve seat base 20 and the main body upper part 20a, and two, particularly preferably 90 °, are provided four.

The cylinder 34 has an inner diameter of a size corresponding to the outer diameter of the piston 32, and the upper and lower surfaces thereof are formed in an open funnel shape, and in particular, the lower surface opposite to the upper surface into which the piston 32 is inserted is It is formed to have a discharge port 35 significantly smaller than the open diameter of the upper surface.

The cylinder 34 is installed at the center of the lower body 10b, and a separate support 36 is provided for this purpose.

The support 36 is a member of a substantially '<' shape, the bent portion is fixed to the outer peripheral portion of the cylinder 34 by means such as welding, and both ends thereof are the valve seat base 20 and the lower body 10b, respectively. ) Is fixed to the inner circumferential surface, for example, the upper side of both ends is fixed to the lower surface of the valve seat base 20 by means such as welding, and the lower side is on the support piece 12 installed on the inner circumferential surface of the lower body 10b. It is installed in a shape that is mounted on it, so if you have a problem and want to repair it, it is very easy to separate.

For example, when the upper and lower parts 10a and 10b and the valve seat base 20 are separated during the repair work, the cylinder 34 and the support 36 welded to the valve seat base 20 can be separated at the same time. It will provide very easy dismantling.

The support 36 is preferably provided with two 180 degrees, particularly preferably four 90 degrees.

The supporting piece 12 is like a stone piece so that the support 36 does not slip on the inner circumferential surface of the lower part of the main body 10b and keeps its locking state firmly.

At this time, the cylinder 34 is preferably installed at one position to maintain the engagement state with the piston 32, but the center of the mutual position is located on the same straight line so that the cylinder 32 when the lifting operation of the piston 32 accurately It is not necessary for the piston 32 to remain engaged in the cylinder 34 if it is to be inserted into 34.

Operation of the water hammer buffer check valve according to the present invention made in this configuration will be described according to the operating state diagram of FIG.

The pump 1 is actuated and flows through the expansion and contraction pipe 2, and the fluid flowing into the lower body 10b side pushes up the valve seat 30 closing the inner diameter of the valve seat base 20 by the pressure. It exits and flows through the body upper portion 10a to the discharge line.

In the process of supplying the fluid, some of the fluid is introduced into the cylinder 34 through the outlet 35 of the cylinder 34 to be filled, and the piston 32 is pushed adjacent to the uppermost side of the cylinder 34. State is maintained.

In this case, when the pump 1 stops, the flowing fluid flows back to impart an impact on the upper surface of the valve seat 30 with a strong pressure momentarily, and thus the valve seat 30 starts an instant descending operation. Done.

At the same time, the piston 32 interlocked with the valve seat 30 is lowered while flowing into the cylinder 34 while suddenly discharging the fluid filled therein through the outlet 35.

At this time, since the outlet 35 is very small in diameter, the fluid is not easily discharged and thus the piston 32 is also not easily lowered.

Accordingly, the valve seat 30 is also gradually buffered and lowered without a momentary downward movement.

In this process, a part of the strong impact energy applied to the valve seat 30 is used to push out the fluid filled in the cylinder 34 and is exhausted due to the instantaneous energy conversion. There is no water hammer.

In addition, since the valve seat 30 is formed in a truncated cone shape, even if foreign matter is caught around the inner diameter of the valve seat base 20 in which the valve seat 30 is closed, the corresponding inclined surface of the cone shape is in close contact. The closure also eliminates inoperability.

As described in detail above, the water hammer buffer check valve according to the present invention provides the following effects.

First, when the check valve is closed when the pump is stopped, it delays the closing time of the check valve by the fluid resistance in the check valve cylinder, thereby suppressing the conversion of the kinetic energy into the instantaneous impact energy, thereby reducing the occurrence of water hammer and thereby This prevents the device from being damaged.

Second, in the case of a large-capacity check valve is not easy to replace, but the check valve of the present invention has the advantage that it is very easy to replace.

Third, because of the operation between the piston, the cylinder according to the lifting and lowering operation rather than the rotation method has the advantage that the inoperability by the foreign matter does not occur at all.

Claims (2)

It is interposed between the main body upper portion 10a forming the outline of the check valve having one end of the large diameter and the other end of the small diameter and the both ends being open, and the large diameter side of the lower body 10b formed opposite thereto is interviewed and fixed to each other. It has a disk-shaped valve seat base 20 having an inner diameter corresponding to the small diameter; A valve seat 30 in which a truncated cone shape having a piston 32 protruded downward is mounted on the upper surface of the inner diameter of the valve seat base 20 and has a piston 32 projecting downward; The piston 32 is retractably formed into a cylindrical shape with a diameter corresponding thereto, and at the opposite end thereof, a very small funnel-shaped outlet 35 is formed, and the lower portion of the main body is formed by a support member 36 having a '<' shape. Water hammer buffered check valve, characterized in that consisting of a cylinder (34) fixed to the center (10b). According to claim 1, The valve seat 30 has a lower end surface is fixed to the upper surface of the valve seat base 20 and one side of the plurality of 'b' is fixed to the inner peripheral surface of the upper body portion (10a) Water hammer buffer check valve, characterized in that is installed to be guided by the guide plate (16).