KR101749141B1 - Back-flow prevention valve of movable cap type - Google Patents

Abstract

The present invention relates to a cap-driven backflow prevention valve that is installed in a piping and opens in the direction of fluid movement and is closed when the fluid movement is stopped, thereby exhibiting a sealing function for preventing backflow. And a lower end opened at an upper end and a lower end and being coupled to the inlet port and having a flow port opening at a side wall of the lower end so as to allow the fluid at the inlet port side to pass through the outlet port, A cylinder having a cylindrical shape with an upper end closed and a lower end closed in a shape covering the cylinder and having an inner space into which the cylinder is inserted and accommodated, and a primary pressure is applied to the inner surface of the closed upper end And the secondary side pressure acts on the outer side surface, and the outer side surface of the cylinder due to the pressure difference between the primary side pressure and the secondary side pressure Closing cap for opening / closing the flow-through opening of the cylinder while moving the cylinder, and a hermetic sealing portion provided at a portion where the main body and the opening / closing cap contact with each other. And can reduce the lateral vibration amplitude and internal friction resistance of the opening and closing cap when the opening and closing cap is reciprocated to open and close the opening of the flow passage. The hammerless, flow measurement , There is an effect that water warning can be done.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cap-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cap-driven backflow prevention valve that is installed in a pipe and opens in the direction of fluid movement and closes at the time of stopping fluid movement to exhibit a sealing function for preventing backflow.

A check valve, called a check valve, is a one-way flow valve that allows fluid to flow only in one direction and not flow in the opposite direction. It is mainly used in various types of water supply pipes.

Such a check valve is representative of a swing type (FIG. 1 (a)) and a lift type (FIG. 1 (b)), as shown in FIG.

Such a swing type or a lift type check valve has a problem in that it is difficult to ensure the reliability of operation and the accuracy of back flow tightness with the passage of time.

Further, the swing type has a problem that it can not be installed in a pipe in which the fluid moves vertically downward.

In particular, the check valve of the structure shown in Fig. 1 has a problem in that it is considerably vulnerable to impact due to a rapid change in fluid pressure including a water hammer when the fluid is water.

When a strong water hammer occurs in a water circulation pipe in a section where a conventional swing type or a lift type backflow prevention valve is installed, a clapper (swing type check valve) or a disk (a lift type check valve The clapper or the disc is cracked or broken due to a strong closure impact caused by a pressure wave applied to the top of the disc.

On the other hand, when a reduced pressure is required in the fluid supply piping system, a separate pressure reducing valve must be additionally installed.

In the case of water-based fire-extinguishing systems that require decompression, such as sprinkler fire extinguishing systems in high-rise buildings, a pressure reducing valve is necessary along with the opening / closing valve on the primary side. The watertightness of the sprinkler head is due to the existence of the statutory maximum water pressure (1.2 MPa).

In order to solve the above-described problems, a 'automatic pressure reducing valve' has been disclosed in the prior art application No. 10-2008-0018402.

The main body of the conventional automatic pressure reducing valve has an inlet and an outlet for the fluid to flow in and has an internal space. The flow cylinder is provided on the inner wall of the main body so that both ends thereof are opened and communicated with the inlet port.

The opening and closing piston inserted in the circulation cylinder is provided so as to be movable in the circulation cylinder and selectively opens and closes the flow hole in accordance with the fluid pressure difference between the inlet side and the outlet side.

The automatic pressure reducing valve having the above structure allows various flow rates to be distributed using a mechanical system that adjusts the opening and closing rates of the flow holes by the movement of the opening and closing pistons, To prevent backflow of the fluid.

However, the above-mentioned conventional technique has a problem that the area (bottom surface, A) of the opening and closing piston 130 on the inlet side is fixed and the area on the side of the outlet side (as shown in As shown in FIG. 2 (b), the upper portion of the opening / closing piston 130 is formed to be relatively large and the body 110 (110) ) Is large.

Further, as the decompression ratio becomes larger, the upper portion of the opening / closing piston 130 becomes relatively larger, so that the upper portion of the opening / closing piston 130 is vulnerable to transverse vibration, which causes unstable reciprocating motion due to lateral vibration during reciprocating movement of the opening / closing piston 130 .

Also, as the decompression ratio increases, the upper portion of the opening / closing piston 130 becomes relatively larger, thereby increasing the frictional resistance inside the main body 110, thereby causing a problem of decreasing the opening state of the flow hole.

In addition, in the above-described conventional art, there is a problem that the valve itself is difficult to be miniaturized as the upper portion of the opening / closing piston 130 becomes larger according to the reduced pressure ratio.

On the other hand, there is a problem that it is difficult to produce a standardized standard size product due to a change in the size of the main body 110 due to the reduced pressure ratio.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a backflow prevention valve capable of performing backflow prevention function.

It is also an object of the present invention to provide a hammerless backflow prevention valve having a structure that easily withstands an impact such as a water hammer.

Another object of the present invention is to provide a backflow prevention valve having a relatively small lateral vibration due to the movement of the opening and closing means for opening and closing the flow opening.

It is another object of the present invention to provide a check valve having a flow measurement function.

It is another object of the present invention to provide a check valve having an alarm function for the flow of water in a sprinkler fire extinguishing system.

It is another object of the present invention to provide a check valve capable of automatically performing a pressure reducing function.

Another object of the present invention is to provide a backflow prevention valve that can design a relatively small standard and does not require a change in the size of the main body according to the reduced pressure ratio.

It is another object of the present invention to provide a check valve having a relatively small internal friction resistance according to a reduced pressure ratio.

It is another object of the present invention to provide a backflow prevention valve in which a pressure equalized between the inflow side and the outflow side due to leakage of the inflow fluid to the outflow side does not occur even when the fluid flow is stopped, .

It is also an object of the present invention to provide a check valve having an alarm function for the flow of water in a sprinkler fire extinguishing system.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

In order to achieve the above object, the present invention has the following technical features.

The cap driven backflow prevention valve of the present invention comprises a main body having an internal hollow formed therein and having an inlet (primary side) and an outlet (secondary side) of a structure communicating with the hollow; A cylindrical cylinder having an upper end and a lower end opened and a lower end connected to the inlet and having a flow opening at a sidewall of the lower end so that fluid on the inlet side passes to the outlet; The cylinder has an inner space in which the cylinder is inserted and received in a cylindrical shape with the upper end closed and the lower end opened, a primary pressure acts on the inner surface of the closed upper end, An opening / closing cap that opens and closes a circulation opening of the cylinder while moving along an outer surface of the cylinder due to a differential pressure between the primary pressure and the secondary pressure due to the pressure of the primary pressure; And a hermetically sealed portion provided at a portion where the main body and the opening and closing cap contact each other.

Further, the cap driven backflow prevention valve of the present invention has a convex shape so that the pressure of the outlet (secondary side) is reduced compared to the inlet (primary) pressure of the main body, Wherein the opening and closing cap is formed by a lower cylindrical portion having a diameter smaller than that of the upper cylindrical portion and the upper cylindrical portion and a flow opening is formed in the lower cylindrical portion, A first sliding sealing portion located between the outer diameter surface of the upper cylindrical portion of the cylinder and the inner diameter of the opening and closing cap, and a second sliding sealing portion located on the lower cylindrical portion of the cylinder, And a second sliding sealing portion located between the outer surface of the cover and the inner surface of the opening and closing cap to form a closed space between the first sliding sealing portion and the second sliding sealing portion, .

Further, the cap driven backflow prevention valve of the present invention is characterized by further comprising a vent portion for providing an air flow path between the closed space and the outside of the main body.

Also, the cap driven backflow prevention valve of the present invention has rod-shaped teeth formed on the outer surface of the opening-closing cap and moved together with the opening-closing cap. A rotating tooth which is engaged with the rod teeth and rotates in accordance with the movement of the rod teeth; A rotating shaft coupled to the center of the rotary cogs to rotate together with the rotary cogs to penetrate the body and to expose an outer end thereof; And a sealing seal provided between the rotary shaft passing through the body and the body to provide lubricating action for rotation of the rotary shaft and to prevent leakage of the body.

Further, the cap driven backflow prevention valve of the present invention includes an indicator needle coupled to a distal end of the rotary shaft and rotated together with the rotary shaft; And a flow rate indicating graduation plate for indicating a flow rate passing through the flow opening according to a rotation angle of the indicator needle.

The cap driven backflow prevention valve of the present invention further includes an electric switch unit that operates in accordance with the rotation of the rotary shaft.

Further, the cap-driven backflow prevention valve of the present invention may further include a guide insertion rod having the opening / closing cap formed downward at an inner center thereof, wherein the cylinder further includes a guide formed at an upper opening portion, And a spring installed on and fixed to the inserted guide rod.

The cap driven backflow prevention valve of the present invention has the effect of simultaneously performing the backflow prevention function through the solution of the above problems.

In addition, there is an effect that the function of backflow prevention and decompression can be performed at the same time.

In addition, it is possible to design a relatively small size, and it is not necessary to change the size of the main body according to the pressure reduction ratio.

In addition, there is an effect of relatively reducing the lateral vibration amplitude of the opening and closing cap when the opening and closing cap is reciprocated for opening and closing the flow opening.

In addition, there is an effect that the internal friction resistance according to the reduced pressure ratio is relatively small.

In addition, there is a hammerless effect which is resistant to fluid impacts such as water hammer.

In addition, it is possible to measure the flow rate as needed, and it is possible to provide a water warning alarm simultaneously with a water warning, decompression or decompression in a sprinkler fire extinguishing system or the like.

Other advantages of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a view showing an example of a conventional check valve,
2 is a view for explaining a disadvantage of the prior art,
3 is a diagram for explaining the structure of the cap driven backflow prevention valve of the present invention,
4 is a view showing an embodiment of the cap driven backflow prevention valve of the present invention,
5 is a view for explaining the opening / closing cap of the cap driven backflow prevention valve of the present invention,
6 is a view for explaining the principle of opening / closing cap driving of the cap driven backflow prevention valve of the present invention,
7 and 8 are views showing an embodiment of the cap driven backflow prevention valve of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. It should also be understood that the position or arrangement of individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

The cap-driven check valve according to the present invention includes a main body 210, a cylinder 220, an opening / closing cap (not shown) 230 and a hermetically sealed portion 240 in a basic configuration.

As shown in FIG. 3 (b), the main body 210 has a hollow 213 and has an inlet 211 (primary side) and an outlet 212 (secondary side) of a structure that is in communication with the hollow.

As shown in FIG. 3, the main body 210 may have various shapes and structures having a space in a metallic material. However, the main body 210 may be a cylindrical shape of a metal material It is preferable that the inlet 211 and the outlet 212 are arranged in line on the same line.

As shown in FIG. 3, the cylinder 220 is located in the hollow 213 inside the body 210, and the upper and lower ends of the cylinder 220 are open and the lower end of the cylinder 220 is coupled to the inlet 211 And has a flow opening 221 at a side wall of the lower end so that fluid on the side of the inlet 211 passes to the side of the outlet 212.

That is, the cylinder 220 has a cylindrical shape and has a flow opening 221 to allow fluid (e.g., water) to flow into the hollow 213 inside the main body 210 through the inlet 211, The lower end of the open end of the cylinder 220 is coupled to the inlet 211 so that the fluid on the inlet 211 side flows to the outlet 212, (Not shown).

3, the lower end of the cylinder 220 is connected to the inlet 211, the upper end is completely opened, and the cylinder 220 includes a plurality of the flow-through openings 221 Shape and structure.

As shown in FIG. 3, the opening / closing cap 230 has a cap shape that covers the opened upper end and the entire side surface of the cylinder 210, and the upper end is closed and the lower end is opened.

That is, the opening / closing cap 230 has an internal space in which the lower end is opened and the cylinder 210 is inserted. As shown in FIG. 3, the primary side pressure is applied to the closed upper surface 231 And the secondary side pressure acts on the outer surface 232 to move along the outer surface of the cylinder 220 due to the pressure difference between the primary pressure and the secondary pressure so that the flow passage opening 221 of the cylinder 220 Open and close.

Therefore, the opening / closing cap 230 moves up and down due to the difference between the pressure on the inlet 211 and the pressure on the outlet 212 acting on the opening / closing cap 230 covering the cylinder 220, 220 of the first embodiment.

For example, when the secondary side is opened and the pressure is lowered, the opening / closing cap 230 rises to open the flow-through opening 221 to allow the fluid to flow in from the primary side. When the secondary side is closed, The cap 230 is lowered and the flow-through opening 221 is closed.

The hermetically sealing part 240 is provided on the outer side of the cylinder 220 at a portion where the main body 210 and the opening and closing cap 230 are in contact with each other. Thereby preventing the fluid from flowing into the hollow 213 inside the main body 210 at the primary side at the time of closing.

The sealed sealing part 240 is located between the outer wall between the upper end of the cylinder 220 and the flow opening 221 and the inner diameter face of the open / close cap 230, and the fluid introduced through the flow opening 221 flows into the cylinder Closing cap 230 and prevents the fluid at the inlet port 211 from flowing into the space formed between the outer wall of the cylinder 220 and the inner wall of the opening and closing cap 230, So that a predetermined closed space is formed.

The hermetically sealed portion 240 may be a sealing means of various materials having a relatively high sealing performance and a metal material such as an opening / closing cap 230 and a low coefficient of friction.

The cap driven backflow prevention valve according to the present invention may further include a cushioning sealing portion (not shown) positioned between the outer surface of the cylinder 220 and the inner surface of the opening and closing cap 230.

Regardless of whether or not the cushion sealing portion is included, normal flow of fluid between the primary side and the secondary side is possible as well as normal up and down movement.

However, when the opening / closing cap 230 is moved up and down, the opening / closing cap 230 may generate minute transverse vibrations. Due to slight transverse vibrations, the outer surface of the cylinder 220 and the inner surface of the opening / It can function as a buffer for the micro-collisions that may occur.

Therefore, the cushioning sealing portion is not necessarily in contact with the outer diameter surface of the cylinder 220 or the inner diameter surface of the opening / closing cap 230, but rather may be resistant to vertical movement of the opening / closing cap 230 do.

Hereinafter, an embodiment of the cap driven backflow prevention valve according to the present invention will be described.

As shown in the drawings, the cap-driven check valve of the present invention has a structure in which the outlet port (2) of the main body (210) The cylinder 220 has a convex shape with a diameter smaller than the lower cylindrical portion 224 and smaller than the upper cylindrical portion 223 and the upper cylindrical portion 223 so that the pressure is reduced. And a flow-through opening 221 is formed in the lower cylindrical portion 224.

 At this time, the opening and closing cap 230 has a convex internal space in which the convex cylinder 220 is inserted corresponding to the convex cylinder 220, A first sliding sealing portion 251 positioned between an outer diameter surface of the upper cylindrical portion 223 of the cylinder 220 and an inner diameter surface of the opening and closing cap 230 and an outer diameter portion 224 of the lower cylindrical portion 224 of the cylinder 220 And a second sliding sealing portion 252 is provided between the first sliding sealing portion 251 and the second sliding sealing portion 252 to define a sealed space between the first sliding sealing portion 251 and the second sliding sealing portion 252. [ do.

In other words, the cap driving-type check valve according to the present invention is formed so that the cylinder 220 has a convex shape with a relatively larger diameter than the upper cylindrical portion 223 and the upper cylindrical portion 223, And the opening and closing cap 230 is formed with a convex inner space in which a cylinder 220 having a convex shape is inserted corresponding to the cylinder 220 The first sliding sealing portion 251 is positioned between the outer circumferential surface of the upper cylindrical portion 223 and the inner circumferential surface of the opening and closing cap 230 and the second sliding sealing portion 252 is located between the outer cylindrical surface of the lower cylindrical portion 223 Closing space between the cylinder 220 and the opening / closing cap 230. The opening / closing cap 230 is disposed between the outer surface of the upper portion of the distribution opening 221 and the inner surface of the opening / closing cap 230.

As shown in FIG. 5, the opening / closing cap 230 includes a primary side pressure acting surface 231 formed on an inner upper end surface of the cap, Side pressure working surface 232 formed on the outer upper end surface in parallel with the pressure acting surface, wherein the primary-side pressure-acting surface 231 and the secondary-side pressure-acting surface 232 have an area corresponding to the reduced pressure ratio And moves up and down along the outer diameter surface of the cylinder 220 due to a difference in force acting on each surface to open or close the flow-through opening 221 of the cylinder 220.

As shown in the drawings for explaining the principle of opening / closing cap driving of the cap driving non-return valve of the present invention, the operation principle of the opening / closing cap 230 will be described in more detail. From the viewpoint of the force acting on the opening / closing cap 230, the pressure acting on the working surface 231 and the secondary pressure acting surface 232 moves along the outer diameter surface of the cylinder 220, The area of the working surface 231 is A1 and the area of the secondary pressure acting surface 232 is A2 and the pressure applied to the primary pressure acting surface 231 is P1 and the pressure acting on the secondary pressure acting surface 232 is P1, The force F1 exerted on the primary side pressure acting surface 231 by the fluid becomes A1 P1 and the force F2 exerted on the secondary side pressure acting surface 232 becomes A2 ㅧ P2.

Therefore, a secondary side pressure in inverse proportion to the area ratio between the primary side working surface 241 and the secondary side working surface 242 can not but be formed.

In other words, the opening / closing cap 230 is not moved in a state where a force equilibrium state (F1 = F2) in which A1 = P1 = A2 = P2 is established. However, And ascends or descends along the cylinder 220.

For example, when F2 is greater than F1, the flow-through opening 221 as shown in Fig. 6 is closed. When the outlet P2, which is the secondary side, is opened and the secondary pressure P2 drops, The opening and closing cap 230 is lifted along the cylinder 220 to open the flow channel opening 221 of the cylinder 220 and the flow channel opening portion 221 is opened from the outlet port The opening and closing cap 220 descends along the cylinder 220 and flows into the flow passage opening 221 when the secondary pressure P2 increases and F2 reaches a pressure (secondary setting pressure) Lt; / RTI >

Therefore, the fluid pressure P2 on the side of the outlet 212 can be defined by the following equation (1).

P2 = (A1 / A2) xP1 Expression (1)

According to the above equation (1), the depressurization ratio of the cap driven non-return valve according to the present invention is inversely proportional to the area ratio between the primary pressure action surface 231 and the secondary pressure action surface 232.

For example, in the case of the automatic pressure reducing structure as the cap driven backflow prevention valve according to the present invention, when A1 (the area of the primary pressure acting surface) is 1/2 of A2 (the area of the secondary pressure acting surface) The pressure of the outlet 211 is automatically reduced to a pressure corresponding to 50% of the primary pressure. For example, if the pressure P1 of the inlet 211 is 1 MPa (about 10 kgf / cm ² ) ) Is 0.5 MPa (about 5 kgf / cm ² ).

4, the cap-driven backflow prevention valve of the present invention includes a minute sealed space (spaced space) formed between the first sliding sealing portion 251 and the second sliding sealing portion 252, And a ventilation part 260 for circulating air in the closed space to connect the outside of the main body 210.

The ventilation portion 260 is a pipe-shaped means for connecting the closed space and the outside (atmosphere) of the main body 210 to prevent a change in atmospheric pressure due to the volume change of the minute closed space by movement of the opening / closing cap 230 The proportional pressure reduction between the pressure on the secondary side and the pressure on the secondary side is not affected.

However, even if the vent portion 250 is not formed, the decompression effect is not lost, and the opening / closing cap can be moved up and down. At the same time, the air pressure in the minute closed space is reduced to the atmospheric pressure or less in accordance with the volume increase of the minute closed space, so that the secondary pressure is reduced by the reduced pressure (Secondary pressure) that is slightly increased than the pressure of the secondary side (secondary pressure).

However, the error between the increased secondary pressure and the secondary pressure during venting is fairly minor because the air pressure in the enclosed space causes a change in the gauge pressure from zero to one atmospheres.

The cap driven backflow prevention valve according to the present invention as described above may have a backflow prevention function and / or a pressure reduction function and a backflow prevention function.

The cap driven backflow prevention valve according to the present invention has a high performance of a hammerless characteristic.

Specifically, when the operation of the pump is started, the driving power energy is transferred to the liquid fluid in the pump and simultaneously the pressure energy is converted into the pressure energy of the fluid. As a result, the pressure of the fluid in the pump rises rapidly through the fluid in the pump discharge pipe Pressure wave is transmitted in the form of a pressure wave, the pressure wave reflected from the dead end of the pipe returns to the check valve on the pump discharge side, (Clapper in the case of a valve, disk in the case of a leaf type check valve), water hammer is applied to the clogging part (clapper or disc) depending on the degree of impact, In severe cases, it can cause damage. Such an impact is due to the fact that a force is applied to the shut-off valve due to the time rate of change of the momentum held by the fluid due to sudden shutoff of the valve while the fluid is normally flowing through the pipe (that is, the physical definition of the force) The sudden rise of the instantaneous pressure and the simultaneous pressure wave to the pump side can result in the same effect as the impact due to the surging phenomenon described above with respect to the closing drive due to the impact (water if the fluid is water). The clapper of the swing check valve or the disk of the lift type check valve is cast iron which is vulnerable to impact due to a large hardness (hardness), so it is not useful to have impact resistance (water resistance in case of water) Based on the fact that when the disc is returned to the sheet by the pressure wave reaching the open disc and it collides with the sheet, the disc is liable to crack due to the shock, the disc first seats on the sheet In the meantime, a hammerless check valve with a spring mounted on the upper surface of the seat is widely used, but its functionality is extremely suspected based on the physical characteristics of the pressure wave. This is because when the fluid is water, the velocity of the pressure wave at 0 ° C is about 1200 m / s and the velocity at 20 ° C is about 1480 m / s. Unless the length of the piping to the shut-off valve is very long, the time required to hit the sheet by the force of the pressure wave is generally shorter than the time required for the disk to be seated on the seat by the force of the spring This is because we have to lose. The cap driven backflow prevention valve according to the present invention is characterized in that the constituent material of the opening and closing cap 230 is not a cast iron but mainly a steel material, and in the open state, an impact (water in case of water) It is practically impossible to cause the deformation of the side wall only by the compressive force. In addition, since the lower end of the opening / closing cap is prevented from being deformed due to the strong pressure wave, There is an effect that the impact is considerably alleviated due to the elasticity of the hermetically sealed portion even when the hermetically sealed portion comes into contact with a strong force. However, if it is expected that the top surface (plane perpendicular to the direction of action of the pressure wave) of the opening and closing cap is likely to have an effect on the deformation of the top surface due to an excessive impact, the top surface may be made somewhat thicker or conical The possibility of deformation can be easily removed, so that the opening / closing cap itself can have excellent shock resistance performance without a non-scientific manner such as a spring.

7, the cap driven backflow prevention valve further includes rod teeth 300, a rotation tooth 310, and a rotation shaft 320, as shown in the drawing of an embodiment of the cap driven backflow prevention valve of the present invention can do.

The rod teeth 300 are formed in a structure bound to the outer surface of the opening and closing cap 230 and are formed in the moving direction of the opening and closing cap 230 and move together with the opening and closing cap 230.

The rotation teeth 310 are formed to be engaged with the rod teeth 300 and rotate about the rotation axis 320 by the movement of the rod teeth 300.

The rotary cogs 310 are fixed to the central axis of the rotary shaft 320 and rotate in place as the bar cogs 300 move. As shown in Fig. 7, as the opening / closing cap 230 rises, 300 rotate together and the rotating teeth 310 engaged with the rod teeth 300 rotate in the clockwise direction and rotate in the counterclockwise direction when the opening and closing cap 230 is lowered.

The rotation shaft 320 is coupled to the center of the rotation tooth 310 and rotates together with the rotation tooth 310. The distal end of the rotation shaft 320 passes through the body 210 and is exposed to the outside.

The rotation shaft 320 rotates together with the rotation teeth 310 rotated by the movement of the opening and closing cap 230 and the distal end of the rotation shaft 320 is exposed to the outside of the body 210, Or a means for switching operation, so as to perform various functions such as a flow rate display or an alarm function.

The rotation shaft 320 is provided between the rotation shaft 320 and the main body 210 through the main body 210 to provide the rotation of the rotation shaft 320 for rotation and to prevent the leakage of the main body 210 And a sealing seal serving to prevent leakage of the fluid.

7, the cap driven backflow prevention valve according to the present invention includes an indicator needle 340 coupled to a distal end of the rotation shaft 320 and rotated together with the rotation shaft 320, And a flow display graduation plate 350 for indicating the flow rate passing through the flow-through opening 221 of the cylinder 220 according to the rotation angle of the needle 340.

That is, the flow rate is displayed through the change in the area of the flow-through opening 221 that is opened due to the movement of the opening / closing cap 230.

For example, in the state in which the opening / closing cap 230 of the cap driving non-return valve of the present invention is closed, the indicator pin 340 of the flow rate display graduation plate 350 becomes a zero point state. When the pressure at the outlet port 212 side , The opening / closing cap 230 which has closed the flow-through opening 221 is moved by the pressure difference and gradually starts to open the flow-through opening 221 of the cylinder 220 gradually as the flow rate gradually increases. At this time, The rod teeth 300 bound to the rotating rod 230 move together to rotate the rotating teeth 310 and the indicating needles 340 connected to the rotating teeth 310 by the rotating shaft 320 rotate, The flow rate can be measured through the flow rate display dial plate 350 that displays the pipe flow rate (the discharge amount of the pump when the pump is installed on the discharge side of the pump).

delete

8, the opening / closing cap 230 further includes a guide inserting rod 233 formed at an inner center thereof downward, and the cylinder (not shown) 220 further includes a guide 225 formed at an upper opening portion and a spring 400 installed and fixed to the guide insertion rod 233 inserted in the guide 225.

8, the cylinder 220 includes a guide 225 coupled to or integrally formed with the top opening portion. The opening / closing cap 230 is inserted into the guide insertion rod 230 inserted into the guide 225, A spring 400 is installed between the guide 225 and the lower end of the guide insertion rod 233 to pull the opening and closing cap 230. As shown in FIG.

In the vertical installation, the cap 220 functions as a means for returning the cap 230 to the original position, and the cap 220 can be firmly closed through the cap 230. do.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And such variations and modifications are intended to fall within the scope of the appended claims.

210:
211: inlet
212: outlet
220: Cylinder
221: Distribution opening
223: upper cylindrical portion
224: lower cylindrical portion
225: Guide
230: opening / closing cap
231: primary pressure side
232: secondary pressure side
233: guide insertion rod
240: sealing sealing part
251: first sliding sealing portion
252: a second sliding sealing portion
260:
300: Rod sprocket
310: rotating teeth
320:
340: Instruction needle
350: Flow display plate
400: spring

Claims (7)

A main body having a hollow inside and having an inlet (primary side) and an outlet (secondary side) structured to be in communication with the hollow;
A cylindrical cylinder having an upper end and a lower end opened and a lower end connected to the inlet and having a flow opening at a sidewall of the lower end so that fluid on the inlet side passes to the outlet;
The cylinder has an inner space in which the cylinder is inserted and received in a cylindrical shape with the upper end closed and the lower end opened, a primary pressure acts on the inner surface of the closed upper end, An opening / closing cap that opens and closes a circulation opening of the cylinder while moving along an outer surface of the cylinder due to a differential pressure between the primary pressure and the secondary pressure due to the pressure of the primary pressure; And
And a hermetic sealing part provided at a portion where the main body and the opening / closing cap contact each other,
A rod saw which is formed on the outer surface of the opening and closing cap and moves together with the opening and closing cap;
A rotating tooth which is engaged with the rod teeth and rotates in accordance with the movement of the rod teeth;
A rotating shaft coupled to the center of the rotary cogs to rotate together with the rotary cogs to penetrate the body and to expose an outer end thereof; And
And a sealing seal provided between the rotation shaft passing through the body and the main body to provide a lubricating action for rotation of the rotation shaft and to prevent water leakage of the main body. The method according to claim 1,
The cylinder is formed in a convex shape so that the pressure of the outlet (secondary side) is reduced compared to the inlet (primary) pressure of the main body. The cylinder has a diameter smaller than that of the lower cylindrical portion Wherein the opening and closing cap is formed of a lower cylindrical portion having a larger diameter and a flow opening is formed in the lower cylindrical portion and the opening and closing cap is made of iron having a convex- A first sliding sealing portion located between the outer diameter surface of the upper cylindrical portion of the cylinder and the inner diameter surface of the opening and closing cap and a second sliding sealing portion located between the outer diameter surface of the lower cylindrical portion of the cylinder and the inner surface of the opening and closing cap Wherein the second sliding sealing portion is located between the first sliding sealing portion and the second sliding sealing portion, thereby forming a closed space between the first sliding sealing portion and the second sliding sealing portion. 3. The method of claim 2,
And a venting portion for providing an air flow path between the closed space and the outside of the main body. delete The method according to claim 1,
An indicator needle coupled to a distal end of the rotary shaft and rotated together with the rotary shaft; And
And a flow indication graduation plate for indicating a flow rate passing through the flow-through opening according to a rotation angle of the indicator needle. delete The method according to claim 1,
Wherein the opening / closing cap further includes a guide insertion rod formed downward at an inner center,
Wherein the cylinder further comprises a guide formed at an upper opening portion,
And a spring installed on and fixed to the guide insertion rod inserted into the guide.

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