JPH0722177U - safety valve - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a safety valve that can discharge pressure in a linear response to pressure. [Composition] Cavity chamber 1 of cylinder 10 from fluid inlet 12
The fluid that has flowed in 1 through the hole 43 through the hollow through hole 4 of the valve rod 40
1 and the internal pressure in the hollow through hole 41 increases, the ball valve 53 that contacts the end of the valve rod 40 is pushed open to flow out from the water outlet 54 of the movable flanger 50, and the shell seat 20
The water in the safety valve is discharged from the water outlet 24 of the above. Then, when the inflow amount of the fluid from the fluid inlet 12 increases and the pressure of the fluid flowing out of the water outlet 54 of the movable flanger 50 increases, the valve rod 40 and the movable flanger 50 are pushed up against the force of the pressure spring 23. The fluid inlet 12 and the drain port 13 which are partitioned by the plug 42 at the end of the valve rod 40 communicate with each other, the fluid is discharged from the drain port 13, and the pressure in the safety valve is discharged.

Description

[Detailed description of the device] [Industrial applications]

 The present invention is related to the improvement of the safety valve, and more specifically, it is a kind of structural improvement of the safety valve.

[Prior art]

 In order to ensure the safety of general high-pressure fluids, a safety valve is usually installed in the piping to provide a pressure discharge protection function when the pressure is exceeded, especially in high-pressure pumps. Use is quite common, it can be set to working pressure, and if the water pressure at the end of the pipe is too high, the water inside can be completely drained to zero pressure.

[Problems to be solved by the device]

There are several dozen safety valves currently on the market, but they both have the following problems. (1) The effect of exhaust pressure is uncertain. According to the design philosophy, when the set pressure is 30 kg / cm ² , the pressure must be reached and the pressure must be released. Most of the conventional pressure relief valves have a set pressure. It does not work reliably and often starts discharging pressure after exceeding a certain proportion above the set pressure, and the effect is not certain. (2) The combined piping is too complicated. When using a safety valve, existing pipes are often folded over to the safety valve, and a combination valve seat is installed in the pipe, which causes additional trouble. (3) Wear is accelerated and the effectiveness is easily lost. The general design of the existing safety exhaust pressure valve is to push the closed exhaust pressure valve at the preset pressure with the pressure at the time of blockage in the pipe, so that the internal parts come into contact with each other without knowing and the number of shocks increases. , The parts will be damaged and lose their effectiveness, and the service life will be shortened. In view of this, the inventor of the present invention actively researched and developed based on the technical experience of many years in this industry, and finally completed the present invention. That is, a main object of the present invention is to provide a structure improvement of a safety valve in which a reliable exhaust pressure effect is obtained and piping is simplified.

[Means for Solving the Problems]

 According to a first aspect of the present invention, a cylinder is formed inside which is a hollow chamber, at least one of which is provided with a fluid inlet and a discharge port which communicate with the hollow chamber, and one end of which is a cylinder fixedly connected to the shell. A shell that has a pressure adjusting screw, a spring seat, a pressure spring, and at least one water outlet that communicates with the inside, and a through hole that is fixed between the cylinder and the shell and that has a through hole. An O-ring is attached to the inner wall, and an O-ring is also attached to the outer periphery. The fixed partition that keeps the cylinder and the inner wall of the shell tightly sealed, and the hollow rod that is passed through this fixed partition, the hollow part The cylinder and the shell are communicated with each other, the cylinder and the shell are separated from each other on the outer peripheral surface, and a plug for controlling the discharge port is provided at one end, and the outside of the other end has a predetermined area. It is formed on the ring shoulder and close to the plug. The valve rod is provided with a hole that communicates with the fluid inlet, and is provided inside the shell, and an O-ring is provided outside to allow close movement with the inner wall of the shell, and inside the shell. A ball valve and a plurality of water outlets are provided.The ball valve blocks the hollow through hole of the valve rod, and the ball valve controls the communication between the air through hole and the discharge hole of the valve rod. A plunger head is formed that is compounded with the spring, and the plunger head has a movable plunger to which the elastic force of the pressure spring is transmitted. According to a second aspect of the invention, in the first aspect of the invention, the movable plunger and the valve rod are fitted to each other, and the connection between the two is maintained by the internal water pressure. According to a third aspect of the present invention, in the second aspect of the present invention, the valve rod has a conical or pyramidal plug, and the outlet is fitted with a valve seat fitted with the plug. According to a fourth aspect of the present invention, in the third aspect of the invention, a sleeve made of an abrasion resistant material is fitted to the inner wall of the shell that the movable plunger corresponds to. A fifth aspect of the invention is the device of the fourth aspect, wherein the valve rod is integrally formed by die casting. The invention according to claim 6 is the device according to claim 5, wherein the ball valve in the movable plunger is fixedly contacted with each other by the valve seat and the conical valve plug, and at the same time, the O-ring is fitted to move the ball valve and the ball valve. A fixed seat for the ball valve is provided between the plunger and the plunger.

[Action]

 According to the first aspect of the invention, the fluid that has entered the cylinder through the fluid inlet flows into the hollow through hole of the valve rod through the hole. When the internal pressure of the hollow push hole rises due to the inflowing fluid, the ball valve is pushed up to flow out from the water outlet of the movable plunger, and is discharged from the water outlet provided in the shell seat. This releases the pressure. At this time, when the amount of fluid entering the cylinder from the fluid inlet exceeds the amount of fluid flowing out from the outlet of the movable plunger, the shell seat and the valve rod restricted by the movable plunger and the fixed separating piece are separated. The internal pressure in the space between them increases, and the pressure applied to the ring shoulder of the valve rod pushes up the valve rod and the movable plunger against the force of the pressure spring, and the plug provided at the end of the valve rod is pushed up. Fluid separates from the cylinder and flows into the cylinder drain. This releases the pressure. According to the second aspect of the invention, the valve rod and the movable plunger are fitted to each other so that the two can be assembled as a set. Further, in the third aspect of the invention, the conical valve rod is formed. And the plug comes into contact with the valve seat, the plug separates from the valve seat when the valve rod is displaced, and flows out to the drainage port of the cylinder. Further, in the invention according to claim 4, the movable plunger moves when the movable plunger is displaced. By sliding on the sleeve, the wear of each part is reduced, and in the device according to claim 5, the valve rod is integrally molded by die casting, which facilitates its manufacture. Furthermore, in the device according to claim 6, A ball valve is formed by fixing the valve seat and the conical valve plug.

【Example】

 An optimum embodiment of the present invention will be described with reference to FIGS. The structural improvement of the safety valve of the present invention mainly includes the following. Cylinder 10, the inside of which is formed into a cavity chamber 11, and two inlets 12 as fluid inlets for communication used for inflow of high-pressure water and two outlets used for discharge of high-pressure water. A drain port 13 as a discharge port is provided, and a valve seat 14 as a valve seat is provided at a place where the drain port 13 and the hollow chamber 11 communicate with each other. The other end of the cylinder 10 is shelled with a bolt 15. It is connected to the seat 20. The shell 20 is provided with an internal thread 20a in its outer shell, which is screwed with a pressure adjusting screw 21 as a pressure adjusting screw, whereby the pressure adjusting screw 21 is rotated and pressed against the spring upper seat 22. A pressure spring 23 connected to the upper seat 22 is pressed to set the pressure, and the shell 20 is provided with two water outlets 24 that communicate with the inside. The fixed separating piece 30, which fixes the cylinder 10 and the shell 20 by the bolt 15, is fixedly connected between the cylinder 10 and the shell 20 at the same time, and the fixing partition 30 is provided with the through hole 31. Two O-rings 32 are fitted to the inner wall of the through hole 31 with an annular groove, and an O-ring 33 is also attached to a portion where the outer periphery of the fixed separating piece 30 and the cylinder 10 and the shell 20 are joined. In addition, close contact with the inner wall of the shell 20 is prevented, and water leakage can be prevented. The valve rod 40 is a hollow rod body that is passed through the fixed separating piece 30, and a hollow hollow through hole 41 is formed inside the valve rod 40. One end of the valve rod 40 is a conical plug 42 as a plug that is combined with the valve seat 14 of the drainage port 13. The valve rod 40 in the hollow chamber 11 of the cylinder 10 is provided with a hole 43 communicating with the hollow through hole 41, and the other end of the valve rod 40 is formed with a ring shoulder portion 44 having a predetermined area. Further, a fitting edge 45 is further extended to the upper end of the ring shoulder portion 44 of the valve rod 40. The valve rod 40 and the fixed separating piece 30 are combined with each other, and an O-ring 33 is provided between the valve rod 40 and the fixed separating piece 30 so as to prevent water from leaking, so that a close state is maintained and the fixed separating piece 30 is kept. Since the cylinder 10 and the shell 20 are separated from each other, the flow of water flows into the hollow through hole 41 through the hole 43 of the valve rod 40 and is sent into the shell seat 20. Movable plunger 50, which is formed into a generally tubular slide, the closed end of which is a hexagonal plunger head 51. The movable plunger 50 is pressed against the valve rod 40 by the pressure spring 23 and transmits the set pressure of the pressure spring 23 to the valve rod 40. Inside the open end of the movable plunger 50, a return spring 52 and a ball valve 53 are fitted in order in the axial direction thereof, and also fitted with a fitting edge 45 of the valve rod 40 with the open end. Close. The ball valve 53 is formed such that the valve seat 531 and the conical valve plug 532 are fixedly contacted with each other, and an O-ring 533 is fitted between the valve seat 531 and the valve plug 532 at the same time when the valve seat 531 is fixedly contacted. In addition, the conical valve plug 532 can control the opening and closing of the hollow through hole 41 of the valve rod 40, the side wall of the movable plunger 50 is provided with a plurality of water outlets 54, and the movable plunger 50 further has a water outlet 54. An O-ring 55 is provided on the outer edge, and at the same time, a wear-resistant sleeve 56 made of stainless steel is attached to the inner wall of the shell 20 with an adhesive between the movable plunger 50 and the inner wall of the shell 20. It is bonded so that the wear resistance of the movable plunger 50 when sliding is increased, and the inner wall of the shell 20 is not directly worn. When the present invention is used in such a configuration, the pressure adjusting screw 21 is first adjusted to set the pressure of the safety valve. In this case, there is no flow of water in the valve (as shown in FIG. 1), and the ball valve 53 is pressed against the hollow through hole 41 of the valve rod 40 by the action of the return spring 52, and the conical shape of the valve rod 40 is formed. The plug 42 is actuated by the pressure spring 23 to close the drainage port 13. When the water flows into the water inlet 12 (as shown in FIG. 2), the water flows through the hole 43 of the valve rod 40 into the hollow through hole 41, the ball valve 53 is pushed open, and the water outlet 54 is passed. Since water flows out from 24, the valve rod 40, the movable plunger 50, etc. do not move in a normal use state, the position of the conical plug 42 as a valve does not change, and the drainage port 13 remains closed. To do. Then, if the water outlet 24 is closed, water does not flow out, and the water pressure in the valve immediately rises. In this embodiment, the ring shoulder portion 44 of the valve rod 40 has a relatively large force receiving area (see FIG. 4), and if the outer diameter area of the ring shoulder portion 44 is A, the water pressure of the valve rod 40 is Assuming that the area that is not covered is al (that is, the area of the valve rod 40 in the direction in which the rod diameter is slightly smaller), both (A-al) areas are subject to a slightly higher water pressure, and This is the direction in which the spring 23 is compressed. In this case, the water pressure in the valve also generates a pressure on the fixed partition 30, but since the fixed partition 30 is fixed to the valve body, the water pressure P is P × (A Generate a tension of -al) = F. If the force of F is larger than the predetermined pressure, F pulls the valve rod 40, opens the drainage port 13 to exhaust the pressure (as shown in FIG. 3), and at the moment before exhausting the pressure, the valve rod 40 is pressed. The pressure inside 40 is the same as the pressure outside the valve rod 40. In this case, the return spring 52 presses the ball valve 53 and the hollow through hole 41 of the valve rod 40 is closed. Therefore, the ball valve 53 immediately closes the hollow through hole 41 of the valve rod 40 when the pressure releasing operation is started. In the process of discharging pressure, the valve still keeps discharging pressure, and since the discharging pressure is maintained, the ball valve 53 continuously maintains the closed state. It is extremely reliable. As described above, in the present invention, since the tension of the exhaust pressure is generated by using the area of (A-al), if the ratio of the area A and the area al is set according to the pressure at the time of designing, The exhaust pressure effect of the present invention is certain. In addition, the area al can be changed by adjusting the valve rod 40, which is extremely convenient for manufacturing and adjusting the exhaust pressure. Further, in the present invention, since the valve rod 40 is moved by water pressure, the valve rod 40 itself does not push against or abut against the valve rod 40, and the valve rod 40 itself does not rub, which prolongs the service life. It is also worth noting that, in the embodiment of the present invention, since the fitting edge 45 of the valve rod 40 is fitted to the open end of the movable plunger 50 (screwing is also possible), it can be separated from the operation process of FIGS. 1 to 3. As described above, when there is no water pressure in the valve, the elastic force of the pressure spring 23 presses the movable plunger 50 against the upper end of the valve rod 40, and the open end of the movable platen 50 is fitted to the fitting edge 45 of the valve rod 40. . When the pressure is released, the valve rod 40 receives the force of F and pulls the valve rod 40 in the opposite direction, and at the same time maintains the close contact between the fitting edge 45 and the movable plunger 50. That is, under any circumstance, the fitting edge 45 of the valve rod 40 maintains the joint with the movable plunger 50, and in the present embodiment, it suffices to fit the two together, and the manufacturing and processing steps are reduced. it can.

[Effect of device]

 As a whole, the safety valve of the present invention has at least the following effects. (1) By changing the area of the valve rod itself, the reverse pressure generated by the water pressure with respect to the area achieves the function of exhaust pressure, and the water pressure directly generates tension in the valve rod. There is no pressure on the rod, and the pressure relief effect is certain. (2) When designing, the rod diameter of the valve rod can be adjusted according to the actual situation to adjust the force receiving area of the exhaust pressure. If different types of safety valves are used, it is possible to make them different by simply designing different valve rods, and the valve rods will be interchangeable. (3) The valve rod is made by integral molding. In addition, since there is no need for secondary processing, the fitting edge and the movable plunger are directly fitted and the force receiving relationship between them is used, so the joint between the movable plunger and the valve rod is maintained, and the processing cost can be reduced. . (4) The safety valve of the present invention is designed to have two outlets and outlets, and it can be used immediately if pipes are attached to the outlet and outlet, so the piping attached to the present invention is extremely simple. Moreover, it can be installed directly on the side, and can be applied to various types of high-pressure pumps, atomizers, and high-pressure equipment. To summarize the above, the safety valve of the present invention directly draws the valve rod by using water pressure, the exhaust pressure effect of the valve rod is reliable, and various functions can be enhanced, and its practicality is doubtful. Nor.

[Brief description of drawings]

1 is a cross-sectional side view of the preferred embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view of a preferred embodiment of the present invention during normal use.

FIG. 3 is a vertical cross-sectional side view of the optimum embodiment of the present invention when a discharge pressure is activated.

FIG. 4 is a side view of the valve rod when receiving force on the valve rod according to the preferred embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cylinder 11 Cavity chamber 12 Fluid inlet 13 Discharge port 14 Valve seat 20 Shell seat 21 Pressure adjusting screw 22 Spring top seat 23 Pressure spring 24 Water outlet 30 Fixed separating piece 31 Through hole 32 O ring 33 O ring 40 Valve rod 41 Hollow through hole 42 plug 43 hole 44 ring shoulder 50 movable plunger 51 plunger head 53 ball valve 54 water outlet 55 O-ring 56 sleeve 531 valve seat 532 conical valve plug 533 O-ring

Claims (6)

[Scope of utility model registration request] 1. A cylinder, which is internally formed into a hollow chamber, is provided with at least one fluid inlet and discharge port communicating with the hollow chamber, and has one end axially fixedly connected to a shell and a pressure adjusting screw. , The spring seat, the pressure spring, and the shell that is provided with at least one water outlet that communicates with the inside, and is fixed between the cylinder and shell, and a through hole is provided, and an inner wall of this through hole An O-ring is attached to the cylinder, and an O-ring is also attached to the outer periphery of the cylinder to fix the cylinder and the inner wall of the shell to each other, and a hollow rod that is passed through the fixed diaphragm. The cylinder communicates with the shell seat at a portion, the outer peripheral surface separates the cylinder from the shell seat, and one end has a plug for controlling the discharge port, and the outside of the other end is predetermined. Formed on the ring shoulder with a certain area , A valve rod having a hole communicating with the fluid inlet at a portion approaching the plug, and an O-ring provided on the inside of the shell seat and an outside of the shell seat to closely contact the inner wall of the shell seat. The ball valve and a plurality of water outlets are provided inside, and the ball valve closes the hollow through hole of the valve rod, and the ball valve causes the hollow through hole of the valve rod. And a plunger head that controls the communication between the discharge hole and that is mixed with the pressure spring at the top end, and that has a movable plunger to which the elastic force of the pressure spring is transmitted by the plunger head. Characteristic safety valve. 2. The safety valve according to claim 1, wherein the movable plunger and the valve rod are fitted to each other, and the connection between the two is maintained by internal water pressure. 3. The safety valve according to claim 2, wherein the plug of the valve rod has a conical shape, and a valve seat fitted with the plug is fitted in the discharge port. 4. The safety valve according to claim 3, wherein a sleeve made of wear-resistant material is fitted on the inner wall of the shell seat to which the movable plunger corresponds. 5. The safety valve according to claim 4, wherein the valve rod is integrally molded by die casting. 6. The ball valve in the movable plunger is fixedly attached to each other by a valve seat and a conical valve plug, and at the same time, an O-ring is fitted, and the ball valve is provided between the ball valve and the movable plunger. 6. The safety valve according to claim 5, wherein a fixed seat is provided.