CN203940009U - Ultrahigh pressure Decompression valves - Google Patents

Abstract

The utility model relates to Decompression valves, is specially a kind of ultrahigh pressure Decompression valves.Solve that complex structure, the pressure medium that existing ultrahigh pressure Decompression valves exists easily leaks, difficulty defect and the problem of use and maintenance cost and maintenance.This ultrahigh pressure Decompression valves comprises a ultrahigh pressure one-way valve and an oil hydraulic cylinder for driving ultrahigh pressure one-way valve to open and close, on the cylinder barrel of oil hydraulic cylinder, be fixed with flange plate, the uuper valve block of flange plate and ultrahigh pressure one-way valve is bolted, and between the piston rod of oil hydraulic cylinder and one-way valve, seals by pressing plate and seal ring; On ultrahigh pressure one-way valve, have additional valve seat and spool.The utility model is by the improvement to the sealing configuration between the linkage structure between ultrahigh pressure one-way valve and oil hydraulic cylinder, hydraulic cylinder piston rod and control hole and ultrahigh pressure one-way valve self structure, defect and problem that existing product exists are overcome, its architecture advances is reasonable, unique, make product with compact structure, function admirable, use after improving more reliable, improved working life.

Description

Ultra High Pressure Relief Valve

technical field

The utility model relates to a pressure relief valve, in particular to an ultra-high pressure pressure relief valve.

Background technique

The ultra-high pressure pressure relief valve is a crucial component in the ultra-high pressure equipment container, and it is also a component with a high failure rate. The ultra-high pressure relief valve includes an ultra-high pressure check valve and a hydraulic cylinder for driving the ultra-high pressure check valve to open and close. The ultra-high pressure check valve includes an upper valve block and a lower valve block. The upper valve block and the lower valve block are sealed and fastened together by locking bolts to form a valve body. The upper valve block and the lower valve block are respectively opened with valves communicating with each other. Usually, one end of the valve hole on the upper valve block is used as the pressure fluid inlet, and one end of the valve hole on the lower valve block is used as the pressure fluid outlet. The valve hole of the upper valve block forms a diameter near the contact surface of the upper and lower valve blocks The variable-diameter hole section is larger than the diameter of the valve hole, and the sealing ball is arranged in the variable-diameter hole section. The sealing ball is located on the valve hole port of the lower valve block. The sealing ball and the valve hole port of the lower valve block form a sealing pair. The sealing ball The upper part of the lower valve block is a return spring located in the variable-diameter hole section; the valve hole on the lower valve block is a folded hole composed of a vertical section and a horizontal section, and the lower bottom surface of the lower valve block has a vertical section of the folded hole on it. The control holes communicate with each other and the axes coincide, and the piston rod seal of the hydraulic cylinder extends into the control hole. When the piston rod of the control hydraulic cylinder rises, the piston rod overcomes the elastic force of the return spring and pushes up the sealing ball. At this time, the pressure relief valve is in the pressure relief state. The liquid outlet flows out to realize pressure relief; when the piston rod of the hydraulic cylinder moves down under control, the sealing ball moves down under the action of the pressure difference between the pressure liquid inlet and the pressure liquid outlet and the elastic force of the return spring (the return spring also acts To guide the sealing ball), form a seal with the valve hole port of the lower valve block, and stop the pressure relief.

The existing ultra-high pressure relief valve has the following defects and problems: 1. The connection structure between the hydraulic cylinder and the ultra-high pressure check valve is unreasonable, resulting in a complicated structure. 2. The sealing structure between the control hole and the piston rod is unreasonable, which may easily cause leakage of the pressure medium. 3. Due to the fragility of the return spring of the ultra-high pressure check valve, the check valve often cannot work normally, which affects the service life of the check valve and the pressure relief valve. The sealing ball directly forms a sealing pair with the valve hole port on the lower valve block. Once the sealing pair is damaged, the entire valve body of the ultra-high pressure check valve is generally damaged, which is equivalent to the scrapping of the entire check valve or pressure relief valve. Such use and maintenance The cost and difficulty of maintenance are high.

Contents of the invention

The utility model provides an ultrahigh pressure relief valve with improved structure in order to solve the above-mentioned defects and problems existing in the existing ultrahigh pressure relief valve.

The utility model is realized by adopting the following technical solutions: the ultra-high pressure relief valve includes an ultra-high pressure check valve and a hydraulic cylinder for driving the opening and closing of the ultra-high pressure check valve; the ultra-high pressure check valve includes an upper valve block and a The lower valve block, the upper valve block and the lower valve block are respectively provided with valve holes communicating with each other. The valve hole on the lower valve block is a folded hole composed of a vertical section and a horizontal section. The vertical section of the folded hole on the top is connected and the axis coincides with the control hole. The control hole is a stepped hole composed of at least three stages with smaller diameters from bottom to top; the piston rod extension end of the cylinder barrel of the hydraulic cylinder The flange cover plate is fixed, and the piston rod hole is opened on the flange cover plate. The piston rod hole is a stepped hole composed of at least three stages with smaller diameters from top to bottom. The piston rod of the hydraulic cylinder passes through the flange. The piston rod on the cover plate passes through the hole, and the piston rod of the hydraulic cylinder passing through the piston rod hole is successively covered with a lower sealing ring located in the second-stage aperture of the piston rod hole, and the lower seal ring falls into the first hole of the piston rod hole. The gland and the upper sealing ring in the aperture of the first stage, the upper and lower end surfaces of the gland extend upward and downward respectively to surround the piston rod. The convex ring extending downward extends into the second stage of the piston rod through hole. The hydraulic cylinder piston rod extends into the control hole at the bottom of the lower valve block and the vertical section of the valve hole. The first-stage aperture of the control hole is embedded in the upper part of the gland, and the upper sealing ring is located in the control hole. In the second-stage aperture of the control hole, the upwardly extending convex ring of the gland extends into the second-stage aperture of the control hole and presses the upper sealing ring; the upper valve block and the flange cover are locked with bolts, so that the lower The valve block is pressed and fixed between the upper valve block and the flange cover (that is, the outer dimension of the lower valve block is smaller than that of the upper valve block), and the gland presses the upper and lower sealing rings tightly. The working process of the ultra-high pressure relief valve is the same as that of the existing products, that is, the piston rod of the hydraulic cylinder moves up and down to control the opening and closing of the ultra-high pressure one-way valve. The setting of the flange cover plate and its connection structure with the upper valve block cleverly realize a stable and reliable fixed connection between the hydraulic cylinder and the ultra-high pressure check valve, and the setting of the gland and the upper and lower sealing rings solve the problem well. The sealing problem between the piston rod and the control hole is solved, and the sealing structure is reasonable, unique, reliable and simple.

Further, the part of the valve hole on the lower valve block close to the contact surface of the upper and lower valve blocks is expanded into the lower hole section of the valve seat, and the part of the valve hole on the upper valve block close to the contact surface of the upper and lower valve blocks is expanded into the upper hole section of the valve seat. Hole section, the upper part of the upper hole section of the valve seat is a variable diameter hole section, the lower hole section of the valve seat and the upper hole section of the valve seat cooperate to form a valve seat cavity, the seat cavity is sealed with a valve seat, and a through hole is opened on the valve seat , the through holes communicate with the valve holes on the upper and lower valve blocks respectively. There is a sealing ball in the variable diameter hole section that forms a sealing pair with the through hole port on the valve seat. The upper part of the sealing ball is located in the variable diameter hole section. For the spool that guides the movement of the sealing ball (so that it is always aligned with the through-hole port), the spool has an axial through hole (the axial direction of the valve hole including the variable-diameter hole section is the axial direction). There are also radial holes communicating with the axial through holes. In this way, by changing the return spring to the valve core (actually, the pressure difference between the outlet and inlet of the pressure liquid is enough to reset the sealing ball), the problem of the fragile return spring is overcome, thereby also improving the service life of the one-way valve . By adding a valve seat, the existing sealing ball directly forms a sealing pair with the valve hole port on the lower valve block, and becomes a sealing pair formed by the sealing ball and the through-hole port on the valve seat. Once the sealing pair is damaged, it only needs to be replaced The sealing ball and the valve seat are sufficient, and there is no need to replace the valve block, which not only facilitates maintenance, but also reduces the cost of use and maintenance.

Compared with the existing products, the utility model adopts the design of the connection structure between the ultra-high pressure check valve and the hydraulic cylinder, the sealing structure between the piston rod of the hydraulic cylinder and the control hole, and the structure (spool) of the ultra-high pressure check valve itself. The improvement overcomes the defects and problems existing in the existing products, and its structural improvement is reasonable and unique, so that the improved product has a compact structure, excellent performance, more reliable use, and a longer service life.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1-hydraulic cylinder, 2-upper valve block, 3-lower valve block, 4-valve hole, 5-control hole, 6-flange cover plate, 7-piston rod through hole, 8-lower sealing ring, 9-gland, 10-upper sealing ring, 11-protruding ring, 12-bolt, 13-bottom hole section of valve seat, 14-upper hole section of valve seat, 15-reducing hole section, 16-valve seat, 17- Sealing ball, 18-spool, 19-axial through hole, 20-radial hole.

Detailed ways

The ultra-high pressure relief valve includes an ultra-high pressure check valve and a hydraulic cylinder 1 for driving the opening and closing of the ultra-high pressure check valve; the ultra-high pressure check valve includes an upper valve block 2 and a lower valve block 3, the upper valve block and the There are valve holes 4 communicating with each other on the lower valve block respectively. The valve holes on the lower valve block 3 are folded holes formed by a vertical section and a horizontal section. The control hole 5 is a control hole 5 that is connected with each other and the axis coincides. The control hole 5 is a stepped hole composed of at least three stages with smaller diameters from bottom to top; the piston rod extension end of the cylinder barrel of the hydraulic cylinder is fixed with a flange. The cover plate 6 and the flange cover plate 6 are provided with a piston rod through hole 7, and the piston rod through hole 7 is a stepped hole composed of at least three stages with smaller diameters from top to bottom. The piston rod hole 7 on the cover plate 6 passes through, and the hydraulic cylinder piston rod passing through the piston rod hole is sequentially covered with a lower sealing ring 8 located in the second-stage aperture of the piston rod hole, and the lower part falls into the piston rod hole. The gland 9 and the upper seal ring 10 in the first-stage aperture of the hole, the upper and lower end surfaces of the gland 9 respectively extend upward and downward to the protruding ring 11 surrounding the piston rod, and the protruding ring extending downward extends into the piston The rod passes through the second-level aperture of the hole 7 and presses the lower sealing ring 8; the piston rod of the hydraulic cylinder extends into the control hole 5 and the vertical section of the valve hole at the bottom of the lower valve block 3, and the first-level aperture of the control hole 5 Embedded in the upper part of the gland 9, the upper sealing ring 10 is located in the second-stage aperture of the control hole 5, and the upwardly extending convex ring of the gland 9 extends into the second-stage aperture of the control hole and presses the upper sealing ring 10; The valve block 2 and the flange cover plate 6 are locked with bolts, so that the lower valve block is pressed between the upper valve block and the flange cover plate (that is, the outer dimension of the lower valve block is smaller than that of the upper valve block) , At the same time, the gland presses the upper and lower sealing rings tightly. During specific implementation, in order to realize the bolt locking between the upper valve block 2 and the flange cover plate 6, bolt holes are provided around or at the four corners of the upper valve block 2, and bolt holes are provided around or at the four corners of the flange cover plate 6. The screw hole corresponding to the hole position, the bolt 12 passes through the bolt hole on the upper valve block 2 and is screwed in the screw hole on the flange cover plate 6; the above structure is a conventional technology in the art. The hydraulic cylinder 1 is a hydraulic cylinder with a hydraulic control on one side and a return spring on the other side of the piston, which is a well-known type of hydraulic cylinder in the hydraulic field.

Further, the part of the valve hole on the lower valve block 3 close to the contact surface of the upper and lower valve blocks is expanded into the lower hole section 13 of the valve seat, and the part of the valve hole on the upper valve block 2 close to the contact surface of the upper and lower valve blocks is expanded into The valve seat upper hole section 14, the upper part of the valve seat upper hole section is a variable diameter hole section 15, the valve seat lower hole section and the valve seat upper hole section cooperate to form a valve seat cavity, and the valve seat cavity is sealed with a valve seat 16. There are through holes on the seat 16, and the through holes communicate with the valve holes on the upper and lower valve blocks respectively. There is a sealing ball 17 that forms a sealing pair with the through hole port on the valve seat 16 in the variable diameter hole section 15, and the sealing ball 17 The upper part of the valve is located in the variable-diameter hole section to guide the movement of the sealing ball (to keep it aligned with the through-hole port. In order to realize that the guide valve core cannot be too thin, it must maintain a proper gap with the inner wall of the variable-diameter hole section 6). The spool 18 is provided with an axial through hole 19 (taking the axial direction of the valve hole including the variable diameter hole section as the axial direction), and the spool is also provided with a radial hole 20 communicating with the axial through hole. During specific manufacturing, the valve core 18 is in a stepped shape with a thick top and a thin bottom, and the radial hole 20 is opened on the thin part at the bottom of the valve core to make the pressure fluid flow more smoothly. The so-called sealing of the valve seat 16 in the valve seat cavity means that a sealing pair is formed between the valve seat 16 and the inner wall of the valve seat cavity or a seal is provided, which is easily understood and realized by those skilled in the art. The height (depth) of the lower hole section 13 of the valve seat and the upper hole section 14 of the valve seat are equal, so that the valve seat 16 is just in the middle of the upper and lower valve blocks, making the structure more reasonable.

Claims (6)

1. An ultra-high pressure relief valve, including an ultra-high pressure check valve and a hydraulic cylinder (1) for driving the opening and closing of the ultra-high pressure check valve; the ultra-high pressure check valve includes an upper valve block (2) and a lower The valve block (3), the upper valve block and the lower valve block are respectively provided with valve holes (4) communicating with each other, and the valve hole on the lower valve block (3) is a folded hole composed of a vertical section and a horizontal section. It is characterized in that: the lower bottom surface of the lower valve block is provided with a control hole (5) which communicates with the vertical section of the folded hole on the upper side and coincides with the axis, and the control hole (5) has at least three stages of successively smaller hole diameters from bottom to top A stepped hole is formed; the piston rod extension end of the cylinder barrel of the hydraulic cylinder is fixed with a flange cover plate (6), and the flange cover plate (6) is provided with a piston rod through hole (7), and the piston rod through hole (7) It is a stepped hole composed of at least three stages with the hole diameter gradually decreasing from top to bottom. The piston rod of the hydraulic cylinder passes through the piston rod hole (7) on the flange cover plate (6) and passes through the piston The piston rod of the hydraulic cylinder with the rod through the hole is covered with the lower sealing ring (8) which is located in the second-stage aperture of the piston rod through-hole, the gland (9) which falls into the first-stage aperture of the piston rod through-hole, and the upper sealing ring (9). The sealing ring (10), the upper and lower end surfaces of the gland (9) respectively extend upward and downward the protruding ring (11) around the piston rod, and the protruding ring extending downward extends into the piston rod through hole (7) and press the lower sealing ring (8); the piston rod of the hydraulic cylinder extends into the control hole (5) and the vertical section of the valve hole at the bottom of the lower valve block (3), and the control hole (5) The first-stage aperture is embedded in the upper part of the gland (9), the upper sealing ring (10) is located in the second-stage aperture of the control hole (5), and the upwardly extending convex ring of the gland (9) extends into the second hole of the control hole. and press the upper sealing ring (10); the upper valve block (2) and the flange cover plate (6) are locked with bolts, so that the lower valve block is pressed and fixed on the upper valve block and the flange cover plate Between, at the same time, the gland presses the upper and lower sealing rings tightly. 2. The ultra-high pressure relief valve according to claim 1, characterized in that: the hydraulic cylinder (1) is a hydraulic cylinder with hydraulic control on one side of the piston and return spring on the other side. 3. The ultra-high pressure relief valve according to claim 1 or 2, characterized in that: the valve hole on the lower valve block (3) is expanded into the lower hole section of the valve seat (13) near the contact surface of the upper and lower valve blocks ), the part of the valve hole on the upper valve block (2) close to the contact surface of the upper and lower valve blocks is expanded into the upper hole section of the valve seat (14), the upper part of the upper hole section of the valve seat is a variable diameter hole section (15), and the valve seat The lower hole section and the upper hole section of the valve seat cooperate to form a valve seat cavity, and a valve seat (16) is sealed in the valve seat cavity, and a through hole is opened on the valve seat (16), and the through hole is connected with the upper and lower valve blocks respectively. There is a sealing ball (17) that forms a sealing pair with the through-hole port on the valve seat (16) in the variable diameter hole section (15), and the upper part of the sealing ball (17) is located in the variable diameter hole section. The spool (18) used to guide the motion of the sealing ball has an axial through hole (19) on the spool (18), and a radial hole (20) communicating with the axial through hole is also opened on the spool . 4. The ultra-high pressure pressure relief valve according to claim 3, characterized in that: the spool (18) is in a stepped shape with a thick top and a thin bottom, and the radial hole (20) is opened in the detailed part of the lower part of the spool superior. 5. The ultra-high pressure relief valve according to claim 3, characterized in that: the height of the lower hole section (13) of the valve seat and the upper hole section (14) of the valve seat are equal. 6. The ultra-high pressure relief valve according to claim 4, characterized in that: the hole section (13) under the valve seat and the hole section (14) above the valve seat are equal in height.