Large-drift-diameter gas cylinder valve

Abstract

The utility model discloses a large-drift-diameter gas cylinder valve, belongs to the technical field of valve structures, and provides a large-drift-diameter gas cylinder valve capable of effectively prolonging the service life of a valve. The large-drift-diameter gas cylinder valve comprises a shell, a cavity is formed in the shell, a gas inlet end, a control end and an exhaust end are arranged on the shell, and a configuration cavity communicated with the cavity is formed in the control end; a movable valve rod is arranged in the configuration cavity, the end, extending to the cavity, of the valve rod is connected with a valve through a piston body, the outer side face of the lower portion of the valve is a conical face, and the inner wall of the inner end of the air inlet channel is also a conical face and is suitable for being tightly attached to the outer side face of the lower portion of the valve. The hand wheel is in threaded fit with the control end. The valve in the valve body is designed to be of the conical surface structure and matched with the drift diameter with the conical surface, circumferential stress of the valve is transferred to the inclined direction, stress is effectively balanced, stress borne by all positions of the valve can be more uniform, and sealing reliability can be kept for a long time.

Description

Technical Field

[0001] The present application relates to the technical field of valve structures, and in particular to a large-diameter gas cylinder valve. Background Art

[0002] The inlet and outlet ports of the gas cylinder usually need to be equipped with a valve body structure to control whether the gas cylinder is connected to the outside world. Since the gas pressure in the gas cylinder is much higher than the external air pressure, the valve structure that plays a sealing role needs to withstand a large pressure difference. The valves inside the existing gas cylinder valves mostly adopt plane contact results. The center pressure is significantly greater than the edge pressure. Therefore, each time the valve is opened and closed, the center and edge parts will be subjected to reciprocating stress, which will affect the shape stability of the valve and reduce the reliability of the valve for long-term use. In addition, the larger the diameter, the shorter the reliable and practical life of the valve. Summary of the invention

[0003] The purpose of the present application is to provide a large-diameter gas cylinder valve that can effectively extend the service life of the valve.

[0004] To achieve the above objectives, the present application provides a large-diameter gas cylinder valve: comprising a shell, a chamber provided in the shell, an air inlet end, a control end and an air exhaust end provided on the shell, the air inlet end having an air inlet passage connected to the chamber, the control end having a configuration chamber connected to the chamber, a movable valve stem provided in the configuration chamber, the valve stem extending to one end of the chamber being connected to a valve through a piston body, the lower outer side surface of the valve being a conical surface, the inner end inner wall of the air inlet passage being also a conical surface, suitable for fitting tightly with the lower outer side surface of the valve, the end of the valve stem extending outside the shell being rotatably connected to a hand wheel, the hand wheel simultaneously being threadedly matched with the control end, the exhaust end having an exhaust passage connected to the chamber, forming an internal channel of the gas cylinder valve.

[0005] As a preferred embodiment, the valve stem includes a rod body, the upper end of the rod body has a limit ring, the bottom edge of the limit ring is provided with a sliding groove, the inner top surface of the handwheel has a clearance cavity, the outer side surface of the handwheel is provided with a pin hole connected to the clearance cavity, the handwheel has a cylindrical pin inserted in the pin hole, which is suitable for fitting with the sliding groove to form a sliding pair, and the inner wall of the pin hole close to the outer side surface of the handwheel is also provided with an internal thread, which is suitable for cooperating with a locking screw to limit the cylindrical pin in the pin hole, and the locking screw will only be unscrewed when the cylindrical pin needs to be removed.

[0006] Preferably, the piston body includes a piston rod, the lower end of the piston rod has a piston end, a step groove is formed between the top surface of the piston end and the outer side surface of the piston rod, the bottom surface of the piston end is provided with an engagement cavity, the inner wall of the engagement cavity has a conical ring, the inner wall of the conical ring is a positive cone, the top surface of the conical ring is a plane, the upper outer side surface of the valve has a conical groove suitable for engaging with the conical ring, so that the valve is easy and stable to install.

[0007] As a preferred embodiment, the upper end of the piston rod is provided with an insertion cavity, the inner wall of the insertion cavity is provided with a second internal thread, and the lower end of the rod body is provided with a screw suitable for cooperating with the second internal thread; the piston body also has an internal connecting channel connecting the insertion cavity and the bite cavity, and the outer side surface of the piston body also has an external connecting channel connecting the internal connecting channel, which is used to maintain the air pressure balance between the inner cavity of the piston body and the outside world.

[0008] As a preferred embodiment, a piston sleeve is further provided in the configuration cavity, which is suitable for being sleeved outside the rod body and the piston rod. The inner wall of the configuration cavity is provided with an inner groove located above the piston sleeve, and an elastic retaining ring is embedded in the inner groove. The outer side surface of the piston sleeve is provided with an outer groove, and an outer O-ring is sleeved in the outer groove. The outer side surface of the rod body is provided with an annular groove, and an inner O-ring is sleeved in the annular groove, which is suitable for pressing the inner wall of the piston sleeve; the outer side surface of the rod body is also provided with a flat groove for cooperating with tools such as a wrench to facilitate tightening the valve stem.

[0009] As a preferred embodiment, the shell is also provided with a pressure relief end, the pressure relief end has a pressure relief slide, the inner wall of the air inlet channel is provided with a pressure relief channel connected to the pressure relief slide, the pressure relief slide is slidably connected with a valve seat, the end face of the valve seat is provided with a sealing gasket, the pressure relief end is fixedly connected with a safety cap outside, the safety cap has a buffer cavity, the buffer cavity is provided with a spring suitable for applying pressure to the sealing gasket to block the pressure relief channel, the outer side of the safety cap is provided with an exhaust hole penetrating the buffer cavity, so as to avoid cylinder explosion due to excessive air pressure inside the gas cylinder valve.

[0010] As a preference, the outer side surface of the pressure relief end is provided with a second external thread suitable for cooperating with the inner wall thread of the safety cap, and the safety cap can well limit the position of the end of the spring.

[0011] Preferably, the inner wall of the outer end of the air inlet passage is provided with a first internal thread, the outer side surface of the air inlet end is an inverted cone, and the end surface diameter of the air inlet end is the smallest, making it easier to insert into an external pipe.

[0012] Preferably, the outer side surface of the exhaust end is provided with a first external thread for cooperating with the internal thread of the end of the external pipe.

[0013] Preferably, the outer side surface of the control end is provided with an external pitch-adjusting thread, and the inner wall of the handwheel is provided with an internal pitch-adjusting thread, which is suitable for cooperating with the external pitch-adjusting thread to convert the rotational motion of the handwheel into a lifting motion.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] (1) By designing the valve in the valve body into a conical structure and matching it with the bore which also has a conical surface, the circumferential force of the valve is transferred to the oblique direction, and the material thickness of the valve edge gradually increases toward the middle, which effectively balances the force. The stress on each part of the valve will be more even, making it less likely to deform, and the sealing reliability can be maintained for a long time, thereby extending the service life of the valve;

[0016] (2) By setting a cylindrical pin structure in the handwheel to limit the relative freedom of the valve stem, the valve stem can drive the valve to move without rotating relative to the housing. Therefore, the movement of the valve stem is simpler and more reliable. The structural design of the entire valve body is compact, and the working efficiency and stability are also better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a plan cross-sectional view of the large-diameter gas cylinder valve.

[0018] Figure 2 For the large diameter gas cylinder valve Figure 1 Plane sectional view of the section line at AA.

[0019] Figure 3 It is a plan cross-sectional view of the shell of the large-diameter gas cylinder valve.

[0020] Figure 4 It is a plan cross-sectional view of the internal movable parts of the large-diameter gas cylinder valve.

[0021] Figure 5 It is a front view of the valve stem of the large-diameter gas cylinder valve.

[0022] Figure 6 It is a plan cross-sectional view of the piston body of the large-diameter gas cylinder valve.

[0023] In the figure: 1. Shell; 101. Chamber; 110. Inlet end; 111. Inlet channel; 112. Pressure relief channel; 113. First internal thread; 114. Inverted cone; 120. Control end; 121. Configuration chamber; 122. Internal slot; 123. External pitch-adjusting thread; 130. Exhaust end; 131. Exhaust channel; 132. First external thread; 140. Pressure relief end; 141. Pressure relief slideway; 142. Second external thread; 150. Circlip; 160. External O-ring; 2. Handwheel; 201. Make way chamber; 202. Pin hole; 203. Internal thread of hole; 204. Internal pitch-adjusting thread; 3. Cylindrical pin; 4. Set screw; 5. Valve stem; 501. Limit ring; 502. Rod body; 503. Flat groove; 504. Slide groove; 505. Ring groove; 506. Screw; 520. Inner O-ring; 6. Piston sleeve; 601. Outer groove; 7. Piston body; 710. Piston rod; 711. Step groove; 712. Insertion cavity; 713. Second inner thread; 714. Inner connecting channel; 715. Outer connecting channel; 720. Piston end; 721. Engagement cavity; 722. Conical ring; 723. Positive cone surface; 724. Plane; 8. Valve; 9. Safety cap; 901. Buffer cavity; 902. Exhaust hole; 903. Spring; 904. Valve seat; 905. Sealing gasket. DETAILED DESCRIPTION

[0024] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0027] The terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0028] like Figure 1-6 The large-diameter gas cylinder valve shown in the figure comprises a shell 1 having an internal chamber 101. The shell 1 is usually made of a corrosion-resistant alloy material. An integral air inlet end 110, a control end 120, an exhaust end 130 and a pressure relief end 140 are arranged on the shell 1. The four ports extend in different directions. Usually, the adjacent ports are 90° apart. The air inlet end 110 has an air inlet passage 111 in communication with the chamber 101, through which the fluid enters the valve body. The inner wall of the outer end of the air inlet passage 111 is provided with a first An internal thread 113 is usually used for threaded connection with the exhaust end 130 of the gas cylinder. The outer side surface of the inlet end 110 is an inverted cone 114, that is, the end surface diameter of the inlet end 110 is the smallest, so that the inlet end 110 can also have the ability to be quickly inserted into an external pipe. The exhaust end 130 has an exhaust channel 131 connected to the chamber 101, and the fluid in the valve body is discharged from it. The outer side surface of the exhaust end 130 is provided with a first external thread 132 for threaded connection with the end of the discharge pipe.

[0029] The pressure relief end 140 is provided with a pressure relief slide 141, and the inner wall of the air inlet channel 111 is provided with a pressure relief channel 112 connected to the pressure relief slide 141. When the pressure in the air inlet channel 111 is too high, excess fluid will enter the pressure relief slide 141 through the pressure relief channel 112, thereby reducing the pressure in the air inlet channel 111. A valve seat 904 is slidably connected to the pressure relief slide 141. The outer side surface of the valve seat 904 fits the inner wall of the pressure relief slide 141 and is restricted to slide only along the extension direction of the pressure relief slide 141. A rubber sealing gasket 905 is provided on the end surface of the valve seat 904, which can be tightly attached to the end of the pressure relief channel 112 by deformation. The pressure relief end 140 is fixedly connected to a safety helmet 9 for covering the open end of the pressure relief end 140. A second external thread 142 is provided on the outer side of the pressure relief end 140 for cooperating with the inner wall thread of the safety helmet 9. After tightening, the safety helmet 9 can maintain good installation stability. The safety helmet 9 has a buffer chamber 901 connected to the pressure relief slide 141. A spring 903 is provided in the buffer chamber 901. The spring 903 extends into the pressure relief slide 141 for applying pressure to the sealing gasket 905 to block the pressure relief channel 112. An exhaust hole 902 is provided on the outer side of the safety helmet 9 to pass through the buffer chamber 901, and excess fluid, usually gas, is discharged from the valve body through this.

[0030] The control end 120 has a configuration cavity 121 connected to the chamber 101, which serves as the main installation space for the movable parts. A movable valve stem 5 is arranged in the configuration cavity 121, which mainly performs translational motion along the axis. The valve stem 5 includes a rod body 502. One end of the valve stem 5 extending to the chamber 101 is connected to a valve 8 through a piston body 7. The valve 8 is made of rubber material and can produce good compression and adhesion characteristics through deformation. The specific structure of the piston body 7 includes a piston rod 710. The lower end of the piston rod 710 has a piston end 720. The piston end 720 and the piston rod 710 are an integrated structure and are both made of corrosion-resistant alloy materials. Since the diameter of the piston end 720 is larger, a step groove 711 is formed between the top surface of the piston end 720 and the outer side surface of the piston rod 710. The piston end 720 is a piston end 720. 0 is provided with an upwardly extending engaging cavity 721, the inner wall of the engaging cavity 721 is provided with a conical ring 722, the inner wall of the conical ring 722 is a positive conical surface 723, which is actually the side of a truncated cone, with a small upper end and a large lower end, and the top surface of the conical ring 722 is a plane 724. Therefore, the cross-sectional property of the conical ring 722 is a right triangle with horizontal right-angled sides. The upper outer side surface of the valve 8 has a corresponding conical groove, which just engages with the conical ring 722. In this way, the valve 8 inserted into the bottom of the piston end 720 from below is very stable and not easy to fall off. The lower part of the valve 8 has a larger diameter than the upper part, and the lower outer side surface of the valve 8 is a conical surface. The inner wall of the inner end of the intake channel 111 is also a conical surface, which can fit tightly with the lower outer side surface of the valve 8, thereby cutting off the connection between the intake channel 111 and the exhaust channel 131.

[0031] The upper end of the piston rod 710 is also provided with a downwardly extending insertion cavity 712, and the inner wall of the insertion cavity 712 is provided with a second internal thread 713. The lower end of the rod body 502 is provided with a screw 506 for threadably cooperating with the second internal thread 713 to allow the piston body 7 and the valve stem 5 to move synchronously; the piston body 7 is also provided with an internal connecting channel 714 connecting the insertion cavity 712 and the bite cavity 721, and the outer side surface of the piston body 7 is also provided with an external connecting channel 715 connecting the internal connecting channel 714, that is, the insertion cavity 712 and the bite cavity 721 are connected to the outside through the internal connecting channel 714 and the external connecting channel 715, so that when the valve stem 5 and the valve 8 are installed on the piston body 7, no additional installation resistance will be generated due to the increase in the internal air pressure of the piston body 7.

[0032] The configuration chamber 121 is also provided with a piston sleeve 6, which can be simultaneously sleeved on the rod body 502 and the piston rod 710. The piston sleeve 6 is made of a metal material with a lower hardness than the housing 1, and can replace the housing 1 to rub against the rod body 502 or the piston rod 710. It is convenient to replace after wear, which effectively prolongs the service life of the housing 1 and reduces the maintenance cost. The inner wall of the configuration chamber 121 is provided with an inner groove 122 located above the piston sleeve 6, and an elastic retaining ring 150 is embedded in the inner groove 122, which is used to limit the piston sleeve 6 in the configuration chamber 121. The outer side of the piston sleeve 6 is provided with An outer groove 601 is provided, and an outer O-ring 160 is sleeved inside the outer groove 601 to ensure the sealing between the piston sleeve 6 and the housing 1. An annular groove 505 is provided on the outer side of the rod body 502, and an inner O-ring 520 is sleeved inside the annular groove 505 to press the inner wall of the piston sleeve 6, thereby ensuring the airtightness between the rod body 502 and the piston sleeve 6; a flat groove 503 is also provided on the outer side of the rod body 502, and there is usually a pair of flat grooves 503, which are symmetrical about the axis of the rod body 502, so as to facilitate the cooperation between the wrench tool and the rod body 502, thereby facilitating the tightening of the entire valve stem 5 and the piston body 7.

[0033] One end of the valve stem 5 extending outside the housing 1 is rotatably connected to a handwheel 2, which is usually set to an external hexagonal shape for easy force bearing. The upper end of the rod body 502 also has an integrated limiting ring 501, and the bottom edge of the limiting ring 501 is provided with a coaxial annular sliding groove 504. The inner top surface of the handwheel 2 has a clearance cavity 201, which just accommodates the limiting ring 501. The outer side surface of the handwheel 2 is provided with a pin hole 202 connected to the clearance cavity 201. The extension direction of the pin hole 202 is skewed and perpendicular to the axial direction of the rod body 502. The handwheel 2 is inserted with a cylindrical pin 3 in the pin hole 202. There are two pin holes 202, and there are also two corresponding cylindrical pins 3, and the two cylindrical pins 3 are mutually Parallel, and used to fit with the sliding groove 504 to form a sliding pair. The outer side surface of the control end 120 is provided with an external pitch adjusting thread 123, and the inner wall of the handwheel 2 is provided with an internal pitch adjusting thread 204, which is used to cooperate with the external pitch adjusting thread 123. After the handwheel 2 is simultaneously engaged with the control end 120 thread, the selection movement of the handwheel 2 itself can be converted into the lifting movement of the valve stem 5 relative to the housing 1, thereby realizing the opening and closing action of the valve body. The inner wall of the pin hole 202 close to the outer side surface of the handwheel 2 is also provided with an internal hole thread 203, which is used to cooperate with the set screw 4 to limit the cylindrical pin 3 in the pin hole 202, and can effectively prevent the cylindrical pin 3 from slipping out of the pin hole 202.

[0034] Working principle: The gas cylinder valve can work after connecting the gas cylinder to the pipeline. By turning the hand wheel 2, due to the blocking effect of the cylindrical pin 3 on the limit ring 501 at the top of the hand wheel 2, the valve stem 5 will passively move up or down, thereby forcing the valve 8 to lift up to open the valve, or press downward to close the valve. Regardless of whether the valve 8 is in a blocked state, when the air pressure in the air inlet channel 111 is greater than the pre-pressure of the spring 903, the sealing gasket 905 will be lifted, and excess gas will overflow from the safety cap 9, thereby avoiding damage to the gas cylinder valve due to excessive internal pressure.

[0035] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A large-diameter gas cylinder valve, characterized in that: The invention comprises a housing (1), wherein the housing (1) has a chamber (101), the housing (1) is provided with an air intake end (110), a control end (120) and an air exhaust end (130), the air intake end (110) has an air intake passage (111) in communication with the chamber (101), the control end (120) has a configuration chamber (121) in communication with the chamber (101), a movable valve stem (5) is provided in the configuration chamber (121), and the valve stem (5) extends to the chamber One end of the valve (101) is connected to a valve (8) through a piston body (7), the lower outer side surface of the valve (8) is a conical surface, and the inner wall of the inner end of the air inlet passage (111) is also a conical surface, suitable for tightly fitting with the lower outer side surface of the valve (8), and one end of the valve stem (5) extending outside the shell (1) is rotatably connected to a hand wheel (2), and the hand wheel (2) is simultaneously threadedly matched with the control end (120), and the exhaust end (130) has an exhaust passage (131) connected to the chamber (101).

2. The large-diameter gas cylinder valve according to claim 1, characterized in that: The valve stem (5) comprises a rod body (502), the upper end of the rod body (502) is provided with a limiting ring (501), the bottom edge of the limiting ring (501) is provided with a sliding groove (504), the inner top surface of the hand wheel (2) is provided with a clearance cavity (201), the outer side surface of the hand wheel (2) is provided with a pin hole (202) connected to the clearance cavity (201), the hand wheel (2) is provided with a cylindrical pin (3) inserted in the pin hole (202), suitable for fitting with the sliding groove (504) to form a sliding pair, and the inner wall of the pin hole (202 close to the outer side surface of the hand wheel (2) is also provided with an inner hole thread (203), suitable for cooperating with a set screw (4) to limit the cylindrical pin (3) in the pin hole (202).

3. The large-diameter gas cylinder valve according to claim 2, characterized in that: The piston body (7) comprises a piston rod (710), the lower end of the piston rod (710) has a piston end (720), a step groove (711) is formed between the top surface of the piston end (720) and the outer side surface of the piston rod (710), the bottom surface of the piston end (720) is provided with a bite cavity (721), the inner wall of the bite cavity (721) has a cone ring (722), the inner wall of the cone ring (722) is a positive cone surface (723), the top surface of the cone ring (722) is a plane (724), and the upper outer side surface of the valve (8) has a cone groove suitable for biting with the cone ring (722).

4. The large-diameter gas cylinder valve according to claim 3, characterized in that: The upper end of the piston rod (710) is provided with an insertion cavity (712), and the inner wall of the insertion cavity (712) is provided with a second internal thread (713). The lower end of the rod body (502) has a screw (506) suitable for threaded cooperation with the second internal thread (713); the piston body (7) also has an internal connecting channel (714) connecting the insertion cavity (712) and the bite cavity (721), and the outer side surface of the piston body (7) is also provided with an external connecting channel (715) connecting the internal connecting channel (714).

5. The large-diameter gas cylinder valve according to claim 4, characterized in that: A piston sleeve (6) is also arranged in the configuration cavity (121) and is suitable for being sleeved outside the rod body (502) and the piston rod (710). An inner groove (122) located above the piston sleeve (6) is provided on the inner wall of the configuration cavity (121), and an elastic retaining ring (150) is embedded in the inner groove (122). An outer groove (601) is provided on the outer side surface of the piston sleeve (6), and an outer O-ring (160) is sleeved in the outer groove (601). An annular groove (505) is provided on the outer side surface of the rod body (502), and an inner O-ring (520) is sleeved in the annular groove (505) and is suitable for pressing the inner wall of the piston sleeve (6). A flat groove (503) is also provided on the outer side surface of the rod body (502).

6. The large-diameter gas cylinder valve according to any one of claims 1 to 5, characterized in that: The shell (1) is also provided with a pressure relief end (140), the pressure relief end (140) has a pressure relief slide (141), the inner wall of the air inlet channel (111) is provided with a pressure relief channel (112) connected to the pressure relief slide (141), a valve seat (904) is slidably connected to the pressure relief slide (141), and a sealing gasket (905) is provided on the end surface of the valve seat (904), a safety cap (9) is fixedly connected to the outside of the pressure relief end (140), the safety cap (9) has a buffer cavity (901), a spring (903) is provided in the buffer cavity (901), and is suitable for applying pressure to the sealing gasket (905) to block the pressure relief channel (112), and an exhaust hole (902) penetrating the buffer cavity (901) is provided on the outer side of the safety cap (9).

7. The large-diameter gas cylinder valve according to claim 6, characterized in that: The outer side surface of the pressure relief end (140) is provided with a second external thread (142) suitable for matching with the inner wall thread of the safety helmet (9).

8. The large-diameter gas cylinder valve according to any one of claims 1 to 5, characterized in that: The inner wall of the outer end of the air inlet channel (111) is provided with a first internal thread (113); the outer side surface of the air inlet end (110) is an inverted cone surface (114); and the end surface diameter of the air inlet end (110) is the smallest.

9. The large-diameter gas cylinder valve according to claim 8, characterized in that: The outer side surface of the exhaust end (130) is provided with a first external thread (132).

10. The large-diameter gas cylinder valve according to any one of claims 1 to 5, characterized in that: The outer side surface of the control end (120) is provided with an external pitch-adjusting thread (123), and the inner wall of the hand wheel (2) is provided with an internal pitch-adjusting thread (204) suitable for cooperating with the external pitch-adjusting thread (123).

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