Self-sealing anti-vibration stop valve

Abstract

The utility model provides a self-sealing anti-vibration stop valve which comprises a shell, a guide sleeve, a valve rod, a valve element and a valve seat, the valve seat is in clearance fit with the guide sleeve, a pressing ring is arranged on the step face of the valve seat and abuts against the step face of the valve seat, the pressing ring is in clearance fit with the inner ring face of the guide sleeve, and the end face of the valve seat abuts against the valve element. A spring is arranged between the step face of the deep hole II of the valve element and the step face of the deep hole I of the shell and is in a compressed state all the time, the ejector rod is installed in the guide sleeve, the valve rod is in clearance fit with the annular face of an inner hole of the plug cap, and the valve rod rotates to drive the ejector rod to rotate. The self-sealing anti-vibration structure enables the stop valve to well adapt to the working condition of long-term vibration, the valve cannot be opened by mistake, and meanwhile the problem that a traditional stop valve is poor in sealing performance due to the fact that hard sealing is used is solved.

Description

Technical Field

[0001] The utility model relates to a high-pressure hydrogen storage and supply system, in particular to a self-sealing anti-vibration stop valve structure. Background Art

[0002] Globe valves are inevitably used in various hydrogen systems. In existing technologies, globe valves generally consist of a valve body, a valve core, a valve seat, and a valve stem. The valve core and valve seat form a sealing pair. The valve stem, manually or through a drive mechanism, drives the valve core toward or away from the valve seat to open or close the globe valve. However, the hard seal structure used in these globe valves creates significant friction during the opening and closing process. After repeated opening and closing, the sealing surface inevitably wears, reducing sealing performance and shortening the valve's service life. Furthermore, wear can easily produce waste, contaminating the gas source. Furthermore, under long-term vibration conditions, the valve core can easily loosen, leading to valve leakage. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a stop valve which has good sealing performance, is not prone to wear and is resistant to vibration.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions: a self-sealing anti-vibration stop valve, including a shell, a guide sleeve, a valve stem, a valve core, and a valve seat. The shell has a deep hole I and an air inlet, and the side of the shell has an air outlet. The guide sleeve is placed in the deep hole I of the shell, and the end face of the guide sleeve is against the step surface of the deep hole I of the shell. The guide sleeve and the shell are threaded together, and the side of the guide sleeve has a through hole connected to the air outlet. A soft sealing device is provided between the guide sleeve and the shell, a valve seat is placed on the step surface of the inner hole of the guide sleeve, and the valve seat and the guide sleeve are clearance-fitted. A pressure ring is provided on the step surface of the valve seat and is against it, and the pressure ring and the inner ring surface of the guide sleeve are clearance-fitted. A soft sealing device is provided between the valve seat, the pressure ring and the guide sleeve, and the end face of the valve seat is against the valve core. The valve core is located in the inner hole of the pressure ring. There is a clearance fit between the inner ring surface of the pressure ring, the inside of the valve core is provided with a deep hole II, and there is a side hole on the side, the deep hole II is communicated with the side hole, there is a spring between the step surface of the deep hole II of the valve core and the step surface of the deep hole I of the shell, the spring is always in a compressed state, the valve core is pressed against the valve seat by the spring force and air pressure of the spring, and the upper end face of the valve core is also pressed against the push rod, the push rod is installed in the guide sleeve, and there is a threaded fit relationship between the push rod and the guide sleeve, there is a special-shaped hole inside the push rod, and the valve stem is matched with it inside the special-shaped hole, there is a plugging cap on the end face of the guide sleeve, the plugging cap is pressed against the guide sleeve, and there is a threaded fit between the plugging cap and the shell, the valve stem and the inner hole ring surface of the plugging cap are clearance fit, one end of the valve stem is deep in the special-shaped hole, and the rotation of the valve stem can drive the push rod to rotate, there is a soft sealing device between the plugging cap, the valve stem and the shell, and a handle is installed at one end of the valve stem.

[0005] Preferably, a friction reducing device is provided between the valve stem and the plug cap. Beneficial effects

[0006] The valve core, spring, pressure ring and valve seat designed in the utility model form a self-sealing anti-vibration structure. Even if the valve is in a long-term vibration working condition, the valve core will not come off the valve seat due to loosening.

[0007] The sealing structure designed by the utility model adopts a soft sealing structure, which can ensure the sealing performance of the valve after multiple opening and closing, and greatly increase the service life of the valve; a friction reduction device is added at the contact position of the valve stem and the plug cap, so that the friction force when the valve stem rotates is greatly reduced, and the opening and closing torque is correspondingly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the structure of the utility model in a closed state;

[0009] Figure 2 This is a schematic diagram of the structure of the utility model in the open state.

[0010] Among them, 1. handle; 2. plug cap; 3. friction reduction device; 4. soft sealing device; 5. housing; 6. push rod; 7. inner hole step surface of guide sleeve; 8. valve seat; 9. guide sleeve; 10. pressure ring; 11. spring; 12. deep hole I step surface of housing; 13. air inlet; 14. valve core; 15. air outlet; 16. valve stem. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0012] like Figure 1As shown, the embodiment of the utility model provides a self-sealing anti-vibration stop valve, including a housing 5, a guide sleeve 9, a valve stem 16, a valve core 14, and a valve seat 8. The housing 5 has a deep hole I and an air inlet 13, and the side of the housing 5 has an air outlet 15. The guide sleeve 9 is placed in the deep hole I of the housing 5, and the end face of the guide sleeve 9 abuts against the step surface 12 of the deep hole I of the housing. The guide sleeve 9 and the housing 5 are threaded together, and the side of the guide sleeve 9 has a through hole communicating with the air outlet 15. There is a soft sealing device 4 between the guide sleeve 9 and the housing 5, and a valve seat 8 is placed on the inner hole step surface 7 of the guide sleeve. There is a clearance fit between the valve seat 8 and the guide sleeve 9. There is a pressure ring 10 on the step surface of the valve seat 8 to abut it. There is a clearance fit between the pressure ring 10 and the inner ring surface of the guide sleeve 9. There is a soft sealing device 4 between the valve seat 8, the pressure ring 10 and the guide sleeve 9. The end face of the valve seat 8 abuts against the valve core 14. The valve core 14 is located in the inner hole of the pressure ring 10. The valve core 14 and the pressure ring 10 are in contact with each other. There is a clearance fit between the inner ring surfaces. There is a deep hole II inside the valve core 14 and a side hole on the side. The deep hole II is connected to the side hole. There is a spring 11 between the step surface 12 of the deep hole II of the valve core 14 and the step surface 12 of the deep hole I of the shell. The spring 11 is always in a compressed state. The valve core 14 is offset from the valve seat 8 by the spring force and air pressure of the spring 11. The upper end surface of the valve core 14 is also offset by the push rod 6. The push rod 6 is installed in the guide sleeve 9. The push rod 6 and the guide sleeve 9 are in a threaded fit relationship. There is a special-shaped hole inside the push rod 6, and a valve stem 16 cooperates with it inside the special-shaped hole. There is a blocking cap 2 on the end face of the guide sleeve 9, and the blocking cap 2 is in contact with the guide sleeve 9. The blocking cap 2 and the housing 5 are threaded together, and the valve stem 16 and the inner hole annular surface of the blocking cap 2 are clearance-fitted. One end of the valve stem 16 is deeply inserted into the special-shaped hole, and the rotation of the valve stem 16 can drive the push rod 6 to rotate. There is a soft sealing device 4 between the blocking cap 2, the valve stem 16 and the housing 5, and a handle 1 is installed at one end of the valve stem 16.

[0013] When the valve is in the closed state, the valve core 14 is subjected to the upward force of the spring 11 and the air pressure. At this time, the valve core 14 is not pushed by the push rod 6. The valve core 14 is subjected to the upward force and counteracts the valve seat 8, compressing the soft sealing device 4 between the pressure ring 10 and the valve seat 8. The valve core 14 is not pushed by the push rod 6. The valve core 14 is always subjected to an upward force. The combined force causes the valve core 14 to always compress the sealing device. The valve core 14, spring 11, pressure ring 10 and valve seat 8 form a self-sealing anti-vibration structure. Even if the valve is in a long-term vibration condition, the valve core will not loosen and leave the valve seat 8.

[0014] When the valve needs to be opened, the handle 1 is rotated to drive the valve stem 16 to rotate. Since there is a clearance fit between the valve stem 16 and the plug cap 2, the valve stem 16 only moves in the circumferential direction and does not move in the axial direction. The rotation of the valve stem 16 drives the push rod 6 to rotate. The push rod 6 and the guide sleeve 9 are threaded together, and the push rod 6 moves axially downward. The valve core 14 is subjected to a downward thrust. When the thrust is greater than the combined force of the spring 11 and the air pressure, the push rod 6 pushes the valve core 14 to move axially downward. The valve core 14 leaves the valve seat 8 and the valve opens. Figure 2 As shown, the arrow indicates the direction of medium flow. To close the valve, simply rotate handle 1 in the opposite direction. When valve core 14 is no longer pushed by push rod 6, it is subjected to the upward spring force and air pressure. The combined force of the spring and air pressure compresses valve core 14 against the soft seal 4 between pressure ring 10 and valve seat 8, closing the valve. During the valve opening and closing process, there is no wear between valve core 14 and valve seat 8, and the soft seal 4 ensures a longer service life.

[0015] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-sealing anti-vibration stop valve, comprising a housing, a guide sleeve, a valve stem, a valve core, and a valve seat, characterized in that: The shell has a deep hole I and an air inlet in it, and an air outlet on the side of the shell. The guide sleeve is placed in the deep hole I of the shell, and the end face of the guide sleeve is against the step surface of the deep hole I of the shell. The guide sleeve and the shell are threaded together, and the side of the guide sleeve has a through hole connected to the air outlet. A soft sealing device is provided between the guide sleeve and the shell. A valve seat is placed on the step surface of the inner hole of the guide sleeve, and the valve seat and the guide sleeve are clearance-fitted. A pressure ring is provided on the step surface of the valve seat and is against it, and the pressure ring and the inner ring surface of the guide sleeve are clearance-fitted. A soft sealing device is provided between the valve seat, the pressure ring and the guide sleeve. The end face of the valve seat is against the valve core, and the valve core is located in the inner hole of the pressure ring, and the valve core and the inner ring surface of the pressure ring are clearance-fitted. The valve core has a deep hole II inside and a side hole on the side. The deep hole II is communicated with the side hole. There is a spring between the step surface of the deep hole II of the valve core and the step surface of the deep hole I of the shell. The spring is always in a compressed state. The valve core is pressed against the valve seat by the spring force and air pressure of the spring. The upper end surface of the valve core is also pressed against a push rod. The push rod is installed in a guide sleeve. There is a threaded fit relationship between the push rod and the guide sleeve. There is a special-shaped hole inside the push rod, and a valve stem is matched with the special-shaped hole. There is a plugging cap on the end surface of the guide sleeve, which is pressed against the guide sleeve. There is a threaded fit between the plugging cap and the shell. The valve stem and the inner hole annular surface of the plugging cap are clearance fit. One end of the valve stem is deeply inserted into the special-shaped hole. The rotation of the valve stem can drive the push rod to rotate. There is a soft sealing device between the plugging cap, the valve stem and the shell. A handle is installed at one end of the valve stem.

2. A self-sealing anti-vibration stop valve according to claim 1, characterized in that: A friction reducing device is arranged between the valve stem and the plug cap.

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