Nitrogen-filled safety valve

Abstract

The nitrogen filling safety valve comprises a valve body, a valve core and a base, the valve body has a hydraulic section and a gas pressure section, the valve core is movably arranged in the hydraulic section of the valve body, and the base is threadedly connected to the gas pressure section of the valve body, characterized in that: the base is internally formed with a nitrogen filling port at one end and a mounting cavity at the other end, the nitrogen filling port and the mounting cavity are communicated through a vent hole formed in the base, the mounting cavity is internally arranged with a plug assembly which is simultaneously inserted into the vent hole, the mounting cavity is formed with an expansion space on one end surface of the base, the expansion space is outwardly expanded so that the inner diameter of part of the mounting cavity is increased, the expansion space is arranged with a compression ring which serves as the support of one end of the plug assembly, and the compression ring is detachably connected with the base. The nitrogen filling safety valve has the beneficial effects that the compression ring is used to replace the clamping spring, the compression ring and the base are assembled together in a threaded connection mode, the plug assembly can be replaced by only detaching the compression ring when the plug assembly is replaced, the base does not need to be replaced together, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic support technology in coal mines, and in particular to a nitrogen-filled safety valve. Background Technology

[0002] With the large-scale implementation and development of hydraulic supports in liquefied gas, oilfield extraction, and coal mining, the requirements for hydraulic equipment are becoming increasingly stringent. This places further demands on the safety valves of protective equipment, especially on their service life and reliability. Taking coal mine hydraulic supports as an example, when pressure from the top of the hydraulic support causes a passive condition, whether the safety valve can withstand high pressure and unload the load quickly, fully, and stably in a short time directly affects the service life and support safety of the hydraulic support.

[0003] Publication (Announcement) No.: CN206571509U discloses a nitrogen safety valve for rapid nitrogen filling, including a valve body, a valve core, and a base. The valve body includes a hydraulic section and a pneumatic section. The base is tightened onto the pneumatic section of the valve body, and the valve core isolates the hydraulic section and the pneumatic section. The base is provided with a push rod and a nitrogen filling port. The nitrogen filling port is coaxial with the push rod. One end of the push rod is inserted into the nitrogen filling port, and the other end extends toward the valve core. A spring is sleeved on the push rod. A movable plate and a retaining ring are connected inside the base. The retaining ring is engaged with the inner wall of the base. The movable plate is located on the side of the retaining ring near the base and is connected to the push rod. One end of the spring abuts against the movable plate, and the other end is connected to the push rod. This nitrogen safety valve uses a plug assembly consisting of a push rod, spring, and movable plate to seal the nitrogen filling port. However, this plug is movable; it opens during nitrogen filling and seals the filling port at other times to prevent nitrogen leakage and pressure imbalance within the valve. A retaining spring serves as a limiting support for the plug assembly, keeping it within the base. The retaining spring is snapped onto the base. While this method allows for assembly, it also prevents the retaining spring from separating from the base. Consequently, if the plug assembly fails, the entire base must be replaced. Since the base is a connecting component with a longer lifespan than other components, replacing it along with the plug assembly would result in excessive costs. Utility Model Content

[0004] This invention aims to overcome the shortcomings of the prior art by providing a nitrogen-filled safety valve to solve the aforementioned problems.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: This nitrogen-filled safety valve includes a valve body, a valve core, and a base. The valve body has a hydraulic section and a pneumatic section. The valve core is movably disposed in the hydraulic section of the valve body. The base is threadedly connected to the pneumatic section of the valve body. The feature is that: a nitrogen filling port is formed at one end and an installation cavity is formed at the other end in the base. The nitrogen filling port and the installation cavity are interconnected through a vent hole formed in the base. A plug assembly is provided in the installation cavity and inserted into the vent hole. An expansion space is formed on one end face of the base, which expands outward to increase the inner diameter of part of the installation cavity. A pressure ring is provided in the expansion space as a support for one end of the plug assembly. The pressure ring is detachably connected to the base.

[0006] Further improvements include the formation of an internal thread structure on the inner circumferential surface of the extended space and an external thread structure on the outer circumferential surface of the pressure ring, enabling a detachable connection between the pressure ring and the base via a threaded connection.

[0007] Further improvements include the formation of two symmetrically distributed pinch heads on the end face of the pressure ring that does not contact the plug assembly.

[0008] Further improvements were made to the plug assembly, which includes a push rod, a movable plate, a spring, and a seal. One end of the push rod is inserted into the vent hole and can move, while the other end passes through the movable plate and out of the pressure ring. The movable plate can move on the push rod. The spring is fitted on the push rod, with one end supported on the movable plate and the other end supported on the boss of the push rod. The seal is fitted on the push rod to prevent gas from escaping through the vent hole in non-human venting or automatic gas replenishment scenarios.

[0009] Further improvements include a sealing element comprising a connecting ring and a sealing ring. The connecting ring is fitted onto the push rod, with one end face contacting the boss of the push rod and the other end face forming an inwardly recessed, ring-shaped slot. The sealing ring is inserted into the slot and partially exposed outside the slot, contacting the bottom surface of the mounting cavity.

[0010] Further improvements include a connecting part arranged in a ring, an insertion part on one end face of the connecting part, and a contact part on the other end face. A through hole for the push rod to pass through is formed at the center of the connecting part. The insertion part is inserted into the slot, and the contact part contacts the bottom surface of the mounting cavity.

[0011] Further improvements include the formation of a ring-shaped, inwardly folded covering portion at the through-hole of the connecting part.

[0012] Further improvements include the formation of a circular groove on the outer periphery of the contact part, with a retaining ring disposed within the groove.

[0013] The beneficial effects of this utility model are: 1. This utility model uses a pressure ring instead of a snap ring. The pressure ring and the base are assembled together by a threaded connection. Therefore, when replacing the plug assembly, the pressure ring can be removed to replace the plug assembly without replacing the base together, thus reducing costs. Similarly, the pressure ring can also be used for a long time. 2. This utility model enhances the rigidity, deformation resistance, and overall structural stability of the sealing ring by adding a retaining ring to the sealing ring. This limits the excessive compression and creep of the rubber. The retaining ring itself bears most of the pressure and fastening force, ensuring that the rubber part works stably within the designed compression range, thereby maintaining effective sealing contact pressure for a long time and preventing it from flipping when affected by gas. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 A magnified view of part A in the diagram. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings: Referring to the attached diagram: This nitrogen-filled safety valve includes a valve body 1, a valve core 2, and a base 3. The valve body 1 has a hydraulic section and a pneumatic section. The valve core 2 is movably disposed in the hydraulic section of the valve body 1. The base 3 is threadedly connected to the pneumatic section of the valve body 1. The base 3 has a nitrogen filling port 31 at one end and a mounting cavity 32 at the other end. The nitrogen filling port 31 and the mounting cavity 32 are interconnected through a vent hole 33 formed in the base 3. A plug assembly 4 is disposed in the mounting cavity 32 and inserted into the vent hole 33. An expansion space 321 is formed on one end face of the mounting cavity 32, which expands outward to increase the inner diameter of part of the mounting cavity 32. A pressure ring 5 is disposed in the expansion space 321 as a support for one end of the plug assembly 4. The pressure ring 5 is detachably connected to the base 3. The principle of this utility model is that an expansion space 321 is formed inside the mounting cavity 32. The expansion space 321 extends inward from the inlet end of the mounting cavity 32. In this way, the pressure ring 5 set in the expansion space 321 can enter from the inlet end, which is more convenient than the assembly method of assembling the snap ring. Moreover, the expansion space 321 makes the mounting cavity have a stepped structure, so after the pressure ring 5 is installed in the expansion space 321, it will only stay in the expansion space 321 and will not increase its own entry depth uncontrollably. The pressure ring 5 makes contact with the plug assembly 4 when it is fully installed in the expansion space 321. At the same time, the pressure ring 5 is detachable, so when the plug assembly 4 needs to be replaced, the pressure ring 5 can be removed and the plug assembly 4 can be replaced without replacing the base 3, thereby reducing costs. Similarly, the pressure ring 5 can also be used for a long time.

[0016] The inner circumferential surface of the extended space 321 has an internal thread structure, and the outer circumferential surface of the pressure ring 5 has an external thread structure, so that the pressure ring 5 and the base 3 can be detachably connected by means of threaded connection. That is, the pressure ring 5 and the base 3 can be detachably connected by means of threaded connection. This method can not only ensure assembly stability, but also make disassembly and assembly convenient, which can be achieved by simply turning a knob.

[0017] Two symmetrically distributed pinch heads 51 are formed on the end face of the pressure ring 5 that does not contact the plug assembly 4. The pinch heads 51 make it convenient for the user to screw the pressure ring 5, that is, to pinch the pinch heads 51 when screwing, which increases the convenience of installing the pressure ring 5. The pinch heads 51 are fixed to the pressure ring 5 by welding.

[0018] The plug assembly 4 includes a push rod 41, a movable plate 42, a spring 43, and a seal 44. One end of the push rod 41 is inserted into the vent hole 33 and is movable, while the other end passes through the movable plate 42 and exits the pressure ring 5. The movable plate 42 can move on the push rod 41. The spring 43 is fitted onto the push rod 41, with one end supported on the movable plate 42 and the other end supported on the protrusion of the push rod 41. The seal 44 is fitted onto the push rod 41 to prevent gas from escaping through the vent hole 33 in non-human venting or automatic gas replenishment scenarios. The push rod 41 moves during nitrogen filling and replenishment. After the movement, the part that was originally inserted into the vent hole 33 will gradually move away, and the push rod 41 and the vent hole 33 are in clearance fit. When the liquid is drained, the moving plate 42 will be affected by the liquid pushing the valve core 2 and the valve core pushing the gas, and will move. After the movement, the spring 43 will compress and apply force on the boss of the push rod 41, so that the seal 44 will be squeezed and deformed. After the compression and deformation, the sealing effect can be increased. The spring 43 mainly plays the role of force transmission and reset. Force transmission means that the seal 44 is squeezed and deformed, and reset means that the push rod 41 is reset after nitrogen filling and liquid drainage.

[0019] The sealing element 44 includes a connecting ring 441 and a sealing ring 442. The connecting ring 441 is fitted onto the push rod 41, with one end face contacting the boss of the push rod 41 and the other end face forming an inwardly recessed, ring-shaped slot 4411. The sealing ring 442 is inserted into the slot 4411 and partially exposed outside the slot 4411, contacting the bottom surface of the mounting cavity 32. The connecting ring 441 is fitted onto the push rod 41 and contacts the boss portion of the push rod, so that it can move with the push rod 41 during both nitrogen filling and liquid drainage. The connecting ring 441 connects to the sealing ring 442 via the slot 4411, which allows the sealing ring 442 to move as well. During drainage, the sealing ring 42 contacts the bottom surface of the mounting cavity 32 and is squeezed by the movement of the push rod 41. This compression deforms the sealing ring 42, thereby increasing the sealing effect. Since the connecting ring 441 is made of 3Cr13 material, it can provide a sturdy support backing for the sealing ring 442, preventing it from being squeezed into the tiny gaps between parts under system pressure.

[0020] The sealing ring 442 includes a connecting portion 4421 arranged in a ring, an insertion portion 4422 located on one end face of the connecting portion 4421, and a contact portion 4423 located on the other end face. A through hole for the push rod 41 to pass through is formed at the center of the connecting portion 4421. The insertion portion 4422 is inserted into the slot 4411, and the contact portion 4423 contacts the bottom surface of the mounting cavity 32. The sealing ring 4422 can have both the insertion portion 4422 and the contact portion 4423 through the connecting portion 4421. The connecting portion 4421 can fit against the end face of the connecting ring 441, so that the sealing ring 442 and the connecting ring 441 have a good assembly effect after assembly. The insertion portion 4422 is inserted into the slot 4411, and the two are transition fit, that is, they need to be squeezed in when entering, which can ensure assembly stability. The contact portion 4423 is used as a sealing structure.

[0021] A covering part 44211 is formed at the through hole of the connecting part 4421, which is arranged in a ring and folded inward. The covering part 44211 covers the push rod 41 when the push rod 41 passes through the through hole of the connecting part 4421. Since the sealing ring 442 is made of rubber, the covering part 44211 is also made of the same material. Therefore, frictional resistance can be generated when it comes into contact with the push rod 41. At the same time, the covering part 44211 also enters the through hole of the connecting ring 441 through which the push rod passes. In this way, the stable connection between the connecting ring 441 and the push rod 41 can be ensured under the action of frictional resistance.

[0022] A circular groove 44231 is formed on the outer peripheral surface of the contact portion 4423, and a retaining ring 6 is disposed within the groove 44231. The groove 44231 allows the retaining ring 6 to be disposed on the contact portion 4423. The retaining ring 6 serves as a reinforcing structure, that is, when acting on the contact portion 4423, it can enhance the rigidity, deformation resistance, and overall structural stability of the contact portion 4423, thereby limiting excessive compression and creep of the rubber. The retaining ring 6 itself bears most of the pressure and fastening force, ensuring that the rubber part works stably within the designed compression range, thus maintaining effective sealing contact pressure for a long time, and will not flip over when affected by gas.

[0023] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A nitrogen-filled safety valve, comprising a valve body (1), a valve core (2), and a base (3), wherein the valve body (1) has a hydraulic section and a pneumatic section, the valve core (2) is movably disposed in the hydraulic section of the valve body (1), and the base (3) is threadedly connected to the pneumatic section of the valve body (1), characterized in that: The base (3) has a nitrogen filling port (31) at one end and an installation cavity (32) at the other end. The nitrogen filling port (31) and the installation cavity (32) are interconnected through a vent hole (33) formed in the base (3). A plug assembly (4) is provided in the installation cavity (32) and inserted into the vent hole (33). An expansion space (321) is formed on one end face of the base (3) of the installation cavity (32) to expand outward and increase the inner diameter of part of the installation cavity (32). A pressure ring (5) is provided in the expansion space (321) as a support for one end of the plug assembly (4). The pressure ring (5) is detachably connected to the base (3).

2. The nitrogen-filled safety valve according to claim 1, characterized in that: The inner circumferential surface of the extended space (321) is formed with an internal thread structure, and the outer circumferential surface of the pressure ring (5) is formed with an external thread structure, so that the pressure ring (5) and the base (3) can be detachably connected by means of threaded connection.

3. The nitrogen-filled safety valve according to claim 2, characterized in that: Two symmetrically distributed pinch heads (51) are formed on the end face of the pressure ring (5) that does not contact the plug assembly (4).

4. The nitrogen-filled safety valve according to claim 1, characterized in that: The plug assembly (4) includes a push rod (41), a movable plate (42), a spring (43), and a seal (44). One end of the push rod (41) is inserted into the vent hole (33) and is movable, and the other end passes through the movable plate (42) and out of the pressure ring (5). The movable plate (42) is movable on the push rod (41). The spring (43) is fitted on the push rod (41) and one end is supported on the movable plate (42), while the other end is supported on the boss of the push rod (41). The seal (44) is fitted on the push rod (41) to prevent gas from being discharged from the vent hole (33) in non-human venting or automatic gas replenishment scenarios.

5. The nitrogen-filling safety valve according to claim 4, characterized in that: The sealing element (44) includes a connecting ring (441) and a sealing ring (442). The connecting ring (441) is fitted onto the push rod (41), with one end face contacting the boss of the push rod (41) and the other end face forming an inwardly recessed and ring-shaped slot (4411). The sealing ring (442) is inserted into the slot (4411) and partially exposed outside the slot (4411) in contact with the bottom surface of the mounting cavity (32).

6. The nitrogen-filling safety valve according to claim 5, characterized in that: The sealing ring (442) includes a ring-shaped connecting part (4421), an insertion part (4422) on one end face of the connecting part (4421), and a contact part (4423) on the other end face. A through hole for the push rod (41) to pass through is formed at the center of the connecting part (4421). The insertion part (4422) is inserted into the slot (4411), and the contact part (4423) contacts the bottom surface of the mounting cavity (32).

7. The nitrogen-filling safety valve according to claim 6, characterized in that: The connecting part (4421) has a covering part (44211) formed in a ring and folded inward at the through hole.

8. The nitrogen-filled safety valve according to claim 6, characterized in that: A groove (44231) is formed on the outer peripheral surface of the contact portion (4423), and a retaining ring (6) is provided in the groove (44231).

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