A bottle valve for non-refillable welding cylinders

Abstract

The utility model discloses a kind of bottle valves for welding steel cylinders with non-repeated filling, including valve body, the communication cavity is formed in valve body, for connecting the air inlet passage of steel cylinder, and air outlet passage, and communication cavity is respectively communicated air inlet passage and air outlet passage;Valve stem assembly is arranged in communication cavity, valve stem assembly includes the control valve stem with communication cavity thread connection, and valve core is inserted on control valve stem, and the outer periphery of valve core forms a limit boss, limit boss is clamped on control valve stem, and control valve stem is provided with elastic element, and elastic element extrudes valve core downwards;When control valve stem is in first position, control valve stem drives valve core to abut air inlet passage, to cut off air inlet passage and communication cavity, when control valve stem drops from first position to second position, control valve stem breaks limit boss, valve core is under the action of elastic element and abuts air inlet passage, when control valve stem rises from second position to third position, valve core is under the action of the thrust of air inlet passage and away from air inlet passage.

Description

Technical Field

[0001] This utility model relates to the field of bottle valve technology, specifically to a bottle valve for non-refillable welded steel cylinders. Background Technology

[0002] High-pressure gas cylinders are indispensable pressure vessels in industries, medical fields, and scientific research. The performance of their core component, the cylinder valve, directly determines the safety of storage, transportation, and use. The cylinder valves widely used in the market are mainly refillable cylinder valves, which are connected to the cylinder mouth by threads and can be opened and closed multiple times and refilled repeatedly.

[0003] While existing refillable bottle valves can be used for multiple fillings, they rely entirely on external inspection procedures and the standardization of personnel operations. The valve body and threaded connection are prone to metal fatigue and stress corrosion under cyclic pressure and frequent loading and unloading, which may lead to structural failure. Furthermore, the sealing interface gradually wears down during repeated opening and closing, which may cause leakage and poses a significant risk. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a non-refillable welded steel cylinder valve.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A non-refillable welded steel cylinder valve includes a valve body, wherein the valve body forms a communicating cavity for connecting the gas inlet channel and the gas outlet channel of the steel cylinder, and the communicating cavity is connected to the gas inlet channel and the gas outlet channel respectively. A valve stem assembly is provided inside the communicating cavity. The valve stem assembly includes a control valve stem that is threadedly connected to the communicating cavity and a valve core inserted on the control valve stem. A limiting boss is formed on the outer periphery of the valve core. The limiting boss is engaged on the control valve stem. An elastic element is provided inside the control valve stem. The elastic element presses the valve core downward. The control valve stem has at least a first position, a second position, and a third position within the communicating cavity. When the control valve stem is in the first position, it drives the valve core to abut against the air intake channel to isolate the air intake channel from the communicating cavity. When the control valve stem descends from the first position to the second position, it breaks the limiting boss, and the valve core abuts against the air intake channel under the action of the elastic element. When the control valve stem rises from the second position to the third position, the valve core moves away from the air intake channel under the thrust of the air intake channel to connect the air intake channel and the air outlet channel.

[0006] Preferably, when the control valve stem is in the third position, when the force exerted by the elastic element on the valve core is less than the thrust exerted by the air inlet channel on the valve core, the valve core moves away from the air inlet channel. When the force exerted by the elastic element on the valve core is greater than the thrust exerted by the air inlet channel on the valve core, the valve core abuts against the air inlet channel. Through the above improvements, since the limiting boss has been destroyed, the upward movement of the control valve stem can no longer drive the valve core to rise together. When there is pressure inside the gas cylinder, gas rushes out from the air inlet channel, generating an upward thrust on the bottom of the valve core. When this thrust is greater than the spring force, the valve core is lifted, and the airflow can enter the connecting cavity and flow out from the outlet channel. When the outlet is closed or the pressure inside the cylinder decreases, the gas thrust disappears or decreases. When the spring force is greater than the gas thrust, the spring will immediately push the valve core back, resealing the air inlet channel. Furthermore, when the gas in the cylinder is exhausted and the internal pressure is the same as atmospheric pressure, the spring force always presses the valve core tightly against the air inlet channel, preventing external gas from being added to the cylinder.

[0007] Preferably, after the limiting boss breaks, the force exerted by the elastic element on the valve core gradually decreases as the control valve rod rises. With the above improvement, when the limiting boss breaks, the force exerted by the elastic element on the valve core can be adjusted by controlling the position of the control valve rod to match the internal air pressure of the bottle, thereby controlling the bottle valve to open or close.

[0008] Preferably, the bottom of the control valve stem is threadedly connected to a fixed seat, and the limiting boss is engaged between the fixed seat and the control valve stem. The control valve stem and the fixed seat form a sliding channel for the valve core to slide. Through the above improvement, the fixed seat and the control valve stem are threaded together, so that the control valve stem and the fixed seat press against the limiting boss from their respective ends. When the valve core abuts against the intake channel and the control valve stem continues to move downward, it will cut off the limiting boss, so that the valve core can disengage from the control valve stem and slide in the sliding channel.

[0009] Preferably, the top of the fixed seat forms a supporting plane for supporting the limiting boss, and the control valve stem has a pressing protrusion for pressing the limiting boss. With the above improvements, the pressing protrusion inside the control valve stem begins to contact the upper surface of the limiting boss of the valve core. As the control valve stem continues to move downward, the pressing protrusion applies a huge downward pressure to the limiting boss. Since the lower surface of the limiting boss is firmly held by the supporting plane of the fixed seat, it cannot move downward. When the control valve stem moves downward to a certain position, the limiting boss will be cut off.

[0010] Preferably, the limiting boss is provided with several breakage notches at intervals. Through the above improvements, the notches greatly reduce the cross-sectional area and strength of the limiting boss, so that it can be neatly sheared under a relatively small and controllable torque.

[0011] Preferably, the limiting boss forms a concave breakage groove. Through the above improvements, the thickness of the remaining material can be controlled by the groove depth, and the shear force required for breakage can be precisely set.

[0012] Preferably, the valve stem assembly is made of plastic. Through the above improvements, the manufacturing cost is reduced and it will not chemically react with the gas inside the bottle.

[0013] Preferably, the valve core includes a sliding rod and a sealing head formed at the end of the sliding rod. The limiting boss is formed on the sliding rod, and the fixing seat has a mounting groove for the sliding rod to be inserted. The sealing head abuts against the air inlet channel to isolate the air inlet channel and the air outlet channel. Through the above improvements, the convenience of the valve core in the assembly process is increased.

[0014] Preferably, the outer periphery of the control valve stem forms a plurality of sealing grooves, and a sealing ring is provided in the sealing groove. The sealing ring abuts against the cavity wall of the communicating cavity. Through the above improvements, the sealing performance between the control valve stem and the communicating cavity is increased, and leakage is avoided.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: A valve stem assembly is installed within the cavity. This assembly includes a control valve stem threaded into the communicating cavity and a valve core inserted into the control valve stem. A limiting boss forms on the outer periphery of the valve core, which engages with the control valve stem. An elastic element is installed inside the control valve stem, pressing the valve core downwards. When the valve is not in use at the factory, the control valve stem is in its highest position (first position), causing the valve core to press against the air inlet channel, thus isolating the air inlet and outlet channels. When the user uses the valve, the control valve stem rotates downwards to the second position. During this downward movement, the valve core is already against the air inlet channel. As the control valve stem descends, the inner wall structure of the control valve stem crushes (shears) the limiting boss on the valve core, allowing the valve core to detach from the control valve stem and move independently. Under the thrust of the elastic element, the valve core remains pressed against the air inlet, and the valve remains closed. In the closed state, the user rotates the control valve rod in the opposite direction, raising it to the third position. Since the limit boss has been destroyed, the upward movement of the control valve rod can no longer drive the valve core to rise together. When there is pressure inside the gas cylinder, gas rushes out from the inlet channel, generating an upward thrust on the bottom of the valve core. When this thrust is greater than the spring force, the valve core is lifted, allowing airflow to enter the connecting cavity and flow out from the outlet channel, opening the valve. When the outlet is closed or the pressure inside the cylinder decreases, the gas thrust disappears or decreases. When the spring force is greater than the gas thrust, the spring will immediately push the valve core back, resealing the inlet channel, and the valve closes. When the gas in the cylinder is depleted and the internal pressure is the same as atmospheric pressure, the spring force always keeps the valve core pressed tightly against the valve seat, preventing gas from being filled into the cylinder from the outside. This avoids multiple fillings and prevents gas cylinder leakage due to structural wear, ensuring safety during use. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the valve stem assembly of this utility model; Figure 4 This is an exploded view of the valve stem assembly of this utility model; Figure 5 This is a schematic diagram of the structure of the fixing base of this utility model; Figure 6 This is a schematic diagram of the valve core structure of this utility model; In the diagram: 1. Valve body; 2. Connecting cavity; 3. Inlet passage; 4. Outlet passage; 5. Valve stem assembly; 1.1 Control valve stem; 1.2 Valve core; 1.3 Limiting boss; 1.4 Fixed seat; 1.5 Sliding channel; 1.6 Elastic element; 2.1 Supporting plane; 2.2 Pressing protrusion; 2.3 Break notch; 2.4 Break groove; 3.1 Sliding rod; 3.2 Sealing head; 3.3 Mounting groove; 4.1 Sealing groove; 4.2 Sealing ring; 5.1 Knob; 5.2 Air outlet; 5.3 Abutment seat; 5.4 Air outlet; 5.5 Rotating protrusion; Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0019] like Figure 1-6 As shown, a non-refillable welded steel cylinder valve includes a valve body 1, and a connecting cavity 2 is formed inside the valve body 1 for connecting the gas inlet channel 3 and the gas outlet channel 4 of the steel cylinder, and the connecting cavity 2 is connected to the gas inlet channel 3 and the gas outlet channel 4 respectively.

[0020] Specifically, a valve stem assembly 5 is provided in the communicating cavity 2. The valve stem assembly 5 includes a control valve stem 1.1 threadedly connected to the communicating cavity 2, and a valve core 1.2 inserted into the control valve stem 1.1. A limiting boss 1.3 is formed on the outer periphery of the valve core 1.2. The limiting boss 1.3 is locked onto the control valve stem 1.1, and an elastic element 1.6 is provided in the control valve stem 1.1. The elastic element 1.6 presses the valve core 1.2 downward.

[0021] Furthermore, the control valve stem 1.1 has at least a first position, a second position, and a third position within the connecting cavity 2. When the control valve stem 1.1 is in the first position, it drives the valve core 1.2 to abut against the air intake channel 3, thereby isolating the air intake channel 3 from the connecting cavity 2. When the control valve stem 1.1 descends from the first position to the second position, it breaks the limiting boss 1.3, and the valve core 1.2 abuts against the air intake channel 3 under the action of the elastic element 1.6. When the control valve stem 1.1 rises from the second position to the third position, the valve core 1.2 moves away from the air intake channel 3 under the thrust of the air intake channel 3, thereby connecting the air intake channel 3 and the air outlet channel 4.

[0022] Additionally, when the control valve stem 1.1 is in the third position, if the force exerted by the elastic element 1.6 on the valve core 1.2 is less than the thrust exerted by the intake channel 3 on the valve core 1.2, the valve core 1.2 moves away from the intake channel 3. If the force exerted by the elastic element 1.6 on the valve core 1.2 is greater than the thrust exerted by the intake channel 3 on the valve core 1.2, the valve core 1.2 abuts against the intake channel 3.

[0023] When the user first uses the bottle valve, the control valve stem 1.1 is rotated downwards to the second position. During this downward movement, the valve core 1.2 is already abutting against the air intake channel 3. As the control valve stem 1.1 descends, the inner wall structure of the control valve stem 1.1 crushes (shears) the limiting boss 1.3 on the valve core 1.2, allowing the valve core 1.2 to move independently from the control valve stem 1.1. The valve core 1.2 is located beneath the elastic element 1.6. Under the thrust, it is still pressed against the air intake channel 3. At this time, the valve is still in the closed state. The user rotates the control valve rod 1.1 in the opposite direction and raises the control valve rod 1.1 to the third position. Since the limiting boss 1.3 has been destroyed, the upward movement of the control valve rod 1.1 can no longer drive the valve core 1.2 to rise together. When there is pressure in the gas cylinder, the gas rushes out from the air intake channel 3 and generates an upward thrust on the bottom of the valve core 1.2. When this thrust is greater than the spring force, the valve core 1.2 is lifted up, and the airflow can enter the connecting cavity 2 and flow out from the air outlet channel 4. The valve opens. When the air outlet is closed or the pressure in the cylinder decreases, the gas thrust disappears or decreases. When the spring force is greater than the gas thrust, the spring will immediately push the valve core 1.2 back and reseal the air intake channel 3, and the valve closes.

[0024] When the gas in the cylinder is depleted and the internal pressure is the same as atmospheric pressure, the spring force always presses the valve core 1.2 tightly against the valve seat. When the cylinder is filled with gas through the outlet channel 4, it will exert downward pressure on the valve core 1.2, making it firmly against the inlet channel 3, thus preventing the cylinder from being filled from the outside. This avoids multiple fillings and prevents the cylinder from leaking due to structural wear, ensuring safety during use.

[0025] In addition, after the limiting boss 1.3 breaks, the force exerted by the elastic element 1.6 on the valve core 1.2 gradually decreases as the control valve rod 1.1 rises. When the limiting boss 1.3 breaks, the force exerted by the elastic element 1.6 on the valve core 1.2 can be adjusted by controlling the position of the control valve rod 1.1 to match the internal air pressure of the bottle, thereby controlling the opening or closing of the bottle valve.

[0026] In some other embodiments, there is no need to retract the control valve stem 1.1. When the limiting boss 1.3 breaks, if the thrust of the air inlet channel 3 is greater than the spring force, the valve core 1.2 is lifted, and the airflow enters the connecting cavity 2 and flows out from the air outlet channel 4, thus opening the valve. When the air outlet is closed or the pressure inside the bottle decreases, the gas thrust disappears or decreases. When the spring force is greater than the gas thrust, the spring will immediately push the valve core 1.2 back, resealing the air inlet channel 3, and the valve will close.

[0027] Preferably, the valve body 1 has an abutment seat 5.3 inside, the air inlet channel 3 is formed on the abutment seat 5.3, and the valve body 1 has an air outlet 5.4 on the side, the air outlet 5.4 is connected to an air outlet nozzle 5.2, and the air outlet 5.4 and the air outlet nozzle 5.2 form an air outlet channel 4, thereby realizing the delivery of gas.

[0028] like Figure 1-6 As shown, to further explain the specific structure of the valve stem assembly 5, the bottom of the control valve stem 1.1 is threadedly connected to a fixed seat 1.4, and a limiting boss 1.3 is engaged between the fixed seat 1.4 and the control valve stem 1.1. The control valve stem 1.1 and the fixed seat 1.4 form a sliding channel 1.5 for the valve core 1.2 to slide. By utilizing the threaded engagement between the fixed seat 1.4 and the control valve stem 1.1, the control valve stem 1.1 and the fixed seat 1.4 press against the limiting boss 1.3 from both ends. When the valve core 1.2 abuts against the intake channel 3 and the control valve stem 1.1 continues to move downward, it will cut off the limiting boss, allowing the valve core 1.2 to detach from the control valve stem 1.1 and slide within the sliding channel 1.5. The sliding channel 1.5 ensures the smoothness and stability of the valve core 1.2 during its up-and-down sliding process.

[0029] Furthermore, the top of the fixed seat 1.4 forms a supporting plane 2.1 for supporting the limiting boss 1.3, and the control valve stem 1.1 has a pressing protrusion 2.2 for pressing the limiting boss 1.3. The pressing protrusion 2.2 inside the control valve stem 1.1 begins to contact the upper surface of the limiting boss 1.3 of the valve core 1.2. As the control valve stem 1.1 continues to move downward, the pressing protrusion 2.2 applies a huge downward pressure to the limiting boss 1.3. Since the lower surface of the limiting boss 1.3 is firmly held by the supporting plane 2.1 of the fixed seat 1.4, it cannot move downward. When the control valve stem 1.1 moves downward to a certain distance, the limiting boss 1.3 will be cut off.

[0030] The valve core 1.2 includes a sliding rod 3.1 and a sealing head 3.2 formed at the end of the sliding rod 3.1. A limiting boss 1.3 is formed on the sliding rod 3.1, and a mounting groove 3.3 for the sliding rod 3.1 to be inserted is formed on the fixing seat 1.4. The sealing head 3.2 abuts against the air inlet channel 3 to isolate the air inlet channel 3 and the air outlet channel 4, which increases the convenience of the valve core 1.2 in the assembly process.

[0031] In addition, the limiting boss 1.3 is provided with several breakage notches 2.3 at intervals. The notches greatly reduce the cross-sectional area and strength of the limiting boss 1.3, so that it can be neatly sheared under a relatively small and controllable torque.

[0032] Preferably, the limiting boss 1.3 has a recessed breakage groove 2.4. The thickness of the remaining material can be controlled by the depth of the breakage groove 2.4, and the shear force required for breakage can be precisely set.

[0033] Preferably, the valve stem assembly 5 is made of plastic, which reduces manufacturing costs and prevents chemical reactions with the gas inside the bottle.

[0034] Preferably, the end of the control valve stem 1.1 is configured as a knob 5.1 for hand rotation, thereby improving the convenience of the control valve stem 1.1 during rotation.

[0035] like Figure 1-6 As shown, a further explanation of the cooperation between the control valve stem 1.1 and the connecting cavity 2 is provided: the outer periphery of the control valve stem 1.1 forms several sealing grooves 4.1, and a sealing ring 4.2 is provided in the sealing groove 4.1. The sealing ring 4.2 abuts against the cavity wall of the connecting cavity 2, which increases the sealing between the control valve stem 1.1 and the connecting cavity 2 and avoids leakage.

[0036] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A valve for a non-refillable welded steel cylinder, characterized in that, Includes a valve body (1), wherein a connecting cavity (2) is formed inside the valve body (1) for connecting the gas cylinder's inlet channel (3) and outlet channel (4), and the connecting cavity (2) is connected to the inlet channel (3) and outlet channel (4) respectively; A valve stem assembly (5) is provided in the communicating cavity (2). The valve stem assembly (5) includes a control valve stem (1.1) threadedly connected to the communicating cavity (2) and a valve core (1.2) inserted on the control valve stem (1.1). A limiting boss (1.3) is formed on the outer periphery of the valve core (1.2). The limiting boss (1.3) is engaged on the control valve stem (1.1). An elastic element (1.6) is provided in the control valve stem (1.1). The elastic element (1.6) presses the valve core (1.2) downward. The control valve stem (1.1) has at least a first position, a second position, and a third position in the connecting cavity (2). When the control valve stem (1.1) is in the first position, the control valve stem (1.1) drives the valve core (1.2) to abut against the air intake channel (3) to isolate the air intake channel (3) and the connecting cavity (2). When the control valve stem (1.1) descends from the first position to the second position, the control valve stem (1.1) breaks the limiting boss (1.3), and the valve core (1.2) abuts against the air intake channel (3) under the action of the elastic element (1.6). When the control valve stem (1.1) rises from the second position to the third position, the valve core (1.2) moves away from the air intake channel (3) under the thrust of the air intake channel (3) to connect the air intake channel (3) and the air outlet channel (4).

2. The valve for a non-refillable welded steel cylinder according to claim 1, characterized in that: When the control valve stem (1.1) is in the third position, when the force exerted by the elastic element (1.6) on the valve core (1.2) is less than the thrust exerted by the intake channel (3) on the valve core (1.2), the valve core (1.2) moves away from the intake channel (3). When the force exerted by the elastic element (1.6) on the valve core (1.2) is greater than the thrust exerted by the intake channel (3) on the valve core (1.2), the valve core (1.2) abuts against the intake channel (3).

3. The valve for a non-refillable welded steel cylinder according to claim 1, characterized in that: After the limiting boss (1.3) breaks, the force exerted by the elastic element (1.6) on the valve core (1.2) gradually decreases as the control valve stem (1.1) rises.

4. A non-refillable welded steel cylinder valve according to claim 1, characterized in that: The bottom of the control valve stem (1.1) is threadedly connected to a fixed seat (1.4), and the limiting boss (1.3) is engaged between the fixed seat (1.4) and the control valve stem (1.1). The control valve stem (1.1) and the fixed seat (1.4) form a sliding channel (1.5) for the valve core (1.2) to slide.

5. A non-refillable welded steel cylinder valve according to claim 4, characterized in that: The top of the fixed seat (1.4) forms a supporting plane (2.1) for supporting the limiting boss (1.3), and the control valve stem (1.1) forms a pressing protrusion (2.2) for pressing the limiting boss (1.3).

6. A non-refillable welded steel cylinder valve according to claim 1, characterized in that: The limiting boss (1.3) has several break notches (2.3) arranged at intervals.

7. A non-refillable welded steel cylinder valve according to claim 1, characterized in that: The limiting boss (1.3) has a recessed break groove (2.4).

8. A non-refillable welded steel cylinder valve according to claim 1, characterized in that: The valve stem assembly (5) is made of plastic.

9. A non-refillable welded steel cylinder valve according to claim 4, characterized in that: The valve core (1.2) includes a sliding rod (3.1) and a sealing head (3.2) formed at the end of the sliding rod (3.1). The limiting boss (1.3) is formed on the sliding rod (3.1), and the mounting base (1.4) is formed with a mounting groove (3.3) for the sliding rod (3.1) to be inserted. The sealing head (3.2) abuts against the air inlet channel (3) to isolate the air inlet channel (3) and the air outlet channel (4).

10. A non-refillable welded steel cylinder valve according to claim 1, characterized in that: The outer periphery of the control valve stem (1.1) forms several sealing grooves (4.1), and a sealing ring (4.2) is provided in the sealing groove (4.1), the sealing ring (4.2) abutting against the cavity wall of the connecting cavity (2).

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