Emergency cut-off valve of medium-pressure tank car

Abstract

The emergency cut-off valve comprises a valve body and an upper valve body, the interiors of the valve body and the upper valve body are communicated through a medium flow channel, a valve rod which penetrates out of the top and is driven by a shifting rod with the bottom capable of swinging to slide up and down is arranged in the upper valve body, the shifting rod is hinged to the valve body through a shaft, and the shaft penetrates out of the valve body to be connected with a rocker arm; the upper portion of the valve rod is sleeved with a valve clack which is used for blocking a medium flow channel opening of the upper valve body and slides up and down along the valve rod to achieve connection and disconnection of a medium flow channel, the lower end of the valve clack is provided with an overflowing spring which is arranged on the valve rod in a sleeving mode and is in a compressed state, and the other end of the overflowing spring is fixed to the valve rod. A groove is formed in the outer wall of the valve rod, a small medium flow channel is formed between the groove and the valve clack, and a valve rod gland used for achieving connection and disconnection of the small medium flow channel is fixed to the top end of the valve rod. The device has an overcurrent protection function, and can automatically adjust the flow velocity or flow when the flow velocity or flow of a hazardous chemical medium is too fast or too large.

Description

Technical Field

[0001] The utility model relates to an emergency cut-off valve for a medium-pressure tanker, belonging to the technical field of valves. Background Art

[0002] An emergency cut-off valve for vehicles is a safety protection valve installed on a hazardous chemical tank truck. It can be opened and closed on-site or at a certain distance through mechanical transmission and is used to transport hazardous chemical media. When the flow rate or flow volume of the hazardous chemical media is too fast or too large, the friction between the media and the valve or pipeline wall is likely to generate static electricity or sparks, leading to safety accidents. Therefore, there is a need to provide an emergency cut-off valve that can automatically adjust the flow rate or flow volume when the flow rate or flow volume of the hazardous chemical media is too fast or too large.

[0003] In addition, the valve length of the traditional emergency cut-off valve for vehicles is relatively long, resulting in a relatively long valve stem. After long-term use, there is a problem of valve stem deformation. Summary of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides an emergency cut-off valve for a medium-pressure tanker, which has an overcurrent protection function and can automatically adjust the flow rate or flow volume when the flow rate or flow volume of the hazardous chemical media is too fast or too large. In addition, the overall structure of the utility model is more compact, greatly shortening the length structure, reducing the length of the valve stem, and avoiding the problem of valve stem deformation due to long-term use.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0006] An emergency cut-off valve for a medium-pressure tanker includes a valve body internally connected through a medium flow channel and an upper valve body fixed to the upper end of the valve body. A valve stem is arranged inside the upper valve body, passing through the top and sliding up and down driven by a swingable lever at the bottom. The lever is hinged to the valve body through a shaft, and the shaft passes through the valve body and is connected to a rocker arm;

[0007] A valve flap for blocking the medium flow port of the upper valve body is sleeved on the upper part of the valve stem, and the medium flow channel is opened and closed by sliding up and down along the valve stem. A compression overcurrent spring is sleeved on the valve stem at the lower end of the valve flap, and the other end of the overcurrent spring is fixed to the valve stem; a groove is formed on the outer wall of the valve stem, forming a small medium flow channel with the valve flap, and a valve stem gland for opening and closing the small medium flow channel is fixed to the top of the valve stem;

[0008] A compression sealing spring for improving the sealing effect is sleeved on the lower part of the valve stem.

[0009] A further improvement of the technical solution of the utility model lies in that: a central hole through which the valve stem can slide up and down is arranged on the valve flap, and a sliding sleeve is fixed inside the central hole.

[0010] A further improvement of the technical solution of the present utility model lies in that: a pressure ring sleeved on the valve stem is fixed at the bottom of the valve flap, and a first sealing gasket is arranged at the position between the pressure ring and the valve flap and in contact with the medium flow port of the valve body.

[0011] A further improvement of the technical solution of the present utility model lies in that: the valve stem is a stepped rod with a smaller diameter at the upper part and a larger diameter at the lower part and having a shoulder, a fixing plate is sleeved on the upper part of the valve stem and the fixing plate is clamped at the shoulder position, a flow-through spring is located between the fixing plate and the pressure ring, and is a tapered spring with a smaller upper end and a larger lower end.

[0012] A further improvement of the technical solution of the present utility model lies in that: a fixing frame through which the valve stem passes and which provides guiding and supporting functions for the valve stem is arranged inside the upper valve body, a spring seat is arranged at the bottom of the fixing frame; the bottom end of the valve stem is a large end with an increased diameter; a sealing spring is located between the spring seat and the large end of the valve stem; the fixing frame and the spring seat are provided with a central hole through which the valve stem can slide up and down, and a sliding sleeve is fixed inside the central hole.

[0013] A further improvement of the technical solution of the present utility model lies in that: a dial rod pad is arranged between the bottom end of the valve stem and the dial rod.

[0014] A further improvement of the technical solution of the present utility model lies in that: a fastener is arranged at the upper part of the valve stem top and located above the valve stem gland, and a second sealing gasket for sealing is arranged at the bottom of the valve stem gland and in contact with the small medium flow port.

[0015] A further improvement of the technical solution of the present utility model lies in that: an O-ring is arranged on the contact surface between the upper valve body and the valve body, and a groove for accommodating the O-ring is formed on the valve body; a shear groove is formed on the outer wall of the valve body.

[0016] A further improvement of the technical solution of the present utility model lies in that: a bracket fixed on the outer wall of the valve body is arranged at the outer end of the shaft and located inside the rocker arm, one end of the bracket is upturned and a screw sleeve is arranged at the end, the other end is bent downward and a return spring is arranged between the other end and the rocker arm; a connecting frame is hinged at the outer end of the rocker arm, a second connecting shaft and a first connecting shaft are sequentially arranged at the outer end of the connecting frame, and the outer end of the second connecting shaft is inserted into the first connecting shaft and fixed by a fusible alloy, a joint fixed to one end of a steel wire rope is arranged at the outer end of the first connecting shaft, and the other end of the steel wire rope passes through the screw sleeve and is connected to the hand puller of the tanker control box.

[0017] A further improvement of the technical solution of the present utility model lies in that: a shaft sleeve for facilitating the rotation of the shaft is arranged in the hinge hole of the hinge shaft on the valve body.

[0018] Due to the adoption of the above technical solution, the technical progress obtained by the present utility model is:

[0019] The emergency cut-off valve for medium-pressure tank trucks provided by the present utility model includes a valve flap for realizing the on-off of the medium flow channel and a valve stem gland for realizing the on-off of the small medium flow channel. During the valve opening process, since the area of the contact part between the valve flap and the medium is large and the medium pressure received is large, if the valve flap is directly opened, a large opening operating force is required, which is not conducive to the operation of the staff. The provided valve stem gland has a small area and is subjected to a small acting force of the medium. Under the pushing action of the valve stem, the valve stem gland follows the valve stem to open first, while the valve flap does not open due to the large acting force of the medium. The external medium enters the medium flow channel inside the valve through the small medium flow channel, making the pressure inside and outside the valve balanced. At the same time, as the valve stem moves upward, the flow-through spring is continuously compressed, making the spring force gradually increase and exceed the acting force of the medium on the valve flap. Then, the valve flap moves upward under the action of the flow-through spring to open, completing the entire valve opening process, which can greatly reduce the operating force during the valve opening process and avoid the problem that parts are easily damaged due to the sudden entry of the medium into the valve interior.

[0020] The present utility model has an overcurrent protection function. During the process that the valve flap opens and the external medium enters the valve interior through the medium flow channel, when the medium flow rate is too fast, the too-fast flow rate makes the acting force on the back of the valve flap increase, which is greater than the spring force of the flow-through spring. The valve flap will compress the flow-through spring downward to reduce the valve opening and lower the flow rate of the medium, or make the valve flap close emergently to prevent the occurrence of dangerous accidents. The present utility model can adjust the flow rate by adjusting the preset spring amount of the flow-through spring.

[0021] The overall structure of the present utility model is more compact, greatly shortening the length structure and reducing the length of the valve stem, avoiding the problem that the valve stem is deformed due to long-term use. At the same time, the flow-through spring is a conical spring, small at the top and large at the bottom. Such a structure makes the spring rebound force increase not linearly but faster than linearly with the increase of pressure, that is, the greater the external pressure, the faster the rebound force increases. This can further shorten the length of the spring and thus further shorten the length of the valve stem.

[0022] A shear groove is machined on the outer wall of the valve body of the present utility model. When the tank truck has an accident and collides with the present utility model, the valve will break at the shear groove part, not affecting the sealing components above the valve flange part installed on the tank truck, preventing the medium leakage accident caused by the vehicle accident.

[0023] The outer end of the second connecting shaft of the present utility model is inserted into the interior of the first connecting shaft, and the cavity is filled with fusible alloy. The first connecting shaft and the second connecting shaft are fixed through the fusible alloy. When the ambient temperature exceeds 75 °C, the fusible alloy melts, causing the first connecting shaft and the second connecting shaft to disengage, and the valve closes emergently under the action of the return spring, playing a protective role. Description of the Drawings

[0024] Figure 1It is a schematic diagram of the present utility model after being sectioned along the central axis;

[0025] Figure 2 It is the present utility model Figure 1 Schematic diagram of the structure after removing the valve body;

[0026] Figure 3 It is the present utility model Figure 1 Schematic diagram in the A direction before sectioning;

[0027] Figure 4 It is a schematic diagram of the present utility model after being partially (upper part) sectioned along the central axis;

[0028] Wherein, 1. Valve body, 2. O-ring, 3. Upper valve body, 4. Valve stem, 5. Fixed plate, 6. Pressure ring, 7. First gasket, 8. Valve flap, 9. Fastener, 10. Valve stem gland, 11. Second gasket, 12. Overflow spring, 13. Fixed frame, 14. Spring seat, 15. Sealing spring, 16. Lever pad, 17. Lever, 18. Shaft, 19. Bushing, 20. Bracket, 21. Rocker arm, 22. Sleeve, 23. Joint, 24. First connecting shaft, 25. Second connecting shaft, 26. Connecting frame, 27. Return spring, 28. Shearing groove, 29. Fusible alloy. Specific embodiments

[0029] The following further describes the present utility model in detail with reference to embodiments:

[0030] As Figures 1-4 shown, a medium-pressure tanker emergency cut-off valve includes a valve body 1 at the bottom and an upper valve body 3 fixed to the upper end of the valve body 1. The inside of the valve body 1 and the upper valve body 3 is connected through a medium flow channel.

[0031] A fixed frame 13 is arranged inside the upper valve body 3. A central hole is arranged at the center of the fixed frame 13. The valve stem 4 passes through the central hole and slides up and down along the central hole. The fixed frame 13 provides guiding and supporting functions for the valve stem 4.

[0032] The top of the valve stem 4 passes through the upper valve body 3. A valve disc 8 is sleeved on the upper part of the valve stem 4 and can slide up and down along the valve stem 4. A central hole through which the valve stem 4 can slide up and down is provided on the valve disc 8, and a sliding sleeve is fixed in the central hole. The valve disc 8 is used to block the medium flow port of the upper valve body 3, and the on-off of the medium flow path is realized by sliding up and down. A retaining ring 6 sleeved on the valve stem 4 is fixed at the bottom of the valve disc 8. A first gasket 7 is arranged between the retaining ring 6 and the valve disc 8 and at the position in contact with the medium flow port of the valve body 1, which can better seal the medium flow port. An overflow spring 12 sleeved on the valve stem 4 is arranged at the bottom of the retaining ring 6. The overflow spring 12 is in a compressed state, with the upper end contacting the retaining ring 6 and the lower end contacting the fixing plate 5 on the valve stem 4. Specifically, the valve stem 4 is a stepped rod with a small diameter at the upper part, a large diameter at the lower part and a shoulder, and the bottom end of the valve stem 4 is a large end with an increased diameter. A fixing plate 5 is sleeved on the upper part of the valve stem 4 and the fixing plate 5 is clamped at the shoulder position.

[0033] The overflow spring 12 is a conical spring with a small upper end and a large lower end. Such a structure makes the spring rebound force increase not linearly but greater than linearly as the pressure increases, that is, the greater the external pressure, the faster the rebound force increases. This can shorten the length of the spring and thus shorten the length of the valve stem.

[0034] A groove is formed on the outer wall of the valve stem 4, forming a small medium flow path with the central hole of the valve disc 8. A valve stem gland 10 is fixed at the top of the valve stem 4, and the valve stem gland 10 is used to realize the on-off of the small medium flow path. A fastener 9 is arranged above the top of the valve stem 4 and located in the valve stem gland 10. A second gasket 11 is arranged at the bottom of the valve stem gland 10 and at the position in contact with the small medium flow port, which plays a sealing role.

[0035] A sealing spring 15 sleeved on the valve stem 4 is arranged at the bottom of the fixing frame 13. The sealing spring 15 is in a compressed state, providing assistance for sealing. The bottom of the fixing frame 13 is fixed to the spring seat 14. The sealing spring 15 is located between the spring seat 14 and the large end of the valve stem, with the top contacting the spring seat 14 and the bottom contacting the large end of the valve stem. Central holes through which the valve stem 4 can slide up and down are provided on the fixing frame 13 and the spring seat 14, and a sliding sleeve is fixed in the central holes.

[0036] A swingable lever 17 is provided at the bottom of the valve stem 4. The swinging of the lever 17 drives the up-and-down sliding of the valve stem 4. A lever pad 16 is provided between the bottom end of the valve stem 4 and the lever 17. The lever 17 is hinged to the valve body 1 through a shaft 18, and the shaft 18 passes through the valve body 1 and is connected to the rocker arm 21. Among them, a bushing 19 facilitating the rotation of the shaft 18 is provided in the hinge hole of the valve body 1 for the shaft 18. A bracket 20 is provided at the outer end of the shaft 18 inside the rocker arm 21. The bracket 20 is fixed to the outer wall of the valve body 1. One end of the bracket 20 tilts upward and a screw sleeve 22 is provided at the end, and a return spring 27 is provided between the other end that bends downward and the rocker arm 21. A connecting frame 26 is hinged to the outer end of the rocker arm 21. A second connecting shaft 25 and a first connecting shaft 24 are sequentially provided at the outer end of the connecting frame 26. The outer end of the second connecting shaft 25 is inserted into the first connecting shaft 24 and fixed by a fusible alloy 29. When the ambient temperature exceeds 75 °C, the fusible alloy 29 melts, causing the first connecting shaft 24 and the second connecting shaft 25 to disengage. Under the action of the return spring 27, the valve closes emergently, playing a protective role. A joint 23 is provided at the outer end of the first connecting shaft 24. The joint 23 is fixed to one end of the steel wire rope, and the other end passes through the screw sleeve 22 and is connected to the hand puller of the tanker control box. When the operator moves the hand puller, the rocker arm 21 can be driven to swing through the steel wire rope. Through the rotation of the shaft, the lever 17 is further driven to swing, realizing the up-and-down sliding of the valve stem 4.

[0037] An O-ring 2 is provided on the contact surface between the upper valve body 3 and the valve body 1, and a groove for accommodating the O-ring 2 is provided on the valve body 1.

[0038] A shear groove 28 is provided on the outer wall of the valve body 1. When the tanker has an accident and collides with the present utility model, the valve will break at the shear groove part, which does not affect the sealing components above the valve flange part loaded into the tanker, preventing the medium leakage accident caused by the vehicle accident.

[0039] Open the valve:

[0040] The operator moves the hand puller of the tanker control box, drives the joint 23 to move through the steel wire rope, and then drives the clockwise swing of the rocker arm 21 through the first connecting shaft 24, the fusible alloy 29, the second connecting shaft 25, and the connecting frame 26, drives the shaft 19 to rotate clockwise, and then drives the lever 17 to swing clockwise, pushing the valve stem 4 to slide upward. At this time, since the area of the contact part between the valve flap 8 and the medium is large, the medium pressure received is also large, so that the medium pressure received by the valve flap 8 is greater than the elastic force of the overflow spring 12, so the valve flap 8 does not open. And the valve stem gland 10 with a small area and a small acting force from the medium follows the valve stem 4 to open first under the pushing action of the valve stem 4. The external medium enters the internal medium flow path of the valve through the small medium flow path, making the pressure inside and outside the valve balanced. At the same time, as the valve stem 4 continues to move upward, the overflow spring 12 is continuously compressed, making the spring force gradually increase and exceed the acting force of the medium on the valve flap 8. Then the valve flap 8 moves upward under the action of the overflow spring 12 to open, completing the entire opening process of the valve. It can greatly reduce the operating force during the valve opening process and avoid the problem that the sudden entry of the medium into the valve interior causes the components to be easily damaged by impact.

[0041] Overcurrent protection:

[0042] During the valve opening process, when the flow rate or flow of the hazardous chemical medium is too fast, friction with the valve or pipeline wall is likely to generate static electricity or sparks, triggering safety accidents. Therefore, the present utility model has an overcurrent protection function. When the flow rate of the medium is too fast, the excessive flow rate makes the acting force on the back of the valve flap 8 increase, which is greater than the spring force of the overflow spring 12. The valve flap 8 will compress the overflow spring 12 downward to reduce the valve opening and the flow rate of the medium, or directly cause the valve flap to close emergently to prevent dangerous accidents from occurring.

[0043] The present utility model can adjust the flow rate by adjusting the preset spring amount of the overflow spring 12.

[0044] Closing the valve:

[0045] The operator restores the hand puller of the tanker control box, so that the steel wire rope no longer has tension. Under the pulling force of the return spring 27, the rocker arm 21 swings counterclockwise, driving the shaft 19 to rotate counterclockwise, and then driving the lever 17 to swing counterclockwise. At the same time, under the elastic force of the sealing spring 15, the valve stem 4 slides downward, and then drives the valve stem gland 10 and the valve flap 8 to move downward to close the medium flow port and the small medium flow port, realizing the closing of the valve.

Claims

1. A medium-pressure tanker emergency cut-off valve, comprising a valve body (1) with an internally connected medium flow channel and an upper valve body (3) fixed to the upper end of the valve body (1). Inside the upper valve body (3), there is a valve stem (4) that passes through the top and slides up and down driven by a swingable lever (17) at the bottom. The lever (17) is hinged to the valve body (1) through a shaft (18), and the shaft (18) passes through the valve body (1) and is connected to a rocker arm (21); characterized in that: An upper part of the valve stem (4) is sleeved with a valve flap (8) for blocking the medium flow port of the upper valve body (3) and realizing the on-off of the medium flow channel by sliding up and down along the valve stem (4). A lower end of the valve flap (8) is sleeved with an over-current spring (12) in a compressed state on the valve stem (4), and the other end of the over-current spring (12) is fixed to the valve stem (4); a groove is formed on an outer wall of the valve stem (4) to form a small medium flow channel with the valve flap (8), and a valve stem gland (10) for realizing the on-off of the small medium flow channel is fixed to a top end of the valve stem (4); A lower part of the valve stem (4) is sleeved with a sealing spring (15) in a compressed state for improving the sealing effect.

2. The emergency cut-off valve for a medium-pressure tanker according to claim 1, characterized in that: The valve flap (8) is provided with a central hole through which the valve stem (4) can slide up and down, and a sliding sleeve is fixed in the central hole.

3. The emergency cut-off valve for a medium-pressure tanker according to claim 1, characterized in that: A bottom of the valve flap (8) is fixed with a retaining ring (6) sleeved on the valve stem (4), and a first sealing gasket (7) is arranged at a position between the retaining ring (6) and the valve flap (8) and in contact with the medium flow port of the valve body (1).

4. The emergency cut-off valve for a medium-pressure tanker according to claim 3, characterized in that: The valve stem (4) is a stepped rod with a small upper diameter and a large lower diameter with a shoulder. An upper part of the valve stem is sleeved with a fixing plate (5), and the fixing plate (5) is clamped at the shoulder position. The over-current spring (12) is located between the fixing plate (5) and the retaining ring (6), and is a conical spring with a small upper end and a large lower end.

5. The emergency cut-off valve for a medium-pressure tanker according to claim 1, characterized in that: Inside the upper valve body (3), there is a fixing frame (13) through which the valve stem (4) passes and which provides guiding and supporting functions for the valve stem (4). A spring seat (14) is arranged at a bottom of the fixing frame (13); a bottom end of the valve stem (4) is a large end with an increased diameter; the sealing spring (15) is located between the spring seat (14) and the large end of the valve stem; the fixing frame (13) and the spring seat (14) are provided with central holes through which the valve stem (4) can slide up and down, and a sliding sleeve is fixed in the central holes.

6. The emergency cut-off valve for a medium-pressure tanker according to claim 1, characterized in that: A lever pad (16) is arranged between a bottom end of the valve stem (4) and the lever (17).

7. The emergency cut-off valve for a medium-pressure tanker according to claim 1, characterized in that: Above a top end of the valve stem (4) and located at an upper part of the valve stem gland (10), there is a fastener (9). A second sealing gasket (11) for sealing is arranged at a bottom of the valve stem gland (10) and at a position in contact with the small medium flow port.

8. The emergency cut-off valve for a medium-pressure tanker according to claim 1, characterized in that: An O-ring (2) is arranged on a contact surface between the upper valve body (3) and the valve body (1), and a groove for accommodating the O-ring (2) is formed on the valve body (1); a shear groove (28) is formed on an outer wall of the valve body (1).

9. The emergency cut-off valve for a medium-pressure tanker according to claim 1, wherein: A bracket (20) fixed to the outer wall of the valve body (1) is provided inside the outer end of the shaft (18) and located inside the rocker arm (21). One end of the bracket (20) is upturned and provided with a screw sleeve (22) at the end, and a return spring (27) is arranged between the other end which is bent downward and the rocker arm (21); a connecting frame (26) is hinged to the outer end of the rocker arm (21). A second connecting shaft (25) and a first connecting shaft (24) are sequentially arranged at the outer end of the connecting frame (26). The outer end of the second connecting shaft (25) is inserted into the first connecting shaft (24) and fixed by a fusible alloy (29). A joint (23) fixed to one end of a steel wire rope is arranged at the outer end of the first connecting shaft (24). The other end of the steel wire rope passes through the screw sleeve (22) and is connected to a hand puller of a tanker control box.

10. The emergency cut-off valve for a medium-pressure tanker according to claim 9, characterized in that: A bushing (19) facilitating the rotation of the shaft (18) is arranged in the hinge hole of the hinge shaft (18) on the valve body (1).

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