A shut-off valve that closes at a certain flow rate

Abstract

This invention discloses a shut-off valve that automatically closes when the flow rate is below a certain threshold, relating to the field of valve technology. The shut-off valve includes a valve body tube, with a connecting pipe fixedly connected to the top of the valve body tube. By incorporating a first sliding block, when the gas flow rate to the left side of the valve body tube is less than a set value, the gas enters the interior of the sealing block through a cylindrical and arc-shaped groove. This drives the first sliding block to move towards the sensor head. The sensor head then detects the pressure sensor, triggering an electronically controlled timer to start a countdown. After a set duration, the timer starts a drive motor, causing the cylindrical gear to rotate clockwise, thus moving the sealing block towards the bottom and completely cutting off the gas path. This effectively solves the problem of long-term accumulation of small-flow gas leaks reaching the lower explosive limit, potentially leading to fires and explosions. It proactively provides gas leakage protection in unattended scenarios.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a shut-off valve that closes at a set time when the flow rate is less than a certain threshold. Background Technology

[0002] Currently, gas leak concentration alarms are widely used in places where flammable and explosive gas media such as coal gas, liquefied petroleum gas, and natural gas are used. However, safety accidents such as explosions and fires still frequently occur in these places, especially in some individually owned catering businesses.

[0003] Patent CN216923349U discloses a timed gas shut-off valve, including a valve body, a return spring, a valve stem, a valve seat, a sealing nut, and a mechanical drive device. The valve body has a valve stem mounting hole in the center of the bottom, a lubricating bushing is installed in the hole, and a return spring is installed outside the hole. The valve stem is installed in the valve stem mounting hole of the valve body and contacts the return spring. The valve seat is installed on the valve seat mounting platform inside the valve body, and the inner hole of the sealing nut passes through the valve stem.

[0004] Existing shut-off valves do not have a timed shut-off function for low flow rates. Users generally have the habit of not turning off the gas supply valve for a long time. The small flow leakage generated in the pipeline will lead to the long-term accumulation of gas, which will cause a fire after reaching the lower explosive limit. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a shut-off valve that automatically closes at a time when the flow rate is below a certain threshold, thereby resolving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a shut-off valve that shuts off at a time when the flow rate is less than a certain amount, comprising a valve body tube, a connecting pipe fixedly connected to the top of the valve body tube, a valve body threadedly connected to the top of the connecting pipe, a manual adjustment mechanism fixedly connected to the top of the valve body, and a small flow timed shut-off mechanism threadedly connected to the inside of the valve body. Low-volume, timed shutdown institutions include: A support block is threadedly connected to the inside of the valve body, and a flow regulating mechanism is fixedly connected to the bottom of the support block; A first connecting rod is slidably connected inside the connecting pipe, and a sealing block is fixedly connected to the bottom of the first connecting rod; The second cylindrical spring has one end fixedly connected to the sealing block, and the other end of the second cylindrical spring is fixedly connected to the first sliding disc block. The sealing block has a cylindrical through groove and an arc-shaped through groove inside.

[0007] Preferably, a pressure sensor is fixedly connected to the surface of the sealing block, a sensing head is fixedly connected to the surface of the pressure sensor, and the first sliding disk is slidably connected inside the sealing block.

[0008] Preferably, the diameter of the through hole in the cylindrical through groove is smaller than the diameter of the through hole in the arc-shaped through groove, and a sealing ring is fixedly connected inside the valve body tube.

[0009] Preferably, a second connecting rod is rotatably connected to the top of the first connecting rod, and a slider is rotatably connected to the surface of the second connecting rod. The slider is slidably connected to the support block and the valve body.

[0010] Preferably, a drive motor is fixedly connected inside the support block, and a cylindrical gear is fixedly connected inside the drive motor through an output shaft. The cylindrical gear has a groove inside. A toothed block is fixedly connected to the surface of the slider, and the toothed block meshes with the cylindrical gear. An electronically controlled timer is fixedly connected to the top of the valve body.

[0011] Preferably, the flow regulating mechanism includes a mounting base, which is fixedly connected to the bottom of the support block. A third cylindrical spring is fixedly connected inside the mounting base, and a locking block is fixedly connected to the surface of the third cylindrical spring, with the locking block slidably connected to the mounting base.

[0012] Preferably, a fixing block is snapped into the inside of the support block, a limit rod is fixedly connected to the bottom of the fixing block, a fourth cylindrical spring is fixedly connected to the bottom of the fixing block, and a second sliding disc is fixedly connected to the bottom of the fourth cylindrical spring.

[0013] Preferably, there are two mounting bases, the limiting rod has a through groove inside, and the limiting rod is slidably connected to the second sliding plate.

[0014] Preferably, the manual adjustment mechanism includes a support frame, which is fixedly connected to the top of the valve body. A sliding block is slidably connected inside the support frame, and a protrusion is provided at the bottom of the sliding block.

[0015] Preferably, a rotating handle is fixedly connected to the top of the sliding block, and a double fixed disc is slidably connected to the surface of the sliding block, with a first cylindrical spring fixedly connected to the surface of the double fixed disc.

[0016] This invention provides a shut-off valve that closes at a set time when the flow rate is below a certain threshold. It offers the following advantages: 1. This type of shut-off valve that closes at a set time when the flow rate is below a certain threshold, by setting a first sliding block, when the gas flow into the left side of the valve body pipe is less than the set value, the pressure on the left side of the valve body pipe is relatively low, and the pressure difference between the left and right sides of the valve body pipe is extremely small or decreases sharply. The first sliding block moves away from the sensor head, and then, in conjunction with the sensor head sensing the pressure sensor, triggers the electronic timer to start counting down. After the set time is reached, the drive motor is started to drive the cylindrical gear to rotate further clockwise, thereby moving the sealing block to the bottom and completely cutting off the gas path. This effectively solves the problem of long-term accumulation of small-flow gas leakage, which can lead to fire and explosion when the concentration reaches the lower explosive limit. It actively completes gas leakage protection in unattended scenarios.

[0017] 2. This shut-off valve, which automatically closes at a certain flow rate, features a sliding block and a manually adjustable handle. By pressing and rotating the handle, the cylindrical gear engages with the sliding block, allowing direct manual control of the gear's rotation. This further adjusts the position of the sealing block, enabling manual control to directly prevent gas leaks and quickly cut off the leaking gas source. Combined with a low-flow-rate timed shut-off mechanism, it provides dual protection against automatic leaks and manual emergencies, preventing uncontrolled gas leaks caused by single electrical control failures and further mitigating safety hazards.

[0018] 3. This type of shut-off valve that closes at a certain time when the flow rate is below a certain threshold uses a locking block to press the fixing block into the support block. At this time, the locking block moves into the mounting base under the action of the third cylindrical spring, which facilitates the quick installation of the fixing block. The fourth cylindrical spring with different elastic coefficients can be replaced to adapt to the normal flow range of different gas usage scenarios. It not only ensures stable valve conduction and prevents accidental shut-off during normal gas usage, but also accurately identifies small flow abnormalities and triggers valve closure, avoiding the risk of gas leakage caused by leak detection. This allows the leak prevention function to accurately match the usage needs of different households and different gas appliances. Attached Figure Description

[0019] Figure 1 This is a front-view stereoscopic structural diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention viewed from below; Figure 3 This is a schematic diagram of the support block structure of the present invention; Figure 4 This is a schematic diagram of the slider structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the second connecting rod structure of the present invention; Figure 7 This is a schematic diagram of the cylindrical gear structure of the present invention; Figure 8 This is a schematic diagram of the tooth block structure of the present invention; Figure 9 For the present invention Figure 6 Enlarged view of point B in the middle; Figure 10 For the present invention Figure 8 Enlarged diagram of point C in the middle.

[0020] In the diagram: 1. Valve body pipe; 2. Connecting pipe; 3. Valve body; 4. Manual adjustment mechanism; 41. Rotating handle; 42. Double fixed disc; 43. First cylindrical spring; 44. Support frame; 45. Sliding block; 5. Small flow timed shut-off mechanism; 51. Sealing block; 52. Sealing ring; 53. Arc-shaped through groove; 54. Cylindrical through groove; 55. First sliding disc; 56. Second cylindrical spring; 57. Sensor head; 58. Pressure sensor; 59. First connecting rod; 510. Electrically controlled timer; 511. Second connecting rod; 512. Slider; 513. Gear block; 514. Drive motor; 515. Cylindrical gear; 516. Support block; 6. Flow adjustment mechanism; 61. Mounting base; 62. Locking block; 63. Third cylindrical spring; 64. Fixed block; 65. Limiting rod; 66. Second sliding disc; 67. Fourth cylindrical spring. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0023] Example 1: Please refer to Figure 1-8 The present invention provides a technical solution: a shut-off valve that shuts off at a time when the flow rate is less than a certain amount, comprising a valve body tube 1, a connecting pipe 2 fixedly connected to the top of the valve body tube 1, a valve body 3 threadedly connected to the top of the connecting pipe 2, a manual adjustment mechanism 4 fixedly connected to the top of the valve body 3, and a small flow timed shut-off mechanism 5 threadedly connected inside the valve body 3. The low-flow timed shutdown mechanism 5 includes: Support block 516 is threaded inside valve body 3, and flow regulating mechanism 6 is fixedly connected to the bottom of support block 516; The first connecting rod 59 is slidably connected inside the connecting pipe 2, and a sealing block 51 is fixedly connected to the bottom of the first connecting rod 59; The second cylindrical spring 56 has one end fixedly connected to the sealing block 51, and the other end of the second cylindrical spring 56 is fixedly connected to the first sliding disk block 55. The sealing block 51 has a cylindrical through groove 54 and an arc-shaped through groove 53 inside.

[0024] A pressure sensor 58 is fixedly connected to the surface of the sealing block 51, and a sensor head 57 is fixedly connected to the surface of the pressure sensor 58. The first sliding disk 55 is slidably connected inside the sealing block 51.

[0025] The diameter of the through hole of the cylindrical through groove 54 is smaller than the diameter of the through hole of the arc-shaped through groove 53. A sealing ring 52 is fixedly connected inside the valve body tube 1. The sealing ring 52 is fixedly installed inside the valve body tube 1 and fits tightly with the end face of the sealing block 51 when the valve is closed, forming a reliable main sealing surface.

[0026] The top of the first connecting rod 59 is rotatably connected to the second connecting rod 511, and the surface of the second connecting rod 511 is rotatably connected to the slider 512. The slider 512 is slidably connected to the support block 516 and the valve body 3.

[0027] A drive motor 514 is fixedly connected inside the support block 516. A cylindrical gear 515 is fixedly connected inside the drive motor 514 via an output shaft. A groove is opened inside the cylindrical gear 515. A toothed block 513 is fixedly connected to the surface of the slider 512, and the toothed block 513 meshes with the cylindrical gear 515. An electronically controlled timer 510 is fixedly connected to the top of the valve body 3.

[0028] In use, when the gas within the rated range is introduced into the inlet side of the valve body pipe 1 (the inlet side is the left side of the valve body pipe), the pressure on the left side of the valve body pipe 1 is much greater than the pressure on the right side. At this time, the sealing block 51 is significantly separated from the interior of the valve body pipe 1. During this separation, the sealing block 51 moves upwards, causing the first connecting rod 59 to move as well. The movement of the first connecting rod 59, through the connection of the second connecting rod 511, causes the slider 512 to move towards both ends of the valve body 3. A large flow of gas passes through the interior of the valve body pipe 1, achieving normal gas supply. At this time, the axial thrust of the gas on the sealing block 51 is greater than that of the fourth cylindrical spring 67. Due to the elasticity of the spring, the sealing block 51 is separated from the interior of the valve body tube 1 to a large extent, resulting in a large pressure difference between the left and right sides of the valve body tube 1, and the first sliding plate 55 is always in contact with the sensing head 57. The fourth cylindrical spring 67 with different elastic coefficients can be replaced by quickly replacing the fixing block 64, thus adapting to the rated flow range of different households and gas appliances. When the gas flow rate is small, the separation between the sealing block 51 and the interior of the valve body tube 1 is small, meaning the sealing block 51 moves back under the action of the fourth cylindrical spring 67. At this time, the separation between the sealing block 51 and the interior of the valve body tube 1 is small, and some gas directly enters the interior of the sealing block 51 through the cylindrical through groove 54 and the arc-shaped through groove 53. At this time, the first sliding plate 55... The reverse movement of the disc 55 towards the location of the sensor head 57 results in a very small or drastic decrease in the pressure difference between the left and right sides of the valve body pipe 1. The sensor head 57 senses this and triggers the electronic timer 510 to start a countdown of a preset duration. When the countdown ends, it controls the start of the drive motor 514. The drive motor 514 drives the cylindrical gear 515 to rotate clockwise through the output shaft. The clockwise rotation of the cylindrical gear 515 drives the toothed block 513 to move towards each other. Finally, the flow regulating mechanism 6 controls the sealing block 51 to move towards the bottom until the sealing block 51 and the sealing ring 52 are tightly fitted together, completely cutting off the gas path. This achieves automatic valve closure after a small flow leakage delay, preventing the gas from accumulating to an explosive concentration over a long period of time.

[0029] By setting the first sliding block 55, when the gas flow into the left side of the valve body pipe 1 is less than the set value, the pressure on the left side of the valve body pipe is small, and the pressure difference between the left and right sides of the valve body pipe 1 is extremely small or decreases sharply. The first sliding block 55 moves away from the sensor head 57. Then, in conjunction with the sensor head 57 sensing the pressure sensor 58, the electronic control timer 510 is triggered to start the countdown. After the set time is reached, the drive motor 514 is controlled to start and drive the cylindrical gear 515 to rotate further clockwise, thereby moving the sealing block 51 to the bottom and completely cutting off the gas path. This effectively solves the problem of long-term accumulation of small-flow gas leakage, which can lead to fire and explosion when the concentration reaches the lower limit of explosion. It actively completes gas leakage protection in unattended scenarios.

[0030] By setting a sliding insert 45 and manually adjusting the rotating handle 41, the cylindrical gear 515 can be controlled to engage with the sliding insert 45 by pressing and rotating the rotating handle 41. This allows for direct manual control of the rotation of the cylindrical gear 515, further adjusting the position of the sealing block 51. This enables manual control to directly prevent gas leakage and quickly cut off the leaking gas source. Combined with the small-flow timed shut-off mechanism 5, it achieves dual protection of automatic leak prevention and manual emergency response, avoiding gas leakage and loss of control caused by a single electrical control failure, thereby further preventing the occurrence of safety accidents.

[0031] Example 2: Please refer to Figure 1-10 Based on Embodiment 1, the present invention provides a technical solution: The flow regulating mechanism 6 includes a mounting base 61, which is fixedly connected to the bottom of the support block 516. A third cylindrical spring 63 is fixedly connected inside the mounting base 61, and a locking block 62 is fixedly connected to the surface of the third cylindrical spring 63. The locking block 62 is slidably connected to the mounting base 61.

[0032] A fixing block 64 is snapped into the inside of the support block 516. A limit rod 65 is fixedly connected to the bottom of the fixing block 64. A fourth cylindrical spring 67 is fixedly connected to the bottom of the fixing block 64. A second sliding disc block 66 is fixedly connected to the bottom of the fourth cylindrical spring 67.

[0033] There are two mounting bases 61. The limiting rod 65 has a through groove inside and is slidably connected to the second sliding plate 66.

[0034] The manual adjustment mechanism 4 includes a support frame 44, which is fixedly connected to the top of the valve body 3. A sliding block 45 is slidably connected inside the support frame 44, and a protrusion is provided at the bottom of the sliding block 45.

[0035] A rotating handle 41 is fixedly connected to the top of the sliding insert 45, and a double fixed disc 42 is slidably connected to the surface of the sliding insert 45. A first cylindrical spring 43 is fixedly connected to the surface of the double fixed disc 42.

[0036] In use, firstly, select the appropriate elastic coefficient of the fourth cylindrical spring 67 according to different household users. Then, install the fixing block 64 into the support block 516. During the installation process, the locking block 62 slides into the mounting base 61 under the action of the third cylindrical spring 63, eventually locking the fixing block 64. Under normal circumstances, the flow of gas is controlled by the movement of the first connecting rod 59, which drives the slider 512 to move towards both ends of the valve body 3 through the connection of the second connecting rod 511. At this time, the limiting rod 65 slides into the first connecting rod 59, and at the same time, the limiting rod 65 slides relative to the second sliding plate 66. At this time, the fourth cylindrical spring 67 is compressed, thereby stabilizing the flow of gas. In emergency situations such as electrical control failure or sudden leakage, the rotating handle 41 can be pressed and rotated simultaneously to lock the cylindrical gear 515 with the sliding insert 45. At this time, the rotating handle 41 can be rotated clockwise to drive the cylindrical gear 515 clockwise. Rotating the needle completely cuts off the valve body pipe 1. Quickly rotating the handle 41 counterclockwise locks the sliding insert 45 into the groove inside the cylindrical gear 515. At this time, under the action of the first cylindrical spring 43, the handle 41 moves upward a certain distance, and the sliding insert 45 is fully engaged inside the cylindrical gear 515, which facilitates the control of different gas flow rates. The flow adjustment mechanism 6 is used to match the rated flow threshold of different gas usage scenarios: the fixed block 64 is fixed inside the support block 516 by the two side locking blocks 62. The third cylindrical spring 63 provides radial locking force for the locking blocks 62 to ensure stable installation. When the trigger flow needs to be adjusted, the fixed block 64 can be directly pulled out for replacement. By replacing the fourth cylindrical spring 67 with a different elastic coefficient, the balance pressure of the sealing block 51 is adjusted to adapt to the rated flow range of different households and different gas-using equipment. This ensures that the valve is stably connected and does not close accidentally during normal gas use, and can accurately identify small flow leakage and trigger valve closure.

[0037] By setting the locking block 62, the fixing block 64 is pressed into the support block 516. At this time, the locking block 62 moves into the mounting base 61 under the action of the third cylindrical spring 63, which facilitates the quick installation of the fixing block 64. The fourth cylindrical spring 67 with different elastic coefficients can be replaced to adapt to the normal flow range of different gas usage scenarios. This ensures that the valve body pipe 1 is stably connected and does not shut off accidentally during normal gas usage, and can accurately identify small flow of abnormal leakage and trigger valve closure, avoiding the risk of gas leakage caused by leakage detection. This allows the leak prevention function to accurately match the usage needs of different households and different gas appliances.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A shut-off valve that closes at a set time when the flow rate is less than a certain amount, comprising a valve body tube (1), characterized in that: The valve body tube (1) is fixedly connected to a connecting pipe (2), the top of the connecting pipe (2) is threadedly connected to a valve body (3), the top of the valve body (3) is fixedly connected to a manual adjustment mechanism (4), and the inside of the valve body (3) is threadedly connected to a small flow timed shut-off mechanism (5). The low-flow timed shutdown mechanism (5) includes: Support block (516), which is threadedly connected to the inside of valve body (3), and a flow regulating mechanism (6) is fixedly connected to the bottom of support block (516). The first connecting rod (59) is slidably connected inside the connecting pipe (2), and a sealing block (51) is fixedly connected to the bottom of the first connecting rod (59). The second cylindrical spring (56) has one end fixedly connected to the sealing block (51), and the other end of the second cylindrical spring (56) is fixedly connected to the first sliding disk block (55). The sealing block (51) has a cylindrical through groove (54) and an arc-shaped through groove (53) inside.

2. The shut-off valve that closes at a set time when the flow rate is less than a certain amount, as described in claim 1, is characterized in that: A pressure sensor (58) is fixedly connected to the surface of the sealing block (51), and a sensor head (57) is fixedly connected to the surface of the pressure sensor (58). The first sliding disk (55) is slidably connected inside the sealing block (51).

3. The shut-off valve that closes at a set time when the flow rate is less than a certain amount, as described in claim 2, is characterized in that: The diameter of the through hole of the cylindrical through groove (54) is smaller than the diameter of the through hole of the arc through groove (53), and a sealing ring (52) is fixedly connected inside the valve body tube (1).

4. A shut-off valve that closes at a set time when the flow rate is less than a certain amount, as described in claim 3, characterized in that: The top of the first connecting rod (59) is rotatably connected to a second connecting rod (511), and the surface of the second connecting rod (511) is rotatably connected to a slider (512). The slider (512) is slidably connected to the support block (516) and the valve body (3).

5. A shut-off valve that closes at a set time when the flow rate is less than a certain amount, as described in claim 4, characterized in that: The support block (516) is fixedly connected to a drive motor (514), and the drive motor (514) is fixedly connected to a cylindrical gear (515) through an output shaft. The cylindrical gear (515) has a groove inside. The surface of the slider (512) is fixedly connected to a toothed block (513), and the toothed block (513) meshes with the cylindrical gear (515). The top of the valve body (3) is fixedly connected to an electronically controlled timer (510).

6. A shut-off valve that closes at a set time when the flow rate is less than a certain amount, as described in claim 1, characterized in that: The flow regulating mechanism (6) includes a mounting base (61), which is fixedly connected to the bottom of the support block (516). A third cylindrical spring (63) is fixedly connected inside the mounting base (61), and a locking block (62) is fixedly connected to the surface of the third cylindrical spring (63), and the locking block (62) is slidably connected to the mounting base (61).

7. A shut-off valve that closes at a set time when the flow rate is less than a certain amount, as described in claim 6, characterized in that: The support block (516) is internally fitted with a fixing block (64), the bottom of the fixing block (64) is fixedly connected with a limit rod (65), the bottom of the fixing block (64) is fixedly connected with a fourth cylindrical spring (67), and the bottom of the fourth cylindrical spring (67) is fixedly connected with a second sliding disc block (66).

8. A shut-off valve that closes at a set time when the flow rate is less than a certain amount, as described in claim 7, characterized in that: There are two mounting bases (61), the limiting rod (65) has a through groove inside, and the limiting rod (65) is slidably connected to the second sliding plate (66).

9. A shut-off valve that closes at a set time when the flow rate is less than a certain amount, as described in claim 1, characterized in that: The manual adjustment mechanism (4) includes a support frame (44), which is fixedly connected to the top of the valve body (3). A sliding block (45) is slidably connected inside the support frame (44), and a protrusion is provided at the bottom of the sliding block (45).

10. A shut-off valve that closes at a set time when the flow rate is less than a certain amount, as described in claim 9, characterized in that: The top of the sliding plug (45) is fixedly connected to a rotating handle (41), and the surface of the sliding plug (45) is slidably connected to a double fixed disc block (42), and the surface of the double fixed disc block (42) is fixedly connected to a first cylindrical spring (43).

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