Mechanical overloading prevention self-locking protection device

Abstract

The present application relates to fluid storage and transportation safety equipment technical field, disclose a kind of mechanical type anti-overloading self-locking protection device, including tank, tank top is equipped with tank cover, detection tube and inlet pipe are provided on tank cover, detection tube is connected with three-way joint, three-way joint is connected with breather valve and venturi respectively, nozzle, sliding rod and ball core are installed in venturi, sliding rod is connected with telescopic rod, telescopic rod outside is equipped with rotating rod, rotating rod is equipped with sealing ball, pneumatic transmission pipe and liquid level sensing capillary are also installed in venturi, lock rod, diaphragm and compression spring are arranged in pneumatic transmission pipe.The present application is through venturi negative pressure cooperation pneumatic transmission pipe and lock structure, rely on the gas pressure change of medium flow linkage component movement, without power and electrical signal, avoid the disadvantages of electric control structure being easily disturbed, power failure, can be automatically cut off after liquid level overrun Feed and lock, improve equipment running stability and security.

Description

Technical Field

[0001] This invention belongs to the technical field of fluid storage and transportation safety equipment, specifically, it relates to a mechanical anti-overloading self-locking protection device. Background Technology

[0002] In industrial production scenarios such as storage tanks, chemical feeding, and fluid transportation, storage tanks are core equipment for media storage and transfer. During continuous feeding operations, corresponding overfill protection structures are required to control the tank's feed limit level, preventing overflow or overfilling and ensuring orderly, stable, and continuous feeding operations. Currently, industrial tanks are generally equipped with corresponding liquid level detection and feeding protection structures, mainly used to monitor the liquid level in the tank in real time and promptly cut off feeding when the liquid level approaches the limit. These are important supporting devices for ensuring safe operation of storage tanks, avoiding material waste, and improving equipment operational stability, and are widely used in various liquid media storage and transportation conditions.

[0003] However, current tank overloading protection uses electrical control detection and protection, which relies on electricity and electrical signals to operate. Under complex chemical working conditions, it is susceptible to interference and failure, and its safety and stability are insufficient. In addition, the electrical control structure is complicated, the installation and maintenance costs are high, and it has defects such as failure when power is off, easy to be triggered falsely, and lack of self-locking position keeping ability. It is easy to cause tank overflow, material loss and safety hazards, and it is difficult to meet the use requirements of long-term passive stable protection.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A mechanical anti-overloading self-locking protection device includes a tank body, a support leg connected to the bottom of the tank body, a liquid outlet pipe connected to the bottom of the side wall of the tank body, a valve installed on the liquid outlet pipe, a tank cover fitted to the top of the tank body, a detection pipe and a liquid inlet pipe provided on the tank cover, a waveguide tube fixed inside the tank cover, a three-way connector connected to the upper end of the detection pipe, the three-way connector being connected to a breather valve and a venturi tube respectively, a nozzle installed inside the venturi tube, a bracket connected to the nozzle, a sliding rod fitted in the bracket, a ball core connected to the end of the sliding rod, a return spring fitted on the sliding rod, a telescopic rod also connected to the sliding rod, a rotating rod sleeved on the outside of the telescopic rod, a sealing ball fitted on the rotating rod, a pneumatic transmission tube and a liquid level sensing capillary tube installed in the venturi tube, the liquid level sensing capillary tube passing through the inside of the waveguide tube, and a locking rod, a diaphragm and a compression spring installed inside the pneumatic transmission tube.

[0006] In a preferred embodiment of the present invention, the three-way connector is provided with a lower interface, an upper interface and a side interface. The lower interface is connected to the detection tube, the upper interface is connected to the venturi tube, and the side interface is connected to the breather valve.

[0007] In a preferred embodiment of the present invention, the lower interface and the upper interface are arranged coaxially in the vertical direction.

[0008] In a preferred embodiment of the present invention, the venturi tube includes an inlet pipe, an outlet pipe, and a side suction pipe, wherein a negative pressure chamber is formed between the inlet pipe and the nozzle.

[0009] In a preferred embodiment of the present invention, the venturi tube is provided with an installation groove, and a sealing ball and a rotating rod are rotatably installed in the installation groove. The rotating rod passes through the installation groove and its end extends out of the venturi tube.

[0010] In a preferred embodiment of the present invention, a straight groove is provided on the side wall of the nozzle, and a telescopic rod is movably installed in the straight groove.

[0011] In a preferred embodiment of the present invention, a support ring is fixed to the outside of the sliding rod, and the return spring is sleeved on the outside of the sliding rod, with both ends of the return spring abutting against the bracket and the support ring, respectively.

[0012] In a preferred embodiment of the present invention, a pneumatic transmission tube is installed in the side suction tube, a diaphragm is slidably installed in the pneumatic transmission tube, the diaphragm and the pneumatic transmission tube form a cavity, and a compression spring is installed between the pneumatic transmission tube and the diaphragm, with the two ends of the compression spring abutting against the diaphragm and the pneumatic transmission tube respectively.

[0013] In a preferred embodiment of the present invention, a locking groove is provided on the sliding rod body, and a locking rod is slidably installed in the pneumatic transmission pipe, with the end of the locking rod being adapted to the locking groove.

[0014] In a preferred embodiment of the present invention, a through hole is provided at the end of the side suction pipe, and a liquid level sensing capillary is connected to the end of the side suction pipe. The through hole is connected to the liquid level sensing capillary, and the liquid level sensing capillary passes through the tee joint and the detection tube in sequence and extends into the tank.

[0015] Compared with the prior art, the present invention has the following advantages: This invention utilizes a venturi tube negative pressure system in conjunction with a pneumatic transmission pipe and a locking structure. It relies on the pressure changes generated by the flow of the medium to drive the movement of components. It operates without the need for electrical power or signals, avoiding the drawbacks of electronic control structures being susceptible to interference from the working environment, failure due to power outages, and detection malfunctions. This improves the stability and safety of the equipment. Through the cooperation of the rotating rod and the telescopic rod, it achieves self-locking and unlocking switching, and can automatically cut off the feed and maintain the locked state when the liquid level in the tank exceeds the limit.

[0016] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] In the attached diagram: Figure 1 A schematic diagram of a mechanical anti-overloading self-locking protection device; Figure 2 This is a schematic diagram of the installation of a mechanical anti-overloading self-locking protection device; Figure 3 A mechanical anti-overloading self-locking protection device Figure 2 Enlarged view of point A in the middle; Figure 4 A three-dimensional diagram of a mechanical anti-overloading self-locking protection device; Figure 5 This is a schematic diagram of the internal structure of a mechanical anti-overloading self-locking protection device; Figure 6 This is a cross-sectional view of a mechanical anti-overloading self-locking protection device.

[0018] In the diagram: 1. Tank body; 2. Support leg; 3. Discharge pipe; 4. Valve; 5. Tank cover; 6. Detection pipe; 7. Inlet pipe; 8. Waveguide pipe; 9. T-connector; 91. Lower interface; 92. Upper interface; 93. Side interface; 10. Breathing valve; 11. Venturi tube; 111. Water inlet pipe; 112. Water outlet pipe; 113. Negative pressure chamber; 114. Side suction pipe; 12. Nozzle; 13. Support; 14. Sliding rod; 15. Ball core; 16. Support ring; 17. Return spring; 18. Telescopic rod; 19. Rotating rod; 20. Sealing ball; 21. Mounting groove; 22. Straight groove; 23. Pneumatic transmission pipe; 24. Locking rod; 25. Diaphragm; 26. Compression spring; 27. Through hole; 28. Liquid level sensing capillary tube; 29. ​​Cavity; 30. Locking groove. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0020] like Figures 1 to 6As shown, a mechanical anti-overloading self-locking protection device includes a tank body 1, a support leg 2 connected to the bottom of the tank body 1, a liquid outlet pipe 3 connected to the bottom of the side wall of the tank body 1, a valve 4 installed on the liquid outlet pipe 3, a tank cover 5 mounted on the top of the tank body 1, a detection pipe 6 and a liquid inlet pipe 7 installed on the tank cover 5, a waveguide 8 fixed inside the tank cover 5, a three-way connector 9 connected to the upper end of the detection pipe 6, the three-way connector 9 being connected to a breather valve 10 and a venturi tube 11 respectively, a nozzle 12 installed inside the venturi tube 11, and a bracket connected to the nozzle 12. 13. A sliding rod 14 is installed in the bracket 13. A ball core 15 is connected to the end of the sliding rod 14. A return spring 17 is installed on the sliding rod 14. The sliding rod 14 is also connected to a telescopic rod 18. A rotating rod 19 is sleeved on the outside of the telescopic rod 18. A sealing ball 20 is installed on the rotating rod 19. A pneumatic transmission tube 23 and a liquid level sensing capillary tube 28 are installed in the venturi tube 11. The liquid level sensing capillary tube 28 passes through the inside of the waveguide tube 8. A locking rod 24, a diaphragm 25 and a compression spring 26 are installed in the pneumatic transmission tube 23. In this setup, the support leg 2 supports the tank 1, the valve 4 controls the opening and closing of the outlet pipe 3, the waveguide 8 protects the level sensing capillary 28, the tee connector 9 enables the connection of branch pipes, the venturi tube 11, together with the internal components, forms a medium flow and air pressure sensing circuit, the rotating rod 19 and the telescopic rod 18 can drive the sliding rod 14 to move in linkage, the locking rod 24 and the diaphragm 25 cooperate with the air pressure change to complete the locking and unlocking action of the sliding rod 14, and the ball core 15 follows the movement of the sliding rod 14 to realize the opening and closing control of the internal flow channel of the venturi tube 11.

[0021] like Figures 1 to 6 As shown, in a specific embodiment, the tee connector 9 has a lower interface 91, an upper interface 92, and a side interface 93. The lower interface 91 connects to the detection tube 6, the upper interface 92 connects to the venturi tube 11, and the side interface 93 connects to the breather valve 10. In this configuration, the tee connector 9 connects the detection tube 6, the venturi tube 11, and the breather valve 10 through the three interfaces respectively. While constructing the gas path and the medium pipeline, the breather valve 10 works in conjunction with the overall pipeline to balance the internal air pressure of the tank 1 in real time, ensuring stable operation of the equipment.

[0022] like Figures 1 to 6 As shown, the lower interface 91 and the upper interface 92 are further arranged coaxially in the vertical direction. In this configuration, the coaxial arrangement of the lower interface 91 and the upper interface 92 allows the detection tube 6 and the venturi tube 11 to achieve linear communication.

[0023] like Figures 1 to 6 As shown, the Venturi tube 11 further includes an inlet pipe 111, an outlet pipe 112, and a side suction pipe 114, with a negative pressure chamber 113 formed between the inlet pipe 111 and the nozzle 12. In this configuration, the medium flows in through the inlet pipe 111 and flows out through the outlet pipe 112. During the flow, a negative pressure is formed in the negative pressure chamber 113, and the negative pressure is conducted outward through the side suction pipe 114.

[0024] like Figures 1 to 6 As shown, the Venturi tube 11 is further provided with a mounting groove 21. A sealing ball 20 and a rotating rod 19 are rotatably mounted in the mounting groove 21. The rotating rod 19 passes through the mounting groove 21 and its end extends out of the Venturi tube 11. In this configuration, the sealing ball 20 and the mounting groove 21 cooperate to seal the rotational position of the rotating rod 19. Using this as a fulcrum, the rotating rod 19 extending out of the tube can rotate under the action of external force, thereby driving the subsequent transmission components to move.

[0025] like Figures 1 to 6 As shown, the nozzle 12 has a straight groove 22 on its side wall, and a telescopic rod 18 is movably installed in the straight groove 22. In this configuration, when the telescopic rod 18 follows the rotating rod 19 to rotate and extend, it can move freely along the straight groove 22 to avoid jamming during the movement and ensure that the entire transmission structure operates flexibly.

[0026] like Figures 1 to 6 As shown, a support ring 16 is fixed to the outside of the sliding rod 14, and a return spring 17 is sleeved on the outside of the sliding rod 14. The two ends of the return spring 17 abut against the bracket 13 and the support ring 16, respectively. In this configuration, when the sliding rod 14 moves under the traction of an external force, it will cause the support ring 16 to simultaneously squeeze the return spring 17. After the external force and locking constraint are released, the return spring 17 pushes the sliding rod 14 to return to its original position by its own elasticity, thereby causing the ball core 15 to block the flow channel.

[0027] like Figures 1 to 6 As shown, a pneumatic transmission tube 23 is further installed in the side suction tube 114, and a diaphragm 25 is slidably installed in the pneumatic transmission tube 23. The diaphragm 25 and the inner wall of the pneumatic transmission tube 23 form a cavity 29. A compression spring 26 is installed between the pneumatic transmission tube 23 and the diaphragm 25, with its two ends abutting against the diaphragm 25 and the pneumatic transmission tube 23, respectively. In this configuration, the side suction tube 114 transmits negative pressure to the interior of the pneumatic transmission tube 23. When the air pressure inside the cavity 29 changes, it pushes the diaphragm 25 to move. During the movement of the diaphragm 25, it squeezes or releases the compression spring 26, thereby realizing the reset and buffering of the pneumatic drive action.

[0028] like Figures 1 to 6 As shown, a locking groove 30 is further provided on the sliding rod 14, and a locking rod 24 is slidably installed in the pneumatic transmission pipe 23, with the end of the locking rod 24 fitting into the locking groove 30. In this configuration, the locking rod 24 moves synchronously with the diaphragm 25, and its end can be engaged or disengaged from the locking groove 30, thereby limiting and fixing the sliding rod 14 or releasing it, realizing the self-locking and unlocking switching of the mechanism.

[0029] like Figures 1 to 6As shown, the side suction pipe 114 is further provided with a through hole 27 at its end, and a liquid level sensing capillary 28 is connected to the end of the side suction pipe 114. The through hole 27 is connected to the liquid level sensing capillary 28, which passes through the tee connector 9 and the detection pipe 6 in sequence and extends into the tank 1. In this configuration, the gas inside the tank 1 can enter the side suction pipe 114 through the liquid level sensing capillary 28 and the through hole 27, thus achieving gas path connection. When the liquid level in the tank 1 rises and submerges the opening of the liquid level sensing capillary 28, the gas path is blocked, thereby triggering the entire self-locking protection action.

[0030] The implementation principle of the mechanical anti-overloading self-locking protection device in this embodiment is as follows: When the feeding operation needs to be started, the operator connects the external feeding pipe to the water inlet pipe 111 of the Venturi tube 11 through a flange, and then manually rotates the rotating rod 19. The rotating rod 19 rotates in the mounting groove 21 of the Venturi tube 11 by relying on the sealing ball 20 in the middle. During the rotation, the sealing ball 20 serves as the fulcrum of rotation, driving the telescopic rod 18 sleeved inside it to rotate together. Since one end of the telescopic rod 18 is hinged to the sliding rod 14, the sliding rod 14 can only slide axially inside the bracket 13 and cannot rotate with the telescopic rod 18. Therefore, the telescopic rod 18 will slide axially along the inner wall of the rotating rod 19 to compensate for the movement stroke. The telescopic rod 18 moves along the straight groove 22 on the side wall of the nozzle 12. Under the pulling action of the telescopic rod 18, the sliding rod 14 moves axially along the support 13. The support ring 16 on the outer side of the sliding rod 14 simultaneously squeezes the return spring 17, causing the return spring 17 to undergo compression deformation. The ball core 15 at the end of the sliding rod 14 then disengages from the flow channel of the venturi tube 11, opening the medium passage. As the sliding rod 14 continues to move, the locking groove 30 on its body gradually moves to a position aligned with the locking rod 24. The compression spring 26 inside the pneumatic transmission tube 23 pushes the diaphragm 25 and the locking rod 24 to move. The end of the locking rod 24 is embedded in the locking groove 30, completing the locking and positioning of the sliding rod 14. The self-locking assembly is officially in the normally open state, and the medium flow channel inside the venturi tube 11 remains unobstructed.

[0031] After the self-locking opening is completed, the medium flows from the inlet pipe 111 into the venturi tube 11, flows through the nozzle 12 area along the pipeline, and then flows out from the outlet pipe 112. It then flows continuously into the tank body 1 through the liquid inlet pipe 7 on the tank cover 5. During the high-speed flow of the medium in the venturi tube 11, the negative pressure chamber 113 formed by the outer wall of the nozzle 12 and the inner wall of the venturi tube 11 continuously forms a negative pressure. The negative pressure is conducted to the inside of the pneumatic transmission pipe 23 through the side suction pipe 114. Under the action of negative pressure, the air in the gas phase space of the tank body 1 passes through the liquid level sensing capillary 28, the side suction pipe 114, and the through hole 27 in sequence into the pneumatic transmission pipe 23, continuously replenishing the gas in the gas path and keeping the gas pressure in the cavity 29 of the pneumatic transmission pipe 23 in a relatively stable state. At this time, the pressure difference on both sides of the diaphragm 25 is small, the diaphragm 25 will not shift, the compression spring 26 remains unchanged, the locking rod 24 is always stuck in the locking groove 30, the medium continues to be delivered into the tank 1, the breather valve 10 connected to the three-way connector 9 works synchronously to balance the internal air pressure of the tank 1 in real time and ensure that the feeding process is stable. When the internal air pressure of the tank 1 decreases or increases, the breather valve 10 will be automatically driven to open to replenish or exhaust air into the tank. The breather valve 10 adopts the industry-standard ZFQ-1 type breather valve, which is a standard component of atmospheric pressure storage tanks and will not be described in detail here.

[0032] As feeding continues, the liquid level inside tank 1 gradually rises. When the liquid level rises to submerge the lower end of the liquid level sensing capillary 28, the liquid seals the opening due to its own surface tension, preventing air from entering the liquid level sensing capillary 28 and sealing the entire air passage into a closed space. The negative pressure chamber 113 continues to generate negative pressure and continuously draws in the gas in the closed air passage, causing the air pressure inside the pneumatic transmission pipe 23 to continuously decrease, creating a large pressure difference on both sides of the diaphragm 25. Under the action of the pressure difference, the diaphragm 25 moves towards the negative pressure direction, compressing the compression spring 26, and simultaneously driving the locking rod 24 to move axially. The end of the locking rod 24 slowly disengages from the locking groove 30, releasing the locking restriction on the sliding rod 14. After the limit is removed, the previously compressed return spring 17 begins to rebound and extend, pushing the sliding rod 14 to slide in the opposite direction along the bracket 13. The ball core 15 at the end of the sliding rod 14 moves accordingly, re-blocking the medium flow channel inside the venturi tube 11, cutting off the feed passage, and realizing automatic protection against over-leveling of the tank 1. When the sliding rod 14 returns to its original position, it will again drive the hinged telescopic rod 18 to move, and the telescopic rod 18 continues to slide inside the rotating rod 19.

[0033] After the device triggers automatic material cutoff, the locking structure cannot reset itself due to pipeline negative pressure. To resume feeding, it is necessary to manually rotate the rotating rod 19 again, pull the sliding rod 14 again, and engage the locking rod 24 and locking groove 30 to restore the feeding state. When the medium stored in tank 1 needs to be discharged, the operator can directly operate the valve 4 on the discharge pipe 3 to control the opening and closing of the discharge pipe and complete the medium discharge operation.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mechanical anti-overloading self-locking protection device, comprising a tank body (1), characterized in that, The tank body (1) is connected to a support leg (2) at the bottom. The tank body (1) is connected to a liquid outlet pipe (3) at the bottom of its side wall. A valve (4) is installed on the liquid outlet pipe (3). The tank body (1) is fitted with a tank cover (5). A detection pipe (6) and a liquid inlet pipe (7) are provided on the tank cover (5). A waveguide pipe (8) is fixed inside the tank cover (5). A three-way connector (9) is connected to the upper end of the detection pipe (6). The three-way connector (9) is connected to a breather valve (10) and a venturi tube (11) respectively. A nozzle (12) is installed inside the venturi tube (11). A bracket (13) is connected to the nozzle (12). The venturi tube (11) is equipped with a sliding rod (14), the end of which is connected to a ball core (15). A return spring (17) is mounted on the sliding rod (14). The sliding rod (14) is also connected to a telescopic rod (18). A rotating rod (19) is sleeved on the outside of the telescopic rod (18). A sealing ball (20) is mounted on the rotating rod (19). A pneumatic transmission tube (23) and a liquid level sensing capillary (28) are installed in the venturi tube (11). The liquid level sensing capillary (28) passes through the inside of the waveguide tube (8). A locking rod (24), a diaphragm (25), and a compression spring (26) are installed in the pneumatic transmission tube (23).

2. The mechanical anti-overloading self-locking protection device according to claim 1, characterized in that, The three-way connector (9) is provided with a lower interface (91), an upper interface (92) and a side interface (93). The lower interface (91) is connected to the detection tube (6), the upper interface (92) is connected to the venturi tube (11), and the side interface (93) is connected to the breathing valve (10).

3. The mechanical anti-overloading self-locking protection device according to claim 2, characterized in that, The lower interface (91) and the upper interface (92) are arranged coaxially in the vertical direction.

4. The mechanical anti-overloading self-locking protection device according to claim 1, characterized in that, The Venturi tube (11) includes an inlet pipe (111), an outlet pipe (112), and a side suction pipe (114), and a negative pressure chamber (113) is formed between the inlet pipe (111) and the nozzle (12).

5. A mechanical anti-overloading self-locking protection device according to claim 1, characterized in that, The venturi tube (11) has an installation groove (21) in which a sealing ball (20) and a rotating rod (19) are rotatably installed. The rotating rod (19) passes through the installation groove (21) and its end extends out of the venturi tube (11).

6. The mechanical anti-overloading self-locking protection device according to claim 1, characterized in that, The nozzle (12) has a straight groove (22) on its side wall, and a telescopic rod (18) is movably installed in the straight groove (22).

7. A mechanical anti-overloading self-locking protection device according to claim 1, characterized in that, A support ring (16) is fixed to the outside of the sliding rod (14), and the return spring (17) is sleeved on the outside of the sliding rod (14). The two ends of the return spring (17) abut against the bracket (13) and the support ring (16) respectively.

8. A mechanical anti-overloading self-locking protection device according to claim 4, characterized in that, A pneumatic transmission tube (23) is installed in the side suction tube (114), and a diaphragm (25) is slidably installed in the pneumatic transmission tube (23). The diaphragm (25) and the inner wall of the pneumatic transmission tube (23) form a cavity (29). A compression spring (26) is installed between the pneumatic transmission tube (23) and the diaphragm (25). The two ends of the compression spring (26) abut against the diaphragm (25) and the pneumatic transmission tube (23) respectively.

9. A mechanical anti-overloading self-locking protection device according to claim 1, characterized in that, The sliding rod (14) has a locking groove (30) on its body, and a locking rod (24) is slidably installed in the pneumatic transmission pipe (23). The end of the locking rod (24) is adapted to the locking groove (30).

10. A mechanical anti-overloading self-locking protection device according to claim 4, characterized in that, The side suction pipe (114) has a through hole (27) at its end. The side suction pipe (114) is connected to a liquid level sensing capillary (28). The through hole (27) is connected to the liquid level sensing capillary (28). The liquid level sensing capillary (28) passes through the three-way connector (9) and the detection tube (6) in sequence and extends into the tank body (1).

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