Jacking liquid outlet structure for liquid packaging bag

Abstract

The invention discloses a jacking liquid outlet structure for a liquid packaging bag, and relates to the technical field of covering caps. A communication hole communicated with the infusion hole is formed in the middle of the joint annular plate; a valve element cavity communicated with the communicating hole is formed in the external connector, and the external connector is provided with a valve element stop block which is located in the valve element cavity and surrounds a cavity opening; the tripod is clamped in the middle of the joint annular plate and inserted into the valve element cavity, and a valve element channel communicated with the valve element cavity is formed in the tripod; the core rod is connected to the valve element channel in a sliding mode, the core rod extends into the valve element cavity, and a conveying groove extending in the axial direction is formed in the side wall of the peripheral side of the core rod; an abutting face matched with the valve element stop block is formed on the side, away from the core rod, of the core head; the pushing spring is arranged on the peripheral side of the core rod in a sleeving mode, and the pushing spring pushes the core head to slide in the valve element cavity till the abutting face abuts against the valve element stopping block. The possibility that liquid flows out when the container topples over can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of mouth covers, and in particular to a top-pressing liquid-discharging structure for a liquid packaging bag. Background Art

[0002] In daily life and industrial production, containers are key tools for storing and dispensing liquids. Their design is always committed to protecting liquids from external contamination while ensuring convenient liquid outflow.

[0003] Traditional container designs are equipped with various lids to ensure the sealing of the liquid. When the liquid in the container needs to flow out, the lid must usually be removed to open the container before the liquid in the container can flow out.

[0004] However, in actual operation, if the container is tipped over at this time, a large amount of liquid in the container will flow out, causing waste. Summary of the invention

[0005] In order to reduce the possibility of liquid flowing out when the container is tipped over, the present application provides a top pressure liquid discharge structure for a liquid packaging bag.

[0006] The present application provides a top pressure liquid discharge structure for a liquid packaging bag, which adopts the following technical solution: A top liquid pressing structure for a liquid packaging bag, comprising: An internal joint formed with an infusion hole; A connector annular plate, arranged at one end of the internal connector, wherein a connecting hole connected to the infusion hole is formed in the middle of the connector annular plate; An external joint, arranged on a side of the joint annular plate away from the internal joint, the external joint forming a valve core cavity connected to the connecting hole, and the external joint being provided with a valve core block located in the valve core cavity and surrounding the cavity opening; A tripod, which is clamped and arranged in the middle of the joint annular plate and inserted into the valve core cavity, and the tripod forms a valve core channel communicating with the valve core cavity; A core rod is slidably connected to the valve core channel, the core rod extends into the valve core cavity, and a transmission groove extending in the axial direction is formed on the peripheral side wall of the core rod; A core head is arranged at the end of the core rod and is slidably connected in the valve core channel, and a side of the core head away from the core rod is formed with an abutment surface adapted to the valve core block; A push spring is sleeved on the outer peripheral side of the core rod, and the push spring pushes the core head to slide in the valve core cavity until the abutment surface abuts against the valve core blocking block.

[0007] By adopting the above technical solution, the mouth cover can effectively reduce the possibility of a large amount of liquid flowing out when the container is tipped over. Specifically, when the container is in a normal upright state without being touched, the core head abuts against the valve core block under the action of the push spring, so that the flow of liquid between the transmission groove and the valve core cavity is blocked, thereby achieving the closure of the external joint. When the container is tipped over, the liquid is restricted by the cooperation between the core head and the valve core block, reducing the possibility of liquid flowing out.

[0008] Optionally, a core rod protrusion is provided on the outer peripheral side of the core rod and away from the core head, and there are a plurality of core rod protrusions which are respectively located between adjacent transmission grooves; When the abutting surface abuts against the valve core blocking block, the core rod protrusion abuts against the side of the tripod facing away from the core head.

[0009] By adopting the above technical solution, the core rod protrusion arranged on the outer peripheral side of the core rod can make the core rod protrusion abut against the side of the tripod facing away from the core head when the abutting surface abuts against the valve core block, thereby reducing the possibility of the core rod escaping from the valve core channel.

[0010] Optionally, a spring protrusion is provided on the outer peripheral side of the core rod and close to the core head, and there are multiple spring protrusions which are respectively located between adjacent transmission grooves, and the pushing spring is clamped on the spring protrusion.

[0011] By adopting the above technical solution, a spring protrusion is added and used in conjunction with a push spring, which can ensure that the push spring is stably fixed in a specified position, reduce displacement or falling off during long-term use, and further improve the working stability of the push spring.

[0012] Optionally, a cap is clamped on a side of the external joint away from the joint annular plate.

[0013] By adopting the above technical solution, the cap is clamped on the external joint, reducing the possibility of contamination of the external joint.

[0014] Optionally, a sealing ring is provided on the outer peripheral side of the external joint, and the sealing ring abuts against the inner peripheral side wall of the cap.

[0015] By adopting the above technical solution, a sealing ring is added to the outer peripheral side of the external joint, and the sealing ring is made to abut against the inner peripheral side wall of the cap, thereby enhancing the sealing performance at the container opening, further reducing the possibility of contamination of the external joint, and reducing the possibility of residual liquid on the external joint flowing to the outer wall of the external joint.

[0016] Optionally, the core rod is provided with a stopper located in the transmission groove, and when the abutting surface abuts against the valve core stopper, the stopper and the core rod block the valve core channel; A receiving groove is formed in the tripod, a liquid inlet communicating with the receiving groove is formed at the bottom of the tripod, and a liquid outlet communicating with the receiving groove is formed at the top of the tripod; The tripod is provided with a driving column which slides up and down, and the driving column extends into the valve core cavity, and the driving column is located between the liquid inlet and the liquid outlet and is matched with a blocking block; The driving column is provided with an elastic driving member, and the elastic driving member drives the blocking block to move toward the driving column close to the infusion hole; The core rod is provided with a pushing block, and when the core head slides into the valve core cavity, the pushing block pushes the driving column to slide toward the infusion hole, and at this time, the blocking block blocks the liquid outlet; The tripod is provided with an elastic power piece, and when the pushing block moves away from the driving column, the elastic power piece drives the driving column to move toward the core head until the blocking block blocks the liquid inlet; The tripod is formed with a mounting groove in communication with the receiving groove, and the tripod is provided with an expansion airbag located in the mounting groove; The tripod is provided with an extrusion assembly, and when the blocking block blocks the liquid outlet, the extrusion assembly squeezes the expansion airbag, and at this time, the expansion airbag squeezes into and fills the containing groove; When the pushing block moves away from the driving column, the expansion airbag shrinks back into the mounting groove.

[0017] By adopting the above technical solution, during the movement of the core head toward the valve core block, the driving spring pushes the blocking block to continue to block the liquid outlet, while the expanded airbag contracts back into the installation groove. At this time, negative pressure is generated in the receiving groove to suck the residual liquid in the valve core cavity from the liquid inlet into the receiving groove; then, when the core head abuts against the valve core block, the blocking block blocks the liquid inlet, and at this time the residual liquid in the valve core cavity is discharged, so that the push spring is separated from the residual liquid, reducing the possibility that the push spring is immersed in liquid and affects the push spring stiffness, strength, fatigue resistance, etc.

[0018] Optionally, the extrusion assembly includes an extrusion block, an extrusion plate and an extrusion column; The extrusion plate slides up and down in the tripod and is connected to the expansion airbag; The extrusion column slides up and down on the tripod, one end of the extrusion column extends toward the core head to the outside of the tripod, and the other end is connected to the extrusion plate; The extrusion block is arranged on the outer peripheral side of the core rod and connected to the extrusion column. When the core head slides into the valve core cavity, the extrusion block pushes the extrusion column to slide into the tripod. At this time, the extrusion plate squeezes the expansion airbag.

[0019] By adopting the above technical solution, the extrusion assembly composed of the extrusion block, the extrusion plate and the extrusion column can push the extrusion column to slide into the tripod through the extrusion block when the core head slides into the valve core cavity, so that the extrusion plate squeezes the expansion airbag, so that the expansion airbag is squeezed into and fills the receiving groove, reducing the possibility of liquid in the valve core cavity entering the receiving groove when the external joint discharges liquid. When the core head slides out of the valve core cavity, the expansion airbag shrinks back into the installation groove, allowing the residual liquid in the valve core cavity to flow into the receiving groove.

[0020] Optionally, the elastic driving member is a driving spring, the driving column is formed with a slide groove, the blocking block is provided with a slider that slides up and down in the driving groove, and the driving spring is installed in the slide groove; One end of the driving spring abuts against a side of the sliding block close to the core head, and the other end abuts against a wall of the sliding groove.

[0021] By adopting the above technical solution, the driving spring is installed in the slide groove, one end of the driving spring abuts against the side of the slider close to the core head, and the other end abuts against the wall of the slide groove, thereby providing a stable elastic force when the blocking block slides up and down, so that the blocking block can reliably block the liquid outlet.

[0022] Optionally, the elastic power member is a power spring, the tripod is formed with a driving groove for the driving column to slide up and down, the side wall of the driving column is provided with a limiting block, and the driving groove wall is formed with a limiting groove for the limiting block to slide up and down; The power spring is installed in the limiting groove, one end of the power spring abuts against the side of the limiting block away from the core head, and the other end abuts against the wall of the limiting groove.

[0023] By adopting the above technical solution, the power spring is installed in the limiting groove, and when the power spring is elastically released, it can push the driving column to move toward the core head.

[0024] In summary, the present application includes at least one of the following beneficial effects: 1. When the container is in a normal upright state without being touched, the core head abuts against the valve core block under the action of the push spring, so that the liquid channel between the transmission groove and the valve core cavity is blocked, thereby achieving the closure of the external joint. When the container is tipped over, the liquid is restricted by the cooperation between the core head and the valve core block, reducing the possibility of liquid outflow; 2. During the movement of the core head toward the valve core block, the driving spring pushes the blocking block to continue to block the liquid outlet, while the expanded airbag shrinks back into the installation groove. At this time, negative pressure is generated in the receiving groove to suck the residual liquid in the valve core cavity from the liquid inlet into the receiving groove; then, when the core head abuts against the valve core block, the blocking block blocks the liquid inlet, and the residual liquid in the valve core cavity is discharged at this time, so that the push spring is separated from the residual liquid, reducing the possibility of the push spring being immersed in liquid and affecting the push spring stiffness, strength, and fatigue resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the external structure of the first embodiment of the present application; Figure 2 is a schematic diagram of the internal cross-section of Embodiment 1 of the present application; Figure 3 It is a schematic diagram of the connection structure between the core rod and the tripod in the first embodiment of the present application; Figure 4 is a schematic diagram of the internal cross-section of the second embodiment of the present application; Figure 5 It is a schematic diagram of the state when the stopper slides into the valve core channel in the second embodiment of the present application; Figure 6 is a schematic diagram of the internal structure of the tripod in the second embodiment of the present application; Figure 7 yes Figure 4 A magnified schematic diagram of part A.

[0026] Figure numerals: 1, internal joint; 11, infusion hole; 2, joint ring plate; 21, communication hole; 22, tripod block; 3, external joint; 31, valve core cavity; 32, valve core block; 33, sealing ring; 4, tripod; 41, triangular head; 42, tripod cylinder; 43, valve core channel; 44, receiving groove; 441, mounting groove; 442, liquid inlet; 443, liquid outlet; 45, driving column; 451, slide groove; 452, driving Spring; 453, driving groove; 4531, limiting groove; 4532, power spring; 454, limiting block; 46, blocking block; 461, slider; 47, inflation airbag; 5, core rod; 51, transmission groove; 52, core head; 521, abutment surface; 53, core rod protrusion; 54, spring protrusion; 55, stopper; 56, push block; 6, push spring; 7, cap; 8, extrusion assembly; 81, extrusion block; 82, extrusion plate; 83, extrusion column. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-7 This application is described in further detail.

[0028] The embodiment of the present application discloses a top pressure liquid discharge structure for a liquid packaging bag.

[0029] The inventors of the present application have discovered that in daily life and industrial production, containers are key tools for storing and distributing liquids, and their design is always committed to protecting the liquid from external contamination while achieving convenient outflow of the liquid. Traditional container designs are equipped with various lids to ensure the sealing of the liquid. When the liquid in the container needs to flow out, the lid must usually be removed to open the container before the liquid in the container can flow out. However, in actual operation, if the container is tipped over at this time, a large amount of liquid in the container is likely to flow out, causing waste. To this end, the present application mainly adopts a top pressure liquid discharge structure for a liquid packaging bag, which reduces the possibility of liquid outflow when the container is tipped over. The present application is further described in detail below. Example

[0030] See also Figure 1 and Figure 2 The top pressure liquid discharge structure for liquid packaging bag provided in the embodiment of the present application comprises an internal joint 1, a joint ring plate 2, an external joint 3, a tripod 4, a core rod 5, a core head 52, and a push spring 6, wherein the internal joint 1 is a cylindrical structure, and the internal joint 1 is formed with an infusion hole 11 extending along the central axis. When in use, the internal joint 1 is installed and fixed at one end of the liquid outlet of the container, and the liquid in the container is discharged through the infusion hole 11.

[0031] See also Figure 2 and Figure 3 The joint ring plate 2 is fixed to the end of the internal joint 1 away from the container, and a connecting hole 21 is formed in the middle of the joint ring plate 2. The connecting hole 21 is connected to the infusion hole 11, and the outer diameter of the joint ring plate 2 is larger than the outer diameter of the internal joint 1. The external joint 3 is fixedly connected to the side of the joint ring plate 2 away from the internal joint 1, and the outer diameter of the external joint 3 is smaller than the outer diameter of the internal joint 1. A valve core cavity 31 extending along the central axis is formed in the middle of the external joint 3, and the valve core cavity 31 is connected to the connecting hole 21. The liquid in the container enters the connecting hole 21 from the infusion hole 11, and then enters the valve core cavity 31, and finally flows out of the external joint 3 from the valve core cavity 31.

[0032] The tripod 4 includes a triangular head 41 and a tripod cylinder 42. The tripod cylinder 42 is fixed at one end of the triangular head 41. The tripod cylinder 42 and the middle of the triangular head 41 are respectively formed with mutually connected valve core channels 43. During installation, the tripod cylinder 42 is inserted into the valve core cavity 31, and the outer peripheral side wall of the tripod cylinder 42 abuts against the inner peripheral side wall of the valve core cavity 31. The joint annular plate 2 is fixedly connected with a tripod block 22. The tripod block 22 is located in the connecting hole 21, and the tripod block 22 has a certain elastic deformation capacity. When the triangular head 41 is installed, it slides on the tripod block 22. At this time, the tripod block 22 is deformed until the triangular head 41 slides into the valve core cavity 31. The deformation of the tripod block 22 is restored to limit the reverse sliding of the triangular head 41.

[0033] The core rod 5 is slidably connected to the valve core passage 43, one side of the core rod 5 extends into the valve core cavity 31, and the other side extends out of the valve core passage 43 in a direction away from the valve core cavity 31. A transmission groove 51 extending in the axial direction is formed on the side wall of the core rod 5, and the liquid in the infusion hole 11 flows through the transmission groove 51 through the communication hole 21 and then enters the valve core cavity 31.

[0034] Furthermore, a core rod protrusion 53 is fixedly connected to the outer peripheral side of the core rod 5, and the core rod protrusion 53 is located at a position far away from the core head 52. There are multiple core rod protrusions 53, and each core rod protrusion 53 is located between two adjacent transmission grooves 51. The core rod protrusion 53 is a triangular block structure, and the core rod protrusion 53 is made of a material with elastic deformation ability, such as stainless steel, plastic, etc. When in use, the inclined surface of the core rod protrusion 53 guides the core rod 5 to slide into the valve core channel 43, and when the core rod protrusion 53 enters the valve core channel 43, the core rod protrusion 53 is squeezed until the core rod protrusion 53 slides out of the valve core channel 43 and the deformation is restored. At this time, the core rod protrusion 53 can limit the core rod 5 from retreating from the valve core channel 43.

[0035] The core head 52 is fixed to the end of the core rod 5, and the core head 52 is slidably connected to the valve core channel 43. During installation, the core rod 5 is first passed through the valve core channel 43, and then the core head 52 is slidably inserted into the valve core cavity 31, and then the tripod 4 is clamped to the joint ring plate 2.

[0036] A contact surface 521 is formed on the side of the core head 52 away from the core rod 5, and the contact surface 521 extends in the circumferential direction. The external joint 3 is fixedly connected with a valve core block 32 of an annular structure, and the valve core block 32 is located at the position of the cavity opening of the valve core cavity 31, and the valve core block 32 is located in the valve core cavity 31. The contact surface 521 is adapted to the valve core block 32. When the contact surface 521 abuts against the valve core block 32, the core head 52 cooperates with the valve core block 32 to achieve the sealing of the external joint 3, and limit the liquid in the valve core cavity 31 from flowing out of the valve core cavity 31.

[0037] The push spring 6 is sleeved on the outer peripheral side of the core rod 5, and a spring protrusion 54 is fixedly connected to the outer peripheral side of the core rod 5. The spring protrusion 54 is located near the core head 52, and there are multiple spring protrusions 54, each of which is located between two adjacent transmission grooves 51. The push spring 6 is clamped on the spring protrusion 54 to fix the push spring 6. One end of the push spring 6 abuts against the tripod 4, and the other end abuts against the side of the core head 52 facing the core rod 5. After the triangular head 41 is installed on the joint annular plate 2, the push spring 6 is elastically released, pushing the core head 52 away from the tripod 4 until the abutting surface 521 abuts against the valve core block 32, thereby improving the sealing performance of the external joint 3 and reducing the possibility of liquid outflow when the container is tipped. At this time, the core rod protrusion 53 abuts against the side of the triangular head 41 facing away from the tripod cylinder 42.

[0038] The spring protrusion 54 can be made of metal or other materials with high strength to ensure that it is not easily deformed or damaged during use. The shape and size of the spring protrusion 54 can be adjusted according to the needs of the container to adapt to containers of different sizes. The push spring 6 is clamped on the spring protrusion 54 and can be fixed on the core rod 5 by clamping or other means to improve its connection stability and torsion resistance.

[0039] In addition, a cap 7 is clamped on the side of the external joint 3 away from the joint annular plate 2, and a sealing ring 33 is embedded and fixed on the outer peripheral side of the external joint 3. The sealing ring 33 is located at a position of the external joint 3 away from the internal joint 1, and the sealing ring 33 abuts against the inner peripheral side wall of the cap 7. After the container is discharged, the cap 7 is clamped and installed on the external joint 3, and the possibility of contamination of the external joint 3 is reduced through the cooperation of the sealing ring 33.

[0040] The implementation principle of the top pressure liquid discharge structure for a liquid packaging bag in the first embodiment of the present application is as follows: When the container is discharging liquid, the cap 7 is first removed, and then the core head 52 is pressed toward the valve core cavity 31, so that a gap is formed between the core head 52 and the valve core block 32, and the liquid in the valve core cavity 31 can flow out from between the core head 52 and the valve core block 32. When the core head 52 is not pressed, the push spring 6 is elastically released, pushing the core head 52 to move away from the tripod 4, so that the abutting surface 521 abuts against the valve core block 32, and the external joint 3 is sealed. When the container is tilted, the container is not supported, that is, the core head 52 is not pressed, and the external joint 3 is in a sealed state, limiting the outflow of liquid in the container. Example

[0041] See also Figure 4 and Figure 5The difference between the second embodiment of the present application and the first embodiment is that the triangular head 41 is a round block structure. When the triangular head 41 is located in the valve core cavity 31, the outer peripheral side wall of the triangular head 41 abuts against the cavity wall of the valve core cavity 31. The core rod 5 is fixedly connected with a stopper 55. The stopper 55 is located in the transmission groove 51 and away from the core head 52. The stopper 55 corresponds to the transmission groove 51 one by one. When the abutting surface 521 abuts against the valve core block 32, the stopper 55 and the outer wall of the core rod 5 abut against the peripheral side wall of the valve core channel 43 respectively, and the valve core channel 43 is blocked.

[0042] See also Figure 4 and Figure 6 A receiving groove 44 is formed in the tripod 4, and a liquid inlet 442 is formed on the top of the tripod 4. The liquid inlet 442 is connected to the receiving groove 44, and the liquid in the valve core cavity 31 flows into the receiving groove 44 through the liquid inlet 442. A liquid outlet 443 is formed at the bottom of the tripod 4, and the liquid outlet 443 is connected to the receiving groove 44. The liquid in the receiving groove 44 flows out through the liquid outlet 443 and enters the infusion hole 11. In addition, the liquid inlet 442 is located directly above the liquid outlet 443 and has the same shape.

[0043] See also Figure 6 and Figure 7 The tripod 4 is formed with a driving groove 453 extending along the axial direction of the tripod cylinder 42, and the driving groove 453 is respectively connected with the liquid inlet 442, the containing groove 44 and the liquid outlet 443. The tripod 4 is provided with a driving column 45, which slides up and down in the driving groove 453, and one end of the driving column 45 extends to the liquid outlet 443, and the other end protrudes out of the tripod 4 toward the core head 52.

[0044] A "T"-shaped slide groove 451 is formed on the side wall of the driving column 45, and the slide groove 451 extends along the length direction of the driving column 45. The driving column 45 is provided with a blocking block 46, the shape of which is adapted to the liquid inlet 442 and the liquid outlet 443, and a slider 461 is fixedly connected to the side wall of the blocking block 46, and the slider 461 is slidably connected to the slide groove 451 up and down. The driving column 45 is provided with an elastic driving member, so that the blocking block 46 moves toward the side of the driving column 45 away from the core head 52.

[0045] The elastic driving member is specifically a driving spring 452, which is installed in the slide slot 451. One end of the driving spring 452 abuts against the side of the slider 461 close to the core head 52, and the other end abuts against the wall of the slide slot 451. When the driving spring 452 is elastically released, the slider 461 is pushed to move away from the core head 52 until the slider 461 abuts against the wall of the slide slot 451 away from the core head 52. At this time, the blocking block 46 is adjacent to the end of the driving column 45 away from the core head 52.

[0046] The side wall of the driving column 45 is fixedly connected with a limiting block 454, and a limiting groove 4531 is formed on the groove wall of the driving groove 453 away from the groove, and the limiting block 454 slides up and down in the limiting groove 4531. The tripod 4 is provided with an elastic power member, which is specifically a power spring 4532. The power spring 4532 is installed in the limiting groove 4531, and one end of the power spring 4532 abuts against the side of the limiting block 454 away from the core head 52, and the other end abuts against the wall of the limiting groove 4531. In the initial state, the power spring 4532 is elastically released, pushing the driving column 45 to move toward the core head 52 until the limiting block 454 abuts against the groove wall of the limiting groove 4531 on the side close to the core head 52, so that the blocking block 46 is stuck in the liquid inlet 442 to block the liquid inlet 442, and the liquid outlet 443 is in an open state.

[0047] The side wall of the core rod 5 is fixedly connected with a push block 56, which is located just above the driving column 45. When the blocking block 46 blocks the liquid inlet 442, the driving column 45 abuts against the side of the push block 56 facing away from the core head 52. When the core head 52 slides into the valve core cavity 31, the push block 56 pushes the driving column 45 to slide away from the core head 52, first making the blocking block 46 block the liquid outlet 443, and then the driving column 45 slides downward to the outside of the tripod 4, the slider 461 slides in the slide groove 451, and the driving spring 452 and the power spring 4532 enter the compressed state respectively.

[0048] In addition, a mounting groove 441 is formed in the tripod 4, and the mounting groove 441 is located on the side of the receiving groove 44 away from the driving column 45. A connecting port is formed in the tripod 4, and one side of the connecting port is located on the side wall of the mounting groove 441 and at the bottom, and the other side of the connecting port is connected to the receiving groove 44. The tripod 4 is provided with an expansion airbag 47, and the expansion airbag 47 is made of materials with elastic deformation ability such as rubber and silicone. The expansion airbag 47 is installed in the mounting groove 441, and the bottom outer wall of the expansion airbag 47 and the position away from the receiving groove 44 are fixedly connected to the groove wall of the mounting groove 441 on the side away from the core head 52. The tripod 4 is provided with an extrusion component 8. When the blocking block 46 blocks the liquid outlet 443, the extrusion component 8 squeezes the expansion airbag 47, so that the expansion airbag 47 squeezes into and fills the receiving groove 44, and squeezes the liquid in the receiving groove 44 from the receiving groove 44 into the valve core cavity 31 through the liquid inlet 442. When the pushing block 56 moves away from the driving column 45, the blocking block 55 slides into the valve core channel 43, and then the expansion airbag 47 shrinks back into the mounting groove 441, and the residual liquid in the valve core cavity 31 can flow into the receiving groove 44 through the liquid inlet 442, until the core head 52 abuts against the valve core blocking block 32, and the blocking block 46 blocks the liquid inlet 442, which helps to reduce the possibility of the pushing spring 6 being immersed in the liquid.

[0049] The extrusion assembly 8 includes an extrusion block 81, an extrusion plate 82 and an extrusion column 83. The extrusion plate 82 is connected to the tripod 4 by sliding up and down, and the extrusion plate 82 is fixed to the outer wall of the top of the inflation airbag 47. The extrusion column 83 is connected to the tripod 4 by sliding up and down, and one end of the extrusion column 83 extends to the outside of the tripod 4 toward the core head 52, and the other end is fixedly connected to the top of the extrusion plate 82. The extrusion block 81 is fixedly connected to the outer peripheral side of the core rod 5, and the extrusion block 81 is located directly above the extrusion column 83 and is fixedly connected. When the core head 52 slides into the valve core cavity 31 (the valve core cavity 31 is in Figure 4 When the extrusion block 81 pushes the extrusion column 83 to slide into the tripod 4, the extrusion plate 82 squeezes the expansion airbag 47, so that the expansion airbag 47 is squeezed into the receiving groove 44 through the connecting port, and the liquid in the receiving groove 44 is discharged through the liquid inlet 442. When the extrusion block 81 moves away from the extrusion column 83, the expansion airbag 47 elastically recovers, and then the extrusion block 81 drives the extrusion plate 82 to move toward the core head 52 through the extrusion column 83, and the expansion airbag 47 shrinks back into the installation groove 441 with the deformation recovery ability of the expansion airbag 47, and the residual liquid in the valve core cavity 31 can flow into the receiving groove 44.

[0050] The implementation principle of the top pressure liquid discharge structure for a liquid packaging bag in the embodiment of the present application is as follows: When the core head 52 is pressed into the valve core cavity 31 until the stopper 55 slides out of the valve core channel 43 and enters the liquid discharge state, the driving column 45 drives the blocking block 46 to block the liquid outlet 443 , and at the same time the extrusion plate 82 squeezes the expansion airbag 47 into the accommodating groove 44 . When the core head 52 loses the pressure and moves toward the valve core block 32, the block 55 first slides into the valve core channel 43 to restrict the liquid from entering the valve core cavity 31; then, as the core head 52 continues to move toward the valve core block 32, the driving spring 452 pushes the blocking block 46 to continue to block the liquid outlet 443, while the expansion airbag 47 shrinks back into the installation groove 441. At this time, a negative pressure is generated in the receiving groove 44 to suck the residual liquid in the valve core cavity 31 from the liquid inlet 442 into the receiving groove 44; then, when the core head 52 abuts against the valve core block 32, the blocking block 46 blocks the liquid inlet 442. At this time, the residual liquid in the valve core cavity 31 is discharged, so that the push spring 6 is separated from the residual liquid, reducing the possibility of the push spring 6 being immersed in the liquid and affecting the stiffness, strength, and fatigue resistance of the push spring 6.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A top liquid extrusion structure for a liquid packaging bag, characterized in that: include An internal joint (1) formed with an infusion hole (11); A connector annular plate (2) is arranged at one end of the internal connector (1), and a connecting hole (21) connected to the infusion hole (11) is formed in the middle of the connector annular plate (2); An external joint (3) is arranged on a side of the joint annular plate (2) away from the internal joint (1), the external joint (3) is formed with a valve core cavity (31) connected to the communication hole (21), and the external joint (3) is provided with a valve core block (32) located in the valve core cavity (31) and surrounding the cavity opening; A tripod (4) is clamped and arranged in the middle of the joint annular plate (2) and inserted into the valve core cavity (31), and the tripod (4) is formed with a valve core channel (43) communicating with the valve core cavity (31); A core rod (5) is slidably connected to the valve core passage (43), the core rod (5) extending into the valve core cavity (31), and a transmission groove (51) extending in the axial direction is formed on a peripheral side wall of the core rod (5); A core head (52) is arranged at the end of the core rod (5) and is slidably connected to the valve core channel (43); a side of the core head (52) away from the core rod (5) is formed with an abutment surface (521) adapted to the valve core block (32); A push spring (6) is sleeved on the outer peripheral side of the core rod (5), and the push spring (6) pushes the core head (52) to slide in the valve core cavity (31) until the abutment surface (521) abuts against the valve core block (32).

2. The top liquid extrusion structure for a liquid packaging bag according to claim 1, characterized in that: A core rod protrusion (53) is provided on the outer peripheral side of the core rod (5) and at a position away from the core head (52), and there are a plurality of core rod protrusions (53) which are respectively located between adjacent transmission grooves (51); When the abutting surface (521) abuts against the valve core blocking block (32), the core rod protrusion (53) abuts against the side of the tripod (4) facing away from the core head (52).

3. The top liquid extrusion structure for a liquid packaging bag according to claim 1, characterized in that: A spring protrusion (54) is provided on the outer peripheral side of the core rod (5) and close to the core head (52). There are a plurality of spring protrusions (54) which are respectively located between adjacent transmission grooves (51). The push spring (6) is clamped to the spring protrusion (54).

4. The top liquid extrusion structure for a liquid packaging bag according to claim 1, characterized in that: A cap (7) is clamped and provided on a side of the external joint (3) away from the joint annular plate (2).

5. The top liquid extrusion structure for a liquid packaging bag according to claim 4, characterized in that: A sealing ring (33) is provided on the outer peripheral side of the external joint (3), and the sealing ring (33) abuts against the inner peripheral side wall of the cap (7).

6. The top liquid extrusion structure for a liquid packaging bag according to claim 1, characterized in that: The core rod (5) is provided with a stopper (55) located in the transmission groove (51); when the abutting surface (521) abuts against the valve core stopper (32), the stopper (55) and the core rod (5) block the valve core passage (43); A receiving groove (44) is formed in the tripod (4), a liquid inlet (442) communicating with the receiving groove (44) is formed at the bottom of the tripod (4), and a liquid outlet (443) communicating with the receiving groove (44) is formed at the top of the tripod (4); The tripod (4) is provided with a driving column (45) which is slidable up and down, and the driving column (45) extends into the valve core cavity (31). The driving column (45) is located up and down between the liquid inlet (442) and the liquid outlet (443) and is matched with a blocking block (46); The driving column (45) is provided with an elastic driving member, and the elastic driving member drives the blocking block (46) to move toward the driving column (45) close to the infusion hole (11); The core rod (5) is provided with a pushing block (56), and when the core head (52) slides into the valve core cavity (31), the pushing block (56) pushes the driving column (45) to slide in the direction of the infusion hole (11), and at this time, the blocking block (46) blocks the liquid outlet (443); The tripod (4) is provided with an elastic power member, and when the pushing block (56) moves away from the driving column (45), the elastic power member drives the driving column (45) to move towards the core head (52) until the blocking block (46) blocks the liquid inlet (442); The tripod (4) is formed with a mounting groove (441) which is in communication with the accommodating groove (44), and the tripod (4) is provided with an expansion airbag (47) located in the mounting groove (441); The tripod (4) is provided with an extrusion assembly (8), and when the blocking block (46) blocks the liquid outlet (443), the extrusion assembly (8) squeezes the expansion airbag (47), and at this time, the expansion airbag (47) squeezes into and fills the containing groove (44); When the pushing block (56) moves away from the driving column (45), the expansion airbag (47) contracts back into the installation groove (441).

7. The top liquid extrusion structure for a liquid packaging bag according to claim 6, characterized in that: The extrusion assembly (8) comprises an extrusion block (81), an extrusion plate (82) and an extrusion column (83); The squeezing plate (82) slides up and down inside the tripod (4) and is connected to the expansion airbag (47); The extrusion column (83) slides up and down on the tripod (4); one end of the extrusion column (83) extends toward the core head (52) to the outside of the tripod (4), and the other end is connected to the extrusion plate (82); The extrusion block (81) is arranged on the outer peripheral side of the core rod (5) and is connected to the extrusion column (83). When the core head (52) slides into the valve core cavity (31), the extrusion block (81) pushes the extrusion column (83) to slide into the tripod (4). At this time, the extrusion plate (82) squeezes the expansion airbag (47).

8. The top liquid extrusion structure for a liquid packaging bag according to claim 6, characterized in that: The elastic driving member is a driving spring (452), the driving column (45) is formed with a slide groove (451), the blocking block (46) is provided with a sliding block (461) that slides up and down in the slide groove (451), and the driving spring (452) is installed in the slide groove (451); One end of the driving spring (452) abuts against a side of the sliding block (461) close to the core head (52), and the other end abuts against a groove wall of the sliding groove (451).

9. The top liquid extrusion structure for a liquid packaging bag according to claim 6, characterized in that: The elastic power member is a power spring (4532); the tripod (4) is formed with a driving groove (453) for the driving column (45) to slide up and down; a limiting block (454) is provided on a side wall of the driving column (45); and a limiting groove (4531) is formed on a groove wall of the driving groove (453) for the limiting block (454) to slide up and down; The power spring (4532) is installed in the limiting groove (4531), one end of the power spring (4532) abuts against a side of the limiting block (454) away from the core head (52), and the other end abuts against a groove wall of the limiting groove (4531).

Images