Self-sealing filling structure and self-sealing filling liquid nitrogen tank

Abstract

The utility model provides a self-sealing filling structure and a self-sealing filling liquid nitrogen tank, the self-sealing filling structure comprises a working medium filling port, a sealing cover, a linkage piece, a filling part and an exhaust part; the working medium filling port is fixedly arranged on the sealing cover; the working medium filling pipe is inserted into the working medium filling port along a first direction and is communicated with the filling part; the injection part comprises an injection part outlet and a first on-off device, and when the first on-off device is switched on, the working medium filling port is communicated with the injection part outlet; the exhaust part comprises an exhaust part inlet, an exhaust hole and a second on-off device, and when the second on-off device is switched on, the exhaust part inlet is communicated with the exhaust hole; the linkage piece is arranged in the first direction of the working medium filling port, and the working medium filling pipe is inserted into the working medium filling port in the first direction to trigger the linkage piece. And the linkage piece is in transmission connection with the first on-off device and the second on-off device to control the first on-off device and the second on-off device to be synchronously switched on or switched off. The linkage piece is arranged to control synchronous connection and disconnection of the liquid nitrogen tank, the injection part and the exhaust part, so that the pressure is stable and the sealing performance is high in the liquid nitrogen injection process.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a self-sealing filling structure and a self-sealing filling liquid nitrogen tank. Background Art

[0002] Cryoablation is a minimally invasive tumor treatment method. This technology uses cryogenic fluid to freeze and destroy abnormal cells and diseased tissues, and is used to treat various cancers and arrhythmias. It has the characteristics of little stimulation and damage to the natural cavity walls of the human body and is not prone to complications. Therefore, this technology is increasingly used in clinical surgery.

[0003] During cryoablation procedures, the device maintains an extremely low temperature at the end of the catheter by injecting a cryogenic medium into the catheter. This creates a low temperature at the treatment site, freezing the targeted tissue. The device requires refilling the cryogenic medium after each procedure. Currently, refilling the cryogenic medium primarily involves inserting a refilling tube connected to a refilling pump into the device's medium storage tank. While this method is simple to operate, it causes a large amount of air to enter the liquid nitrogen tank. Water molecules in the air form ice at the low temperature. As the number of refills increases, the amount of ice in the tank increases, gradually accumulating on the tank wall, forming layers of varying thickness. This not only reduces the effective volume inside the tank, affecting the storage and use of the cryogenic medium, but can also affect the performance of the device's internal storage tank and its pressure resistance. Furthermore, the liquid nitrogen tank must be kept sealed during refilling, and the vaporization of large amounts of liquid nitrogen can cause the pressure inside the tank to rise sharply, impacting the safety of the device and the operator.

[0004] In order to solve the above problems, the utility model proposes a low-temperature medium filling structure with normal pressure self-sealing. Utility Model Content

[0005] The utility model provides a self-sealing filling structure, which controls the synchronous opening and closing of the liquid nitrogen tank, the injection part and the exhaust part by arranging a linkage part, so that the pressure is stable and the sealing is strong during the filling process of liquid nitrogen.

[0006] A self-sealing filling structure includes a working fluid filling port, a sealing cover, a linkage, an injection portion, and an exhaust portion; the working fluid filling port is fixedly arranged on the sealing cover, and a working fluid filling pipe is inserted into the working fluid filling port along a first direction to communicate with the injection portion; the injection portion includes an injection portion outlet and a first on-off device, and when the first on-off device is turned on, the working fluid filling port and the injection portion outlet are connected; the exhaust portion includes an exhaust portion inlet, an exhaust hole, and a second on-off device, and when the second on-off device is turned on, the exhaust portion inlet and the exhaust hole are connected;

[0007] The linkage member is arranged in the first direction of the working fluid filling port, and the working fluid filling pipe is inserted into the working fluid filling port along the first direction to trigger the linkage member; and the linkage member is transmission-connected with the first on-off device and the second on-off device to control the first on-off device and the second on-off device to be synchronously turned on or off.

[0008] Furthermore, the injection part further includes a first transmission member, which is in transmission connection with the linkage member to control the on / off of the first on / off device;

[0009] The exhaust portion further includes a second transmission member, which is in transmission connection with the linkage member to control the on / off of the second on / off device.

[0010] Furthermore, the linkage member includes a movable panel, which is hingedly arranged on the inner wall of the injection part and is arranged in the first direction of the working fluid filling port. The working fluid filling pipe is inserted into the working fluid filling port along the first direction. The movable panel is triggered to displace in the first direction to control the first on-off device and the second on-off device to be turned on synchronously.

[0011] Furthermore, the first transmission member includes a connecting rod and a top rod connected in sequence, the connecting rod is connected to the movable panel, and is triggered by the displacement of the movable panel in the first direction, and the connecting rod drives the top rod to move in the first direction to turn on the first on-off device.

[0012] Furthermore, the linkage member further includes a connection hole fixedly provided on the movable panel, and the connection hole can be displaced in the first direction along with the linkage member.

[0013] Furthermore, the second transmission member includes a transmission rope, one end of the transmission rope is passed through the connecting hole, and the other end of the transmission rope is connected to the second on-off device. When triggered by the displacement of the connecting hole in the first direction, the transmission rope pulls the second on-off device to turn on the second on-off device.

[0014] Further, the transmission rope is in transmission contact with at least one pulley.

[0015] Furthermore, the first on-off device and the second on-off device are one-way valves.

[0016] Furthermore, a movable pressing block is provided at the fixed end of the push rod, and an elastic member is provided on the first direction of the movable pressing block.

[0017] A self-sealing filling liquid nitrogen tank comprises the above-mentioned self-sealing filling mechanism and a liquid nitrogen tank, wherein the injection part outlet and the exhaust part inlet are connected to the liquid nitrogen tank.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. The utility model is provided with a sealing cover, and the working medium filling port is fixedly arranged on the sealing cover, which ensures the sealing and convenience when filling the liquid nitrogen tank.

[0020] 2. The utility model is provided with a linkage part, which is arranged in the first direction of the working fluid filling port. The working fluid filling pipe is inserted into the working fluid filling port to trigger the linkage part to connect the liquid nitrogen tank with the injection part outlet and the exhaust outlet, so that the filling part and the exhaust part are connected with the liquid nitrogen tank only when the working fluid flows in, thereby ensuring the sealing of the filling process.

[0021] 3. The utility model is provided with an exhaust part. When filling liquid nitrogen, the exhaust part connected to the liquid nitrogen tank discharges the vaporized liquid nitrogen out of the liquid nitrogen tank, thereby maintaining the stability of the air pressure in the liquid nitrogen tank and improving the filling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0023] Figure 1 Shown is a structural schematic diagram of a self-sealing filling structure according to an embodiment of the present invention.

[0024] Figure 2 Shown is a cross-sectional view of a self-sealing filling structure in a truncated state according to an embodiment of the present invention.

[0025] Figure 3 Shown Figure 2 A cross-sectional view of the self-sealing filling structure of the illustrated embodiment in the conductive state.

[0026] Figure 4 Shown Figure 2 A top view of the self-sealing filling structure of the illustrated embodiment.

[0027] Figure 5 Shown is a schematic structural diagram of a self-sealing liquid nitrogen filling tank according to an embodiment of the present invention.

[0028] Figure numerals: working fluid filling port 11, sealing cover 12, linkage 13, injection part 14, exhaust part 15, working fluid filling pipe 16, injection part outlet 161, first on-off device 162, exhaust part inlet 151, exhaust hole 152, second on-off device 153, first transmission member 17, second transmission member 18, movable panel 131, connecting rod 171, push rod 172, connecting hole 132, transmission rope 181, pulley 19, liquid nitrogen tank 20, self-sealing filling mechanism 21, movable pressure block 22, elastic member 23. DETAILED DESCRIPTION

[0029] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0030] In the present invention, the first direction refers to the moving direction of the working fluid filling pipe when the working fluid filling pipe is inserted into the working fluid filling port.

[0031] like Figure 1-4 As shown, the self-sealing filling structure of this embodiment includes a working fluid filling port 11, a sealing cover 12, a linkage 13, an injection portion 14 and an exhaust portion 15; the provision of the sealing cover 12 ensures the sealing of the structure, the working fluid filling port 11 is fixedly provided on the sealing cover 12, and the working fluid filling pipe 16 is inserted into the working fluid filling port 11 along a first direction to communicate with the injection portion 14; the injection portion 14 includes an injection portion outlet 161 and a first on-off device 162. When the first on-off device 162 is turned on, the working fluid filling port 11 is communicated with the injection portion outlet 161; the injection portion 14 is used to inject the working fluid, and the working fluid flows from the working fluid filling pipe 16 into the injection portion 14 and is injected into the liquid nitrogen tank through the injection portion outlet 161 to replenish the liquid nitrogen. The exhaust part 15 includes an exhaust part inlet 151, an exhaust hole 152, and a second on-off device 153. When the second on-off device 153 is turned on, the exhaust part 15 inlet and the exhaust hole 152 are connected; the exhaust part 15 inlet is used to be connected to the liquid nitrogen tank. During the injection of liquid nitrogen, the vaporization of liquid nitrogen will cause the gas pressure in the liquid nitrogen to rise rapidly, affecting the safety of the equipment. When the liquid nitrogen tank is connected to the exhaust part 15, if the gas pressure in the liquid nitrogen tank is greater than the set pressure, the gas is discharged from the exhaust part 15 to stabilize the pressure in the equipment.

[0032] The linkage member 13 is disposed in a first direction of the working fluid filling port 11. The working fluid filling pipe 16 is inserted into the working fluid filling port 11 in the first direction, triggering the linkage member 13. The linkage member 13 is also in transmission connection with the first on-off device 162 and the second on-off device 153, controlling the synchronous on / off of the first on-off device 162 and the second on-off device 153. In this embodiment, the linkage member 13 includes a movable panel 131, which is hingedly disposed on the inner wall of the injection portion 14. The shape of the movable panel 131 is configured to fit the inner wall of the injection portion 14 as closely as possible to improve sealing. The movable panel 131 is disposed in the first direction of the working fluid filling port 11. After the working fluid filling pipe 16 is inserted into the working fluid filling port 11 in the first direction, it pushes the movable panel 131 to rotate about the hinge position, causing the movable panel 131 to displace in the first direction. The displacement of the movable panel 131 in the first direction can control the on / off of the first on-off device 162 and the second on-off device 153. The displacement creates a gap between the movable panel 131 , which is originally arranged to fit the inner wall of the injection portion 14 , and the inner wall of the injection portion 14 , so that the working fluid flows into the injection portion 14 along the working fluid filling pipe 16 and is injected into the liquid nitrogen tank through the injection portion outlet 161 .

[0033] The injection part 14 also includes a first transmission member 17, which is transmission-connected to the linkage member 13. In this embodiment, the first transmission member 17 is transmission-connected to the movable panel 131 to control the on and off of the first on-off device 162; the first transmission member 17 includes a connecting rod 171 and a top rod 172 connected in sequence, and the connecting rod 171 is connected to the movable panel 131. When triggered by the displacement of the movable panel 131 in the first direction, the connecting rod 171 drives the top rod 172 to move in the first direction, so that the top rod 172 contacts the first on-off device 162 to turn on the first on-off device 162.

[0034] In some embodiments, the linkage member 13 further includes a connection hole 132 fixedly disposed on the movable panel 131, wherein the connection hole 132 can move in a first direction along with the linkage member 13. The exhaust unit 15 further includes a second transmission member 18, which is in transmission connection with the linkage member 13 to control the on / off switching of the second on / off device 153. In some embodiments, a transmission rope 181 is in transmission contact with at least one pulley 19. The configuration of the pulley 19 can change the direction of the transmission rope 181, facilitating the arrangement of the transmission rope 181 according to the internal structure of the exhaust unit 15.

[0035] In some embodiments, the push rod 172 includes a movable pressure block, and an elastic member is provided in a first direction of the movable pressure block. Since one end of the push rod 172 is also connected to the connecting rod 171, during the filling process, due to the movement of the working fluid filling pipe 16 along the first direction, the linkage member 13 drives the connecting rod 171 and the push rod 172 to move in the first direction, and the movable pressure block located on the push rod 172 compresses the elastic member in the first direction. After the filling is completed, the working fluid filling pipe 16 is withdrawn, and the force in the first direction applied to the elastic member is reduced, and the elastic member returns to a natural state in the direction opposite to the first direction. The recovery process of the elastic member causes the movable pressure block on the push rod 172 and the connecting rod 171 to move in the direction opposite to the first direction to reset, ultimately driving the movable panel 131 to reset. The connecting hole 132 on the movable panel 131 also resets in the direction opposite to the first direction along with the movable panel 131, and the second on-off device 153 is reset via the transmission rope 181 connected to the connecting hole 132.

[0036] In some embodiments, the first on-off device 162 and the second on-off device 153 are one-way valves, which makes the device structure simple and reliable.

[0037] Figure 5 A self-sealing liquid nitrogen filling tank 20 is shown, comprising a self-sealing filling mechanism and a liquid nitrogen tank as described in any of the above embodiments. The injection port outlet 161 and the exhaust port inlet 151 are connected to the self-sealing liquid nitrogen filling tank 20. When filling a working fluid (using liquid nitrogen as an example), a working fluid filling pipe 16 is inserted into the working fluid filling port 11 of the self-sealing filling structure. As the working fluid filling pipe 16 moves in a first direction, the linkage member 13 disposed in the first direction of the working fluid filling port 11 is triggered by the working fluid filling pipe 16, synchronously energizing the first on / off device 162 and the second on / off device 153. After the first on-off device 162 is turned on, liquid nitrogen flows from the working fluid filling pipe 16 through the outlet of the injection portion 14 to the self-sealing liquid nitrogen filling tank 20. Due to the low boiling point of liquid nitrogen, it is easy to vaporize. During the filling process, the liquid nitrogen in the self-sealing liquid nitrogen filling tank 20 partially vaporizes into nitrogen gas, causing the air pressure in the self-sealing liquid nitrogen filling tank 20 to increase. At this time, the air pressure in the tank will be greater than atmospheric pressure, which is not conducive to filling. Therefore, the simultaneous turning on of the second on-off device 153 allows the gas in the self-sealing liquid nitrogen filling tank 20 to be discharged to the outside through the exhaust hole 152 of the exhaust portion 15, thereby maintaining the air pressure in the tank. This arrangement allows liquid nitrogen to be filled in a sealed state, preventing moisture in the air from entering the self-sealing liquid nitrogen filling tank 20 during the filling process and forming an ice layer on the tank wall, which affects the storage and subsequent use of the liquid nitrogen.

[0038] Those skilled in the art will readily conceive of alternative embodiments of the present invention after considering the technical solutions disclosed in this specification and in practice. This invention is intended to cover any variations, uses, or adaptations of the invention that adhere to the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as illustrative; the true scope of the invention is indicated by the claims.

Claims

1. A self-sealing filling structure, comprising a working fluid filling port, a sealing cover, a linkage, an injection portion, and an exhaust portion; the working fluid filling port is fixedly arranged on the sealing cover, and a working fluid filling pipe is inserted into the working fluid filling port along a first direction to communicate with the injection portion; the injection portion comprises an injection portion outlet and a first on-off device, and when the first on-off device is turned on, the working fluid filling port is connected to the injection portion outlet; the exhaust portion comprises an exhaust portion inlet, an exhaust hole, and a second on-off device, and when the second on-off device is turned on, the exhaust portion inlet and the exhaust hole are connected; characterized in that The linkage member is arranged in the first direction of the working fluid filling port, and the working fluid filling pipe is inserted into the working fluid filling port along the first direction to trigger the linkage member; and the linkage member is transmission-connected with the first on-off device and the second on-off device to control the first on-off device and the second on-off device to be synchronously turned on or off.

2. The self-sealing filling structure according to claim 1, characterized in that: The injection part also includes a first transmission member, which is in transmission connection with the linkage member to control the on and off of the first on-off device; the exhaust part also includes a second transmission member, which is in transmission connection with the linkage member to control the on and off of the second on-off device.

3. The self-sealing filling structure according to claim 2, characterized in that: The linkage member includes a movable panel, which is hingedly arranged on the inner wall of the injection part and is arranged in the first direction of the working fluid filling port. The working fluid filling pipe is inserted into the working fluid filling port along the first direction. The movable panel is triggered to displace in the first direction to control the first on-off device and the second on-off device to be turned on synchronously.

4. The self-sealing filling structure according to claim 3, characterized in that: The first transmission member includes a connecting rod and a push rod connected in sequence. The connecting rod is connected to the movable panel. When the movable panel is displaced in a first direction, the connecting rod drives the push rod to move in the first direction to turn on the first on-off device.

5. The self-sealing filling structure according to claim 3, characterized in that: The linkage member further comprises a connection hole fixedly arranged on the movable panel, and the connection hole can be displaced in the first direction along with the linkage member.

6. The self-sealing filling structure according to claim 5, characterized in that: The second transmission member includes a transmission rope, one end of the transmission rope is passed through the connecting hole, and the other end of the transmission rope is connected to the second on-off device. When triggered by the displacement of the connecting hole in the first direction, the transmission rope pulls the second on-off device to turn on the second on-off device.

7. The self-sealing filling structure according to claim 6, characterized in that: The drive rope is in driving contact with at least one pulley.

8. The self-sealing filling structure according to claim 1, characterized in that: The first on-off device and the second on-off device are one-way valves.

9. The self-sealing filling structure according to claim 4, characterized in that: A movable pressing block is provided at the fixed end of the push rod, and an elastic member is provided on the first direction of the movable pressing block.

10. A self-sealing liquid nitrogen filling tank, characterized in that: The self-sealing filling structure and the liquid nitrogen tank according to any one of claims 1 to 9 are included, wherein the injection portion outlet and the exhaust portion inlet are connected to the liquid nitrogen tank.

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