Filling valve assembly and filling device

Abstract

The invention discloses a filling valve assembly and a filling device. The filling valve assembly comprises a filling valve body and a power unit. The filling valve body comprises a valve body and a valve element. The power unit comprises a connecting rod and a rubber sleeve; one end of the connecting rod extends into the valve body, is detachably connected with the valve element and is used for driving the valve element to move in the vertical direction so as to open the discharging opening of the valve body; the rubber sleeve is sleeved on the outer wall of the connecting rod, and two ends of the rubber sleeve are respectively clung to the top wall of the inner cavity of the valve body and the end part of the valve core, so that an isolation cavity separated from the inner cavity of the valve body is formed among the rubber sleeve, the valve core and the top wall of the inner cavity of the valve body; wherein the isolation chamber can contract. Through the arrangement, the internal environment and the external environment of the valve body are effectively isolated, the sealing performance between the connecting rod and the valve body is improved, the filling reliability is correspondingly improved, and the requirements of modern industrial production for high quality, high efficiency and high safety are met.

Description

Technical Field

[0001] The invention relates to the field of filling, and in particular to a filling valve assembly and a filling device. Background Art

[0002] In the field of liquid filling, the performance of the filling valve directly affects the efficiency, accuracy and safety of the filling operation. With the continuous improvement of product quality and production environment requirements in various industries, traditional filling valves have exposed many problems in practical applications. For example, in the prior art, the filling valve is equipped with a power device on the outside, such as a cylinder, a motor, etc., which drives the valve core in the valve body to move. Since the power enters from the outside, the valve core is usually connected to the connecting rod extending to the outside of the valve body, so the gap leakage problem at the connection between the connecting rod and the valve body is particularly significant.

[0003] In the past, the design of filling valves often focused on achieving basic filling functions, but lacked sufficient attention and effective solutions for the sealing link between the connecting rod and the valve body. During long-term use, due to the frequent opening and closing operations of the filling valve, the relative movement between the connecting rod and the valve body causes the seals at the connection to gradually wear out, thereby gradually expanding the originally tiny gap. At the same time, factors such as pressure fluctuations, temperature changes, and corrosive components of the liquid during the filling process will also accelerate the aging and damage of the seals, further weakening the sealing performance of the connection.

[0004] This leakage problem has brought many adverse effects to production companies. On the one hand, the leaked liquid not only causes the waste of raw materials and increases production costs, but also may pollute the filling equipment and the surrounding working area, increase the difficulty and cost of cleaning and maintenance, and even affect the normal operation of the entire production line in serious cases. On the other hand, for some industries with strict requirements on hygiene standards, such as food and medicine, the leaked liquid may cause product quality problems and bring potential risks to consumers' health.

[0005] Therefore, a filling valve assembly and a filling device are needed to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a filling valve assembly and a filling device to effectively isolate the internal environment of the valve body from the external environment, improve the sealing performance between the connecting rod and the valve body, so as to correspondingly improve the reliability of filling and meet the requirements of modern industrial production for high quality, high efficiency and high safety.

[0007] In order to solve the above technical problems, the present invention provides a filling valve assembly, including a filling valve body and a power unit;

[0008] The filling valve body comprises a valve body and a valve core;

[0009] The power unit comprises a connecting rod and a rubber sleeve;

[0010] One end of the connecting rod extends into the interior of the valve body and is detachably connected to the valve core, and is used to drive the valve core to move in a vertical direction to open or close the discharge port of the valve body;

[0011] The rubber sleeve is sleeved on the outer wall of the connecting rod, and its two ends are respectively in close contact with the top wall of the inner cavity of the valve body and the end of the valve core, so that an isolation chamber separated from the inner cavity of the valve body is formed between the rubber sleeve, the valve core and the top wall of the inner cavity of the valve body;

[0012] Therein, the isolation chamber is capable of shrinking.

[0013] Furthermore, the connecting rod and the valve core are connected via threads, and an annular tightening block is provided on the outer wall of the connecting rod;

[0014] The inner wall of the rubber sleeve is interference fit with the annular tightening block, so that when the connecting rod and the valve core rotate relatively, the end of the rubber sleeve is squeezed and tightly attached to the valve core under the action of the annular tightening block and the end surface of the valve core.

[0015] Furthermore, the power unit further comprises a threaded coupling sleeved on the outside of the connecting rod and a locking nut rotatably mounted on the surface of the valve body;

[0016] One end of the threaded coupling extends into the valve body and engages with one end of the rubber sleeve, and the other end extends to the outside of the valve body, and the outer wall is threadedly connected to the locking nut;

[0017] When the locking nut rotates, the threaded coupling is driven to move along its axial direction, so that the end of the rubber sleeve can be tightly fixed to the top wall of the inner cavity of the valve body, and the locking nut is tightly fixed to the surface of the valve body.

[0018] Furthermore, the outer wall of the connecting rod is provided with a gas guide groove communicating with the isolation chamber;

[0019] An inflation head is disposed on the outer wall of the locking nut, and the inflation head is in a communicating state with the gas guide groove, and is used for injecting gas into the isolation chamber so that a gap is always reserved between the rubber sleeve and the connecting rod.

[0020] Furthermore, a guide sleeve is embedded and fixedly installed on the inner wall of the threaded coupling, which is used for limiting and guiding the connecting rod.

[0021] Furthermore, a first sealing ring is provided on one side of the locking nut that is in contact with the valve body and on one side that is in contact with the outer wall of the threaded coupling;

[0022] The two first sealing rings are respectively located at the upper and lower sides of the inflation head.

[0023] Further, the power unit also includes a stroke cylinder;

[0024] The output end of the stroke cylinder is connected to the connecting rod through a connecting piece, so as to control the connecting rod to move in a vertical direction.

[0025] Further, the valve body includes a valve housing, a filling head and a bushing;

[0026] One end of the valve housing has a feed port, and the other end is detachably connected to the filling head;

[0027] The valve core is located in the filling head;

[0028] The bushing is threadedly mounted on the outer wall of the valve housing, and has a step portion at the bottom end that engages with the outer wall of the filling head;

[0029] A second sealing ring is provided between the step portion and the filling head and at the connection between the filling head and the valve housing.

[0030] Furthermore, when the bushing is rotated to be connected with the valve housing, the filling head is driven to be connected with the end surface of the valve housing synchronously through the step portion, and the two second sealing rings are deformed.

[0031] In another aspect, the present invention further provides a filling device, comprising a storage tank and a plurality of filling valve assemblies as described in the above embodiments;

[0032] A plurality of groups of the filling valve assemblies are connected to the storage tank via connecting pipes;

[0033] Wherein, the connecting pipe is provided with an electromagnetic flowmeter, a normally closed diaphragm valve and a normally open diaphragm valve in sequence from the direction away from the storage tank;

[0034] The normally open diaphragm valve is provided with a pressure regulating valve.

[0035] Compared with the prior art, the present invention has at least the following beneficial effects:

[0036] By arranging a rubber sleeve, and the rubber sleeve is sleeved on the outside of the connecting rod, and the two ends are respectively tightly attached to the top wall of the inner cavity of the valve body and the end of the valve core, an isolation chamber separated from the inner cavity of the valve body can be formed between the top wall of the inner cavity of the valve body, the rubber sleeve and the end face of the valve core, and the isolation chamber can shrink to ensure that the connecting rod will not interfere with the isolation chamber when driving the valve core to move in the vertical direction, so that the slurry in the chamber formed by the inner cavity of the valve body and the outer wall of the rubber sleeve will never contact the external environment under the barrier effect of the isolation chamber, so that the internal environment of the valve body is isolated from the external environment to ensure that the slurry will not leak, thereby improving the filling reliability and meeting the needs of modern industrial production for high quality, high efficiency and high safety.

[0037] Furthermore, by setting the connecting rod and the valve core to be threadedly connected, and providing an annular tightening block engaged with the rubber sleeve on the outer wall of the connecting rod, when the valve core and the connecting rod rotate relative to each other for connection, one end of the rubber sleeve can be squeezed and tightly attached to the end face of the valve core. In addition, by providing a locking nut and a threaded coupling, and one end of the threaded coupling is engaged with the other end of the rubber sleeve, under the rotation of the locking nut, the threaded coupling moves in the vertical direction, so that the end of the rubber sleeve away from the valve core can better fit the top wall of the inner cavity of the valve body, so as to quickly achieve the limiting of the two ends of the rubber sleeve, thereby ensuring the sealing and isolation effect of the isolation chamber formed by the rubber sleeve, the valve core and the top wall of the inner cavity of the valve body.

[0038] Furthermore, an inflation head is provided on the outer wall of the locking nut to inject gas into the isolation chamber, so that a gap is always reserved between the rubber sleeve and the connecting rod. When the slurry enters the valve body, the rubber sleeve will not adhere to the connecting rod under the squeezing action of the slurry, so as to prevent interference with the subsequent movement of the connecting rod and improve the stability of the device operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a cross-sectional view of a filling valve assembly in one embodiment of the present invention;

[0040] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0041] Figure 3 It is a schematic diagram of the local structure of the abutment between the rubber sleeve of the filling valve assembly and the top wall of the inner cavity of the valve body in one embodiment of the present invention;

[0042] Figure 4 It is a structural schematic diagram of a filling device in another embodiment of the present invention;

[0043] Figure 5 It is a partial side view of a filling device in another embodiment of the present invention.

[0044] Figure Number:

[0045] 1. Filling valve body;

[0046] 11. valve body; 111. valve housing; 112. filling head; 113. bushing;

[0047] 12. Valve core;

[0048] 2. Power unit; 21. Connecting rod; 211. Gas guide groove; 22. Rubber sleeve; 23. Threaded coupling; 231. Guide sleeve; 24. Locking nut; 241. Inflating head; 25. Stroke cylinder;

[0049] 3. Ring tensioning block;

[0050] 4. The first sealing ring;

[0051] 5. Second sealing ring;

[0052] 6. Storage tank;

[0053] 7. Electromagnetic flowmeter;

[0054] 8. Normally closed diaphragm valve;

[0055] 9. Normally open diaphragm valve;

[0056] 10. Pressure regulating valve. DETAILED DESCRIPTION

[0057] The filling valve assembly and filling device of the present invention will be described in more detail below in conjunction with the schematic diagram, wherein the preferred embodiment of the present invention is shown, and it should be understood that the present invention described herein can be modified by a person skilled in the art, while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to a person skilled in the art, and not as a limitation of the present invention.

[0058] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0059] Embodiment 1

[0060] like Figures 1 to 3 As shown, an embodiment of the present invention provides a filling valve assembly, including a filling valve body 1 and a power unit 2.

[0061] The filling valve body 1 comprises a valve body 11 and a valve core 12 , and the valve core 12 is movably mounted at the discharge port of the valve body 11 , so that the discharge port can be opened or closed by moving the valve core 12 in the vertical direction.

[0062] The power unit 2 includes a connecting rod 21 and a rubber sleeve 22 .

[0063] One end of the connecting rod 21 extends into the interior of the valve body 11 and is detachably connected to the valve core 12, and is used to drive the valve core 12 to move in the vertical direction to open or close the discharge port of the valve body 11. The filling of the slurry is achieved by opening the discharge port of the valve body 11.

[0064] Among them, the rubber sleeve 22 is sleeved on the outer wall of the connecting rod 21, and its two ends are respectively tightly attached to the top wall of the inner cavity of the valve body 11 and the end of the valve core 12, so that an isolation chamber separated from the inner cavity of the valve body 11 is formed between the rubber sleeve 22, the valve core 12 and the top wall of the inner cavity of the valve body 11.

[0065] The connecting rod 21 and the valve body 11 are wrapped by an isolation chamber, so that the slurry in the chamber formed by the inner cavity of the valve body 11 and the outer wall of the rubber sleeve 22 will never come into contact with the external environment due to the barrier effect of the isolation chamber, thereby ensuring that the slurry will not leak from the gap connection between the connecting rod 21 and the valve body 11 to cause pollution, thereby meeting the requirements of modern industrial production for high quality, high efficiency and high safety.

[0066] It should be noted that the isolation chamber can shrink to ensure that when the connecting rod 21 drives the valve core 12 to move in the vertical direction, the isolation chamber will not interfere with the movement of the connecting rod 21, thereby ensuring the smooth operation of the device.

[0067] In a specific example, the rubber sleeve 22 can be made of a flexible material to achieve the function of shrinking the isolation chamber.

[0068] like Figure 2 As shown, in a further embodiment, in order to facilitate the squeezing and tight fit between the rubber sleeve 22 and the end face of the valve core 12, the connection relationship between the connecting rod 21 and the valve core 12 is further limited, and an annular tightening block 3 is added to enhance the stability of the connection between the rubber sleeve 22 and the end face of the valve core 12.

[0069] Specifically, the connecting rod 21 and the valve core 12 are connected via threads, that is, the valve core 12 and the connecting rod 21 can rotate relative to each other to achieve self-locking.

[0070] Among them, the annular tightening block 3 is arranged on the outer wall of the connecting rod 21, and the inner wall of the rubber sleeve 22 is interference fit with the annular tightening block 3, so that when the connecting rod 21 and the valve core 12 rotate relative to each other, under the action of the annular tightening block 3 and the end face of the valve core 12, the end of the rubber sleeve 22 is squeezed and tightly attached to the valve core 12.

[0071] It should be particularly noted that an annular clamping cavity is formed between the raised portion of the annular tensioning block 3 and the end face of the valve core 12. When the connecting rod 21 and the valve core 12 rotate relative to each other, the height of the annular clamping cavity gradually decreases to complete the clamping of the rubber sleeve 22, so that the end of the rubber sleeve 22 fits tightly against the valve core 12.

[0072] like Figure 3 As shown, in a further embodiment, the power unit 2 is further limited to better achieve the locking fit between the end of the rubber sleeve 22 away from the valve core 12 and the top wall of the inner cavity of the valve body 11, thereby improving the sealing performance of the isolation chamber.

[0073] The power unit 2 further includes a threaded coupling 23 sleeved on the outside of the connecting rod 21 and a locking nut 24 rotatably mounted on the surface of the valve body 11 .

[0074] Among them, one end of the threaded coupling 23 extends into the valve body 11 and is engaged with one end of the rubber sleeve 22, and the other end extends to the outside of the valve body 11, and the outer wall is threadedly connected to the locking nut 24. The end of the rubber sleeve 22 is driven to move by the movement of the threaded coupling 23 until the end of the rubber sleeve 22 moves to be in close contact with the top wall of the inner cavity of the valve body 11.

[0075] Specifically, when the locking nut 24 rotates, it drives the threaded coupling 23 to move along its axial direction (i.e., the vertical direction), so that the end of the rubber sleeve 22 can be tightly fixed to the top wall of the inner cavity of the valve body 11, while the locking nut 24 is tightly fixed to the surface of the valve body 11, that is, the gap formed between the locking nut 24 and the rubber sleeve 22 is consistent with the thickness of the top wall and the upper surface of the inner cavity of the valve body 11, thereby completing the locking function.

[0076] The device is provided with a threaded connection between the connecting rod 21 and the valve core 12, and an annular tension block 3 engaged with the rubber sleeve 22 is provided on the outer wall of the connecting rod 21, so that when the valve core 12 and the connecting rod 21 rotate relative to each other for connection, one end of the rubber sleeve 22 can be pressed and tightly attached to the end face of the valve core 12. In addition, a locking nut 24 and a threaded coupling 23 are provided, and one end of the threaded coupling 23 is engaged with the other end of the rubber sleeve 22, so that under the rotation of the locking nut 24, the threaded coupling 23 moves in the vertical direction, so that the end of the rubber sleeve 22 away from the valve core 12 can better fit the top wall of the inner cavity of the valve body 11, so as to quickly achieve the limiting of the two ends of the rubber sleeve 22, thereby ensuring the sealing isolation effect of the isolation chamber formed by the rubber sleeve 22, the valve core 12 and the top wall of the inner cavity of the valve body 11.

[0077] Please continue reading Figure 3In other embodiments, when the slurry is inside the valve body 11, it will form an extrusion force on the rubber sleeve 22, forcing the rubber sleeve 22 to deform in the direction close to the connecting rod 21, thereby forming adhesion with the connecting rod 21, and then when the connecting rod 21 is running (that is, when moving in the vertical direction), friction will be generated between the rubber sleeve 22, so that the slurry may leak from the damaged part of the rubber sleeve 22. Therefore, an inflation head 241 is additionally provided to prevent the rubber sleeve 22 from adhering to the connecting rod 21 and interfering with the operation of the connecting rod 21, and preventing the rubber sleeve 22 from being damaged by friction.

[0078] Specifically, the outer wall of the connecting rod 21 is provided with a gas guide groove 211 communicating with the isolation chamber, so as to better inject gas into the isolation chamber.

[0079] Among them, an inflation head 241 is provided on the outer wall of the locking nut 24, and the inflation head 241 is in a connected state with the gas guide groove 211, and is used to inject gas into the isolation chamber, that is, by injecting gas, the rubber sleeve 22 is filled, so that a gap is always reserved between the rubber sleeve 22 and the connecting rod 21, thereby effectively ensuring that the connecting rod 21 will not cause friction due to the adhesion of the rubber sleeve 22 during operation, thereby improving the stability of the operation of the device.

[0080] It should be noted that since the connecting rod 21 will come into contact with the outside world when moving, the isolation chamber will slowly leak. Therefore, the inflation head 241 is always in a gas injection state when injecting gas, and the amount of gas injection needs to be adjusted according to the filling state of the rubber sleeve 22. This is the existing technology, so it will not be elaborated here.

[0081] In other embodiments, a guide sleeve 231 is embedded and fixedly installed on the inner wall of the threaded coupling 23, which is used for limiting and guiding the connecting rod 21 to guide the connecting rod 21 to run along a predetermined trajectory, and can reduce the wear of the connecting rod 21 and extend the service life of the connecting rod 21.

[0082] In a further embodiment, in order to prevent the gas injected into the isolation chamber from leaking too quickly, resulting in a waste of gas resources, the locking nut 24 is further limited to improve the sealing effect.

[0083] Specifically, the first sealing ring 4 is provided on one side of the locking nut 24 that is in contact with the valve body 11 and on the other side that is in contact with the outer wall of the threaded coupling 23 , wherein two first sealing rings 4 are respectively located on the upper and lower sides of the inflation head 241 .

[0084] In other embodiments, the power unit 2 further includes a stroke cylinder 25, and an output end of the stroke cylinder 25 is connected to the connecting rod 21 through a connecting piece, so as to control the connecting rod 21 to move in a vertical direction.

[0085] In this embodiment, a combined valve body 11 is also proposed to facilitate the connection between the valve core 12 and the connecting rod 21 and to facilitate disassembly, replacement and maintenance. The combined valve body 11 design makes cleaning and disinfection operations more thorough and convenient. Each component can be disassembled separately for cleaning and disinfection to ensure that there are no dead corners left, thereby effectively avoiding bacterial growth and cross contamination.

[0086] Specifically, the valve body 11 includes a valve housing 111 , a filling head 112 and a bushing 113 .

[0087] One end of the valve housing 111 has a feed port, and the other end is detachably connected to the filling head 112 , and the valve core 12 is located inside the filling head 112 .

[0088] The bushing 113 is threadedly mounted on the outer wall of the valve housing 111, and has a step portion at the bottom end that engages with the outer wall of the filling head 112. The filling head 112 is connected to the valve housing 111 through the threaded installation of the bushing 113 and with the support of the step portion.

[0089] In addition, a second sealing ring 5 is provided between the step portion and the filling head 112 and at the connection between the filling head 112 and the valve housing 111 .

[0090] When the bushing 113 rotates to connect with the valve housing 111, the filling head 112 is driven by the step portion to synchronously connect with the end surface of the valve housing 111, and the two second sealing rings 5 ​​are deformed to ensure the sealing effect of the connection between the components, prevent slurry leakage, and ensure safety.

[0091] In this embodiment, by providing a valve housing 111, a filling head 112, a bushing 113 and a valve body 11, the valve body 11 structure which is arranged as an integral part in the prior art is split into multiple components, and the multiple components can be connected through the bushing 113, so as to achieve the purpose of facilitating the disassembly and replacement of a single component.

[0092] Furthermore, due to the detachable connection between the filling head 112 and the valve housing 111, the valve core 12 and the connecting rod 21 can be connected in advance, and then the filling head 112 and the valve housing 111 can be assembled, so as to achieve the purpose of simple installation of the overall device.

[0093] In addition, due to the detachable connection between the filling head 112 and the valve housing 111, different filling heads 112 can be selectively installed according to needs to achieve different filling application scenarios.

[0094] Embodiment 2

[0095] like Figure 4 and Figure 5 As shown, this embodiment further proposes a filling device based on the first embodiment, including a storage tank 6 and a plurality of filling valve assemblies described in the first embodiment.

[0096] The multiple groups of filling valve assemblies are connected to the storage tank 6 through connecting pipes.

[0097] The connecting pipe is provided with an electromagnetic flowmeter 7 , a normally closed diaphragm valve 8 and a normally open diaphragm valve 9 in sequence from the direction away from the storage tank 6 , and a pressure regulating valve 10 is provided on the normally open diaphragm valve 9 .

[0098] By sequentially arranging an electromagnetic flowmeter 7, a normally closed diaphragm valve 8 and a normally open diaphragm valve 9 on the connecting pipe, and using the normally closed diaphragm valve 8 as a sealing device when stationary, a closed structure can be formed between the normally closed diaphragm valve 8 and the valve body 11. Therefore, a pressure regulating valve 10 is provided on the normally open diaphragm valve 9 to perform real-time feedback adjustment of the pressure, which can effectively ensure the stability of the subsequent filling process of the filling valve assembly.

[0099] Furthermore, by providing a filling device including the filling valve assembly of the first embodiment, the internal environment of the valve body 11 can be effectively isolated from the external environment, and the sealing performance between the connecting rod 21 and the valve body 11 can be improved, thereby correspondingly improving the reliability of filling and meeting the requirements of modern industrial production for high quality, high efficiency and high safety.

[0100] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A filling valve assembly, characterized in that: It includes a filling valve body and a power unit; The filling valve body comprises a valve body and a valve core; The power unit comprises a connecting rod and a rubber sleeve; One end of the connecting rod extends into the interior of the valve body and is detachably connected to the valve core, and is used to drive the valve core to move in a vertical direction to open or close the discharge port of the valve body; The rubber sleeve is sleeved on the outer wall of the connecting rod, and its two ends are respectively in close contact with the top wall of the inner cavity of the valve body and the end of the valve core, so that an isolation chamber separated from the inner cavity of the valve body is formed between the rubber sleeve, the valve core and the top wall of the inner cavity of the valve body; Therein, the isolation chamber is capable of shrinking.

2. The filling valve assembly according to claim 1, characterized in that: The connecting rod is connected to the valve core through threads, and an annular tightening block is provided on the outer wall of the connecting rod; The inner wall of the rubber sleeve is interference fit with the annular tightening block, so that when the connecting rod and the valve core rotate relatively, the end of the rubber sleeve is squeezed and tightly attached to the valve core under the action of the annular tightening block and the end surface of the valve core.

3. The filling valve assembly according to claim 1, characterized in that: The power unit also includes a threaded coupling sleeved on the outside of the connecting rod and a locking nut rotatably mounted on the surface of the valve body; One end of the threaded coupling extends into the valve body and engages with one end of the rubber sleeve, and the other end extends to the outside of the valve body, and the outer wall is threadedly connected to the locking nut; When the locking nut rotates, the threaded coupling is driven to move along its axial direction, so that the end of the rubber sleeve can be tightly fixed to the top wall of the inner cavity of the valve body, and the locking nut is tightly fixed to the surface of the valve body.

4. The filling valve assembly according to claim 3, characterized in that: The outer wall of the connecting rod is provided with a gas guide groove communicating with the isolation chamber; An inflation head is disposed on the outer wall of the locking nut, and the inflation head is in a communicating state with the gas guide groove, and is used for injecting gas into the isolation chamber so that a gap is always reserved between the rubber sleeve and the connecting rod.

5. The filling valve assembly according to claim 3, characterized in that: A guide sleeve is embedded and fixedly installed on the inner wall of the threaded coupling, which is used for limiting and guiding the connecting rod.

6. The filling valve assembly according to claim 4, characterized in that: A first sealing ring is provided on one side of the locking nut that is in contact with the valve body and on one side that is in contact with the outer wall of the threaded coupling; The two first sealing rings are respectively located at the upper and lower sides of the inflation head.

7. The filling valve assembly according to claim 1, characterized in that: The power unit also includes a stroke cylinder; The output end of the stroke cylinder is connected to the connecting rod through a connecting piece, so as to control the connecting rod to move in a vertical direction.

8. The filling valve assembly according to claim 1, characterized in that: The valve body comprises a valve housing, a filling head and a bushing; One end of the valve housing has a feed port, and the other end is detachably connected to the filling head; The valve core is located in the filling head; The bushing is threadedly mounted on the outer wall of the valve housing, and has a step portion at the bottom end that engages with the outer wall of the filling head; A second sealing ring is provided between the step portion and the filling head and at the connection between the filling head and the valve housing.

9. The filling valve assembly according to claim 8, characterized in that: When the bushing rotates to be connected with the valve housing, the filling head is driven to be connected with the end surface of the valve housing synchronously through the step portion, and the two second sealing rings are deformed.

10. A filling device, characterized in that: It comprises a storage tank and a plurality of filling valve assemblies as claimed in any one of claims 1 to 9; A plurality of groups of the filling valve assemblies are connected to the storage tank via connecting pipes; Wherein, the connecting pipe is provided with an electromagnetic flowmeter, a normally closed diaphragm valve and a normally open diaphragm valve in sequence from the direction away from the storage tank; The normally open diaphragm valve is provided with a pressure regulating valve.

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