Automatic sterilizing agent filling device

Abstract

The invention relates to the technical field of automatic filling, in particular to an automatic sterilizing agent filling device which comprises a nozzle mechanism, a valve sleeve, a valve rod and a thrust assembly. The nozzle mechanism comprises a main pipe and a nozzle connected to the bottom end of the main pipe, and the top end of the nozzle is connected with a core pipe; the core pipe is vertically upwards close to the top end of the main pipe along the axis of the main pipe, a solid seat is arranged in the core pipe, a pipe cavity of the core pipe is divided into an upper pipe cavity and a lower pipe cavity by the solid seat, a first channel is formed from the pipe wall of the core pipe to the lower pipe cavity, and a second channel is formed in the lower pipe cavity. A second channel is formed from the cavity wall of the upper pipe cavity to the first channel, and the pipe wall of the valve sleeve slides on the cavity wall of the main pipe in a damping mode, so that the closing reliability is enhanced, the adaptability to different liquid supply pressure ranges is effectively expanded, and particularly, higher compatibility is shown under the low-pressure working condition.

Description

Technical Field

[0001] This invention relates to the field of automatic filling technology, and in particular to an automatic filling device for bactericides. Background Technology

[0002] Filling machinery is a type of packaging machine that fills objects with liquids. In terms of automation, it can be divided into semi-automatic filling machines and fully automatic filling production lines. From the perspective of packaging materials, it can be divided into liquid filling machines, paste filling machines, powder filling machines, and granule filling machines.

[0003] Chinese Patent Application No. 202421929963.5 discloses an automatic filling device for the production of wheat Fusarium fungicide. It has a valve core-type sealing component installed in a tubular nozzle. The sealing ball in the component is elastically set in the cavity of the tubular nozzle by a spring and a connecting rod. When external liquid is injected, it pushes the sealing ball down into the large diameter at the bottom of the nozzle. At this time, a gap is formed between the sealing ball and the large diameter (opening the valve) and the liquid is injected into the filling device. When the external liquid stops being injected, the sealing ball automatically returns to the initial position under the upward pull of the spring and the connecting rod, blocking the cavity (closing the valve). As can be seen from the above, the existing filling device is actually a single valve core structure, which will produce the following technical defects: On the one hand, the sealing ball only retracts to the middle position of the nozzle cavity, resulting in a large amount of liquid being trapped in the upper cavity of the nozzle, causing incomplete discharge of the medicine; on the other hand, the single valve core design can only be adapted to the liquid supply system within a specific pressure range. When the liquid supply pressure of the external liquid supply device is low, the sealing ball cannot be effectively opened or closed, causing the device to be unstable and severely limiting its applicability and connection compatibility in different production environments. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an automatic disinfectant filling device, comprising a nozzle mechanism, a valve sleeve, a valve stem, and a thrust assembly. The nozzle mechanism includes a main pipe and a nozzle connected to the bottom end of the main pipe. A core tube is connected to the top end of the nozzle. The core tube extends vertically upwards along the axis of the main pipe towards the top end of the main pipe. A solid seat is provided inside the core tube, dividing the cavity of the core tube into an upper cavity and a lower cavity. A first channel is formed from the wall of the core tube to the lower cavity, and a first channel is formed from the wall of the upper cavity to the first channel. The valve sleeve has a second channel. The valve sleeve slides in a damped manner on the cavity wall of the main pipe, and the cavity wall slides in a damped manner on the tube wall of the core tube to close the outer end of the first channel. The valve stem slides in a damped manner in the upper tube cavity to close the second channel. The thrust assembly is disposed on the bottom side of the valve sleeve and the valve stem to provide thrust to the valve sleeve and the valve stem, so that the top ends of the valve sleeve and the valve stem reach the top end of the main pipe. The thrust force exerted by the thrust assembly on the valve stem is less than the thrust force exerted on the valve sleeve.

[0005] As a further preferred embodiment, the nozzle has a first stepped portion, the valve sleeve has a second stepped portion, the thrust assembly includes a first return spring, the first return spring is filled in the main pipe, its bottom end is elastically supported downward on the first stepped portion, and its top end is elastically supported upward on the second stepped portion. The valve stem includes a thin rod portion and a damping portion. The thin rod portion passes through the solid seat and enters the lower tube cavity. The damping portion is connected to the top end of the thin rod portion and fits against the cavity wall of the upper tube cavity. The thrust assembly also includes a second return spring, the outer periphery of the thin rod portion is sleeved with the second return spring, and the upper and lower ends of the second return spring are elastically supported between the damping portion and the solid seat. The supporting force of the second return spring is less than the supporting force of the first return spring.

[0006] As a further preferred embodiment, the nozzle is a pointed tip that tapers downwards, and the bottom end of the core tube is tightly inserted into the nozzle.

[0007] As a further preferred embodiment, the outer end of the first channel is inclined upward through the solid seat and penetrates the tube wall of the core tube, and the inner end is inclined downward through the lower tube cavity; the outer end of the second channel is inclined downward through the first channel, and the inner end is inclined upward through the upper tube cavity.

[0008] As a further preferred embodiment, the first channel is arranged in a ring array at three locations on the core tube, and the second channel is arranged in a ring array at three locations on the core tube, with each location of the first channel corresponding to a second channel.

[0009] As a further preferred embodiment, the top of the main pipe is provided with a flange connection.

[0010] As a further preferred embodiment, under the pushing action of the first return spring, the top end of the valve sleeve rises to be flush with the top surface of the flange connection, and the damping portion of the valve stem rises to be flush with the top surface of the flange connection under the pushing action of the second return spring.

[0011] As a further preferred embodiment, the bottom periphery of the main tube is connected to a connecting ring, and the bottom of the connecting ring is provided with an annular groove.

[0012] The advantages of this invention compared to the prior art are: A core tube is installed inside the main pipe of the device, and a valve sleeve is installed around the core tube. The core tube is divided into upper and lower chambers. A valve stem is installed in the upper chamber. The valve sleeve and valve stem constitute the two valve core structures of the device. A first channel and a second channel are opened between the two, forming two liquid discharge channels that match the two valve cores respectively. When the hydraulic pressure of the external liquid exceeds the supporting force of the thrust assembly, it will definitely exceed the supporting force of the thrust assembly on the valve stem. Then, the valve sleeve slides down along the wall of the main pipe and the core tube to the bottom of the highest point of the first channel, and the valve stem will also descend along the upper chamber to the bottom of the highest point of the second channel, so that the first and second channels open simultaneously, and filling is completed through the dual valve cores. When the hydraulic pressure of the external liquid is greater than the supporting force of the thrust assembly where the valve stem is located but less than the supporting force of the thrust assembly where the valve sleeve is located, the valve stem descends, still allowing the first and second channels to remain unobstructed. The liquid flows into the first channel through the second channel. This dual-valve structure, through segmented control, not only enhances the reliability of closure but also effectively expands the adaptability to different liquid supply pressure ranges, especially exhibiting higher compatibility under low-pressure conditions. Attached Figure Description

[0013] Figure 1 A schematic diagram from a first-view perspective of an automatic bactericide filling device provided for an embodiment of the present invention; Figure 2 A top view schematic diagram of an automatic bactericide filling device provided for an embodiment of the present invention; Figure 3 An automatic bactericide filling device provided for embodiments of the present invention comprises... Figure 2 A schematic diagram of the front view after sectioning A. Figure 4 An automatic bactericide filling device provided for embodiments of the present invention comprises... Figure 3 A schematic diagram from a three-dimensional perspective; Figure 5 An automatic bactericide filling device provided for embodiments of the present invention comprises... Figure 4 Enlarged schematic diagram of section B; Figure 6 An automatic bactericide filling device provided for embodiments of the present invention comprises... Figure 1 The diagram shows the disassembled components. In the diagram: 1. Nozzle mechanism; 2. Valve sleeve; 3. Valve stem; 4. Main pipe; 5. Nozzle; 6. Core tube; 7. Solid seat; 8. Upper cavity; 9. Lower cavity; 10. First channel; 11. Second channel; 12. First step; 13. Second step; 14. First return spring; 15. Thin rod section; 16. Damping section; 17. Second return spring; 18. Flange connection; 19. Connecting ring; 20. Annular groove. Detailed Implementation

[0014] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0015] In one implementation, such as Figures 1-6 As shown: This embodiment provides an automatic disinfectant filling device, including a nozzle mechanism 1, a valve sleeve 2, a valve stem 3, and a thrust assembly. The nozzle mechanism 1 includes a main pipe 4 and a nozzle 5 connected to the bottom end of the main pipe 4. A core tube 6 is connected to the top end of the nozzle 5. The core tube 6 extends vertically upward along the axis of the main pipe 4 towards the top end of the main pipe 4. A solid seat 7 is provided inside the core tube 6, which divides the cavity of the core tube 6 into an upper cavity 8 and a lower cavity 9. A first channel 10 is opened from the wall of the core tube 6 to the lower cavity 9, and a first channel 10 is opened from the wall of the upper cavity 8 to the first channel 10. The valve sleeve 2 has a second channel 11. The valve sleeve 2 slides in a damped manner on the cavity wall of the main pipe 4 and slides in a damped manner on the wall of the core tube 6 to close the outer end of the first channel 10. The valve stem 3 slides in a damped manner in the upper cavity 8 to close the second channel 11. The thrust assembly is located on the bottom side of the valve sleeve 2 and the valve stem 3 to provide thrust to the valve sleeve 2 and the valve stem 3 so that the top of the valve sleeve 2 and the valve stem 3 reaches the top of the main pipe 4. The thrust force of the thrust assembly acting on the valve stem 3 is less than the thrust force acting on the valve sleeve 2.

[0016] The nozzle mechanism 1 is the basic structure for drug delivery and control. The core tube 6 is located inside the main tube 4, and its bottom end is fixedly connected to the nozzle 5 to form a drug flow path, ensuring the stability and sealing of the drug flow path. A solid seat 7 divides the cavity of the core tube 6 into an independent upper cavity 8 and a lower cavity 9, forming the basis for the dual-valve structure and dual-passage installation. The first channel 10 extends from the wall of the core tube 6 through the solid seat 7 to the lower cavity 9 of the core tube 6. Together with the valve sleeve 2, it constitutes the first valve core of the device and the first drug discharge channel matched with this valve core. Similarly, the second channel 11 extends from the wall of the upper cavity 8 to the first channel 10. Together with the valve stem 3, it constitutes the second valve core of the device and the second drug discharge channel matched with this valve core.

[0017] The working principle of this embodiment is as follows: The automatic filling device for the bactericide achieves precise filling and complete emptying of the liquid through the coordinated action of the nozzle mechanism 1, valve sleeve 2, valve stem 3, and thrust assembly. The nozzle mechanism 1 serves as the core frame, with the main pipe 4 and nozzle 5 forming the main channel for liquid flow. The core tube 6 extends from the top of the nozzle 5 to the top of the main pipe 4. In use, the flange connection 18 at the top of the main pipe 4 is connected to the source pipe, similar to the use of a controllable valve. When the hydraulic pressure of the external liquid exceeds the supporting force of the thrust assembly, it will definitely exceed the supporting force of the thrust assembly on the valve stem 3. Then, the valve sleeve 2 slides down along the wall of the main pipe 4 and the wall of the core tube 6 to the bottom of the highest point of the first channel 10. The valve stem 3 will also descend along the upper tube 8 to the bottom of the highest point of the second channel 11, so that the first channel 10 and the second channel 11 open at the same time. The liquid is discharged into the lower tube 9 of the core tube 6 through the first channel 10 and the second channel 11, and then the bottom nozzle 5 completes the filling of the container. This action state is the dual-channel filling completed by the double valve core when used in a high-pressure environment.

[0018] After high-pressure filling, the external liquid pressure disappears, and the thrust assembly comes into play. Located on the bottom of valve sleeve 2 and valve stem 3, it provides an upward thrust, pushing valve sleeve 2 and valve stem 3 to the top of the main pipe 4. During this process, valve sleeve 2 seals the outer end of the first channel 10, blocking the leakage path of the liquid, and uses the damping wall to drain the residual liquid in the main pipe 4 cavity to the top. Meanwhile, valve stem 3 seals the second channel 11, ensuring that the flow path between the upper pipe cavity 8 and the first channel 10 is cut off, and also uses the damping wall to drain the liquid in the upper pipe cavity 8 to the top. Specifically, the design of the thrust assembly allows valve sleeve 2 and valve stem 3 to be pushed to the highest position even without liquid pressure, thus completely emptying the residual liquid and solving the problem of incomplete drainage caused by liquid retention in the valve core structure in existing technologies.

[0019] In addition, when the hydraulic pressure of the external liquid is greater than the supporting force of the thrust assembly where the valve stem 3 is located but less than the supporting force of the thrust assembly where the valve sleeve 2 is located, although the liquid pressure cannot push the valve sleeve 2 downward and cannot exit through the first channel 10, it can still push the valve stem 3 down, allowing it to descend along the upper tube 8 to the bottom of the highest point of the second channel 11. This still ensures that the first and second channels 10 are unobstructed internally, allowing the liquid to flow into the first channel 10 through the second channel 11 and then into the lower tube 9 of the core tube 6. Finally, the bottom nozzle 5 completes the filling of the container. This dual-valve structure, through segmented control, not only enhances the reliability of closure but also effectively expands the adaptability to different liquid supply pressure ranges, especially exhibiting higher compatibility under low-pressure conditions. The coordinated operation of the dual-valve structure also improves the device's response to lower liquid supply pressures, enabling it to operate stably under a wider range of operating conditions.

[0020] like Figures 3 to 5 As shown, in another embodiment, the nozzle 5 has a first stepped portion 12, the valve sleeve 2 has a second stepped portion 13, and the thrust assembly includes a first return spring 14. The first return spring 14 is filled in the main pipe 4, its bottom end is elastically supported downward on the first stepped portion 12, and its top end is elastically supported upward on the second stepped portion 13. The valve stem 3 includes a thin rod portion 15 and a damping portion 16. The thin rod portion 15 passes through the solid seat 7 and enters the lower tube cavity 9. The damping portion 16 is connected to the top end of the thin rod portion 15 and fits on the cavity wall of the upper tube cavity 8. The thrust assembly also includes a second return spring 17. The second return spring 17 is sleeved around the thin rod portion 15. The upper and lower ends of the second return spring 17 are elastically supported between the damping portion 16 and the solid seat 7. The supporting force of the second return spring 17 is less than the supporting force of the first return spring 14.

[0021] In this embodiment, the precise step-by-step reset of the valve sleeve 2 and valve stem 3 is achieved through the ingenious design of a double reset spring system. The first reset spring 14 forms a bidirectional elastic support structure within the main tube 4, with its bottom end supported by the first step 12 and its top end supported by the second step 13. This support method ensures that the spring can accurately transmit thrust to the valve sleeve 2 during compression, avoiding the situation where the valve sleeve 2 fails to reset properly due to the offset of the support point. When external liquid is injected, the first reset spring 14 is compressed and deformed, storing elastic potential energy; when the liquid supply stops, the spring releases energy to push the valve sleeve 2 to reset quickly, completely sealing the outer end of the first channel 10 while resetting the valve sleeve 2. The second reset spring 17 is sleeved around the thin rod portion 15, with its upper and lower ends elastically supported between the piston portion and the solid seat 7, respectively. This independent elastic support system ensures that the reset movement of the valve stem 3 is completely unaffected by the valve sleeve 2. When the liquid supply pressure changes, the second return spring 17 automatically adjusts the stroke of the valve stem 3 according to the pressure magnitude. This avoids leakage caused by insufficient pressure preventing the valve stem 3 from fully returning to its original position, and also prevents jamming of the valve stem 3 due to excessive pressure. Through this technical solution, the problems of liquid residue and pressure compatibility are effectively solved, achieving adaptive filling over a wide pressure range. The supporting force of the second return spring 17 is less than that of the first return spring 14. This is to ensure that the hydraulic resistance of the valve sleeve 2 is higher than that of the valve stem 3, allowing the valve core to be adapted to both high-pressure and low-pressure liquid supply environments.

[0022] like Figure 1 , Figure 3 As shown, in another embodiment, the nozzle 5 is a tapered tip that tapers downwards, and the bottom end of the core tube 6 is tightly inserted into the nozzle 5. The purpose is to reduce the stagnation area during the flow of the liquid through a smooth geometric transition, avoiding the risk of dripping and corrosion caused by liquid residue. The tight insertion of the core tube 6 aims to eliminate the risk of leakage or buildup at the interface between the nozzle 5 and the core tube 6.

[0023] like Figures 3 to 5 As shown, in another embodiment, the outer end of the first channel 10 is inclined upward through the solid seat 7 and through the tube wall of the core tube 6, and the inner end is inclined downward through the lower tube cavity 9. The outer end of the second channel 11 is inclined downward through the first channel 10, and the inner end is inclined upward through the upper tube cavity 8.

[0024] In this embodiment, the inclined design of the first channel 10 and the second channel 11 achieves dynamic optimization of the liquid flow path. Simultaneously, the first channel 10 and the second channel 11 are closely connected within the same solid seat 7. This inclined structure avoids the liquid seal retention problem caused by gravity and surface tension in vertical channels. The close connection between the inclined channels 10 and 11 reduces eddies and dead zones at corners, thereby improving the discharge efficiency. Furthermore, the aforementioned inclined channel structure, in conjunction with the thrust assembly, not only ensures filling sealing but also guarantees complete discharge of the liquid, solving the problems of dripping and corrosion, while significantly improving the reliability and service life of the equipment.

[0025] In another implementation, the first channel 10 is a ring array at three locations on the core tube 6, and the second channel 11 is a ring array at three locations on the core tube 6, with each location of the first channel 10 corresponding to a second channel 11.

[0026] In this embodiment, by setting three annular arrays of first channels 10 on the core tube 6, the liquid medicine can flow out simultaneously from multiple symmetrical positions, effectively avoiding the local flow rate differences and liquid medicine residue problems that are prone to occur in single-channel structures. The second channels 11 are also arranged in annular arrays in three places, forming a one-to-one correspondence with the first channels 10, ensuring that all channels open synchronously when the valve is opened and close synchronously when the valve is closed, thereby maintaining the stability and consistency of fluid control. When external liquid medicine is injected, the multi-channel synchronous response can adapt to different supply pressure ranges, significantly improving the emptying effect of the liquid medicine in the nozzle 5 while ensuring the stability of the filling process.

[0027] like Figures 3 to 5 As shown, in another embodiment, the top of the main pipe 4 is provided with a flange connection 18. Under the pushing action of the first return spring 14, the top of the valve sleeve 2 rises to be flush with the top surface of the flange connection 18, and the damping part 16 of the valve stem 3 rises to be flush with the top surface of the flange connection 18 under the pushing action of the second return spring 17.

[0028] The first return spring 14 is an elastic element, which can be implemented using a cylindrical spring. Its purpose is to provide a stable thrust through elastic force to ensure that the valve sleeve 2 can be accurately reset. The second return spring 17 is also an elastic element, implemented using a cylindrical spring. Its purpose is to provide an independent reset force for the piston part of the valve stem 3, thereby ensuring the sealing of the second channel 11. The flange connection 18 refers to the connection structure located at the top of the main pipe 4. It can be in the form of a flat flange or a flange flange. Its purpose is to provide a precise positioning reference for the top of the valve sleeve 2 and the valve stem 3, so that after the entire device is connected to the pipeline of the liquid supply equipment, the top of the valve sleeve 2 and the valve stem 3 are directly close to the pipe opening.

[0029] This technical solution uses two independent spring systems to control the reset positions of the valve sleeve 2 and valve stem 3, ensuring that both rise synchronously to a state flush with the top surface of the flange connection 18. The elastic force of the first reset spring 14 acts on the valve sleeve 2, ensuring that its top end precisely reaches the top surface of the flange connection 18. This design effectively avoids situations where the valve sleeve 2 fails to completely cover the outer end of the first channel 10 due to mechanical tolerances or external force interference, thus ensuring that the liquid medicine in the lower cavity 9 can be discharged unimpeded into the connected pipeline. At the same time, the elastic force of the second reset spring 17 acts on the piston part of the valve stem 3, causing it to rise to a position flush with the top surface of the flange connection 18. The independent spring system ensures that the piston part fits tightly against the wall of the upper cavity 8, eliminating any possible tiny gaps in the second channel 11, allowing the liquid medicine in the upper cavity 8 to be completely discharged into the connected pipeline.

[0030] like Figure 3 , Figure 4 As shown, in another embodiment, a connecting ring 19 is connected to the bottom periphery of the main pipe 4, and an annular groove 20 is provided at the bottom of the connecting ring 19. The connecting ring 19 is an annular structure arranged around the bottom periphery of the main pipe 4, and the purpose of providing a groove at its bottom is to provide an additional connection point for the filling device (e.g., a container) during use.

[0031] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0032] The "damping" mentioned in this invention can be understood as the presence of a sealing ring or O-ring between the relevant sliding contact surfaces. The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of this invention. It should be understood that the above descriptions are merely specific embodiments of this invention and are not intended to limit the scope of protection of this invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention for those skilled in the art.

Claims

1. An automatic filling device for a bactericide, characterized in that, The assembly includes a nozzle mechanism (1), a valve sleeve (2), a valve stem (3), and a thrust assembly. The nozzle mechanism (1) includes a main pipe (4) and a nozzle (5) connected to the bottom end of the main pipe (4). A core tube (6) is connected to the top end of the nozzle (5). The core tube (6) extends vertically upward along the axis of the main pipe (4) towards the top end of the main pipe (4). A solid seat (7) is provided inside the core tube (6). The solid seat (7) divides the cavity of the core tube (6) into an upper cavity (8) and a lower cavity (9). A first channel (10) is opened from the wall of the core tube (6) to the lower cavity (9), and a second channel is opened from the wall of the upper cavity (8) to the first channel (10). The valve sleeve (2) slides in a damped manner on the cavity wall of the main pipe (4), and slides in a damped manner on the wall of the core tube (6) to close the outer end of the first channel (10). The valve stem (3) slides in a damped manner in the upper cavity (8) to close the second channel (11). The thrust assembly is located on the bottom side of the valve sleeve (2) and the valve stem (3) to provide thrust to the valve sleeve (2) and the valve stem (3) so that the top of the valve sleeve (2) and the valve stem (3) reaches the top of the main pipe (4). The thrust of the thrust assembly acting on the valve stem (3) is less than the thrust acting on the valve sleeve (2).

2. The automatic filling device for a bactericide according to claim 1, characterized in that, The nozzle (5) has a first stepped portion (12), the valve sleeve (2) has a second stepped portion (13), the thrust assembly includes a first return spring (14), the first return spring (14) is filled in the main tube (4), its bottom end is elastically supported downward on the first stepped portion (12), and its top end is elastically supported upward on the second stepped portion (13), the valve stem (3) includes a thin rod portion (15) and a damping portion (16), the thin rod portion (15) passes through the solid seat (7). Entering the lower cavity (9), the damping part (16) is connected to the top of the thin rod part (15) and fits on the cavity wall of the upper cavity (8). The thrust assembly also includes a second return spring (17). The thin rod part (15) is surrounded by a second return spring (17). The upper and lower ends of the second return spring (17) are elastically supported between the damping part (16) and the solid seat (7). The supporting force of the second return spring (17) is less than the supporting force of the first return spring (14).

3. The automatic filling device for a bactericide according to claim 2, characterized in that, The nozzle (5) is a pointed tip that tapers downwards, and the bottom end of the core tube (6) is tightly inserted into the nozzle (5).

4. The automatic filling device for a bactericide according to claim 3, characterized in that, The outer end of the first channel (10) is inclined upward through the solid seat (7) and through the tube wall of the core tube (6), and the inner end is inclined downward through the lower tube cavity (9). The outer end of the second channel (11) is inclined downward through the first channel (10), and the inner end is inclined upward through the upper tube cavity (8).

5. The automatic filling device for a bactericide according to claim 4, characterized in that, The first channel (10) is a ring array at three locations on the core tube (6), and the second channel (11) is a ring array at three locations on the core tube (6). Each location of the first channel (10) corresponds to a second channel (11) that is connected to it.

6. The automatic filling device for a bactericide according to claim 5, characterized in that, The top of the main tube (4) is provided with a flange connection (18).

7. The automatic filling device for a bactericide according to claim 6, characterized in that, Under the pushing action of the first return spring (14), the top of the valve sleeve (2) rises to be flush with the top surface of the flange connection (18), and the damping part (16) of the valve stem (3) rises to be flush with the top surface of the flange connection (18) under the pushing action of the second return spring (17).

8. The automatic filling device for a bactericide according to claim 7, characterized in that, The bottom periphery of the main tube (4) is connected to a connecting ring (19), and the bottom of the connecting ring (19) is provided with an annular groove (20).

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