Valve with liquid return structure

Abstract

The application relates to a valve with a liquid return structure and belongs to the technical field of valves. The valve comprises a liquid return pipe, a pipe body extending along the axial direction of the liquid return pipe, a first opening provided at a distal end of the pipe body for inserting a liquid-carrying container, a second opening provided at a proximal end of the pipe body and detachably coupled to a negative pressure generating device through a connecting interface, an axial adjusting mechanism sleeved on the outer periphery of the liquid return pipe and in sliding fit with the pipe body, and an annular abutting piece and an elastic element. The axial adjusting mechanism ensures that the insertion depths of all the liquid return pipes are equal, the insertion lengths of the liquid return pipes can be kept consistent regardless of the change of the bottle opening height, and the generation of liquid level difference is prevented.

Description

Technical Field

[0001] This invention belongs to the field of valve technology and relates to the technology of achieving equal liquid level filling control, specifically to a valve with a return liquid structure. Background Technology

[0002] In automated liquid filling systems, valve technology and precise filling control are crucial for ensuring product quality and production efficiency. Valves not only regulate and control liquid flow but also perform important functions such as sealing, precise metering, and fluid switching. Filling systems typically employ high-precision mechanical structures and control technologies to achieve a tight fit between the filling head and the return pipe, ensuring accurate liquid injection and liquid balance within the container.

[0003] In existing technologies, the return pipe is typically integrated with the filling head, enabling liquid return after the filling head is inserted into the bottle. However, due to height variations in the filling platform, especially when the bottles are tall, this integrated design may cause the filling head to exert excessive mechanical force on the bottle due to insertion position deviations, leading to bottle breakage and severely impacting production efficiency and equipment safety. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, the present invention provides a valve with a return fluid structure.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A valve with a return fluid structure is provided, comprising a valve body, and further comprising:

[0007] A return pipe is disposed within the valve body, and the pipe extending along its axial direction is provided with a distal end and a proximal end;

[0008] The distal end is provided with a first opening for inserting a liquid-carrying container;

[0009] The proximal end is provided with a second opening that can be detachably coupled to the negative pressure generating device via a connection interface;

[0010] An axial adjustment mechanism, the axial adjustment mechanism comprising an annular abutment and an elastic element;

[0011] The annular abutment is coaxially sleeved on the outer surface of the distal end of the return pipe and configured to abut against the mouth of the liquid carrying container to fix the insertion depth of the return pipe.

[0012] The elastic element is coaxially sleeved on the outer surface of the return pipe and located on the proximal side of the annular abutment, and is configured to cause the return pipe to undergo axial displacement when subjected to axial force.

[0013] Preferably, the axial adjustment mechanism further includes:

[0014] An annular abutment is coaxially sleeved on the outer periphery of the return pipe;

[0015] The bottom of the annular abutment is provided with a radially outwardly extending pressure-bearing flange, and the lower surface of the pressure-bearing flange is configured to form a surface contact seal with the bottle mouth plane of the liquid carrying container.

[0016] Preferably, the axial adjustment mechanism further includes:

[0017] An adjustable limiting component is configured to cause the pressure flange of the annular abutment to be pre-positioned relative to the first opening along its axial direction.

[0018] Preferably, the adjustable limiting component includes:

[0019] The external thread section is arranged along the axial direction on the outer surface of the return pipe, and the internal thread section is arranged on the inner wall of the annular abutment.

[0020] Preferably, the distal end of the inner wall of the return pipe is provided with a turbulence generating structure;

[0021] The turbulence generating structure includes multiple convex units arranged at intervals along the axial direction. The cross-section of each convex unit is semi-circular and continuously distributed circumferentially. The axial spacing between adjacent convex units is 1.5 to 2 times the convex height.

[0022] Preferably, the axial adjustment mechanism further includes:

[0023] The mounting sleeve is coaxially fitted onto the outer periphery of the return pipe.

[0024] A helical spring, as the elastic element, is coaxially disposed between the mounting sleeve and the return pipe;

[0025] The first end of the helical spring is fixed to the mounting sleeve, and the second end is snapped into the outer wall of the return pipe. The helical spring is kept in a pre-tightened state in the free state.

[0026] Preferably, it includes:

[0027] The elastic preload adjustment assembly includes:

[0028] Adjust the threaded sleeve to form a threaded engagement with the mounting sleeve;

[0029] The pre-compression of the elastic element can be adjusted by rotating the adjusting threaded sleeve.

[0030] Preferably, the radial constraint assembly is disposed between the mounting sleeve and the return pipe;

[0031] The radial constraint component is configured to apply a constraint force to the return pipe along the radial direction of the mounting sleeve.

[0032] Preferably, the radial constraint assembly is composed of mutually cooperating constraint grooves and constraint protrusions;

[0033] The constraint groove extends axially along the mounting sleeve and is disposed on its peripheral wall to form a linear guide track;

[0034] The constraint protrusion is fixedly set on the outer peripheral surface of the return pipe, and its protruding end is embedded in the constraint groove and maintains the sliding freedom along the length of the groove.

[0035] The interface between the constraint groove and the constraint protrusion forms a radial limiting surface, allowing the constraint force to be transmitted to the radial outer surface of the return pipe through interface contact.

[0036] Preferably, the valve body has an inlet pipe and an outlet pipe;

[0037] The return pipe is inserted into the outlet pipe.

[0038] This invention provides a valve with a return structure, and the beneficial effects of this invention are as follows:

[0039] The ring-shaped abutment against the bottle neck ensures that all return pipes are inserted to the same depth. Regardless of changes in bottle neck height, the insertion length of the return pipe remains consistent, preventing liquid level differences.

[0040] By incorporating an elastic element, the return pipe can flexibly adjust its height while maintaining a constant insertion length when subjected to axial resistance from the bottle opening against the annular contact piece. This effectively alleviates the problem of rigid connection with taller bottles, reduces the risk of bottle breakage, and improves the overall safety and production efficiency of the filling system. Attached Figure Description

[0041] Figure 1 This is one of the perspective views of the valve with a return liquid structure proposed in this invention;

[0042] Figure 2 This is a second perspective view of the valve with a return liquid structure proposed in this invention;

[0043] Figure 3 for Figure 1 The front view of the structure shown;

[0044] Figure 4 for Figure 1 Side view of the structure shown;

[0045] Figure 5 for Figure 1 A cross-sectional view of the structure shown;

[0046] Figure 6 This is the third perspective view (hidden mounting sleeve) of the valve with a return structure proposed in this invention.

[0047] Figure 7 for Figure 6 The front view of the structure shown;

[0048] Figure 8 for Figure 6 A cross-sectional view of the structure shown;

[0049] Figure 9 for Figure 6 Side view of the structure shown.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Return pipe; 101. Second opening; 102. First opening; 201. Elastic element; 202. Annular abutment; 2021. Pressure bearing flange; 3. Adjustable limiting assembly; 4. Mounting sleeve; 5. Elastic preload adjustment assembly; 6. Inlet pipe; 7. Outlet. Detailed Implementation

[0052] The technical solutions of the embodiments 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Please see Figures 1-9 As shown, the specific embodiments provided by the present invention are as follows:

[0054] like Figures 1 to 2 As shown, an embodiment of the present invention proposes a valve with a return liquid structure, applicable to valves, particularly filling valves, to achieve precise filling liquid level control. The valve with the return liquid structure includes a return liquid pipe 1, the distal end of which (i.e., the end furthest from the valve) has a second opening 101. This second opening 101 can be connected to a negative pressure generating device (such as a vacuum pump) to create a negative pressure inside the return liquid pipe 1, thereby drawing filling liquid above a set liquid level. The proximal end of the return liquid pipe 1 (i.e., the end near the valve) has a first opening 102 for drawing liquid from the filling bottle above a set liquid level.

[0055] During the filling process, if the liquid level in a certain filling bottle is higher than the height of the first opening 102, the liquid will be drawn into the return pipe 1 by the first opening 102 or discharged through the second opening 101, thereby controlling the consistency of the filling liquid level.

[0056] To further optimize the valve with the return liquid structure, this invention also adds an axial adjustment mechanism. Since each valve corresponds to one filling bottle, and each return liquid pipe 1 also corresponds to one filling bottle, in the prior art, multiple filling heads need to be uniformly installed on the same lifting device. That is, the descending height of the multiple filling heads is fixed and equal, meaning the descending stroke of the return liquid pipe is also fixed and equal.

[0057] Therefore, on the one hand, when the height of a certain local area of ​​the filling platform is relatively high, the height of the filling bottles placed in that local area will increase. When the filling head corresponding to the filling bottle descends, it is very easy to cause the filling bottle and the filling head to make a hard contact, thereby causing damage to the filling bottle.

[0058] On the other hand, when the volume of a certain filling bottle deviates, especially when the volume is smaller than that of the other filling bottles, or when the filling platform at the bottom of the filling bottle is uneven, causing the filling bottle to be at a different height than the other filling bottles, the axial adjustment mechanism is used to adjust the return pipe 1 of the valve corresponding to the filling bottle axially, so that the length of the return pipe 1 inserted into the filling bottle is consistent with that of the return pipe 1 inserted into the other filling bottles.

[0059] Specifically, the axial adjustment mechanism includes an elastic element 201 and an annular abutment 202. The annular abutment 202 is used to abut against the bottle neck. It should be noted that the length of the return port of the return pipe 1 from the annular abutment 202 is the same. Therefore, when the annular abutment 202 abuts against the bottle neck, it indicates that the length of the return pipe 1 corresponding to the valve inserted into the bottle is fixed and equal. That is to say, the insertion length of the return pipe 1 in multiple bottles is equal, and each return pipe 1 draws liquid above the set liquid level at the same height. If a bottle has a smaller volume, when filling the same amount of liquid, the actual liquid level of that bottle will be higher than the actual liquid level of the other bottles, resulting in non-equal liquid level filling. Therefore, since the insertion length of the return pipe 1 is equal, it can be ensured that liquid is drawn at the same height, achieving equal liquid level filling of multiple bottles.

[0060] Alternatively, if the bottom platform of a bottle is uneven, such as when the bottle is supported to a relatively high height, in one case, the return pipe 1 (referring to the return pipe 1 without the annular abutment 202 and the elastic element 201) in the prior art will be driven into the bottle by the lifting device (referring to the device that drives the valve to descend towards the bottle). However, since the bottle is significantly raised, the insertion length of the return pipe 1 corresponding to this bottle will be significantly increased compared to the return pipe 1 of other bottles. Therefore, when extracting liquid, it will be found that the liquid level in this bottle will be significantly lower, creating a height difference with the liquid levels of other bottles. Based on this, in addition to adding the annular abutment 202, an elastic element 201 is further added. The elastic element 201 allows the return pipe 1 to move axially. Specifically, when the annular abutment 202 abuts against the bottle neck, it pushes the elastic element 201 to compress, thereby causing the return pipe 1 to rise relative to the valve. The purpose of this is to prevent the return pipe 1 from continuing to descend, which could result in excessively low liquid extraction. In other words, when the annular contact 202 abuts against the bottle neck, it indicates that the insertion length of each return pipe 1 is equal. Then, the elastic element 201 drives the return pipe 1 to rise, so as to adaptively adjust the height of the return pipe 1 without changing the insertion length of the return pipe 1, thereby achieving equal liquid level filling for different working conditions.

[0061] In another scenario, when the return pipe 1 in the prior art (which has an annular abutment 202 but no elastic element 201) descends, it will forcefully contact the taller filling bottle, causing damage to the bottle. Therefore, when the return pipe 1 is subjected to an axial force (i.e., the resistance exerted by the bottle mouth on the annular abutment 202), the elastic element 201 enables the return pipe 1 to have axial displacement function. That is, while maintaining its insertion length, it adaptively adjusts its height, thereby avoiding applying excessively strong force to the filling bottle and effectively protecting it.

[0062] refer to Figure 3 and Figure 4 As shown, the axial adjustment mechanism further includes an annular abutment 202, which is coaxially sleeved on the outer periphery of the return pipe 1 to achieve a sealed contact with the mouth of the liquid carrying container (such as a filling bottle) and ensure the accuracy of liquid level control.

[0063] The annular abutment 202 not only serves as a support for the return pipe 1, but also seals the mouth of the liquid-carrying container during the filling process, ensuring consistent liquid level and accurate liquid backflow.

[0064] Specifically, the bottom of the annular abutment 202 is provided with a radially outwardly extending pressure-bearing flange 2021, which is used to increase the contact area with the mouth of the liquid-carrying container and improve the sealing performance. The lower surface of the pressure-bearing flange 2021 forms a surface contact seal with the surface of the mouth of the liquid-carrying container.

[0065] The function of the pressure-bearing flange 2021 is to ensure a reliable seal between the return pipe 1 and the bottle neck during the filling process, preventing liquid from leaking out or entering the external area of ​​the bottle neck during the backflow process. This not only ensures the accuracy of liquid return but also improves the operational stability during the filling process and avoids liquid level fluctuations.

[0066] When the return pipe 1 is inserted into the liquid-carrying container (such as a filling bottle), the pressure-bearing flange 2021 of the annular abutment 202 contacts the surface of the bottle opening through a radially outward structure. Since the contact between the lower surface of the pressure-bearing flange 2021 and the surface of the bottle opening is a surface contact seal, an effective sealing structure can be formed to prevent liquid from leaking out of the return pipe 1 or flowing back into the bottle.

[0067] The sealing effect is achieved based on the compatibility of the material of the pressure-bearing flange 2021 with the return pipe 1 and the bottle opening. The lower surface of the pressure-bearing flange 2021 is usually made of a softer material with a certain degree of flexibility, which can fit tightly against the bottle opening when slight pressure is applied, thereby forming a sealing effect.

[0068] On the other hand, the installation positions of the annular abutment 202 of each return pipe 1 are consistent. That is to say, the insertion depth of each return pipe 1 is consistent.

[0069] refer to Figure 5 As shown, the axial adjustment mechanism further includes an adjustable limiting component 3. The introduction of the adjustable limiting component 3 enables the pressure-bearing flange 2021 of the annular abutment 202 to be pre-positioned relative to the first opening 102 in the axial direction. By setting the adjustable limiting component 3, the insertion depth of the return pipe 1 can be precisely controlled, ensuring more accurate and consistent liquid level control.

[0070] Specifically, the main function of the adjustable limiting component 3 is to adjust the position of the pressure-bearing flange 2021 of the annular abutment 202, so that it can be precisely adjusted in the axial direction. Through this adjustment, the pressure-bearing flange 2021 of the annular abutment 202 can adapt to different bottle opening heights, thereby ensuring the depth of the return pipe 1 when inserted into the bottle opening and the accuracy of liquid level control.

[0071] The adjustable limit component 3 allows the user to adjust the insertion depth of the return pipe 1 according to actual needs, thereby adjusting the control accuracy of the filling liquid level. This adjustment is typically achieved by rotating the return pipe 1 or the annular abutment 202.

[0072] The adjustable limit component 3 consists of two mating threaded sections:

[0073] The external thread section is arranged axially along the outer surface of the return pipe 1. Its function is to provide a fit with the internal thread section, thereby enabling adjustment between the return pipe 1 and the annular abutment 202. During adjustment, the external thread section allows for fine-tuning of the return pipe 1 in the axial direction, controlling the insertion depth of the return pipe 1.

[0074] The internal thread section is located on the inner wall of the annular abutment 202 and engages with the external thread section of the return pipe 1. By rotating the return pipe 1, the engagement of the external thread section and the internal thread section causes the return pipe 1 and the annular abutment 202 to move relative to each other, thereby adjusting the insertion depth of the return pipe 1.

[0075] The engagement between these two threaded sections provides a precise adjustment method, ensuring that the pressure-bearing flange 2021 of the annular abutment 202 is precisely pre-positioned relative to the first opening 102 of the return pipe 1 in the axial direction. By rotating the external threaded section, the user can precisely control the contact depth of the pressure-bearing flange 2021 of the annular abutment 202 relative to the bottle neck.

[0076] Specifically, when the user needs to adjust the liquid level, the external thread section of the return pipe 1 can be rotated. This rotation causes a change in the relative position between the return pipe 1 and the annular abutment 202, thereby adjusting the contact depth of the pressure-bearing flange 2021 of the annular abutment 202 relative to the bottle neck.

[0077] A turbulence generating structure (not shown in the figure) is provided at the far end of the inner wall of the return pipe 1. This structure, through multiple axially spaced protrusions, can effectively change the liquid flow state, promote rapid liquid return, and improve the accuracy of filling level control.

[0078] Specifically, the turbulence-generating structure located at the distal end of the inner wall of the return pipe 1 consists of multiple axially spaced protruding units (not shown in the figure). The main function of this structure is to disrupt the laminar flow of the liquid by agitating its flow, thereby promoting turbulent flow. This increases the liquid's flow velocity, enhances the return effect, and reduces the residence time of the liquid during the return process, thus optimizing liquid level control during filling.

[0079] Each raised unit has a semi-circular cross-section (not shown in the figure), which ensures that the liquid makes smooth contact with the raised unit during the flow, thereby forming uniform turbulence during the flow.

[0080] Multiple raised units are arranged at intervals along the axial direction of the return pipe 1, and their continuous circumferential distribution ensures that the liquid is always in a turbulent state throughout the entire return process, preventing poor liquid flow or stagnation in local areas. The continuous circumferential distribution can more uniformly promote turbulent flow of the liquid, improving the efficiency and consistency of the return process.

[0081] In addition, the axial spacing between adjacent raised units is set to 1.5 to 2 times the height of the raised unit. This generates sufficient disturbance while avoiding excessive flow resistance caused by excessive overlap. The appropriate spacing ensures stable turbulence as the liquid passes through each raised unit, avoiding excessively slow liquid flow due to excessive spacing or excessively turbulent liquid flow due to excessively small spacing.

[0082] refer to Figure 1 As shown, the axial adjustment mechanism includes a mounting sleeve 4, which is coaxially sleeved on the outer circumference of the return pipe 1. The function of the mounting sleeve 4 is to provide a stable support structure, allowing the return pipe 1 to move axially. The fit between the mounting sleeve 4 and the return pipe 1 ensures that the return pipe 1 can move smoothly when adjustment is needed, while also preventing the return pipe 1 from swaying laterally.

[0083] A helical spring, acting as an elastic element 201, is coaxially positioned between the mounting sleeve 4 and the return pipe 1, providing crucial elastic support. Its main function is to provide a predetermined restoring force when the return pipe 1 moves axially, ensuring that it returns to its initial set position after being subjected to external forces and adapts to changes in axial displacement. It should be noted that the axial displacement of the return pipe 1 only affects its height and does not alter its insertion depth into the filling bottle.

[0084] Specifically, the first end of the helical spring is fixed to the mounting sleeve 4 to ensure the spring's position is stable and not easily dislodged. The second end is snapped into the outer wall of the return pipe 1, forming a tight fit with the return pipe 1. When the return pipe 1 needs to move axially, the second end of the spring moves together with the return pipe 1.

[0085] In its free state, i.e., when no external force is applied, the helical spring remains in a pre-tensioned state, which means that the helical spring is compressed and in an initial state of being under force. This pre-tensioned state gives the spring a certain elastic force, which can provide a reverse thrust when the return pipe 1 is inserted into the bottle opening or contacts the bottle wall, so as to ensure that the contact between the annular abutment 202 and the bottle opening is always consistent.

[0086] When the return pipe 1 is inserted into the filling bottle, if the bottom of the bottle is uneven or the volume is different, the return pipe 1 will adjust axially according to the position of the bottle opening. The preload of the helical spring allows the return pipe 1 to automatically adjust according to the height change of the bottle opening, that is, while ensuring that the insertion depth of the return pipe 1 is consistent, the height of the return pipe 1 is adjusted so as not to be affected by the volume or unevenness of the filling platform.

[0087] refer to Figure 7 and Figure 8 As shown, it includes an elastic preload adjustment assembly 5 for adjusting the preload of the elastic element 201 (such as a helical spring).

[0088] The adjustment assembly includes an adjusting threaded sleeve that threads with the mounting sleeve 4. The compression of the elastic element 201 is changed by rotating the adjusting threaded sleeve. The compression of the spring directly affects the restoring force it provides. Adjusting the spring compression effectively adjusts the force required for the return pipe 1 to return to its initial position after being subjected to an external force. Reducing the spring compression decreases the restoring force, making the return pipe 1 easier to move; increasing the compression enhances the restoring force, making the return pipe 1 more difficult to move axially, thus improving the stability of the return pipe 1.

[0089] Different bottle types or working environments require varying degrees of restoring force to ensure the proper functioning of the return tube 1. By adjusting the spring compression, the adaptability of the return tube 1 can be fine-tuned according to actual needs. For example, irregularly shaped bottles may require a larger restoring force to ensure the return tube 1 can adapt to changes in the bottle neck; while regular bottle shapes may require a smaller restoring force for more flexible adjustments. On the other hand, it is crucial to ensure that the return tube 1 maintains a consistent contact pressure with the bottle neck. This is essential for filling accuracy and preventing damage to the bottle neck. If the spring compression is too small, the restoring force will be weak, potentially causing the return tube 1 to fail to fully contact the bottle neck; conversely, if the spring compression is too large, it may lead to excessive contact, putting pressure on the bottle neck and affecting product quality.

[0090] As shown in the figure, a radial constraint component (not shown) is provided between the mounting sleeve 4 and the return pipe 1 to ensure that the return pipe 1 remains stable during axial adjustment and to avoid radial deviation.

[0091] In this embodiment, the main function of the radial constraint component is to prevent radial deviation of the return pipe 1 during operation. If the return pipe 1 deviates radially, the position of the first opening 102 of the return pipe 1 will also shift accordingly, which directly affects the liquid level in the filling bottle, thus making it impossible to achieve precise equal-level filling during the filling process. Specifically, if the radial deviation of the return pipe 1 is too large, the alignment of the first opening 102 with the bottle mouth will be inaccurate, resulting in uneven liquid filling and making it impossible to ensure that the liquid level of each bottle is consistent.

[0092] The radial constraint assembly applies an appropriate constraint force along the outer wall of the return pipe 1 to ensure that the return pipe 1 does not deviate radially while moving axially. This constraint force keeps the return pipe 1 stably aligned, avoiding inconsistent liquid levels caused by inaccurate positioning of the return pipe 1, thereby ensuring accuracy and stability during the filling process.

[0093] In addition, the radial constraint assembly works together with the elastic element 201 (such as a helical spring) to ensure that the return pipe 1 always maintains the correct connection with the bottle opening under different operating conditions.

[0094] In one specific embodiment, the radial constraint assembly consists of mutually cooperating constraint grooves and constraint protrusions (not shown in the figure) to precisely control the radial displacement of the return pipe 1, ensuring that the return pipe 1 remains stable during adjustment and avoiding the impact of radial deviation on filling accuracy.

[0095] Specifically, the constraint groove extends axially along the mounting sleeve 4 and is disposed on its peripheral wall, forming a linear guide track (not shown in the figure). This guide track ensures that the return pipe 1 is always precisely radially constrained when it is axially adjusted inside the mounting sleeve 4. The length and shape of the constraint groove can be optimized according to the size of the return pipe 1 and the required adjustment range to ensure that the return pipe 1 can move freely during operation while effectively avoiding radial offset.

[0096] A constraint protrusion (not shown in the figure) is fixedly mounted on the outer circumferential surface of the return pipe 1, with its protruding end embedded in the constraint groove, maintaining sliding freedom along the length of the groove. The cooperation between the constraint protrusion and the constraint groove ensures that the return pipe 1 maintains correct radial positioning during axial adjustment, preventing radial displacement of the return pipe 1 due to vibration or external forces. The interface between the protrusion and the groove forms a radial limiting surface, allowing the constraint force to be transmitted to the outer diameter surface of the return pipe 1 through this interface.

[0097] In actual operation, when the return pipe 1 moves axially, the constraint protrusion slides within the constraint groove, preventing radial deviation of the return pipe 1. This fit not only ensures the stability of the return pipe 1 during adjustment but also effectively prevents the position of the first opening 102 of the return pipe 1 from shifting. If the return pipe 1 experiences radial deviation, the position of the first opening 102 may become misaligned relative to the bottle neck, resulting in inconsistent liquid levels during filling and preventing equal-level filling. This radial constraint component effectively avoids this problem and ensures consistent liquid levels.

[0098] Through the cooperation of the constraint groove and the constraint protrusion, the radial constraint assembly can provide strong radial support, making the return pipe 1 stable and reliable during axial adjustment, and avoiding the liquid level error problem caused by radial deviation.

[0099] This invention provides a valve, specifically a filling valve, such as a filling head. (See reference) Figures 1 to 9 As shown, the filling head is equipped with a valve with a return structure as mentioned in the above embodiments, which is designed to achieve precise liquid level control and ensure the uniformity and consistency of liquid flow during the filling process.

[0100] The valve body includes a valve stem and a valve sleeve. The valve stem is slidably connected to the valve sleeve. The valve stem has a hollow tubular structure, and the return pipe 1 is coaxially arranged inside the valve stem and fixedly connected to the valve stem.

[0101] The elastic element 201 can be sleeved on the axial wall of the valve stem, for example, one end is connected to the valve stem and the other end is connected to the valve sleeve, and the annular abutment 202 is sleeved on the axial wall of the valve stem. At this time, the annular abutment 202 drives the valve stem and the return pipe 1 to rise synchronously. Correspondingly, the elastic element 201 is adapted to provide elastic force.

[0102] A liquid inlet pipe 6 is provided on one side of the valve body, connecting the interior of the valve body to the gap between the return pipe 1 and the interior of the valve body. This liquid inlet pipe 6 allows liquid to enter the valve body from a storage tank or other liquid source, and then flow out through the gap into the return pipe 1, thus realizing the flow and control of the liquid. A liquid outlet 7 is provided on the side wall at the bottom of the valve body, through which the liquid flows out of the valve, realizing the filling function.

[0103] In this embodiment, the first opening 102 of the return pipe 1 is located at the center of the bottom of the valve body. This opening is the key part where liquid flows out of the return pipe 1 and into the filling bottle. The first opening 102 of the return pipe 1 is designed with the bottle mouth shape and filling liquid level requirements in mind to ensure that the liquid can be injected into the bottle accurately and evenly.

[0104] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inner", "outer", "inner side", "outer side", etc. indicate the orientation or positional relationship.

[0105] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0106] In the description of embodiments of the present invention, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0107] In the description of the embodiments of the present invention, it should be understood that "-" and "~" represent a range between two numerical values, and this range includes the endpoints. For example, "AB" represents a range greater than or equal to A and less than or equal to B. "A~B" represents a range greater than or equal to A and less than or equal to B.

[0108] In the description of embodiments of the present invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0109] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve with a return structure, comprising a valve body, characterized in that, Also includes: A return pipe is disposed within the valve body, and the pipe extending along its axial direction is provided with a distal end and a proximal end; The distal end is provided with a first opening for inserting a liquid-carrying container; The proximal end is provided with a second opening that can be detachably coupled to the negative pressure generating device via a connection interface; An axial adjustment mechanism, the axial adjustment mechanism comprising an annular abutment and an elastic element; The annular abutment is coaxially sleeved on the outer surface of the distal end of the return pipe and configured to abut against the mouth of the liquid carrying container to fix the insertion depth of the return pipe. The elastic element is coaxially sleeved on the outer surface of the return pipe and located on the proximal side of the annular abutment, and is configured to cause the return pipe to undergo axial displacement when subjected to axial force. The valve body includes a valve stem, which is a hollow tubular structure. The return pipe is coaxially disposed inside the valve stem and is fixedly connected to the valve stem. The valve body has an inlet pipe on one side of the valve stem, which connects the gap between the inside of the valve body and the return pipe.

2. The valve with a return structure according to claim 1, characterized in that, The bottom of the annular abutment is provided with a radially outwardly extending pressure-bearing flange, and the lower surface of the pressure-bearing flange is configured to form a surface contact seal with the bottle mouth plane of the liquid carrying container.

3. The valve with a return structure according to claim 2, characterized in that, The axial adjustment mechanism further includes: An adjustable limiting component is configured to cause the pressure flange of the annular abutment to be pre-positioned relative to the first opening along its axial direction.

4. The valve with a return structure according to claim 3, characterized in that, The adjustable limiting component includes: The external thread section is arranged along the axial direction on the outer surface of the return pipe, and the internal thread section is arranged on the inner wall of the annular abutment.

5. The valve with a return structure according to any one of claims 1 to 4, characterized in that, The distal end of the inner wall of the return pipe is provided with a turbulence generating structure; The turbulence generating structure includes multiple convex units arranged at intervals along the axial direction, each of which has a semi-circular cross-section and is continuously distributed circumferentially.

6. The valve with a return structure according to any one of claims 1 to 4, characterized in that, The axial adjustment mechanism further includes: The mounting sleeve is coaxially fitted onto the outer periphery of the return pipe. A helical spring, as the elastic element, is coaxially disposed between the mounting sleeve and the return pipe; The first end of the helical spring is fixed to the mounting sleeve, and the second end is snapped into the outer wall of the return pipe. The helical spring is kept in a pre-tightened state in the free state.

7. The valve with a return structure according to claim 6, characterized in that, include: The elastic preload adjustment assembly includes: Adjust the threaded sleeve to form a threaded engagement with the mounting sleeve; The pre-compression of the elastic element can be adjusted by rotating the adjusting threaded sleeve.

8. The valve with a return structure according to claim 6, characterized in that, include: A radial constraint assembly is disposed between the mounting sleeve and the return pipe; The radial constraint component is configured to apply a constraint force to the return pipe along the radial direction of the mounting sleeve.

9. The valve with a return structure according to claim 8, characterized in that, The radial constraint assembly consists of mutually cooperating constraint grooves and constraint protrusions; The constraint groove extends axially along the mounting sleeve and is disposed on its peripheral wall to form a linear guide track; The constraint protrusion is fixedly set on the outer peripheral surface of the return pipe, and its protruding end is embedded in the constraint groove and maintains the sliding freedom along the length of the groove. The interface between the constraint groove and the constraint protrusion forms a radial limiting surface, allowing the constraint force to be transmitted to the radial outer surface of the return pipe through interface contact.

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