A dosing valve

Abstract

The utility model relates to a kind of quantitative valves. Including valve body, valve rod and closure cap;Valve body is the structure of upper and lower through-penetration, and filling chamber is equipped in valve body;Buffer cavity of upper and lower through-penetration is equipped in valve rod, and spout hole that is connected with buffer cavity is equipped on the outer side wall of valve rod, and valve rod is inserted into filling chamber from top to bottom, and valve rod is cooperated in the upper end opening of valve body and blocks spout hole;Closure cap is detachably connected in the lower end opening of valve body, and the upper end surface of closure cap is equipped with buffer column that is cooperated with buffer cavity, and spout hole is inserted into filling chamber in the process that valve rod moves downwards, and a plurality of through holes are equipped on closure cap.The utility model is equipped with buffer cavity of upper and lower through-penetration in valve rod, and the buffer column of bottom is inserted into buffer cavity to assist gas-liquid extrusion in single pressing, and buffer column can be reversely retracted to suck back residual liquid when retracting in rebound.

Description

Technical Field

[0001] This utility model belongs to the field of metering valve technology, and specifically relates to a metering valve. Background Technology

[0002] Metering valves are widely used in sprays, aerosols, and spray bottles. Their function is to pump compressed gas or liquid out of the can by pressing down on the valve stem. To achieve single-press single-dispense, a metering valve is installed at the connection point, so that each press will only dispense a fixed amount of aerosol or liquid, achieving metered use. However, metering valves on the market can only provide metered dispensing. After dispensing, the liquid on the nozzle will hang on the nozzle due to insufficient subsequent spraying force, causing dripping or splashing when spraying again. This can result in the user's hands getting wet, poor spraying effect, and even corrosive aerosols causing hand injury. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a metering valve, which has a buffer chamber that runs through the valve stem from top to bottom. When pressed once, the bottom buffer column extends into the buffer chamber to assist in the extrusion of gas and liquid. When the valve rebounds, the retracting buffer column can reverse the flow of residual liquid and draw it back.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A metering valve includes a valve body, a valve stem, a sealing cap, and a spring;

[0006] The valve body has a through-hole structure, and a filling chamber is provided inside the valve body. The filling chamber is surrounded by an internal gasket and a lip gasket.

[0007] The valve stem has a buffer chamber that extends vertically through it. A spray hole communicating with the buffer chamber is located on the outer wall of the valve stem. The valve stem passes through the filling chamber from top to bottom. The valve stem fits into the upper opening of the valve body and seals the spray hole. The valve stem has a rod-shaped structure that is wider at the top and narrower at the bottom. The spray hole is located at the upper end of the valve stem and abuts against an internal washer. The lip washer abuts against the gradually changing section in the middle of the valve stem. A limiting post is located on the outer wall of the lower end of the valve stem. A spring is fitted onto the lower end of the valve stem, and the upper and lower ends of the spring abut against the limiting post and the sealing cap, respectively.

[0008] The sealing cover is detachably connected to the lower opening of the valve body. The upper surface of the sealing cover is provided with a buffer column that cooperates with the buffer chamber. During the downward movement of the valve stem, the spray hole extends into the filling chamber. The sealing cover is provided with several through holes.

[0009] The buffer chamber consists of two parts: a discharge chamber (larger at the top and smaller at the bottom) and a mating chamber. The spray nozzle communicates with the discharge chamber. During the downward movement of the valve stem, the upper end of the buffer column extends into the discharge chamber through the mating chamber. The valve stem consists of an upper rod, a lower rod, and a sealing ring. The discharge chamber is located inside the upper rod, and the mating chamber is located inside the lower rod. The upper rod is detachably connected to the lower rod. The sealing ring is located at the connection between the upper and lower rods, and the upper end of the buffer column fits into the sealing ring.

[0010] In this metering valve, a filling chamber is formed within the valve body by an internal gasket and a lip gasket to store a fixed amount of liquid. The internal closed space formed by the valve stem passing through the internal gasket, filling chamber, and lip gasket from top to bottom is the metering storage chamber for each spray. After the actuator is installed on the top of the valve stem from top to bottom, external force is applied to press down, causing the nozzle at the top of the valve stem to pass over the seal of the internal gasket and enter the filling chamber, sending the stored liquid into the actuator and spraying it outward. After the external force is released, the valve stem is pushed upward by the spring, causing the nozzle to re-abut against the internal gasket for sealing. The filling chamber is then replenished with sufficient storage liquid for the next use. How the storage liquid is replenished and how it is sprayed outward is existing technology for metering valves, so its implementation will not be elaborated further here.

[0011] During normal downward spraying operation, when the actuator loses downward pressure, the valve stem moves upward under the force of the spring. There is no subsequent replenishment of the stored fluid at the nozzle. However, residual fluid from the previous operation remains at the upper end of the buffer chamber. As the valve stem moves upward, it is pushed out of the actuator by inertia, causing the residual fluid to overflow. To solve this problem, the buffer chamber, which originally opened from top to bottom to the nozzle, is now extended downwards through the lower end of the valve stem, forming a continuous buffer chamber structure. The nozzle is located on the upper outer wall of the valve stem. A detachable sealing cap is attached to the lower opening of the valve body. The sealing cap has several through holes for subsequent replenishment of the storage liquid. The lower end of the sealing cap can be provided with a downward-extending tubular limiting plate to accommodate the immersion tube, allowing direct pumping of the storage liquid from the bottom of the tank. The buffer column on the upper end of the sealing cap extends from bottom to top into the buffer cavity during the assembly of the sealing cap. To ensure that the sealing cap can be fixed at the lower opening of the valve body, it can be screwed into the lower opening of the valve body through a threaded connection of external and internal threads to achieve a fixed connection.

[0012] After assembly, pressing the valve stem downwards causes the upper end of the buffer column to extend upwards past the nozzle, assisting in pushing the stored liquid upwards. When the valve stem is pushed upwards by the spring, the buffer column moves downwards, creating space at the top of the buffer chamber. This allows the stored liquid inside to retract and be drawn back in, preventing dripping. However, if the diameter of the buffer chamber is the same as the buffer column, it could block the nozzle during the upward extension of the buffer column, causing the stored liquid in the filling chamber to spray out unevenly. Therefore, the buffer chamber is divided into upper and lower parts. The diameter of the upper discharge chamber is larger than that of the lower matching chamber, ensuring that the nozzle in the discharge chamber is not blocked by the extension of the buffer column and can spray out smoothly.

[0013] However, if the buffer chamber that runs through the top and bottom is not sealed in the middle, the stored liquid in the discharge chamber may enter the tank along the mating chamber as the buffer column extends upwards. Alternatively, if the tank is under high pressure, the stored liquid in the tank may enter the discharge chamber from the mating chamber, resulting in an excessive spray volume. This would cause the metering valve to lose its original metering function. Therefore, the valve stem is set into two parts: the discharge chamber is located in the upper stem, and the mating chamber is located in the lower stem. A sealing ring is installed at the connection between the upper and lower stems, thereby achieving good separation of the stored liquid in the discharge chamber and the mating chamber during the up-and-down movement of the buffer column.

[0014] Furthermore, the lower end face of the upper rod is provided with a downwardly extending stud, the upper end face of the lower rod is provided with an inwardly recessed screw hole, the bottom of the screw hole is provided with a mounting groove, the sealing ring is embedded in the mounting groove, and the stud is screwed into the screw hole.

[0015] Compared with the prior art, the advantages of this utility model are as follows: the downward-penetrating buffer cavity allows the buffer column on the sealed cover to extend into the buffer cavity. During the up-and-down movement of the valve stem, the buffer column can assist in pushing the stored liquid outward, and can also retract the residual stored liquid during the upward movement of the valve stem to prevent it from dripping outward, thereby avoiding pollution of the external environment. Even if the stored liquid is a corrosive liquid, it can greatly prevent it from dripping and injuring people. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the present utility model;

[0018] Figure 2This is an exploded view and a half-sectional view of the valve body of this utility model;

[0019] Figure 3 This is a top view of the present invention;

[0020] Figure 4 For the present utility model Figure 3 AA section view;

[0021] Figure 5 This is a schematic diagram of the downward ejection of this utility model;

[0022] Figure 6 This is a half-sectional perspective view of the lower rod and sealing ring of this utility model.

[0023] The components are as follows: 1. Valve body; 11. Filling chamber; 12. Built-in gasket; 13. Lip gasket; 2. Valve stem; 21. Buffer chamber; 211. Discharge chamber; 212. Fitting chamber; 22. Spray hole; 23. Limiting post; 24. Upper rod; 241. Stud; 25. Lower rod; 251. Screw hole; 252. Mounting groove; 26. Sealing ring; 3. Sealing cover; 31. Buffer post; 32. Through hole; 4. Spring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] The specific embodiments of this utility model will now be described with reference to the accompanying drawings:

[0026] like Figure 1-6 As shown, a metering valve includes a valve body 1, a valve stem 2, a sealing cover 3, and a spring 4;

[0027] The valve body 1 has a through-hole structure, and a filling chamber 11 is provided inside the valve body 1. The filling chamber 11 is surrounded by an internal gasket 12 and a lip gasket 13.

[0028] The valve stem 2 has a buffer chamber 21 that runs vertically through it. The outer wall of the valve stem 2 has a spray hole 22 that communicates with the buffer chamber 21. The valve stem 2 passes through the filling chamber 11 from top to bottom. The valve stem 2 fits into the upper opening of the valve body 1 and seals the spray hole 22. The valve stem 2 has a rod-shaped structure that is larger at the top and smaller at the bottom. The spray hole 22 is located at the upper end of the valve stem 2 and abuts against the built-in washer 12. The lip washer 13 abuts against the gradual transition in size in the middle of the valve stem 2. The outer wall of the lower end of the valve stem 2 has a limiting post 23. The spring 4 is sleeved on the lower end of the valve stem 2. The upper and lower ends of the spring 4 abut against the limiting post 23 and the sealing cover 3, respectively.

[0029] The sealing cover 3 is detachably connected to the lower opening of the valve body 1. The upper surface of the sealing cover 3 is provided with a buffer column 31 that cooperates with the buffer chamber 21. During the downward movement of the valve stem 2, the spray hole 22 extends into the filling chamber 11. The sealing cover 3 is provided with several through holes 32.

[0030] The buffer chamber 21 consists of two parts: a discharge chamber 211 (larger at the top and smaller at the bottom) and a mating chamber 212. The spray nozzle 22 is connected to the discharge chamber 211. During the downward movement of the valve stem 2, the upper end of the buffer column 31 extends into the discharge chamber 211 through the mating chamber 212. The valve stem 2 consists of an upper rod 24, a lower rod 25, and a sealing ring 26. The discharge chamber 211 is located inside the upper rod 24, and the mating chamber 212 is located inside the lower rod 25. The upper rod 24 is detachably connected to the lower rod 25. The sealing ring 26 is located at the connection between the upper rod 24 and the lower rod 25, and the upper end of the buffer column 31 fits into the sealing ring 26.

[0031] Furthermore, the lower end face of the upper rod 24 is provided with a downwardly extending stud 241, the upper end face of the lower rod 25 is provided with an inwardly recessed screw hole 251, the bottom of the screw hole 251 is provided with a mounting groove 252, the sealing ring 26 is embedded in the mounting groove 252, and the stud 241 is screwed into the screw hole 251.

[0032] Description of the working principle of this utility model:

[0033] In this metering valve structure, a filling chamber 11 is formed within the valve body 1 by an internal gasket 12 and a lip gasket 13 to store a fixed amount of liquid. The internal closed space formed by the valve stem 2 passing through the internal gasket 12, the filling chamber 11, and the lip gasket 13 from top to bottom is the metering storage chamber for each spray. After the actuator is installed on the top of the valve stem 2 from top to bottom, it is pressed down by external force, causing the spray hole 22 at the upper end of the valve stem 2 to pass through the blockage of the internal gasket 12 and enter the filling chamber 11, storing the liquid stored therein. After the storage fluid is fed into the actuator, it is sprayed outwards. After the external force is removed, the valve stem 2 is pushed upwards by the spring 4, causing the nozzle 22 to re-abut against the built-in gasket 12 for sealing. Meanwhile, the filling chamber 11 is replenished with enough storage fluid for the next use. How to replenish the storage fluid and how to spray it outwards are existing technologies of metering valves. Therefore, we will not go into too much detail about how to achieve this here. The structure of this part is also simplified in the attached drawings, only retaining the structure required for the technical solution to solve the technical problem.

[0034] During normal downward spraying operation, when the actuator loses downward pressure, the valve stem 2 moves upward under the force of the spring 4. There is no subsequent replenishment of the stored liquid at the nozzle 22. However, residual liquid remains at the upper end of the buffer chamber 21 from the previous operation. As the valve stem 2 moves upward, it is pushed out of the actuator by inertia, causing the residual liquid to overflow. To solve this problem, the buffer chamber 21, which originally opened from top to bottom to the nozzle 22, is extended directly downwards to the lower end of the valve stem 2, forming a vertically penetrating buffer chamber 21 structure. The nozzle 22 is located on the upper outer wall of the valve stem 2. A detachable cover 3 is connected to the lower opening of the valve body 1. The cover 3 has several through holes 32 for subsequent upward replenishment of the storage liquid. The lower end face of the cover 3 can be provided with a downward-extending tubular limiting plate tail for mounting the immersion tube, so that the storage liquid at the bottom of the tank can be directly pumped. The buffer column 31 on the upper end face of the cover 3 extends into the buffer cavity 21 from bottom to top during the assembly of the cover 3. In order to ensure that the cover 3 can be fixed at the lower opening of the valve body 1, the cover 3 can be screwed into the lower opening of the valve body 1 through a threaded connection of external and internal threads to achieve a fixed connection between them.

[0035] After assembly, the valve stem 2 is pressed downwards, and the upper end of the buffer column 31 extends upwards past the position of the nozzle 22, assisting in pushing the stored liquid upwards. When the valve stem 2 is pushed upwards by the spring 4, the buffer column 31 moves downwards, making room for the upper end of the buffer chamber 21, allowing the stored liquid originally stored inside to retract and be drawn back in, thus preventing dripping outside. However, if the diameter of the buffer chamber 21 is the same as that of the buffer column 31, it will block the nozzle 22 during the upward extension of the buffer column 31, causing the stored liquid in the filling chamber 11 to spray out unevenly. Therefore, the buffer chamber 21 is set in two parts, upper and lower. The diameter of the discharge chamber 211 at the upper end is larger than that of the mating chamber 212 at the lower end. The nozzle 22 in the discharge chamber 211 will not be blocked by the extension of the buffer column 31, and can spray out smoothly.

[0036] However, if the buffer chamber 21, which runs vertically through the tank, is not sealed in the middle, the stored liquid in the discharge chamber 211 may enter the tank along the mating chamber 212 during the upward extension of the buffer column 31. Alternatively, if the tank is under high pressure, the stored liquid may enter the discharge chamber 211 from the mating chamber 212, resulting in excessive spray volume and causing the metering valve to lose its original metering function. Therefore, the valve stem 2 is configured with two parts: the discharge chamber 211 is located in the upper stem 24, and the mating chamber 212 is located in the lower stem 25. A sealing ring 26 is installed at the connection between the upper stem 24 and the lower stem 25, thereby achieving the function of the buffer column 31. 1. During the up-and-down movement, the stored liquid is well separated in the discharge chamber 211 and the mating chamber 212. In order to facilitate the assembly of the valve stem 2 and fix the sealing ring 26, a coaxial stud 241 is provided at the lower end of the upper rod 24, and a coaxial screw hole 251 with an inward recess is provided on the upper end face of the lower rod 25. An installation groove 252 for the sealing ring 26 to be embedded is provided at the bottom of the screw hole 251. After the sealing ring 26 is assembled, the stud 241 is screwed into the screw hole 251, and the lower end face of the stud 241 abuts against the sealing ring 26, thereby fixing the sealing ring 26 and preventing its position from shifting.

[0037] The beneficial effects of this utility model are as follows: through the downward-penetrating buffer cavity 21, the buffer column 31 on the sealing cover 3 can extend into the buffer cavity 21. During the up-and-down movement of the valve stem 2, the buffer column 31 can assist in pushing the stored liquid to spray outwards, and can also retract the residual stored liquid during the upward movement of the valve stem 2 to prevent it from dripping outwards, thereby avoiding pollution of the external environment. Even if the stored liquid is a corrosive liquid, it can greatly prevent it from dripping and injuring people.

[0038] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A metering valve, characterized in that: Includes valve body, valve stem, and sealing cap; The valve body has a through-hole structure and a filling chamber is provided inside the valve body; The valve stem has a buffer chamber that runs vertically through it, and the outer wall of the valve stem has a spray hole that communicates with the buffer chamber. The valve stem passes through the filling chamber from top to bottom, and the valve stem fits into the upper opening of the valve body and seals the spray hole. The sealing cover is detachably connected to the lower opening of the valve body. The upper surface of the sealing cover is provided with a buffer column that cooperates with the buffer chamber. During the downward movement of the valve stem, the spray hole extends into the filling chamber. The sealing cover is provided with several through holes.

2. The metering valve according to claim 1, characterized in that: The filling chamber is surrounded by an internal washer and a lip washer. The valve stem is a rod-shaped structure that is larger at the top and smaller at the bottom. The spray hole is located at the upper end of the valve stem and abuts against the internal washer. The lip washer abuts against the gradually changing transition point in the middle of the valve stem.

3. The metering valve according to claim 2, characterized in that: It also includes a spring, and a limiting post is provided on the outer side wall of the lower end of the valve stem. The spring is fitted onto the lower end of the valve stem, and the upper and lower ends of the spring abut against the limiting post and the sealing cover, respectively.

4. The metering valve according to claim 3, characterized in that: The buffer chamber consists of two parts: a discharge chamber (larger at the top and smaller at the bottom) and a mating chamber. The spray nozzle is connected to the discharge chamber. During the downward movement of the valve stem, the upper end of the buffer column extends from the mating chamber into the discharge chamber.

5. The metering valve according to claim 4, characterized in that: The valve stem consists of an upper rod, a lower rod, and a sealing ring. The discharge chamber is located inside the upper rod, and the mating chamber is located inside the lower rod. The upper rod is detachably connected to the lower rod. The sealing ring is located at the connection between the upper rod and the lower rod, and the upper end of the buffer column is mated inside the sealing ring.

6. The metering valve according to claim 5, characterized in that: The lower end face of the upper rod is provided with a downwardly extending stud, and the upper end face of the lower rod is provided with an inwardly recessed screw hole. The bottom of the screw hole is provided with a mounting groove, the sealing ring is embedded in the mounting groove, and the stud is screwed into the screw hole.

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