Air inlet structure of a cream pump

Abstract

The utility model provides a kind of air intake structure of emulsion pump, belong to container accessory technical field.It solves the problem of low reliability of the air intake structure of existing emulsion pump.The air intake structure of this emulsion pump, emulsion pump includes the rotating cap with guide cylinder, gland with liquid outlet and is fixed in the bottom of guide cylinder and is connected with the liquid outlet of gland suction tube, air intake structure includes the air inlet and valve piece being opened on the lateral wall of guide cylinder, the upper edge of valve piece is integrally injection moulded with guide cylinder by plastic, and the valve piece of plastic material is sheet shape and can be bent deformation, valve piece is located the outside of air intake, the upper side of valve piece is opposite with air intake, lower side is opposite with the outer wall of guide cylinder, and there is gap between the lower side of valve piece and the outer wall of guide cylinder.The air intake structure of this emulsion pump guarantees use reliability while simplifying structure.

Description

Technical Field

[0001] This utility model belongs to the field of container accessories technology, and relates to an air intake structure for an emulsion pump. Background Technology

[0002] An emulsion pump is a pump device that delivers liquid from a container to the outside of the container by pressing, according to a predetermined metering method, so as to achieve hygienic and controllable liquid dispensing. It is widely used in various cosmetics and toiletries such as bath products. It typically includes a screw cap for connecting to the container, a suction tube that extends into the container, and a pressure cap that can be pressed up and down. The pressure cap has a liquid outlet that is connected to the suction tube. Pressing the pressure cap can pump the emulsion from the liquid outlet in the container. When the pressure cap is released, the pressure cap returns to its original position, creating a negative pressure inside the container. It is necessary to introduce air into the container from the outside. Therefore, some emulsion pumps are also equipped with an air intake structure.

[0003] The pump-type liquid packaging bottle disclosed in patent document (application number: 200710180805.9) includes a cap, which consists of an upper cap and a lower cap that can slide relative to each other. The lower cap is connected to the bottle mouth of the container, and the upper cap is connected to a straw. A valve cap is also provided at the connection between the upper cap and the straw. This valve cap allows the emulsion in the straw to flow upward in one direction when the upper cap is pressed down. An air inlet pipe is also provided on the upper cap. The valve cap has a lip that is located outside the straw and covers the lower end of the air inlet pipe. Therefore, the lip can only bend downward, thus forming a one-way air inlet valve that can only be opened from the inside. The valve cap is made of a flexible soft material and needs to be installed and fixed between the upper cap and the straw through a later assembly process. The structure is relatively complex and the processing is relatively troublesome. In particular, the lip of the soft material is always against the end of the air inlet pipe. During long-term storage, the lip is prone to sticking to the end face of the air inlet pipe, making it difficult to open and close, resulting in low reliability. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an air intake structure for an emulsion pump that simplifies the structure while ensuring reliable operation.

[0005] The objective of this utility model can be achieved through the following technical solution: an air intake structure for an emulsion pump, the emulsion pump comprising a screw cap with a guide cylinder, a pressure cap vertically inserted from the top opening of the guide cylinder and having a liquid outlet, and a suction tube fixed to the bottom of the guide cylinder and connected to the liquid outlet of the pressure cap, characterized in that the air intake structure comprises an air inlet and a valve plate formed on the side wall of the guide cylinder, the upper edge of the valve plate being integrally injection molded with the guide cylinder by plastic, and the plastic valve plate being thin and capable of bending and deformation, the valve plate being located outside the air inlet, the upper side of the valve plate being opposite to the air inlet, the lower side being opposite to the outer wall of the guide cylinder, and a gap being formed between the lower side of the valve plate and the outer wall of the guide cylinder.

[0006] This emulsion pump is used in conjunction with an emulsion bottle. After inserting the straw and guide tube into the bottle opening, tighten the cap. The cap is fixed to the bottle opening and forms a seal. At this point, the guide tube is roughly located in the upper part of the emulsion bottle, with its radial outer side being the inner cavity of the bottle. The radial inner side of the guide tube communicates with the outside through an opening at the top. The valve plate is located outside the air inlet, i.e., on one side of the emulsion bottle's inner cavity. When dispensing emulsion, press the cap. The cap moves downward within the guide tube, increasing the gas pressure inside the emulsion bottle and creating positive pressure that acts on the valve plate. The valve plate bends and deforms towards the air inlet, and its lower part presses against the outer wall of the guide tube, sealing the air inlet and preventing leakage or pressure drop. This allows the emulsion to be dispensed from the outlet of the straw and cap, ensuring effective dispensing. When the cap is released, it moves upward, reducing the air pressure inside the emulsion bottle and creating a negative pressure. The plastic valve plate deforms and returns to its original position due to its elasticity. Air enters the emulsion bottle's inner cavity from the inside of the guide tube through the air inlet and the gap between the valve plate and the outer wall of the guide tube. The valve plate and guide tube are integrally injection molded from plastic, eliminating the need for an additional rubber diaphragm assembly. This results in a simple structure and easy processing. Furthermore, the valve plate, made of the same material as the guide tube, does not require disassembly and sorting during recycling, facilitating reuse. The gap between the lower side of the valve plate and the outer wall of the guide tube not only facilitates air intake but also prevents the existing rubber diaphragm from sticking together after prolonged storage, ensuring reliable operation.

[0007] In the air intake structure of the emulsion pump described above, the lower end of the valve plate is inclined towards the outer wall of the guide cylinder on the side where the air inlet is located, so that the gap width between the lower side of the valve plate and the outer wall of the guide cylinder gradually decreases from top to bottom. The valve plate is inclined, and when the air pressure inside the emulsion bottle increases, the inclined valve plate is more likely to deform and abut against the outer wall of the guide cylinder, ensuring the timeliness and reliability of sealing the air inlet when pressing to dispense liquid. When the emulsion bottle is tilted or placed horizontally, the viscous emulsion inside the emulsion bottle can also act on the valve plate. The inclined valve plate can abut against the outer wall of the guide cylinder under the action of the emulsion to seal the air inlet and prevent the emulsion from leaking from the air inlet.

[0008] In the air intake structure of the emulsion pump described above, the thickness of the valve plate gradually decreases from top to bottom. The upper end of the valve plate is relatively thicker to ensure the connection strength with the guide cylinder, while the lower end is thinner, which is more conducive to bending deformation and fitting against the outer wall of the guide cylinder, and the fit is better.

[0009] In the air intake structure of the emulsion pump described above, the vertical length of the lower part of the valve plate opposite to the outer wall of the guide cylinder is greater than or equal to half the vertical length of the valve plate. When the cap is pressed, causing the air pressure inside the emulsion bottle to increase instantaneously, the valve plate has a sufficiently large area to abut against the outer wall of the guide cylinder to ensure reliable sealing, prevent gas leakage, and make the pressing and dispensing process more efficient.

[0010] In the air intake structure of the emulsion pump described above, the guide cylinder has a cylindrical outer circumferential surface. A clearance notch is provided on the outer circumferential surface of the guide cylinder. This clearance notch has a horizontal top surface and a vertical bottom surface. The outer wall of the guide cylinder includes the cylindrical outer circumferential surface and the bottom surface of the clearance notch. The air inlet penetrates the upper part of the bottom surface of the clearance notch. The valve plate is located inside the clearance notch, and the upper edge of the valve plate is fixed to the top surface of the clearance notch. The lower side of the valve plate is opposite to the bottom surface of the clearance notch. The clearance notch is used to accommodate the valve plate, preventing the valve plate from protruding outward from the outer circumferential surface of the guide cylinder and being easily damaged before assembly. The valve plate located inside the clearance notch is also easy to injection mold. The clearance notch also has a flow-concentrating effect. When the pressure inside the emulsion bottle increases due to pressing the cap, the airflow can be concentrated on the valve plate under the flow-concentrating effect of the clearance notch, ensuring the reliability of the valve plate sealing the air inlet.

[0011] In the air intake structure of the emulsion pump described above, the clearance notch has two opposing and vertically arranged sidewalls, and the two side edges of the valve plate abut against the two side walls of the clearance notch. The abutment of the two side walls of the clearance notch against the two side edges of the valve plate not only fully covers the air intake, maintains the valve plate's posture, and guides it when it bends, ensuring stability and reliability. Furthermore, the abutment of the two side edges of the valve plate against the side walls prevents gas leakage from the side edges when the cap is pressed, and also prevents emulsion leakage when the emulsion bottle is tilted or placed horizontally.

[0012] In the air intake structure of the emulsion pump described above, there is a gap between the lower edge of the valve plate and the bottom surface of the clearance notch, and the width of this gap is 0.03mm to 0.3mm. This gap is used for the core-pulling process during injection molding, and the small gap can prevent the leakage of viscous emulsion when the emulsion bottle is tilted or placed horizontally.

[0013] In the air intake structure of the emulsion pump described above, the lower part of the guide cylinder is conical, and the inner wall of the guide cylinder has a conical guide wall with the smaller end facing downwards. The air inlet extends through the guide wall, which has several inwardly protruding and vertically arranged ribs. The cap has a vertically arranged mounting cylinder, and the bottom outer edge of the mounting cylinder has a protruding limiting flange. The mounting cylinder is vertically slidably inserted into the guide cylinder, and the limiting flange abuts against the ribs. The guide wall is conical, so when the cap is pressed, the lower end of the mounting cylinder can bend radially inwards under the action of the ribs to store energy. When the cap is released, the deformation of the lower end of the mounting cylinder can be reset, thereby generating an upward thrust on the cap. The ribs create a gap between the lower end of the mounting cylinder and the guide wall, allowing air entering through the top opening of the guide cylinder to pass through and enter the air inlet.

[0014] In the air intake structure of the emulsion pump described above, the inner wall of the guide cylinder also has an inwardly protruding limiting flange. This limiting flange is located at the large end of the guide wall, and there are several limiting flanges distributed along the circumference of the guide cylinder. An air passage gap is formed between two adjacent limiting flanges. The limiting flange is used to block and limit the limiting flange after the cap is reset upward, ensuring the stability of the cap. When the cap is pressed down, the mounting cylinder moves downward relative to the guide cylinder, which increases the air pressure inside the guide cylinder. The air passage gap is used to release the gas in the guide cylinder when the cap is pressed down, reducing the pressing resistance and improving the operating feel.

[0015] In the air intake structure of the emulsion pump described above, the cap and guide cylinder are integrally injection molded from plastic, and the pressure cap and mounting cylinder are also integrally injection molded from plastic. This simplifies the structure and processing technology, and also facilitates later recycling and reuse.

[0016] Compared with existing technologies, the air intake structure of this emulsion pump has the following advantages:

[0017] 1. Since the valve plate and guide cylinder are made of plastic injection molding in one piece, there is no need to assemble the rubber diaphragm separately. Therefore, the structure is simple and easy to process. Moreover, the valve plate, which is made of the same material as the guide cylinder, does not need to be disassembled and sorted during recycling, which facilitates recycling and reuse.

[0018] 2. Because there is a gap between the lower side of the valve plate and the outer wall of the guide cylinder, it not only facilitates air intake, but also avoids the phenomenon that existing rubber diaphragms will stick together and become unable to open and close after long-term storage, thus ensuring reliable use.

[0019] 3. Since the lower end of the valve plate is inclined towards the outer wall of the guide tube on the side where the air inlet is located, when the emulsion bottle is tilted or placed horizontally, the viscous emulsion in the emulsion bottle can also act on the valve plate. The inclined valve plate can stick to the outer wall of the guide tube under the action of the emulsion and block the air inlet, thus preventing the emulsion from leaking from the air inlet. Attached Figure Description

[0020] Figure 1 This is a 3D structural diagram of an emulsion pump.

[0021] Figure 2 This is a partial structural cross-sectional view of an emulsion pump.

[0022] Figure 3 yes Figure 2 Enlarged view of the structure at point A in the middle.

[0023] Figure 4 This is a three-dimensional structural diagram of the screw cap.

[0024] Figure 5 This is a three-dimensional structural diagram of the screw cap from another perspective.

[0025] Figure 6This is a schematic diagram of the three-dimensional structure of the pressure cap.

[0026] In the diagram, 1. Screw cap; 11. Guide cylinder; 111. Air inlet; 112. Valve plate; 113. Relief notch; 114. Guide wall; 115. Rib; 116. Limiting flange; 117. Air passage notch; 118. Limiting step; 12. Connecting part; 13. Piston tube; 131. One-way valve cap; 2. Pressure cap; 21. Liquid outlet; 22. Mounting cylinder; 221. Limiting flange; 222. Deformation notch; 23. Liquid outlet pipe; 3. Suction tube. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] like Figure 1 , Figure 2 As shown, an air intake structure for an emulsion pump includes a screw cap 1, a pressure cap 2, and a suction tube 3. The screw cap 1 has internal threads for fixing it to the mouth of a container such as an emulsion bottle. A guide tube 11 is located at the center of the screw cap 1. The top of the guide tube 11 is open, and the bottom has a vertically downward-facing connecting part 12. The upper end of the suction tube 3 is inserted into and secured to the connecting part 12. The pressure cap 2 has a liquid outlet 21 facing one side. The pressure cap 2 also has a vertically downward-facing mounting cylinder 22 and a liquid outlet pipe 23. The liquid outlet pipe 23 is located inside the mounting cylinder 22, and its upper end is aligned with the liquid outlet 21. A piston tube 13 is vertically installed inside the guide tube 11 of the screw cap 1. The piston tube 13 has a one-way valve cap 131, which allows the emulsion to flow from bottom to top but prevents the emulsion from flowing back from top to bottom. The lower end of the piston tube 13 is inserted into the upper end of the straw 3, and the outer wall of the piston tube 13 is sealed to the inner wall of the straw 3. The mounting cylinder 22 of the cap 2 slides downward from the opening at the top of the guide cylinder 11 and is inserted into the guide cylinder 11. The lower end of the liquid outlet tube 23 is inserted into the upper end of the piston tube 13 and is snapped and fixed. Before the first use, the piston tube 13 is connected to the inner wall of the connecting part 12 of the guide cylinder 11 through a weakened point. When the cap 2 is pressed for the first time, the liquid outlet tube 23 of the cap 2 pushes the piston tube 13 downward, which can break the point between the piston tube 13 and the connecting part 12. The piston tube 13 and the liquid outlet tube 23 move synchronously. Therefore, when not in use, the point connection between the piston tube 13 and the connecting part 12 plays an anti-counterfeiting role, preventing the used or used emulsion pump from being recycled and reused. The pressure cap 2, mounting cylinder 22 and liquid outlet pipe 23 are made of plastic integral injection molding, and the screw cap 1, guide cylinder 11, piston pipe 13 and one-way valve cap 131 are made of plastic integral injection molding.

[0029] Combination Figure 3 , Figure 4As shown, the intake structure includes a valve plate 112, and the guide cylinder 11 is a cylinder. The lower part of the guide cylinder 11 is a cone-shaped cylinder with the small end facing down, that is, the guide cylinder 11 has a cone-shaped outer peripheral surface. A clearance notch 113 is provided on the outer peripheral surface of the guide cylinder 11. The clearance notch 113 has a horizontal top surface, a vertical bottom surface facing outward, and two opposite and vertically arranged side walls. Therefore, the outer wall of the guide cylinder 11 includes a cone-shaped outer peripheral surface and a bottom surface of the clearance notch 113. An air inlet 111 is provided on the upper part of the bottom surface of the clearance notch 113. The air inlet 111 penetrates into the inner cavity of the guide cylinder 11. The valve plate 112 is located inside the clearance notch 113, and the upper edge of the valve plate 112 and the top surface of the clearance notch 113 are integrally injection molded from plastic. The plastic valve plate 112 is thin and flexible. The valve plate 112 is rectangular in shape and located outside the air inlet 111. Its two side edges are abutted against the side walls of the clearance notch 113. The upper side of the valve plate 112 faces the air inlet 111, and the lower side faces the bottom surface of the clearance notch 113, with a gap between them. The lower end of the valve plate 112 slopes towards the side of the air inlet 111, i.e., towards the bottom surface of the clearance notch 113, causing the gap between the lower side of the valve plate 112 and the bottom surface of the clearance notch 113 to gradually decrease from top to bottom. The gap between the lower edge of the valve plate 112 and the bottom surface of the clearance notch 113 is 0.03mm to 0.3mm, preferably 0.05mm in this embodiment. The vertical length of the lower part of the valve plate 112 opposite to the clearance notch 113 is greater than half of the vertical length of the valve plate 112, and the thickness of the valve plate 112 gradually decreases from top to bottom.

[0030] Combination Figure 5 , Figure 6As shown, the inner wall of the guide cylinder 11 has a conical guide wall 114 with the small end facing downward. The guide wall 114 has several inwardly protruding ribs 115, all of which are vertically arranged and distributed circumferentially. The bottom outer edge of the mounting cylinder 22 has a protruding limiting flange 221, which abuts against the ribs 115. The side wall of the mounting cylinder 22 also has a vertical deformation notch 222 that penetrates the bottom edge of the mounting cylinder 22. There are several deformation notches 222, which are evenly distributed circumferentially along the mounting cylinder 22, so that the lower end of the mounting cylinder 22 is divided circumferentially to form a multi-lobed plastic spring. The inner wall of the guide cylinder 11 also has an inwardly protruding limiting flange 116, which is located at the large end of the guide wall 114. Several limiting flanges 116 are evenly distributed along the circumference of the guide cylinder 11, and an air passage gap 117 is formed between adjacent limiting flanges 116. A limiting step 118 is located at the small end of the guide wall 114 on the inner wall of the guide cylinder 11. When the pressure cap 2 is pressed, the mounting cylinder 22 moves downward and abuts against the limiting step 118. At this time, the lower end of the mounting cylinder 22 can radially contract and elastically deform to store energy under the action of the rib 115. When the pressure cap 2 is released, it can move upward and reset under the elastic force of the lower end of the mounting cylinder 22 until the limiting flange 221 abuts against the limiting flange 116, thus limiting the reset stroke of the pressure cap 2.

[0031] This emulsion pump is used in conjunction with an emulsion bottle. After inserting the straw 3 and guide tube 11 into the bottle opening, the cap 1 is tightened, fixing the cap 1 to the bottle opening and forming a seal. The radial outer side of the guide tube 11 is the inner cavity of the emulsion bottle, and the radial inner side of the guide tube 11 is connected to the outside through the air passage 117 and the opening at the top. When pumping emulsion, the cap 2 is pressed, and the lower part of the mounting tube 22 radially contracts and deforms under the action of the rib 115 to store energy. The piston tube 13 moves downward relative to the straw 3, which increases the gas pressure in the emulsion bottle cavity, forming a positive pressure that acts on the valve plate 112. The valve plate 112 bends and deforms towards the air inlet 111, and the lower part of the valve plate 112 abuts against the bottom surface of the clearance notch 113, blocking the air inlet 111 and preventing the emulsion bottle from leaking air and depressurizing. The emulsion passes through the straw 3, piston tube 13, and outlet tube 23 in sequence and is pumped out from the outlet 21 of the cap 2. When the cap 2 is released, the cap 2 moves upward under the elastic force of the lower part of the mounting cylinder 22, the air pressure in the inner cavity of the emulsion bottle decreases and a negative pressure is formed, and the plastic valve plate 112 can deform and reset under its own elastic force. Air enters the inner cavity of the emulsion bottle from the inside of the guide cylinder 11 through the air inlet 111 and the gap between the valve plate 112 and the bottom surface of the clearance notch 113.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0033] Although this document uses terms such as screw cap 1, guide cylinder 11, and air inlet 111 frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. An air intake structure for an emulsion pump, the emulsion pump comprising a screw cap (1) having a guide tube (11), a pressure cap (2) vertically inserted from the top opening of the guide tube (11) and having a liquid outlet (21), and a suction tube (3) fixed to the bottom of the guide tube (11) and communicating with the liquid outlet (21) of the pressure cap (2), characterized in that, The air intake structure includes an air intake port (111) and a valve plate (112) on the side wall of the guide cylinder (11). The upper edge of the valve plate (112) is integrally injection molded with the guide cylinder (11) by plastic. The plastic valve plate (112) is thin and can be bent and deformed. The valve plate (112) is located outside the air intake port (111). The upper side of the valve plate (112) is opposite to the air intake port (111), and the lower side is opposite to the outer wall of the guide cylinder (11). There is a gap between the lower side of the valve plate (112) and the outer wall of the guide cylinder (11).

2. The air intake structure of the emulsion pump according to claim 1, characterized in that, The lower end of the valve plate (112) is inclined toward the outer wall of the guide cylinder (11) on the side where the air inlet (111) is located, so that the gap width between the lower side of the valve plate (112) and the outer wall of the guide cylinder (11) gradually decreases from top to bottom.

3. The air intake structure of the emulsion pump according to claim 2, characterized in that, The thickness of the valve plate (112) gradually decreases from top to bottom.

4. The air intake structure of the emulsion pump according to claim 3, characterized in that, The vertical length of the lower part of the valve plate (112) opposite to the outer wall of the guide cylinder (11) is greater than or equal to half the vertical length of the valve plate (112).

5. The air intake structure of the emulsion pump according to any one of claims 1 to 4, characterized in that, The guide cylinder (11) has a cylindrical outer peripheral surface. A clearance notch (113) is provided on the outer peripheral surface of the guide cylinder (11). The clearance notch (113) has a horizontal top surface and a vertical bottom surface. The outer wall of the guide cylinder (11) includes a cylindrical outer peripheral surface and the bottom surface of the clearance notch (113). The air inlet (111) penetrates the upper part of the bottom surface of the clearance notch (113). The valve plate (112) is located inside the clearance notch (113), and the upper edge of the valve plate (112) is fixed on the top surface of the clearance notch (113). The lower side of the valve plate (112) is opposite to the bottom surface of the clearance notch (113).

6. The air intake structure of the emulsion pump according to claim 5, characterized in that, The clearance notch (113) has two opposite and vertically arranged sidewalls, and the two side edges of the valve plate (112) are in contact with the two side walls of the clearance notch (113).

7. The air intake structure of the emulsion pump according to claim 5, characterized in that, There is a gap between the lower edge of the valve plate (112) and the bottom surface of the clearance notch (113), and the width of the gap is 0.03mm to 0.3mm.

8. The air intake structure of the emulsion pump according to any one of claims 1 to 4, characterized in that, The lower part of the guide cylinder (11) is conical. The inner wall of the guide cylinder (11) has a conical guide wall (114) with the small end facing down. The air inlet (111) extends through the guide wall (114). The guide wall (114) has several inwardly protruding and vertically arranged ribs (115). The pressure cap (2) has a vertically arranged mounting cylinder (22). The bottom outer edge of the mounting cylinder (22) has a protruding limiting flange (221). The mounting cylinder (22) is vertically slidably inserted into the guide cylinder (11), and the limiting flange (221) abuts against the ribs (115).

9. The air intake structure of the emulsion pump according to claim 8, characterized in that, The inner wall of the guide cylinder (11) also has an inwardly protruding limiting edge (116), which is located at the large end of the guide wall (114). There are several limiting edges (116) distributed along the circumference of the guide cylinder (11), and an air passage gap (117) is formed between two adjacent limiting edges (116).

10. The air intake structure of the emulsion pump according to claim 8, characterized in that, The cap (1) and guide cylinder (11) are integrally injection molded from plastic, and the pressure cap (2) and mounting cylinder (22) are integrally injection molded from plastic.

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