Ointment pump

Abstract

The invention relates to a paste pump. The paste pump comprises a tube body, a one-way airtight unit and a pump-out unit. The pump-out unit comprises an elastic bowl body and an end cover which jointly define a quantitative preparation discharging cavity, and an inlet one-way valve and an outlet one-way valve which respectively control feeding and discharging of the preparation discharging cavity; a user drives the elastic bowl body to deform through pressing so as to compress the preparation discharging cavity to achieve paste pumping out. The one-way airtight unit moves in the tube body in a one-way mode to compensate for paste consumption. According to the paste preparation device, the quantitative preparation discharging cavity is arranged, so that paste can be accurately and consistently pumped out; through cooperative work of the two one-way valves of the inlet and the outlet, the paste is effectively isolated from being in contact with outside air, and contamination and dryness of the content are prevented.

Description

Technical Field

[0001] The present application relates to the technical field of daily chemical products, and in particular to an ointment pump. Background Art

[0002] Pump containers, a widely used packaging format for cosmetics, personal care products, and pharmaceuticals, are highly sought after for their ease of use and ability to minimize direct contact between the contents and the outside world. Especially for viscous or semi-fluid materials like creams and gels, pumps offer significant advantages in hygiene and convenience over traditional wide-mouth bottles or squeeze tubes.

[0003] However, existing conventional cream pumps still face several inherent technical bottlenecks in terms of functionality and performance. First, regarding the accuracy of metered dispensing, the amount of material discharged by traditional pump heads is directly related to the user's pressure, speed, and stroke, making it difficult to achieve accurate and consistent metered dispensing. For cosmeceuticals or costly serum-based skincare products, which require precise dosage control, this uncertainty often leads to improper dosage or unnecessary waste.

[0004] Secondly, in terms of product sealing and preservation, the existing technology has obvious defects. On the one hand, after each pumping, a small amount of paste will inevitably remain at the discharge port. This part of the paste is directly exposed to the air and is very likely to dry and solidify, forming a blockage, or become a breeding ground for microorganisms, affecting the hygiene and safety of the product. On the other hand, what is more serious is that when many pump heads rebound and reset after being pressed, a negative pressure will be formed in the pump cavity. If there is no effective anti-backflow mechanism, the outside air will be sucked back into the pump cavity and even the product's storage cavity. The inhaled air, especially the oxygen in it, will accelerate the oxidation and failure of the active ingredients in the contents, causing the product to deteriorate, stratify or discolor, thereby shortening the effective shelf life of the product.

[0005] Furthermore, during the full lifecycle of use, some pump containers experience difficulty pumping out or "cream breakage" after the contents are reduced. This is usually due to air entering the reservoir or the internal piston failing to follow up properly, resulting in cavities or breakage in the cream column. Users need to repeatedly pump the cream without using it, which seriously affects the user experience and makes it difficult to fully utilize the material at the bottom of the container, resulting in waste. Summary of the Invention

[0006] In order to simultaneously solve the problems of inaccurate quantitative measurement, poor sealing resulting in easy contamination and degradation of the contents, and inability to discharge the material stably and completely, the present application provides a paste pump.

[0007] The present application provides an ointment pump, which adopts the following technical solution: A paste pump, comprising: tube body; a one-way airtight unit, disposed at the lower end of the tube body, sealingly cooperating with the inner wall of the tube body, and configured to be able to slide one-way along the inner wall of the tube body toward the upper end; A pumping unit is provided at the upper end of the tube body, wherein the pumping unit, the tube body and the one-way airtight unit jointly define a storage cavity for storing the ointment; Wherein, the pumping unit comprises: an elastic bowl body, the edge of which is fixedly connected to the inner wall of the tube body; An end cover is provided below the elastic bowl body, a pre-discharge cavity is formed between the elastic bowl body and the end cover, and a through hole is provided on the end cover to connect the storage cavity and the pre-discharge cavity; a paste discharge assembly mounted on the elastic bowl body and having a paste discharge channel communicating with the prepared discharge cavity, wherein the paste discharge assembly is configured to cause the elastic bowl body to deform when pressed to compress the prepared discharge cavity; a telescopic one-way valve, disposed at the through hole, for opening when the elastic bowl body is reset to allow the paste to flow from the storage cavity into the preparatory discharge cavity in one direction, and for closing when the elastic bowl body is compressed and deformed; The paste discharge one-way valve is arranged at the end of the paste discharge channel and is used to open when the preparatory discharge cavity is compressed to allow the paste to be pumped out in one direction.

[0008] Optionally, a first limiting ring is formed on the side wall of the tube body, and the edge of the end cover abuts against the top of the first limiting ring.

[0009] Optionally, the tube body protrudes toward the inside of the tube body above the first limiting ring and the protrusion bends toward the first limiting ring to form a first plug-in gap; the outer edge of the elastic bowl body is formed with a convex edge upward, the upper end of the convex edge is embedded in the first plug-in gap, and the lower end of the convex edge abuts against the top of the edge of the end cover.

[0010] Optionally, a second limiting ring is provided on the end cover around the through hole, and the telescopic one-way valve includes a support ring, a plurality of elastic spiral arms and the elastic valve plate, the support ring is mounted on the end cover and fixed to the second limiting ring, one end of the elastic spiral arm is connected to the inner wall of the support ring, and the other end is bent, extended and connected toward the outer wall of the elastic valve plate, and the plurality of elastic spiral arms are evenly arranged around the center of the elastic valve plate.

[0011] Optionally, the inner edge of the end cover at the through hole is bent toward the paste outlet channel to form an abutment surface facing the paste outlet channel, and the elastic valve plate abuts against the abutment surface.

[0012] Optionally, a sealing groove is provided on the abutting surface, and a sealing protrusion is provided on the elastic valve plate, and the sealing protrusion is embedded in the sealing groove.

[0013] Optionally, the paste dispensing assembly includes a cover body, a paste dispensing nozzle, a pressing member, and a clamping limit member, wherein the pressing member is provided with a pressing portion for receiving a pressing force, and the pressing member is provided with a support shaft extending in a direction perpendicular to the pressing force, wherein the middle portion of the support shaft is connected to the paste dispensing nozzle shaft, and the end portion of the support shaft abuts against the top wall of the cover body; The paste outlet channel is formed in the paste outlet nozzle and has a paste inlet and a paste outlet at both ends respectively. The side wall of the paste outlet channel is formed with at least two steps at the paste inlet. The paste outlet one-way valve is installed in the paste outlet channel and its edge abuts against the first step; the clamping limiter is fixedly installed in the paste outlet channel and presses the edge of the paste outlet one-way valve against the first step.

[0014] Optionally, the paste-discharging one-way valve has a closed paste-discharging end, an open connecting end, and a neck connecting the paste-discharging end and the connecting end; a cutout that can be opened by paste pressure is provided in the center of the paste-discharging end.

[0015] Optionally, the incision includes 4 to 8 grooves, which extend outward from the middle of the paste outlet end and are evenly arranged around the center of the paste outlet end.

[0016] Optionally, the outer periphery of the joint end of the paste outlet one-way valve extends outward to form a flange, and the flange abuts against the first step of the paste outlet channel at the paste inlet.

[0017] Optionally, the edge of the clamping limiter abuts against the second step, and the outer side wall of the clamping limiter is clamped with the inner side wall of the paste outlet channel.

[0018] Optionally, the cutting groove divides the paste outlet end into a plurality of deformable and flippable valves.

[0019] Optionally, the valve is closed in a static state and forms a closed structure.

[0020] Optionally, the valve opens under the action of internal pressure and forms a star-shaped opening.

[0021] Optionally, the valve is a flippable three-dimensional elastic sheet structure surrounded by grooves.

[0022] Optionally, the incision includes two grooves that are arranged perpendicular to each other and intersect at the center of the paste outlet end to form a cross-shaped structure, and the two grooves divide the paste outlet end into four valve units; the middle area of ​​the valve unit on the side away from the intersection center of the grooves and the adjacent neck part are recessed toward the inside of the neck, so that the two sides of the recessed part form triangular arc surface segments.

[0023] Optionally, the top end of the elastic bowl body is converged into a tubular shape and extends outwards and is elastically sleeved on the outer side wall of the paste inlet of the paste outlet nozzle.

[0024] Optionally, the one-way airtight unit includes a piston and a one-way air inlet valve, the piston is slidably arranged in the tube and is sealed with the tube; the piston separates the storage material into a medium cavity and a gas cavity that are not connected to each other, the medium cavity is used to accommodate the paste, and the one-way air inlet valve is connected to the gas cavity, which is used to control the one-way entry of air into the gas cavity and block the escape of air from the gas cavity; the piston includes a plug body and a sealing sleeve, the sealing sleeve is arranged on the periphery of the plug body and is sealed to the inner wall of the accommodating cavity, and the sealing sleeve is in the shape of a tube with a concave middle part; a gap is formed between the sealing sleeve and the plug body, and the sealing sleeve has elastic deformation characteristics; the upper and lower ends of the sealing sleeve abut against the inner wall of the tube body.

[0025] In summary, the present invention has at least the following beneficial effects: 1. The present application is provided with a double one-way valve system. The telescopic one-way valve opens when replenishing the material and closes when pumping out, thereby preventing the backflow of the paste in the prepared discharge chamber. The paste discharge one-way valve serves as an outlet valve. It is composed of an automatically closing valve. It can immediately close the paste discharge channel after the pumping is completed, effectively preventing the outside air from being sucked back into the pump body when the pump head is reset. At the same time, it avoids the paste at the paste outlet from being in contact with the air for a long time and becoming dry or contaminated, thereby ensuring the hygiene and quality of the contents.

[0026] 2. This application incorporates a one-way, sliding, airtight unit at the lower end of the tube. This unit, which includes a piston and a one-way air inlet valve, utilizes external atmospheric pressure to steadily push the piston upward as the ointment is consumed, continuously applying thrust to the ointment within the storage chamber. This structure effectively prevents vacuum or faults within the storage chamber, ensuring that the ointment can be pumped out stably and smoothly from start to finish until its contents are essentially depleted, significantly improving the overall product utilization rate.

[0027] 3. This application separates the discharging action from the main storage chamber by providing a relatively fixed volume pre-discharging chamber defined by an elastic bowl and end cap within the pump unit. Each press only pumps out the paste in the pre-discharging chamber, thus eliminating the reliance on the user's pressure and duration, achieving precise and consistent quantitative dispensing, avoiding waste, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 1 is an overall schematic diagram of a paste pump according to an embodiment of the present invention.

[0029] Figure 2 An exploded view of a paste pump according to an embodiment of the present invention is shown.

[0030] Figure 3 for Figure 2 Longitudinal cross-section of .

[0031] Figure 4 A longitudinal cross-sectional view of a paste pump according to an embodiment of the present invention is shown.

[0032] Figure 5 A schematic diagram of a paste dispensing assembly according to an embodiment of the present invention is shown.

[0033] FIG6 is a schematic diagram of a telescopic one-way valve according to an embodiment of the present invention.

[0034] Figure 7 A schematic diagram of an end cap according to an embodiment of the present invention is shown.

[0035] Figure 8 A schematic diagram of a paste discharging one-way valve according to an embodiment of the present invention is shown.

[0036] Description of reference numerals: 1. Tube body; 12. First limiting ring; 13. First plug-in gap; 14. Preparatory discharge cavity; 15. Storage cavity; 2. Pumping unit; 21. Elastic bowl body; 211. Convex edge; 22. End cover; 221. Through hole; 222. Second limiting ring; 223. Sealing groove; 23. Paste dispensing assembly; 231. Cover; 232. Paste dispensing nozzle; 2321. Paste dispensing channel; 233. Pressing member; 2331. Support shaft; 234. Clamping limit member; 24. Telescopic one-way valve; 241. Support ring; 242. Elastic valve plate; 243. Elastic rotary arm; 244. Sealing protrusion; 25. One-way valve for discharging ointment; 251. Discharging end; 252. Connecting end; 253. Neck; 254. Incision; 255. Valve; 256. Flange; 3. One-way airtight unit; 31. Piston; 311. Medium cavity; 312. Gas cavity; 313. Plug body; 314. Sealing sleeve; 32. One-way air inlet valve; 33. Airtight base. DETAILED DESCRIPTION

[0037] The present application will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0038] In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of the inventive concepts. Some of the figures in the drawings of the present disclosure, which are part of this specification, represent structures and devices in block diagram form to avoid making the disclosed principles complicated and obscure. For the sake of clarity, not all features of an actual implementation are necessarily described. In addition, the language used in this disclosure has been selected primarily for readability and instructional purposes and may not have been selected to delineate or limit the subject matter of the invention, thereby resorting to the necessary claims to determine such inventive subject matter. References in this disclosure to "one embodiment" or "an embodiment" mean that the specific features, structures or characteristics described in conjunction with that embodiment are included in at least one embodiment, and multiple references to "one embodiment" or "an embodiment" should not be understood to necessarily all refer to the same embodiment.

[0039] Unless expressly limited, the terms "a", "an" and "the" are not intended to refer to a singular entity, but rather to include a general class of which a specific example may be used for illustration. Thus, the use of the term "a" or "an" may mean any number of at least one, including "one", "one or more", "at least one", and "one or more than one". The term "or" means any of the alternatives and any combination of the alternatives, including all, unless the alternatives are expressly indicated to be mutually exclusive. The phrase "at least one of" when combined with a list of items refers to a single item in the list or any combination of the items in the list. The phrase does not require all of the listed items unless expressly limited to that.

[0040] The present application embodiment discloses a paste pump, referring to Figure 1 The invention comprises a tube body 1, a pumping unit 2, and a one-way airtight unit 3. The pumping unit 2 is disposed at the upper end of the tube body 1 and is used to perform a quantitative pumping operation of the ointment. The one-way airtight unit 3 is disposed at the lower end of the tube body 1 and, together with the tube body 1, defines a storage chamber 15 for containing the ointment. During the pumping process, the one-way airtight unit 3 can move unidirectionally along the inner wall of the tube body 1 toward the pumping unit 2, thereby continuously applying pressure to the ointment in the storage chamber 15.

[0041] The paste pump provided in the embodiment of the present application, through the coordinated cooperation of the pumping unit 2 and the one-way airtight unit 3, can not only achieve accurate and consistent quantitative discharging, but also has excellent airtight performance due to its internal structure, which can effectively prevent the paste from being contaminated or drying out during use, while ensuring that the paste can be pumped out stably and thoroughly, significantly improving the product utilization rate and the overall user experience.

[0042] Specifically, refer to Figure 2 and Figure 3 The tube body 1 is the main structure that contains the ointment and various internal components. The cross-sectional shape of the tube body 1 can be set to circular, square or other polygonal shapes according to design requirements, but its inner wall must have a constant cross-sectional profile along its axial direction to ensure that the one-way airtight unit 3 can slide smoothly and unimpeded in one direction within the tube body 1. In terms of material selection, the tube body 1 is preferably made of non-toxic and chemically stable materials, such as food-grade or cosmetic-grade plastics such as polypropylene (PP) and polyethylene terephthalate (PET), to ensure that it will not react with the ointment contained therein, thereby ensuring the safety of the product.

[0043] Reference Figure 3-5 The one-way airtight unit 3 is provided at the lower end of the tube body 1 and forms a dynamic seal with the inner wall of the tube body 1. Its overall structure allows it to slide only in one direction along the inner wall of the tube body 1 toward the pumping unit, but not in the opposite direction, so that the paste in the storage chamber is always kept dense under the action of pressure.

[0044] In a specific embodiment, the one-way airtight unit 3 includes a piston 31, a one-way air inlet valve 32 and an airtight base 33. The piston 31 is slidably disposed in the tube body 1, and through the sealing cooperation between its circumference and the inner wall of the tube body 1, the space below the tube body 1 is divided into a medium cavity 311 and a gas cavity 312 that are not connected to each other. The medium cavity 311 is located above the piston 31 and is used to directly accommodate and push the paste, while the gas cavity 312 is located below the piston 31. The airtight base 33 is installed at the bottom of the sealed tube body 1 to separate the inside of the tube body 1 from the outside. The one-way air inlet valve 32 is installed on the airtight base 33 to allow the gas cavity 312 to be connected to the outside in one direction. Its function is to allow outside air to enter the gas cavity 312 in one direction to balance the internal pressure while preventing the air in the gas cavity 312 from escaping.

[0045] In order to achieve reliable one-way sliding and sealing, the structure of the piston 31 can be further optimized. For example, the piston 31 may include a plug body 313 and a sealing sleeve 314 arranged on the circumference of the plug body 313. The sealing sleeve 314 is a tubular structure with a concave waist, and the edges of the upper and lower ends abut against the inner wall of the tube body 1 and seal, and the middle part is connected to the plug body 313. A gap can be formed between the sealing sleeve 314 and the inner wall of the tube body 1, and the sealing sleeve 314 itself has the characteristic of elastic deformation. The purpose is to form a double-layer seal between the sealing sleeve 314 and the inner wall of the tube body 1. When the inner wall of the tube body 1 deforms and causes the seal of the upper or lower end of the sealing sleeve 314 to temporarily fail, the other end can still play a role.

[0046] When the internal pressure of the medium cavity 311 decreases, the piston 31 slides upward due to the pressure difference between the upper and lower sides, pushing the paste in the medium cavity 311 upward. At this time, the internal air pressure of the gas cavity 312 decreases and becomes less than the external atmospheric pressure, and the one-way air inlet valve 32 opens until the gas cavity 312 and the external air pressure are balanced. When the internal pressure of the medium cavity 311 increases, the piston 31 moves slightly downward, causing the internal air pressure of the gas cavity 312 to increase and become greater than the external atmospheric pressure. The one-way air inlet valve 32 closes, preventing the piston 31 from moving further downward.

[0047] Reference Figure 4-7 , the pumping unit 2 is installed as a whole at the upper end of the tube body 1. In one embodiment, the pumping unit 2 is mainly composed of an elastic bowl body 21, an end cover 22, a paste discharge assembly 23, a telescopic one-way valve 24 and a paste discharge one-way valve 25. The outer edge of the elastic bowl body 21 is fixedly connected to the inner wall of the upper end of the tube body 1 to form the basic structure and seal of the pump head. The end cover 22 is arranged below the elastic bowl body 21, and the two together form a preparatory discharge cavity 14 for quantitative discharge. The paste discharge assembly 23 is installed on the elastic bowl body 21 as a pressing component directly operated by the user, and its action will cause the elastic bowl body 21 to deform. The telescopic one-way valve 24 and the paste-discharging one-way valve 25 serve as the inlet valve and outlet valve of the preparatory discharge chamber 14 respectively. The telescopic one-way valve 24 controls the connection between the storage chamber 15 and the preparatory discharge chamber 14, while the paste-discharging one-way valve 25 controls the connection between the preparatory discharge chamber 14 and the outside. The two work together to ensure that the paste can flow in one direction and in an orderly manner.

[0048] Specifically, refer to Figure 7The end cap 22 is a roughly disc-shaped component that is installed below the elastic bowl body 21. The upper surface of the end cap 22 and the lower surface of the elastic bowl body 21 together form a relatively fixed volume pre-discharge chamber 14, which is used to pre-store a fixed amount of paste before each pumping action. In the central area of ​​the end cap 22, one or more through holes 221 are provided. These through holes 221 serve as communication channels, connecting the upper pre-discharge chamber 14 with the lower storage chamber 15. The paste is replenished from the storage chamber 15 to the pre-discharge chamber 14 through these through holes 221.

[0049] Reference Figure 3 and Figure 4 To ensure secure installation of the end cap 22, a first retaining ring 12 can be integrally formed along the circumference of the inner sidewall of the tube body 1 as a support structure. This first retaining ring 12 is an inwardly protruding annular step with a top support surface. The outer peripheral edge of the end cap 22 overlaps and abuts against the top support surface of the first retaining ring 12. The tube body 1 provides axial positioning and support for the end cap 22, ensuring that it does not move downward when subjected to pressure and paste pressure.

[0050] 6 , the telescopic one-way valve 24 serves as the feed control valve for the pre-discharge chamber 14. It is located at the through-hole 221 of the end cap 22 and is responsible for controlling the one-way flow of the paste from the storage chamber 15 to the pre-discharge chamber 14. When the elastic bowl 21 is deformed under pressure, the telescopic one-way valve 24 closes to prevent the paste in the pre-discharge chamber 14 from flowing back into the storage chamber 15. When the elastic bowl 21 returns to its original position, the telescopic one-way valve 24 opens to allow the paste to enter the pre-discharge chamber 14 under negative pressure for replenishment.

[0051] In one specific embodiment, referring to Figures 6 and 7 , to securely position the telescopic check valve 24, a second retaining ring 222 can be provided on the end cap 22 surrounding its through hole 221. The telescopic check valve 24 primarily comprises a support ring 241, an elastic valve plate 242, and a plurality of elastic arms 243 connecting the two. The support ring 241 serves as a fixed base, mounted on the end cap 22 and secured to the second retaining ring 222 via a snap-fit ​​or other means. The elastic valve plate 242 is the movable component that seals and opens the through hole 221.

[0052] The elastic arms 243 connecting the support ring 241 and the elastic valve plate 242 are used to realize the one-way valve function. One end of each elastic arm 243 is connected to the inner wall of the fixed support ring 241, and the other end is bent toward the outer wall of the elastic valve plate 242 in a smooth curve and connected thereto. A plurality of elastic arms 243 are arranged in a uniform radial or circumferential array with the center of the elastic valve plate 242 as a reference. Figure 6a and Figure 6bThe shape of the elastic arm 243 can be different, as long as it can make the elastic valve plate 242 bend upward and straighten due to the paste flow, so that the elastic valve plate 242 is relatively away from the support ring 241 and the through hole 221 is opened. Figure 6b and Figure 6c The design of different numbers of elastic rotary arms 243 can make the opening threshold of the elastic valve plate different, which can be set as needed. Figure 6b and Figure 6d In different embodiments, the radial width of the support ring can also be adaptively adjusted as needed. In summary, the elastic swing arm 243 enables the elastic valve plate 242 to stably perform axial reciprocating movement, i.e., switch between open and closed positions, under the constraint and support of the elastic swing arm 243, without significant tilting or eccentricity, thereby ensuring the reliability and sealing of the valve action. Since in different embodiments, there can be one or more through holes 221, the shape of the elastic valve plate 242 does not need to be specifically limited, as long as it can cover all the through holes 221. In a preferred embodiment, the through holes 221 are circular holes and the elastic valve plate 242 is a circular plate whose bottom can cover the through holes 221.

[0053] To further enhance the sealing reliability of the telescopic one-way valve 24 when closed, in a further embodiment, a corresponding structure can be provided on the inner edge of the end cap 22 at the through hole 221. Specifically, this inner edge, facing the direction of the paste discharge assembly 23 (i.e., upward), is curved or integrally formed with a raised annular structure, thereby forming an abutment surface specifically designed to cooperate with the elastic valve plate 242. When the pressure in the preparatory discharge chamber 14 increases, the elastic valve plate 242 is pressed downward, and its bottom surface tightly fits against this abutment surface, thereby sealing the through hole 221.

[0054] Furthermore, in order to achieve better airtightness, a sealing groove 223 can be provided on the abutting surface formed by the end cover 22, and at the same time, a matching sealing protrusion 244 is provided at the corresponding position of the elastic valve plate 242. When the valve is closed, the sealing protrusion 244 can be accurately embedded in the sealing groove 223. This convex-concave structure forms a curved sealing path, which greatly increases the resistance to the backflow of the paste and improves the contact pressure per unit area, thereby achieving a highly reliable surface sealing effect. For example, the sealing groove 223 can be one or more annular grooves with a V-shaped or U-shaped cross-section concentrically arranged on the abutting surface. Correspondingly, on the bottom surface of the elastic valve plate 242, an annular sealing protrusion 244 is integrally formed that completely matches the sealing groove 223 in shape, size and position.

[0055] The elastic bowl 21 is used in the pumping unit 2 to realize power conversion and volume change. Figure 4 and Figure 5The lower half of the elastic bowl body 21 is in the shape of a bowl with an opening facing downward, while its top is narrowed into a tubular structure with a smaller diameter and is sleeved onto the paste inlet of the paste dispensing assembly 23. In a specific embodiment, the elastic bowl body 21 can be integrally injection-molded from a material such as thermoplastic elastomer (TPE) or silicone, or other materials that have sufficient elasticity and deformation recovery capabilities and are food-grade safe.

[0056] To ensure a firm and sealed connection between the elastic bowl body 21 and the tube body 1, specifically, refer to Figure 3 or Figure 4 Above the first retaining ring 12, the tubular body 1 protrudes toward the interior of the tubular body 1 and bends toward the first retaining ring 12, thereby forming an annular first insertion gap 13 on the inner wall of the tubular body 1. The opening of the first insertion gap 13 faces the end cap 22. Accordingly, a ridge 211 is integrally formed upwardly on the outermost edge of the elastic bowl 21, matching the first insertion gap 13. During assembly, the upper end of the ridge 211 of the elastic bowl 21 is embedded and retained within the first insertion gap 13 of the tubular body 1, while the lower end of the ridge 211 tightly presses against the top edge of the lower end cap 22. This structure not only firmly secures the elastic bowl 21 to the tubular body 1, preventing axial or radial movement, but also, by clamping the end cap 22 between the elastic bowl 21 and the first retaining ring 12, further enhances the structural stability and sealing of the entire pumping unit 2 head. For example, the first insertion gap 13 can be an annular groove with an undercut structure. Accordingly, the convex edge 211 of the outer edge of the elastic bowl body 21 can be designed to have a hook shape that matches the undercut structure, so that once engaged, a firm and anti-slip snap-fit ​​fixation can be formed. It should be noted that in different embodiments, the position of the inner protrusion of the inner wall of the tube body forming the first insertion gap 13 is not fixed, such as Figure 3 and Figure 4 It can be set up and down as needed during design, as long as it can cooperate with the elastic bowl body 21 so that the elastic bowl body 21 can push the paste-dispensing component 23 upward to make the components in the paste-dispensing component 23 fit tightly.

[0057] When the elastic bowl 21 is at rest, it maintains its natural shape, allowing the pre-discharge cavity 14 below it to maintain its maximum volume. When the user presses the cream dispensing assembly 23, the external force is transmitted to the elastic bowl 21 through the cream dispensing assembly 23, causing the bowl-shaped lower half to be compressed downward and inward, like a depressed diaphragm. This action reduces the volume of the pre-discharge cavity 14, thereby pressurizing the cream inside and pumping it out.

[0058] In certain embodiments, the clamping stopper 234 follows the elastic bowl 21 in its downward movement, and the elastic valve plate 242 moves upward under the pressure of the flowing paste. Furthermore, the lower end of the clamping stopper 234 is disposed relative to the elastic valve plate 242. Therefore, the relative movement of the clamping stopper 234 and the elastic valve plate 242 continues until the clamping stopper 234 abuts against the elastic valve plate 242, blocking the paste discharge passage 2321. This allows for a single, quantitative extrusion of the paste. When the external force is removed, the elastic bowl 21 rapidly rebounds to its original, natural shape due to the material's inherent elastic restoring force. This rebound action increases the volume of the preparatory discharge chamber 14, thereby generating negative pressure within the chamber and automatically drawing the next dose of paste from the storage chamber 15.

[0059] Reference Figure 4 and Figure 5 The paste discharge assembly 23 is mounted on the elastic bowl 21 and operates in conjunction with the elastic bowl 21. The paste discharge assembly 23 has a through-hole discharge channel 2321 for guiding the flow of the paste. The discharge channel 2321 is connected to the preparatory discharge chamber 14. By applying pressure to the paste discharge assembly 23, it can drive the elastic bowl 21 to undergo controlled compression deformation, thereby completing the pumping of the paste.

[0060] In a specific embodiment, the paste dispensing assembly 23 can be composed of multiple components, including a cover 231, a paste dispensing nozzle 232, a pressing member 233, and a snap-on limiter 234. The cover 231 is the outer shell of the paste dispensing assembly 23, providing support, guidance, and protection for the internal movable components. For example, the cover 231 can be a hollow, hood-shaped component with a specific shape, the lower edge of which is connected to the top of the tube body 1 by means of threads or snaps.

[0061] The pressing member 233 is the part to which the user directly applies force, and is provided with a pressing portion for easy finger pressing. Inside the pressing member 233, a support shaft 2331 is extended in a general direction perpendicular to the pressing force. The middle part of the support shaft 2331 is connected to the paste outlet nozzle 232 by an axis connection, and the end of the support shaft 2331 extending outward is abutted or pivoted to the inner wall of the cover body 231. For example, the support shaft 2331 below the pressing member 233 is an integrally formed square crossbar, and the end of the crossbar extending outward is in sliding contact with the cover body 231 to form a simple lever structure, which enables the pressing member 233 to have a complex action stroke. When the user initially presses the pressing portion, the pressing member 233 will first rotate with the middle part of the support shaft 2331 connected to the paste outlet nozzle 232 as the fulcrum. This rotation causes the baffle at its front end to move upward or sideways, thereby exposing the paste outlet of the paste nozzle 232 and completing the opening step. As the pressing stroke continues, the outwardly extending end of the support shaft 2331 becomes a new force transmission fulcrum under the support and reaction force of the inner wall of the cover body 231. At this time, the entire pressing member 233 drives the paste outlet nozzle 232 connected to it to perform a linear downward movement toward the elastic bowl body 21 until the paste is pumped out.

[0062] A paste outlet channel 2321 is formed inside the paste outlet nozzle 232, and the two ends of the channel are respectively a paste inlet connected to the pre-discharge cavity 14 and a paste outlet connected to the outside. The top of the elastic bowl body 21 is elastically sleeved on the outer wall of the paste inlet of the paste outlet nozzle 232, so that the paste inlet is connected to the pre-discharge cavity 14 inside the elastic bowl body 21. In order to achieve a stable installation of the paste outlet one-way valve 25, at least two steps are formed on the side wall of the paste outlet channel 2321 near the paste inlet in the paste outlet nozzle 232. The paste outlet one-way valve 25 is installed in the paste outlet channel 2321, and the edge of its bottom protrudes outward and rests on the first step. The first step serves as an annular bearing surface, providing precise axial positioning for the paste outlet one-way valve 25. Subsequently, the retaining member 234 is inserted from the paste inlet and fixedly mounted in the paste outlet passage 2321. Its top portion tightly presses the convex edge of the bottom of the paste outlet check valve 25 against the first step, thereby securing the paste outlet check valve 25. The bottom edge of the retaining member 234 also convexly abuts the second step, and the outer wall of the retaining member 234 engages with the inner wall of the paste outlet passage 2321. In a preferred embodiment, the retaining member 234 can be a tubular object with radial elasticity in the middle of its outer wall or a tubular object with an interference fit outer diameter in the middle of its outer wall. After being pressed into the paste outlet passage 2321, the middle portion of the outer wall of the retaining member 234 tightly mates or engages with the inner wall of the paste outlet passage 2321, thereby securely locking the paste outlet check valve 25 in its operating position.

[0063] The paste discharge one-way valve 25 is arranged at the end of the paste discharge channel 2321. It is used to open when the preparatory discharge chamber 14 is compressed and the internal pressure increases to allow the paste to be pumped out in one direction, and close immediately after the pressure disappears to prevent external contaminants from entering and the paste from shrinking.

[0064] Reference Figure 8 In one embodiment, the one-way valve 25 has a normally closed dispensing end 251 that faces outward during use, an open joint end 252 for installation and positioning, and a neck 253 connecting the dispensing end 251 and the joint end 252. A notch 254 that can be opened by the pressure of the ointment is provided in the center of the dispensing end 251. In a preferred embodiment, the one-way valve 25 is integrally molded from medical-grade silicone or other elastomeric materials with good elasticity and chemical stability. Its overall appearance is similar to a miniature, hollow bottle stopper with a closed head.

[0065] The incision 254 is composed of a plurality of grooves extending from the center point of the paste outlet end 251 to the periphery. These grooves fit together in a natural state due to the elasticity of the material itself, so that the paste outlet end 251 remains in a reliably closed state. In different embodiments, the number of grooves can be four to eight, and they are evenly arranged around the center point of the incision 254 to ensure that a symmetrical outlet can be formed when opened, so that the paste can flow out evenly. The structure of the incision 254 utilizes the recovery characteristics of the elastic material. When the internal paste pressure increases, the pressure will push the valve body part separated by the groove outward to form an outlet channel for the paste; and once the internal pressure disappears, the elastic recovery force of the material will immediately cause the stretched parts to return to their original position, so that the incision 254 is tightly closed again.

[0066] These grooves divide the paste outlet 251 into a number of deformable, reversible valves 255. Each valve 255 is a reversible, three-dimensional elastic sheet structure surrounded by grooves. In the unpressurized, static state, the edges of all valves 255 fit tightly together, forming a sealed structure. During the paste pump press, when upward positive pressure is generated in the preparatory discharge chamber 14, this pressure acts on the inner surface of the valve 255, causing it to flip outward and open, forming an opening similar to a polygonal star, allowing the paste to flow smoothly out of the grooves.

[0067] In a preferred embodiment, the incision 254 may comprise two mutually perpendicular grooves that intersect at the center of the paste outlet 251. This cross-shaped groove divides the paste outlet 251 into four functionally identical valve units 255. To further optimize sealing and opening performance, the central region of each valve unit 255, away from the intersection of the grooves, may form a recessed portion with the adjacent portion of the neck 253, facing the interior of the neck 253. This recessed portion forms triangular arcuate segments on either side.

[0068] In addition, to ensure the stable positioning of the one-way valve 25 in the paste outlet nozzle 232, the outer periphery of the joint end 252 can be extended outward to form an annular flange 256. During assembly, the flange 256 abuts against the first step on the inner wall of the paste outlet channel 2321, thereby completing the axial positioning.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A paste pump, characterized in that: include: tube body(1); A one-way airtight unit (3) is provided at the lower end of the tube body (1), is in sealing engagement with the inner wall of the tube body (1), and is configured to be able to slide one-way along the inner wall of the tube body (1) toward the upper end; A pumping unit (2) is provided at the upper end of the tube body (1); the pumping unit (2), the tube body (1) and the one-way airtight unit (3) jointly define a storage cavity (15) for storing the paste; Wherein, the pumping unit (2) comprises: An elastic bowl body (21), the edge of which is fixedly connected to the inner wall of the tube body (1); An end cover (22) is disposed below the elastic bowl body (21), a pre-discharge cavity (14) is formed between the elastic bowl body (21) and the end cover (22), and a through hole (221) is provided on the end cover (22) for connecting the storage cavity (15) and the pre-discharge cavity (14); a paste discharge assembly (23) mounted on the elastic bowl body (21) and having a paste discharge channel (2321) communicating with the preparatory discharge cavity (14); the paste discharge assembly (23) being configured to cause the elastic bowl body (21) to deform when pressed, thereby compressing the preparatory discharge cavity (14); a telescopic one-way valve (24), arranged at the through hole (221), for opening when the elastic bowl body (21) is reset to allow the paste to flow from the storage cavity (15) into the pre-discharge cavity (14) in one direction, and for closing when the elastic bowl body (21) is deformed by pressure; The paste discharge one-way valve (25) is provided at the end of the paste discharge channel (2321) and is used to open when the preparatory discharge cavity (14) is compressed to allow the paste to be pumped out in one direction.

2. The paste pump according to claim 1, characterized in that A first limiting ring (12) is formed on the side wall of the tube body (1), and the edge of the end cover (22) abuts against the top of the first limiting ring (12). The tube body (1) protrudes toward the inside of the tube body (1) above the first limiting ring (12), and the protrusion bends toward the first limiting ring (12), forming a first insertion gap (13); a convex edge (211) is formed upward on the outer edge of the elastic bowl body (21), and the upper end of the convex edge (211) is embedded in the first insertion gap (13), and the lower end of the convex edge (211) abuts against the top of the edge of the end cover (22).

3. The paste pump according to claim 1, characterized in that A second limiting ring (222) is provided on the end cover (22) around the through hole (221), and the telescopic one-way valve (24) includes a support ring (241), a plurality of elastic rotary arms (243) and the elastic valve plate (242). The support ring (241) is mounted on the end cover (22) and fixed to the second limiting ring (222). One end of the elastic rotary arm (243) is connected to the inner wall of the support ring (241), and the other end is bent and extended toward the outer wall of the elastic valve plate (242) and connected. The plurality of elastic rotary arms (243) are evenly arranged around the center of the elastic valve plate (242).

4. The paste pump according to claim 3, characterized in that The inner edge of the end cover (22) at the through hole (221) is bent toward the paste outlet channel (2321), forming an abutment surface toward the paste outlet channel (2321), and the elastic valve plate (242) abuts against the abutment surface, and a sealing groove (223) is provided on the abutment surface. A sealing protrusion (244) is provided on the elastic valve plate (242), and the sealing protrusion (244) is embedded in the sealing groove (223).

5. The paste pump according to claim 1, characterized in that The paste discharging assembly (23) comprises a cover body (231), a paste discharging nozzle (232), a pressing member (233) and a clamping limit member (234); the pressing member (233) is provided with a pressing portion for receiving a pressing force; the pressing member (233) is provided with a support shaft (2331) extending in a direction perpendicular to the pressing force; the middle portion of the support shaft (2331) is connected to the paste discharging nozzle (232) axis, and the end portion of the support shaft (2331) abuts against the top wall of the cover body (231); The paste outlet channel (2321) is formed in the paste outlet nozzle (232) and has a paste inlet and a paste outlet at both ends, respectively. The side wall of the paste outlet channel (2321) is formed with at least two steps at the paste inlet. The paste outlet one-way valve (25) is installed in the paste outlet channel (2321) and has a flange (256) formed on the bottom edge thereof. The flange (256) abuts against the first step. The clamping limiter (234) is fixedly installed in the paste outlet channel (2321) and abuts the protruding bottom edge of the paste outlet one-way valve (25) against the first step.

6. The paste pump according to claim 5, characterized in that The paste-discharging one-way valve (25) comprises a closed paste-discharging end (251), an open joint end (252), and a neck (253) connecting the paste-discharging end (251) and the joint end (252); a cutout (254) which can be opened by paste pressure is provided in the center of the paste-discharging end (251); the cutout (254) comprises 4 to 8 grooves, which extend outward from the middle of the paste-discharging end (251) and are evenly arranged around the center of the paste-discharging end (251); the clamping limiter The bottom edge of (234) protrudes outward and abuts against the second step, and the outer side wall of the clamping limiter (234) is clamped with the inner side wall of the paste outlet channel (2321); the groove divides the paste outlet end (251) into a plurality of deformable and flippable valves (255); the valves (255) are closed in a static state and form a closed structure; the valves (255) are opened under the action of internal pressure and form a star-shaped opening hole; the valves (255) are flippable three-dimensional elastic sheet structures surrounded by the grooves.

7. The paste pump according to claim 6, characterized in that The incision (254) includes two mutually perpendicular grooves that intersect at the center of the paste outlet end (251) to form a cross-shaped structure, and the two grooves divide the paste outlet end (251) into four valve (255) units; the middle area of ​​the valve (255) unit on the side away from the intersection center of the grooves and the adjacent neck (253) part are recessed toward the inside of the neck (253), so that the two sides of the formed recessed portion form triangular arc surface segments.

8. The paste pump according to claim 5, characterized in that The top end of the elastic bowl body (21) is converged into a tubular shape and extends outwards and is elastically sleeved on the outer side wall of the paste inlet of the paste outlet nozzle (232).

9. The paste pump according to claim 1, characterized in that The one-way airtight unit (3) comprises a piston (31) and a one-way air inlet valve (32). The piston (31) is slidably disposed in the tube body (1) and is sealed with the tube body (1). The piston (31) separates the storage chamber (15) into a medium cavity (311) and a gas cavity (312) which are not connected to each other. The medium cavity (311) is used to accommodate the paste. The one-way air inlet valve (32) is connected to the gas cavity (312) and is used to control the one-way entry of air into the gas cavity (312) and to block air from entering the gas cavity (312). The gas escaping cavity (312) is provided; the piston (31) comprises a plug body (313) and a sealing sleeve (314); the sealing sleeve (314) is sleeved on the circumference of the plug body (313) and is sealed against the inner wall of the accommodating cavity; the sealing sleeve (314) is in the shape of a tube with a concave center; a gap is formed between the sealing sleeve (314) and the plug body (313); the sealing sleeve (314) has elastic deformation characteristics; the upper end and the lower end of the sealing sleeve (314) are in contact with the inner wall of the tube body (1).

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