Pressure pump device of liquid distributor and liquid distributor

Abstract

The utility model relates to a liquid distributor pressure pump device and a liquid distributor, the pressure pump device comprises a pressing part which is used for executing pressing pumping action and abutting against and extruding a pumping module, the pressing part comprises a fluid channel which is used for fluid pumping of the pumping module, a back suction part is arranged on the pressing stroke of the pressing part, and the back suction part comprises a flexible cavity; the flexible cavity is used for expanding after being compressed to form a negative pressure cavity to suck back the pumped liquid; the liquid distributor comprises a container and a connection sealing cover, the connection sealing cover is used for installing a pressing pump, a fluid output terminal is provided with a nozzle, the nozzle comprises an extension part, and the tail end of the extension part is obliquely arranged, so that the spraying direction or the fluid dripping direction is far away from the container.

Description

Technical Field

[0001] This utility model belongs to the field of medical device drug delivery device technology, specifically relating to a body dispenser pump device and a liquid dispenser. Background Technology

[0002] Traditional fluid dispensers (such as syringes, manual pumps, and droppers) typically rely on manual control of fluid flow by the operator, dispensing and stopping the fluid by pushing or releasing pressure. However, when pressure is released, these devices often cause a small amount of fluid to drip from the outlet due to inertia or residual pressure, resulting in drug waste, dosage errors, and even the risk of cross-contamination. This problem is particularly prominent in the handling of corrosive agents, high-value biological agents, or infectious samples, potentially threatening patient safety and increasing medical costs. Utility Model Content

[0003] The purpose of this utility model is to provide a liquid distributor pump device, including a pressing part for performing a pressing pumping action, which abuts against and squeezes the pumping module. The pressing part includes a fluid channel for pumping fluid from the pumping module. A suction part is provided on the pressing stroke of the pressing part. The suction part includes a flexible cavity. The flexible cavity is used to expand after compression to form a negative pressure cavity to suction back the pumped liquid.

[0004] The technical solution provided in this application also has the following technical features:

[0005] Preferably, in one embodiment of this application, the negative pressure chamber of the flexible cavity is connected to the fluid output terminal.

[0006] Preferably, in one embodiment of this application, the negative pressure chamber of the flexible cavity is used to store the pumped return fluid; when the pressing part squeezes the suction part, the stored return fluid in the negative pressure chamber of the flexible cavity is driven to flow to the fluid output terminal.

[0007] Preferably, in one embodiment of this application, the suction portion is disposed on the side of the pressing portion near the pumping module.

[0008] Preferably, in one embodiment of this application, the middle part of the back suction section is sealed with the output port of the pumping module, and the back suction section and the output port of the pumping module are sealed together, and the output port of the pumping module is connected to the negative pressure chamber and the fluid output terminal.

[0009] Preferably, in one embodiment of this application, the channel between the negative pressure chamber of the suction section and the pumping module is a one-way channel, the pumping module is a one-way pumping module, and a check valve structure is provided so that the one-way channel opens when the pumping module is squeezed and closes when the pumping module is released and reset.

[0010] Preferably, in one embodiment of this application, the suction part is disposed on the output port of the pumping module, and the suction part surrounds the output port of the pumping module to form a flexible cavity; during the squeezing stroke of the pressing part, the flexible cavity is compressed and the space is reduced; during the reset stroke of the pressing part, the compressed space of the flexible cavity expands and resets to form a negative pressure cavity.

[0011] Preferably, in one embodiment of this application, the back suction part includes an outer sealing wall, an upper contact wall, and an inner sealing cavity wall;

[0012] The outer sealing wall is a cylindrical thin wall, the inner sealing cavity wall is a cylindrical thin wall, the outer edge of the upper contact wall joint connects to the upper end of the outer sealing wall, and the hollow inner edge of the upper contact wall joint connects to the inner sealing cavity wall.

[0013] The outer sealing wall, the upper contact wall, and the inner sealing cavity wall surround and form an outer cavity that is open on one side. The cavity surrounded by the inner sealing cavity wall is a flexible cavity. The outer cavity and the flexible cavity are elastic, so that they tend to expand when compressed. The outer cavity is connected to the outside air, and the flexible cavity is connected to the fluid output terminal.

[0014] Preferably, in one embodiment of this application, a liquid dispenser includes a container and a connecting sealing cap. The connecting sealing cap is used to install a press pump. A nozzle is provided on the fluid output terminal, and the nozzle includes an extension. The end of the extension is inclined so that the spray direction or the fluid dripping direction is away from the container.

[0015] Preferably, in one embodiment of this application, the nozzle is equipped with a dust cover, the dust cover including a dust chamber and a retaining ring;

[0016] The dust chamber is used to insert the extension of the nozzle. The dust chamber has a ramp at the inlet and an elastic layer on the inner wall.

[0017] Preferably, in one embodiment of this application, the retaining ring includes an open notch, through which it engages with the upper end of the connecting sealing cap.

[0018] Preferably, in one embodiment of this application, the pumping module includes a press pump and a hose; the press pump includes a main column, a secondary column, a piston, a reset component I, a reset component II, a steel ball, and a pumping chamber; the piston of the pumping module is provided with a collar plate, and a cavity is formed between the main column and the collar plate to correspond to the single pumping drip volume.

[0019] Preferably, in one embodiment of this application, a hand-held plate is provided between the dustproof compartment and the retaining ring, and the hand-held plate is used to squeeze and operate the insertion and removal of the dustproof cover.

[0020] Preferably, in one embodiment of this application, the connecting sealing cover includes a screw cap, a gasket, and a sealing element. A sealing element is provided between the sealing connecting cover and the pump pressure chamber, and the sealing element is used to fix the pump pressure chamber. A gasket is provided between the sealing element and the container.

[0021] Preferably, in one embodiment of this application, the output port of the main column is connected to the suction section; a secondary column is concentrically arranged inside the main column, and a piston is arranged at the lower part of the main column and the secondary column, and the piston is placed in the pump chamber; the end of the secondary column extends out of the main column and the piston; a reset member I is arranged between the main column and the piston; a reset member II is arranged between the end limit of the secondary column and the pump chamber; a flexible hose is connected to the inlet of the pump chamber, and a steel ball is arranged at the connection to form a one-way flow channel.

[0022] Preferably, in one embodiment of this application, the negative pressure back suction volume of the back suction section can be designed according to the working conditions, so that after a single pumping, the negative pressure back suction volume of the back suction section can be used for multiple liquid transfers.

[0023] Preferably, in one embodiment of this application, the reset member I and the reset member II are springs.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0025] The technical solution of this application sets a back-suction section between the pressing part and the pump, and uses its cavity to form a negative pressure when released, thereby effectively back-suctioning residual liquid at the drug delivery port and avoiding drug leakage. This structural design achieves automatic back-suction without affecting the normal pumping function, improving drug delivery accuracy, preventing dosage deviation and cross-contamination. It is especially suitable for dispensing high-value or high-risk liquids, such as biological agents, corrosive agents and infectious sample processing, significantly improving drug safety and system hygiene, while reducing drug waste and subsequent processing costs. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This utility model relates to a three-dimensional liquid dispenser. Figure 1 ;

[0028] Figure 2 This utility model relates to a three-dimensional liquid dispenser. Figure 2 ;

[0029] Figure 3 This utility model relates to a three-dimensional method for removing the dust cover of a liquid dispenser. Figure 1 ;

[0030] Figure 4 This utility model relates to a three-dimensional method for removing the dust cover of a liquid dispenser. Figure 2 ;

[0031] Figure 5 This is a front view of a liquid dispenser according to the present invention;

[0032] Figure 6 This is a top view of a liquid dispenser according to the present invention;

[0033] Figure 7 for Figure 5 AA section view;

[0034] Figure 8 for Figure 6 BB cross-sectional view;

[0035] Figure 9 for Figure 8 Color view;

[0036] Figure 10 This is a schematic diagram of the liquid channel flow direction of a liquid distributor according to the present invention;

[0037] Figure 11 This is a schematic diagram illustrating the pumping working principle of a liquid distributor according to this utility model;

[0038] Components in the diagram:

[0039] 1. Nozzle

[0040] 2. Dust cover

[0041] 3. Back suction section

[0042] 4. Sprayer head

[0043] 5. Screw cap

[0044] 6. Gaskets

[0045] 7. Press the pump

[0046] 8. Container

[0047] 9. Main Column

[0048] 10. Secondary column

[0049] 11. Receipt

[0050] 12. Reset component I

[0051] 13. Piston

[0052] 15. Reset component II

[0053] 16. Steel balls

[0054] 17. Pump pressure chamber

[0055] 18. Hose. Detailed Implementation

[0056] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings. These embodiments are only for illustrating this application and are not intended to limit the scope of this utility model.

[0057] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0060] like Figure 1-11 A liquid distributor pump device includes a pressing part for performing a pressing pumping action, which abuts against a squeezing pumping module. The pressing part includes a fluid channel for pumping fluid from the pumping module. A suction part is provided on the pressing stroke of the pressing part. The suction part includes a flexible cavity. The flexible cavity is used to expand after compression to form a negative pressure cavity to suction back the pumped liquid.

[0061] The suction section can plastically rebound;

[0062] When implementing this application, the key points are as follows:

[0063] Pressing section: Used for manual or automatic force application to compress the pumping module and drive fluid output; the pressing section is provided with a fluid channel to guide the liquid in the pumping module to the drug delivery port;

[0064] Pumping module: Used to store and pump liquid into the pressing section channel when pressurized. Common medicine pumps, such as dual piston press pumps, can be used.

[0065] The suction section is located on the travel path of the pressing section and includes a flexible cavity that is compressed during pressing and automatically rebounds after the pressing force is released, forming a negative pressure.

[0066] Fluid channel: The cavity of the flexible chamber is connected to the drug delivery port, so that the residual liquid at the delivery port can be effectively drawn back when the pressure is released; during pumping, the pumped liquid will also be delivered.

[0067] The working principle or process of this application is as follows:

[0068] 1. Pressurization stage: The user or device applies force to the pressing part, which squeezes the pumping module, and the liquid is pumped along the fluid channel to the drug delivery port to complete one drug delivery;

[0069] 2. Back suction control: During the pressurization process, the flexible cavity of the back suction section is compressed synchronously, but this does not hinder the normal pumping of liquid;

[0070] 3. Release phase: After releasing the pressing part, the flexible cavity expands rapidly due to the recovery of elasticity, forming a local negative pressure;

[0071] 4. Residual liquid back suction: The negative pressure acts on the drug delivery port through the channel to draw the residual liquid at the nozzle or outlet back into the flexible cavity to prevent dripping;

[0072] By integrating the back suction function into a simple structure, the system can automatically back suction the residual liquid after pumping without the need for a complex valve control mechanism. This effectively solves the problems of dripping, contamination, and dosage error that exist in traditional equipment, and is suitable for fluid distribution scenarios with high safety and high precision requirements.

[0073] Specifically, in one embodiment of this application, the negative pressure chamber of the flexible cavity is connected to the fluid output terminal. In order to achieve liquid back suction or recycling at a certain location, negative pressure back suction can be used by connecting to this location.

[0074] Specifically, in one embodiment of this application, the negative pressure chamber of the flexible cavity is used to store the pumped return fluid; when the pressing part squeezes the suction part, the stored return fluid in the negative pressure chamber of the flexible cavity is driven to flow to the fluid output terminal;

[0075] In this embodiment, in addition to considering the use of the structure for back suction, it is also considered to use the structure for temporary storage of some fluid. When pumping pressure again, only the temporary storage of some fluid using this structure is needed to meet the usage requirements, without the need to repeatedly pump the liquid in the container, thus avoiding contamination and ensuring full utilization of the pumped liquid.

[0076] Specifically, in one embodiment of this application, the suction portion is disposed on the side of the pressing portion near the pumping module, so that it can be pressed and squeezed before the pumping module.

[0077] Specifically, in one embodiment of this application, the middle part of the back suction section is sealed with the output port of the pumping module, and the back suction section and the output port of the pumping module are sealed together. The output port of the pumping module is connected to the negative pressure chamber and the fluid output terminal.

[0078] This embodiment demonstrates how to achieve a connecting channel, namely, by placing the negative pressure chamber of the back suction section between the pumping module and the fluid output terminal, thereby functioning as a pumping channel and enabling back suction after pumping.

[0079] Specifically, in one embodiment of this application, the channel between the negative pressure chamber of the back suction section and the pumping module is a one-way channel. The pumping module pumps in one direction and is equipped with a check structure, so that the one-way channel opens when the pumping module is squeezed and closes when the pumping module is released and resets, so as to avoid the negative pressure of the negative pressure chamber of the back suction section being destroyed, avoid the failure of negative pressure, and enable the negative pressure to effectively achieve back suction to the fluid output terminal, so as to make the fluid flow back.

[0080] Specifically, in one embodiment of this application, the suction part is disposed on the output port of the pumping module, and the suction part surrounds the output port of the pumping module to form a flexible cavity; during the squeezing stroke of the pressing part, the flexible cavity is compressed and the space is reduced; during the reset stroke of the pressing part, the compressed space of the flexible cavity expands and resets to form a negative pressure cavity.

[0081] This embodiment provides one implementation method, which can also be implemented in other forms, such as airbag type, liquid reservoir type, or spring piston type back suction; the following are descriptions of each:

[0082] Airbag type, which utilizes the expansion of compression deformation, such as an airbag channel, where the channel is in the middle of the airbag. When the airbag is compressed, the channel in the middle of the airbag becomes smaller, and when it is restored and expanded, the channel expands, achieving negative pressure back suction.

[0083] The reservoir type utilizes the compression and repositioning of the reservoir to create negative pressure, allowing the reservoir to directly draw back the pumped liquid, thus creating a return flow of residual liquid at the end.

[0084] A reset piston rod, such as a spring piston rod, when pressed, the pressing part squeezes the piston rod and the spring, moving them within the cavity and reducing the space where the piston is located. This cavity is always connected to the fluid output terminal and the output port of the pumping module. Continuous squeezing causes the pumping module to be pressed, thus completing the pumping action.

[0085] During reset, after the pumping module resets, the piston rod resets under the action of the spring, and the previously compressed cavity expands to form a negative pressure space; thus completing the negative pressure return action.

[0086] Specifically, in one embodiment of this application, the back suction part includes an outer sealing wall, an upper contact wall, and an inner sealing cavity wall;

[0087] The outer sealing wall is a cylindrical thin wall, the inner sealing cavity wall is a cylindrical thin wall, the outer edge of the upper contact wall joint connects to the upper end of the outer sealing wall, and the hollow inner edge of the upper contact wall joint connects to the inner sealing cavity wall.

[0088] An outer sealing wall, an upper contact wall, and an inner sealing cavity wall surround and form an outer cavity that is open on one side. The cavity surrounded by the inner sealing cavity wall is a flexible cavity. The outer cavity and the flexible cavity are elastic, so that they tend to expand when compressed. The outer cavity is connected to the outside air, and the flexible cavity is connected to the fluid output terminal.

[0089] The process is completed by one-piece injection molding, which reduces the cost of production, implementation, and assembly, requires minimal modification, and can make full use of existing bottle bodies, pumps, and other related components, giving the technical solution of this application good versatility.

[0090] Specifically, in one embodiment of this application, a liquid dispenser includes a container 8 and a connecting sealing cap. The connecting sealing cap is used to install a press pump 7. A nozzle 1 is provided on the fluid output terminal, and the nozzle 1 includes an extension. The end of the extension is inclined so that the spray direction or the fluid dripping direction is away from the container.

[0091] Specifically, in one embodiment of this application, the nozzle 1 is equipped with a dust cover 2, which includes a dust chamber and a retaining ring;

[0092] The dust chamber is used to insert the extension of the nozzle 1. The inlet of the dust chamber is provided with a ramp, and the inner wall of the dust chamber is provided with an elastic layer.

[0093] Specifically, in one embodiment of this application, the retaining ring includes an open notch through which it engages with the upper end of the connecting sealing cap.

[0094] Specifically, in one embodiment of this application, the pumping module includes a press pump 7 and a hose 18; the press pump 7 includes a main column 9, a secondary column 10, a piston 13, a reset member I 12, a reset member II 15, a steel ball 16, and a pumping chamber 17; the piston 13 of the pumping module is provided with a collar plate 11, and a cavity is formed between the main column 9 and the collar plate 11 corresponding to the single pumping drip volume.

[0095] Specifically, in one embodiment of this application, a hand-held plate is provided between the dustproof chamber and the retaining ring, and the hand-held plate is used to squeeze and operate the insertion and removal of the dustproof cover 2.

[0096] Specifically, in one embodiment of this application, the connecting sealing cover includes a screw cover 5, a gasket 6, and a sealing element. The sealing element is provided between the screw cover 5 and the pump pressure chamber 17, and the sealing element is used to fix the pump pressure chamber 17; the gasket 6 is provided between the sealing element and the container 8.

[0097] Specifically, in one embodiment of this application, the output port of the main column 9 is connected to the suction section 3; a secondary column 10 is concentrically arranged inside the main column 9, and a piston 13 is arranged at the lower part of the main column 9 and the secondary column 10, and the piston 13 is placed in the pump chamber 17; the end of the secondary column 10 extends out of the main column 9 and the piston 13; a reset member I 12 is arranged between the main column 9 and the piston 13; a reset member II 15 is arranged between the end limit of the secondary column 10 and the pump chamber 17; a flexible hose 18 is connected to the inlet of the pump chamber 17, and a steel ball 16 is arranged at the connection to form a one-way flow channel.

[0098] Specifically, in one embodiment of this application, such as Figure 10-11 The pumping process is as follows:

[0099] Initial pumping: The main column 9 and the auxiliary column 10 overcome the resistance of the reset component II 15 and drive the piston 13 to press down through the reset component I 12. After the piston 13 is limited by the lower end limit part of the pumping chamber 17, the main column 9 and the auxiliary column 10 continue to move downward over the resistance of the reset component I 12 and the reset component II 15. The lower end of the auxiliary column 10 moves away from the piston 13, and the pumping channel opens to form exhaust.

[0100] The pumping channel includes the gap space between the auxiliary column 10 and the main column 9, and the upper cavity space of the main column 9;

[0101] If the pressure in the compression chamber is sufficient to prevent the piston 13 from moving downward, the lower end of the auxiliary column 10 will move away from the piston 13 in advance, and the pumping channel will open earlier to complete the exhaust. After repeated pumping, when the compression chamber of the pumping chamber 17 is filled with liquid, the pumping channel will open earlier to pump the liquid because the liquid is incompressible.

[0102] When the reset is released, under the reset force of reset component II 15 and reset component I 12, the lower end of the auxiliary column 10 is close to the piston 13 to form a seal, the main column 9, auxiliary column 10 and piston 13 move upward together, the compression chamber of the pump pressure chamber 17 forms a negative pressure, the one-way valve of the steel ball 16 opens, the liquid in the container 8 is attracted by the negative pressure and enters the compression chamber of the pump pressure chamber 17 through the hose 18;

[0103] When the pump is repeatedly pressed and released to reset, the liquid fills the compression chamber. If the chamber is not full, the liquid is incompressible. When the pump is pressed again, the piston 13 may be limited by the lower end of the pump chamber 17, or the piston 13 may not be able to move down because the liquid is incompressible. The lower end of the auxiliary column 10 moves away from the piston 13, the pumping channel opens, and the liquid enters the negative pressure chamber of the suction section 3 under pressure, thus completing the pumping of liquid.

[0104] When the liquid is released and reset, the negative pressure chamber of the suction section 3 is compressed during the press pumping, so the chamber becomes larger during reset, forming a negative pressure trend and allowing more liquid to enter. Therefore, the liquid in the extension of the nozzle 1 and the exposed port is drawn back into the negative pressure chamber of the suction section 3.

[0105] Moreover, during pumping, since the back suction section 3 is compressed and pumped before the press pump 7, the liquid that was previously back suctioned in the negative pressure chamber of the back suction section 3 is first compressed into the pipe of the extension section of the nozzle 1.

[0106] The negative pressure back suction volume of the back suction section 3 can be designed according to the working conditions, so that after a single pumping, the negative pressure back suction volume of the back suction section 3 can be used for multiple liquid transfers.

[0107] Specifically, in one embodiment of this application, the reset member I12 and the reset member II15 are springs.

[0108] Specifically, in one embodiment of this application, a simple and highly reliable dispensing device is provided that can actively back-suction residual liquid at the outlet when dispensing stops, while also considering ease of operation and cost control in medical scenarios. Addressing this technological gap, this invention proposes a liquid dispenser with a back-suction function. Through an innovative fluid control mechanism, it effectively solves the dripping problem of traditional equipment and adapts to the application needs of diverse medical scenarios. The technical solution is as follows: it comprises a nozzle, a backflow valve, a dust cover, a spray head, a pumping module, a sealing connector, a gasket, and a bottle body. The fluid control mechanism primarily relies on the air pressure generated by the deformation of the anti-drip backflow valve to back-suction liquid, thereby solving the dripping problem.

[0109] 1. Pull the dust cover out towards the nozzle;

[0110] 2. Press the nozzle about five times to fill with water before administering the medication.

[0111] 3. After use, align the dust cover hole with the nozzle and insert it.

[0112] Components in brief:

[0113] 1. Nozzle: Administers medication in the form of water droplets;

[0114] 2. The backflow section includes a backflow valve structure: when the drug administration is completed, the drug droplet is drawn back into the nozzle;

[0115] 3. Dust cover: Protects the nozzle from foreign objects and prevents dripping;

[0116] 4. Nozzle: Dosing activation button;

[0117] 5. Main column: Press transmission rod and liquid outlet channel;

[0118] 6. Secondary column: Dosing control valve;

[0119] 7. Delivery of cards: Control of the amount dispensed per drop;

[0120] 8. Gasket: Used to seal the liquid inside the bottle;

[0121] 9. Reset component I is a short spring: assists the drug delivery switch valve to prevent the drug solution from returning to the bottle;

[0122] 10. Piston: Pressure differential regulation, water supply power;

[0123] 11. The sealing cap is a screw cap: to secure the bottle;

[0124] 12. Reset component II is a long spring: used for auxiliary drug delivery switch valve, water supply, pump, and head return;

[0125] 13. Steel balls: Used to seal the liquid inside the pump;

[0126] 14. Pump chamber: Stores the incoming water liquid;

[0127] 15. Tube: Used to draw up the medication;

[0128] 16. The container is a bottle: for storing liquid medicine;

[0129] 1. Working principle of liquid back suction: When the nozzle is pressed down, the backflow valve deforms. When the medication is finished, the nozzle rebounds and drives the backflow valve to plastically rebound. During the plastic rebound, the pressure inside the cavity increases, causing the water droplets at the nozzle to flow back.

[0130] 2. Working principle of drug dispensing: When the nozzle is pressed down, it drives the main column, auxiliary column, and piston to press down together. When the piston is pressed down to the limit, the main column and auxiliary column continue to press down to open the drug delivery channel. The increased pressure will cause the drug in the body to flow out from the opened channel for drug delivery. The dose is when the piston is pressed down to the limit platform.

[0131] In summary, this invention aims to solve the problems of residual liquid leakage, inaccurate dosage, and potential cross-contamination in traditional liquid dispensing devices, especially in high-risk or high-value liquid handling scenarios, where residual liquid at the outlet often leads to drug waste and high usage risks. By incorporating a back-suction section between the pressing part and the pump, the back-suction section features a flexible cavity. During the pressing and pumping process, it is passively compressed without affecting normal pumping. Upon release, it automatically expands to create negative pressure, drawing back the residual liquid at the outlet. This achieves an automatic back-suction function without additional operation, effectively improving the safety, accuracy, and ease of use of liquid dispensing.

[0132] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A liquid distributor pump device, comprising a pressing part for performing a pressing pumping action, abutting against a squeezing pumping module, the pressing part including a fluid channel for fluid pumping by the pumping module, characterized in that, The pressing part is equipped with a suction part, which includes a flexible cavity. The flexible cavity is used to expand after compression to form a negative pressure cavity to suction back the pumped liquid.

2. The liquid distributor pump device as described in claim 1, characterized in that, The negative pressure chamber of the flexible cavity is connected to the fluid output terminal; the negative pressure chamber of the flexible cavity is used to store the pumped return fluid; When the pressing part squeezes the suction part, the stored reflux fluid in the negative pressure chamber of the flexible cavity is driven to flow to the fluid output terminal.

3. The liquid distributor pump device as described in claim 1, characterized in that, The suction section is located on the side of the pressing section near the pumping module; the middle of the suction section is sealed and embedded with the output port of the pumping module, and the suction section and the output port of the pumping module are sealed together. The output port of the pumping module is connected to the negative pressure chamber and the fluid output terminal.

4. The liquid distributor pump device as described in claim 1, characterized in that, The channel between the negative pressure chamber of the suction section and the pumping module is a one-way channel. The pumping module pumps in one direction and is equipped with a check valve structure, so that the one-way channel opens when the pumping module is squeezed and closes when the pumping module is released and reset.

5. A liquid distributor pump device as described in claim 1, characterized in that, The suction section is located at the output port of the pumping module, and the suction section surrounds the output port of the pumping module to form a flexible cavity; during the pressing stroke of the pressing section, the flexible cavity is compressed and the space is reduced; during the resetting stroke of the pressing section, the compressed space of the flexible cavity expands and resets to form a negative pressure cavity.

6. The liquid distributor pump device as described in claim 1, characterized in that, The back suction section includes an outer sealing wall, an upper contact wall, and an inner sealing cavity wall; The outer sealing wall is a cylindrical thin wall, the inner sealing cavity wall is a cylindrical thin wall, the outer edge of the upper contact wall joint connects to the upper end of the outer sealing wall, and the hollow inner edge of the upper contact wall joint connects to the inner sealing cavity wall. The outer sealing wall, the upper contact wall, and the inner sealing cavity wall surround and form an outer cavity that is open on one side. The cavity surrounded by the inner sealing cavity wall is a flexible cavity. The outer cavity and the flexible cavity are elastic, so that they tend to expand when compressed. The outer cavity is connected to the outside air, and the flexible cavity is connected to the fluid output terminal.

7. A liquid dispenser, employing a liquid dispenser pump device according to any one of claims 1-6, comprising a container (8) and a connecting sealing cover, the connecting sealing cover being used to install a press pump (7), characterized in that, A nozzle (1) is provided on the fluid output terminal, and the nozzle (1) includes an extension, the end of which is inclined so that the spray direction or the fluid dripping direction is away from the container.

8. A liquid dispenser as described in claim 7, characterized in that, The nozzle (1) is equipped with a dust cover (2), which includes a dust chamber and a retaining ring. The dust chamber is used to insert into the extension of the nozzle (1). The inlet of the dust chamber is provided with a ramp, and the inner wall of the dust chamber is provided with an elastic layer.

9. A liquid dispenser as described in claim 8, characterized in that, The retaining ring includes an open notch through which it is inserted into the upper end of the connecting sealing cover; a hand-held plate is provided between the dust chamber and the retaining ring, and the hand-held plate is used to squeeze and operate the insertion and removal of the dust cover (2).

10. A liquid dispenser as described in claim 7, characterized in that, The pumping module includes a press pump (7) and a hose (18); the press pump (7) includes a main column (9), a secondary column (10), a piston (13), a reset component I (12), a reset component II (15), a steel ball (16), and a pumping chamber (17); the piston (13) of the pumping module is provided with a collar plate (11), and a cavity is formed between the main column (9) and the collar plate (11) to correspond to the single pumping drip volume.

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