Pinching pump

Abstract

The utility model relates to the field of containers, and particularly discloses a pinching pump which comprises a container body and a piston, a containing cavity is formed in the container body, the piston is arranged in the containing cavity in a sliding mode and is in sealing fit with the container body, the containing cavity is divided into a medium cavity and a gas cavity by the piston, and the medium cavity and the gas cavity are not communicated with each other. The medium cavity is used for containing a paste medium and is communicated with a paste outlet, the gas cavity is communicated with a one-way gas inlet valve, the container body has an elastic deformation characteristic, the paste medium is always kept in the medium cavity, and the paste medium can be extruded out by extruding any position of the container body. The device has the advantages of being simple and stable in structure and convenient to use.

Description

Technical Field

[0001] The present application relates to the field of containers, and in particular to a pinch pump. Background Art

[0002] As people's living standards improve, people's demand for daily care products such as toothpaste, hand cream, sunscreen and ointment is also gradually increasing. The aforementioned products are mostly semi-solid liquids, often called paste media or pastes, etc. At present, paste media are generally packaged in a hose, with a paste outlet at one end and a fishtail-shaped packaging structure at the other end. The hose is deformed by squeezing the hose, and the paste medium is squeezed out from the paste outlet for use.

[0003] After the paste medium is reduced, if the hose is squeezed with one hand, the paste will run around in the tube. Usually, both hands are needed to squeeze the paste medium near the tail end of the hose to a position near the paste outlet, which is inconvenient to use. Moreover, as the paste medium gradually decreases during daily use, it will become more and more troublesome to squeeze out the remaining paste medium. Utility Model Content

[0004] In order to improve the convenience of squeezing the paste medium out of the container, the present application provides a pinch pump, which can extrude the paste medium with one hand, and the paste medium will not run around in the container. It has the advantages of easy use, simple structure and low cost.

[0005] The present application provides a kneading pump adopting the following technical solution:

[0006] A pinch pump, comprising:

[0007] The container body has elastic deformation characteristics and has an accommodating cavity formed inside;

[0008] A piston is slidably disposed in the accommodating cavity and is sealed with the container body, wherein the piston separates the accommodating cavity into a medium cavity and a gas cavity which are not connected to each other, and the medium cavity is used to accommodate the paste medium;

[0009] A paste outlet pipe connected to the medium cavity;

[0010] The one-way air inlet valve is connected to the gas cavity, controls the one-way air to enter the gas cavity, and blocks the air from escaping the gas cavity.

[0011] By adopting the above technical solution, the paste medium can be extruded from the paste outlet regardless of whether the extrusion container body is located in the medium cavity or the gas cavity. At the same time, the piston slides correspondingly in the accommodation cavity. As the paste medium decreases, the piston gradually approaches the paste outlet, so that the remaining paste medium always remains in the medium cavity and will not move arbitrarily in the accommodation cavity. Even if the remaining paste medium is small, only one hand is needed to extrude the remaining paste medium, and it can be used as it is extruded. There is no need to use both hands to find the position of the paste in the container, and there is no need to adjust the extrusion method due to the change in the content of the paste medium, which greatly improves the convenience of extruding the paste medium; the paste medium located in the paste outlet pipe can form a certain degree of seal for the paste outlet pipe, preventing air or the extruded paste medium from flowing back into the medium cavity and optimizing the use experience.

[0012] Optionally, the piston as a whole has the characteristic of elastic deformation.

[0013] By adopting the above technical solution, during the deformation of the container body, the piston generates corresponding deformation to ensure the sealing between the piston and the container body, so that even if the user squeezes the position where the piston is located, the paste medium can be normally extruded, further improving the arbitrariness of squeezing the container body and the convenience of use.

[0014] Optionally, the piston includes a plug body and a sealing sleeve. The sealing sleeve is sleeved on the periphery of the plug body and is hermetically fitted to the inner wall of the accommodation cavity. One end of the sealing sleeve is connected to the plug body, and the other end extends in the direction close to the paste outlet.

[0015] By adopting the above technical solution, the sealing sleeve continuously abuts against the inner wall of the accommodation cavity to ensure the sealing of the piston, and sealing sleeves with different extension lengths can be configured according to the characteristics of the paste medium to improve the adaptability of the container.

[0016] Optionally, a gap is formed between the sealing sleeve and the plug body, and the sealing sleeve has the characteristic of elastic deformation.

[0017] By adopting the above technical solution, when the container body deforms under the action of an external force, the sealing sleeve correspondingly deforms under the compression of the container body to maintain the fit with the inner wall of the medium cavity during the deformation and restoration of the container body, avoiding the formation of gaps and improving the sealing effect.

[0018] Optionally, the sealing sleeve gradually expands in the direction close to the paste outlet.

[0019] By adopting the above technical solution, the sealing sleeve has a tendency to expand outwards, so that the sealing sleeve can fit more stably on the inner wall of the accommodation cavity and improve the sealing effect.

[0020] Optionally, the plug body has elastic deformation characteristics. A gas accumulation groove is formed on one side of the gas cavity of the plug body. The opening of the gas accumulation groove faces the gas cavity, and the bottom of the groove is located at the part of the plug body close to the medium cavity.

[0021] By adopting the above technical solution, when the container body is deforming or restoring, due to the existence of the pressure difference, the gas exerts pressure on the inner wall of the gas accumulation groove. On the one hand, it is used to push the piston to move as a whole. On the other hand, it can make the plug body expand outwards to improve the fit degree between the sealing sleeve and the inner wall of the accommodating cavity, further improving the sealing effect and reducing the possibility of leakage of the paste-like medium.

[0022] Optionally, the piston further includes a connecting ring. The connecting ring has elastic deformation characteristics. The connecting ring is of an annular structure. The connecting ring forms two annular connecting ends, an inner annular connecting end and an outer annular connecting end. The annular connecting end located in the inner ring is attached to the plug body, and the annular connecting end located in the outer ring is attached to the sealing sleeve.

[0023] By adopting the above technical solution, the connector provides a certain support and deformation space for the sealing sleeve by virtue of its own elasticity, further improving the deformation ability of the piston as a whole and the sealing effect of the sealing sleeve.

[0024] Optionally, it further includes a one-way medium valve. The one-way medium valve is arranged at the paste outlet and is communicated with the medium cavity. The one-way medium valve controls the discharge of the paste-like medium from the medium cavity and blocks the backflow of the paste-like medium and air into the medium cavity.

[0025] By adopting the above technical solution, the one-way medium valve can effectively prevent the paste-like medium or air from flowing back into the medium cavity when the container body is loosened, optimizing the use experience.

[0026] Optionally, the one-way medium valve includes a valve body. The valve body has elastic deformation characteristics. One end of the valve body is communicated with the medium cavity, and the other end is communicated to form an opening. The valve body has two sealing surfaces at the opening. When the valve body maintains its original shape, the two sealing surfaces are mutually attached to close the opening, and the valve body gradually contracts inwards towards the direction close to the opening.

[0027] By adopting the above technical solution, when the container body is squeezed, the paste-like medium pushes the two sealing surfaces open from the inside to the outside to open the opening. After the container body is loosened, the valve body resets under the action of its own elastic force to close the opening, preventing the paste-like medium or air from flowing back. The structure is simple and the reaction is rapid.

[0028] Optionally, taking two mutually attached sealing surfaces as a group, there are multiple groups of the sealing surfaces. The multiple groups of sealing surfaces are radially distributed and connected to each other, and the included angle between adjacent two groups of sealing surfaces is the same.

[0029] By adopting the above technical solutions, multiple sets of sealing surfaces cooperate with each other to open or close the opening, which not only facilitates the formation of a larger opening, but also has a faster reaction, more convenient extrusion of the paste-like medium, and better check valve effect.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. By squeezing the position of the container body located in the medium cavity or the gas cavity, the paste-like medium can be extruded from the paste outlet. At the same time, the piston slides correspondingly in the accommodating cavity. As the paste-like medium decreases, the piston gradually approaches the paste outlet, so that the remaining paste-like medium always remains in the medium cavity and will not move arbitrarily in the accommodating cavity. Even if the remaining paste-like medium is less, only one hand is needed to extrude the remaining paste-like medium, and it can be used as it is extruded. There is no need to use both hands to find the position of the paste in the container, and there is no need to adjust the extrusion method due to the change in the content of the paste-like medium, which greatly improves the convenience of extruding the paste-like medium;

[0032] 2. By enabling the piston to have the ability of elastic deformation, the sealing performance between the piston and the container body is ensured, so that even if the user squeezes the position where the piston is located, the paste-like medium can be normally extruded, further improving the arbitrariness of squeezing the container body and the convenience of use;

[0033] 3. With the help of the inner wall of the gas accumulation groove, on the one hand, the gas pushes the whole piston to move, and on the other hand, it makes the plug body expand outwards, improving the fitting degree between the sealing sleeve and the inner wall of the accommodating cavity, further improving the sealing effect and reducing the possibility of leakage of the paste-like medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0035] Figure 2 is along Figure 1 the cross-sectional view taken along A-A in

[0036] Figure 3 is the schematic diagram for showing the cross-section of other shapes of the accommodating cavity;

[0037] Figure 4 is the schematic diagram showing the piston alone in the embodiment of the present application;

[0038] Figure 5 is Figure 4 the cross-sectional view of the piston in

[0039] Figure 6 is the schematic diagram showing the one-way medium valve alone in the embodiment of the present application;

[0040] Figure 7 is Figure 6 the cross-sectional view of the one-way medium valve in

[0041] Figure 8 It is a schematic structural view of another embodiment of the one-way medium valve of the present application.

[0042] Reference numerals: 1, container body; 11, accommodation cavity; 111, medium cavity; 112, gas cavity; 12, paste outlet; 2, piston; 21, plug body; 211, gas accumulation groove; 22, sealing sleeve; 23, connecting ring; 3, one-way intake valve; 4, one-way medium valve; 41, valve body; 42, opening; 43, sealing surface; 5, end cover; 6, paste outlet pipe. Specific embodiments

[0043] The following will further elaborate on the present application in conjunction with the attached Figure 1-8 drawings.

[0044] An embodiment of the present application discloses a squeeze pump. Referring to Figure 1 and Figure 2 , it includes a container body 1 and a piston 2. An accommodation cavity 11 is formed inside the container body 1. The piston 2 is slidably disposed in the accommodation cavity 11. The circumferential side of the piston 2 abuts against the inner side wall of the accommodation cavity 11 and forms a sealing fit with the container body 1;

[0045] The piston 2 divides the accommodation cavity 11 into a non-communicating medium cavity 111 and a gas cavity 112. As the piston 2 slides in the accommodation cavity 11, the sizes of the medium cavity 111 and the gas cavity 112 change correspondingly. The medium cavity 111 is used to accommodate a paste medium and is communicated with a paste outlet 12; the gas cavity 112 is communicated with a one-way intake valve 3. The one-way intake valve 3 is used to control the one-way entry of air into the gas cavity 112 and prevent the air from escaping from the gas cavity 112;

[0046] At the same time, the container body 1 has the characteristic of elastic deformation. Elastic deformation means that under the action of an external force, an object deforms, and when the external force is withdrawn, the object can return to its original shape. That is to say, the container body 1 can withstand the extrusion of an external force, undergo a contraction deformation, so as to extrude the paste medium in the medium cavity 111 from the paste outlet 12, and return to the original shape of the container body 1 after the external force is withdrawn.

[0047] The aforementioned container body 1 with the characteristic of elastic deformation can be made of, but not limited to, elastic body materials such as rubber and plastic, or composite materials with the ability of elastic deformation such as carbon fiber reinforced plastic. However, the present invention is not limited to the specific material of the container body 1.

[0048] It should be noted that when the amount of the paste medium placed in the medium cavity 111 is different, the position of the piston 2 in the accommodation cavity 11 is different. Therefore, when squeezing the container body 1, it is possible to squeeze the part of the container body 1 located in the medium cavity 111, or it is also possible to squeeze the part of the container body 1 located in the gas cavity 112. Both methods can extrude the paste medium, but the extrusion processes are slightly different. The following is a classified description:

[0049] When there is a relatively large amount of paste medium in the container body 1, the piston 2 is located on the side of the accommodation cavity 11 away from the paste outlet 12, and the medium cavity 111 occupies most of the accommodation cavity 11. In this case, it is easier to squeeze the part of the container body 1 located in the medium cavity 111; when squeezing, the paste medium is extruded from the paste outlet 12 under the action of an external force, and at the same time the medium cavity 111 contracts. After releasing the container body 1, the container body 1 begins to recover, and the medium cavity 111 expands. However, due to the reduction of the internal medium, a negative pressure is formed in the medium cavity 111, and a pressure difference is formed between the medium cavity 111 and the gas cavity 112. Under the action of air pressure, the piston 2 is forced to slide in the direction of the paste outlet 12 to reduce the medium cavity 111, and at the same time gas enters the gas cavity 112 from the one-way intake valve 3 until the container body 1 is completely recovered, and the medium cavity 111, the gas cavity 112 and the atmosphere maintain pressure balance;

[0050] With daily use, the paste medium in the container body 1 gradually decreases. When the content is small, the piston 2 is located on the side of the accommodation cavity 11 close to the paste outlet 12, and the gas cavity 112 occupies most of the accommodation cavity 11. In this case, it is easier to squeeze the part of the container body 1 located in the gas cavity 112; when squeezing, the gas cavity 112 contracts, and the internal pressure increases (under the action of the one-way ventilation valve, the air in the gas cavity 112 cannot escape), and a pressure difference is formed between the gas cavity 112 and the medium cavity 111. Due to the existence of the pressure difference, the gas cavity 112 has a tendency to expand, and then pushes the piston 2 to slide in the direction of the paste outlet 12 to extrude the paste medium in the medium cavity 111 from the paste outlet 12. After releasing, the container body 1 begins to recover, the gas cavity 112 expands, and the internal pressure decreases. Air enters the gas cavity 112 from the one-way ventilation valve to balance the internal and external pressure differences until the container body 1 is completely recovered.

[0051] In summary, squeezing any position of the container body 1 can extrude the paste medium from the paste outlet 12, and during the squeezing process, the paste medium always remains in the medium cavity 111, that is, always remains in the position of the accommodation cavity 11 close to the paste outlet 12, and will not move arbitrarily in the accommodation cavity 11. Even if the remaining paste medium is small, only one hand is needed to extrude the remaining paste medium, which greatly improves the convenience of extruding the paste medium.

[0052] It should be noted that the foregoing paste-like medium may, but is not limited to, semi-solid substances between solids and liquids such as toothpaste, hand cream, pharmaceutical paste, food paste, or industrial paste, etc. However, the present invention is not limited to the type, function, and efficacy of the paste-like medium.

[0053] Furthermore, referring to Figure 2 , an outlet tube 6 may be provided at the paste outlet 12 of the container body 1. The outlet tube 6 extends away from the container body 1. When the container body 1 is squeezed, the paste-like medium flows out through the outlet tube 6 for use. The outlet tube 6 plays a role in guiding the flow of the paste-like medium, causing the paste-like medium to be extruded in a strip shape, which is more convenient for use. In addition, since the paste-like medium has a certain viscosity, the paste-like medium located in the outlet tube 6 can form a certain degree of seal for the outlet tube 6, preventing air or the extruded paste-like medium from flowing back into the medium cavity 111, thus optimizing the use experience.

[0054] It should be noted that for paste-like media with a relatively high viscosity, an outlet tube 6 with a larger diameter can be set to ensure that the paste-like medium can be extruded smoothly; while for paste-like media with a relatively low viscosity, an outlet tube 6 with a smaller diameter can be set, or the tube body of the outlet tube 6 can be extended to ensure that the paste-like medium forms an effective seal in the outlet tube 6 to prevent backflow.

[0055] Referring to Figure 1 and Figure 2 , in this embodiment, the accommodating cavity 11 may be columnar, and its cross-section is circular or an ellipse approximately circular. The columnar structure is more convenient for the piston 2 to continuously fit with the inner wall of the accommodating cavity 11 along the axial direction during sliding, ensuring the sealing effect, and the circular or approximately circular cross-section is also conducive to maintaining the seal between the piston 2 and the inner wall of the accommodating cavity 11. In this embodiment, the setting of the accommodating cavity 11 is only a preferred setting. In other embodiments, referring to Figure 3 , the cross-section may also be configured as other smooth arc-shaped shapes, and at the same time, the piston 2 is configured to correspond to the shape, but the present invention is not limited to the shape, size, etc. of the accommodating cavity 11.

[0056] Referring to Figure 1 , in this embodiment, the container body may have a flat bottom that is convenient for standing upright. When not in use, the medium container can be placed upright for easy access. In addition, the main shape of the container body 1 may, but is not limited to, be cylindrical, elliptical, square, rectangular, gourd-shaped, etc., but the present invention is not limited to the shape, size, or thickness of the container body 1.

[0057] Furthermore, referring to Figure 4 and Figure 5, the piston 2 includes a plug body 21 and a sealing sleeve 22. The sealing sleeve 22 is cylindrical and sleeved on the circumferential side of the plug body 21. One end of the cylindrical structure of the sealing sleeve 22 is attached to the circumferential side of the plug body 21 to form a tight connection, and the other end extends in the direction close to the paste outlet 12. The entire outer wall of the sealing sleeve 22 continuously adheres to the inner wall of the accommodating cavity 11 to form a seal, so as to prevent the paste-like medium from entering the gas cavity 112.

[0058] During specific implementation, the sealing sleeve 22 with different extension lengths can be configured according to the characteristics of the paste-like medium. For a paste-like medium that is relatively easy to flow, a longer sealing sleeve 22 can be configured to form a larger sealing surface 43 to ensure the sealing effect. However, the present invention is not limited to the size or thickness of the sealing sleeve 22, etc.

[0059] Further, referring to Figure 4 and Figure 5 , the plug body 21 can have a gradually shrinking structure in the direction close to the paste outlet 12, so as to form a certain gap between the plug body 21 and the sealing sleeve 22. At the same time, the sealing sleeve 22 can have the characteristic of elastic deformation (the meaning of elastic deformation has been explained above and will not be elaborated here. The elastic deformation mentioned later also has this meaning). When the container body 1 deforms under an external force, the sealing sleeve 22 correspondingly deforms under the compression of the container body 1 to maintain the fit with the inner wall of the medium cavity 111 during the deformation and restoration of the container body 1, avoid forming a gap, and improve the sealing effect.

[0060] Further, referring to Figure 5 , the sealing sleeve 22 can have a gradually expanding structure in the direction close to the paste outlet 12. Since the sealing sleeve 22 has elasticity, when the sealing sleeve 22 is placed in the accommodating cavity 11, the inner wall of the accommodating cavity 11 forms compression on the sealing sleeve 22. At this time, the sealing sleeve 22 has a tendency to expand outward, so that the sealing sleeve 22 can fit more stably on the inner wall of the accommodating cavity 11, further improving the sealing effect.

[0061] Referring to Figure 4 and Figure 5 , the plug body 21 can have the characteristic of elastic deformation, and a gas collecting groove 211 is provided on one side of the plug body 21 located in the gas cavity 112. The opening of the gas collecting groove 211 faces the gas cavity 112, and the bottom of the groove is located at the part of the plug body 21 close to the medium cavity 111, so that the plug body 21 presents an approximate bowl-shaped structure;

[0062] When there is a pressure difference between the gas cavity 112 and the medium cavity 111, the piston 2 slides within the accommodation cavity 11, and the container body 1 is undergoing deformation or recovery. At this time, the possibility of the paste-like medium seeping into the gas cavity 112 is the greatest. Due to the existence of the pressure difference at this time, the gas exerts pressure on the inner wall of the gas collecting groove 211. On the one hand, it is used to push the entire piston 2 to move, and on the other hand, it can cause the plug body 21 to expand outward to improve the fit between the sealing sleeve 22 and the inner wall of the accommodation cavity 11, further improving the sealing effect and reducing the possibility of leakage of the paste-like medium.

[0063] Further, referring to Figure 4 and Figure 5 The piston 2 may further include a connecting ring 23 that also has elastic deformation characteristics. The connecting ring 23 is integrally in a ring structure, and its cross-section is U-shaped. That is, one side of the connecting ring 23 is an arc surface, and the other side has a notch. Two annular connecting ends 231, an inner one and an outer one, are formed at the U-shaped notch of the connecting ring 23. The annular connecting end 231 located in the inner circle is attached to the plug body 21, and the annular connecting end 231 located in the outer circle is attached to the sealing sleeve 22. The connecting ring 23, the plug body 21, and the sealing sleeve 22 form a dense seamless structure;

[0064] When the container body 1 undergoes deformation or recovery, the distance between the two annular connecting ends 231 of the connecting ring 23 located in the inner and outer circles decreases. At the same time, relying on its own elastic force, it provides a certain support for the sealing sleeve 22, further improving the deformation ability of the entire piston 2 and the sealing effect of the sealing sleeve 22.

[0065] So far, the entire piston 2 has the characteristic of elastic deformation. During the deformation process of the container body 1, the piston 2 generates corresponding deformation to ensure the sealing between the piston 2 and the container body 1. When using the medium container of the present application, any position of the container body 1 can be squeezed, including the position where the piston 2 is located, without the need to adjust the squeezing method due to changes in the content of the paste-like medium, greatly improving the convenience of use.

[0066] Further, referring to Figure 2 and Figure 4 The outer wall of the plug body 21 close to the paste outlet 12 is adapted to the inner wall of the accommodation cavity 11 at the paste outlet 12. When there is little paste-like medium left in the medium cavity 111, at this time, squeezing the part of the container body 1 located in the gas cavity 112, the piston 2 continues to slide towards the paste outlet 12 and gradually fits with the inner wall of the accommodation cavity 11 to more thoroughly squeeze out the paste-like medium in the medium cavity 111 and reduce the residue.

[0067] Referring to Figure 2 and Figure 6, a one-way medium valve 4 can be provided at the paste outlet 12 of the container body 1. The one-way medium valve 4 is connected to the medium cavity 111 and is used to control the discharge of the paste medium from the medium cavity 111, while blocking the paste medium and air from flowing back into the medium cavity 111. For paste media with a viscosity relatively close to that of a liquid, it is difficult to form an effective seal in the paste outlet pipe 6, so backflow may occur, affecting the user experience. By utilizing the check function of the one-way medium valve 4, even if the viscosity of the paste medium is low, backflow can be effectively prevented.

[0068] It should be added that the aforementioned one-way air inlet valve 3 and one-way medium valve 4 can be, but are not limited to, spring-type one-way valves or diaphragm-type one-way valves, etc., one-way valves or check valves through which fluid media can only flow in one direction and cannot flow back. However, the present invention is not limited to the type, size, and material of the one-way valve. In addition, the one-way air inlet valve 3 and one-way medium valve 4 can be provided on the side or end face of the container body 1, as long as they can be connected to the corresponding cavities.

[0069] In this embodiment or other embodiments, referring to Figure 6 and Figure 7 , the one-way medium valve 4 may include a valve body 41. One end of the valve body 41 is connected to the medium cavity 111, and an opening 42 is formed at the other end. That is, the paste medium can enter the valve body 41 from the medium cavity 111 and finally flow out through the opening 42. The valve body 41 has the characteristic of elastic deformation. The valve body 41 has two sealing surfaces 43 at the opening 42. When the valve body 41 maintains its original shape, the two sealing surfaces 43 are mutually attached to close the opening 42. And the valve body 41 forms a contraction inclined surface in the direction close to the opening 42. That is, the valve body 41 gradually contracts inward in the direction close to the opening 42 and forms a structure similar to a fish tail shape.

[0070] When the container body 1 is squeezed, the pressure in the medium cavity 111 increases, and the paste medium pushes the two sealing surfaces 43 open from the inside out. The opening 42 of the valve body 41 is opened, and the paste medium flows out from the paste outlet 12. After the container body 1 is released, the paste medium no longer squeezes the sealing surface 43, and the valve body 41 resets under its own elastic force, and the two sealing surfaces 43 are attached again to close the opening 42, preventing the paste medium or air from flowing back, and at the same time pinching off the flowing paste medium.

[0071] It should be added that when the pressure in the medium cavity 111 is lower than the external environment, the paste medium or air will tend to flow back into the medium cavity 111. However, under the action of the pressure difference, the gas in the environment presses from the periphery of the valve body 41, which will further improve the degree of attachment between the sealing surfaces 43 and completely close the opening 42 to achieve the effect of preventing backflow.

[0072] Taking two mutually attached sealing surfaces 43 as a group, multiple groups of sealing surfaces 43 can be provided. The multiple groups of sealing surfaces 43 are radially distributed and interconnected. The multiple groups of sealing surfaces 43 open simultaneously to open the opening 42 and close simultaneously to close the opening 42. And to optimize the cooperation between the groups of sealing surfaces 43, the included angle between adjacent two groups of sealing surfaces 43 is the same.

[0073] As an example, referring to Figure 8 , four groups of sealing surfaces 43 can be provided. When the opening 42 is closed, the included angle between adjacent two groups of sealing surfaces 43 is 90 degrees, and the four groups of sealing surfaces 43 as a whole present a cross-shaped structure. In other embodiments, other numbers of groups can also be provided, and the size of the included angle is correspondingly adjusted, but the present invention is not limited to the number, arrangement, etc. of the sealing surfaces 43.

[0074] Referring to Figure 1 and Figure 2 , to prevent the paste-like medium from being extruded due to accidental extrusion, an end cap 5 can be provided at the paste outlet 12 of the container body 1. The end cap 5 is detachably connected to the container body 1, and the end cap 5 is connected to the container body 1 and seals the paste outlet 12. In this embodiment, the end cap 5 and the container body 1 can adopt but are not limited to screwing, buckling, clamping and other methods. Screwing is the best, which is convenient for disassembly and assembly and can withstand greater pressure, but the present invention is not limited to the connection method between the end cap 5 and the container body 1.

[0075] The implementation principle of a squeezing pump disclosed in the embodiments of the present application is as follows:

[0076] Before use, remove the end cap 5;

[0077] When squeezing the position of the container body 1 where the medium cavity 111 is located, the medium cavity 111 shrinks. Under the external force extrusion, the paste-like medium flows out from the paste outlet 12 through the one-way medium valve 4. When the container body 1 is released, the container body 1 begins to restore its shape, the medium cavity 111 expands and forms a negative pressure. Under the action of the pressure difference, air enters the gas cavity 112 from the one-way air inlet valve 3 and pushes the piston 2 to slide towards the paste outlet 12 until the container body 1 is completely restored;

[0078] When squeezing the position of the container body 1 where the gas cavity 112 is located, the gas cavity 112 shrinks, the pressure increases, a pressure difference is formed with the medium cavity 111, and then the piston 2 is pushed to slide towards the paste outlet 12. The piston 2 extrudes the paste-like medium from the paste outlet 12. After the container body 1 is released, the container body 1 begins to restore its shape, the gas cavity 112 expands, and air enters the gas cavity 112 from the one-way air inlet valve 3 until the container body 1 is completely restored;

[0079] Meanwhile, the piston 2 has the characteristic of elastic deformation, so that no matter how much paste medium remains in the medium cavity 111, squeezing any position of the container body 1, including the position where the piston 2 is located, can extrude the paste medium, greatly improving the convenience of use.

[0080] The above are all the preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A pinch pump, characterized in that: include: The container body (1) has elastic deformation characteristics and has an accommodating cavity (11) formed therein; A piston (2) is slidably disposed in the accommodating cavity (11) and is sealed with the container body (1), wherein the piston (2) separates the accommodating cavity (11) into a medium cavity (111) and a gas cavity (112) which are not connected to each other, and the medium cavity (111) is used to accommodate a paste medium; A paste outlet pipe (6) connected to the medium cavity (111); The one-way air inlet valve (3) is connected to the gas cavity (112), controls the one-way entry of air into the gas cavity (112), and blocks the escape of air from the gas cavity (112).

2. A pinch pump according to claim 1, characterized in that: The piston (2) has elastic deformation characteristics as a whole.

3. A pinch pump according to claim 1, characterized in that: The piston (2) comprises a plug body (21) and a sealing sleeve (22); the sealing sleeve (22) is sleeved around the plug body (21) and is sealingly fitted to the inner wall of the accommodating cavity (11); one end of the sealing sleeve (22) is connected to the plug body (21), and the other end extends in a direction close to the paste outlet (12).

4. A pinch pump according to claim 3, characterized in that: A gap is formed between the sealing sleeve (22) and the plug body (21), and the sealing sleeve (22) has elastic deformation characteristics.

5. A pinch pump according to claim 4, characterized in that: The sealing sleeve (22) gradually expands in a direction approaching the paste outlet (12).

6. A pinch pump according to claim 4, characterized in that: The plug body (21) has elastic deformation characteristics, and a gas gathering groove (211) is formed on one side of the plug body (21) located in the gas cavity (112), the opening of the gas gathering groove (211) faces the gas cavity (112), and the bottom of the groove is located at a portion of the plug body (21) close to the medium cavity (111).

7. A kneading pump according to any one of claims 4 to 6, characterized in that: The piston (2) further comprises a connecting ring (23), wherein the connecting ring (23) has elastic deformation characteristics and is an annular structure. The connecting ring (23) forms two inner and outer annular connecting ends (231), wherein the annular connecting end (231) located on the inner ring is attached to the plug body (21), and the annular connecting end (231) located on the outer ring is attached to the sealing sleeve (22).

8. A pinch pump according to claim 1, characterized in that: It also comprises a one-way medium valve (4), which is arranged at the paste outlet (12) and is connected to the medium cavity (111), and the one-way medium valve (4) controls the paste medium to be discharged from the medium cavity (111) and blocks the paste medium and air from flowing back into the medium cavity (111).

9. A pinch pump according to claim 8, characterized in that: The one-way medium valve (4) comprises a valve body (41), the valve body (41) having elastic deformation characteristics, one end of the valve body (41) being connected to the medium cavity (111), and the other end being connected to form an opening (42), the valve body (41) having two sealing surfaces (43) located at the opening (42), and when the valve body (41) maintains its original shape, the two sealing surfaces (43) fit each other to close the opening (42), and the valve body (41) gradually contracts inwards in a direction approaching the opening (42).

10. A pinch pump according to claim 9, characterized in that: Two mutually abutting sealing surfaces (43) form a group, and a plurality of groups of sealing surfaces (43) are provided. The plurality of groups of sealing surfaces (43) are radially distributed and interconnected, and the angles between two adjacent groups of sealing surfaces (43) are the same.

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