Back suction type all-plastic emulsion pump with external spring

Abstract

The utility model relates to the technical field of emulsion pumps, and discloses a back suction type external spring all-plastic emulsion pump which is of an all-plastic structure and comprises a pump body, a threaded sleeve, a lock cover, a pressing head, a main column, an auxiliary column, a piston, a spring and a one-way ball valve. The main column is provided with a back suction cavity which is located between the inner wall of the main column and the outer wall of the auxiliary column and communicates with the pressing head. The piston is movably and hermetically connected with the inner wall of the pump body and is movably and hermetically connected with the inner wall of the lower end of the main column to hermetically close the lower end of the back-suction cavity; the lock cover is provided with a waterproof wall which can be embedded into the pressing head; and when the spring is in a natural state, the upper end part of the waterproof wall is embedded in the pressing head. According to the back-suction type all-plastic emulsion pump with the external spring, water drops can be prevented from entering the inner cavity of the pump body from a gap between the main column and the lock cover to pollute a material body during showering, the back-suction or back-suction function is achieved, and the problem that waste or pollution is caused by residual material liquid after liquid is discharged from the pressing head is solved; therefore, clean, environment-friendly and sanitary effects are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of emulsion pumps, in particular to a suction-back type external spring all-plastic emulsion pump. Background Art

[0002] In the packaging of cosmetics, skin care products and daily washing and care products, as a common packaging structure, the sealing performance, hygiene and ease of use of the emulsion pump have always been the key points of design. The traditional emulsion pump structure includes a pump body, a screw thread sleeve, a lock cap, a pressing head, a main column, a secondary column, a piston, a spring and a one-way ball valve; the screw thread sleeve is installed on the upper end of the pump body through the lock cap; the upper end of the main column can slide through the lock cap and communicate with the pressing head. However, in the process of using this emulsion pump structure, it is often not clean and hygienic. On the one hand, as Figure 6 shown, there is a gap between the main column and the lock cap. Especially when taking a shower, water droplets enter the inner cavity of the pump body from this gap and contaminate the material, which is not clean and hygienic; on the other hand, after use, due to incomplete suction-back, there are problems such as liquid residue on the pressing head, easy waste or contamination. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the problems of the prior art and provide a clean and hygienic suction-back type external spring all-plastic emulsion pump.

[0004] In order to achieve the above purpose, the utility model adopts the following scheme:

[0005] A suction-back type external spring all-plastic emulsion pump, which is of an all-plastic structure, includes a pump body, a screw thread sleeve, a lock cap, a pressing head, a main column, a secondary column, a piston, a spring and a one-way ball valve; the screw thread sleeve is installed on the upper end of the pump body through the lock cap; the spring is installed between the pressing head and the lock cap and sleeved on the main column;

[0006] The upper end of the main column can slide through the lock cap and communicate with the pressing head; the secondary column is adaptively clamped and embedded into the main column from the lower end of the main column; the main column has a suction-back cavity located between the inner wall of the main column and the outer wall of the secondary column and communicating with the pressing head;

[0007] The piston is movably and sealingly sleeved on the secondary column and is movably and sealingly connected with the inner wall of the pump body, and is movably and sealingly connected with the inner wall of the lower end of the main column to seal the lower end of the suction-back cavity;

[0008] The lock cap is provided with a waterproof wall that can be embedded into the pressing head; when the spring is in a natural state, the upper part of the waterproof wall is embedded in the pressing head.

[0009] Further, the pressing head includes a pressing nozzle, a pressing ring wall, and a connecting sleeve; the upper end of the pressing ring wall is connected to the pressing nozzle; the connecting sleeve is disposed within the pressing ring wall and is in communication with the pressing nozzle, and is also in communication with the upper end of the main column; a ring wall cavity for embedding the waterproof wall is formed between the inner wall of the pressing ring wall and the outer wall of the pressing nozzle;

[0010] When the spring is in its natural state, the upper end portion of the waterproof wall is embedded within the pressing ring wall.

[0011] Further, the height of the pressing ring wall is greater than or equal to the height of the waterproof wall.

[0012] Further, the pressing ring wall is a circular tubular structure; the connecting sleeve is adaptively embedded within the upper end of the main column and is threadedly connected to the upper end of the main column.

[0013] Further, the main column includes an upper pipe column, a middle pipe column, a lower pipe column, and reinforcing support bars; the upper pipe column, the middle pipe column, and the lower pipe column are sequentially connected in communication from top to bottom;

[0014] The pressing head is adaptively sleeved and connected in communication with the inner cavity of the upper pipe column; several of the reinforcing support bars are arranged at intervals on the inner wall of the middle pipe column around the central axis of the middle pipe column; an adjacent pair of the reinforcing support bars forms a suction cavity that communicates the upper pipe column and the lower pipe column; the cavity formed by several of the reinforcing support bars is adaptively sleeved and connected to the upper end of the auxiliary column; the piston is movably and sealingly connected to the inner wall of the lower end of the lower pipe column to seal the lower end of the suction cavity.

[0015] Further, there are 3 reinforcing support bars.

[0016] Further, the piston includes an inner sealing ring portion, an outer sealing ring portion, and a sealing connection portion; the inner sealing ring portion is embedded within the outer sealing ring portion and is connected through the sealing connection portion; the inner sealing ring portion has an inner sealing sleeve cavity that is movably and sealingly sleeved on the lower end of the auxiliary column; the outer wall of the inner sealing ring portion, the inner wall of the outer sealing ring portion, and the upper wall of the sealing connection portion enclose an upper inner ring cavity for embedding the lower end of the main column; when the lower end of the main column is embedded within the upper inner ring cavity, the inner wall of the main column is movably and sealingly connected to the outer wall of the inner sealing ring portion; the outer wall of the outer sealing ring portion is movably and sealingly connected to the inner wall of the pump body.

[0017] Further, the spring includes a circular ring and an elastic spiral body; at least two of the circular rings are correspondingly arranged at intervals from top to bottom; an adjacent pair of the circular rings is connected by one of the elastic spiral bodies; the elastic spiral body includes:

[0018] The first elastic helical strip is arranged between two adjacent upper and lower rings. The lower ends of several said first elastic helical strips are evenly distributed on the lower ring around the central axis of the ring; the upper ends of several said first elastic helical strips all extend spirally upward to the upper ring and are connected to the upper ring.

[0019] The second elastic helical strip spirally intersects the first elastic helical strip in the opposite direction from the lower end to the upper end of the first elastic helical strip on each said first elastic helical strip; several second elastic helical strips are evenly distributed between two adjacent rings around the central axis of the ring.

[0020] Furthermore, an outward convex edge is provided on the outer wall of the upper end of the pump body; the screw tooth sleeve is correspondingly sleeved on the upper end of the pump body and placed on the outward convex edge; the lock cover is embedded in the pump body and connected to the upper end of the pump body to lock the screw tooth sleeve on the outward convex edge.

[0021] A suction pipe communicated with the one-way ball valve is sleeved on the lower end of the pump body.

[0022] Furthermore, the pump body, the screw tooth sleeve, the lock cover, the pressing head, the main column, the auxiliary column, the spring and the one-way ball valve are all made of PP material; the piston is made of PE material.

[0023] Compared with the existing technology, the utility model has the following advantages:

[0024] 1. The utility model is provided with a waterproof wall on the lock cover that can be embedded in the pressing head. When the spring is in a natural state, the upper part of the waterproof wall is embedded in the pressing head, and a waterproof design is carried out on the main column. The upper end of the main column is wrapped in the waterproof wall and the pressing head to prevent water droplets from entering the inner cavity of the pump body through the gap between the main column and the lock cover during showering and polluting the material, so as to achieve the effect of cleaning, environmental protection and hygiene.

[0025] 2. The utility model combines the pump body, the screw tooth sleeve, the lock cover, the pressing head, the main column, the auxiliary column, the piston, the spring and the one-way ball valve, improves the main column and the piston. By setting a suction cavity communicated with the pressing head on the main column, the piston is movably and hermetically connected to the inner wall of the lower end of the main column to seal the lower end of the suction cavity, so as to form a suction structure between the main column and the piston. When the pressing head is pressed to the bottom and then released and rebounds, the upper end inside the piston is movably sealed with the inner wall of the main column, and the whole suction cavity forms a sealed state. During the process of the spring acting to make the main column rebound and reset, the upper end of the piston slides relatively with the inner wall of the main column, and the friction seal is downward, so that the material is sucked back, thus achieving a good effect of suction or reverse suction, solving the problem of waste or pollution caused by the residual material liquid after the pressing head discharges the liquid, and making the use cleaner, environmentally friendly and hygienic.

[0026] 3. The back-suction external spring all-plastic emulsion pump of the present utility model has an all-plastic structure, which is lightweight, easy to carry; has good toughness, high yield strength, and long service life; and has simple process, environmental protection, and is conducive to recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following further describes the present application in detail with reference to the drawings and specific embodiments.

[0028] Figure 1 is a schematic cross-sectional structure diagram of the back-suction external spring all-plastic emulsion pump of the present utility model when the spring is in a natural state.

[0029] Figure 2 is a schematic cross-sectional structure diagram of the back-suction external spring all-plastic emulsion pump of the present utility model when the spring is in a fully compressed state.

[0030] Figure 3 is a schematic three-dimensional structure diagram of the main column of the present utility model.

[0031] Figure 4 is a schematic three-dimensional structure diagram of the piston of the present utility model.

[0032] Figure 5 is a schematic three-dimensional structure diagram of the spring of the present utility model.

[0033] Figure 6 is a schematic cross-sectional structure diagram of the emulsion pump structure in the background technology of the present utility model.

[0034] The figures include:

[0035] pump body 1, outer convex edge 11, screw thread sleeve 2, lock cover 3, waterproof wall 31, pressing head 4, pressing nozzle 41, pressing ring wall 42, connecting sleeve 43, ring wall cavity 44, main column 5, upper pipe column 51, middle pipe column 52, lower pipe column 53, strengthening support strip 54, back-suction cavity 55, auxiliary column 6, piston 7, inner sealing ring part 71, outer sealing ring part 72, sealing connection part 73, upper inner ring cavity 74, spring 8, circular ring 81, elastic spiral body 82, first elastic spiral strip 821, second elastic spiral strip 822, one-way ball valve 9, suction pipe 10. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following further describes the specific embodiments of the present utility model in detail with reference to the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but do not limit the scope of the present utility model.

[0037] As Figures 1 to 5As shown in the figure, a suction-back type external spring all-plastic emulsion pump has an all-plastic structure. Such a suction-back type external spring all-plastic emulsion pump structure is lightweight and convenient to carry; has good toughness, high yield strength, and a long service life; and has simple processes, is environmentally friendly, and is conducive to recycling. The suction-back type external spring all-plastic emulsion pump includes a pump body 1, a screw thread sleeve 2, a lock cover 3, a pressing head 4, a main column 5, a sub-column 6, a piston 7, a spring 8, a one-way ball valve 9, and a suction pipe 10; preferably, the pump body 1, the screw thread sleeve 2, the lock cover 3, the pressing head 4, the main column 5, the sub-column 6, the spring 8, the one-way ball valve 9, and the suction pipe 10 are all made of PP material; the piston 7 is made of PE material. Designing the suction-back type external spring all-plastic emulsion pump with such materials can endow the pump with high strength, hardness, and wear resistance, as well as excellent structural stability, environmental protection, and safety and other advantages in many aspects. Of course, according to requirements, other materials can also be used to make the suction-back type external spring all-plastic emulsion pump. The screw thread sleeve 2 is installed on the upper end of the pump body 1 through the lock cover 3. The spring 8 is installed between the pressing head 4 and the lock cover 3 and sleeved on the main column 5. Specifically, in order to stably install and fix the screw thread cover, an outward convex edge 11 is provided on the outer wall of the upper end of the pump body 1; the screw thread sleeve 2 is correspondingly sleeved on the upper end of the pump body 1 and placed on the outward convex edge 11; the lock cover 3 is embedded in the pump body 1 and connected to the upper end of the pump body 1 to lock the screw thread sleeve 2 on the outward convex edge 11. The upper end of the main column 5 can slide through the lock cover 3 and communicate with the pressing head 4; the sub-column 6 is correspondingly and fittingly inserted into the main column 5 from the lower end of the main column 5; the main column 5 has a suction-back cavity 55 located between the inner wall of the main column 5 and the outer wall of the sub-column 6 and communicating with the pressing head 4. The piston 7 is movably and sealingly sleeved on the sub-column 6 and is movably and sealingly connected to the inner wall of the pump body 1, and is movably and sealingly connected to the inner wall of the lower end of the main column 5 to seal the lower end of the suction-back cavity 55. The lock cover 3 has a waterproof wall 31 that can be embedded in the pressing head 4; when the spring 8 is in a natural state, the upper part of the waterproof wall 31 is embedded in the pressing head 4. Preferably, when the spring 8 is in a natural state, the length of the upper part of the waterproof wall 31 embedded in the pressing head 4 is 1-5 mm. Such a design can better wrap the upper end of the main column 5 in the waterproof wall 31 and the pressing head 4, preventing water droplets from entering the inner cavity of the pump body 1 through the gap between the main column 5 and the lock cover 3 during showering and contaminating the material, thus achieving the effect of cleaning, environmental protection, and hygiene. The lower end of the pump body 1 is sleeved with a suction pipe 10 connected to the one-way ball valve 9.

[0038] The suction-back type external spring all-plastic emulsion pump combines a pump body 1, a screw thread sleeve 2, a lock cover 3, a pressing head 4, a main column 5, a sub-column 6, a piston 7, a spring 8 and a one-way ball valve 9, and is improved in two aspects to achieve the effects of cleaning, environmental protection and hygiene and preventing material contamination. On the one hand, a waterproof wall 31 that can be embedded in the pressing head 4 is provided on the lock cover 3. When the spring 8 is in a natural state, the upper part of the waterproof wall 31 is embedded in the pressing head 4, and a waterproof design is carried out on the main column 5. The upper end of the main column 5 is wrapped in the waterproof wall 31 and the pressing head 4 to prevent water droplets from entering the inner cavity of the pump body 1 through the gap between the main column 5 and the lock cover 3 during showering and contaminating the material, thus achieving the effect of cleaning, environmental protection and hygiene. On the other hand, the main column 5 and the piston 7 are improved. By providing a suction-back cavity 55 communicating with the pressing head 4 on the main column 5, the piston 7 is movably and hermetically connected to the inner wall of the lower end of the main column 5 to seal the lower end of the suction-back cavity 55, so as to form a suction-back structure between the main column 5 and the piston 7. When the pressing head is pressed to the bottom and then released and rebounds, the upper end inside the piston 7 is movably sealed with the inner wall of the main column 5, and the entire suction-back cavity 55 forms a sealed state. During the process of the spring 8 acting to make the main column 5 rebound and reset, the upper end of the piston 7 slides relative to the inner wall of the main column 5, and friction seals downward, acting on the material to be sucked back, thus achieving a good suction-back or anti-suction effect, solving the problem of waste or contamination caused by the residual liquid of the pressing head 4 after liquid discharge, and being more clean, environmentally friendly and hygienic to use.

[0039] In this embodiment, the pressing head 4 includes a pressing spray head 41, a pressing ring wall 42 and a connecting sleeve 43; the upper end of the pressing ring wall 42 is connected to the pressing spray head 41; the connecting sleeve 43 is placed inside the pressing ring wall 42 and communicates with the pressing spray head 41, and also communicates with the upper end of the main column 5; a ring wall cavity 44 for the waterproof wall 31 to be embedded is formed between the inner wall of the pressing ring wall 42 and the outer wall of the pressing spray head 41; when the spring 8 is in a natural state, the upper part of the waterproof wall 31 is embedded in the pressing ring wall 42. By combining the pressing spray head 41, the pressing ring wall 42 and the connecting sleeve 43, and using the ring wall cavity 44 for the waterproof wall 31 to be embedded, when the spring 8 is in a natural state, the upper part of the waterproof wall 31 is embedded in the pressing ring wall 42. Such a design can effectively wrap the upper end of the main column 5 in the waterproof wall 31 and the pressing head 4, preventing water droplets from entering the inner cavity of the pump body 1 through the gap between the main column 5 and the lock cover 3 during showering and contaminating the material, thus achieving the effect of cleaning, environmental protection and hygiene.

[0040] Preferably, the height of the pressing ring wall 42 is greater than or equal to the height of the waterproof wall 31. By designing the height between the pressing ring wall 42 and the waterproof wall 31 in this way, when the spring 8 is compressed, the waterproof wall 31 can enter the pressing ring wall 42 with sufficient space. In this embodiment, when the spring 8 is in a fully compressed state, the height of the pressing ring wall 42 is equal to the height of the waterproof wall 31, and the upper end of the waterproof wall 31 just fits into the upper end of the pressing ring wall 42.

[0041] To facilitate the connection and disassembly between the connecting sleeve 43 and the main column 5, the connecting sleeve 43 is adaptively embedded in the upper end of the main column 5 and is threadedly connected to the upper end of the main column 5.

[0042] In this embodiment, the main column 5 includes an upper pipe column 51, a middle pipe column 52, a lower pipe column 53, and a reinforcing support bar 54; the upper pipe column 51, the middle pipe column 52, and the lower pipe column 53 are connected in communication with each other from top to bottom in sequence; the pressing head 4 is connected in communication with the inner cavity of the upper pipe column 51 in a fitting and sleeving manner; a plurality of the reinforcing support bars 54 are arranged at intervals on the inner wall of the middle pipe column 52 around the central axis of the middle pipe column 52; preferably, there are 3 reinforcing support bars 54. Of course, the number of the reinforcing support bars 54 can also be reasonably set according to requirements. Two adjacent reinforcing support bars 54 form the suction cavity 55 that communicates the upper pipe column 51 and the lower pipe column 53; the cavity formed by a plurality of the reinforcing support bars 54 is connected in a fitting and sleeving manner with the upper end of the auxiliary column 6; the piston 7 is movably and sealingly connected to the inner wall of the lower end of the lower pipe column 53 to seal the lower end of the suction cavity 55. The piston 7 includes an inner sealing ring portion 71, an outer sealing ring portion 72, and a sealing connection portion 73; the inner sealing ring portion 71 is embedded in the outer sealing ring portion 72 and is connected through the sealing connection portion 73; the inner sealing ring portion 71 has an inner sealing sleeve cavity that can be movably and sealingly sleeved on the lower end of the auxiliary column 6; the outer wall of the inner sealing ring portion 71, the inner wall of the outer sealing ring portion 72, and the upper wall of the sealing connection portion 73 enclose an upper inner ring cavity 74 into which the lower end of the main column 5 can be embedded; when the lower end of the main column 5 is embedded in the upper inner ring cavity 74, the inner wall of the main column 5 is movably and sealingly connected to the outer wall of the inner sealing ring portion 71; the outer wall of the outer sealing ring portion 72 is movably and sealingly connected to the inner wall of the pump body 1. By improving the specific structures of the main column 5 and the piston 7, the upper pipe column 51, the middle pipe column 52, the lower pipe column 53, and the reinforcing support bar 54 form the main column 5, realizing stable and reliable connections between the main column 5 and the pressing head 4 and between the main column 5 and the auxiliary column 6. At the same time, the suction cavity 55 is formed, increasing the space for reverse suction and suction, which is beneficial to solving the problem of waste or pollution caused by the residual liquid material at the pressing head 4 after liquid discharge. At the same time, in order to achieve a better suction or reverse suction effect, the piston 7 is improved. By providing the inner sealing ring portion 71, the outer sealing ring portion 72, and the sealing connection portion 73 to form the piston 7, it is convenient for the pressing head 4 to discharge liquid. At the same time, the lower end of the main column 5 is embedded in the upper inner ring cavity 74, and the inner wall of the main column 5 is movably and sealingly connected to the outer wall of the inner sealing ring portion 71. With this setting, during the reset process of the spring 8, a frictional seal and downward relative movement will occur between the piston 7 and the inner wall of the lower end of the main column 5, sucking back the material at the pressing head 4, quickly sucking back or reverse sucking the material of the pressing head 4 into the suction cavity 55, thereby achieving a good suction or reverse suction effect and solving the problem of waste or pollution caused by the residual liquid material at the pressing head 4 after liquid discharge, making it more clean, environmentally friendly, and hygienic to use.

[0043] In this embodiment, the spring 8 includes a circular ring 81 and an elastic helix 82; at least two of the circular rings 81 are arranged at intervals corresponding to each other from top to bottom; two adjacent circular rings 81 are connected by one elastic helix 82; the elastic helix 82 includes a first elastic helix strip 821 and a second elastic helix strip 822. Among them, between two adjacent circular rings 81 up and down, the lower ends of several first elastic helix strips 821 are uniformly arranged on the lower circular ring 81 around the central axis of the circular ring 81; the upper ends of several first elastic helix strips 821 all extend spirally upward to the upper circular ring 81 and are connected to the upper circular ring 81; the second elastic helix strip 822 spirally intersects the first elastic helix strip 821 in the opposite direction from the lower end to the upper end of the first elastic helix strip 821 on each first elastic helix strip 821; several second elastic helix strips 822 are uniformly arranged between two adjacent circular rings 81 around the central axis of the circular ring 81. The several first elastic helix strips 821 and the several second elastic helix strips 822 intersect in opposite spiral ways to form the elastic helix 82, which is connected between two adjacent circular rings 81. Then, at least 2 circular rings 81 are arranged at intervals corresponding to each other from top to bottom and combined with at least 1 elastic helix 82 to form a mesh hollow tubular structure with meshes, thereby strengthening the compressive yield stability of the elastic structure body with good elastic effects, having better elastic performance, more stable anti-deformation ability, flexible and stable structure, good resilience performance, and good elastic effects. When applied to a lotion pump, it can well realize flexible and stable rebound to eject the lotion.

[0044] The working process of the present utility model is as follows:

[0045] During use, the pressing head 4, the main column 5, the auxiliary column 6, and the piston 7 move in the up and down direction relative to the pump body 1 to realize the discharging of the liquid from the pressing head 4. When the pressing head 4 is pressed to the bottom and then released, during the process of the spring 8 rebounding, on the one hand, the piston 7 is movably and sealingly connected to the inner wall of the lower end of the main column 5 to seal the lower end of the suction cavity 55. During the process of the spring 8 resetting, the piston 7 and the inner wall of the lower end of the main column 5 move downward relative to each other in a friction-sealed manner, sucking back the material at the pressing head 42, and quickly sucking back or reverse-sucking the material of the pressing head 4 into the suction cavity 55, so as to achieve a good suction-back or reverse-suction effect.

[0046] In summary, the embodiment of the present utility model provides a suction-back type external spring all-plastic lotion pump, and among them, the suction-back type external spring all-plastic lotion pump has the following advantages:

[0047] 1. In the utility model, a waterproof wall 31 that can be embedded in the pressing head 4 is provided on the lock cover 3. When the spring 8 is in a natural state, the upper part of the waterproof wall 31 is embedded in the pressing head 4, and a waterproof design is carried out on the main column 5. The upper end of the main column 5 is wrapped in the waterproof wall 31 and the pressing head 4 to prevent water droplets from entering the inner cavity of the pump body 1 through the gap between the main column 5 and the lock cover 3 during showering and polluting the material, so as to achieve the effect of cleaning, environmental protection and hygiene.

[0048] 2. The utility model combines the pump body 1, the screw thread sleeve 2, the lock cover 3, the pressing head 4, the main column 5, the auxiliary column 6, the piston 7, the spring 8 and the one-way ball valve 9, improves the main column 5 and the piston 7. By arranging a suction cavity 55 communicated with the pressing head 4 on the main column 5, the piston 7 is movably and hermetically connected with the inner wall of the lower end of the main column 5 to seal the lower end of the suction cavity 55, so as to form a suction structure between the main column 5 and the piston 7. When the pressing head is pressed to the bottom and then released and rebounds, the upper end inside the piston 7 is movably sealed with the inner wall of the main column 5, and the whole suction cavity 55 forms a sealed box state. During the process that the spring 8 acts to make the main column 5 rebound and reset, the upper end of the piston 7 slides relatively with the inner wall of the main column 5, and friction seals downward, so that the material is sucked back, thus achieving a good effect of suction or reverse suction, solving the problems of waste or pollution caused by the residual material liquid after the pressing head 4 discharges liquid, and being more clean, environmentally friendly and hygienic in use.

[0049] 3. The suction-type external spring all-plastic emulsion pump of the utility model is of an all-plastic structure, with a light weight, convenient to carry; good toughness, high yield strength and long service life; and simple process, environmental protection and beneficial to recycling.

[0050] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present application, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present application.

Claims

1. A back-suction type external spring all-plastic lotion pump, which is a fully plastic structure, including a pump body, a screw sleeve, a locking cover, a pressing head, a main column, a secondary column, a piston, a spring and a one-way ball valve; the screw sleeve is installed on the upper end of the pump body through the locking cover; the spring is installed between the pressing head and the locking cover and sleeved on the main column; characterized in that: The upper end of the main column can slide through the lock cover and communicate with the pressing head; the secondary column is embedded in the main column through the adapter card at the lower end of the main column; the main column has a suction cavity located between the inner wall of the main column and the outer wall of the secondary column and connected to the pressing head; The piston is movably and sealingly sleeved on the secondary column and movably and sealingly connected to the inner wall of the pump body, and movably and sealingly connected to the inner wall of the lower end of the main column to seal and close the lower end of the suction chamber; The lock cover is provided with a waterproof wall which can be embedded in the pressing head; when the spring is in a natural state, the upper end portion of the waterproof wall is embedded in the pressing head.

2. The back-suction type external spring all-plastic lotion pump according to claim 1, characterized in that: The pressing head comprises a pressing nozzle, a pressing ring wall and a connecting sleeve; the upper end of the pressing ring wall is connected to the pressing nozzle; the connecting sleeve is placed in the pressing ring wall and is connected to the pressing nozzle, and is connected to the upper end of the main column; an annular wall cavity is formed between the inner wall of the pressing ring wall and the outer wall of the pressing nozzle, into which the waterproof wall can be embedded; When the spring is in a natural state, the upper end portion of the waterproof wall is embedded in the pressing ring wall.

3. The back-suction type external spring all-plastic lotion pump according to claim 2, characterized in that: The height of the pressing ring wall is greater than or equal to the height of the waterproof wall.

4. The back-suction type external spring all-plastic lotion pump according to claim 2, characterized in that: The pressing ring wall is a circular tubular structure; the connecting sleeve is adapted to be embedded in the upper end of the main column and is threadedly connected to the upper end of the main column.

5. The back-suction type external spring all-plastic lotion pump according to claim 1, characterized in that: The main column includes an upper column, a middle column, a lower column and a reinforcing support strip; the upper column, the middle column and the lower column are sequentially connected from top to bottom; The pressing head is connected to the inner cavity of the upper tube column by a matching sleeve; a plurality of the reinforcing support strips are arranged on the inner wall of the middle tube column at intervals around the central axis of the middle tube column; two adjacent reinforcing support strips form the back-suction cavity connecting the upper tube column and the lower tube column; the cavity surrounded by the plurality of the reinforcing support strips is connected to the upper end of the secondary column by a matching sleeve; the piston is movably sealed to the inner wall of the lower end of the lower tube column to seal and close the lower end of the back-suction cavity.

6. The back-suction type external spring all-plastic lotion pump according to claim 5, characterized in that: There are three reinforcing support bars.

7. The back-suction type external spring all-plastic lotion pump according to claim 1, characterized in that: The piston includes an inner sealing ring portion, an outer sealing ring portion and a sealing connection portion; the inner sealing ring portion is embedded in the outer sealing ring portion and connected through the sealing connection portion; the inner sealing ring portion has an inner sealing sleeve cavity that can be movably sealed and sleeved on the lower end of the secondary column; the outer wall of the inner sealing ring portion, the inner wall of the outer sealing ring portion and the upper wall of the sealing connection portion form an upper inner ring cavity for the lower end of the main column to be embedded in; when the lower end of the main column is embedded in the upper inner ring cavity, the inner wall of the main column is movably and sealingly connected to the outer wall of the inner sealing ring portion; the outer wall of the outer sealing ring portion is movably and sealingly connected to the inner wall of the pump body.

8. The back-suction type external spring all-plastic lotion pump according to claim 1, characterized in that: The spring comprises a ring and an elastic spiral; at least two of the rings are arranged correspondingly from top to bottom; two adjacent rings are connected by an elastic spiral; the elastic spiral comprises: A first elastic spiral strip, between two adjacent circular rings, the lower ends of a plurality of the first elastic spiral strips are evenly arranged on the lower circular ring around the central axis of the circular ring; the upper ends of a plurality of the first elastic spiral strips are spirally extended upward to the upper circular ring and connected to the upper circular ring; The second elastic spiral strips are spirally intersected on each of the first elastic spiral strips from the lower end to the upper end thereof in the opposite direction to the first elastic spiral strips; and a plurality of second elastic spiral strips are evenly arranged between two adjacent rings around the central axis of the ring.

9. The back-suction type external spring all-plastic lotion pump according to claim 1, characterized in that: The outer wall of the upper end of the pump body is provided with an outer convex edge; the screw sleeve is adapted to be mounted on the upper end of the pump body and is placed on the outer convex edge; the locking cover is embedded in the pump body and connected to the upper end of the pump body to lock the screw sleeve on the outer convex edge; The lower end of the pump body is sleeved with a suction pipe connected to the one-way ball valve.

10. The back-suction type external spring all-plastic lotion pump according to claim 1, characterized in that: The pump body, threaded sleeve, lock cover, pressing head, main column, auxiliary column, spring and one-way ball valve are all made of PP material; the piston is made of PE material.

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