Double back-suction type all-plastic emulsion pump

Abstract

The utility model relates to the technical field of emulsion pumps, and discloses a double back-suction type all-plastic emulsion pump which is of an all-plastic structure and comprises a pump body, a pressing head, a main column, an auxiliary column, a spring, a one-way ball valve, a piston and a back-suction rod. The main column is provided with a back suction cavity located between the inner wall of the main column and the outer wall of the auxiliary column and communicated with the pressing head. The piston movably sleeves the auxiliary column in a sealing manner, is movably connected with the inner wall of the pump body in a sealing manner, and is movably connected with the inner wall of the lower end of the main column in a sealing manner to seal and close the lower end of the back-suction cavity; and the upper end of the resorption rod is movably and hermetically nested in the secondary column. According to the double back-suction type all-plastic emulsion pump, a double back-suction structure or a back-suction structure can be formed between the main column and the piston and between the auxiliary column and the back-suction rod, materials of the pressing head can be quickly sucked back or back into the back-suction cavity and the inner cavity of the auxiliary column, the back-suction space is large, the back-suction efficiency is high, and the back-suction effect is good. The problem of waste or pollution caused by residual feed liquid after the liquid is discharged from the pressing head is solved, and the use is cleaner, more environment-friendly and more sanitary.

Description

Technical Field

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

[0002] At present, lotion pumps generally include a body, screw threads, a locking cover, a push button, a main column, a secondary column, a piston, a spring and a one-way valve. The lower end of the main column is connected to the upper end of the secondary column, and the piston is arranged at the connection between the main column and the secondary column; the piston and the body are slidably matched and liquid-tight; the one-way valve is arranged at the lower end of the body, and a straw interface is arranged at the lower end of the one-way valve. The lotion flows out by pressing the push button.

[0003] Similarly, Chinese patent No. CN201720149506.8 discloses a lotion pump with an external spring, including a body, a screw thread, a locking cover, a push head, a main column, a secondary column, a piston, a spring and a one-way valve. The interface of the body passes through the center hole of the screw thread, and the annular seat plate is fitted with the top plate of the screw thread; the connecting part of the cavity of the locking cover is inserted into the connecting cavity of the body, the annular tongue and the annular groove are engaged, and the flange of the locking cover is buckled with the top plate of the screw thread; one end of the spring is plugged into the guide sleeve, and the other end is plugged into the interface at the top of the spring cavity; the main column and the guide sleeve are slidably matched and liquid-tight, the annular stop disk is matched with the lower end of the locking cover to stop, and the upper end is inserted into the interface of the push head body; the body of the push head slides and moves in and out of the cavity of the locking cover. However, the lotion pump with an external spring is similar to the existing lotion pump in that the lotion at the pressing head is poorly sucked back or reversely sucked, which easily leads to lotion residue at the pressing head, and further leads to waste of lotion at the pressing head or lotion exposure and pollution, which is not clean and hygienic. Utility Model Content

[0004] The utility model aims to overcome the problems of the prior art and provides a double back-suction type all-plastic lotion pump.

[0005] In order to achieve the above purpose, the utility model adopts the following scheme:

[0006] A double back-suction type all-plastic lotion pump, which is an all-plastic structure, includes a pump body, a pressing head, a main column, a secondary column, a spring and a one-way ball valve; the pressing head is connected to the upper end of the main column; the lower end of the main column is adaptively mounted on the upper end of the secondary column; the one-way ball valve is provided at the liquid inlet in the lower end of the pump body; the main column has a back-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;

[0007] The double back-suction all-plastic lotion pump also includes:

[0008] A 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 main column, the secondary column and the piston are reset and moved in the up and down direction of the pump body by a spring;

[0009] The upper end of the suction rod is movably sealed and nested in the auxiliary column; the lower end of the suction rod is connected to the lower end of the pump body.

[0010] The double back-suction all-plastic lotion pump also includes a screw sleeve, a gasket, a locking cover and a buckle; the screw sleeve is adapted to be mounted on the upper end of the pump body; the gasket is mounted between the screw sleeve and the pump body; the locking cover is adapted to be nested in the upper end of the pump body; the upper end of the main column is connected to the pressing head through the locking cover and the main column can be locked or unlocked by rotating the locking cover left and right; the buckle is detachably mounted on the locking cover and is located between the pressing head and the screw sleeve.

[0011] Furthermore, the main column includes an upper tube body, a middle tube body, a lower tube body and a reinforcing support bar; the upper tube body, the middle tube body and the lower tube body are sequentially connected from top to bottom;

[0012] The pressing head is connected to the inner cavity of the upper tube body by a matching sleeve; a plurality of the reinforcing support strips are arranged on the inner wall of the middle tube body at intervals around the central axis of the middle tube body; two adjacent reinforcing support strips form the back-suction cavity connecting the upper tube body and the lower tube body; 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 body to seal and close the lower end of the back-suction cavity.

[0013] Furthermore, there are 10 reinforcing support bars; the number of the suction chambers is the same as the number of the reinforcing support bars.

[0014] Furthermore, 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.

[0015] Further, the suction rod comprises a guide rod and a rod body connection seat; the secondary column has a first guide cavity, a one-way valve cavity and a second guide cavity connected from bottom to top; the upper end of the guide rod passes through the first guide cavity and can be movably sealed relative to the secondary column to pass through the one-way valve cavity and enter the second guide cavity; the lower end of the guide rod is connected to the rod body connection seat;

[0016] The lower end of the rod body connection seat is connected to the lower end of the pump body and covers the top of the one-way ball valve; the rod body connection seat has a feed hole connecting the inner cavity of the pump body and the one-way ball valve.

[0017] Furthermore, the one-way valve cavity is a valve cavity structure in the shape of a frustum of a cone.

[0018] Furthermore, the one-way ball valve includes a plastic ball and an inverted frustoconical valve seat; the inverted frustoconical valve seat has a one-way valve hole connected to the liquid inlet in the lower end of the pump body; the plastic ball can be rolled on the inverted frustoconical valve seat to open or close the one-way valve hole; the rod body connecting seat has a ball sliding cavity connected to the one-way valve hole and to the feed hole; the plastic ball can roll up and down along the ball sliding cavity.

[0019] Furthermore, a plurality of the feed holes are evenly distributed on the peripheral wall of the rod body connecting seat.

[0020] Furthermore, the double back-suction all-plastic lotion pump also includes a screw sleeve, a gasket, a locking cover and a buckle; the screw sleeve is adapted to be installed on the upper end of the pump body; the gasket is sleeved between the screw sleeve and the pump body; the locking cover is adapted to be nested in the upper end of the pump body; the upper end of the main column is connected to the pressing head through the locking cover and the locking cover is rotated left and right to lock or unlock the main column; the buckle is detachably sleeved on the locking cover and is located between the pressing head and the screw sleeve.

[0021] Furthermore, the spring is located in the pump body, the upper end of the spring is connected to the lower end of the secondary column, and the lower end of the spring is connected to the lower end of the pump body; the suction rod is embedded in the spring;

[0022] or,

[0023] The spring is located outside the pump body, and the spring is sleeved on the main column; the upper end of the spring is connected to the pressing head; the lower end of the spring is embedded in the lock cover and connected to the lower end of the lock cover.

[0024] Compared with the existing technology, the utility model has the following advantages:

[0025] 1. The utility model improves the main column, piston and suction rod on the basis of a pump body, a pressing head, a main column, a sub-column, a spring and a one-way ball valve. A suction chamber connected with the pressing head is arranged on the main column, and the piston is movably sealed to the inner wall of the lower end of the main column to seal and close the lower end of the suction chamber, and the upper end of the suction rod is movably sealed and nested in the sub-column, so that a double suction structure or reverse suction structure is formed between the main column and the piston, and between the sub-column and the suction rod, so that the material body of the pressing head can be quickly sucked back or reversely sucked into the inner cavity of the suction chamber and the sub-column, the suction space is large, the suction efficiency is high, and the problem of waste or pollution caused by residual material liquid after the pressing head discharges liquid is solved, and it is cleaner, more environmentally friendly and hygienic to use.

[0026] 2. The double-back-suction all-plastic lotion pump of the utility model is an all-plastic structure as a whole, which is lightweight and easy to carry; it has good toughness, high yield strength, and long service life; and it has a simple process, is environmentally friendly, and is easy to recycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Figure 1 It is a cross-sectional structural schematic diagram of an embodiment of the double back-suction all-plastic lotion pump of the utility model.

[0029] Figure 2 It is a three-dimensional structural schematic diagram of the main column of the utility model.

[0030] Figure 3 It is a three-dimensional structural schematic diagram of the piston of the utility model.

[0031] Figure 4 It is a three-dimensional structural schematic diagram of the suction rod of the utility model.

[0032] Figure 5 It is a cross-sectional structural schematic diagram of another embodiment of the double back-suction all-plastic lotion pump of the utility model.

[0033] The figure includes:

[0034] Pump body 1, pressing head 2, main column 3, upper tube body 31, middle tube body 32, lower tube body 33, reinforcing support strip 34, back-suction chamber 35, sub-column 4, first guide chamber 41, one-way valve chamber 42, second guide chamber 43, spring 5, one-way ball valve 6, plastic ball 61, inverted frustum-shaped valve seat 62, one-way valve hole 621, piston 7, inner sealing ring part 71, outer sealing ring part 72, sealing connection part 73, inner sealing sleeve chamber 74, upper inner ring chamber 75, back-suction rod 8, guide rod 81, rod body connecting seat 82, feed hole 821, ball sliding chamber 822, screw sleeve 9, gasket 10, lock cover 11, buckle 12. DETAILED DESCRIPTION

[0035] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] like Figures 1 to 4 As shown, a double back-suction all-plastic lotion pump is a full-plastic structure, preferably made of PP or PE material. The double back-suction all-plastic lotion pump includes a pump body 1, a pressing head 2, a main column 3, a secondary column 4, a spring 5, a one-way ball valve 6, a piston 7, a back-suction rod 8, a screw sleeve 9, a gasket 10, a lock cover 11 and a buckle 12; the pressing head 2 is connected to the upper end of the main column 3; the lower end of the main column 3 is adaptively mounted on the upper end of the secondary column 4; the one-way ball valve 6 is provided at the liquid inlet in the lower end of the pump body 1; the main column 3 has a one-way ball valve located between the inner wall of the main column 3 and the outer wall of the secondary column 4. The piston 7 is movably and sealingly sleeved on the secondary column 4 and 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 3 to seal and close the lower end of the back-suction chamber 35; the main column 3, the secondary column 4 and the piston 7 are reset and moved along the up and down directions of the pump body 1 by the spring 5; the upper end of the back-suction rod 8 is movably and sealingly nested in the secondary column 4; the lower end of the back-suction rod 8 is connected to the lower end of the pump body 1. The threaded sleeve 9 is fitted on the upper end of the pump body 1; the gasket 10 is sleeved between the threaded sleeve 9 and the pump body 1; the locking cover 11 is fitted and nested in the upper end of the pump body 1; the upper end of the main column 3 passes through the locking cover 11 and is connected to the pressing head 2 and the locking cover 11 is rotated left and right to lock or unlock the main column 3. In this way, when the main column 3 is unlocked, the pressing head 2, the main column 3, the auxiliary column 4 and the piston 7 can be moved in the up and down direction relative to the pump body 1, and the pressing head 2 can discharge liquid. The buckle 12 is detachably sleeved on the locking cover 11 and is located between the pressing head 2 and the threaded sleeve 9, and the purpose is to limit the locking of the pressing head 2 and the downward pressing movement of the pressing head 2.

[0037] When in use, remove the buckle 12, release the restrictive lock between the pressing head 2 and the screw sleeve 9, rotate the lock cover 11 left and right to adjust the position, and unlock the main column 3. At this time, the pressing head 2, the main column 3, the auxiliary column 4 and the piston 7 move in the up and down direction relative to the pump body 1, so that the pressing head 2 can discharge the liquid. When the pressing head 2 is pressed to the bottom and then released, and then the spring 5 rebounds, on the one hand, the piston 7 is movably sealed and connected with the inner wall of the lower end of the main column 3 to seal and close the lower end of the suction chamber 35. During the resetting process of the spring 5, the piston 7 and the inner wall of the lower end of the main column 3 produce a friction seal and move downward relative to each other, sucking the material at the pressing head 2 back, and quickly sucking or re-sucking the material of the pressing head 2 back into the suction chamber 35, thereby achieving the first suction or re-sucking effect; on the other hand, the suction rod The upper end movable seal of 8 is nested in the secondary column 4. At this time, during the resetting process of the spring 5, the secondary column 4 and the main column 3 move upward relative to the suction rod 8, playing a suction role similar to that of the piston 7. There is a certain suction effect, and the upper end inner cavity of the secondary column 4 gradually increases from a small volume. In the process of the expansion of this cavity, the material liquid of the pressing head 2 is sucked back downward under the action of gravity and suction, and the material body of the pressing head 2 is quickly sucked back or reversed into the inner cavity of the secondary column 4, thereby achieving a second suction or reverse suction effect. Therefore, on the basis of the pump body 1, the pressing head 2, the main column 3, the sub-column 4, the spring 5 and the one-way ball valve 6, the main column 3, the piston 7 and the back-suction rod 8 are improved. By setting a back-suction chamber 35 connected with the pressing head 2 on the main column 3, the piston 7 is movably sealed and connected to the inner wall of the lower end of the main column 3 to seal and close the lower end of the back-suction chamber 35, and the upper end of the back-suction rod 8 is movably sealed and nested in the sub-column 4, so that a double back-suction structure or back-suction structure is formed between the main column 3 and the piston 7, and between the sub-column 4 and the back-suction rod 8, so that the material body of the pressing head 2 can be quickly sucked back or back-sucked into the inner cavity of the back-suction chamber 35 and the sub-column 4. The back-suction space is large and the back-suction efficiency is high, which solves the problem of waste or pollution caused by the residual liquid after the pressing head 2 is discharged, and it is cleaner, more environmentally friendly and hygienic to use.

[0038] In this embodiment, the first back-suction or reverse-suction effect of the double back-suction all-plastic lotion pump is aimed at. The main column 3 includes an upper tube body 31, a middle tube body 32, a lower tube body 33 and a reinforcing support strip 34; the upper tube body 31, the middle tube body 32 and the lower tube body 33 are sequentially connected from top to bottom; the pressing head 2 is connected to the inner cavity of the upper tube body 31 by a matching sleeve. A plurality of the reinforcing support strips 34 are arranged on the inner wall of the middle tube body 32 at intervals around the central axis of the middle tube body 32; two adjacent reinforcing support strips 34 form the back-suction cavity 35 connecting the upper tube body 31 and the lower tube body 33; the cavity surrounded by the plurality of reinforcing support strips 34 is connected to the upper end of the secondary column 4 by a matching sleeve; the piston 7 is movably sealed to the inner wall of the lower end of the lower tube body 33 to seal and close the lower end of the back-suction cavity 35. 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 connected through the sealing connection portion 73; the inner sealing ring portion 71 has an inner sealing sleeve cavity 74 that can be movably sealed and sleeved on the lower end of the secondary column 4; 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 form an upper inner ring cavity 75 for the lower end of the main column 3 to be embedded in; when the lower end of the main column 3 is embedded in the upper inner ring cavity 75, the inner wall of the main column 3 is movably sealed and connected to the outer wall of the inner sealing ring portion 71; the outer wall of the outer sealing ring portion 72 is movably sealed and connected to the inner wall of the pump body 1. By improving the specific structure of the main column 3 and the piston 7, the upper tube body 31, the middle tube body 32, the lower tube body 33 and the reinforcing support strip 34 form the main column 3, and the main column 3 and the pressing head 2, and the main column 3 and the auxiliary column 4 are structurally stable and reliable. At the same time, a reflux cavity is formed to increase the space for back suction and back suction, which is conducive to solving the problem of waste or pollution caused by the residual liquid after the pressing head 2 discharges the liquid. At the same time, in order to achieve a better back suction or back suction effect, the piston 7 is improved by setting an inner sealing ring part 71, an outer sealing ring part 72, and an outer sealing ring part 73. The sealing ring portion 72 and the sealing connection portion 73 form a piston 7, which facilitates the discharge of liquid from the pressing head 2. At the same time, the lower end of the main column 3 is embedded in the upper inner ring cavity 75, and the inner wall of the main column 3 is movably sealed and connected to the outer wall of the inner sealing ring portion 71. In this way, during the resetting process of the spring 5, a friction seal will occur between the piston 7 and the inner wall of the lower end of the main column 3, and the material body at the pressing head 2 will be sucked back, and the material body of the pressing head 2 will be quickly sucked back or reversed into the re-suction cavity 35, thereby achieving the first re-suction or reverse suction effect.

[0039] In order to make the connection between the secondary column 4 and the main column 3 more stable, the number of the re-sucking chambers 35 is reasonably designed to accelerate the re-sucking or reverse suction of the material body of the pressing head 2 into the re-sucking chamber 35, so as to achieve a better first-level re-sucking or reverse suction effect. There are 10 reinforcing support bars 34; the number of the re-sucking chambers 35 is the same as that of the reinforcing support bars 34. Of course, the number of reinforcing support bars 34 can be reasonably designed according to demand, and is not limited to 10 reinforcing support bars 34. The shape of the reinforcing support bar 34 is a long strip, and the shape can be reasonably designed according to demand, so that a reflux chamber can be formed and the secondary column 4 can be locked and fixed.

[0040] In this embodiment, in order to achieve the second back-suction or reverse-suction effect of the double-back-suction all-plastic lotion pump, the back-suction rod 8 includes a guide rod 81 and a rod body connecting seat 82; the sub-column 4 has a first guide cavity 41, a one-way valve cavity 42 and a second guide cavity 43 connected from bottom to top; the upper end of the guide rod 81 passes through the first guide cavity 41 and can be movably sealed relative to the sub-column 4 to pass through the one-way valve cavity 42 and enter the second guide cavity 43; the lower end of the guide rod 81 is connected to the rod body connecting seat 82; the lower end of the rod body connecting seat 82 is connected to the lower end of the pump body 1 and covers the top of the one-way ball valve 6; the rod body connecting seat 82 has a feed hole 821 connecting the inner cavity of the pump body 1 and the one-way ball valve 6. By improving the specific structure of the secondary column 4 and the piston 7, the guide rod 81 and the rod body connecting seat 82 are formed into a return suction rod 8, and the inner cavity of the secondary column 4 is improved, and a one-way valve cavity 42 is designed, so that the upper end of the guide rod 81 can be movably sealed to pass through the one-way valve cavity 42, and liquid can only be discharged from the bottom to the top in one direction. In this way, during the resetting process of the spring 5, the secondary column 4 and the main column 3 move upward relative to the return suction rod 8, and the guide rod 81 has a certain suction effect in the one-way valve cavity 42, similar to the suction effect of the piston 7. The inner cavity at the upper end of the secondary column 4 gradually increases from a small volume. In the process of the expansion of this cavity, the material liquid of the pressing head 2 is sucked back downward under the action of gravity and suction, and the material body of the pressing head 2 is quickly sucked back or reversely sucked into the inner cavity of the secondary column 4, thereby achieving a second level of back suction or reverse suction effect.

[0041] Preferably, the one-way valve chamber 42 is a frustum-shaped valve chamber structure, which has a simple structure and, when combined with the suction rod 8, achieves a good suction or reverse suction effect.

[0042] In order to better utilize the one-way feeding of the one-way ball valve 6, the one-way ball valve 6 includes a plastic ball 61 and an inverted frustum-shaped valve seat 62; the inverted frustum-shaped valve seat 62 has a one-way valve hole 621 connected to the liquid inlet in the lower end of the pump body 1; the plastic ball 61 can be rolled on the inverted frustum-shaped valve seat 62 to open or close the one-way valve hole 621; the rod body connecting seat 82 has a ball sliding cavity 822 connected to the one-way valve hole 621 and to the feed hole 821; the plastic ball 61 can roll up and down along the ball sliding cavity 822. By setting the ball sliding cavity 822 and the one-way valve hole 621 on the rod connecting seat 82, during the process of pressing the pressing head 2, the plastic ball 61 can move along the up and down directions of the ball sliding cavity 822, which is convenient for opening or closing the one-way valve hole 621 on the inverted frustum-shaped valve seat 62, and is conducive to the material body entering the ball sliding cavity 822 and the one-way valve hole 621 from the one-way valve hole 621, and then entering the inner cavity of the pump body 1, thereby achieving a good feeding effect.

[0043] In order to achieve a better feeding effect and facilitate the material body to enter the pump body 1, a plurality of the feeding holes 821 are evenly distributed on the peripheral wall of the rod body connecting seat 82.

[0044] In this embodiment, the spring 5 is located in the pump body 1, the upper end of the spring 5 is connected to the lower end of the sub-column 4, and the lower end of the spring 5 is connected to the lower end of the pump body 1; the suction rod 8 is embedded in the spring 5, the position of the spring 5 is reasonably designed, the structure is simple, and the use of the double suction type all-plastic lotion pump is convenient.

[0045] In another embodiment, if Figure 5 As shown, the spring 5 is located outside the pump body 1, and the spring 5 is sleeved on the main column 3; the upper end of the spring 5 is connected to the pressing head 2; the lower end of the spring 5 is embedded in the locking cover 11 and connected to the lower end of the locking cover 11. The position of the spring 5 is designed in this way, the structure is simple, and the use of the double back-suction all-plastic lotion pump is also convenient.

[0046] The principle of the double back-suction type all-plastic lotion pump is as follows:

[0047] When in use, remove the buckle 12, release the restrictive lock between the pressing head 2 and the screw sleeve 9, rotate the lock cover 11 left and right to adjust the position, and unlock the main column 3. At this time, the pressing head 2, the main column 3, the auxiliary column 4 and the piston 7 move in the up and down direction relative to the pump body 1, so that the pressing head 2 can discharge the liquid. When the pressing head 2 is pressed to the bottom and then released, and then the spring 5 rebounds, on the one hand, the piston 7 is movably sealed and connected with the inner wall of the lower end of the main column 3 to seal and close the lower end of the suction chamber 35. During the resetting process of the spring 5, the piston 7 and the inner wall of the lower end of the main column 3 produce a friction seal and move downward relative to each other, sucking the material at the pressing head 2 back, and quickly sucking or re-sucking the material of the pressing head 2 back into the suction chamber 35, thereby achieving the first suction or re-sucking effect; on the other hand, the suction rod The upper end movable seal of 8 is nested in the secondary column 4. At this time, during the resetting process of the spring 5, the secondary column 4 and the main column 3 move upward relative to the suction rod 8, playing a suction role similar to that of the piston 7. There is a certain suction effect, and the upper end inner cavity of the secondary column 4 gradually increases from a small volume. In the process of the expansion of this cavity, the material liquid of the pressing head 2 is sucked back downward under the action of gravity and suction, and the material body of the pressing head 2 is quickly sucked back or reversed into the inner cavity of the secondary column 4, thereby achieving a second suction or reverse suction effect.

[0048] In summary, the embodiment of the utility model provides a double back-suction type all-plastic lotion pump, wherein the double back-suction type all-plastic lotion pump has the following advantages:

[0049] 1. On the basis of the pump body 1, the pressing head 2, the main column 3, the sub-column 4, the spring 5 and the one-way ball valve 6, the main column 3, the piston 7 and the back-suction rod 8 are improved. By setting a back-suction chamber 35 connected with the pressing head 2 on the main column 3, the piston 7 is movably sealed and connected to the inner wall of the lower end of the main column 3 to seal and close the lower end of the back-suction chamber 35, and the upper end of the back-suction rod 8 is movably sealed and nested in the sub-column 4, so that a double back-suction structure or back-suction structure is formed between the main column 3 and the piston 7, and between the sub-column 4 and the back-suction rod 8, so that the material body of the pressing head 2 can be quickly sucked back or back-sucked into the inner cavity of the back-suction chamber 35 and the sub-column 4, the back-suction space is large, the back-suction efficiency is high, and the problem of waste or pollution caused by the residual material liquid after the pressing head 2 is discharged is solved, and it is cleaner, more environmentally friendly and hygienic to use.

[0050] Second, the double back-suction all-plastic lotion pump is an all-plastic structure as a whole, which is lightweight and easy to carry; it has good toughness, high yield strength, and long service life; and the process is simple, environmentally friendly, and easy to recycle.

[0051] 3. The double back-suction all-plastic lotion pump can lock or unlock the main column 3 by rotating the lock cover 11 left and right, avoiding contamination caused by accidentally pressing the pressing head 2 to discharge the liquid, and is clean and hygienic for travel.

[0052] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A double back-suction all-plastic lotion pump, which is an all-plastic structure, including a pump body, a pressing head, a main column, a secondary column, a spring and a one-way ball valve; the pressing head is connected to the upper end of the main column; the lower end of the main column is adaptively mounted on the upper end of the secondary column; the one-way ball valve is provided at the liquid inlet in the lower end of the pump body; characterized in that, 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 double back-suction all-plastic lotion pump also includes: A 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 main column, the secondary column and the piston are reset and moved in the up and down direction of the pump body by a spring; The upper end of the suction rod is movably sealed and nested in the auxiliary column; the lower end of the suction rod is connected to the lower end of the pump body.

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

3. The double-suction all-plastic lotion pump according to claim 2, characterized in that: The number of the reinforcing support strips is 10; the number of the suction chambers is the same as the number of the reinforcing support strips.

4. The double back-suction all-plastic lotion pump according to claim 1 or 2, 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.

5. The double-suction all-plastic lotion pump according to claim 1, characterized in that: The suction rod comprises a guide rod and a rod body connection seat; the secondary column comprises a first guide cavity, a one-way valve cavity and a second guide cavity which are connected from bottom to top; the upper end of the guide rod passes through the first guide cavity and can be movably sealed relative to the secondary column to pass through the one-way valve cavity and enter the second guide cavity; the lower end of the guide rod is connected to the rod body connection seat; The lower end of the rod body connection seat is connected to the lower end of the pump body and covers the top of the one-way ball valve; the rod body connection seat has a feed hole connecting the inner cavity of the pump body and the one-way ball valve.

6. The double back-suction all-plastic lotion pump according to claim 5, characterized in that: The one-way valve cavity is a valve cavity structure in the shape of a truncated cone.

7. The double-suction all-plastic lotion pump according to claim 5, characterized in that: The one-way ball valve includes a plastic ball and an inverted frustum-shaped valve seat; the inverted frustum-shaped valve seat has a one-way valve hole connected to the liquid inlet in the lower end of the pump body; the plastic ball can be rolled on the inverted frustum-shaped valve seat to open or close the one-way valve hole; the rod body connecting seat has a ball sliding cavity connected to the one-way valve hole and the feed hole; the plastic ball can roll up and down along the ball sliding cavity.

8. The double back-suction all-plastic lotion pump according to claim 5, characterized in that: A plurality of the feed holes are evenly distributed on the peripheral wall of the rod body connecting seat.

9. The double back-suction all-plastic lotion pump according to claim 1, characterized in that: It also includes a screw sleeve, a gasket, a locking cover and a buckle; the screw sleeve is adapted to be mounted on the upper end of the pump body; the gasket is mounted between the screw sleeve and the pump body; the locking cover is adapted to be nested in the upper end of the pump body; the upper end of the main column is connected to the pressing head through the locking cover and the main column can be locked or unlocked by rotating the locking cover left and right; the buckle is detachably mounted on the locking cover and is located between the pressing head and the screw sleeve.

10. The double back-suction all-plastic lotion pump according to claim 9, characterized in that: The spring is located in the pump body, the upper end of the spring is connected to the lower end of the auxiliary column, and the lower end of the spring is connected to the lower end of the pump body; the suction rod is embedded in the spring; or, The spring is located outside the pump body, and the spring is sleeved on the main column; the upper end of the spring is connected to the pressing head; the lower end of the spring is embedded in the lock cover and connected to the lower end of the lock cover.

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