A fully plastic lotion pump

Abstract

The present invention discloses an all-plastic lotion pump, comprising: a main body, wherein a pump chamber is provided inside the main body, and a liquid inlet tube is provided at the bottom of the main body; a one-way valve assembly is provided on the inner bottom surface of the main body, capable of connecting or disconnecting the pump chamber from the liquid inlet tube, and an installation space is defined between the one-way valve assembly and the inner peripheral wall of the main body; a locking bottle cap is provided on the upper part of the main body; a liquid outlet pipe assembly is movably provided through the locking bottle cap, wherein a liquid discharge channel is provided inside the locking bottle cap, which is capable of connecting with the pump chamber and can be raised and lowered relative to the main body to input the lotion in the pump chamber into the liquid discharge channel; and a plastic spring is located within the installation space, with the two ends of the plastic spring respectively abutting the lower part of the liquid outlet pipe assembly and the inner bottom surface of the main body. The installation space provides ample space for the plastic spring, and plastic springs of different diameters can be selected according to the viscosity difference of the liquid. It also broadens the diameter range of the applicable locking bottle cap and screw cap, thereby improving the versatility of the all-plastic lotion pump.

Description

Technical Field

[0001] The invention relates to an all-plastic emulsion pump. Background Art

[0002] Currently, a typical lotion pump includes a main body, a piston disposed within the main body, and a liquid discharge tube assembly that is movable and movable within the main body and in conjunction with the piston. The upper portion of the main body is provided with a bottle lock cap that sleeves onto the exterior of the liquid discharge tube assembly. A push button that is movable and movable relative to the bottle lock cap is connected to the upper portion of the liquid discharge tube assembly. An elastic member is provided between the push button and the bottle lock cap to allow the push button and the liquid discharge tube assembly to return to their original position.

[0003] To reduce costs and improve environmental protection, some existing lotion pumps use plastic springs as their elastic members. These springs have larger radial dimensions and a larger compressed volume than conventional metal springs. However, the limited space between the bottle cap and the push-button assembly limits the available plastic springs, making it impossible to select springs of varying diameters to accommodate varying liquid viscosities. Furthermore, the larger diameter of the bottle cap necessitates the correspondingly larger radial dimensions of the main body, piston, and liquid outlet tube assembly, increasing costs and limiting their applicability.

[0004] Furthermore, the push button has a first angular position and a second angular position relative to the bottle cap. When the push button is in the first angular position, the push button can move up and down relative to the bottle cap. When the push button is in the second angular position, the push button cannot move downward relative to the bottle cap, thereby preventing lotion leakage during transportation. However, the lotion pump structure described above requires a large space between the bottle cap and the push button. The support strength at the contact point between the push button and the bottle cap is insufficient. Therefore, the push button is easily moved downward relative to the bottle cap after being impacted by external forces, resulting in leakage. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fully plastic lotion pump that can be used with plastic springs and locking bottle caps of various diameters and has a wide range of applications.

[0006] According to an embodiment of the present invention, an all-plastic lotion pump includes: a main body, which is provided with a pump chamber inside, and a liquid drainage tube is provided at the bottom of the main body; a one-way valve assembly is provided on the inner bottom surface of the main body, which can connect or isolate the pump chamber and the liquid drainage tube, and an installation space is defined between the one-way valve assembly and the inner peripheral wall of the main body; a locking bottle cover is provided on the upper part of the main body; a liquid discharge pipe group is movably provided through the locking bottle cover, and is provided with a discharge channel inside the liquid discharge pipe that can be connected with the pump chamber, and can be raised and lowered relative to the main body to input the lotion in the pump chamber into the discharge channel; a plastic spring is located within the installation space, and the two ends of the plastic spring respectively abut the lower part of the liquid discharge pipe group and the inner bottom surface of the main body.

[0007] The all-plastic lotion pump according to the embodiment of the present invention has at least the following beneficial effects:

[0008] The above all-plastic lotion pump is provided with a one-way valve assembly on the inner bottom surface of the body. The inner peripheral wall of the body and the one-way valve assembly form an installation space for accommodating a plastic spring. The two ends of the plastic spring are respectively abutted against the lower part of the liquid outlet pipe group and the inner bottom surface of the body. The installation space provides ample space for the plastic spring. Plastic springs of different diameters can be selected according to the viscosity difference of the liquid. It also broadens the diameter range of the applicable lock bottle cap and screw cap, thereby improving the versatility of the all-plastic lotion pump.

[0009] In some embodiments of the present invention, the liquid outlet pipe group includes a first tube body movably provided in the locking bottle cap and a second tube body provided in the first tube body and extending downward. A piston is movably provided in the body to cooperate with the inner circumferential wall of the pump chamber. The piston is located between the lower end of the first tube body and the lower part of the second tube body. The first tube body can drive the piston to descend to open the discharge channel, or the second tube body can drive the piston to rise to close the discharge channel.

[0010] In some embodiments of the present invention, the bottle cap is movable and lifting and is provided with a pressing head connected to the first tube body, the side wall of the main body is penetrated by a gas-supply hole, and a fluid channel that can be connected to the gas-supply hole is provided between the bottle cap, the first tube body and the pressing head, and the piston includes a mounting ring portion mounted on the outside of the second tube body, a sealing ring portion provided on the outer periphery of the mounting ring portion, and an arc-shaped sealing ring located on the outer periphery of the sealing ring portion, the vertical cross-section of the arc-shaped sealing ring is hyperbolic, and the upper and lower ends of the arc-shaped sealing ring are elastically abutted against the inner circumferential wall of the main body respectively, and when the piston moves to the point where the gas-supply hole is located between the upper and lower ends of the piston, the sealing ring portion abuts against the lower part of the bottle cap to separate the gas-supply hole from the fluid channel.

[0011] In some embodiments of the present invention, a circular plate portion is provided at the lower portion of the second tube body, a circular sleeve portion is provided at the lower end surface of the circular plate portion and a circular sleeve portion is extended downwardly, and the upper end of the plastic spring is sleeved outside the circular sleeve portion and abuts against the lower end surface of the circular plate portion.

[0012] In some embodiments of the present invention, a push head that can rotate around the axis of the first tube body is provided on the upper part of the first tube body, and a rotating lock structure is provided between the push head and the bottle lock cover, and the rotating lock structure can allow or prevent the push head from moving up and down relative to the bottle lock cover.

[0013] In some embodiments of the present invention, the rotating lock structure includes a stopping groove and a movable slot provided on the lock bottle cap, the stopping groove and the movable slot are distributed circumferentially around the axis direction of the first tube, and the button is provided with a coupling portion that can cooperate with the stopping groove or the movable slot.

[0014] In some embodiments of the present invention, the bottle lock cap includes a first inner ring portion and a first outer ring portion arranged outside the first inner ring portion, the stopping groove is arranged at the upper end of the first inner ring portion, the movable slot extends downward along the upper end of the first inner ring portion, the button head is provided with a second inner ring portion and a second outer ring portion arranged outside the second inner ring portion, an annular guide slot for movable lifting of the second outer ring portion is defined between the first inner ring portion and the first outer ring portion, the coupling portion is a connecting rib connected between the second inner ring portion and the second outer ring portion, and the connecting rib can abut against the stopping groove or extend into the movable slot.

[0015] In some embodiments of the present invention, the one-way valve assembly includes a one-way valve seat formed on the inner bottom surface of the body and extending upward, the one-way valve seat has a vertical channel, the liquid inlet tube is inserted into the lower part of the vertical channel, the pump chamber is connected to the upper part of the vertical channel, and a one-way valve core is movably provided in the vertical channel for blocking or opening the vertical channel.

[0016] In some embodiments of the present invention, the outer peripheral wall of the one-way valve seat and the inner peripheral wall of the body are both cylindrical surfaces, and there is a gap between the plastic spring and the one-way valve seat, or between the plastic spring and the body.

[0017] In some embodiments of the present invention, the interior of the vertical channel has a truncated cone-shaped sleeve that is larger at the top and smaller at the bottom and a plurality of blocking members located above the truncated cone-shaped sleeve. A limiting space for the movement of the one-way valve core is defined between all the blocking members and the truncated cone-shaped sleeve.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 This is a schematic structural diagram of an embodiment of the all-plastic lotion pump of the present invention in an unpressed state;

[0021] Figure 2 for Figure 1A schematic diagram of the structure of the embodiment in a pressed state;

[0022] Figure 3 It is a schematic diagram of the structure in which the bottle lock cap and the button are separated;

[0023] Figure 4 for Figure 3 A structural diagram from another perspective. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientations, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] See also Figure 1 and Figure 2, an all-plastic lotion pump of the present invention comprises: a body 100, which is provided with a pump chamber 110 inside, and a liquid guide tube 200 is provided at the bottom of the body 100; a one-way valve assembly 300, which is provided on the inner bottom surface of the body 100 and can connect or isolate the pump chamber 110 with the liquid guide tube 200, and an installation space is defined between the one-way valve assembly 300 and the inner peripheral wall of the body 100; a bottle lock cap 400, which is provided on the upper part of the body 100; a liquid discharge pipe group 500, which is movably provided on the bottle lock cap 400 and has a discharge channel 501 inside thereof that can communicate with the pump chamber 110, and can be raised and lowered relative to the body 100 to input the lotion in the pump chamber 110 into the discharge channel 501; a plastic spring 600, which is located within the installation space, and the two ends of the plastic spring 600 respectively abut against the lower part of the liquid discharge pipe group 500 and the inner bottom surface of the body 100.

[0029] The above all-plastic lotion pump is provided with a one-way valve assembly 300 on the inner bottom surface of the body 100. The inner peripheral wall of the body 100 and the one-way valve assembly 300 form an installation space for accommodating a plastic spring 600. The two ends of the plastic spring 600 abut against the lower portion of the liquid outlet tube assembly 500 and the inner bottom surface of the body 100, respectively. The installation space provides ample space for the plastic spring 600, and plastic springs 600 of different diameters can be selected according to the viscosity of the liquid. In addition, the outer sleeve of the locking bottle cap 400 is provided with a screw cap 900 located between the upper end of the body 100 and the locking bottle cap 400. The screw cap 900 is used to thread the bottle body. The plastic spring 600 is arranged in the installation space, so that the all-plastic lotion pump can use a smaller diameter locking bottle cap 400 and screw cap 900, thereby widening the diameter range of the applicable locking bottle cap 400 and screw cap 900, thereby improving the versatility of the all-plastic lotion pump.

[0030] See also Figure 1 and Figure 2In some embodiments of the present invention, the liquid outlet tube assembly 500 includes a first tube body 510 movably inserted into the bottle lock cap 400 and a second tube body 520 inserted into the first tube body 510 and extending downward. A piston 700 is movably provided in the body 100 to cooperate with the inner circumferential wall of the pump chamber 110. The piston 700 is located between the lower end of the first tube body 510 and the lower part of the second tube body 520. The first tube body 510 can drive the piston 700 to descend to open the discharge channel 501, or the second tube body 520 can drive the piston 700 to rise to close the discharge channel 501. It should be noted that the internal channel of the first tube body 510 and the internal channel of the second tube body 520 together constitute at least part of the discharge channel 501. The lower part of the second tube body 520 is provided with a communication port that can connect the pump chamber 110 with the internal channel of the second tube body 520. When the all-plastic lotion pump is not subjected to external force, the lower part of the second tube body 520 presses upward against the piston 700 to separate the communication port from the pump chamber 110. At this time, the lotion in the pump chamber 110 cannot enter the discharge channel 501. When the user applies pressure to the liquid outlet tube assembly 500, the lower end of the first tube body 510 moves downward for a certain distance and presses against the piston 700. There is a height gap between the piston 700 and the lower part of the second tube body 520 that can connect the communication port to the pump chamber 110. As the piston 700 continues to move downward, the internal pressure of the pump chamber 110 is greater than the pressure in the discharge channel 501, thereby discharging the lotion outward through the discharge channel 501. The path for lotion discharge can be found in Figure 1 and Figure 2 The liquid outlet pipe assembly 500 is composed of a first tube body 510 and a second tube body 520 that are separately provided, which helps to reduce the difficulty of production and processing and is also convenient for assembling the piston 700 between the lower end of the first tube body 510 and the lower part of the second tube body 520.

[0031] See also Figure 1 In some embodiments of the present invention, the bottle lock cap 400 is movably lifted and provided with a pressing head 800 connected to the first tube body 510, and the side wall of the main body 100 is penetrated with a gas filling hole 120. A fluid channel 20 that can communicate with the gas filling hole 120 is provided between the bottle lock cap 400, the first tube body 510, and the pressing head 800. The piston 700 includes a mounting ring portion 710 sleeved on the outside of the second tube body 520, a sealing ring portion 720 provided on the outer periphery of the mounting ring portion 710, and an arc-shaped sealing ring 730 located on the outer periphery of the sealing ring portion 720. The vertical cross-section of the arc-shaped sealing ring 730 is hyperbolic, and the upper and lower ends of the arc-shaped sealing ring 730 elastically abut against the inner circumferential wall of the main body 100 respectively. When the piston 700 moves to the point where the gas filling hole 120 is located between the upper and lower ends of the piston 700, the sealing ring portion 720 abuts against the lower portion of the bottle lock cap 400, thereby separating the gas filling hole 120 from the fluid channel 20.

[0032] The path for the emulsion to leak outward from the air supply hole 120 through the fluid channel 20 is shown in FIG. Figure 1 As shown by the dotted line on the side, it should be noted that, see Figure 1 and Figure 2 As the pressing head 800 drives the first tube 510 upward, the one-way valve assembly 300 connects the pump chamber 110 with the liquid inlet tube 200, reducing the pressure in the bottle body outside the body 100. External gas can then flow along the fluid passage 20 and into the bottle body through the air-injection hole 120, preventing the bottle from deflation. When the pressing head 800, the liquid outlet tube assembly 500, and the piston 700 are returned to a position where the pressing head 800 is not pressed, the air-injection hole 120 is located between the upper and lower ends of the piston 700 to prevent the emulsion outside the body 100 from being drawn into the body 100 through the air-injection hole 120. Simultaneously, the sealing ring portion 720 abuts against the lower portion of the bottle lock cap 400, isolating the air-injection hole 120 from the fluid passage 20, thereby preventing the emulsion from entering the fluid passage 20 and causing emulsion leakage.

[0033] See also Figure 1 and Figure 2 In some embodiments of the present invention, in order to limit the plastic spring 600 and prevent the plastic spring 600 from moving along its radial direction, a circular plate portion 521 is provided at the lower portion of the second tube body 520, and a circular sleeve portion 522 extending downward is provided on the lower end surface of the circular plate portion 521. The upper end of the plastic spring 600 is sleeved on the outside of the circular sleeve portion 522 and abuts against the lower end surface of the circular plate portion 521.

[0034] See also Figure 1 and Figure 2 In some embodiments of the present invention, a push head 800 is provided on the upper portion of the first tube 510 and is rotatable about the axis of the first tube 510. A rotary lock structure is provided between the push head 800 and the bottle lock cap 400. The rotary lock structure can allow or prevent the push head 800 from moving up and down relative to the bottle lock cap 400. It should be noted that the rotary lock structure has a locked state and an unlocked state. When in the locked state, the push head 800 cannot move up and down relative to the bottle lock cap 400, facilitating storage or transportation of the all-plastic lotion pump. When in the unlocked state, the push head 800 can move up and down relative to the bottle lock cap 400, allowing the all-plastic lotion pump to be pressed and used normally.

[0035] See also Figure 3 and Figure 4In some embodiments of the present invention, the rotary lock structure includes a retaining groove 11 and a movable slot 12 provided on the bottle lock cap 400. The retaining groove 11 and the movable slot 12 are circumferentially distributed around the axis of the first tube. The pressing head 800 is provided with a coupling portion 13 that can cooperate with the retaining groove 11 or the movable slot 12. It is understandable that when the coupling portion 13 cooperates with the retaining groove 11, the pressing head 800 cannot move downward. When the pressing head 800 is rotated a certain angle so that the coupling portion 13 is aligned with the movable slot 12, the pressing head 800 can move up and down on the bottle lock cap 400. During this process, the coupling portion 13 slides up and down in the movable slot 12.

[0036] See also Figure 3 and Figure 4 In some embodiments of the present invention, the bottle lock cap 400 includes a first inner ring portion 410 and a first outer ring portion 420 arranged outside the first inner ring portion 410, a stopping groove 11 is arranged at the upper end of the first inner ring portion 410, and a movable slot 12 extends downward along the upper end of the first inner ring portion 410. The pressing head 800 is provided with a second inner ring portion 810 and a second outer ring portion 820 arranged outside the second inner ring portion 810. An annular guide slot for the second outer ring portion 820 to be movable and raised is defined between the first inner ring portion 410 and the first outer ring portion 420. The coupling portion 13 is a connecting rib connected between the second inner ring portion 810 and the second outer ring portion 820. The connecting rib can rest on the stopping groove 11 or extend into the movable slot 12. The connecting ribs extend radially along the second inner ring portion 810. When the connecting ribs abut against the retaining groove 11, the connecting ribs intersect the first inner ring portion 410 orthogonally to form a cross-support structure. This effectively supports the bottle cap 400 against the push head 800. When the rotary lock structure is locked, the push head 800 is unlikely to move downward relative to the bottle cap 400. In this embodiment, two connecting ribs are provided, and the two connecting ribs are located in the same direction, further enhancing the support strength of the bottle cap 400 against the push head 800.

[0037] See also Figure 1 and Figure 2 In some embodiments of the present invention, the one-way valve assembly 300 includes a one-way valve seat 310 formed on the inner bottom surface of the body 100 and extending upward. The one-way valve seat 310 defines a vertical channel. The liquid introduction tube 200 is inserted into the lower portion of the vertical channel, and the pump chamber 110 communicates with the upper portion of the vertical channel. A one-way valve core 320 is movably disposed within the vertical channel, capable of blocking or opening the vertical channel. It should be noted that the one-way valve seat 310 is integrally injection-molded with the inner bottom surface of the body 100, simplifying the assembly process. The placement of the one-way valve core 320 within the one-way valve seat 310 facilitates the compactness of the all-plastic lotion pump.

[0038] In some embodiments of the present invention, the outer peripheral wall of the one-way valve seat 310 and the inner peripheral wall of the body 100 are both cylindrical surfaces, and there is a gap between the plastic spring 600 and the one-way valve seat 310, or between the plastic spring 600 and the body 100, to prevent the plastic spring 600 from interfering with the body 100 or the one-way valve seat 310 during the telescopic movement.

[0039] See also Figure 1 and Figure 2 In some embodiments of the present invention, the vertical channel includes a truncated cone-shaped sleeve 330 that is larger at the top and smaller at the bottom, and several blocking members 340 positioned above the truncated cone-shaped sleeve 330. A confined space is defined between all blocking members 340 and the truncated cone-shaped sleeve 330 for movement of the one-way valve core 320. In this embodiment, the one-way valve core 320 is a plastic sphere. When the sphere moves upward, it abuts against the blocking members 340, opening the vertical channel and thus replenishing the lotion. When the sphere moves downward, it abuts against the nozzle of the truncated cone-shaped sleeve 330, sealing the vertical channel. The above one-way valve assembly 300 has a simple structure and is easy to use.

[0040] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A fully plastic lotion pump, characterized in that: include: A main body (100) is provided with a pump chamber (110) therein, and a liquid guide tube (200) is provided at the bottom of the main body (100); a one-way valve assembly (300) disposed on the inner bottom surface of the body (100) and capable of connecting or disconnecting the pump chamber (110) and the liquid inlet tube (200); an installation space is defined between the one-way valve assembly (300) and the inner peripheral wall of the body (100); A bottle lock cap (400) is provided on the upper portion of the body (100); a liquid outlet pipe assembly (500) movably provided on the bottle lock cap (400), having a liquid discharge passage (501) therein that is communicable with the pump chamber (110), and being movable relative to the body (100) to transfer the emulsion in the pump chamber (110) into the liquid discharge passage (501); A plastic spring (600) is located within the installation space, and the two ends of the plastic spring (600) are respectively in contact with the lower part of the liquid outlet pipe group (500) and the inner bottom surface of the body (100); the liquid outlet pipe group (500) includes a first tube body (510) movably provided in the locking bottle cap (400) and a second tube body (520) provided in the first tube body (510) and extending downward, and a piston (700) is movably provided in the body (100) and matched with the inner peripheral wall of the pump chamber (110), and the piston (700) is located between the lower end of the first tube body (510) and the lower part of the second tube body (520), and the first tube body (510) can drive the The piston (700) descends to open the discharge channel (501), or the second tube (520) can drive the piston (700) to rise to close the discharge channel (501); the lower part of the second tube (520) is provided with a circular plate portion (521), the lower end surface of the circular plate portion (521) is provided with a circular ring portion (522) extending downward, the upper end of the plastic spring (600) is sleeved on the outside of the circular ring portion (522) and abuts against the lower end surface of the circular plate portion (521); the upper part of the first tube (510) is provided with a pressing head (800) that can rotate around the axis direction of the first tube (510), and the pressing head (800) and the locking bottle cap (400) are in contact with each other. A rotating lock structure is provided between the first and second tube bodies, and the rotating lock structure can allow or prevent the pressing head (800) from moving up and down relative to the locking bottle cover (400); the rotating lock structure includes a stop groove (11) and a movable slot (12) provided on the locking bottle cover (400), the stop groove (11) and the movable slot (12) are distributed circumferentially around the axis direction of the first tube body, and the pressing head (800) is provided with a joint portion (13) capable of cooperating with the stop groove (11) or the movable slot (12); the locking bottle cover (400) includes a first inner ring portion (410) and a first outer ring portion (420) provided outside the first inner ring portion (410), the stop groove (11) and the movable slot (12) are arranged on the first tube body. ) is arranged at the upper end of the first inner ring part (410), the movable slot (12) extends downward along the upper end of the first inner ring part (410), the pressing head (800) is provided with a second inner ring part (810) and a second outer ring part (820) arranged outside the second inner ring part (810), an annular guide slot for the second outer ring part (820) to be movable and raised is defined between the first inner ring part (410) and the first outer ring part (420), the coupling part (13) is a connecting rib connected between the second inner ring part (810) and the second outer ring part (820), and the connecting rib can abut on the stopping groove (11) or extend into the movable slot (12).

2. The all-plastic lotion pump according to claim 1, characterized in that: The bottle lock cap (400) is movable and liftable and is provided with a pressing head (800) connected to the first tube body (510); a gas-replenishing hole (120) is penetrated through the side wall of the body (100); a fluid channel (20) capable of communicating with the gas-replenishing hole (120) is provided between the bottle lock cap (400), the first tube body (510), and the pressing head (800); the piston (700) includes a mounting ring portion (710) sleeved on the outside of the second tube body (520), and a sealing ring portion (720) provided on the outer periphery of the mounting ring portion (710). , and an arc-shaped sealing ring (730) located on the outer periphery of the sealing ring portion (720), the vertical cross-section of the arc-shaped sealing ring (730) is hyperbolic, and the upper and lower ends of the arc-shaped sealing ring (730) elastically abut against the inner circumferential wall of the body (100), and when the piston (700) moves to the point where the air-replenishing hole (120) is located between the upper and lower ends of the piston (700), the sealing ring portion (720) abuts against the lower portion of the bottle lock cap (400) to separate the air-replenishing hole (120) from the fluid channel (20).

3. The all-plastic lotion pump according to claim 1, characterized in that: The one-way valve assembly (300) includes a one-way valve seat (310) formed on the inner bottom surface of the body (100) and extending upward, the one-way valve seat (310) has a vertical channel, the liquid guide tube (200) is inserted into the lower part of the vertical channel, the pump chamber (110) is connected to the upper part of the vertical channel, and a one-way valve core (320) is movably provided in the vertical channel to block or open the vertical channel.

4. The all-plastic lotion pump according to claim 3, characterized in that: The outer peripheral wall of the one-way valve seat (310) and the inner peripheral wall of the body (100) are both cylindrical surfaces, and there is a gap between the plastic spring (600) and the one-way valve seat (310), or between the plastic spring (600) and the body (100).

5. The all-plastic lotion pump according to claim 3, characterized in that: The interior of the vertical channel comprises a truncated cone-shaped sleeve (330) that is larger at the top and smaller at the bottom, and a plurality of blocking members (340) located above the truncated cone-shaped sleeve (330), wherein a limiting space for the one-way valve core (320) to move is defined between all the blocking members (340) and the truncated cone-shaped sleeve (330).

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