Foam pump and packaging bottle with easy replacement of liquid cartridge

Abstract

The utility model relates to foaming pump technical field, concretely is a kind of foaming pump and packing bottle of liquid cylinder convenient to replace. Foaming pump convenient to replace liquid cylinder includes pump head, its inside is equipped with the through discharge passage;Air cylinder unit, it is detachably connected in the bottom of pump head, air cylinder unit has a gas inlet chamber in it;Movable assembly, it is set in gas inlet chamber, movable assembly is used to communicate or close discharge passage and gas inlet chamber;Movable assembly includes the pull rod that moves up and down along gas inlet chamber, the top end of piston is detachably inserted in the bottom end of pull rod;Liquid cylinder unit, it is detachably clamped in the bottom of air cylinder unit, liquid cylinder unit has a liquid inlet chamber in it, the bottom end of piston is movably inserted in the inner wall of liquid cylinder unit, movable assembly is also used to communicate or close discharge passage and liquid inlet chamber. The foaming pump of the scheme only needs to replace piston, liquid cylinder unit from bottom, can realize different pump output requirement, and the assembly of foaming pump whole is simplified, and production cycle is shortened.

Description

Technical Field

[0001] This utility model relates to the field of foam pump technology, specifically to a foam pump and packaging bottle that facilitates the replacement of the liquid cylinder. Background Technology

[0002] To change the pump output of commercially available foam pumps, the lower half of the pump head's liquid cylinder and its matching piston rod need to be replaced. As shown in patent CN202421843516.8, "An External Spring Foam Pump," the existing technology uses a single integrated structure for the air cylinder and liquid cylinder; and after the upper air cylinder structure and the lower liquid cylinder structure are assembled, see [link to patent]. Figure 1 The pull rod and piston use a special snap-fit ​​connection structure, which prevents the piston from being directly pulled out from the lower end of the pull rod. Forcing it out may cause plastic deformation of the locking part at the end of the pull rod. The deformed structure cannot effectively engage with the new piston inside the replaced cylinder, and the piston may easily dislodge under the force of the spring, affecting the continued use of the pump head. Therefore, with existing technology, when replacing a new specification cylinder and matching piston, all parts must be disassembled, replaced, and reassembled each time. The entire assembly process is complex, time-consuming, and costly. Utility Model Content

[0003] The purpose of this invention is to provide a foam pump and packaging bottle that facilitates the replacement of the liquid cylinder, thereby solving the technical problem that existing foam pumps require disassembly, replacement of parts, and reassembly when replacing the liquid cylinder with a new specification, which is complicated and time-consuming.

[0004] To achieve the above objectives, this utility model proposes a foam pump that facilitates the replacement of the liquid cylinder, including a pump head with a through discharge channel inside. An air cylinder unit is detachably connected to the bottom of the pump head, and the air cylinder unit has an air inlet chamber. A movable component is disposed within the air intake chamber, the movable component being used to connect or close the exhaust passage and the air intake chamber; the movable component includes a pull rod that moves up and down along the air intake chamber, the top end of a piston being detachably inserted into the bottom end of the pull rod; A liquid cylinder unit is detachably snapped onto the bottom of the air cylinder unit. The liquid cylinder unit has a liquid inlet chamber. The bottom end of the piston is movably inserted into the inner wall of the liquid cylinder unit. The movable component is also used to connect or close the discharge channel and the liquid inlet chamber.

[0005] Preferably, the piston has an upwardly extending extension at its top end, and the pull rod has a receiving cavity at its bottom end that matches the shape of the extension. The outer wall of the elongated part is provided with a plurality of protruding limiting rings, and the accommodating cavity is provided with a recessed limiting groove. The limiting rings can be detachably locked into the corresponding limiting grooves. The piston is also provided with several liquid inlet holes at its upper end, and the liquid inlet holes are located below the elongated part.

[0006] Preferably, the elongated portion is cylindrical; the outer wall of the elongated portion is provided with at least two limiting rings distributed at intervals along its height, the limiting rings being arc-shaped protrusions, and the accommodating cavity is provided with at least two corresponding limiting grooves.

[0007] Preferably, the air cylinder unit includes an outer cover and an air cylinder, the top end of the air cylinder is fitted inside the outer cover, and the bottom end of the outer cover is provided with a plug-in part, which is inserted into the air cylinder; The bottom end of the pump head is inserted into the top end of the outer cover, and there is a first air intake gap between the pump head and the outer cover; the pump head is also provided with a foaming net.

[0008] Preferably, the bottom end of the air cylinder is recessed upward to form an annular receiving groove, the top end of the receiving groove is provided with a locking position, and the top end of the liquid cylinder unit extends outward to form a limiting boss, which is detachably locked in the locking position.

[0009] Preferably, the movable component further includes a movable seat, a pull rod sleeve, a spring, and a spring seat. The top end of the movable seat is inserted into the pump head, and the connection between the movable seat and the pump head has a second air inlet gap. The bottom end of the foaming net is inserted into the movable seat. The top end of the pull rod sleeve is inserted into the movable seat, and the connection between the pull rod sleeve and the movable seat has an air passage. There is a liquid outlet channel between the pull rod and the pull rod sleeve, and the liquid outlet channel communicates with the liquid inlet. The pull rod is movably disposed within the pull rod sleeve to open or close the liquid outlet channel. The spring is sleeved on the outer wall of the lower end of the pull rod sleeve. The spring seat is disposed at the bottom end of the air cylinder, and the lower end of the spring abuts against the spring seat. An elastic valve plate is also provided between the movable seat and the pull rod sleeve. The elastic valve plate is used to control the gas in the air intake chamber to be discharged or drawn in through the ventilation gap.

[0010] Preferably, the liquid cylinder unit includes a head, a shoulder, and a tail arranged in sequence, wherein the diameter of the head is greater than the diameter of the shoulder, which is greater than the diameter of the tail; the head is inserted into the receiving groove, and the top of the head is provided with the limiting boss; the bottom end of the piston is movably inserted into the shoulder. A limiting cavity is provided at the connection between the shoulder and the tail, and a glass bead is provided in the limiting cavity for sealing or opening the limiting cavity; a straw is also inserted at the bottom of the tail.

[0011] Preferably, a sealing gasket is also provided below the top of the air cylinder.

[0012] Preferably, the outer wall of the pump head is provided with a movable clamp.

[0013] In addition, this utility model also proposes a packaging bottle, which is equipped with a foam pump as described above for easy replacement of the liquid cylinder.

[0014] The foam pump and packaging bottle disclosed in this utility model, which facilitates the replacement of the liquid cylinder, have the following beneficial effects: The air cylinder unit and liquid cylinder unit in this solution are separate structures, allowing users to replace the liquid cylinder unit with different specifications as needed. The piston is detachably inserted at the bottom of the pull rod; when replacing the liquid cylinder unit, the user can pull out the piston and replace it with a different piston compatible with the new liquid cylinder unit. This foam pump solution achieves different pumping volumes simply by replacing the piston and liquid cylinder unit from the bottom. The upper air cylinder unit and all moving components except the piston can be made into standardized modules, which can be stored during production and directly assembled with the lower piston and liquid cylinder unit when needed, simplifying assembly and shortening the production cycle. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the tie rod, piston, and air cylinder in a traditional foam pump. Figure 2 This is a schematic diagram of the structure of the foam pump of this utility model, which facilitates the replacement of the liquid cylinder; Figure 3 This is a cross-sectional structural diagram of the foam pump of this utility model that facilitates the replacement of the liquid cylinder. Figure 4 This is a cross-sectional structural diagram of the pump head, air cylinder unit, and moving components in the foam pump of this utility model that facilitates the replacement of the liquid cylinder. Figure 5 This is a cross-sectional structural diagram of the pull rod, piston, and liquid cylinder unit in the foam pump of this utility model, which facilitates the replacement of the liquid cylinder. Figure 6 This is a cross-sectional structural diagram of pistons and liquid cylinder units of different specifications in the foam pump of this utility model with easy liquid cylinder replacement. Figure 7This is a schematic diagram of the liquid cylinder unit in the foam pump of this utility model, which facilitates liquid cylinder replacement; Figure 8 This is a schematic diagram of the piston structure in the foam pump of this utility model, which facilitates the replacement of the liquid cylinder; Figure 9 This is a schematic diagram of the piston at another angle in the foam pump of the present invention, which facilitates the replacement of the liquid cylinder. Figure 10 This is a schematic diagram of the pull rod structure in the foam pump of this utility model, which facilitates the replacement of the liquid cylinder.

[0017] In the attached diagram: 1-Pump head, 11-Discharge channel, 12-First air inlet gap, 13-Aeration net, 14-Modible clamp, 2-Air cylinder unit, 21-Air inlet chamber, 22-Outer cover, 221-Plug-in part, 23-Air cylinder, 231-Receiving groove, 232-Clamping position, 233-Sealing gasket, 3-Modible component, 31-Pull rod, 311-Receiving cavity, 3111-Limiting groove, 32-Piston, 321-Extension part, 3211-Limiting ring, 322-Liquid inlet hole, 33-Modible seat, 34-Pull rod sleeve, 35-Spring, 36-Spring seat, 37-Liquid outlet channel, 38-Elastic valve plate, 4-Liquid cylinder unit, 41-Liquid inlet chamber, 42-Limiting boss, 43-Head, 44-Shoulder, 441-Limiting cavity, 45-Tail, 46-Glass bead, 47-Suction tube.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] like Figures 2 to 10 As shown, a foam pump with an easy-to-replace liquid cylinder includes a pump head 1, which has a through discharge channel 11 inside. Air cylinder unit 2, which is detachably connected to the bottom of the pump head 1, has an air inlet chamber 21 inside; The movable component 3 is disposed in the air intake chamber 21. The movable component 3 is used to connect or close the exhaust channel 11 and the air intake chamber 21. The movable component 3 includes a pull rod 31 that moves up and down along the air intake chamber 21. The top end of the piston 32 is detachably inserted into the bottom end of the pull rod 31. The liquid cylinder unit 4 is detachably snapped onto the bottom of the air cylinder unit 2. The liquid cylinder unit 4 has a liquid inlet chamber 41. The bottom end of the piston 32 is movably inserted into the inner wall of the liquid cylinder unit 4. The movable component 3 is also used to connect or close the discharge channel 11 and the liquid inlet chamber 41.

[0023] The foam pump with easily replaceable liquid cylinders in this design mainly consists of a pump head 1, an air cylinder unit 2, a movable component 3, and a liquid cylinder unit 4. Firstly, the air cylinder unit 2 and liquid cylinder unit 4 are separate structures, not the traditional integrated structure. Therefore, users can replace the liquid cylinder unit 4 with different specifications according to their needs. Secondly, through a special linkage structure between the pull rod 31 and the piston 32, the piston 32 can be detachably inserted into the bottom of the pull rod 31. When replacing the liquid cylinder unit 4, the user can pull out the piston 32 and replace it with another piston 32 compatible with the new liquid cylinder unit 4. Therefore, the foam pump with easily replaceable liquid cylinders in this design can achieve different pumping volume requirements simply by replacing the piston 32 and liquid cylinder unit 4 from the bottom. The upper part of the foam pump, the air cylinder unit 2, and the movable component 3 (excluding the piston 32), can all be made into standardized modules (i.e., the air cylinder unit 2 part can be universal). These can be stored during production, and when needed, the lower part, the piston 32 and liquid cylinder unit 4, can be directly assembled, simplifying assembly and shortening the production cycle.

[0024] Furthermore, the piston 32 has an upwardly extending extension 321 at its top end, and the pull rod 31 has a receiving cavity 311 at its bottom end that matches the shape of the extension 321. The outer wall of the elongated portion 321 is provided with a plurality of protruding limiting rings 3211, and the accommodating cavity 311 is provided with a recessed limiting groove 3111. The limiting rings 3211 are detachably locked in the corresponding limiting grooves 3111. The piston 32 is also provided with a plurality of liquid inlet holes 322 at its upper end, and the liquid inlet holes 322 are located below the elongated portion 321.

[0025] In this embodiment, as Figure 3 and Figure 8-10 As shown, the piston 32 is fixed by being inserted into the receiving cavity 311 through the extension part 321. To prevent the piston 32 from detaching from the lower end of the pull rod 31, a protruding limiting ring 3211 is provided on the extension part 321. The limiting ring 3211 can be stably engaged in the limiting groove 3111 in the receiving cavity 311, ensuring a stable connection between the pull rod 31 and the piston 32. In this design, the piston 32 has an upward-facing groove. The bottom end of the groove is provided with a conical connecting part. Two liquid inlet holes 322 are opened at the left and right ends of the connecting part, ensuring that the liquid in the liquid inlet cavity 41 can flow through the liquid inlet holes 322 to the upper part of the foam pump. The extension part 321 is located at the upper end of the connecting part and does not interfere with the liquid inlet holes 322. The extension part 321 is usually a long cylindrical shape with a conical top, which facilitates better insertion into the receiving cavity 311 at the bottom end of the pull rod 31.

[0026] Furthermore, the elongated portion 321 is cylindrical; the outer wall of the elongated portion 321 is provided with at least two limiting rings 3211 distributed at intervals along its height, the limiting rings 3211 are arc-shaped protrusions, and the accommodating cavity 311 is provided with at least two corresponding limiting grooves 3111.

[0027] In this embodiment, as Figure 8 As shown, the two limiting rings 3211 on the elongated part 321 provide a better fixing effect and prevent the piston 32 from coming off the lower end of the pull rod 31. In addition, the limiting rings 3211 are set as arc-shaped protrusions, which makes it easier for the user to pull out or insert the piston 32 from the lower end of the pull rod 31 when it is necessary to replace the liquid cylinder and the matching piston 32, and it is not easy to cause deformation of the two.

[0028] Furthermore, the air pump unit 2 includes an outer cover 22 and an air pump 23. The top end of the air pump 23 is fitted inside the outer cover 22, and the bottom end of the outer cover 22 is also provided with a plug-in part 221, which is inserted into the air pump 23. The bottom end of the pump head 1 is inserted into the top end of the outer cover 22, and there is a first air intake gap 12 between the pump head 1 and the outer cover 22; the pump head 1 is also provided with a foaming net 13.

[0029] In this embodiment, as Figures 3 to 4 As shown, the air pump unit 2 mainly consists of an outer cover 22 and an air pump 23. The outer cover 22 has a downward-facing opening, and the inner wall of the opening is provided with an internal thread that mates with the external thread of the packaging bottle. The top of the air pump 23 is inserted into the top of the inner part of the outer cover 22, and the outer cover 22 also has a ring of insertion part 221 inside, which is inserted into the air pump 23 to achieve a better sealing effect and ensure the air inlet chamber 21 is sealed when no external force is applied. The bottom end of the pump head 1 is inserted into the channel at the top of the outer cover 22, but not completely fitted, leaving a first air inlet gap 12. The bottom end of the pump head 1 is also stably connected to the outer cover 22 through the movable seat 33 and the air pump 23.

[0030] Furthermore, the bottom end of the air cylinder 23 is recessed upward to form an annular receiving groove 231, and the top end of the receiving groove 231 is provided with a locking position 232. The top end of the liquid cylinder unit 4 extends outward to form a limiting boss 42, and the limiting boss 42 is detachably locked in the locking position 232.

[0031] In this embodiment, to facilitate the insertion and removal of the liquid cylinder unit 4, a receiving groove 231 for accommodating the top of the liquid cylinder unit 4 is provided at the bottom of the air cylinder 23. A locking position 232 is provided in the receiving groove 231, and a limiting boss 42 is provided at the top of the liquid cylinder unit 4. When it is necessary to replace the liquid cylinder, first pull out the liquid cylinder unit 4 downwards, then pull out the piston 32 connected to the pull rod 31; then insert the piston 32 that is compatible with the new liquid cylinder unit 4, and finally insert the new specification liquid cylinder unit 4 to complete the replacement of different specification liquid cylinder units 4. The operation is convenient and it is not easy to damage the liquid cylinder unit 4, the liquid cylinder unit 4 and the moving component 3.

[0032] Furthermore, the movable component 3 also includes a movable seat 33, a pull rod sleeve 34, a spring 35, and a spring seat 36. The top end of the movable seat 33 is inserted into the pump head 1, and the connection between the movable seat 33 and the pump head 1 has a second air inlet gap. The bottom end of the foaming net 13 is inserted into the movable seat 33. The top end of the pull rod sleeve 34 is inserted into the movable seat 33, and the connection between the pull rod sleeve 34 and the movable seat 33 has an air passage gap. There is a liquid outlet channel 37 between the pull rod 31 and the pull rod sleeve 34. The liquid outlet channel 37 communicates with the liquid inlet hole 322. The pull rod 31 is movably disposed in the pull rod sleeve 34 to open or close the liquid outlet channel 37. The spring 35 is sleeved on the outer wall of the lower end of the pull rod sleeve 34. The spring seat 36 is disposed at the bottom end of the air cylinder 23, and the lower end of the spring 35 abuts against the spring seat 36. An elastic valve plate 38 is also provided between the movable seat 33 and the pull rod sleeve 34. The elastic valve plate 38 is used to control the gas in the air intake chamber 21 to be discharged or drawn in through the ventilation gap.

[0033] Specifically, such as Figures 3 to 4 As shown, the pump head 1 is connected to the movable seat 33 in the middle through a snap-fit ​​position to form a seal. The top end of the pull rod sleeve 34 is inserted into the movable seat 33 to form a connection. The elastic valve plate 38 is installed between the pull rod sleeve 34 and the movable seat 33 to control the discharge and intake of gas. The pull rod 31 is installed between the pull rod sleeve 34 and the piston 32 to control the sealing at the upper end. The spring 35 is installed between the pull rod sleeve 34 and the spring seat 36. The liquid cylinder unit 4 is snap-fitted to the air cylinder unit 2 to form a seal. The piston 32 slides and seals against the inner wall of the liquid cylinder unit 4.

[0034] Furthermore, the liquid cylinder unit 4 includes a head 43, a shoulder 44, and a tail 45 arranged in sequence. The diameter of the head 43 is greater than the diameter of the shoulder 44, which is greater than the diameter of the tail 45. The head 43 is inserted into the receiving groove 231, and the top of the head 43 is provided with the limiting boss 42. The bottom end of the piston 32 is movably inserted into the shoulder 44. A limiting cavity 441 is provided at the connection between the shoulder 44 and the tail 45. A glass bead 46 for sealing or opening the limiting cavity 441 is provided inside the limiting cavity 441. A straw 47 is also inserted into the bottom end of the tail 45.

[0035] In this embodiment, as Figures 5 to 7 As shown, the liquid cylinder unit 4 includes a three-section structure with gradually decreasing size, namely a head 43, a shoulder 44, and a tail 45. The top of the head 43 is provided with a limiting boss 42 to stably engage with the engagement position 232 of the receiving groove 231. A straw 47 is inserted into the tail 45. The straw 47 is inserted into the bottom of the liquid cylinder unit 4 and contacts the liquid in the packaging bottle. Under the action of air pressure, the liquid in the packaging bottle can be drawn into the liquid inlet chamber 41 of the shoulder 44. The bottom end of the piston 32 is also movably set in the liquid inlet chamber 41 of the shoulder 44. In order to better control whether the liquid enters the liquid inlet chamber 41, this solution provides a glass bead 46 in the limiting cavity 441 at the lower end of the liquid inlet chamber 41 to control the sealing of the space below connected to the straw 47, thereby realizing whether the liquid cylinder unit 4 is in contact with the liquid.

[0036] Furthermore, a sealing gasket 233 is provided below the top of the air cylinder 23. The sealing gasket 233 fits tightly with the air cylinder 23, so that after the foam pump, which facilitates the replacement of the liquid cylinder, is fixed to the packaging bottle, the internal gas is not easy to leak from the connection between the outer cap 22 and the air cylinder 23, ensuring the air inlet chamber 21 is sealed. Typically, the sealing gasket 233 is a rubber sealing ring.

[0037] Furthermore, the outer wall of the pump head 1 is provided with a movable clip 14. The movable clip 14 clamped on the pump head 1 can be removed during use. When clamped on the outer wall of the pump head 1, it avoids external force pressing on the pump head 1, forming a physical blockage and preventing liquid leakage. After removing the movable clip 14, the user can easily press the pump head 1 to squeeze out foam.

[0038] In particular, this utility model also proposes a packaging bottle equipped with the aforementioned foam pump with a replaceable liquid cylinder. The packaging bottle and the foam pump with a replaceable liquid cylinder are connected by an outer cap 22 threaded connection. Since the packaging bottle includes any of the aforementioned foam pumps with replaceable liquid cylinders, it has the same beneficial effects as the aforementioned foam pumps with replaceable liquid cylinders, which will not be described in detail here.

[0039] The foam pump operation process in this scheme, which facilitates cylinder replacement, is as follows: 1. When pressing for the first time, remove the movable clamp 14 and press the pump head 1 with external force. The specific component driving process is as follows: the pump head 1 drives the movable seat 33, the movable seat 33 drives the pull rod sleeve 34, and the pull rod sleeve 34 drives the pull rod 31 to move downward. During the above movement, the pull rod sleeve 34 will move a short distance first. At this time, due to the certain friction between the piston 32 and the liquid cylinder unit 4, the pull rod 31 connected to the piston 32 will first be fixed, so that the sealing and mating channel between the pull rod sleeve 34 and the pull rod 31 (the inclined surface at the top of the pull rod 31 and the pull rod sleeve 34) will open first. When the pump head 1 is pressed down, since the force is greater than the friction between the piston 32 and the liquid cylinder unit 4, the piston 32 will move downward together with the pull rod sleeve 34, the movable seat 33, etc.

[0040] 2. At the same time, the air in the intake chamber 21 will pass through the circumferential groove of the pull rod sleeve 34 to evenly and horizontally open the inner blade of the elastic valve plate 38, and the air will then be discharged into the external space through the ventilation gap between the movable seat 33 and the pull rod sleeve 34.

[0041] 3. When the hand is released, the external force on the pump head 1 disappears, and the pull rod 31 will first move to the sealing engagement channel with the pull rod sleeve 34 to complete the seal. Under the action of the spring 35, the pull rod 31, pull rod sleeve 34 and other components will continue to move upward. At this time, a vacuum environment will be formed in the lower space of the liquid cylinder unit 4. Since the pressure in the packaging bottle is greater than the pressure in the lower space of the liquid cylinder unit 4, the ball will move slightly upward and open the limiting cavity 441. The liquid in the packaging bottle enters the liquid inlet cavity 41 through the ball and is stored.

[0042] 4. When pressed again, the above action will be repeated. The difference is that this time the liquid will be discharged. After the liquid passes through the sealed connection channel between the top of the lever 31 and the lever sleeve 34, it will mix with the air discharged from the upper space of the air pump unit 2 through the inner leaf of the elastic valve plate 38. Then, they will pass through the foaming net 13 to form foam, and finally be discharged into the external space through the discharge channel 11 in the middle of the pump head 1.

[0043] 5. When the hand is released again, the external force is ineffective. Since the air in the upper space of the air pump unit 2 will also be discharged, the external pressure is greater than the air pressure in the upper space of the air pump unit 2 and the air pressure inside the packaging bottle. Therefore, during the rebound process, the outside air will pass through the gap between the pump head 1, the outer cover 22 and the movable seat 33 to cause the outer leaf of the elastic valve plate 38 to open and enter the upper space of the air pump unit 2 to maintain air pressure balance. Another part will enter the bottle through the small hole on the side of the air pump 23 to maintain the pressure in the bottle consistent with the outside.

[0044] 6. When pressed repeatedly, the above actions will be repeated continuously, and foamy liquid will flow out continuously until the liquid is consumed or the external force is removed.

[0045] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A foam pump with an easily replaceable liquid cylinder, characterized in that, include: Pump head (1), which has a through discharge channel (11) inside. An air cylinder unit (2) is detachably connected to the bottom of the pump head (1), and the air cylinder unit (2) has an air inlet chamber (21). An active component (3) is disposed within the air intake chamber (21). The active component (3) is used to connect or close the discharge channel (11) and the air intake chamber (21). The active component (3) includes a pull rod (31) that moves up and down along the air intake chamber (21). The top end of a piston (32) is detachably inserted into the bottom end of the pull rod (31). The liquid cylinder unit (4) is detachably snapped onto the bottom of the air cylinder unit (2). The liquid cylinder unit (4) has a liquid inlet chamber (41). The bottom end of the piston (32) is movably inserted into the inner wall of the liquid cylinder unit (4). The movable component (3) is also used to connect or close the discharge channel (11) and the liquid inlet chamber (41).

2. The foam pump with an easily replaceable liquid cylinder according to claim 1, characterized in that, The piston (32) has an upwardly extending extension (321) at its top end, and the pull rod (31) has a receiving cavity (311) at its bottom end that matches the shape of the extension (321). The outer wall of the elongated part (321) is provided with a plurality of protruding limiting rings (3211), and the accommodating cavity (311) is provided with a recessed limiting groove (3111). The limiting rings (3211) can be detachably locked in the corresponding limiting grooves (3111). The piston (32) is also provided with a number of liquid inlet holes (322) at its upper end, and the liquid inlet holes (322) are located below the elongated part (321).

3. A foam pump with an easily replaceable liquid cylinder according to claim 2, characterized in that, The elongated portion (321) is cylindrical; the outer wall of the elongated portion (321) is provided with at least two limiting rings (3211) distributed at intervals along its height, the limiting rings (3211) are arc-shaped protrusions, and the accommodating cavity (311) is provided with at least two corresponding limiting grooves (3111).

4. A foam pump with an easily replaceable liquid cylinder according to claim 2, characterized in that, The air cylinder unit (2) includes an outer cover (22) and an air cylinder (23). The top of the air cylinder (23) is fitted inside the outer cover (22), and the bottom of the outer cover (22) is also provided with a plug-in part (221), which is inserted into the air cylinder (23). The bottom end of the pump head (1) is inserted into the top end of the outer cover (22), and there is a first air intake gap (12) between the pump head (1) and the outer cover (22); a foaming net (13) is also provided inside the pump head (1).

5. A foam pump with an easily replaceable liquid cylinder according to claim 4, characterized in that, The bottom end of the air cylinder (23) is recessed upward to form an annular receiving groove (231). The top end of the receiving groove (231) is provided with a locking position (232). The top end of the liquid cylinder unit (4) extends outward to form a limiting boss (42). The limiting boss (42) is detachably locked in the locking position (232).

6. A foam pump with an easily replaceable liquid cylinder according to claim 4, characterized in that, The movable component (3) further includes a movable seat (33), a pull rod sleeve (34), a spring (35), and a spring seat (36). The top end of the movable seat (33) is inserted into the pump head (1), and the connection between the movable seat (33) and the pump head (1) has a second air intake gap. The bottom end of the foaming net (13) is inserted into the movable seat (33). The top end of the pull rod sleeve (34) is inserted into the movable seat (33), and the connection between the pull rod sleeve (34) and the movable seat (33) has a passage. The air gap has a liquid outlet channel (37) between the pull rod (31) and the pull rod sleeve (34), the liquid outlet channel (37) is connected to the liquid inlet (322), the pull rod (31) is movably disposed in the pull rod sleeve (34) to open or close the liquid outlet channel (37), the spring (35) is sleeved on the outer wall of the lower end of the pull rod sleeve (34), the spring seat (36) is disposed at the bottom end of the air cylinder (23), and the lower end of the spring (35) abuts against the spring seat (36); An elastic valve plate (38) is also provided between the movable seat (33) and the pull rod sleeve (34). The elastic valve plate (38) is used to control the gas in the air intake chamber (21) to be discharged or drawn in through the ventilation gap.

7. A foam pump with an easily replaceable liquid cylinder according to claim 5, characterized in that, The liquid cylinder unit (4) includes a head (43), a shoulder (44) and a tail (45) arranged in sequence. The diameter of the head (43) is greater than the diameter of the shoulder (44) and the diameter of the tail (45). The head (43) is inserted into the receiving groove (231), and the top of the head (43) is provided with the limiting boss (42). The bottom end of the piston (32) is movably inserted into the shoulder (44). A limiting cavity (441) is provided at the connection between the shoulder (44) and the tail (45), and a glass bead (46) for sealing or opening the limiting cavity (441) is provided in the limiting cavity (441); a straw (47) is also inserted at the bottom of the tail (45).

8. A foam pump with an easily replaceable liquid cylinder according to claim 4, characterized in that, A sealing gasket (233) is also provided below the top of the air cylinder (23).

9. A foam pump with an easily replaceable liquid cylinder according to claim 1, characterized in that, The outer wall of the pump head (1) is equipped with a movable clamp (14).

10. A packaging bottle, characterized in that, The packaging bottle is equipped with a foam pump as described in any one of claims 1-9, which facilitates the replacement of the liquid cylinder.

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