Springless all-plastic pressing type cream bottle

Abstract

The application relates to a spring-free full-plastic pressing type cream bottle, belonging to the technical field of cosmetic packaging, which comprises a bottle body, a pressing top cover and a pump body assembly. The bottle body comprises an outer shell and an inner shell slidably arranged in the outer shell. An installation cavity is arranged in the outer shell, and a containing cavity is arranged in the inner shell. The pressing top cover is arranged on the top of the inner shell. The pump body assembly comprises a piston, a soft pump arranged in the installation cavity and used for driving the piston to slide, a first one-way valve used for allowing external gas to flow into the soft pump, and a second one-way valve used for allowing gas in the soft pump to flow into the inner shell. A liquid outlet channel is arranged on the pressing top cover. A liquid outlet piston for opening and closing the liquid outlet channel is slidably arranged in the liquid outlet channel. The liquid outlet piston is connected with the piston through a connecting shaft. The application can reduce the solidification of liquid residues in the flow channel by driving the liquid outlet piston to slide and open and close the liquid outlet channel.

Description

Technical Field

[0001] This application relates to the technical field of cosmetic packaging, and in particular to a springless, all-plastic press-type cream bottle. Background Technology

[0002] Currently, in the cosmetics industry, containers with pump heads are generally used to hold lotions, serums, creams, etc., and the pump heads on these containers are generally designed to dispense liquid by pressing, allowing users to press the pump head to dispense the liquid from the container for use.

[0003] Pump-type containers for holding liquids such as lotions typically include a container body and an air pump assembly housed within the container body. The container body has a flow channel for liquid outflow. The air pump assembly includes a pump head, pump core, air pump spring, pump body, and air pump piston. When the user presses the pump head, the air pump piston slides downwards within the container body, compressing the air inside the container and pumping out the liquid through the flow channel. When the user releases the pump head, the air pump piston returns to its original position under the action of the air pump spring, stopping the pumping of liquid. During use, when the user releases the pump head, any unpumped liquid flows back into the container body. However, because lotions, serums, or creams are often viscous, this reflux can easily lead to contamination from contact with air, and the viscous liquid may also remain in the flow channel and solidify, affecting subsequent use. Summary of the Invention

[0004] In order to reduce the possibility of liquid residue remaining in the flow channel and solidification during use, this application provides a springless all-plastic press-type cream bottle.

[0005] This application provides a springless, all-plastic, press-type cream bottle, which adopts the following technical solution: The device includes a bottle body, a press-top cap disposed on top of the bottle body, and a pump assembly disposed within the bottle body. The bottle body includes an outer shell and an inner shell slidably mounted within the outer shell. The outer shell has a mounting chamber for sliding the inner shell, and the inner shell has a receiving chamber for holding liquid. The press-top cap is mounted on the top of the inner shell. The pump assembly includes a piston slidably disposed within the receiving chamber and a pump assembly disposed within the mounting chamber and abutting against the inner shell. The bottom side includes a soft pump for driving the piston to slide, a first one-way valve located on the bottom side of the soft pump for allowing external gas to flow into the soft pump, and a second one-way valve located on the bottom side of the inner housing for allowing gas from the soft pump to flow into the inner housing; the pressing top cover is provided with a liquid outlet channel for allowing liquid to flow out, and the pressing top cover is slidably disposed in the liquid outlet channel with a liquid outlet piston for opening and closing the liquid outlet channel, the liquid outlet piston being connected to the piston member through a connecting shaft, and the piston member driving the liquid outlet piston to slide.

[0006] By adopting the above technical solution, when using this springless all-plastic press-type cream bottle, lotions, creams, and other liquids are contained in the inner shell's accommodating chamber. The user presses the top cap to squeeze the inner shell downwards, causing the soft pump on the bottom side of the inner shell to be compressed. Air flowing into the soft pump through the first one-way valve flows into the inner shell through the second one-way valve, thus using air pressure to push the piston inside the inner shell upwards, causing the dispensing piston to slide upwards, thereby opening the dispensing channel. Simultaneously, the piston presses the liquid upwards, thus pumping the liquid out of the accommodating chamber. When using... When the top cover is released, the soft pump returns to its original shape, causing the piston to lose its gas pressure and slide downwards due to gravity. This causes the outlet piston to slide downwards, thus closing the outlet channel. The sliding of the outlet piston reduces the amount of viscous liquid remaining in the outlet channel. Furthermore, the closing of the outlet channel by the outlet piston effectively prevents external air and dust from entering the containment chamber. This reduces the possibility of liquid solidification due to residue in the outlet channel and also reduces the possibility of contamination or oxidation of the liquid in the containment chamber.

[0007] Optionally, the pressing top cover is provided with a guide ring on the side facing the piston, and the guide ring is provided with a through hole that passes through both ends of the guide ring. The through hole forms the liquid outlet channel, and the liquid outlet piston is provided with a limiting protrusion at the end facing the piston to slide and abut against the end of the guide ring.

[0008] By adopting the above technical solution, when the liquid outlet piston is driven to slide by the sliding of the piston component, when a large amount of liquid is used in the accommodating chamber, the piston component needs to slide upward a greater distance to pump out the liquid. During the upward sliding of the piston component, the limiting protrusion of the liquid outlet piston abuts against the end of the guide ring body, thereby limiting the sliding of the liquid outlet piston and reducing the occurrence of the liquid outlet piston sliding out of the guide hole under the drive of the piston component.

[0009] Optionally, the connecting shaft includes at least two rigid tubes and a flexible tube for connecting the two rigid tubes, wherein one rigid tube may be inserted into the other rigid tube.

[0010] By adopting the above technical solution, when the limiting protrusion of the liquid outlet piston abuts against the end of the conductive ring, since the piston and the liquid outlet piston are connected by a connecting shaft, when the liquid outlet piston stops sliding upward, it is easy to affect the upward sliding of the piston. Therefore, the connecting shaft is set as at least two rigid tubes and a flexible tube for connecting the two rigid tubes. When the liquid outlet piston stops sliding upward, one rigid tube slides upward and passes into the other rigid tube under the action of the flexible tube, thereby allowing the piston to continue sliding upward and reducing the occurrence of the liquid outlet piston affecting the sliding of the piston.

[0011] Optionally, the conductive ring body is provided with a liquid outlet guide portion at one end away from the piston member, and the liquid outlet piston is provided with a guide cone portion adapted to the liquid outlet guide portion at one end away from the piston member.

[0012] By adopting the above technical solution, when liquid flows out through the through hole, the liquid outlet guide at the end of the through ring can guide the liquid outflow, and the guide cone on the piston that matches the liquid outlet guide can also guide the liquid outflow at the same time. When the pumping of liquid stops, the guide cone that matches the liquid outlet guide can also seal the through hole, thereby improving the sealing performance of the liquid outlet piston.

[0013] Optionally, the springless all-plastic press-type cream bottle also includes a sealing cap that is detachably mounted on the top side of the inner housing and covers the upper side of the press-top cap.

[0014] By adopting the above technical solution, when storing liquids through a springless all-plastic press-type cream bottle, a sealing cap can be installed on the top side of the inner shell, thereby covering the top of the press-type cap. This allows the sealing cap to further seal the through hole, reducing the entry of external air or impurities into the accommodating chamber through the gap between the through hole wall and the liquid dispensing piston, thus further improving the sealing performance of the springless all-plastic press-type cream bottle.

[0015] Optionally, the liquid outlet piston is provided with a sealing ring at the end of the guide cone away from the piston member, which seals against the edge of the through hole.

[0016] By adopting the above technical solution, when the user releases the pressing top cover, the piston loses power and slides downward, causing the liquid outlet piston to slide downward as well. This allows the sealing ring at the end of the liquid outlet piston away from the piston to quickly seal the gap between the guide hole and the liquid outlet piston. This reduces the amount of liquid that comes into contact with the user after pressing the top cover and flows back into the receiving chamber through the guide hole. Consequently, it reduces the occurrence of liquid exposed to the outside flowing back into the receiving chamber and contaminating the lower layer of liquid, thereby improving the purity of the liquid in the receiving chamber.

[0017] Optionally, the pressing top cover is provided with a first guide surface for liquid outflow at the edge of the through hole on the side opposite to the piston.

[0018] By adopting the above technical solution, when the liquid is pushed out by the piston, the liquid flows out through the through hole. The flow of the liquid can be guided by pressing the first guide surface on the top cover surface. Thus, the setting of the first guide surface can further reduce the occurrence of liquid pumped out to the outside flowing back into the accommodating chamber.

[0019] Optionally, the liquid outlet piston is provided with a second guide surface on the end face opposite to the piston member for allowing liquid to flow out.

[0020] By adopting the above technical solution, when the liquid is pushed out by the piston, the liquid flows out through the through hole. The second guide surface on the end of the liquid outlet piston can guide the flow of the liquid, thereby further reducing the occurrence of liquid pumped out to the outside flowing back into the accommodating chamber.

[0021] Optionally, the sealing cap has a partition protrusion on the side facing the pressing top cover that abuts against the top side of the pressing top cover, and the pressing top cover has a snap-fit ​​ring groove around the through hole for the end of the partition protrusion to be snapped into.

[0022] By adopting the above technical solution, when the sealing cap is closed, the partition protrusion on the side of the sealing cap facing the pressing top cap is sealed and inserted into the snap ring groove on the pressing top cap. Thus, the through hole can be further sealed through the cooperation between the partition protrusion and the snap ring groove, thereby further improving the sealing performance of the springless all-plastic press-type cream bottle.

[0023] Optionally, the piston component has a hydraulic groove on the side facing the pressing top cover for the conductive ring body to be engaged.

[0024] By adopting the above technical solution, during use, when the liquid in the accommodating chamber gradually decreases, in the later stages of use, when the piston slides upward to the side close to the pressing top cover, the conducting ring can be engaged in the hydraulic groove of the piston, thereby reducing the gap between the piston and the pressing top cover, and pumping out the liquid in the accommodating chamber more completely, thus reducing the amount of liquid remaining in the accommodating chamber.

[0025] In summary, this application includes at least one of the following beneficial technical effects: This application includes a bottle body, a press-top cap, and a pump assembly. The pump assembly includes a piston, a soft pump, a first check valve, and a second check valve. The press-top cap has a dispensing piston in the dispensing channel. The dispensing piston is connected to the piston via a connecting shaft. Due to the sliding of the dispensing piston, the amount of liquid remaining in the dispensing channel due to its viscosity can be reduced. Furthermore, the dispensing piston can close the dispensing channel, effectively preventing external air and dust from entering the containing chamber through the dispensing channel.

[0026] The connecting shaft of this application includes at least two rigid tubes and a flexible tube for connecting the two rigid tubes. One rigid tube can be inserted into the other rigid tube. When the liquid outlet piston stops sliding upward, one rigid tube slides upward and is inserted into the other rigid tube under the action of the flexible tube, thereby allowing the piston to continue to slide upward. This application also includes a sealing cap that can be detachably installed on the top side of the inner housing and covers the upper side of the pressing top cover. The sealing cap can further seal the through hole, reducing the entry of outside air or impurities into the accommodating chamber through the gap between the through hole wall and the liquid outlet piston. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a springless, all-plastic press-type cream bottle according to an embodiment of this application.

[0028] Figure 2 This is a cross-sectional view of the overall structure of a springless, all-plastic press-type cream bottle according to an embodiment of this application.

[0029] Figure 3 yes Figure 2 Enlarged view at point A.

[0030] Figure 4 yes Figure 2 Enlarged view at point B.

[0031] Figure 5 yes Figure 2 Enlarged view at point C.

[0032] Figure 6 This is a cross-sectional schematic diagram of the piston of a springless, all-plastic press-type cream bottle according to an embodiment of this application, when it is pressed to its upper limit position.

[0033] Explanation of reference numerals in the attached drawings: 1. Bottle body; 11. Outer shell; 111. Mounting chamber; 12. Inner shell; 121. Receiving chamber; 122. Mounting protrusion; 123. Second limiting protrusion; 124. Second fixing protrusion; 13. Fixing ring; 131. First fixing protrusion; 2. Pressing top cap; 21. Mounting slot; 22. First limiting protrusion; 23. Discharge channel; 24. Conducting ring; 241. Conducting hole; 242. Discharge guide. 25. First guide surface; 26. Snap-fit ​​ring groove; 3. Sealing cap; 31. Partition protrusion; 4. Pump body assembly; 41. Piston component; 411. Liquid-pressing groove; 412. Mounting groove; 42. Flexible pump; 43. First check valve; 44. Second check valve; 5. Discharge piston; 51. Guide cone; 52. Second guide surface; 53. Sealing protrusion; 54. Limiting protrusion; 55. Receiving groove; 6. Connecting shaft; 61. Rigid tube body; 62. Flexible tube body. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0035] This application discloses a springless, all-plastic press-type cream bottle. See also... Figure 1 and Figure 2 The springless all-plastic press-type cream bottle includes a bottle body 1, a press-top cap 2 located on top of the bottle body 1, a sealing cap 3 detachably installed on the bottle body 1 and covering the outside of the press-top cap 2, and a pump assembly 4 located inside the bottle body 1 for pumping out liquid from the bottle body 1.

[0036] See Figure 2 The bottle body 1 includes an outer shell 11 and an inner shell 12 that slides vertically and horizontally within the outer shell 11. The outer shell 11 has a mounting chamber 111 for sliding the inner shell 12, and the pump assembly 4 is also mounted in the mounting chamber 111 and built into the bottom side of the inner shell 12. The inner shell 12 has a liquid-containing chamber 121, and a push-top cover 2 is mounted on the top of the inner shell 12. The push-top cover 2 and the inner shell 12 can be mounted in various ways; in this embodiment, the push-top cover 2 is detachably snapped onto the top of the inner shell 12. See [reference needed]. Figure 3The top cover 2 has an installation slot 21 on the side facing the inner housing 12. The top side of the inner housing 12 has an installation protrusion 122 that engages with the installation slot 21. The top cover 2 has a first limiting protrusion 22 on the groove wall of the installation slot 21. The inner housing 12 also has a second limiting protrusion 123 that engages with the first limiting protrusion 22 at the top of the installation protrusion 122. Thus, the fixed engagement of the first limiting protrusion 22 and the second limiting protrusion 123 can limit the installation of the top cover 2, improve the stability of the installation of the top cover 2, and the installation method is relatively convenient.

[0037] See Figure 2 The sealing cap 3 is detachably installed on the bottle body 1. In this embodiment, the sealing cap 3 is threaded onto the outer side of the top of the inner shell 12. At the same time, the sealing cap 3 can seal the press-top cap 2. Since the liquid in the inner shell 12 needs to be pumped out through the press-top cap 2 in this embodiment, the sealing cap 3 can seal its pump outlet to reduce the entry of outside air or impurities into the accommodating chamber 121 of the inner shell 12, thereby improving the sealing performance of the springless all-plastic press-type cream bottle.

[0038] See Figure 2 The pump assembly 4 includes a piston 41 that slides vertically within the accommodating chamber 121, a flexible pump 42 located in the mounting chamber 111 and abutting against the bottom side of the inner housing 12 for driving the piston 41 to slide, a first one-way valve 43 located on the bottom side of the flexible pump 42 for allowing external gas from the outer housing 11 to flow into the flexible pump 42, and a second one-way valve 44 located on the bottom side of the inner housing 12 for allowing gas from the flexible pump 42 to flow into the inner housing 12. The pressing top cover 2 is provided with a liquid outlet channel 23 for liquid outflow. In this embodiment, a guide ring 24 is provided on the side of the pressing top cover 2 facing the piston 41. The guide ring 24 has guide holes 241 extending through its upper and lower ends, forming the liquid outlet channel 23 for liquid outflow. In this embodiment, the pressing top cover 2 is made of elastic plastic material, and the guide ring 24 is integrally injection molded with the pressing top cover 2, giving the structure strong stability.

[0039] See Figure 2The piston 41 has a hydraulic groove 411 on the side facing the top cover 2 for the conduction ring 24 to engage. In this embodiment, the side of the piston 41 facing the top cover 2 is in contact with the bottom side of the top cover 2. When the piston 41 slides to the side close to the top cover 2, the conduction ring 24 can be engaged in the hydraulic groove 411 of the piston 41, thereby reducing the gap between the piston 41 and the top cover 2. As the liquid in the accommodating chamber 121 gradually decreases, the piston 41 and the top cover 2 are in contact, thereby pumping out the liquid in the accommodating chamber 121 more completely and reducing the amount of liquid remaining in the accommodating chamber 121.

[0040] See Figure 2 The springless, all-plastic press-type cream bottle also includes a dispensing piston 5 that slides up and down within the dispensing channel 23 and is used to open and close the dispensing channel 23. The dispensing piston 5 is connected to a piston member 41 located inside the inner housing 12 via a connecting shaft 6, and the piston member 41 drives the dispensing piston 5 to slide.

[0041] During use, the user presses the top cover 2 to squeeze the inner housing 12 downwards, causing the inner housing 12 to compress the soft pump 42 on its bottom side. Gas inside the soft pump 42 flows into the inner housing 12 through the second one-way valve 44, thereby using air pressure to squeeze the piston 41 inside the inner housing 12 upwards. Simultaneously, this causes the liquid outlet piston 5 to slide upwards, opening the liquid outlet channel 23. Liquid is then pumped out through the liquid outlet channel 23 as the piston 41 is compressed. When the user releases the top cover 2, the soft pump 42 draws in external air through the first one-way valve 43 to return to its original position. The inner housing 12 slides upwards, and the piston 41, losing power, slides downwards due to gravity, causing the liquid outlet piston 5 to slide downwards, closing the liquid outlet channel 23.

[0042] See Figure 4 A fixing ring 13 is mounted on the top side of the outer shell 11, and a first fixing protrusion 131 for abutting against the inner shell 12 is provided on the inner side of the fixing ring 13. A second fixing protrusion 124 is provided on the outer side of the inner shell 12 to slide and abut against the first fixing ring 13. In this embodiment, the fixing ring 13 is threaded onto the top side of the outer shell 11, and the outer shell 11 and the first fixing protrusion 131 are integrally injection molded. The second fixing protrusion 124 is integrally injection molded with the inner shell 12. When the soft pump 42 returns to its original state, the soft pump 42 drives the inner shell 12 to slide upward within the outer shell 11. After the inner shell 12 slides upward a certain distance, the first fixing ring 13 on the inner shell 12 abuts against the second fixing ring 13 on the fixing ring 13, thereby limiting the sliding of the inner shell 12 and reducing the occurrence of the inner shell 12 slipping out of the outer shell 11.

[0043] See Figure 5The conductive ring 24 has a liquid outlet guide portion 242 at one end opposite to the piston member 41. The liquid outlet piston 5 has a guide cone portion 51 adapted to the liquid outlet guide portion 242 at one end opposite to the piston member 41. In this embodiment, the liquid outlet guide portion 242 is configured with a guide slope, and this guide slope is configured to gradually diffuse away from the piston member 41. The guide cone portion 51 of the liquid outlet piston 5 has a cone surface that fits against the guide slope. When liquid flows out through the through hole 241, the liquid outlet guide portion 242 at the end of the conductive ring 24 can guide the liquid flow, and the guide cone portion 51 on the piston member 41 adapted to the liquid outlet guide portion 242 can also simultaneously guide the liquid flow. When pumping liquid stops, the guide cone portion 51 adapted to the liquid outlet guide portion 242 can also seal the through hole 241, thereby improving the sealing performance of the liquid outlet piston 5.

[0044] See Figure 5 The top cover 2 has a first guide surface 25 for liquid outflow on the edge of the through hole 241 away from the piston member 41. In this embodiment, the first guide surface 25 is configured to gradually descend in the direction away from the through hole 241. When liquid is pushed out by the piston member 41, the liquid flows out through the through hole 241. The first guide surface 25 on the surface of the top cover 2 can guide the flow of liquid, thereby further reducing the occurrence of liquid pumped out to the outside flowing back into the accommodating chamber 121.

[0045] See Figure 5 The liquid outlet piston 5 has a second guide surface 52 for supplying liquid outflow on its end face opposite to the piston member 41. In this embodiment, the second guide surface 52 is configured to gradually descend in the direction away from the through hole 241. When liquid is forced out by the piston member 41, the liquid flows out through the through hole 241. The second guide surface 52 on the end of the liquid outlet piston 5 guides the flow of liquid, thereby further reducing the occurrence of liquid pumped out to the outside flowing back into the accommodating chamber 121.

[0046] See Figure 5The dispensing piston 5 has a sealing ring 53 at the end of the guide cone 51 away from the piston member 41, which seals against the edge of the through hole 241. The sealing ring 53 and the dispensing piston 5 can be connected in various ways; in this embodiment, the sealing ring 53 and the dispensing piston 5 are integrally injection molded. When the user releases the top cover 2, the piston member 41 loses power and slides downwards, causing the dispensing piston 5 to slide downwards as well. This allows the sealing ring 53 at the end of the dispensing piston 5 away from the piston member 41 to quickly seal the gap between the through hole 241 and the dispensing piston 5. This reduces the amount of liquid that flows back into the accommodating chamber 121 after contact with the surface of the top cover 2, thereby reducing the possibility of liquid exposed to the outside flowing back into the accommodating chamber 121 and contaminating the lower layer of liquid, thus improving the purity of the liquid in the accommodating chamber 121.

[0047] See Figure 5 The sealing cap 3 has a partition protrusion 31 on the side facing the pressing top cap 2, which abuts against the top side of the pressing cap. The pressing top cap 2 has a snap-fit ​​ring groove 26 around the guide hole 241 for the end of the partition protrusion 31 to engage. In this embodiment, the partition protrusion 31 and the sealing cap 3 are integrally injection molded. When the sealing cap 3 is closed, the partition protrusion 31 on the side of the sealing cap 3 facing the pressing top cap 2 engages with the snap-fit ​​ring groove 26 on the pressing top cap 2, thereby further sealing the guide hole 241 through the cooperation of the partition protrusion 31 and the snap-fit ​​ring groove 26, thereby further improving the sealing performance of the springless all-plastic pressing cream bottle.

[0048] See Figure 2 The end of the liquid outlet piston 5 facing the piston member 41 is provided with a limiting protrusion 54 that slides and abuts against the end of the conducting ring body 24. In this embodiment, the limiting protrusion 54 is set as an annular plate and the annular plate is connected to the liquid outlet piston 5 through a connecting rod. A gap for liquid to flow through is opened on the annular plate, thereby reducing the interference of the limiting protrusion 54 on the flow of liquid. When the liquid outlet piston 5 is driven to slide by the sliding of the piston member 41, when a large amount of liquid is used in the accommodating chamber 121, the piston member 41 needs to slide upward a greater distance to pump out liquid. During the upward sliding process of the piston member 41, the limiting protrusion 54 of the liquid outlet piston 5 abuts against the end of the conducting ring body 24, thereby limiting the sliding of the liquid outlet piston 5 and reducing the occurrence of the liquid outlet piston 5 sliding out of the conducting hole 241 under the drive of the piston member 41. Furthermore, the outer diameter of the limiting protrusion 54 is set smaller than the outer diameter of the conducting ring 24. Thus, when the piston 41 slides upward to the upper limit position, the interference of the limiting protrusion 54 on the upward movement of the piston 41 is reduced, so that the piston 41 can pump out the liquid in the accommodating chamber 121 more completely.

[0049] See Figure 2The connecting shaft 6 includes at least two rigid tubes 61 and a flexible tube 62 for connecting the two rigid tubes 61. One rigid tube 61 can be inserted into another rigid tube 61. In this embodiment, the connecting shaft 6 includes three rigid tubes 61, and the three rigid tubes 61 are connected to each other by flexible tubes 62. The flexible tubes 62 are made of elastic materials such as rubber. As the piston 41 rises, the bottom rigid tube 61 is inserted into the middle rigid tube 61, and the middle rigid tube 61 is inserted into the upper rigid tube 61, thereby compressing them one by one. When the limiting protrusion 54 of the dispensing piston 5 abuts against the end of the conducting ring 24, since the piston 41 and the dispensing piston 5 are connected by a connecting shaft 6, when the dispensing piston 5 stops sliding upward, it is easy to affect the upward sliding of the piston 41. Therefore, the connecting shaft 6 is set as at least two rigid tubes 61 and a flexible tube 62 for connecting the two rigid tubes 61. When the dispensing piston 5 stops sliding upward, one rigid tube 61 slides upward and passes into the other rigid tube 61 under the action of the flexible tube 62. This allows the piston 41 to continue sliding upward, which can reduce the occurrence of the dispensing piston 5 affecting the sliding of the piston 41.

[0050] See Figure 6 The dispensing piston 5 has a receiving groove 55 on the side facing the piston member 41 for the connecting shaft 6 to be compressed and retracted into. The piston member 41 has a mounting groove 412 on the side facing the dispensing piston 5 for the end of the rigid tube 61 to be installed. When the piston member 41 slides upward to the upper limit position, the top side of the upper piston 41 abuts against the bottom side of the pressing top cover 2, so that the receiving groove 55 of the dispensing piston 5 and the mounting groove 412 of the piston member 41 are connected to form a space for the conductive ring 24, the limiting protrusion 54 and the retracted connecting shaft 6 to be inserted, thereby reducing the interference of the conductive ring 24, the limiting protrusion 54 and the connecting shaft 6 on the upward movement of the piston member 41.

[0051] See Figure 1 and Figure 2 In this embodiment, since the inner shell 12 is fitted inside the outer shell 11, and both the inner shell 12 and the outer shell 11 are cylindrical, the inner shell 12 can be rotatably disposed within the outer shell 11. A rotation locking member is provided between the inner shell 12 and the outer shell 11. When the inner shell 12 is rotated to the right, the inner shell 12 is in an unlocked state and can be pressed down; when the inner shell 12 is rotated to the left, the inner shell 12 is in a locked state. This improves the stability of the cream bottle in the unused state. Since this rotation locking member is not a key inventive point of this application, it will not be described in detail here.

[0052] The implementation principle of a springless, all-plastic press-type cream bottle in this application embodiment is as follows: When using this springless, all-plastic press-type cream bottle, lotions, creams, and other liquids are contained in the receiving chamber 121 of the inner shell 12. The user presses the top cover 2 to squeeze the inner shell 12 downwards, thereby squeezing the soft pump 42 on the bottom side of the inner shell 12. Air flowing into the soft pump 42 through the first one-way valve 43 flows into the inner shell 12 through the second one-way valve 44, thereby using air pressure to squeeze the piston 41 inside the inner shell 12 upwards, thus driving the dispensing piston 5 to... The piston slides upward, thereby opening the liquid outlet channel 23. At the same time, the piston 41 presses the liquid upward, thereby pumping out the liquid in the receiving chamber 121. When the user releases the top cover 2, the soft pump 42 returns to its original shape, causing the piston 41 to lose the gas pressure effect and slide downward due to gravity. This drives the liquid outlet piston 5 to slide downward, thereby closing the liquid outlet channel 23. Due to the sliding of the liquid outlet piston 5, the liquid that is relatively viscous can be reduced from remaining in the liquid outlet channel 23.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A springless, all-plastic press-type cream bottle, characterized in that, The device includes a bottle body (1), a press-top cap (2) disposed above the bottle body (1), and a pump assembly (4) disposed within the bottle body (1). The bottle body (1) includes an outer shell (11) and an inner shell (12) slidably mounted inside the outer shell (11). The outer shell (11) has an installation chamber (111) for sliding installation of the inner shell (12). The inner shell (12) has a accommodating chamber (121) for holding liquid. The press-top cap (2) is mounted on the top of the inner shell (12). The pump assembly (4) includes a piston (41) slidably disposed within the accommodating chamber (121), and a pump assembly (4) disposed in the installation chamber (111) and abutting against the inner shell (121). 12) A soft pump (42) on the bottom side for driving the piston (41) to slide, a first one-way valve (43) on the bottom side of the soft pump (42) for allowing external gas to flow into the soft pump (42), and a second one-way valve (44) on the bottom side of the inner shell (12) for allowing gas in the soft pump (42) to flow into the inner shell (12); the pressing top cover (2) is provided with a liquid outlet channel (23) for allowing liquid to flow out, and the pressing top cover (2) is slidably provided with a liquid outlet piston (5) in the liquid outlet channel (23) for opening and closing the liquid outlet channel (23), and the liquid outlet piston (5) is connected to the piston (41) through a connecting shaft (6), and the piston (41) drives the liquid outlet piston (5) to slide.

2. The springless, all-plastic press-type cream bottle according to claim 1, characterized in that, The pressing top cover (2) is provided with a guide ring (24) on the side facing the piston (41). The guide ring (24) is provided with a guide hole (241) that passes through both ends of the guide ring (241), and the guide hole (241) forms the liquid outlet channel (23). The liquid outlet piston (5) is provided with a limiting protrusion (54) that slides and abuts against the end of the guide ring (24) at one end facing the piston (41).

3. A springless, all-plastic press-type cream bottle according to claim 1, characterized in that, The connecting shaft (6) includes at least two rigid tubes (61) and a flexible tube (62) for connecting the two rigid tubes (61), wherein one rigid tube (61) can be inserted into the other rigid tube (61).

4. A springless, all-plastic press-type cream bottle according to claim 2, characterized in that, The conductive ring (24) has a liquid outlet guide (242) at one end away from the piston (41), and the liquid outlet piston (5) has a guide cone (51) adapted to the liquid outlet guide (242) at one end away from the piston (41).

5. A springless, all-plastic press-type cream bottle according to claim 2, characterized in that, It also includes a sealing cap (3) that is detachably installed on the top side of the inner housing (12) and covers the upper side of the pressing top cover (2).

6. A springless, all-plastic press-type cream bottle according to claim 4, characterized in that, The liquid outlet piston (5) has a sealing ring (53) at the end of the guide cone (51) away from the piston (41) that seals against the edge of the through hole (241).

7. A springless, all-plastic press-type cream bottle according to claim 2, characterized in that, The pressing top cover (2) is provided with a first guide surface (25) for liquid outflow at the edge of the through hole (241) on the side opposite to the piston (41).

8. A springless, all-plastic press-type cream bottle according to claim 1, characterized in that, The liquid outlet piston (5) has a second guide surface (52) for supplying liquid outflow on the end face of the side opposite to the piston member (41).

9. A springless, all-plastic press-type cream bottle according to claim 5, characterized in that, The sealing cap (3) is provided with a partition protrusion (31) that abuts against the top side of the pressing top cap (2) on the side facing the pressing top cap (2). The pressing top cap (2) has a snap-fit ​​ring groove (26) for the end of the partition protrusion (31) to be snapped into the periphery of the through hole (241).

10. A springless, all-plastic press-type cream bottle according to claim 2, characterized in that, The piston (41) has a hydraulic groove (411) on the side facing the pressing top cover (2) for the conductive ring (24) to be inserted.

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