Pump assembly and container with content discharge function

Abstract

A pump assembly is provided, including a pump body, a pressure rod, and a cap. A fixed portion of the outer ring body is used to connect to a bottle neck, and a receiving cavity is located outside the bottle neck. The main pump body includes a first housing and a content cavity enclosed by the first housing. At least a portion of the first housing and a second wall define an annular chamber for receiving the bottle neck. The upper pump body includes an outer shell, an inner shell, an annular cavity, and an inner shell channel. The piston rod of the upper piston is configured to move with the pressure rod. The sidewall of the piston portion seals and slidably engages with the outer shell and inner shell, dividing the annular cavity into a first air chamber and a second air chamber by its own movement. The lower piston is slidably sleeved on the outer periphery of the pressure rod, dividing the content cavity into a third air chamber and a fourth air chamber by its own movement. The third and second air chambers are connected. The pressure rod passes through the outer ring body, the inner shell channel, the main pump body, the upper piston, and the lower piston, with its lower end extending into the content cavity. The above pump assembly is suitable for small-diameter bottles. A container with a content discharge function is also provided.

Description

Technical Field

[0001] The utility model relates to a pump component and a container with the function of discharging contents. Background Art

[0002] The container with the function of discharging contents has a bottle mouth, which serves as a liquid filling port, and a pump assembly is arranged in the liquid filling port to pump the contents. Chinese patent CN110155489A discloses a pump assembly and a container with the function of discharging contents, but the inventor found that when the inner diameter of the liquid filling port is small, the pump assembly needs to be reduced in size as a whole, which makes it difficult to prepare industrially and the yield is not high; and the reduced size makes it impossible for the chamber to form sufficient negative pressure, affecting the pumping performance. Utility Model Content

[0003] One object of the utility model is to provide a pump assembly suitable for a bottle mouth with a small diameter.

[0004] To achieve the above-mentioned purpose, the pump assembly is used to be assembled on a bottle body containing contents, the bottle body includes a bottle mouth, the pump assembly includes a pump body, a pressure rod, and a head cap, the pressure rod includes a hollow cavity, and the pump body includes: an outer ring body, including a first wall body and a second wall body, the first wall body surrounds a accommodating cavity, the second wall body includes a fixing portion, the fixing portion is used to connect with the bottle mouth, and the accommodating cavity is located outside the bottle mouth; a main pump body, at least partially located in the outer ring body, including a first shell and a content cavity surrounded by the first shell, at least part of the first shell and the second wall body define an annular chamber, and the annular chamber is used to accommodate the bottle mouth; an upper pump body, located in the accommodating cavity, including an outer shell, an inner shell, and a cap formed by the outer shell and the second wall body. The annular cavity defined by the inner shell and the inner shell channel surrounded by the inner shell; the upper piston is located in the content cavity and the annular cavity, comprising a piston part and a piston rod, the piston rod is configured to move with the pressure rod, the side wall of the piston part is sealed and slidably matched with the outer shell and the inner shell, and the annular cavity is divided into a first air chamber and a second air chamber by its own moving position; the lower piston is slidably mounted on the outer circumference of the pressure rod, and the lower piston divides the content cavity into a third air chamber and a fourth air chamber by its own movement, and the third air chamber is connected to the second air chamber; wherein, the pressure rod passes through the outer ring body, the inner shell channel, the main pump body, the upper piston and the lower piston, and the lower end extends into the content cavity.

[0005] In one or more embodiments, the pressure rod also includes a bottom end cap and a connecting hole, and the connecting hole is connected to the hollow cavity; wherein the friction force between the lower piston and the first shell is set to be greater than the friction force between the lower piston and the pressure rod, and the connecting hole is closed or opened by means of the relative position of the lower piston and the pressure rod.

[0006] In one or more embodiments, the pressure rod includes a first limiting rib, and the first limiting rib and the bottom end sealing cap are respectively used to limit the lower piston in the upper and lower directions.

[0007] In one or more embodiments, the pump assembly also includes a kit sleeved on the outside of the pressure rod, the kit including a sleeve and a flange located at the bottom of the sleeve, the piston rod including a piston channel, a limiting portion arranged at the bottom of the piston channel, and an orifice arranged on the limiting portion, the pressure rod passes through the piston channel and the orifice, the kit is located in the piston channel, and the flange is used to resist the limiting portion.

[0008] In one or more embodiments, the compression rod further includes a second limiting rib, and the second limiting rib is used to abut against the top of the sleeve.

[0009] In one or more embodiments, the main pump body further includes an extension portion located at the top end of the first shell body, an annular groove is provided at the connection between the first wall body and the second wall body, and the extension portion is embedded in the annular groove.

[0010] In one or more embodiments, the piston portion includes a butterfly-shaped side wall and a top recessed area, the butterfly-shaped side wall is sealed and slidably matched with the inner wall of the shell, and the upper pump body includes a downwardly extending protrusion matched with the top recessed area.

[0011] In one or more embodiments, the piston portion further includes a column, which extends along the axial direction of the pressure rod, and the lower edge of the column is longer than the lower edge of the butterfly-shaped side wall, and is used to abut against the extension portion.

[0012] In one or more embodiments, the pump assembly further includes an extension tube, and the main pump body further includes a second shell located below the first shell, and the second shell encloses a docking cavity for connection with the extension tube.

[0013] In one or more embodiments, the pump assembly further comprises a one-way valve disposed within the docking cavity.

[0014] In one or more embodiments, the upper side of the one-way valve includes a receiving hole, and the pressure rod includes a bottom sealing cap, which is configured to fit the shape of the receiving hole when the pressure rod moves down to the extreme position to press down the one-way valve.

[0015] In one or more embodiments, the upper side of the one-way valve includes a accommodating hole, and the pressure rod includes a bottom sealing cap, the width of the bottom sealing cap is greater than or equal to the minimum inner diameter of the accommodating hole, and is configured to block the accommodating hole when the pressure rod moves down to the extreme position.

[0016] In one or more embodiments, the first wall includes an opening at the top and an annular groove in the opening, and the pressure rod includes a convex ring that cooperates with the annular groove.

[0017] In one or more embodiments, the head cap includes a delivery channel and a protrusion located in the delivery channel, the delivery channel is connected to the hollow cavity, and the pressure rod includes a groove that engages with the protrusion.

[0018] In one or more embodiments, the head cap comprises a nozzle.

[0019] Another object of the utility model is to provide a container with a content discharge function, comprising a bottle body and the above-mentioned pump assembly, wherein the bottle body comprises a bottle body and a bottle mouth, and the bottle mouth is connected to the outer ring body of the pump assembly.

[0020] The above-mentioned pump assembly is provided with a accommodating cavity located outside the bottle mouth on the outer ring body, and multiple structures such as the piston part of the pump body are transferred to the outside of the bottle mouth, thereby simplifying the number and structure of components extending into the bottle mouth, so that the pump assembly can provide sufficient pressure required to pump liquid, and also significantly reduces the difficulty of preparing the pump assembly, effectively improving the preparation yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0022] Figure 1 It is a schematic diagram of the cooperation between the pump assembly and the container;

[0023] Figure 2 is a schematic diagram of the container;

[0024] Figure 3A It is a component exploded view of the pump assembly;

[0025] Figure 3B is a cross-sectional view of the components of the pump assembly;

[0026] Figures 4A-4D is a cross-sectional view of the pump assembly with the plunger in different positions;

[0027] Figure 5A-5B It is a schematic diagram of the structure of the outer ring;

[0028] Figure 6A-6B It is a structural schematic diagram of the upper pump body;

[0029] Figure 7A-7B It is a structural diagram of the main pump body;

[0030] Figures 8A-8B is a schematic diagram of the upper piston;

[0031] Fig. 9 is a schematic diagram of the pressure rod;

[0032] Figures 10A-10B is a schematic diagram of the lower piston;

[0033] Fig.11 Here is a schematic diagram of the kit;

[0034] Fig.12 is a schematic diagram of a one-way valve.

[0035] Fig.13 It is a schematic diagram of a head cap;

[0036] Figures 14A-14B It is a schematic diagram of the sealing cap at the bottom end of the pressure rod blocking the one-way valve. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0038] It should be noted that these and other subsequent drawings are only examples and are not drawn in proportion, and should not be used as a limitation on the actual scope of protection required by the present utility model.

[0039] The pump assembly disclosed in Chinese patent CN110155489 includes a pump body, a pressure rod and a head cap, and the pump body is detachably inserted into the liquid filling port. The head cap is used to be pressed by the user to drive the pressure rod to press down relative to the pump body, so that the contents retained in the pump body can be discharged from the pump body through the channel inside the pressure rod and the head cap. The pump body includes multiple components such as an outer shell and an inner shell, and the pressure rod body is located in the give way channel of the inner shell. The outer shell, the first inner shell side wall, and the second inner shell side wall form a multi-layer annular cavity and channel structure, and the rod body also needs to form an internal discharge channel, making the structure extending into the liquid filling port more complicated. For example, for a bottle mouth with a smaller inner diameter of 33mm, 28mm or less than 20mm, the pump assembly needs to be reduced in size as a whole to adapt to the inner diameter. Since the pump assembly is generally made of plastic, the yield rate of processing smaller-sized injection molded parts is low and it is not easy to prepare. In addition, the reduced size reduces the air cavity, and the air pressure required for pumping cannot be formed, affecting the pumping performance.

[0040] In addition, existing pump assemblies generally use a one-way valve body to control the one-way flow of liquid. In Chinese patent CN110155489, a second one-way valve body and a first one-way valve body are used to control the one-way flow between the discharge channel of the rod body and the head cap and the one-way flow between the content cavity of the outer shell and the container body, respectively. However, for contents with higher density or higher viscosity, the second one-way valve body located on the upper side is easily lifted by the contents, thereby affecting its one-way control effect.

[0041] In order to solve the above problems, the pump assembly provided by the utility model refers to Figures 1 to 3B The pump assembly is assembled on the bottle body 90 containing the contents, the bottle body 90 comprises a bottle mouth 902 and a bottle body 901, the bottle body 901 stores the contents, and the bottle mouth 902 serves as a liquid filling port and is connected to the pump assembly.

[0042] The pump assembly includes a pump body 1, a pressure rod 2, a head cap 3 and an extension tube 4. The extension tube 4 extends into the bottle body 901 to transfer the contents in the bottle body 901 to the pump body 1 for temporary storage. One end of the pressure rod 2 is connected to the head cap 3, and the other end is located in the pump body 1. As the head cap 3 is pressed, the contents temporarily stored in the pump body 1 are pumped to the head cap 3 and discharged.

[0043] Head cap 3 reference Fig.13 It is understood that as a pumping body located outside the bottle body, it also serves as a force-applying component. The head cap 3 includes a pressing portion 31, a connecting portion 32 and a delivery channel 33. The connecting portion 32 is connected to the pressure rod 2, and the delivery channel 33 is connected to the hollow cavity 21 of the pressure rod 2 to deliver the contents out of the container.

[0044] In some embodiments, the head cap 3 includes a nozzle, and the effect of spraying mist or mass contents is achieved by designing the nozzle to have a specific channel and structure.

[0045] A protrusion 34 is also provided in the delivery channel 33, and the pressure rod 2 includes a groove 27 that engages with the protrusion 34. Figures 4A-4D and Fig. 9 As shown, the protrusion 34 is buckled with the groove 27. The pressure rod 2 also includes a hollow cavity 21 and a bottom end cap 22. The hollow cavity 21 is connected to the conveying channel 33 for pumping the contents. The hollow cavity 21 is provided with a connecting hole 23 on one side close to the bottom end cap 22. After the groove 27 is buckled with the protrusion 34, the bottom of the head cap connecting part 32 contacts the top surface of the outer ring body 1. In addition to the groove 27, the pressure rod 2 is also provided with a convex ring 26, a second limiting rib 25, and a first limiting rib 24 from top to bottom. For details, please refer to the description of the subsequent embodiments.

[0046] Pump body 1 reference Figures 3A-4D As shown, it includes an outer ring body 11, a main pump body 13, an upper piston 14 and a lower piston 15.

[0047] The outer ring 11 is the outermost structure of the pump body 1. Figure 5A-5B It is understood that the pump assembly includes a first wall 119, a second wall 118 and an opening 117 at the top of the first wall 119, and the opening 117 is for the pressure rod 2 to pass through. An annular groove 116 is provided in the opening 117. When the pump assembly is in an unactivated state, the convex ring 26 of the pressure rod 2 is engaged with the annular groove 116, so that the pressure rod 2 cannot move. At this time, the bottom of the head cap 3 abuts against the top of the outer ring body 11, as shown in FIG. Figure 4A shown.

[0048] The first wall 119 is provided with a receiving cavity 111, and the second wall 118 is located at the lower side of the first wall 119, and is provided with a fixing cavity 112. The inner wall of the second wall 118 is also provided with a fixing portion 114, which is used to fix with the bottle mouth 902 of the container 90. For example, the fixing portion 114 is an inner circle thread provided on the inner wall of the second wall 118, and the bottle mouth 902 includes an outer circle thread, and the pump assembly with the outer ring body 11 is fixed to the container as a whole through the thread structure. It can be understood that after being fixed with the bottle mouth, the receiving cavity 111 of the outer ring body 11 is located as a whole outside the container 90, especially outside the bottle mouth 902, which can simplify the structure of the pump assembly extending into the bottle mouth and the bottle body.

[0049] In order to improve the sealing performance, an upper pump body 12 is provided in the accommodating chamber 111. Figure 4D as well as Figure 6A-6B As shown, the upper pump body 12 includes an outer shell 121 , an inner shell 122 , an annular cavity 123 defined by the outer shell 121 and the inner shell 122 , and an inner shell channel 124 surrounded by the inner shell 122 . The pressure rod 2 passes through the inner shell channel 124 .

[0050] Main pump body 13 reference Figures 4A-4D as well as Figure 7A-7B It is understood that one part is located in the second wall 118 of the outer ring body 11, and the other part is located at the lower side of the outer ring body 11. The main pump body 13 includes a first shell 139 and a second shell 138. The first shell 139 surrounds a content chamber 131, which is used to temporarily store the content; the second shell 138 surrounds a docking chamber 132, which cooperates with the extension tube 4. Figure 4A As shown, the upper portion of the first shell 139 is located in the second wall 118 , and the lower portion is located in the bottle mouth 902 . An annular chamber is defined between the upper portion of the first shell 139 and the second wall 118 of the outer ring body 11 to accommodate the bottle mouth 902 .

[0051] In some embodiments, the outer diameter of the first wall 119 of the outer ring body 11 is smaller than that of the second wall 118, and a ring groove 115 is provided at the connection between the first wall 119 and the second wall 118. A ring extension portion 137 is provided on the upper side of the first shell 139 of the main pump body 13, and the extension portion 137 is embedded in the ring groove 115 to fix the main pump body 13 on the outer ring body 11.

[0052] Upper piston 14 reference Figures 4A-4D as well as Figures 8A-8B It is understood that it includes a piston rod 141 and a piston portion 142. The piston rod 141 includes a piston channel 143 for the pressure rod 2 to pass through, and the bottom of the piston rod 141 is provided with a limit portion 144 and an orifice 145 located on the limit portion 144 for communicating with the piston channel 143, and the pressure rod 2 passes through the orifice 145.

[0053] The piston rod 141 is configured to move with the pressure rod 2, and then drive the piston portion 142 to move up and down in the annular cavity 123. In some embodiments, the pressure rod 2 pushes the piston rod 141 to move through the sleeve 20. The sleeve 20 is as shown in FIG. Figures 4A-4D as well as Fig.11 As shown, it includes a sleeve 201 and a flange 202 at the bottom. The sleeve 201 is sleeved on the outside of the pressure rod 2 and is installed in the inner shell channel 124 of the upper pump body 12 and the main pump body 13 together with the pressure rod 2. The flange 202 abuts against the upper piston limiter 144. When the pressure rod 2 moves downward, the second limit rib 25 of the pressure rod 2 presses against the top of the sleeve 201. Figure 4B Or as shown in FIG4D , the pressing rod 2 is pushed downward to press the limiting portion 144 , so that the upper piston 14 moves downward.

[0054] The piston part 142 is located in the annular cavity 123 as a whole. The inner shell 122 of the upper pump body 12 isolates the piston part 142 from the pressure rod 2. The inner and outer wall surfaces of the piston part 142 are respectively sealed and slidably matched with the inner wall of the outer shell 121 of the upper pump body 12 and the outer wall of the inner shell 122. The piston part 142 moves up and down in the annular cavity 123, thereby dividing the annular cavity 123 into a first air chamber A and a second air chamber B. By providing the upper pump body 12, the piston part 142 is limited to move in the annular cavity 123, further improving the air tightness of the air chamber, avoiding the air leakage caused by the up and down movement of the pressure rod, and ensuring that the first air chamber A provides sufficient air pressure to reset the pressure rod.

[0055] The bottom of the housing 121 of the upper pump body 12 abuts against the extension 137 of the main pump body 13. At the same time, the extension 137 also serves as a stop end of the piston portion 142 to prevent the piston portion 142 from moving further downward.

[0056] Reference Figures 4B-4D , Figures 8A-8BAs shown, in a preferred embodiment, the piston portion 142 includes a butterfly-shaped side wall 1421 and a top recessed area 1423, and the butterfly-shaped side wall 1421 includes two side wings. The two side wings form a crossed half X structure, and the two side wings are sealed and slidably interfered with the inner wall of the outer shell 121 of the upper pump body 12 to further improve the airtight effect. The piston portion 142 also includes an inner sealing surface 1425, which is an inclined surface to form the minimum inner diameter of the piston portion 142. The inner sealing surface 1425 contacts the wall surface of the inner shell 122 of the upper pump body, as shown in FIG. Figure 4D As shown, the butterfly-shaped side wall 1421 cooperates with each other to seal both the inside and the outside, ensuring that there is no leakage inside or outside.

[0057] Back to Figure 8B The butterfly-shaped side wall 1421 forms a top recessed area 1423 on the upper side of the piston portion 142. Correspondingly, the upper pump body 12 includes a downwardly extending protrusion 125 that cooperates with the top recessed area 1423. Figure 6B and Figure 4C Through the above design, when the piston portion 142 abuts against the upper portion of the annular cavity, the downwardly extending protrusion 125 cooperates with the top recessed area 1423 to squeeze out the air in the top recessed area 1423 .

[0058] The butterfly-shaped side wall 1421 is closely fitted to the inner wall of the housing 121 to ensure the airtightness of the air chamber. Figures 8A-8B In the illustrated embodiment, the piston portion 142 further includes a column 1422, which extends along the axial direction of the pressure rod, and the lower edge of the column 1422 is longer than the lower edge of the butterfly-shaped side wall 1421. Figure 4D As shown, it replaces the butterfly-shaped side wall 1421 and is used to abut the extension portion 137 of the main pump body 13 to avoid damage to the butterfly-shaped side wall 1421, so that the piston portion maintains better airtight performance for a long time.

[0059] The pump assembly also includes a lower piston 15. Figures 4A-4D as well as Figures 10A-10B As shown, the lower piston 15 includes a piston hole 150 for the pressure rod 2 to pass through, a circumferential outer wall 151, an upper end surface 152 and a lower end surface 153. The circumferential outer wall 151 is sealed with the inner wall of the first housing 139 of the main pump body 13. The lower piston 15 moves up and down with the pressure rod 2, dividing the content chamber 131 into a third chamber B' and a fourth chamber C. The third chamber B' is connected to the second chamber B, as shown in FIG. Figure 4A As shown, the second chamber B is referred to hereinafter.

[0060] The pressure rod 2 passes through the outer ring body 11, the upper pump body 12, the sleeve 20, the upper piston 14 and the lower piston 15 in sequence, and the lower end extends into the content chamber 131. The friction between the lower piston 15 and the first housing 139 of the main pump body 13 is set to be greater than the friction between the lower piston 14 and the pressure rod 2, so that when the pressure rod 2 moves up and down, the lower piston 15 produces a hysteresis movement, and the communication hole 23 on the pressure rod 2 is closed or opened by the relative position of the lower piston 14 and the rod body 2.

[0061] For example, when the lower end surface 153 of the lower piston 15 abuts against the bottom end cap 22, the lower piston 15 blocks the communication hole 23, isolating the content chamber 131 from the hollow chamber 21. When the lower piston 15 gradually moves upward along the pressure rod 2, the communication hole 23 gradually becomes exposed and communicates with the content chamber 131 until the upper end surface 152 of the lower piston 15 contacts the first limiting rib 24 of the pressure rod 2 and stops moving. Through the cooperation of the lower piston 15 and the communication hole 23, the communication and isolation between the content and the hollow chamber 21 of the pressure rod are effectively controlled, replacing the upper one-way valve structure in the traditional structure, and realizing the on-off function of the delivery.

[0062] The pump assembly also includes a one-way valve 16, such as Figure 4B as well as Fig.12 As shown, the one-way valve 16 is arranged in the docking chamber 132 below the main pump body 13. The one-way valve 16 includes a conical valve body 161 and a barb 162, and the docking chamber 132 provides an inclined surface 133 that matches the conical surface of the conical valve body 161. The conical valve body 161 fits the inclined surface 133 of the docking chamber 132, so that the entrance of the content chamber 131 is in a closed state. When the fourth chamber C is in a negative pressure state, the one-way valve 16 is sucked up by the negative pressure as a whole and the entrance of the content chamber 131 is opened, and the content 800 enters the content chamber 131 through the extension tube 4, and at the same time, the barb 162 limits the rising position of the one-way valve 16.

[0063] In some embodiments, the upper side of the one-way valve 16 includes a receiving hole 165, and the bottom end sealing cap 22 of the pressure rod 2 is configured to fit the shape of the receiving hole 165 when the pressure rod 2 moves downward to the limit position, such as Fig.14A As shown. When the head cap of the pump assembly is against the upper side of the outer ring body, the pressure rod 2 is at the extreme downward position. At this time, by making the bottom sealing cap 22 cooperate with the accommodating hole 165, the contact between the bottom sealing cap 22 and the top surface of the one-way valve 16 can press down the one-way valve 16, so that it completely seals the outlet slope 133 of the lower pump body 13, thereby improving the sealing effect of the one-way valve 16 and avoiding the excessive pressure in the container bottle 901 that pushes the one-way valve 16 upward, thereby causing accidental leakage of the pump assembly. In other embodiments, the width of the bottom sealing cap 22 along the left and right directions of the paper can also be set to be greater than or equal to the minimum inner diameter of the accommodating hole 165. When the pressure rod 2 is at the extreme downward position, it can also play the role of closing the one-way valve 16, such as Fig. 14B shown.

[0064] Below Figures 4A-4D Take as an example, the matching status of each component when the pressure rod is in different positions is explained.

[0065] like Figure 4A As shown, the pump assembly is in an inactive state at this time. The head cap 3 is pressed down on the top of the outer ring body 11, and the convex ring 26 of the pressure rod 2 is engaged with the annular groove 116 in the opening 117 of the outer ring body 11, so that the pressure rod 2 remains in a fixed state and cannot be pressed down or moved. At the same time, the second limiting rib 25 of the pressure rod 2 is located inside the sleeve 201 of the kit 20. The piston portion 142 of the upper piston 14 is located at the top of the annular cavity 123, and the volume of the first air chamber A is 0. The upper end face 152 of the lower piston 15 is against the first limiting rib 24 of the pressure rod 2. Figure 4A In the embodiment shown, the bottom end sealing cap 22 of the pressure rod 2 is arranged at a certain distance from the one-way valve 16. Fig.14A In the illustrated embodiment, the bottom sealing cap 22 of the pressure rod 2 can also be configured to abut against the one-way valve 16, thereby pressing the one-way valve 16 to isolate the entrance, thereby preventing excessive pressure in the bottle body 901 from driving the contents into the content chamber 131 due to transportation or other reasons.

[0066] exist Figure 4B In the embodiment, when the pump assembly is activated, a sufficiently large pulling force is applied to the pressure rod 2, such as by pulling with the hand, so that the protruding ring 26 separates from the annular groove 116, the pressure rod 2 rises, and the second limiting rib 25 of the pressure rod 2 is exposed from the sleeve 20 and is located at the top of the sleeve 20. The volume of the fourth air chamber C increases rapidly, and the fourth air chamber C is under negative pressure. The one-way valve 16 is sucked up by the negative pressure of the fourth air chamber C, and is separated from the inclined surface 133, and the entrance of the content chamber 131 is opened.

[0067] When the pump is used for the first time, the pressure rod needs to be pressed several times to press the air in the content chamber 131 of the main pump body 139 out of the pump. The contents in the bottle gradually enter the content chamber 131 to replace the air discharged from the main pump body 139.

[0068] When the pump assembly is in normal use and is not subject to external forces, Figure 4B Or as shown in 4C. Press the head cap 3, press the pressure rod 2, and the pump assembly is in Figure 4C-4D The state you are in.

[0069] exist Figure 4C and 4DIn the process, the head cap 3 is continuously pressed down, and the second limiting rib 25 of the pressure rod 2 abuts against the upper end of the kit 20, thereby causing the upper piston 14 to move downward. The upper side of the piston portion 142 is the first air chamber A, and the volume of the first air chamber A gradually increases. The negative pressure in the first air chamber A increases with the increase in volume, and the volume of the fourth air chamber C gradually decreases. Since the friction between the lower piston 15 and the first shell 139 of the main pump body 13 is set to be greater than the friction between the lower piston 15 and the pressure rod 2, the pressure rod 2 drops rapidly, and the lower piston 15 does not drop in time, resulting in hysteresis. The lower piston 15 rises relative to the pressure rod 2, and the connecting hole 23 is exposed until the upper end face 152 of the lower piston 15 abuts against the first limiting rib 24. As the pressure rod 2 and the lower piston 51 move downward, the fourth air chamber C forms a positive pressure and the pressure increases as the volume decreases, forcing the contents in the content cavity 131 to enter the connecting hole 23, and then enter the hollow cavity 21 and be pumped out of the container through the head cap pump.

[0070] When the head cap 3 abuts against the top of the outer ring body 11, the piston portion 142 abuts against the extension portion 137 of the main pump body 13, and the limiting portion 144 of the upper piston 14 abuts against the first limiting rib 24, the downward pressure stops.

[0071] The external force is cancelled, and the pressure rod 2 is reset under the negative pressure of the first air chamber A. At the same time, the upper piston 14 gradually moves upward under the negative pressure of the first air chamber A, and the limit part 144 drives the kit 20 to move upward synchronously. Due to the different friction resistances, the lower piston 15 moves with a time lag relative to the pressure rod 2. The lower piston 15 first remains stationary due to the greater resistance with the inner wall of the first shell 139, until the pressure rod 2 moves upward and the top plane of the bottom cap 22 contacts the lower end surface 153 of the lower piston 15, so that the lower piston 15 moves upward with the pressure rod 2, and the connecting hole 23 is closed at this time. At the same time, the fourth air chamber C forms a negative pressure, the upper valve body 16 opens, and the contents enter the content chamber 131 from the extension tube 4 to achieve replenishment and temporary storage.

[0072] The pump assembly is provided with a receiving cavity outside the bottle mouth in the outer ring body, and multiple structures such as the upper pump body, the piston part of the upper piston and part of the piston rod are transferred to the outside of the bottle mouth, which simplifies the number and structure of the components extending into the bottle mouth, so that the pump assembly has sufficient volume to provide the air pressure required for pumping, and there is no need to consider the limitation of the inner diameter of the bottle mouth on the size of the pump assembly. It also significantly reduces the difficulty of preparing each component and effectively improves the preparation yield. At the same time, through the cooperation of the connecting hole and the lower piston, the opening or closing of the hollow cavity and the content cavity is realized, replacing the function of the original one-way valve located on the upper side of the hollow cavity, and has a good opening and closing effect.

[0073] Combined with the introduction of the above pump assembly, we can also understand a container with a content discharge function, such as Figure 1As shown, the container includes a bottle body 90 and a pump assembly, the bottle mouth 902 is connected to the outer ring body 11 of the pump assembly, and the extension tube of the pump assembly extends into the bottle body 901 to transport the contents to the content cavity for temporary storage.

[0074] The pump assembly uses air pressure to achieve pumping and resetting, and can have a faster resetting and rebounding speed than the solution using elastic force to reset. For example, compared with the traditional pump body containing plastic elastic parts, the materials of the various parts of the pump assembly are selected from common plastic materials such as PP and PE, the raw materials are easy to obtain, and the service life is long, and it can achieve tens of thousands of presses; compared with the traditional pump body containing metal elastic parts, the pump assembly is environmentally friendly and recyclable, and can also avoid corrosion.

[0075] It should be noted that the above content uses words such as "first" and "second" to limit components, which is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0076] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0077] Although the utility model is disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope defined by the claims of the utility model.

Claims

1. A pump assembly, used for assembling on a bottle body containing contents, the bottle body including a bottle mouth, the pump assembly including a pump body, a pressure rod, and a head cap, the pressure rod including a hollow cavity, characterized in that: The pump body comprises: The outer ring body comprises a first wall body and a second wall body, wherein the first wall body encloses a receiving cavity, the second wall body comprises a fixing portion, the fixing portion is used to be connected to the bottle mouth, and the receiving cavity is located outside the bottle mouth; A main pump body, at least partly located in the outer ring body, comprises a first shell and a content cavity surrounded by the first shell, at least part of the first shell and the second wall body define an annular chamber, and the annular chamber is used to accommodate the bottle mouth; The upper pump body is located in the accommodating cavity, and comprises an outer shell, an inner shell, an annular cavity defined by the outer shell and the inner shell, and an inner shell channel surrounded by the inner shell; an upper piston, located in the content chamber and the annular chamber, comprising a piston portion and a piston rod, wherein the piston rod is configured to move with the pressure rod, and the side wall of the piston portion is sealed and slidably matched with the outer shell and the inner shell, and divides the annular chamber into a first air chamber and a second air chamber by virtue of its own moving position; and A lower piston is slidably mounted on the outer periphery of the pressure rod, and the lower piston divides the content chamber into a third air chamber and a fourth air chamber by its own movement, and the third air chamber is connected to the second air chamber; Wherein, the pressure rod passes through the outer ring body, the inner shell channel, the main pump body, the upper piston and the lower piston, and the lower end extends into the content cavity.

2. The pump assembly according to claim 1, characterized in that The pressure rod further comprises a bottom end sealing cap and a communicating hole, wherein the communicating hole is communicated with the hollow cavity; The friction force between the lower piston and the first housing is set to be greater than the friction force between the lower piston and the pressure rod, and the communicating hole is closed or opened by means of the relative position of the lower piston and the pressure rod.

3. The pump assembly according to claim 2, characterized in that The pressure rod comprises a first limiting rib, and the first limiting rib and the bottom end sealing cap are respectively used to limit the lower piston in the upper and lower directions.

4. The pump assembly according to claim 1, characterized in that The pump assembly further comprises a sleeve sleeved outside the pressure rod, the sleeve comprising a sleeve and a flange at the bottom of the sleeve, The piston rod includes a piston channel, a limiting portion arranged at the bottom of the piston channel, and an orifice arranged on the limiting portion. The pressure rod passes through the piston channel and the orifice. The kit is located in the piston channel, and the flange is used to abut the limiting portion.

5. The pump assembly according to claim 4, characterized in that The pressure rod further includes a second limiting rib, and the second limiting rib is used to abut against the top of the sleeve.

6. The pump assembly of claim 1, wherein: The main pump body also includes an extension portion located at the top end of the first shell body, and an annular groove is provided at the connection between the first wall body and the second wall body, and the extension portion is embedded in the annular groove.

7. The pump assembly of claim 6, wherein: The piston portion comprises a butterfly-shaped side wall and a top recessed area, wherein the butterfly-shaped side wall is sealed and slidably matched with the inner wall of the shell, and the upper pump body comprises a downwardly extending protrusion matched with the top recessed area.

8. The pump assembly of claim 7, wherein: The piston part further comprises a column, which extends along the axial direction of the pressure rod. The lower edge of the column is longer than the lower edge of the butterfly-shaped side wall and is used to abut against the extension part.

9. The pump assembly of claim 1, wherein: The pump assembly further includes an extension tube, and the main pump body further includes a second shell located below the first shell, wherein the second shell encloses a docking cavity for connection with the extension tube.

10. The pump assembly of claim 9, wherein: The pump assembly also includes a one-way valve disposed in the docking cavity.

11. The pump assembly of claim 10, wherein: The upper side of the one-way valve includes a receiving hole, and the pressure rod includes a bottom end sealing cap, which is configured to fit with the shape of the receiving hole when the pressure rod moves downward to the limit position, thereby pressing down the one-way valve.

12. The pump assembly of claim 10, wherein: The upper side of the one-way valve includes a receiving hole, and the pressure rod includes a bottom sealing cap, the width of the bottom sealing cap is greater than or equal to the minimum inner diameter of the receiving hole, and is configured to block the receiving hole when the pressure rod moves down to the extreme position.

13. The pump assembly of claim 1, wherein: The first wall body comprises an opening at the top and an annular groove in the opening, and the pressure rod comprises a convex ring matched with the annular groove.

14. The pump assembly of claim 1, wherein: The head cap includes a delivery channel and a protrusion located in the delivery channel, the delivery channel is connected to the hollow cavity, and the pressure rod includes a groove that snaps into engagement with the protrusion.

15. The pump assembly of claim 1, wherein: The head cap includes a nozzle.

16. A container with a function of discharging contents, characterized in that: It comprises a bottle body and a pump assembly as claimed in any one of claims 1 to 15, wherein the bottle body comprises a bottle body and a bottle mouth, and the bottle mouth is connected to the outer ring body of the pump assembly.

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