Bottle filling pump structure

Abstract

The utility model relates to the technical field of gas treatment, and particularly discloses a bottle filling pump structure which comprises a pump body and a pump core, and a first piston cylinder and a second piston cylinder are arranged in the pump body and respectively provided with corresponding piston bodies. Two ends of the piston cylinder are provided with pipe orifices, and part of the pipe orifices are connected through external air pipes. The pump core is placed in the pump body through the pump cover, bearing seats are arranged in the pump body and the pump cover, two ends of the pump core are hinged to the bearing seats, and a transmission shaft extends out of the pump cover end and is connected with a driving device. Due to the fact that the gas pipe of the bottle filling pump is arranged outside the pump body, gas does not directly pass through the interior of the pump body in the conveying process and only flows in the independent piston cylinder and the gas pipe, the contact opportunity of the gas and parts in the pump body is reduced, the pollution risk is effectively reduced, and the bottle filling pump is particularly suitable for application scenes with the high requirement for gas purity. The gas can be used in the fields of medical oxygen, food-grade gas or laboratory gas and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas treatment technical field especially relates to a bottle filling pump structure. BACKGROUND

[0002] In the field of gas filling and delivery, the performance of the air pump directly affects the efficiency, safety and economy of gas filling. The traditional air pump usually adopts a single piston structure, which has a periodic idle state during the process of gas suction and discharge. This not only reduces the air filling efficiency, but also may cause gas pressure fluctuations, affecting the stability of air filling. During the air filling process of the gas cylinder, pressure control is crucial. Excessive gas pressure not only causes equipment damage, but also may cause safety accidents. Therefore, there is an urgent need for an efficient, safe and stable air pump design to meet the high requirements of modern industry and household users for gas filling. The single piston air pump in the prior art has certain limitations in performance. Its working process usually includes three stages: air suction, compression and air discharge, and the working efficiency is relatively low. In actual application, when the gas filling demand is large, the single piston pump often fails to meet the requirement of rapid air filling, resulting in prolonged air filling time. In addition, due to the pressure fluctuations generated when the gas is discharged, the traditional air pump design cannot effectively control and regulate the gas pressure. Moreover, the traditional air pump introduces gas into the air cavity and then discharges it through the air cavity. The air cavity is internally provided with pump core, piston and other components, which may contaminate the gas.

[0003] In the patent "Adjustable bottle filling pump" (Publication No. CN209179968U, hereinafter referred to as prior art 1), a bottle filling pump is disclosed. The shell assembly in prior art 1 includes a support table, a bottle filling pump, a pump head, a transmission disc, a transmission belt and a speed reducer motor. The speed reducer motor is fixed above the support table, the bottle filling pump is located on the right side of the speed reducer motor, and the transmission disc is connected with the speed reducer motor. The transmission belt connects the two ends of the motor and the transmission disc, and the pump head is fixed on the output end of the transmission disc. The heat dissipation assembly is composed of a pulley, a connecting frame, a small motor and a fan blade. The connecting frame is slidable, the pulley and the small motor are fixed on the connecting frame, and the fan blade is connected to the output end of the small motor. The adjustment assembly includes a fixed table, an adjustment frame, a bearing, a gear ring and a motor. The fixed table is located above the support table, the adjustment frame is fixed above the fixed table, the bearing and the gear ring are located in the adjustment frame, the large motor is close to the front of the adjustment frame, and the gear shaft connects the rear end of the large motor. Through the combination of the adjustment frame, the small motor and the fan blade, the angle adjustment and heat dissipation effect of the bottle filling pump are realized, which is convenient for the operator to operate.

[0004] Although the existing technology 1 has made the operation of the bottle filling pump relatively convenient and fast, when the bottle filling pump is in the process of gas filling, the gas will inevitably pass through its internal structure and come into contact with the piston and other key components. This contact may adversely affect the purity of the gas, thereby affecting the quality and use effect of the gas. Utility model content

[0005] Therefore, the utility model embodiment provides a bottle filling pump structure to solve the problem that the bottle filling pump affects the purity of gas when filling gas.

[0006] The utility model embodiment provides a bottle filling pump structure, which comprises a pump body and a pump core arranged in the pump body, the pump body is hollow and used for accommodating the pump core, first and second piston cylinders are arranged on the pump body at intervals, the first and second piston cylinders are in communication with the interior of the pump body, the pump core is respectively provided with first and second piston bodies in the first and second piston cylinders, two pipe openings are arranged at the end of the first and second piston cylinders away from the pump body, two pipe openings of the first and second piston cylinders are communicated through an air pipe arranged outside the pump body, the pump core is arranged in the pump body by opening a pump cover, bearing seats are arranged in the pump body and the pump cover, the two ends of the pump core are respectively hinged to the bearing seats on the pump body and the pump cover, and a transmission shaft is further arranged at one end of the pump core, and the pump core is in transmission connection with a driving device through the transmission shaft.

[0007] Preferably, the two pipe openings arranged at the end of the first piston cylinder away from the pump body are a gas inlet and a first gas outlet, and the gas inlet, the first gas outlet and the cylinder body of the first piston cylinder are arranged in a three-way mode.

[0008] According to the bottle filling pump structure of the utility model, the two pipe openings arranged at the end of the second piston cylinder away from the pump body are a gas outlet and a second gas outlet, and the gas outlet, the second gas outlet and the cylinder body of the second piston cylinder are arranged in a three-way mode.

[0009] Preferably, the first and second gas outlets are communicated through the air pipe to form a gas conveying flow channel, and negative pressure valve cores are arranged on the gas inlet and the second gas outlet.

[0010] Preferably, the pump core is provided with first and second connecting ends, the first and second connecting ends are arranged at a preset interval and angle, and the first and second piston bodies are connected to the first and second connecting ends through first and second piston rods, respectively.

[0011] Preferably, the two ends of the first piston rod are respectively hinged to the first piston body and the first connecting end, and the two ends of the second piston rod are respectively hinged to the second piston body and the second connecting end.

[0012] Preferably, the driving device drives the pump core to rotate, and the first connecting end and the second connecting end drive the first piston body and the second piston body to alternately perform the telescopic movement in the first piston cylinder and the second piston cylinder, respectively.

[0013] Preferably, the first piston body moves to an end away from the pump core, and the second piston body moves to an end close to the pump core; the air inlet is closed, and the second air outlet is opened.

[0014] Preferably, the first piston body moves to an end close to the pump core, and the second piston body moves to an end away from the pump core; the air inlet is opened, and the second air outlet is closed.

[0015] Preferably, the pump body is provided with a first opening and a second opening; the first opening and the second opening are in communication with the interior of the pump body; the first piston cylinder and the second piston cylinder are fixedly connected to the pump body through fasteners, and the first piston cylinder and the second piston cylinder are sealingly arranged with the first opening and the second opening.

[0016] The bottle filling pump structure provided by the utility model has the following beneficial effects:

[0017] Since the air pipe of the bottle filling pump is arranged outside the pump body, the gas does not directly pass through the interior of the pump body in the conveying process, but only flows in the independent piston cylinder and the air pipe, the contact opportunity of the gas and the internal parts of the pump body is reduced, the pollution risk is effectively reduced, and the bottle filling pump is especially suitable for application scenarios with high requirements for gas purity, such as medical oxygen, food-grade gas or laboratory gas and the like. Through the alternating working mode of the first piston and the second piston, the pump can realize the continuous gas suction and exhaust process, the idle stage in the single-piston design is avoided, and therefore the gas filling efficiency of the pump is improved. The gas can be more continuously and stably conveyed into the target container, and the gas filling time is shortened. Since the gas does not directly enter the interior of the pump body, the main structure in the interior of the pump does not directly contact the gas, and the loss of the internal parts due to the corrosion or wear of the gas is reduced. The pump body can maintain good mechanical properties, and therefore the service life of the equipment is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments of the utility model, for the ordinary skilled in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings, these are within the protection scope of the utility model.

[0019] Figure 1 It is a bottle filling pump structure schematic diagram;

[0020] Figure 2Fig. 1 is a schematic view of a pump core structure of a bottle filling pump structure;

[0021] Figure 3 Fig. 2 is a schematic view of a bottle filling operation of the bottle filling pump structure;

[0022] Parts and numbers in the figures:

[0023] 100 - bottle filling pump

[0024] 200 - pump body, 210 - first opening, 211 - first piston cylinder, 212 - air inlet, 213 - first air outlet, 220 - second opening, 221 - second piston cylinder, 222 - air outlet, 223 - second air outlet, 224 - negative pressure valve core, 230 - air pipe, 240 - fastener

[0025] 300 - pump core, 310 - transmission shaft, 321 - first piston body, 322 - second piston body, 331 - first connecting end, 332 - second connecting end, 333 - first piston rod, 334 - second piston rod

[0026] 400 - pump cover

[0027] 500 - inner cavity

[0028] 600 - gas tank DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. It should be noted that, in this article, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between the entities or operations. In the description of the utility model, it should be understood that the orientation or positional relationship indicated by terms such as center, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner and outer is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements. If there is no conflict, the embodiments of the utility model and various features in the embodiments can be combined with each other, and all within the protection scope of the utility model.

[0030] Embodiment 1

[0031] Please refer to Figure 1 and Figure 3 The embodiments of the utility model provide a bottle filling pump structure, in the current gas filling transportation process, usually bottle filling pump is used to input gas from external gas source into gas tank 600 or other gas storage device. These bottle filling pumps suck or discharge gas through the negative pressure or positive pressure action of the piston, thereby completing the gas filling transportation task. However, in this process, gas needs to pass through the internal structure of the bottle filling pump. The bottle filling pump is usually equipped with pump core or piston and other key components, and these components may cause a certain degree of pollution to the gas during operation. Such pollution may adversely affect the purity of the gas, thereby affecting the quality and use effect of the gas.

[0032] The bottle filling pump 100 of the utility model adopts a unique design, and the gas pipe 230 is directly arranged outside the pump body 200, so that the gas is output from the gas pipe 230 without passing through the inside of the pump body 200. The advantage of this design is that the gas will not contact any components inside the pump body 200 during transmission, thereby effectively avoiding possible pollution inside. In this way, the purity of the gas is guaranteed, and the hygiene and safety of the bottle filling process are ensured. In addition, this design also simplifies the structure of the pump body 200, reduces the difficulty of maintenance and cleaning, and improves the service life and working efficiency of the bottle filling pump 100. Moreover, the gas pipe 230 is arranged outside the pump body 200, and the gas will not be polluted without passing through the inside of the pump body 200.

[0033] Please refer to Figure 1 In the embodiment, a bottle filling pump 100 is provided, which comprises a pump body 200 and a pump core 300 arranged inside the pump body 200. The pump body 200 is designed in a hollow shape to form an internal space, i.e. an inner cavity 500, which mainly functions to accommodate the pump core 300. In this way, the pump core 300 can freely rotate inside the pump body 200, thereby effectively helping to realize the work of introducing or discharging gas.

[0034] Please refer to Figure 2 Further, the surface of the pump body 200 is provided with two important components, i.e. a first piston cylinder 211 and a second piston cylinder 221, at intervals. The two piston cylinders are in communication with the inside of the pump body 200, ensuring that the components of the pump core 300 can move inside the inner cavity 500 and the piston cylinders. Inside the pump core 300, a first piston body 321 and a second piston body 322 corresponding to the first piston cylinder 211 and the second piston cylinder 221 are arranged, respectively. The two piston bodies are driven by the rotation of the pump core 300, so that they perform extension and contraction movements inside the respective piston cylinders. The extension and contraction movements are performed alternately, i.e. when one piston body performs a suction action, the other piston body performs a discharge action, and vice versa. Through the alternating extension and contraction movements, the suction and discharge actions of the bottle filling pump 100 are realized, thereby ensuring the continuous flow of gas and the efficient work of the pump.

[0035] Please refer to Figure 1In this embodiment, the first piston cylinder 211 and the second piston cylinder 221 are each provided with two pipe openings at the end away from the pump body 200. The two pipe openings are respectively used to achieve the actions of gas suction and discharge. Specifically, the two pipe openings at the end of the first piston cylinder 211 are respectively used to suck and discharge gas, while the two pipe openings at the end of the second piston cylinder 221 are respectively used to receive and discharge gas. The flow process of the gas is as follows: the gas is first sucked by one pipe opening at the end of the first piston cylinder 211, then sent to one pipe opening at the end of the second piston cylinder 221 through the gas pipe 230, and finally discharged from the other pipe opening at the end of the second piston cylinder 221. In this way, the gas suction or discharge operation is achieved.

[0036] In order to ensure the sealing of the gas during transportation and prevent gas leakage or impurities from entering, the gas pipe 230 is sealingly arranged between the two pipe openings. This sealing arrangement not only ensures smooth flow of the gas, but also avoids possible contamination of the gas during transportation. In addition, by arranging the gas pipe 230 outside the pump body 200, the possibility of contamination of the gas entering the interior of the pump body 200 and then being discharged is avoided, thereby further improving the reliability and safety of gas delivery. The efficiency and delivery quality of gas transportation are improved, and the stable operation of the entire system is ensured, providing a strong guarantee for efficient and safe gas delivery.

[0037] Please refer to Figure 1 and Figure 3 The pump body 200 is arranged inside the pump body 200 by opening the pump cover 400. The pump cover 400 is mainly arranged to facilitate the installation of the pump core 300 and the maintenance of the inner cavity 500 of the pump body 200 or the pump core 300. Although the pump cover 400 and the pump body 200 are connected in a detachable manner, in order to ensure the sealing of the interior and prevent gas leakage from the inner cavity 500, the sealing performance of the connection must be good. In this way, when the internal piston moves, a positive or negative pressure environment can be effectively achieved, thereby ensuring the normal operation of the pump body 200.

[0038] In the present embodiment, the pump body 200 and the pump cover 400 are both internally provided with bearing seats for mounting the pump core 300. These bearing seats are arranged at corresponding positions of the pump body 200 and the pump cover 400, so that the two ends of the pump core 300 can be connected with the bearing seats. Through this design, the pump core 300 can rotate freely on the bearing seats, thereby ensuring the stability and reliability of the pump. In order to further improve the rotation efficiency of the pump core 300 and the automation degree of the operation, a transmission shaft 310 is further arranged at one end of the core extending to the pump cover 400. The transmission shaft 310 functions to transmit the power of the external driving device to the pump core 300, thereby realizing fully automated gas bottle filling operation. Specifically, the transmission shaft 310 transmits the power of the driving device to the pump core 300 through transmission connection, so that the pump core 300 can rotate efficiently and stably under the driving of the driving device.

[0039] Please refer to Figure 1 , it is further described in detail that the two pipe openings arranged at the end away from the pump body 200 of the first piston cylinder 211 are used as the air inlet 212 and the first gas outlet 213, respectively. The two pipe openings and the cylinder body of the first piston cylinder 211 are designed in a three-way structure. Such design enables the gas sucked from the air inlet 212 to be temporarily stored in the space between the air inlet 212 and the first piston cylinder 211. When this gas is squeezed by the moving first piston body 321, it will be pushed into the first gas outlet 213, and then into the gas pipe 230 and delivered to the other end.

[0040] Similarly, the second piston cylinder 221 is also provided with two pipe openings at the end away from the pump body 200, which are used as the gas outlet 222 and the second gas outlet 223, respectively. The two pipe openings and the cylinder body of the second piston cylinder 221 are also designed in a three-way structure. Through this three-way arrangement, when negative pressure is generated in the first piston cylinder 211, the second gas outlet 223 will be opened, at which time the gas in the gas pipe 230 will enter the space between the gas outlet 222 and the second piston cylinder 221. When the internal pressure of the second piston cylinder 221 reaches a positive pressure, the gas will be sent into the gas tank 600, thereby realizing the bottle filling operation. This design ensures smooth flow of gas between the two piston cylinders, thereby improving the efficiency and reliability of the entire system.

[0041] Please refer to Figure 1The first gas inlet 213 and the second gas inlet 223 are connected to each other through the gas pipe 230, thus forming a complete gas conveying channel. In order to ensure smooth gas conveying and prevent gas backflow, the gas inlet 212 and the second gas inlet 223 are both equipped with negative pressure valve cores 224. The negative pressure valve cores 224 are opened under negative pressure and closed under normal pressure, thus effectively avoiding gas backflow during conveying.

[0042] Further, when the first piston body 321 moves away from the pump core 300, the second piston body 322 moves towards the pump core 300. In this process, the gas inlet 212 is closed, while the first gas inlet 213 remains open. Due to the movement of the first piston body 321, the gas between the gas inlet 212 and the inside of the first piston cylinder 211 is squeezed, and the squeezed gas enters the gas pipe 230 through the first gas inlet 213 which is always open. At the same time, the second gas inlet 223 is opened under the action of negative pressure, and the gas is discharged from the gas pipe 230 through the second gas inlet 223. It should be noted that the discharged gas is still under negative pressure at this time and has not yet been discharged to the external environment through the gas outlet 222.

[0043] Further, when the first piston body 321 moves towards the pump core 300, and the second piston body 322 moves away from the pump core 300, the gas inlet 212 is opened under the action of negative pressure, and the gas provided by the external gas supply device enters the position between the gas inlet 212 and the inside of the first piston cylinder 211. At the same time, the second gas inlet 223 is not affected by negative pressure and remains closed. In this case, the gas in the position between the gas inlet 212 and the inside of the first piston cylinder 211 cannot be discharged through the first gas inlet 213 due to the action of negative pressure. However, the gas between the inside of the second piston cylinder 221 and the gas outlet 222 is squeezed by positive pressure and is discharged into the gas pipe 230, completing a bottle-filling action. Further, negative pressure valve cores are also provided at the first gas inlet 213 and the gas outlet 222, and the directions of the two negative pressure valve cores are opposite to those of the gas inlet 212 and the second gas inlet 223, thus avoiding interference between the mutually affected valve ports. When the gas inlet 212 or the second gas inlet 223 works, the first gas inlet 213 or the gas inlet 212 is closed; when the second gas inlet 223 or the gas outlet 222 works, the gas outlet 222 or the second gas inlet 223 is closed. By repeatedly implementing the above actions of the first piston body 321 and the second piston body 322, multiple gas suction or discharge operations can be continuously performed, thus ensuring efficient operation of the entire gas conveying system.

[0044] In a preferred embodiment, the pump core 300 is provided with two connection ends, namely a first connection end 331 and a second connection end 332. These two connection ends are arranged with a certain preset interval and angle to ensure that they can be staggered. This design allows the first piston body 321 and the second piston body 322 to be connected to the two connection ends through the respective piston rods, namely the first piston rod 333 and the second piston rod 334.

[0045] Further, in order to ensure flexibility and reliability of the connection, in a preferred embodiment, the two ends of the first piston rod 333 are connected to the first piston body 321 and the first connection end 331 through a hinged connection. Similarly, the two ends of the second piston rod 334 are also connected to the second piston body 322 and the second connection end 332 through a hinged connection. This hinged design not only ensures a certain degree of freedom of the piston rod during movement, but also effectively transmits torque, thereby ensuring the normal operation of the pump core 300.

[0046] Under the action of the driving device, the pump core 300 can realize rotational movement. With the rotation of the pump core 300, the first connection end 331 and the second connection end 332 drive the first piston body 321 and the second piston body 322 to perform alternating extension and retraction movements in the respective piston cylinders. This movement mode allows the pump core 300 to effectively suck in and discharge fluid, thereby realizing the pumping function. Through this design, the pump core 300 can efficiently complete its work and ensure stable operation of the entire pump system.

[0047] In a preferred embodiment, the structure of the pump body 200 includes two main opening parts. Specifically, the pump body 200 is provided with a first opening 210 and a second opening 220, which are directly communicated with the internal space of the pump body 200. In order to ensure the sealing performance of the pump body 200, the first piston cylinder 211 and the second piston cylinder 221 are fixedly connected to the pump body 200 through fasteners 240. The fasteners 240 can be bolts, screws or other similar fixing devices to ensure that there is no leakage between the piston cylinder and the pump body 200. In addition, the first piston cylinder 211 and the second piston cylinder 221 are sealed with the first opening 210 and the second opening 220, which means that sealing materials or sealing structures are used at the contact parts between the piston cylinder and the opening to prevent fluid leakage between the inside and outside of the pump body 200. This sealing arrangement not only improves the efficiency of the pump, but also ensures the stability and reliability of the pump during operation.

[0048] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pump structure for a bottle, characterized by, The utility model provides a kind of pump, including pump body (200) and be located in the pump core (300) of the pump body (200) inside;The pump body (200) is hollow for accommodating pump core (300);First piston cylinder (211) and second piston cylinder (221) are spaced apart on the pump body (200), and the first piston cylinder (211) and second piston cylinder (221) are communicated with the inside of the pump body (200); The pump core (300) is respectively provided with first piston body (321) and second piston body (322) in the first piston cylinder (211) and second piston cylinder (221);The first piston cylinder (211) and second piston cylinder (221) are provided with two pipe mouths at the end away from the pump body (200);Two pipe mouths of the first piston cylinder (211) and second piston cylinder (221) are communicated by air pipe (230) arranged outside the pump body (200); The pump body (200) is placed in the pump body (200) by opening pump cover (400) to the pump core (300);Bearing seat is arranged in the pump body (200) and pump cover (400);Two ends of the pump core (300) are respectively hinged with the bearing seat on the pump body (200) and pump cover (400), and the pump core (300) is further provided with transmission shaft (310) at one end of the pump cover (400);The pump core (300) is drivingly connected with driving device by transmission shaft (310).

2. A pump structure for a bottle as claimed in claim 1, wherein The two pipe mouths arranged at the end away from the pump body (200) of the first piston cylinder (211) are gas inlet (212) and first gas outlet (213), and the gas inlet (212), first gas outlet (213) and cylinder body of the first piston cylinder (211) are arranged in a tee type.

3. A pump structure for a bottle as claimed in claim 2, wherein The two pipe mouths arranged at the end away from the pump body (200) of the second piston cylinder (221) are gas outlet (222) and second gas outlet (223), and the gas outlet (222), second gas outlet (223) and cylinder body of the second piston cylinder (221) are arranged in a tee type.

4. A pump structure for a bottle according to claim 3, wherein The first gas outlet (213) and second gas outlet (223) are communicated by air pipe (230) to form a gas conveying flow channel, and negative pressure valve core (224) is arranged on the gas inlet (212) and second gas outlet (223).

5. A pump structure for a bottle according to claim 4, wherein The pump core (300) is provided with first connecting end (331) and second connecting end (332), and the first connecting end (331) and second connecting end (332) are staggered and arranged at a preset interval and angle.

6. A pump structure for a bottle according to claim 5, wherein Two ends of the first piston rod (333) are respectively hinged with the first piston body (321) and first connecting end (331), and two ends of the second piston rod (334) are respectively hinged with the second piston body (322) and second connecting end (332).

7. A pump structure for a bottle according to claim 6, wherein The driving device drives the pump core to rotate, and the first connecting end (331) and the second connecting end (332) drive the first piston body (321) and the second piston body (322) to alternately perform the telescopic movement in the first piston cylinder (211) and the second piston cylinder (221) respectively.

8. A pump structure for a bottle according to claim 7, wherein The first piston body (321) moves to an end away from the pump core (300), and the second piston body (322) moves to an end close to the pump core; the air inlet (212) is closed, and the second air outlet (223) is opened.

9. A pump structure for a bottle according to claim 7, wherein The first piston body (321) moves to an end close to the pump core (300), and the second piston body (322) moves to an end away from the pump core (300); the air inlet (212) is opened, and the second air outlet (223) is closed.

10. A pump structure for a bottle according to claim 1, wherein The pump body (200) is provided with a first opening (210) and a second opening (220); the first opening (210) and the second opening (220) are in communication with the inside of the pump body (200); the first piston cylinder (211) and the second piston cylinder (221) are fixedly connected with the pump body (200) through fasteners (240), and the first piston cylinder (211) and the second piston cylinder (221) are sealingly arranged with the first opening (210) and the second opening (220).

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