CN113525910B - Emulsion pump - Google Patents

Abstract

The invention discloses an emulsion pump, which comprises a pump body, a first piston, a second piston, a first one-way valve and a second one-way valve; the pump body is provided with a suction pipe, an output pipe, an air inlet and an air outlet; The first piston is located in the pump body, which divides the inside of the pump body into a medium cavity and an air pressure cavity; one end of the suction pipeline communicates with the medium cavity, and the other end extends into the container; one end of the output pipeline communicates with the medium cavity, and the other end extends out of the pump body ;The first one-way valve allows the medium to flow into the medium cavity through the suction pipeline in one direction; the second one-way valve allows the medium to flow into the output pipeline in one direction; the air inlet connects the air pressure chamber with the outside atmosphere, and the air outlet communicates with the container; The piston is located in the air pressure chamber, and the second piston is provided with an auxiliary air channel, one end communicates with the air pressure chamber, and the other end selectively communicates with the air outlet; when the first piston moves relative to the pump body, the second piston moves relative to the pump body to transfer the auxiliary air. The channel communicates with the gas outlet. The lotion pump of the present invention can improve the protection of the medium in the container.

Description

a lotion pump

technical field

The invention belongs to the technical field of emulsion pumps, and in particular relates to an emulsion pump.

Background technique

At present, lotion pumps are installed on containers containing lotion, so that people can obtain lotion by pressing the pressure head, which not only facilitates people's use, but also saves raw materials. Therefore, containers with lotion pumps are widely used in household and medical applications. and other occasions.

However, the lotion pump used in the existing container often has the following problems during use: the lotion pump needs to maintain the balance of the air pressure in the bottle and the atmospheric pressure to work normally, so there will be a gap between the pressure head and the pump body, and There will also be a channel for air circulation on the lotion pump, so that sewage can enter the cavity formed by the pressure head and the pump body, or enter the bottle from the air flow channel, thereby polluting the lotion in the bottle. In addition, after using the lotion pump, there will be lotion residue in the pressure head and the nozzle, and the lotion will flow out and drip from the nozzle, polluting the environment, and the lotion remaining on the nozzle head will cause nozzle blockage after long-term air drying, affecting the lotion pump normal use.

Contents of the invention

Aiming at the above-mentioned problems existing in the working process of the existing lotion pump, the present invention proposes a lotion pump. The lotion pump includes a pump body, a first piston, a second piston, a first one-way valve and a second one-way valve; Gas port; the first piston is located inside the pump body, and divides the inside of the pump body to form a medium cavity and an air pressure cavity; one end of the suction pipe communicates with the medium cavity, and the other end extends to the container Inside, one end of the output pipe communicates with the medium chamber, and the other end protrudes to the outside of the pump body; the first one-way valve is located between the suction pipe and the medium chamber, allowing the medium to flow into the medium cavity; the second check valve is located between the output pipeline and the medium cavity, so that the medium flows into the output pipeline in one direction; the air inlet connects the air pressure cavity and the external air pressure The air outlet is in communication with the inside of the container; the second piston is located in the air pressure chamber, and an auxiliary air passage is provided on the second piston, and one end of the auxiliary air passage communicates with the air pressure chamber , the other end selectively communicates with the air outlet; wherein, when the first piston moves relative to the pump body, the second piston moves relative to the pump body to connect the auxiliary airway with the air outlet connected.

Preferably, after the pump body is connected to the container, the height of the end of the auxiliary air channel that communicates with the air pressure cavity is higher than the height of the position where the air inlet communicates with the external air pressure.

Preferably, the second piston divides the air pressure chamber, a liquid discharge chamber is formed between the first piston and the second piston, and the first piston is provided with a first liquid discharge channel and The second liquid discharge channel; one end of the first liquid discharge channel communicates with the air pressure cavity, and the other end communicates with the liquid discharge cavity, and a third one-way valve is provided on the first liquid discharge channel, so that The liquid flows into the liquid discharge chamber in one direction from the air pressure chamber; one end of the second liquid discharge channel communicates with the liquid discharge chamber, and the other end communicates with the outside of the pump body, and the second liquid discharge channel A fourth one-way valve is arranged on the passage, so that the liquid flows out of the pump body in one direction from the discharge chamber.

Further preferably, the third one-way valve and/or the fourth one-way valve are composed of steel balls and springs.

Preferably, the lotion pump is also provided with a third piston, a fifth one-way valve and a sixth one-way valve; the third piston is fixedly connected with the first piston and is located in the air pressure chamber, and the second The piston is located between the first piston and the third piston, the third piston divides the air pressure chamber, and a suction chamber is formed between the third piston and the second piston; The fifth one-way valve is located between the suction chamber and the output pipeline, so that the medium flows into the suction chamber from the output pipeline in one direction; the sixth one-way valve is located between the suction chamber and the output pipeline. Between the output pipes, the medium flows into the output pipes from the suction chamber in one direction.

Further preferably, when the first piston moves relative to the pump body in the direction of reducing the volume of the medium chamber, the second piston moves relative to the pump body in a direction close to the third piston.

Further preferably, the fifth one-way valve and/or the sixth one-way valve are composed of steel balls and springs.

Preferably, the lotion pump is also provided with a handle; the handle is located outside the pump body and is rotatably connected to the pump body; the first piston is rotatably connected to the handle through a first piston rod, and the The second piston is rotationally connected with the handle through the second piston rod, and the connection point between the first piston rod and the handle and the connection point between the second piston rod and the handle are located between the handle and the pump body both sides of the connection point.

Further preferably, the lotion pump is also provided with a piston elastic member; the piston elastic member is located between the pump body and the first piston, so as to drive the first piston relative to the pump body to increase the Move in the direction of the medium chamber volume.

Preferably, the first one-way valve and/or the second one-way valve adopts a ball valve structure.

The emulsion pump of the present invention has the following beneficial technical effects:

1. In the lotion pump of the present invention, by providing an air inlet and an air outlet on the pump body, an auxiliary air passage is provided on the second piston, and one end of the auxiliary air passage is kept in communication with the air inlet through the air pressure chamber, and the other One end communicates with the interior of the container through selective communication with the gas outlet. In this way, the air pressure cavity and the auxiliary air channel are arranged between the air inlet and the air outlet, and the auxiliary air channel and the air outlet are communicated with each other when the second piston moves with the first piston, so that the inside of the container is kept in communication with the external atmospheric pressure. , to ensure the normal output of the emulsion pump to the medium, and when the second piston moves with the first piston to stop the output of the medium in the container, then the auxiliary air channel is disconnected from the air outlet, so as to prevent external impurities from entering the container. The air port directly enters the purpose of the container to improve the protection of the medium in the container.

2. In the lotion pump of the present invention, by setting the auxiliary air passage on the second piston rod, and making the height of the end of the auxiliary air passage communicated with the air pressure chamber higher than the position of the air inlet on the pump body, thereby It can effectively prevent the external sewage entering the air pressure chamber through the air inlet from entering the auxiliary air passage, further achieve the protection of the medium in the container, and improve the safety and reliability of using the emulsion pump.

3. In the lotion pump of the present invention, by setting a liquid discharge chamber between the first piston and the second piston, the first piston rod is provided with a first liquid discharge flow channel, a second liquid discharge flow channel, and a third single discharge channel. One-way valve and the fourth one-way valve, so that during the reciprocating movement of the first piston and the second piston, the external sewage that enters the air pressure chamber through the air inlet can be introduced into the discharge chamber and then discharged to the outside of the pump body, further reducing The possibility of external sewage entering the container through the air inlet improves the protection of the medium in the container.

4. In the lotion pump of the present invention, by setting the third piston on the first piston rod, a suction chamber is provided between the third piston and the second piston, and a fifth unit is provided between the suction chamber and the output pipeline. One-way valve and the sixth one-way valve, so that the medium remaining in the output pipeline after the emulsion pump outputs the medium can be sucked back into the suction chamber in time through the fifth one-way valve, and then output to the output pipeline through the sixth one-way valve And it is output together with the medium in the medium chamber, effectively avoiding the overflow of the medium in the output pipeline and air-drying blockage.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the lotion pump of the present embodiment;

Fig. 2 is a schematic diagram of the structure between the first piston, the third piston and the first piston rod in the lotion pump of this embodiment;

Fig. 3 is a schematic diagram of the structure between the second piston and the second piston rod in the lotion pump of this embodiment.

Detailed ways

The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in FIG. 1 to FIG. 3 , the lotion pump of this embodiment includes a pump body 1 , a first piston 21 , a second piston 22 , a first one-way valve 31 and a second one-way valve 32 . The pump body 1 is detachably fixedly connected to the container through threads, and the pump body 1 is provided with a suction pipe 11 , an output pipe 12 , an air inlet 13 and an air outlet 14 . The first piston 21 is located inside the pump body 1 and can move reciprocally and linearly relative to the pump body 1 , and divides the inside of the pump body 1 to form a medium chamber 151 and an air pressure chamber 152 .

One end of the suction pipe 11 communicates with the medium cavity 151 , and the other end extends to the inside of the container for introducing the medium in the container into the medium cavity 151 . One end of the output pipe 12 communicates with the medium cavity 151 , and the other end protrudes to the outside of the pump body 1 for outputting the medium in the medium cavity 151 . The first one-way valve 31 is located between the suction pipe 11 and the medium chamber 151 to allow the medium in the container to flow into the medium chamber 151 in one direction. The second one-way valve 32 is located between the output pipeline 12 and the medium chamber 151 , so that the medium in the medium chamber 151 flows into the output pipeline 12 in one direction. The air inlet 13 is located near the upper end of the pump body 1 and communicates the air pressure chamber 152 with the outside atmosphere, while the air outlet 14 is located near the lower end of the pump body 1 and is used to communicate with the inside of the container.

The second piston 22 is located in the air pressure chamber 152 and can move back and forth linearly relative to the pump body 1 , and an auxiliary air channel 221 is provided on the second piston 22 . Wherein, one end of the auxiliary air passage 221 is in communication with the air pressure cavity 152 , and the other end extends to the outer circumferential surface of the second piston 22 and forms selective communication with the air outlet 14 . When the first piston 21 reciprocates relative to the pump body 1 , the second piston 22 moves relative to the pump body 1 to communicate the auxiliary air channel 221 with the air outlet 14 .

When the first piston is driven to move in the direction of increasing the volume of the medium chamber in the pump body, the air pressure in the medium chamber decreases due to the increase in its volume, so that the first one-way valve is opened and the second one-way valve is closed, and the medium in the container It flows into the medium chamber through the suction pipe, and at the same time, the second piston moves to the position where the auxiliary air passage communicates with the air outlet, so that the air pressure in the container passes through the air outlet, auxiliary air passage, air pressure chamber and air inlet in sequence to communicate with the outside world. Atmospheric pressure remains connected, so that the medium in the container can flow into the medium chamber quickly and smoothly; when the first piston is driven to move in the direction of reducing the volume of the medium chamber in the pump body, the air pressure in the medium chamber will increase due to its volume reduction, Therefore, the first one-way valve is closed and the second one-way valve is opened, and the medium in the medium chamber is output through the output pipeline 12 under the drive of air pressure, and the output operation of the medium in the container is completed.

As shown in FIG. 1 , in the lotion pump of this embodiment, a handle 4 is also provided, and the handle 4 is located outside the pump body 1 and is rotationally connected to the pump body 1 through a rotating shaft 41 . At the same time, the first piston 21 is provided with a first piston rod 51, one end of the first piston rod 51 is fixedly connected to the first piston 21, and the other end extends out of the pump body 1 through the air pressure chamber 152, and is passed through the pin Form a rotary connection with the handle 4. The second piston 22 is provided with a second piston rod 52, one end of the second piston rod 52 is fixedly connected to the second piston 22, and the other end passes through the air pressure cavity 152 to extend to the outside of the pump body 1, and is connected to the handle through the pin shaft. 4 to form a rotating connection. Wherein, the connection point between the first piston rod 51 and the handle 4 and the connection point between the second piston rod 52 and the handle 4 are located on both sides of the connection point between the handle 4 and the pump body 1 .

At this time, the first piston rod and the second piston rod form a rotational connection with the handle at the same time, and form a seesaw structure driven by the handle, that is, when the driving end of the handle moves downward in the direction shown in Figure 1, the rotating shaft is used as the fulcrum. , the handle drives the first piston rod to move down, and at the same time the handle drives the second piston rod to move up. On the contrary, when the handle drives the first piston rod to move up, the handle drives the second piston rod to move down at the same time, thus forming a Synchronized movement control with the second piston inside the pump body.

Similarly, in other embodiments, other driving mechanisms may be used to drive and control the first piston and the second piston independently according to different design and working conditions, and through the cooperative control of the driving mechanism, the control of the first piston and the second piston may be achieved. The movement association control of the piston and the drop two piston.

Further, in the lotion pump of this embodiment, a piston elastic member 6 is also provided. Wherein, the piston elastic member 6 adopts a coil spring and is located in the medium chamber 151 between the pump body 1 and the first piston 21 to drive the first piston 21 to move relative to the pump body 1 to increase the volume of the medium chamber 151 .

At this time, after the driving force on the handle is released, the first piston can move relative to the pump body under the restoring force of the elastic part of the piston, and then the first piston rod drives the handle to rotate, and then passes through the second The two piston rods drive the second piston to move synchronously, thereby realizing the automatic reset of the handle and the positions of the first piston and the second piston.

In addition, two connecting grooves 42 are provided on the handle 4 of this embodiment, respectively for accommodating the pin shaft connected to the first piston rod 51 and the pin shaft connected to the second piston rod 52 for reciprocating sliding. In this way, the handle can smoothly drive the first piston rod and the second piston rod to reciprocate in the linear direction, avoiding the jamming during the driving process of the first piston rod and the second piston rod, and improving the working stability of the lotion pump reliability.

As shown in FIG. 1 and FIG. 3 , for the design that the air inlet 13 is opened in the pump body 1 near the upper end, the end of the auxiliary air channel 221 that communicates with the air pressure chamber 152 is extended to the upper end of the second piston rod 52 , The height of the position where the auxiliary air passage 221 communicates with the air pressure cavity 152 is higher than the height of the position where the air inlet 13 communicates with the external air pressure, and the top of the second piston rod 52 is designed as a protective cover structure to protect the auxiliary air passage 221. Carry out isolation protection.

In this way, during the working process of the emulsion pump, even if there is external sewage flowing into the air pressure chamber through the air inlet, since the position where the auxiliary air channel communicates with the air pressure chamber is higher than the position of the air inlet, the external sewage will flow under the action of its own weight. It falls on the bottom of the air pressure cavity, so as to be far away from the auxiliary air channel, so as to prevent the risk of external sewage entering the container through the air inlet, and improve the protection of the medium in the container.

As shown in FIG. 1 , in this embodiment, the second piston 22 divides the air pressure chamber 152, a liquid discharge chamber 153 is formed between the first piston 21 and the second piston 22, and the first piston rod 51 is provided with a There are a first liquid discharge channel 511 and a second liquid discharge channel 512 . Wherein, one end of the first liquid discharge channel 511 is kept in communication with the air pressure chamber 152, and the other end is kept in communication with the liquid discharge chamber 153, and a third check valve 33 is arranged on the first liquid discharge channel 511 to allow the liquid to pass through the air pressure chamber. 152 flows into the discharge chamber 153 in one direction. One end of the second liquid discharge channel 512 communicates with the liquid discharge chamber 153, and the other end extends to communicate with the outside of the pump body 1, and the second liquid discharge channel 512 is provided with a fourth one-way valve 34 to allow the liquid to pass through the liquid discharge chamber. 153 flows out of the pump body 1 in one direction.

At this time, when the first piston and the second piston move relatively to increase the volume of the liquid discharge chamber, the air pressure in the liquid discharge chamber decreases, and the air pressure in the air pressure chamber drives the third one-way valve to open, so that the liquid remaining in the air pressure chamber The liquid inside, such as the external sewage flowing in through the air inlet, flows into the discharge chamber through the first discharge channel; when the first piston and the second piston move in opposite directions to reduce the volume of the discharge chamber, the discharge The air pressure in the chamber rises, the third one-way valve is closed and the fourth one-way valve is opened, so that the liquid in the liquid discharge chamber is discharged to the outside of the pump body through the second liquid discharge channel. In this way, the external sewage flowing into the air pressure cavity through the air inlet can be discharged in time, and the protection of the medium in the container during the use of the emulsion pump can be further improved.

As shown in FIG. 1 , in the lotion pump in this embodiment, a third piston 23 , a fifth one-way valve 35 and a sixth one-way valve 36 are also provided. Wherein, the third piston 23 is located in the air pressure chamber 152 and is sleeved and fixed on the first piston rod 51 in a parallel relationship with the first piston 21 so as to form a fixed connection with the first piston 21 . The second piston 22 is located between the first piston 21 and the third piston 23 , the third piston 23 divides the air pressure chamber 152 again, and a suction chamber 154 is formed between the third piston 23 and the second piston 22 . The fifth one-way valve 35 is located between the suction chamber 154 and the output pipeline 12, so that the medium flows into the suction chamber 154 from the output pipeline 12 in one direction, and the sixth one-way valve 36 is also located between the suction chamber 154 and the output pipeline 12 During this period, the medium flows into the output pipe 12 from the suction chamber 154 in one direction.

At this time, when the first piston moves in the direction of increasing the volume of the medium chamber, the second check valve is closed due to the increase of the volume of the medium chamber and the decrease of air pressure, and at the same time, the third piston moves synchronously with the first piston to form a Move back, so that the volume of the suction chamber increases and the air pressure decreases, so that the fifth one-way valve is opened, so that the medium remaining in the output pipeline is sucked back into the suction chamber, and the overflow and air drying of the medium remaining in the output pipeline are avoided. clogged. Conversely, when the first piston moves again in the direction of reducing the volume of the medium chamber to output the medium in the medium chamber through the output pipe, the third piston moves synchronously with the first piston and forms a relative movement with the second piston, so that the suction The volume of the chamber decreases and the air pressure rises, opening the sixth one-way valve, so that the medium sucked back into the suction chamber is output to the output pipeline, and then output together with the medium in the medium chamber.

In addition, in this embodiment, the first one-way valve adopts a ball valve structure formed by a single steel ball, so that when the lotion pump is connected to the container, the first one-way valve can form an anti-inhalation pipeline by using its own gravity. When the air pressure in the medium chamber is reduced to the point where the air pressure in the container can push the first one-way valve to move, the medium can flow into the medium chamber through the suction pipe, thus forming the movement of the first one-way valve with the first piston. Automatic opening and closing action, thereby improving the operation convenience of the lotion pump.

At the same time, in this embodiment, the second one-way valve, the third one-way valve, the fourth one-way valve, the fifth one-way valve and the sixth one-way valve all adopt the ball valve structure formed by steel balls and springs, so that The opening and closing control of the corresponding one-way valve can be achieved by using the air pressure change formed by the corresponding piston moving relative to the pump body and the force of the spring in the corresponding one-way valve, which not only achieves the convenience of control operation, but also can use the spring to control the valve. The one-way valve remains in a normally closed state to ensure reliable and accurate action.

Of course, in other embodiments, depending on the design and operating conditions, check valves of other structural forms can also be used, such as electromagnetic check valves, which can be actively opened and closed by remote electronic control. Control, so as to achieve the effect of remote active control.

With reference to Fig. 1 to Fig. 3, the specific process of operating and using the lotion pump of this embodiment is as follows:

After the lotion pump and the container are threaded and installed, the first piston 21 moves to the direction of increasing the volume of the medium chamber 151 under the restoration force of the piston elastic member 6, and the first piston 21 drives the handle 4 through the first piston rod 51. Rotate, the handle 4 drives the second piston 22 to move towards the direction close to the medium chamber 151 through the second piston rod 52, so that the first piston 21 finally moves to the position where it contacts the second piston 22, as shown in Figure 1 , so that the handle 4 is in a natural equilibrium state, and at this time the auxiliary airway 221 and the air outlet 14 are kept disconnected.

When the handle 4 is pressed, the handle 4 takes the rotating shaft 41 as a fulcrum to drive the first piston rod 51 to move downwards, and drives the first piston 21 to overcome the force of the piston elastic member 6 to reduce the volume of the medium chamber 151. Moving, the volume of the medium chamber 151 decreases and the air pressure increases, the first one-way valve 31 is closed, and the second one-way valve 32 is opened, so that the medium in the medium chamber 151 is output through the output pipe 12 .

During this process, on the one hand, the handle 4 also uses the rotating shaft 41 as a fulcrum to drive the second piston rod 52 to move upwards, driving the second piston 22 to move away from the first piston 21, so that the auxiliary air channel 221 and the air outlet 14 Form communication, thereby the inner chamber of container is communicated with external atmosphere through air outlet 14, auxiliary air channel 221, air pressure cavity 152 and air inlet 13, thereby keep the balance relation of air pressure in container and external air pressure, on the other hand, the second The movement of the piston 22 to the direction away from the first piston 21 increases the volume of the liquid discharge chamber 153 and decreases the air pressure, while the air pressure in the air pressure chamber 152 maintains the atmospheric pressure, thereby opening the third check valve 33 and making the liquid in the air pressure chamber 152 It flows into the liquid discharge cavity 153 through the first liquid discharge channel 511 and the third one-way valve 33 . On the other hand, the third piston 23 moves downward synchronously with the first piston rod 51, so that the second piston 22 and the third piston 23 form a relative movement so that the volume of the suction chamber 154 decreases and the air pressure increases, while The air pressure in the output pipeline 12 is approximately equal to the external atmospheric pressure, so that the sixth one-way valve 36 is opened, so that the medium in the suction chamber 154 flows into the output pipeline 12 through the sixth one-way valve 36, and then together with the medium in the medium chamber 151 output.

When the handle 4 is pressed to the lowest point and the force on the handle 4 is released, the first piston 21 stops moving downward and starts to move upward under the restoration force of the piston elastic member 6, so that the volume of the medium chamber 151 increases and the pressure increases. When the first piston 21 moves to the air pressure in the medium chamber 151 and the air pressure in the container is reduced to the air pressure in the container, the first one-way valve 31 is opened, so that the medium in the container flows into the medium chamber through the suction pipe 11 and the first one-way valve 31 151, so that the medium can be output from the medium cavity 151 through the output pipe 12 again.

During this process, before the first piston 21 moves to form contact with the second piston 22 and the handle 4 is in a balanced position to stop moving, on the one hand, the movement of the first piston 21 is driven by the first piston rod 51 to carry out the handle 4 Reverse rotation, the handle 4 drives the second piston 22 to move towards the direction close to the first piston 21 through the second piston rod 52, and the auxiliary air channel 221 continues to maintain the communication relationship with the air outlet 14, thereby keeping the air pressure in the container at The state of external atmospheric pressure enables the medium in the container to enter the medium cavity 151 smoothly. On the other hand, the movement of the second piston 22 toward the direction close to the first piston 21 reduces the volume of the discharge chamber 153 and increases the air pressure until it rises to the point where the fourth one-way valve 34 is opened. The liquid in the cavity 153 is discharged to the outside of the pump body 1 through the second liquid discharge channel 512 and the fourth one-way valve 34 . On the other hand, the third piston 23 moves upwards synchronously with the first piston rod 51, so that the second piston 22 and the third piston 23 move backwards, the volume of the suction chamber 154 increases and the air pressure decreases, and the output pipe 12 is the external atmospheric pressure, so that the fifth one-way valve 35 is opened, so that the medium remaining in the output pipeline 12 flows into the suction chamber 154 through the fifth one-way valve 35, and the return of the residual medium in the output pipeline 12 is completed. suction handle.

Wherein, in this embodiment, by opening one end of the auxiliary air passage 221 that is selectively communicated with the air outlet 14 on the outer circumferential surface of the second piston 22 and setting it as an annular groove structure along the axial direction of the second piston 22, the It can ensure that during the reciprocating movement of the second piston 22 with the handle 4 relative to the pump body 1, the communication relationship between the auxiliary air channel 221 and the air outlet 14 is always maintained, and then the air pressure in the container is maintained in a state relative to the external atmospheric pressure. In order to ensure the normal output operation of the emulsion pump to the medium.

Claims (5)

1. A kind of lotion pump, it is characterized in that, comprises pump body, first piston, second piston, first one-way valve and second one-way valve; Described pump body is connected with container, and is provided with suction pipeline, output pipeline, air inlet and air outlet; the first piston is located inside the pump body, and divides the inside of the pump body to form a medium cavity and an air pressure cavity; one end of the suction pipeline communicates with the medium cavity , the other end extends to the inside of the container, one end of the output pipe communicates with the medium chamber, and the other end extends to the outside of the pump body; the first check valve is located between the suction pipe and the medium between the chambers, so that the medium can flow into the medium chamber in one direction; the second check valve is located between the output pipe and the medium chamber, so that the medium can flow into the output pipe in one direction; the air inlet will The air pressure chamber is in communication with the external air pressure, and the air outlet is in communication with the inside of the container; the second piston is located in the air pressure chamber, and an auxiliary air channel is provided on the second piston, and the auxiliary air channel One end communicates with the air pressure cavity, and the other end selectively communicates with the air outlet; wherein, when the first piston moves relative to the pump body, the second piston moves relative to the pump body to move the auxiliary The airway communicates with the air outlet; The second piston divides the air pressure chamber, forming a liquid discharge chamber between the first piston and the second piston, and the first piston is provided with a first liquid discharge channel and a second row Liquid passage; one end of the first liquid discharge passage communicates with the air pressure chamber, and the other end communicates with the liquid discharge chamber, and a third one-way valve is provided on the first liquid discharge passage to allow the liquid to flow from the The air pressure chamber flows into the liquid discharge chamber in one direction; one end of the second liquid discharge channel communicates with the liquid discharge chamber, and the other end communicates with the outside of the pump body, and the second liquid discharge channel is provided with There is a fourth one-way valve, so that the liquid flows out of the pump body in one direction from the discharge chamber; The lotion pump is also provided with a third piston, a fifth one-way valve and a sixth one-way valve; the third piston is fixedly connected with the first piston and is located in the air pressure chamber, and the second piston is located in the air pressure chamber. Between the first piston and the third piston, the third piston divides the air pressure chamber, forming a suction chamber between the third piston and the second piston; the fifth unit The one-way valve is located between the suction chamber and the output pipeline, so that the medium flows into the suction chamber from the output pipeline in one direction; the sixth one-way valve is located between the suction chamber and the output pipeline In between, the medium flows into the output pipeline from the suction chamber in one direction; when the first piston moves in the direction of reducing the volume of the medium chamber relative to the pump body, the second piston moves relative to the pump body. The pump body moves toward the direction close to the third piston; The lotion pump is also provided with a handle; the handle is located outside the pump body and is rotatably connected to the pump body; the first piston is rotatably connected to the handle through a first piston rod, and the second piston The second piston rod is rotationally connected with the handle, and the connection point between the first piston rod and the handle and the connection point between the second piston rod and the handle are located at the connection point between the handle and the pump body The lotion pump is also provided with a piston elastic member; the piston elastic member is located between the pump body and the first piston to drive the first piston to increase the pump body relative to the pump body. Move in the direction of the medium chamber volume. 2. The lotion pump according to claim 1, characterized in that, after the pump body is connected to the container, the position of the end of the auxiliary air channel that communicates with the air pressure chamber is higher than the air inlet The height of the location in communication with the outside air pressure. 3. The lotion pump according to claim 2, characterized in that, the third one-way valve and/or the fourth one-way valve are composed of steel balls and springs. 4. The lotion pump according to claim 3, characterized in that, the fifth one-way valve and/or the sixth one-way valve are composed of steel balls and springs. 5. The lotion pump according to any one of claims 1-4, characterized in that, the first one-way valve and/or the second one-way valve adopts a ball valve structure.

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