Vacuum pump and liquid distributor

Abstract

The invention relates to the field of pressing liquid outlet devices, in particular to a vacuum pump and a liquid distributor. The first piston can hermetically slide in the channel along a first linear direction; the piston rod is provided with a first flow channel, and the first flow channel comprises a liquid inlet and a liquid outlet which is always communicated with the upper pump cavity; the piston rod can move between an initial position and a final position under the action of force; the first piston has a first matching state and a second matching state; in the first matching state, the first piston seals the liquid inlet; in the second matching state, the liquid inlet is communicated with the lower pump cavity; when the piston rod moves from the initial position to the final position, the first piston can be pushed by the piston rod to move towards the first direction in a second matching form; when the piston rod is reset from the final position to the initial position, the first piston can be pushed by the piston rod to move towards a second direction in a first matching form; in the invention, the liquid pumping process is basically not influenced by the pressing force of a user.

Description

Technical Field

[0001] This application relates to the field of press-to-dispense liquid devices, and more particularly to a vacuum pump and a liquid dispenser. Background Technology

[0002] Currently, some liquids packaged in containers are typically dispensed using a press-type vacuum pump, such as some medicine bottles containing liquid medications (e.g., eye wash).

[0003] This type of vacuum pump, sometimes called a press pump, works on the following principle: when the user presses down on the press component of the vacuum pump, the vacuum pump pumps liquid out from the nozzle; after releasing the press component, the spring inside the vacuum pump pushes the press component upward to reset, and during the reset process, the press component draws liquid from the container to be pumped out the next time it is pressed.

[0004] This type of vacuum pump, which pumps liquid during the downward pressure process, still has shortcomings in its use. Specifically, the instantaneous speed and impact force of the liquid being pumped out directly depend on the speed and force of the user pressing down on the pressing component (usually, the greater the pressing speed and force, the greater the instantaneous speed and impact force of the liquid being pumped out). This results in the liquid being ejected at high speed if the downward pressure is too high, which can easily cause liquid splashing. Summary of the Invention

[0005] In order to solve at least one of the technical problems mentioned in the background art, the purpose of this application is to provide a vacuum pump and a liquid distributor.

[0006] To achieve the above objectives, this application provides the following technical solution.

[0007] On one hand, this application provides a vacuum pump, comprising: The pump body has a channel extending along a first straight line inside; A first piston is capable of sliding in a sealed manner along a first straight line in a channel; in the first straight line direction, the channel forms an upper pump chamber and a lower pump chamber on both sides of the first piston, the lower pump chamber being provided with a one-way liquid inlet end; the upper pump chamber being provided with a liquid outlet end; The piston rod has a first flow channel for connecting the upper pump chamber and the lower pump chamber. The first flow channel includes an inlet and an outlet that is always connected to the upper pump chamber. Relative to the pump body, the piston rod can be moved from an initial position to an end position in a first direction and can be reset from the end position to the initial position in a second direction. The first direction and the second direction are two opposite directions in the first straight line direction. An elastic component, which provides an elastic force to drive the piston rod back to its initial position; The first piston is movable relative to the piston rod along a first linear direction to produce a first engaged state and a second engaged state; in the first engaged state, the first piston closes the liquid inlet; in the second engaged state, the liquid inlet is exposed to communicate with the lower pump chamber; wherein: When the piston rod moves from the initial position to the final position, the first piston can move in the first direction in a second engagement configuration under the push of the piston rod; when the piston rod returns to the initial position from the final position, the first piston can move in the second direction in a first engagement configuration under the push of the piston rod.

[0008] As an optional embodiment of this application, along the second direction, the piston rod is provided with a first protrusion and a second protrusion that are radially protruding from the outer peripheral wall of the piston rod at intervals; the distance between the first protrusion and the second protrusion is greater than the axial length of the first piston; the first piston is slidably and sealingly disposed on the piston rod along the first straight direction, and its movement relative to the piston rod in the first straight direction is limited between the first protrusion and the second protrusion. In the first mating state, the bottom surface of the first piston in the first straight direction abuts against the first protrusion; In the second engagement state, the top surface of the first piston in the first straight direction abuts against the second protrusion.

[0009] As an optional embodiment of this application, the liquid inlet is located on the peripheral wall of the piston rod between the first protrusion and the second protrusion; in the second engagement state, a gap space is formed between the bottom surface of the first piston in the first straight direction and the first protrusion, and the liquid inlet is at least partially exposed in the gap space.

[0010] As an optional embodiment of this application, the upper pump chamber includes a stop surface that is relatively fixed to the pump body, and the liquid outlet is disposed on the peripheral wall of the piston rod; the piston rod is provided with a third protrusion that radially protrudes from the peripheral wall of the piston rod; in the first straight direction, the third protrusion is located between the second protrusion and the stop surface, and the liquid outlet is located between the second protrusion and the third protrusion; in the initial position, the third protrusion abuts against the stop surface.

[0011] As an optional implementation of this application, the first flow channel includes a flow guide cavity formed inside the piston rod; The piston rod has at least one inlet hole on its outer peripheral wall that communicates with the flow guide cavity to form the inlet of the first flow channel; and / or the piston rod has at least one outlet hole on its outer peripheral wall that communicates with the flow guide cavity to form the outlet of the first flow channel.

[0012] As an optional embodiment of this application, the elastic member includes a spring extending in a first linear direction, the spring being capable of applying an elastic force toward a second direction to the piston rod to drive the piston rod back to its initial position.

[0013] As an optional embodiment of this application, the pump body is provided with a guide portion, the piston rod is slidably and sealingly fitted on the guide portion along a first linear direction, and a pressing portion is provided at the end of the piston rod away from the lower pump chamber in the first direction.

[0014] As an optional embodiment of this application, the lower pump chamber includes an end wall located on the opposite side of the first piston in a first straight direction; The unidirectional liquid inlet end includes a liquid inlet through hole and a ball. The liquid inlet through hole is disposed on the end wall to connect the inner and outer spaces of the lower pump chamber. A floating space is provided on the side of the liquid inlet through hole facing the lower pump chamber. The ball is disposed in the floating space and can move along a first straight line direction within the floating space. In the initial state, the ball sits on the liquid inlet through hole under its own weight to close the liquid inlet through hole.

[0015] Alternatively, the unidirectional liquid inlet end includes a liquid inlet through hole and a flexible body. At least one liquid inlet through hole is provided on the end wall to connect the inner and outer spaces of the lower pump chamber. The flexible body includes a fixing part and a covering part. The fixing part is fixed on the end wall, and the covering part covers the inner side of the end wall and covers all liquid inlet through holes. The covering part can be flipped relative to the end wall to the side away from the end wall to open the liquid inlet through hole.

[0016] As an optional embodiment of this application, the liquid outlet is a one-way liquid outlet, which includes a second flow channel and a one-way valve. One end of the second flow channel is connected to the upper pump chamber, and the other end serves as an output end. The one-way valve is disposed in the second flow channel and is configured to allow liquid and air in the upper pump chamber to flow out unidirectionally through the second flow channel.

[0017] As an optional embodiment of this application, the vacuum pump includes a docking portion at its lower end in a first linear direction for engaging with a container, the docking portion having at least one air inlet and an air filter membrane for covering the air inlet.

[0018] On the other hand, this application also provides a liquid dispenser, including a container and the aforementioned vacuum pump; The container and / or pump body are provided with an air inlet, and the inside of the container and the external environment are connected through the air inlet; the air inlet is covered with an air filter membrane, and the one-way liquid inlet is connected to a conduit extending into the container; Alternatively, the container may include a peripheral wall and a second piston, which together form a cavity for the container, the cavity extending along a first linear direction; the second piston is capable of sliding in a sealing manner relative to the peripheral wall along the first linear direction.

[0019] As an optional embodiment of this application, the container further includes a base, which is disposed at the bottom of the peripheral sidewall in a first straight direction, and the base has one or more through holes penetrating the base in the first straight direction; the peripheral wall of the base has one or more through cuts.

[0020] Compared with the prior art, this application has the following advantages: In the vacuum pump provided in this application, liquid is dispensed or pumped during the upward reset process of the piston rod and the first piston. The reset force of the first piston and the piston rod is provided by an elastic component and is not affected by the force and speed at which the user presses the piston rod. Thus, when the vacuum pump is pumping liquid, the speed and impact force of the liquid pumped out are basically unaffected by the force and speed at which the user presses the piston rod. This avoids the problem of liquid splashing caused by high-speed liquid ejection due to excessive downward pressure, which exists in the prior art. Furthermore, the liquid dispensing process is more stable.

[0021] In addition, the liquid outlet in this application is located on the pump body, so its position will not change with the pressing action of the piston rod when pumping, thereby preventing the problem of liquid splashing caused by the movement of the liquid outlet position.

[0022] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0023] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0024] Figure 1 A schematic diagram of the structure of Embodiment 1 of this application is shown; Figure 2 A cross-sectional view of Embodiment 1 of this application is shown; Figure 3 A cross-sectional view of the unidirectional liquid inlet end of the flexible body used in Embodiment 1 of this application is shown; Figure 4This diagram shows the structure of the piston rod in its initial position according to Embodiment 1 of this application; Figure 5 This paper shows a schematic diagram of the state structure of the piston rod during the downward pressing process in Embodiment 1 of this application; Figure 6 This diagram shows a schematic of the piston rod in the end position state according to Embodiment 1 of this application; Figure 7 This paper shows a schematic diagram of the structure during the upward movement of the piston rod in Embodiment 1 of this application; Figure 8 It shows Figure 2 Enlarged view of section A in the middle; Figure 9 A schematic diagram of the structure of Embodiment 2 of this application is shown; Figure 10 A cross-sectional view of Embodiment 2 of this application is shown; Figure 11 A schematic diagram of the structure of Embodiment 3 of this application is shown; Figure 12 A cross-sectional view of Embodiment 3 of this application is shown; Figure 13 A partial cross-sectional view of Embodiment 3 of this application is shown.

[0025] Explanation of the labels in the diagram: X, first linear direction; X1, first direction; X2, second direction; M, vacuum pump; 1. Pump body; 11. Lower pump chamber; 111. End wall; 12. Upper pump chamber; 13. Guide section; 131. Stop surface; 14. Connecting plate; 141. Air inlet; 142. Air filter membrane; 2. One-way liquid inlet end; 21. Liquid inlet through hole; 22. Sphere; 23. Protrusion; 24. Flexible body; 241. Covering part; 242. Fixing part; 25. Guide tube; 3. Liquid outlet end; 31. Liquid outlet through hole; 32. Liquid outlet pipe; 33. One-way valve; 330. Spray hole; 331. Valve body; 332. Valve passage; 333. Connecting part; 3331. Hole; 34. Valve core; 341. Sealing part; 3410. Deformation groove; 4. First piston; 5. Piston rod; 51. Flow guide cavity; 52. Liquid inlet; 53. Liquid outlet; 54. First protrusion; 55. Second protrusion; 56. Third protrusion; 57. Pressing part; 58. Spring; 6. Bottle body; 60. Cavity; 61. Peripheral sidewall; 62. Second piston; 7. Base; 71. Through hole; 72. Cut. Detailed Implementation

[0026] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] To address the issues in existing push-type vacuum pumps where the pumping speed and impact force of the liquid are affected by the user's pressing force and speed, and where the liquid outlet changes position during the pressing action, leading to liquid splashing, this application provides a vacuum pump whose liquid outlet is not affected by the pressing force and speed, and whose liquid outlet position does not change during pressing.

[0028] To better understand this application, this application uses a vacuum pump for dispensing eyewash solution as an example to explain the above-mentioned technical problems in detail: In existing press-dispensing eyewash bottles, a press-type vacuum pump is usually installed on the bottle (or bottle body). The vacuum pump has a nozzle (i.e., the dispensing end). The general operation to dispense the eyewash from the bottle is to place the bottle on a table and place a receiving cup on the table corresponding to the nozzle position. Then, press the pressing part (i.e., the pressure head) of the vacuum pump up and down, and the eyewash from the bottle will be sprayed from the nozzle into the receiving cup, thus dispensing the solution.

[0029] In the prior art, such vacuum pumps typically employ a "press-to-dispense" mode. That is, when the pressure head of the vacuum pump is pressed down, the liquid in the bottle is pumped out from the nozzle; after the pressure head is released, as it returns to its original position under the action of the spring, the vacuum pump draws the liquid in the container into the pump chamber for the next press.

[0030] In this "press to dispense liquid" mode, the instantaneous speed and impact force of the liquid pumped out largely depend on the speed and force of pressing down the pump head. If the pressure is too high, the liquid will be ejected at high speed, which can easily cause liquid splashing. Here, splashing can be understood as the liquid deviating from the receiving cup or splashing out of the receiving cup due to excessive impact force and speed when pumped out.

[0031] Moreover, the dispensing in this mode is not stable enough. Specifically, because the dispensing is affected by the pressure and speed of the press, if the pressure and speed are not controlled properly during multiple presses, the dispensing speed will fluctuate, which is the aforementioned unstable dispensing.

[0032] Based on this, this application provides a vacuum pump, comprising: The pump body has a channel extending along a first straight line inside; A first piston is capable of sliding in a sealed manner along a first straight line in a channel; in the first straight line, the channel forms an upper pump chamber and a lower pump chamber located below the upper pump chamber on both sides of the first piston, the lower pump chamber being provided with a one-way liquid inlet end; the upper pump chamber being provided with a liquid outlet end; The piston rod has a first flow channel for connecting the upper pump chamber and the lower pump chamber. The first flow channel includes an inlet and an outlet that is always connected to the upper pump chamber. Relative to the pump body, the piston rod can be moved from an initial position to an end position in a first direction and can be reset from the end position to the initial position in a second direction. The first direction and the second direction are two opposite directions in the first straight line direction. An elastic component, which provides an elastic force to drive the piston rod back to its initial position; The first piston is movable relative to the piston rod along a first linear direction to produce a first engaged state and a second engaged state; in the first engaged state, the first piston closes the liquid inlet; in the second engaged state, the liquid inlet is exposed to communicate with the lower pump chamber; wherein: When the piston rod moves from the initial position to the final position, the first piston can move in the first direction in a second engagement configuration under the push of the piston rod; when the piston rod returns to the initial position from the final position, the first piston can move in the second direction in a first engagement configuration under the push of the piston rod.

[0033] For ease of understanding, the following uses eyewash as an example to illustrate specific embodiments of this application. In this case, the container is a bottle and the liquid is eyewash.

[0034] Example 1 like Figure 1 and Figure 2 A vacuum pump is shown, as indicated by part M in the figure; the vacuum pump mainly includes components such as pump body 1, first piston 4, and piston rod 5.

[0035] Figure 1 The diagram shows the structure of this embodiment. The pump body 1 is generally cylindrical, and one end of it has a docking part 14 for docking with the bottle body 6. The bottle body 6 is used to hold eyewash solution. One end of the bottle body 6 forms a bottle mouth. The pump body 1 can be installed on the bottle mouth based on the docking part 14, for example, by threaded connection or snap-fit ​​connection.

[0036] For ease of explanation, in this embodiment, the axial direction of the pump body 1 is denoted as the first straight direction X. In the upright state of this embodiment, the first straight direction X can be understood as vertical, i.e., up and down. To further distinguish, the direction downward (i.e., vertically downward) of the first straight direction X is denoted as the first direction X1, and the direction upward (i.e., vertically upward) of the first straight direction X is denoted as the second direction X2; at this time, the first direction X1 and the second direction X2 are equivalent to two opposite directions on the first straight direction X.

[0037] Figure 2 The internal structure of this embodiment is shown, as follows: Figure 2 As shown, the pump body 1 has a channel extending along the first straight direction X. In some embodiments, the channel is a cylindrical channel, that is, the cross-section of the channel is circular; the upper and lower ends of the channel are closed.

[0038] The first piston 4 is disposed in the channel and can slide in the channel in a sealed manner along the first straight direction X. Here, the sealed sliding means that the first piston 4 can slide up and down relative to the pump body 1 in the channel, and the sealing of the relative sliding contact between the two can be guaranteed. For example, in this embodiment, the outer peripheral wall of the piston can slide up and down against the peripheral wall of the channel.

[0039] With the first piston 4 separating the two pump chambers, the channel forms an upper pump chamber 12 on the upper side of the first piston 4 and a lower pump chamber 11 on the lower side of the first piston 4. That is, the channel is divided into two pump chambers by the first piston 4, with the first piston 4 acting as both the bottom wall of the upper pump chamber 12 and the top wall of the lower pump chamber 11. At this time, the two pump chambers are essentially two floating chambers with variable volumes, which can change their volume according to the sliding of the first piston 4. Specifically, when the first piston 4 moves upward, the space of the upper pump chamber 12 decreases and the space of the lower pump chamber 11 increases; conversely, when the first piston 4 moves downward, the space of the upper pump chamber 12 increases and the space of the lower pump chamber 11 decreases.

[0040] The lower pump chamber 11 is provided with a liquid inlet side and the upper pump chamber 12 is provided with a liquid outlet 3. The liquid inlet side refers to the input part where the liquid enters the vacuum pump, and the liquid outlet 3 refers to the part where the vacuum pump outputs the liquid; that is, the liquid in the bottle 6 enters the vacuum pump through the liquid inlet side and is finally pumped out through the liquid outlet 3.

[0041] In this embodiment, the liquid inlet side is located at the bottom of the lower pump chamber 11, and it is a one-way liquid inlet end 2. Here, the one-way liquid inlet end 2 means that the liquid inlet side can only enter in one direction, and it is blocked in the opposite direction. That is, the one-way liquid inlet end 2 allows the liquid in the bottle 6 to enter the pump chamber through the liquid inlet side, and conversely, the liquid in the pump chamber cannot flow back into the bottle 6 through the liquid inlet side.

[0042] like Figure 2As shown, a specific structure of a one-way liquid inlet end 2 is provided. The one-way liquid inlet end 2 includes a liquid inlet through hole 21 and a ball 22. The liquid inlet through hole 21 is opened on the bottom wall of the lower pump chamber 11. Here, the bottom wall refers to the wall of the lower pump chamber 11 on the opposite side of the first piston 4 in the first straight direction X, which is referred to as the end wall 111 below. That is, the liquid inlet through hole 21 is opened on the end wall 111 and vertically penetrates the end wall 111 to connect the inner and outer spaces of the lower pump chamber 11.

[0043] In addition, a floating space is formed at the upper end of the liquid inlet hole 21 within the lower pump chamber 11. The ball 22 is disposed within the floating space and can move at least within the floating space along the first straight direction X. The floating space constrains the ball 22 to move in a specific position and direction.

[0044] like Figure 2 As shown, the floating space is specifically formed by providing a plurality of protrusions 23 arranged sequentially and spaced apart along the circumference of the liquid inlet hole 21 on the top wall of the end wall 111. The side wall of the protrusions 23 facing the liquid inlet hole 21 is recessed outward to form an arc-shaped recessed area, and the recessed areas together form the floating space.

[0045] In the initial state, when the sphere 22 is not subjected to external forces, under its own weight and the constraint of the floating space, the sphere 22 sits on the upper end of the liquid inlet hole 21, thus sealing the liquid inlet hole 21. In this way, when the liquid flows upward from the liquid inlet hole 21, the liquid pushes the sphere 22 upward a certain distance, so that the liquid inlet hole 21 is at least partially exposed to allow the liquid to enter the lower pump chamber 11. Conversely, the liquid in the lower pump chamber 11 cannot flow out of the lower pump chamber 11 through the liquid inlet hole 21 due to the blockage of the sphere 22, thus achieving the purpose of unidirectional liquid inlet.

[0046] In some other alternative embodiments, in addition to the above-described method of using a ball 22 in conjunction with an inlet hole 21, the one-way inlet end 2 can also adopt, as shown in the following... Figure 3 The one-way liquid inlet end 2 shown is mainly composed of a liquid inlet through hole 21 and a flexible body 24. The flexible body 24 refers to a component with a certain degree of flexibility, such as a flexible body 24 made of silicone or rubber, which is basically in the shape of a disc in some embodiments.

[0047] At least one liquid inlet hole 21 is provided, preferably multiple liquid inlet holes 21 are provided, and the multiple liquid inlet holes 21 are evenly distributed around the end wall 111 in the circumference, and the liquid inlet holes 21 penetrate the end wall 111 to connect the inner and outer spaces of the end wall 111; the flexible body 24 includes a fixing part 242 and a covering part 241, preferably the flexible body 24 is an integral structure; wherein, the fixing part 242 is fixed to the end wall 111, and the covering part 241 covers the inner surface of the end wall 111 and covers all the liquid inlet holes 21; wherein, the covering part 241 is essentially fixed to the end wall 111 by the fixing part 242. On the 1, the portion surrounding the fixing part 242 can be flipped away from the end wall 111 to open the liquid inlet hole 21. Specifically, in the initial state, the covering part 241 adheres to and covers the liquid inlet hole 21 under its own elasticity and stress, so that the liquid in the lower pump chamber 11 cannot flow back out through the liquid inlet hole 21. When the liquid flows upward from the liquid inlet hole 21, the liquid will push the covering part 241 upward, so that the covering part 241 releases the covering of the liquid inlet hole 21, allowing the liquid to enter the lower pump chamber 11 through the liquid inlet hole 21, thus achieving the purpose of unidirectional liquid inlet.

[0048] like Figure 2 As shown, the piston rod 5 is mainly used to push the first piston 4 to move along the first straight direction X to realize the pumping action. The piston rod 5 is basically coaxial with the pump body 1. It can move from the initial position to the end position along the first direction X1 (i.e. downward); it can also be reset from the end position to the initial position along the second direction X2 (upward).

[0049] In this embodiment, the force for the piston rod 5 to return from its endpoint position to its initial position is mainly provided by an elastic member. For example, in some embodiments... Figure 4 As shown, the elastic component mainly includes a spring 58, which extends along the first linear direction X and can apply an elastic force to the piston rod 5 in the second direction X2 (upward) to drive the piston rod 5 back to the initial position.

[0050] A pressing part 57 is formed at the upper end of the piston rod 5, which is similar to a pressure cap. The pressing part 57 can be an integral part of the piston rod 5, or it can be an independent part that is fixed to the upper end of the piston rod 5. In this case, the pressing part 57 is equivalent to a force-bearing part, and the person presses the pressing part 57 to drive the piston rod 5 to press down.

[0051] In some embodiments, in order to guide the piston rod 5 to slide vertically, a guide portion 13 is fixed inside the pump body 1, and the piston rod 5 slides vertically and is sealed through the guide portion 13.

[0052] In some embodiments, a spring 58 is sleeved on the piston rod 5, with its upper end abutting against the pressing part 57 and its lower end abutting against the guide part 13. The spring 58 pushes the piston rod 5 upward to reset. Of course, in some other optional embodiments (not shown in the figure), the spring 58 can also be disposed in the lower pump chamber 11, with its upper end abutting against the lower end of the piston rod 5 or the lower wall of the first protrusion 54, and its lower end abutting against the bottom wall of the lower pump chamber 11. In this way, an upward elastic force can also be generated on the piston rod 5 to drive the piston rod 5 to reset.

[0053] A first flow channel is provided in the piston rod 5, such as Figure 2 A specific structure of the first flow channel is shown. The first flow channel includes a guide cavity 51, an inlet hole 52, and an outlet hole 53. The guide cavity 51 is located inside the piston rod 5 and has a closed structure. The inlet hole 52 and the outlet hole 53 are both located on the peripheral wall of the piston rod 5 and are both connected to the guide cavity 51. The inlet hole 52 is located below the outlet hole 53. At this time, the inlet hole 52, the guide cavity 51, and the outlet hole 53 together constitute the first flow channel. The inlet hole 52 is equivalent to the inlet of the first flow channel, and the outlet hole 53 is equivalent to the outlet of the first flow channel. The outlet hole 53 is always connected to the upper pump chamber 12, so that the liquid in the lower pump chamber 11 can enter the upper pump chamber 12 in sequence through the inlet hole 52, the guide cavity 51, and the outlet hole 53.

[0054] In this embodiment, the piston rod 5 is coaxially and movably mounted on the first piston 4, so that the first piston 4 can move relative to the piston rod 5 along the first straight direction X. It is worth noting that the piston rod 5 and the first piston 4 are in a sliding seal fit, that is, the two can slide relative to each other while ensuring the seal at the sliding contact point.

[0055] The first piston 4 can switch between a first engagement state and a second engagement state by moving relative to the piston rod 5 in the first linear direction X.

[0056] In the first cooperative state, such as Figure 4 As shown, the first piston 4 closes the liquid inlet hole 52; in the second mating state, as... Figure 5 As shown, the first piston 4 releases the seal on the inlet hole 52, so that the outlet hole 53 is at least partially exposed to communicate with the lower pump chamber 11.

[0057] like Figure 2As shown, along the second direction X2, the piston rod 5 is provided with a first protrusion 54, a second protrusion 55, and a third protrusion 56 that are radially protruding from the outer peripheral wall of the piston rod 5. The distance between the first protrusion 54 and the second protrusion 55 is greater than the axial length of the first piston 4. Here, the axial length of the first piston 4 can be understood as the distance between the upper and lower end faces of the first piston 4. The first piston 4 passes through the rod segment of the piston rod 5 located between the first protrusion 54 and the second protrusion 55. The sliding stroke of the first piston 4 relative to the piston rod 5 is limited by the first protrusion 54 and the second protrusion 55, that is, the first piston 4 can only slide relative to the piston rod 5 between the first protrusion 54 and the second protrusion 55.

[0058] Figure 4 and Figure 7 A schematic diagram of the structure of the first piston 4 in the first engagement state is shown. In the first engagement state, the lower end face of the first piston 4 abuts against the upper end face of the first protrusion 54, there is a gap between the upper end face of the first piston 4 and the second protrusion 55, and the first piston 4 covers the liquid inlet hole 52. In this state, when the piston rod 5 moves along the second direction X2 (upward), the first piston 4 and the piston rod 5 can move upward synchronously under the push of the second protrusion 55.

[0059] Figure 5 and Figure 6 A schematic diagram of the first piston 4 in a second engagement state is shown. In the second engagement state, the upper end face of the first piston 4 abuts against the bottom surface of the second protrusion 55, and there is a gap between the lower end face of the first piston 4 and the upper end face of the first protrusion 54. The liquid inlet 52 is exposed in the gap, so that the liquid inlet 52 communicates with the lower pump chamber 11. In this state, when the piston rod 5 moves along the first direction X1 (downward), the first piston 4 and the piston rod 5 can move downward synchronously under the push of the second protrusion 55.

[0060] In this embodiment, Figures 4-7 The sequence of actions shown is from pressing to releasing the hand. Specifically: Figure 4 The diagram shows the structure in its initial state, that is, the state in which the pressing part 57 and the piston rod 5 are not pressed with force. At this time, the piston rod 5 is in the initial position and the first piston 4 is in the first engagement state.

[0061] When the pressing part 57 is pressed, causing the piston rod 5 to move downward, the piston rod 5 will move downward relative to the first piston 4 until the second protrusion 55 abuts against the upper end face of the first piston 4; because the resistance between the first piston 4 and the pump body 1 is greater than the resistance between the piston rod 5 and the first piston 4, the first piston 4 remains essentially stationary relative to the pump body 1 during this process; at this point, it enters... Figure 5As shown in the diagram, the first piston 4 is in the second engagement state, and the liquid inlet 52 is exposed. When by Figure 5 When the pressing part 57 is pressed down further in the state shown, the piston rod 5 will push the first piston 4 to move down synchronously until it reaches the end position, that is... Figure 6 As shown in the diagram. During this process, since the inlet hole 52 is exposed, as the first piston 4 moves downward, the space of the lower pump chamber 11 is gradually compressed, causing the liquid in the lower pump chamber 11 to be squeezed and sequentially enter the upper pump chamber 12 through the inlet hole 52, the guide chamber 51, and the outlet hole 53.

[0062] Upon arrival Figure 6 After reaching the indicated state, release the pressing part 57. Under the elastic force of the spring 58, the piston rod 5 will move upward until the first protrusion 54 contacts the first piston 4. At this point, it is in the indicated state. Figure 7 As shown in the diagram, the first piston 4 is in the second engagement state, and the liquid inlet 52 is closed.

[0063] Finally, based on Figure 7 As shown, piston rod 5 continues to return to its initial position by moving upwards. Figure 4 (as shown in the position) During this process, the piston rod 5 will push the first piston 4 to move upward together. At this time, the space of the lower pump chamber 11 gradually expands and the air pressure decreases, thereby continuously drawing the liquid in the bottle 6 into the lower pump chamber 11 through the one-way liquid inlet 2. At the same time, the space in the upper pump chamber 12 gradually decreases, and the liquid in the upper pump chamber 12 is squeezed out through the liquid outlet 3 by the first piston 4 to achieve pumping.

[0064] Based on the above process, it can be seen that the final pumping process takes place during the upward reset of piston rod 5, and the force for the upward reset of piston rod 5 is provided by spring 58, which is not affected by the force of human pressing; thus, the final pumping process is stable and is not affected by the force of human pressing.

[0065] In short, in this application, the pressing process is equivalent to an energy storage process, which stores energy in the spring 58. After releasing the pressure, the spring 58 releases energy, pushing the piston rod 5 and the first piston 4 upward to pump out the liquid.

[0066] Furthermore, in this application, the liquid outlet 3 is located on the pump body 1 and is basically independent of the piston rod 5. That is, when the piston rod 5 is pressed, the position of the liquid outlet 3 relative to the pump body 1 will not change significantly.

[0067] In this embodiment, as Figure 4As shown, there is a gap between the second protrusion 55 and the third protrusion 56, and the liquid outlet 53 is disposed between the second protrusion 55 and the third protrusion 56; the pump body 1 is provided with a stop surface 131, for example, the bottom of the guide portion 13 serves as the stop surface 131, and the stop surface 131 is used to limit the third protrusion 56. In the initial position, under the elastic force of the spring 58, the third protrusion 56 abuts against the stop surface 131 to maintain the initial position; the second protrusion 55 can prevent the first piston 4 from passing over the second protrusion 55 and covering the liquid outlet 53, so that the liquid outlet 53 can always be connected to the upper pump chamber 12.

[0068] In some embodiments, such as Figure 2 The diagram shows the structure of a liquid outlet 3, which mainly includes a second flow channel. One end of the second flow channel is located at the upper pump chamber 12 and communicates with the upper pump chamber 12, while the other end serves as the output end for outputting liquid.

[0069] like Figure 2 A specific structure of a second flow channel is provided. The second flow channel includes a liquid outlet through hole 31 opened on the peripheral wall of the upper pump chamber 12 and a liquid outlet pipe 32 fixed on the pump body 1 and connected at one end to the liquid outlet through hole 31. The internal pipeline of the liquid outlet pipe 32 and the liquid outlet through hole 31 together constitute the second flow channel.

[0070] Furthermore, in some embodiments, the liquid outlet 3 is preferably a one-way liquid outlet 3, so as to play a role in preventing bacteria, and bacteria and other impurities in the outside air flow back into the pump chamber through the second flow channel.

[0071] like Figure 8 The diagram shows the construction of a one-way liquid outlet 3, which also includes a one-way valve 33 located at the output end of the second flow channel. The one-way valve 33 is configured to allow liquid and air in the upper pump chamber 12 to flow out of the second flow channel in one direction, and to stop it in the opposite direction.

[0072] The one-way valve 33 includes a valve body 331 and a valve core 34. The valve body 331 has a hollow structure and has a valve channel 332 inside that allows liquid to flow. The valve body 331 is fixed to the output end of the liquid outlet pipe 32, so that the valve channel 332 and the liquid outlet pipe 32 are connected.

[0073] The valve channel 332 is open at one end near the outlet pipe 32 to form an inlet, and the valve channel 332 away from the outlet pipe 32 forms a spray hole 330, from which the liquid is finally sprayed out.

[0074] The valve core 34 is fixed on the valve body 331. A connecting plate 333 is provided inside the valve body 331. One end of the valve core 34 is fixed on the connecting plate 333, and the other end extends toward the spray hole 330. Several holes 3331 are formed on the periphery of the connecting plate 333, penetrating the upper and lower sides of the connecting plate 333. Liquid can pass through the connecting plate 333 through the holes 3331.

[0075] The end of the valve core 34 furthest from the connecting plate 333 forms a sealing portion 341. The sealing portion 341 is located between the liquid inlet and the spray hole 330 of the valve passage 332. The sealing portion 341 is a radially deformable component; in some embodiments, it may be made of an elastically deformable material. Furthermore, the entire valve core 34 is a single-piece structure. Here, "radial" can be understood as the radial direction of the valve passage 332 or the radial direction of the sealing portion 341 itself.

[0076] In some embodiments, the sealing portion 341 has a circumferential structure, and the sealing portion 341 and the valve passage 332 are substantially coaxially arranged.

[0077] The sealing part 341 can be radially deformed to produce a first state and a second state. In the first state, the outer peripheral wall of the sealing part 341 abuts against the inner peripheral wall of the valve passage 332 along the circumference of the valve passage 332. At this time, it is equivalent to sealing the valve passage 332 by the sealing part 341, that is, closing the valve passage 332. In the second state, a gap is formed between the outer peripheral wall of the sealing part 341 and the inner peripheral wall of the valve passage 332. This gap position allows liquid to flow, thus opening the valve passage 332.

[0078] Furthermore, the sealing part 341 is specifically configured such that an annular deformation groove 3410 is provided at the end of the valve core 34, and the part of the valve core 34 that surrounds the deformation groove 3410 constitutes the sealing part 341. The existence of the deformation groove 3410 is mainly to allow the sealing part 341 to have space for radial deformation.

[0079] The principle of achieving unidirectional liquid discharge is as follows: In the initial state, the sealing part 341 is in the first state to close the valve passage 332, so that outside air cannot enter the upper pump chamber 12 through the valve passage 332; when the liquid flows outward from the valve passage 332, the sealing part 341 will deform radially inward under the push of the liquid to switch to the second state, so that the liquid can flow out normally.

[0080] The vacuum pump provided in this embodiment is installed on the bottle body 6 for use. During the pumping process, as the liquid in the bottle body 6 is extracted, the air pressure inside the bottle body 6 will decrease. If air is not replenished into the bottle in time to balance the internal and external air pressure, it will affect the subsequent pumping. Based on this, in some embodiments, at least one air inlet 141 is provided on the docking part 14. When the vacuum pump is installed on the bottle body 6 through the docking part 14, the internal and external spaces of the bottle can be connected through the air inlet 141. The air inlet 141 is covered with an air filter membrane 142. The air filter membrane 142 mainly plays the role of air filtration, preventing bacteria and other impurities in the air from entering the bottle body 6 when the air is introduced. In addition, this type of air filter membrane 142 also has a certain water-resistant performance, that is, the liquid cannot pass through the air filter membrane 142. There are many descriptions of this filter membrane in the prior art, and it will not be elaborated on here.

[0081] Example 2 This embodiment is based on embodiment 1, such as... Figure 9 and Figure 10 As shown, a liquid dispenser is provided, which mainly includes a container and a vacuum pump M provided in Example 1. Taking eye wash solution as an example, the bottle 6 that holds the eye wash solution is the container.

[0082] The vacuum pump is installed onto the opening of the container via the docking part 14.

[0083] In this embodiment, the vacuum pump is the same as the one in embodiment 1, which has an air inlet 141 and an air filter membrane 142. Air intake is achieved through the air inlet 141. In addition, a conduit 25 extending into the bottle body 6 is provided at the one-way liquid inlet end 2. When pumping liquid, the liquid in the bottle body 6 enters the lower pump chamber 11 through the conduit 25-one-way liquid inlet end 2.

[0084] In addition, the air inlet 141 and the air filter membrane 142 can be installed on the vacuum pump or directly on the bottle body 6. For example, an area for opening the air inlet 141 can be marked out on the bottle body 6, and the air filter membrane 142 can be covered on the area.

[0085] Example 3 This embodiment is based on embodiment 1, such as... Figures 11-13 As shown, another liquid dispenser (hereinafter referred to as dispenser) is provided. The dispenser provided in this embodiment mainly includes a container and a vacuum pump M provided in embodiment 1. The container is mainly used to hold the liquid to be dispensed. Taking eye wash as an example, the container can be understood as a bottle 6 that holds eye wash. The upper end of the bottle 6 forms a bottle mouth, and the docking part 14 of the vacuum pump is installed at the bottle mouth.

[0086] The difference between this embodiment and Embodiment 2 is that in Embodiment 2, the connecting part 14 with an air inlet 141 and an air filter membrane 142 is used as the air intake part of the bottle body 6, while in this embodiment, the air inlet 141 and the air filter membrane 142 are not provided, that is, the connecting part 14 is basically a closed structure. Furthermore, the conduit 25 is not provided in this embodiment.

[0087] In order to maintain the air pressure inside the bottle 6, this embodiment makes improvements to the structure of the container (bottle 6), specifically, as follows: Figure 12As shown, the bottle body 6 includes a second piston 62 and a hollow cylindrical peripheral wall 61. The second piston 62 and the peripheral wall 61 together form a cavity 60 for holding liquid in the bottle body 6. The peripheral wall 61 is made of a rigid material. The cavity 60 extends along a first straight direction X. At this time, the peripheral wall 61 is equivalent to the peripheral wall of the cavity 60, and the second piston 62 is equivalent to the bottom wall of the cavity 60. In addition, the second piston 62 can slide in a sealed manner relative to the peripheral wall 61 along the first straight direction X. The term "sliding in a sealed manner" is explained in Embodiment 1 and will not be repeated here. It can be understood that the second piston 62 can slide up and down against the inner wall of the peripheral wall 61.

[0088] This configuration is equivalent to forming a variable-volume cavity 60 inside the bottle 6. Specifically, as the vacuum pump extracts the liquid from the cavity 60, the pressure inside the cavity 60 decreases, creating a pressure difference with the external air pressure. Under the action of this pressure difference, the second piston 62 will be pushed upward to balance the pressure inside the cavity 60 and ensure normal liquid discharge.

[0089] In addition, compared with the pressure balancing method in Embodiment 2, this method has another advantage: it does not require the installation of a conduit 25 in the cavity 60. With the lifting of the second piston 62, the liquid level in the cavity 60 can be maintained at the one-way inlet position, ensuring that the one-way inlet can normally draw liquid from the cavity 60.

[0090] In addition, since the second piston 62 is located at the bottom of the bottle body 6, and the bottle body 6 is generally placed on a table for dispensing liquid, in order to ensure that the external air pressure can act normally on the bottom of the second piston 62, in some embodiments, the bottle body 6 also includes a base 7, which is fixed to the bottom of the peripheral sidewall 61 in the first direction X1, and is used to support the entire dispenser.

[0091] In addition, the base 7 is provided with one or more through holes 71 penetrating the base 7 in the first direction X1; the peripheral wall of the base 7 has one or more through cuts 72, so that outside air can act on the bottom of the second piston 62 in sequence through the cuts 72-through holes 71 to push the second piston 62 to move upward.

[0092] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0094] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. Vacuum pump, characterized in that include: The pump body has a channel extending along a first straight line inside; The first piston is capable of sliding in a sealed manner along a first linear direction within the channel; In the first straight direction, the channel forms an upper pump chamber and a lower pump chamber on both sides of the first piston, the lower pump chamber is provided with a one-way liquid inlet end; the upper pump chamber is provided with a liquid outlet end. The piston rod has a first flow channel for connecting the upper pump chamber and the lower pump chamber. The first flow channel includes an inlet and an outlet that is always connected to the upper pump chamber. Relative to the pump body, the piston rod can be moved from an initial position to an end position in a first direction and can be reset from the end position to the initial position in a second direction. The first direction and the second direction are two opposite directions in the first straight line direction. An elastic component, which provides an elastic force to drive the piston rod back to its initial position; The first piston is movable relative to the piston rod along a first straight line to generate a first engagement state and a second engagement state; in the first engagement state, the first piston closes the liquid inlet. In the second engagement state, the inlet is exposed to communicate with the lower pump chamber; wherein: When the piston rod moves from the initial position to the final position, the first piston can move in the first direction in a second engagement configuration under the push of the piston rod; when the piston rod returns to the initial position from the final position, the first piston can move in the second direction in a first engagement configuration under the push of the piston rod.

2. Vacuum pump according to claim 1, characterized in that Along the second direction, the piston rod is provided with a first protrusion and a second protrusion that are radially protruding from the outer peripheral wall of the piston rod at intervals; the distance between the first protrusion and the second protrusion is greater than the axial length of the first piston; the first piston is slidably and sealingly disposed on the piston rod along the first straight direction, and its movement relative to the piston rod in the first straight direction is limited between the first protrusion and the second protrusion. In the first mating state, the bottom surface of the first piston in the first straight direction abuts against the first protrusion; In the second engagement state, the top surface of the first piston in the first straight direction abuts against the second protrusion.

3. Vacuum pump according to claim 2, characterized in that The liquid inlet is located on the peripheral wall of the piston rod between the first protrusion and the second protrusion; in the second engagement state, a gap space is formed between the bottom surface of the first piston in the first straight direction and the first protrusion, and the liquid inlet is at least partially exposed in the gap space.

4. Vacuum pump according to claim 2, characterized in that The upper pump chamber includes a stop surface that is relatively fixed to the pump body, and the liquid outlet is located on the peripheral wall of the piston rod; the piston rod is provided with a third protrusion that radially protrudes from the peripheral wall of the piston rod; in the first straight direction, the third protrusion is located between the second protrusion and the stop surface, and the liquid outlet is located between the second protrusion and the third protrusion; in the initial position, the third protrusion abuts against the stop surface.

5. The vacuum pump of claim 1, wherein, The first flow channel includes a flow guide cavity formed inside the piston rod; The piston rod has at least one inlet hole on its outer peripheral wall that communicates with the flow guide cavity to form the inlet of the first flow channel; and / or the piston rod has at least one outlet hole on its outer peripheral wall that communicates with the flow guide cavity to form the outlet of the first flow channel.

6. Vacuum pump according to claim 5, characterized in that The elastic member comprises a spring extending along the first linear direction, which can apply an elastic force to the piston rod in the second direction to drive the piston rod to return to the initial position.

7. The vacuum pump of claim 1, wherein, The pump body is provided with a guide portion, and the piston rod is sealingly and slidably fitted on the guide portion in the first linear direction. An end of the piston rod away from the lower pump cavity in the first direction is provided with a pressing portion.

8. The vacuum pump of claim 1, wherein, The lower pump cavity comprises end walls on opposite sides of the first piston in the first linear direction. The one-way liquid inlet end comprises a liquid inlet through hole and a ball. The liquid inlet through hole is provided on the end wall to communicate the space inside and outside the lower pump cavity. The liquid inlet through hole is provided with a floating space on the side facing the lower pump cavity. The ball is arranged in the floating space and can at least move in the first linear direction in the floating space. In the initial state, the ball is seated on the liquid inlet through hole under its own gravity to close the liquid inlet through hole. Alternatively, the one-way liquid inlet end comprises a liquid inlet through hole and a flexible body. The liquid inlet through hole is provided on the end wall to communicate the space inside and outside the lower pump cavity. The flexible body comprises a fixed portion and a covering portion. The fixed portion is fixed on the end wall, and the covering portion covers the inner side of the end wall and covers all the liquid inlet through holes. The covering portion can be flipped away from the end wall to open the liquid inlet through hole.

9. The vacuum pump of claim 1, wherein, The liquid outlet end is a one-way liquid outlet end, which comprises a second flow channel and a one-way valve. One end of the second flow channel communicates with the upper pump cavity, and the other end serves as an output end. The one-way valve is arranged in the second flow channel and is configured to allow the liquid and air in the upper pump cavity to flow out of the second flow channel in one direction.

10. The vacuum pump of claim 1, wherein, The vacuum pump comprises a lower end in the first linear direction, which is provided with a docking portion for docking with a container. The docking portion is provided with at least one air inlet and an air filter membrane for covering the air inlet.

11. A liquid dispenser comprising a container and a vacuum pump, wherein the vacuum pump is as claimed in any one of claims 1 to 9; and wherein: The container and / or the pump body are provided with an air inlet, and the interior of the container and the external environment are connected through the air inlet. The air inlet is covered with an air filter membrane, and the one-way liquid inlet end is connected with a conduit extending into the container. Alternatively, the container comprises a peripheral side wall and a second piston. The peripheral side wall and the second piston together enclose a container cavity of the container, which extends in the first linear direction. The second piston can sealingly slide relative to the peripheral side wall in the first linear direction.

12. The liquid dispenser of claim 11, wherein, The container further comprises a base, which is arranged at the bottom of the peripheral side wall in the first linear direction. The base is provided with one or more through holes penetrating the base in the first linear direction. The peripheral wall of the base has one or more through cutouts.

Images