CN219699831U - Liquid buffering structure, liquid buffering box and cleaning equipment - Google Patents

Abstract

The utility model discloses a liquid cache structure, a liquid cache box and cleaning equipment. The liquid buffering structure comprises a piston cylinder and a piston. The piston cylinder comprises a first piston cylinder communicated with the buffer liquid inlet and the buffer liquid outlet and a second piston cylinder for injecting or extracting the filling medium. The piston comprises a first stage piston and a second stage piston which are connected with each other, wherein the cross-sectional area of the first stage piston is smaller than that of the second stage piston. When the filling medium is pumped out from the second piston cylinder, the first piston cylinder sucks liquid from the buffer liquid inlet. When filling medium is injected into the second piston cylinder, the first piston cylinder discharges liquid from the buffer liquid outlet. In the technical scheme of the utility model, the first-stage piston is matched with the first piston cylinder for sucking liquid or discharging liquid, and the cross section area of the first-stage piston is small and the resistance is small; the second-stage piston is matched with the second piston cylinder to provide movement power, the cross section area of the second-stage piston is large, the stress is large, and the smooth movement of the piston is realized by utilizing the large power to resist small resistance.

Description

Liquid buffering structure, liquid buffering box and cleaning equipment

Technical Field

The utility model relates to the technical field of cleaning, in particular to a liquid caching structure, a liquid caching box and cleaning equipment.

Background

For a cleaning device for cleaning a surface, cleaning liquid and clear water are generally mixed to serve as liquid for cleaning the surface, the cleaning device is provided with a device for pumping the cleaning liquid, in the related art, the resistance of movement between a piston of a common piston type cleaning liquid pumping device and the side wall of a piston cylinder is large, the operation is unsmooth, the piston can be blocked and not move, and the function of a cleaning liquid buffer tank is invalid.

Disclosure of Invention

Embodiments of the present utility model provide a liquid caching structure, a liquid caching tank, and a cleaning apparatus.

The embodiment of the utility model provides a liquid caching structure, which comprises a piston cylinder and a piston, wherein the piston cylinder comprises a first piston cylinder and a second piston cylinder, the first piston cylinder is used for communicating a caching liquid inlet and a caching liquid outlet, and the second piston cylinder is used for injecting or extracting filling media; the piston comprises a first-stage piston and a second-stage piston which are connected with each other, the first piston cylinder is used for accommodating the first-stage piston, the second piston cylinder is used for accommodating the second-stage piston, and the cross-sectional area of the first-stage piston is smaller than that of the second-stage piston; when the filling medium is extracted from the second piston cylinder, the second-stage piston moves to drive the first-stage piston to be far away from the buffer liquid inlet and the buffer liquid outlet, so that the first piston cylinder sucks liquid from the buffer liquid inlet; when filling medium is injected into the second piston cylinder, the second-stage piston moves to drive the first-stage piston to be close to the buffer liquid inlet and the buffer liquid outlet, so that the first piston cylinder discharges liquid from the buffer liquid outlet.

In certain embodiments, the first stage piston and the second stage piston are each hollow in structure.

In certain embodiments, the liquid caching structure further comprises a first seal disposed on an outer peripheral wall of the first stage piston, the first seal in contact with an inner wall of the first piston barrel.

In certain embodiments, the liquid caching structure further comprises a second seal disposed on an outer peripheral wall of the second stage piston, the second seal in contact with an inner wall of the second piston barrel.

In certain embodiments, the liquid caching structure further comprises an end cap connected to a side of the second piston cylinder remote from the first piston cylinder; the end cap is provided with a control port through which the filling medium is withdrawn or injected.

In some embodiments, the end cap is used for limiting the second-stage piston, and the total length of the first-stage piston and the second-stage piston is greater than the depth of the inner cylinder of the second piston cylinder, so that when the second-stage piston abuts against the end cap, a part of the first-stage piston, which is far away from the second-stage piston, is positioned in the first piston cylinder.

In some embodiments, the liquid buffering structure further comprises a limiting part, the limiting part is provided with a buffering liquid inlet and a buffering liquid outlet, the limiting part is used for limiting the first-stage piston, and when the first-stage piston abuts against the limiting part, the first-stage piston is used for sealing the buffering liquid inlet and the buffering liquid outlet.

In some embodiments, the total length of the first-stage piston and the second-stage piston is greater than the depth of the inner cylinder of the first piston cylinder, so that when the first-stage piston abuts against the limiting portion, a part of the second-stage piston, which is far away from the first-stage piston, is located in the second piston cylinder.

In some embodiments, an air hole is formed in one side, close to the first piston cylinder, of the second piston cylinder, and the air hole is communicated with the second piston cylinder and the outside.

The embodiment of the utility model provides a liquid cache box, which comprises the liquid cache structure of any one embodiment and a transmission pipe, wherein the transmission pipe is communicated with a cache liquid inlet and a cache liquid outlet.

In some embodiments, the transmission pipe comprises a liquid inlet and a liquid outlet, the liquid inlet is connected with the buffer liquid inlet through a first one-way valve, and the buffer liquid outlet is connected with the liquid outlet through a second one-way valve; the first one-way valve is in one-way conduction in the direction from the liquid inlet to the buffer liquid inlet; the second one-way valve is in one-way conduction in the direction from the buffer liquid outlet to the liquid outlet.

An embodiment of the present utility model provides a cleaning apparatus including a cleaning member and the liquid cache tank of any one of the above embodiments, the cleaning member being capable of cleaning with liquid in the liquid cache tank; wherein the cleaning device comprises at least one of: cleaning robot, clean basic station, hand-held type washing machine.

In the liquid buffering structure, the liquid buffering box and the cleaning equipment provided by the embodiment of the utility model, the first-stage piston is matched with the first piston cylinder to suck or discharge liquid, and the cross section area of the first-stage piston is small and the resistance is small; the second-stage piston is matched with the second piston cylinder to provide movement power, the cross section area of the second-stage piston is large, and the stress is large, so that the large power can be utilized to resist small resistance, and smooth movement of the piston is realized.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the present utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic illustration of a liquid cache tank in accordance with certain embodiments of the present utility model;

FIG. 2 is a schematic illustration of a liquid cache tank in accordance with certain embodiments of the present utility model;

FIG. 3 is a schematic illustration of a liquid cache tank in accordance with certain embodiments of the present utility model;

fig. 4 is a schematic view of a cleaning apparatus according to some embodiments of the utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model.

Referring to fig. 1, an embodiment of the present utility model provides a liquid buffering structure 100, where the liquid buffering structure 100 includes a piston cylinder 110 and a piston 120, the piston cylinder 110 includes a first piston cylinder 111 and a second piston cylinder 112, the first piston cylinder 111 is used for communicating with a buffering liquid inlet 210 and a buffering liquid outlet 220, and the second piston cylinder 112 is used for injecting or extracting a filling medium. The piston 120 includes a first stage piston 121 and a second stage piston 122 connected to each other, the first stage piston 121 being accommodated in the first cylinder 111, the second stage piston 122 being accommodated in the second cylinder 112, the cross-sectional area of the first stage piston 121 being smaller than the cross-sectional area of the second stage piston 122. When the filling medium is pumped out of the second piston cylinder 112, the second stage piston 122 moves to drive the first stage piston 121 away from the buffer inlet 210 and the buffer outlet 220, so that the first piston cylinder 111 sucks in the liquid from the buffer inlet 210. When filling medium is injected into the second piston cylinder 112, the second stage piston 122 moves to drive the first stage piston 121 to approach the buffer liquid inlet 210 and the buffer liquid outlet 220, so that the first piston cylinder 111 discharges liquid from the buffer liquid outlet 220.

Specifically, the liquid may be any one of cleaning liquid, clean water and sewage, and in the embodiment of the present utility model, the cleaning liquid is taken as an example for explanation.

The piston cylinder 110 is the main body of the liquid buffering structure 100, and the piston cylinder 110 is divided into two sections, namely a first piston cylinder 111 and a second piston cylinder 112. The first piston cylinder 111 is used for communicating with the buffer liquid inlet 210 and the buffer liquid outlet 220, and can be matched with the first stage piston 121 to extract and store liquid. The second piston cylinder 112 may cooperate with the second stage piston 122 for injecting or withdrawing a filling medium to power the first stage piston 121.

When the filling medium is pumped out of the second piston cylinder 112, the second-stage piston 122 moves in a direction away from the first piston cylinder 111 due to the acting force generated by pumping out the filling medium, and the second-stage piston 122 is connected with the first-stage piston 121, so that the second-stage piston 122 drives the first-stage piston 121 to be away from the buffer liquid inlet 210 and the buffer liquid outlet 220, negative pressure is generated in the first piston cylinder 111, and liquid enters the first piston cylinder 111 through the buffer liquid inlet 210; when filling medium is injected into the second piston cylinder 112, the second-stage piston 122 moves towards the direction approaching the first piston cylinder 111 due to the acting force generated by the injection of the filling medium, and the second-stage piston 122 drives the first-stage piston 121 to approach the buffer liquid inlet 210 and the buffer liquid outlet 220, so that the liquid in the first piston cylinder 111 is discharged through the buffer liquid outlet 220. The filling medium may be a gas or a liquid, and in one embodiment the filling medium is for example air, which may be pumped or injected by an air pump.

Because the principle of the piston determines that the piston must be in sealing abutment with the inner side wall of the housing. In order to ensure smooth movement of the piston in the seat, friction resistance between the piston and the inner side wall of the seat needs to be reduced. In the related art, lubricating oil or lubricating grease is generally smeared between the piston and the inner side wall of the seat body, and the cleaning liquid has the characteristic of dissolving grease and stains, so that the cleaning liquid is very easy to dissolve the lubricating oil or the lubricating grease due to the existence of the cleaning liquid, so that the lubrication between the piston and the seat body fails, the inner side wall of the piston and the seat body is easy to block, and the movement is unsmooth.

In the liquid buffering structure 100 of the present utility model, the piston 120 is divided into two stages, namely, a first stage piston 121 and a second stage piston 122 which are connected with each other, wherein the first stage piston 121 and the second stage piston 122 can be connected with each other through a connecting piece 123, and the first stage piston 121, the second stage piston 122 and the connecting piece 123 can be integrally formed. The cross-sectional area of the first stage piston 121 is smaller than the cross-sectional area of the second stage piston 122. The first-stage piston 121 is matched with the first-stage piston 111 to realize the functions of extracting and storing liquid, the diameter of the first-stage piston 121 is small, and the resistance between the first-stage piston 121 and the inner side wall of the piston cylinder is small; the second piston cylinder 112 is matched with the second-stage piston 122 to provide motion power, the second-stage piston 122 has large diameter, large cross-sectional area and large stress, the contact area between the filling medium and the second-stage piston 122 is large in the process of filling the filling medium into the second piston cylinder 112, and the second-stage piston 122 is easier to push, so that the large power can be utilized to resist small resistance, the smooth motion of the whole piston is realized, and the smooth pumping of liquid is realized. The liquid buffer structure 100 of the present utility model can use the air source as the power source, has a simple structure, and can be driven by the air source together with other components. For example, a waterway system may be provided in a cleaning base station cooperating with the cleaning robot, water supplied to the cleaning robot for self-cleaning by the waterway system, and sewage after self-cleaning by the cleaning robot is recovered, and the waterway system pumps the cleaning water and sewage to a recovery tank or a pump sewer due to the need. Therefore, the waterway system generally needs to be provided with a power element, the power element can comprise an air pump and/or a water pump, water can not pass through the pump body without passing through the pump body due to the working principle of the air pump, thereby reducing the risk of jamming of impurities in the water, and being beneficial to prolonging the service life of the power element.

Of course, it is understood that the liquid buffer structure 100 may not be limited to the water channel system provided at the base station, but may be a water channel system provided at the cleaning robot, and correspondingly, the power element of the water channel system of the cleaning robot may also include an air pump.

In certain embodiments, the first stage piston 121 and the second stage piston 122 are each hollow in structure.

In this way, material of the first stage piston 121 and the second stage piston 122 can be saved, thereby saving costs. In addition, the hollow structure can make the first stage piston 121 and the second stage piston 122 lighter in weight under the same material, so that the first stage piston and the second stage piston can be pushed under the action of filling media.

Specifically, the first stage piston 121 and the second stage piston 122 may be formed by injection molding, and when the first stage piston 121 and the second stage piston 122 are formed by injection molding, the wall thickness of each part of the first stage piston 121 should be as uniform as possible, so that the wall thickness of each part of the second stage piston 122 is as uniform as possible, and the risks of shrinkage shadows, bubbles, deformation and the like of the first stage piston 121 or the second stage piston 122 caused by uneven molding filling and cooling shrinkage are avoided. In addition, the wall thickness of the first stage piston 121 is in a first wall thickness range, the wall thickness of the second stage piston 122 is in a second wall thickness range, and the first wall thickness range and the second wall thickness range may be the same or different, and the values of the first wall thickness range and the second wall thickness range are not particularly limited herein. Under the condition of meeting the structure and use requirements, the wall thickness is as small as possible, so that the plastic mold can be cooled quickly, the mass of the first-stage piston 121 and the second-stage piston 122 is small, the materials are saved, and the cost is reduced.

In certain embodiments, the liquid cache structure 100 further comprises a first seal 130, the first seal 130 being provided on the outer circumferential wall of the first stage piston 121, the first seal 130 being in contact with the inner wall of the first piston cylinder 111.

In this way, the liquid in the first piston cylinder 111 can be sealed by the first seal 130.

Specifically, the first seal 130 may be a seal ring. The outer peripheral wall of the first stage piston 121 may be provided with a first receiving groove, and the first sealing member 130 may be at least partially received in the first receiving groove and contact with the inner wall of the first piston cylinder 111, so that the first sealing member 130 seals the liquid in the first piston cylinder 111 from flowing from the first piston cylinder 111 to the second piston cylinder 112. Because the diameter of the first stage piston 121 is small, the circumference of the first seal 130 is small, and the resistance is small, facilitating pushing of the first stage piston 121.

In certain embodiments, the liquid handling structure 100 further includes a second seal 140, the second seal 140 being disposed on the outer peripheral wall of the second stage piston 122, the second seal 140 being in contact with the inner wall of the second piston cylinder 112.

In this way, the filling medium in the second piston cylinder 112 can be sealed by the second seal 140.

In particular, the second seal 140 may be a sealing ring. The outer peripheral wall of the second stage piston 122 may be provided with a second receiving groove, and the second sealing member 140 may be at least partially received in the second receiving groove and contact the inner wall of the second piston cylinder 112, so that the second sealing member 140 seals the filling medium in the second piston cylinder 112, thereby enabling injection or extraction of the filling medium to power the movement of the second stage piston 122. Because the second-stage piston 122 has a large diameter, a large area and a large stress, the injection or extraction of the filling medium can make the second-stage piston 122 have a large power, so that the first-stage piston 121 can be pushed conveniently.

In some embodiments, the second stage piston 122 and the second sealing member 140 may increase the lubrication oil, the second piston cylinder 112 is used for allowing the filling medium to enter, and the cleaning solution does not substantially enter the second piston cylinder 112, so that the lubrication oil is coated between the second piston cylinder 112 and the second stage piston 122, and the cleaning solution does not enter the second piston cylinder 112 to dissolve and fail the lubrication oil, and the lubrication oil is not easy to fail between the second piston cylinder 112 and the second stage piston 122, so that the friction resistance between the second stage piston 122 and the second sealing member 140 and the second piston cylinder 112 can be further reduced, so that the filling medium can be injected or extracted to provide greater power for the second stage piston 122, so as to facilitate pushing the first stage piston 121.

In certain embodiments, the liquid caching structure 100 further comprises an end cap 150, the end cap 150 being connected to the side of the second piston cylinder 112 remote from the first piston cylinder 111; the end cap 150 is provided with a control port 151 through which the filling medium is withdrawn or injected.

Specifically, the filling medium is pumped out through the control port 151 to enable the second piston cylinder 112 to form negative pressure, the second-stage piston 122 moves towards the direction close to the end cover 150, the second-stage piston 122 drives the first-stage piston 121 to be far away from the buffer liquid inlet 210 and the buffer liquid outlet 220, so that negative pressure is generated in the first piston cylinder 111, and liquid enters the first piston cylinder 111 through the buffer liquid inlet 210; filling medium is injected through the control port 151 so that the second piston cylinder 112 forms positive pressure, the second-stage piston 122 moves in a direction away from the end cover 150, and the second-stage piston 122 drives the first-stage piston 121 to be close to the buffer liquid inlet 210 and the buffer liquid outlet 220, so that liquid in the first piston cylinder 111 is discharged through the buffer liquid outlet 220.

In this way, the second stage piston 122 can be controlled to move by pumping or injecting the filling medium through the control port 151, and thus the first stage piston 121 can be driven to control the suction and discharge of the liquid.

In some embodiments, the end cap 150 is removably coupled to the second piston cylinder 112, e.g., the end cap 150 and the second piston cylinder 112 may be removably coupled by a threaded connection, a snap fit connection, or the like, such that the piston 120 may be easily installed into the piston cylinder 110 from a side of the second piston cylinder 112 remote from the first piston cylinder 111, or the piston 120 may be removed from the piston cylinder 110.

In some embodiments, the end cap 150 is used to limit the second stage piston 122, and the total length of the first stage piston 121 and the second stage piston 122 is greater than the depth of the inner cylinder of the second piston cylinder 112, so that when the second stage piston 122 abuts the end cap 150, a portion of the first stage piston 121 away from the second stage piston 122 is located within the first piston cylinder 111.

In this way, the end cap 150 is used to limit the second stage piston 122, so as to prevent the second stage piston 122 from separating from the second piston cylinder 112 and prevent the first stage piston 121 from separating from the first piston cylinder 111.

Specifically, when the filling medium is extracted from the second piston cylinder 112, the second-stage piston 122 moves in a direction away from the first piston cylinder 111. When the second stage piston 122 is limited by the end cap 150, the second stage piston 122 is located at the position farthest from the first stage piston cylinder 111, and since the first stage piston 121 and the second stage piston 122 are connected to each other, the total length of the first stage piston 121 and the second stage piston 122 (i.e., the total length of the piston 120 is the sum of the length of the first stage piston 121, the length of the connecting piece 123, and the length of the second stage piston 122) is greater than the depth of the inner cylinder of the second stage piston cylinder 112, so that when the second stage piston 122 abuts against the end cap 150, the portion of the first stage piston 121 far from the second stage piston 122 is located in the first stage piston cylinder 111, and thus, the end cap 150 can prevent the second stage piston 122 from being separated from the second stage piston cylinder 112; the total length of the first stage piston 121 and the second stage piston 122 is greater than the depth of the inner cylinder of the second piston cylinder 112, so that the first stage piston 121 can be prevented from being separated from the first piston cylinder 111.

Referring to fig. 2 and 3, in some embodiments, the liquid buffering structure 100 further includes a limiting portion 160, the limiting portion 160 is provided with a buffering liquid inlet 210 and a buffering liquid outlet 220, the limiting portion 160 is used for limiting the first stage piston 121, and when the first stage piston 121 abuts against the limiting portion 160, the first stage piston 121 is used for sealing the buffering liquid inlet 210 and the buffering liquid outlet 220.

Specifically, the limiting portion 160 is provided with a buffer inlet 210 and a buffer outlet 220, and when filling medium is injected from the second piston cylinder 112, the second stage piston 122 moves in a direction approaching the first piston cylinder 111 and drives the first stage piston 121 to approach the limiting portion 160. When the first-stage piston 121 is limited by the limiting portion 160, the first-stage piston 121 is at a position farthest from the second piston cylinder 112, and one end of the first-stage piston 121, which is far away from the second-stage piston 122, seals the buffer liquid inlet 210 and the buffer liquid outlet 220.

When the liquid buffer structure 100 is in a normal state, if the liquid outlet 320 receives a negative pressure from the outside or the liquid inlet 310 receives a positive pressure from the outside, it may cause the liquid to be discharged and flowed in under an abnormal condition, and by sealing the buffer liquid inlet 210 and the buffer liquid outlet 220 by using the first stage piston 121, the external pressure can be blocked, so as to avoid the liquid from being discharged and flowed in under the abnormal condition.

In this manner, sealing the buffer inlet 210 and the buffer outlet 220 prevents fluid from flowing in or out when the liquid outlet 320 is at a negative pressure or when the liquid inlet 310 is at a positive pressure.

In some embodiments, the total length of the first stage piston 121 and the second stage piston 122 is greater than the depth of the inner barrel of the first piston barrel 111, such that when the first stage piston 121 abuts the stop 160, a portion of the second stage piston 122 distal from the first stage piston 121 is within the second piston barrel 112.

In this way, the first stage piston 121 is limited by the limiting portion 160, so as to prevent the first stage piston 121 from separating from the first piston cylinder 111 and prevent the second stage piston 122 from separating from the second piston cylinder 112.

Specifically, when the filling medium is injected from the second piston cylinder 112, the second-stage piston 122 moves in a direction approaching the first piston cylinder 111 and drives the first-stage piston 121 to approach the stopper 160. When the first-stage piston 121 abuts against the limiting portion 160, the first-stage piston 121 is located at a position farthest from the second piston cylinder 112, and since the first-stage piston 121 and the second-stage piston 122 are connected with each other, the total length of the first-stage piston 121 and the second-stage piston 122 is greater than the depth of the inner cylinder of the first piston cylinder 111, when the first-stage piston 121 abuts against the limiting portion 160, the part of the second-stage piston 122 far from the first-stage piston 121 is located in the second piston cylinder 112, and thus the limiting portion 160 can prevent the first-stage piston 121 from being separated from the first piston cylinder 111; the total length of the first stage piston 121 and the second stage piston 122 is greater than the depth of the inner cylinder of the first piston cylinder 111, so that the second stage piston 122 can be prevented from being separated from the second piston cylinder 112.

The amount of movement of the first stage piston 121 per time can be determined by the limitation of the end cap 150 and the limitation part 160, thereby determining the amount of liquid to be sucked and discharged per time.

In some embodiments, an air hole 1121 is provided on a side of the second piston cylinder 112 near the first piston cylinder 111, and the air hole 1121 communicates the second piston cylinder 112 with the outside.

In this way, the pressure variation between the first stage piston 121 and the second stage piston 122 can be balanced by the air hole 1121.

Specifically, the second piston cylinder 112 is provided with an air hole 1121 at a side close to the first piston cylinder 111, the air hole 1121 communicates the second piston cylinder 112 with the outside, and since the cross-sectional area of the first stage piston 121 and the cross-sectional area of the second stage piston 122 are different, when the first stage piston 121 and the second stage piston 122 move, the space between the first stage piston 121 and the second stage piston 122 changes, resulting in a pressure change, and the air hole 1121 can be used to balance the pressure change. For example, when the filling medium is pumped out from the second piston cylinder 112, the second-stage piston 122 moves in a direction away from the first piston cylinder 111 and drives the first-stage piston 121 to be away from the buffer liquid inlet 210 and the buffer liquid outlet 220, so that a space between the first-stage piston 121 and the second-stage piston 122 is enlarged, and external air can enter the second piston cylinder 112 through the air hole 1121; when filling medium is injected from the second piston cylinder 112, the second-stage piston 122 moves towards the direction approaching the first piston cylinder 111 and drives the first-stage piston 121 to approach the buffer liquid inlet 210 and the buffer liquid outlet 220, so that the space between the first-stage piston 121 and the second-stage piston 122 is reduced, and air in the second piston cylinder 112 can enter the outside through the air hole 1121, thereby balancing pressure change caused by space change between the first-stage piston 121 and the second-stage piston 122.

The embodiment of the utility model provides a liquid cache tank 1000, where the liquid cache tank 1000 includes the liquid cache structure 100 and the transmission pipe 300 of any one of the above embodiments, and the transmission pipe 300 is communicated with the cache liquid inlet 210 and the cache liquid outlet 220.

Specifically, the liquid buffering structure 100 controls the movement of the second stage piston 122 in the second piston cylinder 112 through the control port 151, and controls the movement of the first stage piston 121 in the first piston cylinder 111 to transmit the negative pressure or the positive pressure to the transmission pipe 300. Thus, by combining the liquid-buffering structure 100 and the transfer tube 300, the drawing in and discharging of the liquid can be achieved.

In some embodiments, the liquid cache structure 100 and the transfer tube 300 may be integrally formed. In other embodiments, the liquid cache structure 100 and the transfer tube 300 may be formed separately from each other and coupled together by a threaded connection, a snap-fit connection, or the like.

In some embodiments, the transfer tube 300 includes a liquid inlet 310 and a liquid outlet 320, the liquid inlet 310 is connected to the buffer liquid inlet 210 through a first one-way valve 330, and the buffer liquid outlet 220 is connected to the liquid outlet 320 through a second one-way valve 340. Wherein, the first check valve 330 is turned on unidirectionally in a direction from the liquid inlet 310 to the buffer liquid inlet 210, and the second check valve 340 is turned on unidirectionally in a direction from the buffer liquid outlet 220 to the liquid outlet 320.

In particular, the first and second check valves 330 and 340 may be duckbill valves or umbrella valves. When liquid is required to be pumped in, the second stage piston 122 drives the first stage piston 121 to be far away from the buffer liquid inlet 210 and the buffer liquid outlet 220, so that negative pressure is generated in the first piston cylinder 111, at the moment, the first one-way valve 330 is opened, the second one-way valve 340 is closed, and liquid enters the first piston cylinder 111 through the liquid inlet 310 and the buffer liquid inlet 210. When the liquid needs to be discharged, the second stage piston 122 drives the first stage piston 121 to approach the buffer liquid inlet 210 and the buffer liquid outlet 220, so that positive pressure is generated in the first piston cylinder 111, at this time, the first one-way valve 330 is closed, the second one-way valve 340 is opened, and the liquid in the first piston cylinder 111 is discharged through the buffer liquid outlet 220 and the liquid outlet 320.

Thus, by providing the first check valve 330 and the second check valve 340, the passage for discharging the liquid can be closed when the liquid needs to be sucked, and the passage for sucking the liquid can be closed when the liquid needs to be discharged, thereby preventing the occurrence of abnormal situations.

Referring to fig. 2, in one embodiment, the first stage piston 121 seals the buffer inlet 210 and the buffer outlet 220, so that the buffer inlet 210 and the buffer outlet 220 are normally closed, and the cleaning solution is prevented from being directly pumped out of the cleaning solution bottle of the inlet 310 when the liquid outlet 320 is connected to the cleaning solution tank and the cleaning solution tank needs to pump negative pressure to enter the cleaning solution.

Referring to fig. 4, an embodiment of the present utility model provides a cleaning apparatus, including a cleaning member and a liquid cache tank 1000 according to any one of the above embodiments, the cleaning member being capable of cleaning with a liquid in the liquid cache tank 1000, wherein the cleaning apparatus includes at least one of: cleaning robot, clean basic station, hand-held type washing machine. Specifically, the cleaning member may be a water tank, a mop, etc., and the liquid buffer tank 1000 performs operations of sucking and discharging liquid during cleaning of the cleaning apparatus. In this manner, cleaning may be made more efficient by incorporating the liquid cache tank 1000 in the cleaning apparatus.

In the liquid buffering structure 100, the liquid buffering box 1000 and the cleaning device according to the embodiment of the utility model, the first-stage piston 121 is matched with the first piston cylinder 111 for sucking liquid or discharging liquid, the cross-sectional area of the first-stage piston 121 is small, and the resistance is small; the second-stage piston 122 is matched with the second piston cylinder 112 to provide movement power, and the cross section area of the second-stage piston 122 is large and the stress is large, so that the large power can be utilized to resist small resistance, and smooth movement of the piston is realized.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The present utility model may repeat reference numerals and/or letters in the various examples, and this repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (12)

1. A liquid cache structure, comprising:

the piston cylinder comprises a first piston cylinder and a second piston cylinder, the first piston cylinder is used for communicating the buffer liquid inlet and the buffer liquid outlet, and the second piston cylinder is used for injecting or extracting the filling medium;

the piston comprises a first-stage piston and a second-stage piston which are connected with each other, the first piston cylinder is used for accommodating the first-stage piston, the second piston cylinder is used for accommodating the second-stage piston, and the cross-sectional area of the first-stage piston is smaller than that of the second-stage piston;

when the filling medium is extracted from the second piston cylinder, the second-stage piston moves to drive the first-stage piston to be far away from the buffer liquid inlet and the buffer liquid outlet, so that the first piston cylinder sucks liquid from the buffer liquid inlet;

when filling medium is injected into the second piston cylinder, the second-stage piston moves to drive the first-stage piston to be close to the buffer liquid inlet and the buffer liquid outlet, so that the first piston cylinder discharges liquid from the buffer liquid outlet.

2. The liquid caching structure of claim 1, wherein the first stage piston and the second stage piston are each hollow structures.

3. The liquid caching structure of claim 1, further comprising:

and the first sealing piece is arranged on the outer peripheral wall of the first-stage piston and is in contact with the inner wall of the first piston cylinder.

4. The liquid caching structure of claim 1, further comprising:

and the second sealing piece is arranged on the outer peripheral wall of the second-stage piston and is in contact with the inner wall of the second piston cylinder.

5. The liquid caching structure of claim 1, further comprising:

the end cover is connected to one side, far away from the first piston cylinder, of the second piston cylinder; the end cap is provided with a control port through which the filling medium is withdrawn or injected.

6. The liquid buffering structure according to claim 5, wherein the end cover is used for limiting the second-stage piston, and the total length of the first-stage piston and the second-stage piston is larger than the depth of the inner cylinder of the second piston cylinder, so that when the second-stage piston abuts against the end cover, a part, far away from the second-stage piston, of the first-stage piston is located in the first piston cylinder.

7. The liquid caching structure of claim 1, further comprising:

the limiting part is provided with the cache liquid inlet and the cache liquid outlet, and is used for limiting the first-stage piston, and when the first-stage piston is abutted to the limiting part, the first-stage piston is used for sealing the cache liquid inlet and the cache liquid outlet.

8. The liquid buffering structure according to claim 7, wherein the total length of the first-stage piston and the second-stage piston is larger than the depth of the inner cylinder of the first piston cylinder, so that when the first-stage piston abuts against the limiting portion, a portion of the second-stage piston away from the first-stage piston is located in the second piston cylinder.

9. The liquid buffering structure according to claim 1, wherein an air hole is formed in one side, close to the first piston cylinder, of the second piston cylinder, and the air hole is communicated with the second piston cylinder and the outside.

10. A liquid cache tank, characterized in that the liquid cache tank comprises the liquid cache structure according to any one of claims 1-9 and a transmission pipe, wherein the transmission pipe is communicated with the cache liquid inlet and the cache liquid outlet.

11. The liquid cache box according to claim 10, wherein the transmission pipe comprises a liquid inlet and a liquid outlet, the liquid inlet is connected with the cache liquid inlet through a first one-way valve, and the cache liquid outlet is connected with the liquid outlet through a second one-way valve;

the first one-way valve is in one-way conduction in the direction from the liquid inlet to the buffer liquid inlet;

the second one-way valve is in one-way conduction in the direction from the buffer liquid outlet to the liquid outlet.

12. A cleaning apparatus comprising a cleaning member and the liquid cache tank of claim 10 or 11, the cleaning member being capable of cleaning with liquid in the liquid cache tank; wherein the cleaning device comprises at least one of: cleaning robot, clean basic station, hand-held type washing machine.