Patent Description:
Foam spraying can is a common spraying device with strong practicability, and is widely used for cleaning work in different places such as homes, companies and schools and the like due to the characteristics of small size, small occupied area, easy to carry, handheld operation and the like. When cleaning and washing objects, the spray head of the foam spraying can mix the cleaning agent or disinfectant with water and air and sprays it from the nozzle, thereby spraying a certain amount of foam.

However, the existing spraying cans require the cleaning agent in the liquid tank to be sucked into the spray head during use. As the cleaning agent inside the liquid tank gradually decreases, the pressure in the liquid tank will decrease, and the pressure difference between the inside and outside will easily lead to the problem of deformation and damage to the liquid tank. Therefore, in the prior art, the liquid tank is generally provided with an air inlet to equalize the pressure inside the liquid tank. However, when the spraying can is inverted, the air inlet is easy for the cleaning agent or disinfectant to leak outward, and the cleaning agent or disinfectant will contaminate the liquid tank lid, so that the liquid tank lid is not suitable for using by hand touch.

<CIT> teaches a sprayer can selectively spray mixed solution or clear water only. The sprayer includes a housing provided with a diversion chamber, an adjustment portion disposed on the housing and connected to the chamber, a spray portion connected to the housing, and a spray head. A mixture channel and a clear-water channel are arranged between the housing and the spray portion. The adjustment portion is rotatable and aligned with the chamber. The spray head has at least one clear-water nozzle and a mixture nozzle. The adjustment portion is rotatable manually for allowing clear water flowing to the clear-water nozzle to be sprayed out and also the adjustment portion is rotatable manually for allowing both clear water and liquid flowing into the mixture channel and then mixed to form mixed solution which is sprayed out through the mixture nozzle.

<CIT> teaches a spray dispenser. The spray dispenser includes a container for holding liquid and a dispensing assembly for extracting liquid from the container. The dispensing assembly includes a pressure-relief valve for release of excessive pressure in the container and a filter arranged to permit egress of gas through the filter inhibit egress of liquid from the container and to inhibit ingress of contaminants into the container through the pressure relief valve.

<CIT> teaches a pistol sprayer that can be in an upside-up mode and an upside-down mode. The pistol sprayer includes a body, a shell sleeved on the body, a liquid spraying channel and a liquid pressing channel communicated with each other, a liquid guiding cavity, a piston arranged in the liquid guiding cavity, a valve cavity communicated with the liquid guiding cavity, and an elastic valve core. The elastic valve element includes an upper elastic pipe and a lower elastic pipe, and a valve element check piece is arranged between the upper elastic pipe and the lower elastic pipe in an up-down movable mode. An inverted spraying device achieving the upside-up spraying and the upside-down spraying is connected to the elastic valve element in an inserted mode.

The present disclosure aims at providing a leak-proof foam spraying can. The invention is as defined in claim <NUM>, preferred features are defined in the dependent claims. By mounting a duckbill valve in the liquid tank lid, the duckbill valve can be opened when the spraying can is in use and suck air to equalize the pressure, or it can be closed when the spraying can is inverted to avoid leaking cleaning agent or disinfectant.

Preferably, a clip piece is provided in the nozzle, and the clip piece is a metal clip piece, and the included angle of the metal clip piece is ninety degrees. The direction of the foam sprayed out from the spraying can can be changed by adjusting the opening angle of the clip piece, so that a user can conveniently control the direction of the foam and the spraying area. The spray head pushes the foam to be uniformly sprayed along the planes of the two right-angled edges of the metal clip piece, and the sprayed sector is uniform and does not diverge.

Preferably, the outer side wall of the liquid tank is provided with a spiral snap, the outer side wall of the liquid injection port is provided with an external thread, the liquid tank lid is provided with a spiral snap groove and an internal thread, the spiral snap and the spiral snap groove are snapped together, the external thread and the internal thread are rotatably snapped together to ensure that the liquid injection port of the liquid tank and the liquid tank lid can be firmly mounted and are not easy to fall off.

Preferably, the spiral snap is so configured, that the spiral snap and the spiral snap groove are screwed for sixty degrees to ninety degrees and engaged, so that the liquid tank lid and the liquid tank can be quickly assembled together without screwing the liquid tank lid too much, thereby saving manual operation.

Preferably, the inner side of the liquid tank lid is provided with a cylindrical element, and the outer wall of the cylindrical element is provided with a cylindrical element sealing ring. The cylindrical element can ensure that the liquid tank lid and the liquid tank can be fitted together more tightly, while the cylindrical element sealing ring can enhance the tightness between the cylindrical element and the liquid injection port.

Preferably, the cylindrical element sealing ring comprises a first cylindrical element sealing ring and a second cylindrical element sealing ring, the first cylindrical element sealing ring and the second cylindrical element sealing ring are sleeved on the cylindrical element respectively. The first cylindrical element sealing ring and the second cylindrical element sealing ring can provide a better sealing effect to avoid the liquid inside the liquid tank from leaking out of the liquid tank lid.

Preferably, a liquid tank sealing ring is arranged at the connection between the liquid tank and the liquid tank lid. The liquid tank sealing ring can enhance the tightness between the liquid tank lid and the liquid injection port.

Preferably, the liquid tank sealing ring comprises a first liquid tank sealing ring and a second liquid tank sealing ring, the first liquid tank sealing ring and the second liquid tank sealing ring are sleeved on the liquid tank respectively. The first liquid tank sealing ring and the second liquid tank sealing ring can provide a better sealing effect to avoid the liquid inside the liquid tank from leaking out of the liquid tank lid.

Compared with the prior art, the present disclosure has the following advantageous effects:
In the present disclosure, by providing the liquid tank lid with a mounting hole which penetrates through the liquid tank lid along the vertical direction and by mounting the duckbill valve in the mounting hole along the direction of its opening facing downward, since the duckbill valve has the characteristic that the outward flow along the direction of the opening of the duckbill valve is not obstructed, while the reverse flow is obstructed, air can flow towards the inside of the liquid tank along the opening of the duckbill valve so as to equalize the pressure in the liquid tank and ensure that the liquid in the liquid tank can be normally sucked into the spray head, and the liquid in the liquid tank cannot leak out from the liquid tank through the opening of the duckbill valve, so the duckbill valve plays the function of preventing the backflow of liquid. Therefore, when the liquid tank lid is inverted, the cleaning agent or detergent inside the liquid tank will not flow out from the liquid tank, and the liquid will not leak out whether the liquid tank is tilted or inverted, so that users can use it with confidence.

Therefore, the present disclosure provides a leak-proof foam spraying can. By mounting a duckbill valve in the liquid tank lid, the duckbill valve can be opened when the spraying can is in use and suck air to equalize the pressure, or it can be closed when the spraying can is inverted to avoid leaking cleaning agent or disinfectant.

The technical solutions of the embodiments of the present disclosure will be clearly and entirely described below with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are just a part of the embodiments of the present disclosure, and are not all of them. All other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present disclosure without any creative effort are included in the protection scope of the present disclosure.

It should be noted that, all the directional indications (such as up, down, left, right, front, rear. ) in the embodiments of the present disclosure are merely used for explaining the relative positional relationship and movement conditions and the like between each part under a certain posture (as shown in the drawings), if such a posture changes, then the directional indications are changed correspondingly.

In the present disclosure, such description involving "first" and "second" and the like are merely for the purpose of description, but cannot be understood as indicating or implying its relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the feature defined with "first" and "second" can explicitly or implicitly include at least one such feature; secondly, in the description of the present disclosure, "a plurality of" means at least two, for example, two, three and the like, unless otherwise specifically defined.

In the present disclosure, unless otherwise definitely prescribed and defined, the terms "connection", "connects", "connected", "fixed" and the like should be understood in its broad sense. For example, the "connection" may be a fixed connection, may also be a detachable connection or an integrated connection; may be a mechanical connection, may also be an electrical connection; and the "connected" may be directly connected and can also be indirectly connected through an intermediate medium, and can also be the internal communication inside two elements or an interaction relationship between two elements, unless otherwise definitely defined. The specific meaning of the above-mentioned terms in the present disclosure may be understood by those of ordinary skill in the art in light of specific circumstances.

In addition, the technical solutions between each embodiment in the present disclosure can be mutually combined, but should be on the basis that the technical solutions can be realized by those skilled in the art, when the combination of the technical solutions is contradictory or cannot be realized, it should be deemed that the combination of technical solutions does not exist and does not fall within the protection scope claimed by the present disclosure.

The embodiments of the present disclosure provide a leak-proof foam spraying can. The names of the components corresponding to the reference numerals in the figures are as follows: <NUM>. liquid tank; <NUM>. liquid tank lid; <NUM>. liquid injection port; <NUM>. first duckbill valve; <NUM>. second duckbill valve; <NUM>. cylindrical element; <NUM>. First liquid tank sealing ring; <NUM>. Second liquid tank sealing ring; <NUM>. first cylindrical element sealing ring; <NUM>. second cylindrical element sealing ring; <NUM>. spray head; <NUM>. nozzle; <NUM>. spiral snap groove; <NUM>. internal thread; <NUM>. external thread; <NUM>. spiral snap; <NUM>. metal tube; <NUM>. clip piece;<NUM>. first metal filter disc; <NUM>. second metal filter disc; <NUM>. sponge filter disc; <NUM>. polygon positioning element.

A leak-proof foam spraying can includes a liquid tank <NUM>, a liquid tank lid <NUM> and a duckbill valve, wherein the top of the liquid tank <NUM> is provided with a liquid injection port <NUM>, the liquid tank lid 2is engaged on the liquid injection port <NUM>, the liquid tank lid <NUM> is provided with a mounting hole which penetrates through the liquid tank lid <NUM> along the vertical direction from the top to the bottom, and the duckbill valve is mounted in the mounting hole and the opening of the duckbill valve faces downward.

The use and working method of the present disclosure is as follows:
the duckbill valve is mounted in the mounting hole and the opening of the duckbill valve faces downward, the liquid tank lid <NUM> is engaged on the liquid injection port <NUM> to accomplish the assembly of the liquid tank lid <NUM>, and when in use, the liquid in the liquid tank <NUM> is sucked into the spray head <NUM> and is sprayed out through the nozzle <NUM>, air enters the liquid tank <NUM> downwards along the duckbill valve to equalize the pressure of the liquid tank <NUM> and the outside environment, when the liquid tank <NUM> is inclined or inverted, the opening of the duckbill valve is closed, and the liquid cannot leak out of the duckbill valve. When in use, the cleaning agent or detergent inside the liquid tank <NUM> is sucked into the spray head <NUM>, the spray head <NUM> is connected with the high-pressure water gun. The high-pressure water flow, cleaning agent or detergent and air are mixed and foamed in the metal tube <NUM> and finally sprayed out through the nozzle <NUM>.

As shown in <FIG>, the duckbill valve comprises a first duckbill valve <NUM> and a second duckbill valve <NUM>. The mounting hole includes a first mounting hole arranged on one side of the liquid tank lid <NUM> and a second mounting hole arranged on the other side of the liquid tank lid <NUM>. The first duckbill valve <NUM> is mounted in the first mounting hole and the second duckbill valve <NUM> is mounted in the second mounting hole. Separate arrangement of the first duckbill valve <NUM> and the second duckbill valve <NUM> can improve the air inlet efficiency of the liquid tank lid <NUM> to ensure that the pressure inside the liquid tank <NUM> is balanced with the outside environment.

As shown in <FIG> and <FIG>, the outer side wall of the liquid tank <NUM> is provided with a spiral snap <NUM>, the outer side wall of the liquid injection port <NUM> is provided with an external thread <NUM>, the liquid tank lid <NUM> is provided with a spiral snap groove <NUM> and an internal thread <NUM>, the spiral snap <NUM> and the spiral snap groove <NUM> are snapped together, the external thread <NUM> and the internal thread <NUM> are rotatably snapped together to ensure that the liquid injection port <NUM> of the liquid tank <NUM> and the liquid tank lid <NUM> can be firmly mounted and are not easy to fall off.

As shown in <FIG> and <FIG>, the spraying can further includes a spray head <NUM>, the spray head <NUM> is inserted in the liquid tank lid <NUM>, the liquid tank lid <NUM> is engaged on the liquid injection port <NUM> of the liquid tank <NUM>, a polygon hole is provided in the interior of the spray head <NUM>, a metal tube <NUM> is provided in the spray head <NUM>, a polygon positioning element <NUM> is provided on the metal tube <NUM>, the metal tube <NUM> is inserted in the polygon hole, the polygon positioning element <NUM> is engaged in the polygon hole, the spray head <NUM> sprays foam through a nozzle <NUM>, and the metal tube 17connects the spray head <NUM> and the nozzle <NUM>. The polygon positioning element <NUM> and each edge of the polygon hole are fitted each other. When the high-pressure waterflow flows through the metal tube <NUM>, the metal tube <NUM> does not rotate in the polygon hole, thus avoiding the situation where the metal tube <NUM> rotates in the polygon hole due to the influence of the high-pressure water flow, so that the spray head <NUM> is damaged. Moreover, the metal tube <NUM> can partially transmit the expansion pressure to the polygon hole through the polygon positioning element <NUM>. By distributing the expansion pressure to the other fitting parts of the spray head <NUM>, the expansion pressure borne by the metal tube <NUM> becomes smaller, so that the degree of wear of the metal tube <NUM> is reduced and the service life is increased.

The metal filter disc is provided in the interior of the metal tube <NUM>, and the metal filter disc comprises a first metal filter disc <NUM> and a second metal filter disc <NUM>, the first metal filter disc 19and the second metal filter disc20are sequentially arranged in the metal tube17, and a sponge filter disc <NUM> is provided between the first metal filter disc <NUM> and the second metal filter disc <NUM>. The metal filter disc has a bubbling effect. After the liquid and water in the liquid tank are mixed with air, a large amount of bubbles are generated through the metal filter disc, thus realizing the purpose of spraying foam from the spray can. The sponge filter disc <NUM> can reduce the gap between the first metal filter disc <NUM> and the second metal filter disc <NUM>, thus significantly increasing the foam consistency.

Aclip piece <NUM> is provided in the nozzle <NUM>, and the clip piece <NUM> is a metal clip piece, and the included angle of the metal clip piece is ninety degrees. The direction of the foam sprayed out from the spraying can can be changed by adjusting the opening angle of the clip piece <NUM>, so that a user can conveniently control the direction of the foam and the spraying area. The spray head <NUM> pushes the foam to be uniformly sprayed along the planes of the two right-angled edges of the clip piece <NUM>, and the sprayed sector is uniform and does not diverge.

The spiral snap <NUM> is so configured, that the spiral snap and the spiral snap groove 13are screwed for sixty degrees to ninety degrees and engaged, so that the liquid tank lid <NUM> and the liquid tank <NUM> can be quickly assembled to gether without screwing the liquid tank lid <NUM> too much, thereby saving manual operation.

The inner side of the liquid tank lid <NUM> is provided with a cylindrical element <NUM>, and the outer wall of the cylindrical element <NUM> is provided with a cylindrical element sealing ring. The cylindrical element <NUM> can ensure that the liquid tank lid <NUM> and the liquid tank <NUM> can be fitted together more tightly, while the cylindrical element sealing ring can enhance the tightness between the cylindrical element <NUM> and the liquid injection port <NUM>.

The cylindrical element sealing ring comprises a first cylindrical element sealing ring <NUM> and a second cylindrical element sealing ring <NUM>, the first cylindrical element sealing ring <NUM> and the second cylindrical element sealing ring <NUM> are sleeved on the cylindrical element 6respectively. The first cylindrical element sealing ring <NUM> and the second cylindrical element sealing ring <NUM> can provide a better sealing effect to avoid the liquid inside the liquid tank <NUM> from leaking out of the liquid tank lid <NUM>.

A liquid tank sealing ring is arranged at the connection between the liquid tank <NUM> and the liquid tank lid <NUM>. The liquid tank sealing ring can enhance the tightness between the liquid tank lid <NUM> and the liquid injection port <NUM>.

The liquid tank sealing ring comprises a first liquid tank sealing ring <NUM> and a second liquid tank sealing ring <NUM>, the first liquid tank sealing ring <NUM> and the second liquid tank sealing ring <NUM> are sleeved on the liquid tank 1respectively. The first liquid tank sealing ring <NUM> and the second liquid tank sealing ring <NUM> can provide a better sealing effect to avoid the liquid inside the liquid tank <NUM> from leaking out of the liquid tank lid <NUM>.

Claim 1:
A leak-proof foam spraying can, characterized in that the leak-proof foam spraying can includes a liquid tank (<NUM>), a spray head (<NUM>), a liquid tank lid (<NUM>) and a duckbill valve, wherein the top of the liquid tank (<NUM>) is provided with a liquid injection port (<NUM>), the liquid tank lid (<NUM>) is engaged on the liquid injection port (<NUM>), the liquid tank lid (<NUM>) is provided with a mounting hole which penetrates through the liquid tank lid (<NUM>) along the vertical direction from the top to the bottom, and the duckbill valve is mounted in the mounting hole and the opening of the duckbill valve faces downward, wherein the spray head (<NUM>) is inserted in the liquid tank lid (<NUM>), the liquid tank lid is engaged on the liquid injection port (<NUM>), a polygon hole is provided in the interior of the spray head (<NUM>), a metal tube (<NUM>) is provided in the spray head (<NUM>), a polygon positioning element (<NUM>) is provided on the metal tube (<NUM>), the metal tube (<NUM>) is inserted in the polygon hole, the polygon positioning element (<NUM>) is engaged in the polygon hole, the spray head (<NUM>) sprays foam through a nozzle (<NUM>), and the metal tube (<NUM>) connects the spray head (<NUM>) and the nozzle (<NUM>), and wherein a metal filter disc is provided in the interior of the metal tube (<NUM>), and the metal filter disc comprises a first metal filter disc (<NUM>) and a second metal filter disc (<NUM>), the first metal filter disc (<NUM>) and the second metal filter disc (<NUM>) are sequentially arranged in the metal tube (<NUM>), and a sponge filter disc (<NUM>) is provided between the first metal filter disc (<NUM>) and the second metal filter disc (<NUM>).