CN117837962A - Foam pump - Google Patents

Abstract

The invention discloses a foam pump, which comprises a pump body, a valve rod assembly and a waterproof cover, wherein the pump body is provided with a first accommodating cavity, and two opposite ends of the pump body are provided with mounting holes and liquid inlet channels which are communicated with the first accommodating cavity; the valve rod assembly is arranged in the first accommodating cavity, one end of the valve rod assembly is movably inserted into the mounting hole, the other end of the valve rod assembly is inserted into the liquid inlet channel, the valve rod assembly is provided with a piston, and the piston is positioned in the first accommodating cavity and is in sealing abutting joint with the side wall of the first accommodating cavity so as to separate the part, close to the liquid inlet channel, of the first accommodating cavity to form an air cavity; the waterproof cover sets up in valve rod assembly periphery and is located the one side that the piston is close to the mounting hole, and the waterproof cover has the second to hold the chamber, and the one end that the piston is close to the waterproof cover inserts and locates the second and holds the chamber, and the ventilation structure has been seted up to a lateral wall that the piston is close to the waterproof cover, and the ventilation structure is located the second and holds the axial projection scope in chamber. The foam pump provided by the invention can effectively prevent external moisture from entering the air cavity and improve the waterproof performance.

Description

Foam pump

Technical Field

The invention relates to the technical field of foam pumps, in particular to a foam pump.

Background

In the prior art, the foam pump is widely applied to products such as liquid soap, bath foam, face washing liquid and the like, and the principle of the foam pump is that working liquid such as liquid soap, bath foam or face washing liquid and the like is mixed with gas to generate foam and then pumped out. The existing foam pump generally comprises a pump body and a valve rod assembly for pumping foam, a piston on the valve rod assembly is used for changing the volume of an air cavity in the pump body, an air vent is formed in the upper side wall of the piston, a valve plate for opening and closing the air vent is arranged on the lower side wall of the piston, when the valve rod assembly drives the piston to move upwards, the valve plate opens the air vent, external air sequentially passes through a gap between the pump body and the valve rod assembly and the air vent to enter the air cavity, when the valve rod is pressed to enable the piston to compress the volume of the air cavity, the valve plate closes the air vent, and air in the air cavity enters the valve rod assembly and is mixed with liquid in the valve rod assembly. The foam pump is generally used in environments such as bathroom, and the outside environment's moisture can get into the gap between the pump body and the valve rod subassembly and then some moisture can remain on the piston upper sidewall in the use of foam pump, and when the valve rod subassembly risees, the moisture of remaining on the piston upper sidewall is inhaled the air cavity from the air vent easily for the total volume of air cavity reduces, leads to the gaseous reduction that can mix at the valve rod subassembly in-process working liquid at every time, and then the foam that produces reduces, influences the work of foam pump.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the foam pump which can effectively prevent external moisture from entering the air cavity when the valve rod assembly drives the piston to approach the mounting hole, and improve the waterproof performance.

The foam pump comprises a pump body, a valve rod assembly and a waterproof cover, wherein the pump body is provided with a first accommodating cavity, and mounting holes and liquid inlet channels which are communicated with the first accommodating cavity are formed in two opposite ends of the pump body; the valve rod assembly is arranged in the first accommodating cavity, one end of the valve rod assembly is movably inserted into the mounting hole, the other end of the valve rod assembly is inserted into the liquid inlet channel, the valve rod assembly is provided with a piston, and the piston is positioned in the first accommodating cavity and is in sealing abutting connection with the side wall of the first accommodating cavity so as to separate the part, close to the liquid inlet channel, of the first accommodating cavity to form an air cavity; the waterproof cover is arranged on the periphery of the valve rod assembly and is positioned on one side, close to the mounting hole, of the piston, the waterproof cover is provided with a second accommodating cavity, one end, close to the waterproof cover, of the piston is inserted into the second accommodating cavity, a ventilation structure is arranged on one side wall, close to the waterproof cover, of the piston, and the ventilation structure is positioned in the axial projection range of the second accommodating cavity; when the valve rod assembly drives the piston to move close to the mounting hole, an air supplementing gap exists between the side wall of the second accommodating cavity and the piston, and the second accommodating cavity is communicated with the air cavity through the air exchanging structure.

The foam pump provided by the embodiment of the invention has at least the following beneficial effects: the waterproof cover is provided with a second accommodating cavity, one end of the piston, which is close to the waterproof cover, is inserted into the second accommodating cavity, the ventilation structure is positioned in the axial projection range of the second accommodating cavity, namely, the ventilation structure can be covered by the waterproof cover, the valve rod assembly drives the piston to move close to the mounting hole, external air sequentially passes through a gap between the valve rod assembly and the pump body, an air supplementing gap between the side wall of the second accommodating cavity and the piston, and enters the air cavity after the ventilation structure, air cavity air supplementing is completed, in-process, the waterproof cover can block external liquid, and the external liquid is difficult to reach the ventilation structure through the air supplementing gap between the side wall of the second accommodating cavity and the piston, so that external moisture is effectively prevented from entering the air cavity when the valve rod assembly drives the piston to be close to the mounting hole, and the waterproof performance is improved.

According to some embodiments of the invention, the piston is provided with a protruding column extending towards the second receiving chamber, and the ventilation structure comprises a ventilation hole communicating with the air chamber, the ventilation hole being provided in the protruding column.

According to some embodiments of the invention, the ventilation structure further comprises a ventilation valve arranged at the ventilation hole, the ventilation valve is used for opening and closing the ventilation hole, and when the valve rod assembly drives the piston to move close to the mounting hole, the ventilation valve opens the ventilation hole so that the air cavity is communicated with the second accommodating cavity.

According to some embodiments of the invention, the air exchange valve comprises a hemispherical elastic body, the elastic body is located at one end of the air exchange hole, which is close to the waterproof cover, the periphery of the elastic body is connected with the side wall of the air exchange hole, the middle part of the elastic body is formed by surrounding at least two valve plates, when the valve rod assembly is static relative to the pump body, the valve plates in the middle part of the elastic body are close to each other to close the air exchange hole, and when the valve rod assembly drives the piston to move close to or away from the mounting hole, the valve plates in the middle part of the elastic body are away from each other to open the air exchange hole.

According to some embodiments of the invention, a convex ring is arranged on a side wall of the piston, which is close to the waterproof cover, the convex ring is inserted into the second accommodating cavity, the ventilation structure is positioned on the inner side of the convex ring, and when the valve rod assembly drives the piston to move close to the mounting hole, an air supplementing gap exists between the side wall of the second accommodating cavity and the convex ring.

According to some embodiments of the invention, an annular blocking wall is arranged in the second accommodating cavity, the blocking wall and the side wall of the second accommodating cavity are enclosed to form an annular slot, when the valve rod assembly drives the piston to move away from the mounting hole, the waterproof cover and the piston can relatively move close to each other, so that the convex ring is inserted into the annular slot, and the blocking wall and the side wall of the second accommodating cavity are in sealing abutting connection with the convex ring.

According to some embodiments of the invention, a side wall of the waterproof cover, which is close to the mounting hole, is provided with a ring-shaped water blocking protrusion.

According to some embodiments of the invention, the valve rod assembly comprises a movable rod slidably inserted into the mounting hole, the movable rod is provided with a first channel, one end of the waterproof cover is inserted into the first channel, the waterproof cover is provided with a second channel communicated with the first channel, two mesh fabrics for generating foam are installed at intervals in the second channel, the bottom wall of the second accommodating cavity is provided with a liquid pushing rod, the piston is installed on the liquid pushing rod, the liquid pushing rod is inserted into the liquid inlet channel, and the liquid pushing rod is provided with a third channel communicated with the second channel.

According to some embodiments of the invention, the second channel is stepped, and two mesh fabrics are mounted on two stepped walls of the second channel.

According to some embodiments of the invention, the valve rod assembly is provided with a liquid outlet channel communicated with the liquid inlet channel, the valve rod assembly is provided with an air inlet channel communicated with the liquid outlet channel, and an inlet of the air inlet channel is communicated with the second accommodating cavity; the piston and the waterproof cover can relatively move close to or away from each other, and when the valve rod assembly drives the piston to move away from the mounting hole, the waterproof cover and the piston can relatively move close to each other so that the side wall of the second accommodating cavity is in sealing abutting joint with the piston, and the second accommodating cavity is communicated with the air cavity through the ventilation structure; when the valve rod assembly drives the piston to move close to the mounting hole, the waterproof cover and the piston relatively move away from each other, so that an air supplementing gap is formed between the side wall of the second accommodating cavity and the piston.

Additional aspects and advantages of the invention 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 invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic illustration of a foam pump according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the foam pump (with the valve stem assembly stationary relative to the pump body) shown in FIG. 1;

FIG. 3 is an enlarged view of FIG. 2 at A;

FIG. 4 is a cross-sectional view of the foam pump shown in FIG. 1 (with the valve stem assembly moving the piston away from the mounting hole);

FIG. 5 is an enlarged view at B in FIG. 4;

FIG. 6 is a cross-sectional view of the foam pump shown in FIG. 1 (with the valve stem assembly moving the piston closer to the mounting hole);

FIG. 7 is an enlarged view at C in FIG. 6;

fig. 8 is a cross-sectional view of a waterproof cover of the foam pump shown in fig. 1;

FIG. 9 is an exploded view of the foam pump valve stem assembly shown in FIG. 1;

fig. 10 is an enlarged view of D in fig. 9.

Reference numerals:

the pump body 100, the body 100a, the pump cover 100b, the first accommodation chamber 110, the air chamber 111, the mounting hole 120, the liquid inlet channel 130, the valve rod assembly 200, the movable rod 210, the first channel 211, the liquid pushing rod 220, the third channel 221, the annular clamping portion 222, the piston 230, the boss 231, the ventilation structure, the ventilation hole 232, the ventilation valve 233, the elastic body, the valve plate 2331, the convex ring 234, the waterproof cover 240, the second accommodation chamber 241, the blocking wall 242, the water blocking protrusion 243, the second channel 244, the annular mounting groove 245, the annular slot 246, the needle post 250, the air supplementing gap 260, the mesh 300, and the elastic member 400.

Detailed Description

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

In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 to 3, a foam pump according to an embodiment of the present invention includes a pump body 100, a valve rod assembly 200, and a waterproof cover 240, including the pump body 100, the valve rod assembly 200, and the waterproof cover 240, the pump body 100 is provided with a first accommodating chamber 110, and both opposite ends of the pump body 100 are provided with mounting holes 120 and a liquid inlet channel 130 which are communicated with the first accommodating chamber 110; the valve rod assembly 200 is arranged in the first accommodating cavity 110, one end of the valve rod assembly 200 is movably inserted into the mounting hole 120, the other end of the valve rod assembly 200 is inserted into the liquid inlet channel 130, the valve rod assembly 200 is provided with a piston 230, and the piston 230 is positioned in the first accommodating cavity 110 and is in sealing abutting connection with the side wall of the first accommodating cavity 110 so as to separate the part of the first accommodating cavity 110, which is close to the liquid inlet channel 130, to form the air cavity 111; the waterproof cover 240 is arranged on the periphery of the valve rod assembly 200 and positioned on one side of the piston 230 close to the mounting hole 120, the waterproof cover 240 is provided with a second accommodating cavity 241, one end of the piston 230 close to the waterproof cover 240 is inserted into the second accommodating cavity 241, a ventilation structure is arranged on one side wall of the piston 230 close to the waterproof cover 240, and the ventilation structure is positioned in the axial projection range of the second accommodating cavity 241; when the valve rod assembly 200 drives the piston 230 to move close to the mounting hole 120, an air supplementing gap 260 exists between the side wall of the second accommodating cavity 241 and the piston 230, and the second accommodating cavity 241 is communicated with the air cavity 111 through an air exchanging structure.

The waterproof cover 240 is provided with a second accommodating cavity 241, one end of the piston 230, which is close to the waterproof cover 240, is inserted into the second accommodating cavity 241, the ventilation structure is located in the axial projection range of the second accommodating cavity 241, namely, the ventilation structure can be covered by the waterproof cover 240, when the valve rod assembly 200 drives the piston 230 to move close to the mounting hole 120, external air sequentially passes through a gap between the valve rod assembly 200 and the pump body 100, an air supplementing gap 260 between the side wall of the second accommodating cavity 241 and the piston 230 and the ventilation structure and then enters the air cavity 111 to complete air supplementing of the air cavity 111, in this process, the waterproof cover 240 can block external liquid, and the external liquid also can hardly reach the ventilation structure through the air supplementing gap 260 between the side wall of the second accommodating cavity 241 and the piston 230, so that external moisture is effectively prevented from entering the air cavity 111 when the valve rod assembly 200 drives the piston 230 to be close to the mounting hole 120, and the waterproof performance is improved.

Referring to fig. 2, in the embodiment, the valve stem assembly 200 is provided with a liquid outlet channel communicating with the liquid inlet channel 130, and the valve stem assembly 200 is provided with an air inlet channel communicating with the liquid outlet channel, and the air inlet channel communicates with the air chamber 111.

Referring to fig. 2 and 3, it can be appreciated that in some embodiments, the ventilation structure described above may include a ventilation hole 232 in communication with the air cavity 111, and the second accommodating cavity 241 is in communication with the air cavity 111 through the ventilation hole 232.

In some embodiments, the vent hole 232 may be provided with a one-way valve, when the valve rod assembly 200 drives the piston 230 to move close to the mounting hole 120, the one-way valve opens the vent hole 232, so that the second accommodating cavity 241 is communicated with the air cavity 111 through the vent hole 232, when the valve rod assembly 200 drives the piston 230 to move away from the mounting hole 120, the one-way valve closes the vent hole 232, so that the air cavity 111 is not communicated with the outside, and the piston 230 can pump the air in the air cavity 111 into the liquid outlet channel.

Referring to fig. 2 and 3, in some embodiments, the waterproof cover 240 and the piston 230 can move relatively close to or away from each other, when the valve rod assembly 200 drives the piston 230 to move away from the mounting hole 120, the waterproof cover 240 and the piston 230 can move relatively close to each other so that the side wall of the second accommodating cavity 241 is in sealing contact with the piston 230, and thus the air cavity 111 is not communicated with the outside, and the piston 230 can pump the air in the air cavity 111 into the liquid outlet channel, and at this time, the air vent 232 may be provided with a one-way valve or not provided with a one-way valve.

Referring to fig. 2 and 3, it is conceivable that in some embodiments, the piston 230 extends toward the second accommodating chamber 241 to form a boss 231, and the ventilation hole 232 is formed in the boss 231. If liquid is present around the protruding column 231, the protruding column 231 can block the liquid around it from entering the ventilation hole 232, thereby further preventing the liquid from entering the air cavity 111.

Referring to fig. 2 and 3, it is conceivable that in some embodiments, the ventilation structure further includes a ventilation valve 233 disposed at the ventilation hole 232, and the ventilation valve 233 is used to open and close the ventilation hole 232. Referring to fig. 6 and 7, when the valve stem assembly 200 moves the piston 230 close to the mounting hole 120, the ventilation valve 233 opens the ventilation hole 232 to communicate the air chamber 111 with the second receiving chamber 241. Referring to fig. 2 and 3, when the foam pump is not required, i.e., the valve stem assembly 200 is stationary relative to the pump body 100, the ventilation valve 233 closes the ventilation hole 232, so that external air is prevented from entering the air chamber 111, thereby forming a closed environment, and facilitating long-term storage of the product.

Referring to fig. 9 and 10, it is conceivable that in some embodiments, the ventilation valve 233 includes a hemispherical elastic body, the elastic body is located at one end of the ventilation hole 232 near the waterproof cover 240, the periphery of the elastic body is connected with the side wall of the ventilation hole 232, and the middle part of the elastic body is formed by enclosing at least two valve plates 2331, where, as shown in fig. 2 and 3, when the foam pump is not working, the valve rod assembly 200 is stationary relative to the pump body 100, and the valve plates 2331 in the middle part of the elastic body are close to close the ventilation hole 232 to close the air cavity 111, thereby effectively preventing liquid from entering the air cavity 111 through the ventilation hole 232; as shown in fig. 4 to 7, when the valve rod assembly 200 moves the piston 230 toward or away from the mounting hole 120, the valve plates 2331 in the middle of the elastic body are separated away from each other to open the ventilation hole 232, so that the second receiving chamber 241 communicates with the air chamber 111, and at this time, air may pass through the ventilation hole 232. Through the above arrangement, the scavenging valve 233 is a ball valve, which can be integrally formed with the piston 230, thereby reducing the cost, reducing the assembly process, and improving the production efficiency.

Referring to fig. 9, more specifically, the piston 230 may be provided with two or more bosses 231, each boss 231 may be provided with the above-described ventilation hole 232, and each ventilation hole 232 may be provided with the above-described ventilation valve 233.

In a specific implementation process, the above-mentioned air exchange valve 233 may also be configured as a one-way valve, when the valve rod assembly 200 drives the piston 230 to move close to the mounting hole 120, the air exchange valve 233 opens the air exchange hole 232 to communicate the air cavity 111 with the second accommodating cavity 241, and when the valve rod assembly 200 drives the piston 230 to move away from the mounting hole 120, the air exchange valve 233 closes the air exchange hole 232 to disconnect the air cavity 111 from the second accommodating cavity 241; when the foam pump is not in operation, i.e. the valve rod assembly 200 is stationary relative to the pump body 100 and the piston 230 is positioned close to the mounting hole 120, the one-way valve closes the ventilation hole 232, so that the air cavity 111 is closed, and external moisture is effectively prevented from entering the air cavity 111.

Referring to fig. 2 and 3, it is conceivable that in some embodiments, a convex ring 234 is disposed on a side wall of the piston 230 near the waterproof cover 240, the convex ring 234 is inserted into the second accommodating cavity 241, and the ventilation structure is located inside the convex ring 234, where, as shown in fig. 6 and 7, when the valve rod assembly 200 drives the piston 230 to move near the mounting hole 120, a gas supplementing gap 260 exists between the side wall of the second accommodating cavity 241 and the convex ring 234, and the ventilation structure is in a state of communicating with the air cavity 111. By the provision of the collar 234, external moisture can be further blocked from reaching the ventilation structure, and further prevented from entering the air chamber 111, thereby improving the waterproof performance.

Referring to fig. 2, 3 and 8, it is conceivable that in some embodiments, an annular blocking wall 242 is disposed in the second accommodating cavity 241, the blocking wall 242 and a side wall of the second accommodating cavity 241 enclose to form an annular slot 246, when the valve rod assembly 200 drives the piston 230 to move away from the mounting hole 120, the waterproof cover 240 and the piston 230 can relatively move to close together, so that the convex ring 234 is inserted into the annular slot 246, and the blocking wall 242 and the side wall of the second accommodating cavity 241 are in sealing abutment with the convex ring 234, so that in the process of pressing the valve rod assembly 200, that is, when the valve rod assembly 200 drives the piston 230 to move away from the mounting hole 120, the sealing effect between the convex ring 234 and the waterproof cover 240 is better, so that the air leakage condition of the air cavity 111 is effectively avoided, and normal operation of the foam pump is ensured.

Referring to fig. 2, 3 and 8, it is conceivable that in some embodiments, a water blocking protrusion 243 having a ring shape is provided on a side wall of the waterproof cover 240 near the mounting hole 120, and after the external moisture enters the mounting hole 120, the water blocking protrusion 243 can block and intercept the external moisture, and can block the external moisture from reaching the piston 230, thereby further preventing the external moisture from entering the air cavity 111 and improving the waterproof performance.

In the prior art, a net for generating foam is usually disposed in a liquid outlet channel of a foam pump, and the net is an independent component, and generally includes a pipe and a mesh 300 installed at two ends of the pipe, and the mixed gas and liquid will form foam after passing through the double-layer mesh 300.

Referring to fig. 2, 8 and 9, it is conceivable that in some embodiments, the valve rod assembly 200 includes a movable rod 210 slidably inserted into the mounting hole 120, the movable rod 210 is provided with a first channel 211, one end of a waterproof cover 240 is inserted into the first channel 211, the waterproof cover 240 is provided with a second channel 244 communicating with the first channel 211, two mesh fabrics 300 for generating foam are installed at intervals in the second channel 244, a liquid pushing rod 220 is installed at a bottom wall of the second accommodating cavity 241, a piston 230 is installed on the liquid pushing rod 220, the liquid pushing rod 220 is inserted into the liquid inlet channel 130, and the liquid pushing rod 220 is provided with a third channel 221 communicating with the second channel 244. The mesh 300 for generating foam is directly arranged on the waterproof cover 240 without arranging a net through additionally, so that the structure of the foam pump is more simplified, the assembly flow is reduced, and the production efficiency is improved.

Referring to fig. 8, it is envisioned that in some embodiments, the second passage 244 may be stepped, such that two webs 300 may be mounted on two of the stepped walls of the second passage 244, and in particular, as shown, the second passage 244 includes at least two stepped holes communicating in sequence and of different sizes, two webs 300 being mounted on the uppermost two stepped walls of the second passage 244 in a one-to-one correspondence, i.e., one web 300 being mounted on a port of the uppermost stepped hole and the other web 300 being mounted on a bottom wall of the uppermost stepped hole. Providing the second channel 244 as a step-like configuration may facilitate installation of two webs 300.

Referring to fig. 2 and 3, it is conceivable that in some embodiments, the inlet of the intake passage communicates with the second accommodation chamber 241, i.e., the inlet of the intake passage is located between the waterproof cover 240 and the piston 230; when the valve rod assembly 200 drives the piston 230 to move away from the mounting hole 120, the waterproof cover 240 and the piston 230 can relatively move close to enable the side wall of the second accommodating cavity 241 to be in sealing abutting connection with the piston 230, the second accommodating cavity 241 is communicated with the air cavity 111 through a ventilation structure, at the moment, the piston 230 compresses the volume of the air cavity 111, gas in the air cavity 111 firstly enters between the waterproof cover 240 and the piston 230 through the ventilation structure, and then the gas enters a liquid outlet channel through an air inlet channel; when the valve rod assembly 200 drives the piston 230 to move close to the mounting hole 120, the waterproof cover 240 and the piston 230 relatively move away from each other to form an air supplementing gap 260 between the side wall of the second accommodating cavity 241 and the piston 230, so that external air sequentially enters the air cavity 111 from the gap between the valve rod assembly 200 and the pump body 100, the air supplementing gap 260 and the ventilation structure.

With the above arrangement, when the working fluid is reversed in the foam pump, that is, the working fluid is reversed into the air intake passage, the working fluid does not directly enter the air chamber 111, but first enters between the waterproof cover 240 and the piston 230. When the piston 230 is provided with the convex column 231 and the ventilation structure includes the ventilation hole 232 disposed in the convex column 231, the convex column 231 can block the countercurrent working fluid from entering the ventilation hole 232, thereby effectively preventing the countercurrent working fluid from entering the air cavity 111; when the piston 230 is provided with the convex ring 234, the convex ring 234 may block the flow of the working fluid in the reverse flow to the point where the piston 230 and the pump body 100 are in contact with each other.

Referring to fig. 2 and 3, it is conceivable that in some embodiments, the bottom wall of the second accommodating cavity 241 is provided with an annular mounting groove 245, the liquid pushing rod 220 is slidably inserted into the annular mounting groove 245, an annular clamping portion 222 is disposed on an inner wall of the third channel 221, the first control valve includes a pin 250, one end of the pin 250 is clamped in the second channel 244, the other end of the pin 250 is inserted into the third channel 221 and is located at a side of the annular clamping portion 222 away from the waterproof cover 240, wherein when the valve rod assembly 200 drives the piston 230 to move close to the mounting hole 120, the liquid pushing rod 220 moves away from the waterproof cover 240 first, so that a gas supplementing gap 260 is formed between a sidewall of the second accommodating cavity 241 and the piston 230, and the pin 250 and the annular clamping portion 222 are mutually matched and abutted and sealed.

In some embodiments, a gap exists between the liquid pushing rod 220 and the annular air intake passage to form the air intake passage described above. Of course, in other embodiments, the air intake channel may be formed on the outer wall of the liquid pushing rod 220.

It should be noted that, in the implementation process, other arrangement modes may be adopted to realize the relative movement of the waterproof cover 240 and the piston 230, for example, the waterproof cover 240 is fixed on the valve rod assembly 200, the piston 230 is slidably sleeved on the valve rod assembly 200, a pushing portion is disposed on the periphery of the valve rod assembly 200, and then, when the valve rod assembly 200 is pressed, the valve rod assembly 200 drives the waterproof cover 240 to move down so as to make the waterproof cover 240 and the piston 230 in sealing contact, and then, the piston 230 is driven to move down by the waterproof cover 240, and when the valve rod assembly 200 moves up, the valve rod assembly 200 drives the waterproof cover 240 to move away from the piston 230 so that an air supplementing gap 260 exists between the piston 230 and the waterproof cover 240, and then, the pushing portion abuts against the piston 230 so as to make the piston 230 and the waterproof cover 240 move up together.

It should be noted that, in some embodiments, the inlet of the air intake passage may also be located at the lower side of the piston 230, and at this time, a valve may be disposed at the inlet of the air intake passage, where when the valve rod assembly 200 drives the piston 230 to be away from the mounting hole 120, the valve is opened, so that the air in the air cavity 111 may enter the liquid outlet passage, and when the valve rod assembly 200 drives the piston 230 to be close to the mounting hole 120, the valve is closed, so as to prevent the working liquid in the liquid outlet passage from entering the air cavity 111 from the air intake passage.

Referring to fig. 2, it is envisioned that in some embodiments, a resilient member 400 is disposed between the valve stem assembly 200 and the pump body 100, the resilient member 400 being configured to drive the valve stem assembly 200 to move the piston 230 closer to the mounting hole 120.

Specifically, the elastic member 400 may be provided as a spring, and the spring is sleeved on the valve rod assembly 200 and located in the mounting hole 120, so that the spring is located outside the air cavity 111 and the liquid inlet channel 130, and contact between the spring and the working liquid can be effectively avoided.

In some embodiments, the spring is a plastic spring, so that the problem that the metal spring rusts to cause working failure can be avoided, the plastic spring can also avoid polluting working liquid, and in addition, all parts of the foam pump can be made into plastic parts, so that the foam pump is convenient to recycle and more environment-friendly.

Referring to fig. 2, it is envisioned that in some embodiments, the pump body 100 includes a pump body 100 and a pump cap 100b, and the first receiving cavity 110 is defined by the pump body 100 and the pump cap 100 b.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims (10)

1. A foam pump, comprising:

the pump body (100) is provided with a first accommodating cavity (110), and mounting holes (120) and liquid inlet channels (130) which are communicated with the first accommodating cavity (110) are formed in two opposite ends of the pump body (100);

the valve rod assembly (200) is arranged in the first accommodating cavity (110), one end of the valve rod assembly (200) is movably inserted into the mounting hole (120), the other end of the valve rod assembly is inserted into the liquid inlet channel (130), the valve rod assembly (200) is provided with a piston (230), and the piston (230) is positioned in the first accommodating cavity (110) and is in sealing abutting connection with the side wall of the first accommodating cavity (110) so as to separate the part, close to the liquid inlet channel (130), of the first accommodating cavity (110) to form an air cavity (111);

the waterproof cover (240) is arranged on the periphery of the valve rod assembly (200) and is positioned on one side, close to the mounting hole (120), of the piston (230), the waterproof cover (240) is provided with a second accommodating cavity (241), one end, close to the waterproof cover (240), of the piston (230) is inserted into the second accommodating cavity (241), a ventilation structure is arranged on one side wall, close to the waterproof cover (240), of the piston (230), and the ventilation structure is positioned in the axial projection range of the second accommodating cavity (241);

when the valve rod assembly (200) drives the piston (230) to move close to the mounting hole (120), an air supplementing gap (260) exists between the side wall of the second accommodating cavity (241) and the piston (230), and the second accommodating cavity (241) is communicated with the air cavity (111) through the air exchanging structure.

2. Foam pump according to claim 1, characterized in that the piston (230) is provided with a projection (231) extending towards the second receiving chamber (241), the venting structure comprising a venting hole (232) communicating with the air chamber (111), the venting hole (232) being provided in the projection (231).

3. The foam pump of claim 2, wherein the ventilation structure further comprises a ventilation valve (233) disposed at the ventilation hole (232), the ventilation valve (233) being configured to open and close the ventilation hole (232), the ventilation valve (233) opening the ventilation hole (232) to communicate the air chamber (111) with the second accommodating chamber (241) when the valve stem assembly (200) drives the piston (230) to move closer to the mounting hole (120).

4. A foam pump according to claim 3, wherein the air exchange valve (233) comprises a hemispherical elastic body, the elastic body is located at one end of the air exchange hole (232) close to the waterproof cover (240), the periphery of the elastic body is connected with the side wall of the air exchange hole (232), the middle part of the elastic body is formed by surrounding at least two valve plates (2331), when the valve rod assembly (200) is static relative to the pump body (100), the valve plates (2331) in the middle part of the elastic body are close to each other to close the air exchange hole (232), and when the valve rod assembly (200) drives the piston (230) to move close to or away from the mounting hole (120), the valve plates (2331) in the middle part of the elastic body are away from each other to open the air exchange hole (232).

5. The foam pump according to claim 2, wherein a collar (234) is provided on a side wall of the piston (230) adjacent to the waterproof cover (240), the collar (234) is inserted into the second accommodating chamber (241), the ventilation structure is located inside the collar (234), and when the valve rod assembly (200) drives the piston (230) to move adjacent to the mounting hole (120), a gas supplementing gap (260) is formed between the side wall of the second accommodating chamber (241) and the collar (234).

6. The foam pump according to claim 5, wherein an annular blocking wall (242) is disposed in the second accommodating cavity (241), the blocking wall (242) and a side wall of the second accommodating cavity (241) enclose to form an annular slot (246), when the valve rod assembly (200) drives the piston (230) to move away from the mounting hole (120), the waterproof cover (240) and the piston (230) can relatively move close together, so that the convex ring (234) is inserted into the annular slot (246), and the blocking wall (242) and the side wall of the second accommodating cavity (241) are in sealing butt with the convex ring (234).

7. Foam pump according to claim 1, characterized in that a side wall of the waterproof cover (240) close to the mounting hole (120) is provided with a water retaining protrusion (243) in the shape of a ring.

8. The foam pump according to claim 1, wherein the valve rod assembly (200) comprises a movable rod (210) slidably inserted into the mounting hole (120), the movable rod (210) is provided with a first channel (211), one end of the waterproof cover (240) is inserted into the first channel (211), the waterproof cover (240) is provided with a second channel (244) communicated with the first channel (211), two mesh fabrics (300) for producing foam are installed at intervals in the second channel (244), a liquid pushing rod (220) is installed at the bottom wall of the second accommodating cavity (241), the piston (230) is installed at the liquid pushing rod (220), the liquid pushing rod (220) is inserted into the liquid inlet channel (130), and the liquid pushing rod (220) is provided with a third channel (221) communicated with the second channel (244).

9. The foam pump of claim 8, wherein the second channel (244) is stepped, and two of the webs (300) are mounted to two of the stepped walls of the second channel (244).

10. The foam pump of any one of claims 1 to 9, wherein:

the valve rod assembly (200) is provided with a liquid outlet channel communicated with the liquid inlet channel (130), the valve rod assembly (200) is provided with an air inlet channel communicated with the liquid outlet channel, and an inlet of the air inlet channel is communicated with the second accommodating cavity (241);

the piston (230) and the waterproof cover (240) can relatively move close to or away from each other, when the valve rod assembly (200) drives the piston (230) to move away from the mounting hole (120), the waterproof cover (240) and the piston (230) can relatively move close to each other so that the side wall of the second accommodating cavity (241) is in sealing abutting connection with the piston (230), and the second accommodating cavity (241) is communicated with the air cavity (111) through the ventilation structure;

when the valve rod assembly (200) drives the piston (230) to move close to the mounting hole (120), the waterproof cover (240) and the piston (230) relatively move away so that an air supplementing gap (260) is formed between the side wall of the second accommodating cavity (241) and the piston (230).