Pressing pump and liquid container

Abstract

A pressing pump and a liquid container. The pressing pump comprises a pump body (100), a one-way valve (200), a valve stem assembly (300), a pressing head (400), and an annular part (500). The pump body (100) is provided with an accommodating cavity (110). The valve stem assembly (300) is movably arranged in the accommodating cavity (110), the valve stem assembly (300) is provided with a piston (700), and the piston (700) is located in the accommodating cavity (110). The pressing head (400) is located outside the pump body (100) and is connected to one end of the valve stem assembly (300). The annular part (500) is arranged at the outer circumference of one end of the valve stem assembly (300) and is connected to the side wall of the pressing head (400) close to the pump body (100), the annular part (500) is inserted into the accommodating cavity (110), and the outer circumference of the annular part (500) sealably abuts against an inner wall of the accommodating cavity (110). The annular part (500) is provided with a first channel which communicates with the accommodating cavity (110), or a first channel (510) which communicates with the accommodating cavity is provided between the annular part (500) and the valve stem assembly (300). The pressing head (400) is provided with a second channel (420) which communicates with the first channel (510), and the second channel (420) is provided with a first opening (421) which is disposed on the side wall of the pressing head (400) close to the pump body (100) and which is located at the outer side of the annular part (500). According to the present pressing pump, the circumstances in which external moisture enters the pump body (100) can be reduced, and the waterproof performance is improved.

Description

Pumps and liquid containers Technical Field

[0001] The present invention relates to the technical field of liquid pumps, and in particular to a press pump and a liquid container. Background Art

[0002] A compression pump is used to squeeze liquid from a container. It typically includes a pump body and a valve stem assembly that is movably inserted into the pump body. A liquid inlet is formed at the bottom end of the pump body, and a one-way valve is installed at the liquid inlet. When the valve stem assembly moves away from the liquid inlet at the bottom end of the pump body, a negative pressure is formed in the liquid storage chamber at the bottom end of the pump body, causing the liquid storage chamber to draw liquid from the liquid inlet. When the valve stem assembly moves closer to the liquid inlet, the liquid in the liquid storage chamber is squeezed into the liquid outlet channel within the valve stem assembly. In existing compression pumps, during the process of drawing liquid, air outside the container typically enters the pump body through the gap between the pump body and the valve stem assembly, and then enters the container through the ventilation holes on the pump body. This air replenishment method is not designed properly, and external moisture can easily enter the pump body through the gap between the pump body and the valve stem assembly. The waterproof performance needs to be improved.

[0003] Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a press pump that can reduce the ingress of external moisture into the pump body and improve the waterproof performance.

[0005] The present invention also provides a liquid container having the above-mentioned press pump.

[0006] According to the first aspect of the present invention, a pressing pump includes a pump body, a one-way valve, a valve stem assembly, a pressing head and an annular portion, the pump body is provided with a accommodating chamber, and a liquid inlet is provided at the bottom of the accommodating chamber; the one-way valve is arranged at the liquid inlet; the valve stem assembly is movably arranged in the accommodating chamber, and the valve stem assembly is equipped with a piston, the piston is located in the accommodating chamber, the periphery of the piston is in contact with the inner wall of the accommodating chamber, the valve stem assembly is provided with a liquid outlet channel connected to the accommodating chamber, and the valve stem assembly and the piston can be raised and lowered relative to the liquid inlet; the pressing head is located outside the pump body and connected to one end of the valve stem assembly, and the pressing head is provided with a liquid outlet nozzle connected to the liquid outlet channel; the annular portion is arranged on the outer periphery of one end of the valve stem assembly and is connected to the pressing head The cam is connected to a side wall close to the pump body, the annular portion is inserted into the accommodating cavity and the outer periphery of the annular portion is sealed and abutted against the inner wall of the accommodating cavity; wherein, the annular portion is provided with a first channel communicating with the accommodating cavity or a first channel communicating with the accommodating cavity is provided between the annular portion and the valve stem assembly, the pressing head is provided with a second channel communicating with the first channel, the second channel has a first opening, the first opening is provided on a side wall of the pressing head close to the pump body and located on the outside of the annular portion, the outer periphery of the pump body is provided with a ventilation hole capable of communicating with the accommodating cavity, the ventilation hole is located between the annular portion and an end face of the piston close to the liquid inlet, and when the piston is close to the liquid inlet, the ventilation hole and the accommodating cavity are in a communicating state.

[0007] The pressing pump according to the embodiment of the present invention has at least the following beneficial effects: since the annular portion abuts and closes the inner wall of the accommodating chamber, during the air replenishment process, it is difficult for external air and moisture to enter the accommodating chamber from between the annular portion and the inner wall of the accommodating chamber. The external air needs to enter the first channel through the second channel and then enter the accommodating chamber, and finally enter the container through the ventilation hole. Among them, with the above-mentioned arrangement, the direction in which the air enters the second channel from the first opening is different from the direction in which the air flows in the second channel, and the direction in which the air flows in the second channel is also different from the direction in which the air flows in the first channel. In this way, the length of the air replenishment path can be increased and the air replenishment path can be made tortuous. It is not easy for external moisture to enter the first channel from the second channel and then enter the accommodating chamber of the pump body, thereby reducing the situation in which external moisture enters the interior of the pump body and improving the waterproof performance.

[0008] According to some embodiments of the present invention, a first gap is defined between the annular portion and the valve stem assembly, and the first channel is the first gap.

[0009] According to some embodiments of the present invention, the second channel has a second opening located on a side wall of the pressing head close to the pump body and inside the annular portion, and the second opening is communicated with the first channel.

[0010] According to some embodiments of the present invention, the push head is provided with a first through hole along the axial direction of the valve stem assembly, and a closing cover is installed at one end of the first through hole away from the valve stem assembly, and the closing cover and the side wall of the first through hole enclose each other to form the second channel.

[0011] According to some embodiments of the present invention, the closing cover is provided with an annular brim, a side wall of the push head away from the pump body is provided with an annular slot, the first through hole is located inside the slot, and the brim is embedded in the slot.

[0012] According to some embodiments of the present invention, the pump body includes a tubular main body and a locking piece embedded in the upper end of the main body, a liquid storage chamber is formed inside the main body below the locking piece, the liquid inlet is connected to the lower part of the liquid storage chamber, the locking piece is provided with an installation chamber, the installation chamber and the liquid storage chamber are connected through a second through hole, the accommodating chamber includes the liquid storage chamber, the installation chamber and the second through hole, and the piston is located in the liquid storage chamber.

[0013] According to some embodiments of the present invention, there is a second gap between the lower end of the locking member and the inner wall of the body, and the ventilation hole is located on the upper side of the lower end surface of the locking member and communicates with the second gap.

[0014] According to some embodiments of the present invention, when the piston is away from the liquid inlet, the upper end of the piston can block the second gap.

[0015] According to some embodiments of the present invention, a first pushing portion and a ring-shaped second pushing portion are provided on the outer periphery of the valve stem assembly, the piston is movably located between the first pushing portion and the second pushing portion, the second pushing portion is located below the piston, the entrance of the liquid outlet channel is located between the first channel portion and the second pushing portion, and the lower end surface of the piston can be separated from or approached to the second pushing portion so that the liquid outlet channel and the liquid storage chamber are connected or disconnected with each other.

[0016] A liquid container according to an embodiment of the second aspect of the present invention includes the above-mentioned press pump.

[0017] The liquid container according to the embodiment of the present invention has at least the following beneficial effects: by adopting the above-mentioned press pump, the situation where external moisture enters the container through the press pump and causes pollution can be reduced, thereby improving the waterproof performance.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] FIG1 is a schematic internal diagram of a compression pump according to an embodiment of the present invention;

[0021] Figure 2 is an enlarged view of point A in Figure 1;

[0022] Figure 3 is an enlarged view of point B in Figure 1;

[0023] Figure 4 is an enlarged view of point C in Figure 1;

[0024] FIG5 is a schematic diagram of the valve stem assembly and the pressing head of the pressing pump shown in FIG1 ;

[0025] FIG. 6 is an external schematic diagram of the pressing pump shown in FIG. 1 .

[0026] Figure markings: Pump body 100, main body 100a, locking piece 100b, mounting cavity 112, second through hole 113, liquid storage cavity 111, accommodating cavity 110, liquid inlet 120, ventilation hole 130, second gap 140, one-way valve 200, valve stem assembly 300, liquid outlet channel 310, inlet 311, first pushing part 320, second pushing part 330, pressing head 400, liquid outlet nozzle 410, second channel 420, first through hole 420a, first opening 421, second opening 422, slot 430, annular part 500, first channel 510, closing cover 600, brim 610, piston 700, spring 800. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] 1 to 3, a pressing pump according to an embodiment of the first aspect of the present invention includes a pump body 100, a one-way valve 200, a valve stem assembly 300, a pressing head 400 and an annular portion 500. The pump body 100 is provided with a receiving chamber 110, and a liquid inlet 120 is provided at the bottom of the receiving chamber 110; the one-way valve 200 is provided at the liquid inlet 120; the valve stem assembly 300 is movably provided in the receiving chamber 110, and the valve stem assembly 300 is installed with a piston 700, which is located in the receiving chamber. In the receiving chamber 110, the periphery of the piston 700 is in contact with the inner wall of the receiving chamber 110, and the valve stem assembly 300 is provided with a liquid outlet channel 310 communicating with the receiving chamber 110. The valve stem assembly 300 and the piston 700 can be raised and lowered relative to the liquid inlet 120; the pressing head 400 is located outside the pump body 100 and is connected to one end of the valve stem assembly 300. The pressing head 400 is provided with a liquid outlet nozzle 410 communicating with the liquid outlet channel 310; the annular portion 500 is provided on one end of the valve stem assembly 300. The outer periphery of the end is connected to the side wall of the pressing head 400 close to the pump body 100, the annular portion 500 is inserted into the accommodating cavity 110 and the outer periphery of the annular portion 500 is sealed against the inner wall of the accommodating cavity 110; wherein the annular portion 500 is provided with a first channel 510 communicating with the accommodating cavity 110 or a first channel 510 communicating with the accommodating cavity 110 is provided between the annular portion 500 and the valve stem assembly 300, and the pressing head 400 is provided with a second channel 42 communicating with the first channel 510 0, the second channel 420 has a first opening 421, which is provided on a side wall of the pressing head 400 close to the pump body 100 and located outside the annular portion 500. The pump body 100 is provided with a ventilation hole 130 on the periphery thereof that can communicate with the accommodating chamber 110. The ventilation hole 130 is located between the annular portion 500 and an end surface of the piston 700 close to the liquid inlet 120. When the piston 700 is close to the liquid inlet 120, the ventilation hole 130 is in a communicating state with the accommodating chamber 110.

[0032] Since the annular portion 500 is in contact and closed with the inner wall of the accommodating chamber 110, during the air replenishment process, it is difficult for external air and moisture to enter the accommodating chamber 110 from between the annular portion 500 and the inner wall of the accommodating chamber 110. External air needs to enter the first channel 510 through the second channel 420 and then enter the accommodating chamber 110, and finally enter the container through the ventilation hole 130. Among them, with the above-mentioned arrangement, the direction in which air enters the second channel 420 from the first opening 421 is different from the direction in which air flows in the second channel 420, and the direction in which air flows in the second channel 420 is also different from the direction in which air flows in the first channel 510. In this way, the length of the air replenishment path (refer to the dotted line shown in Figure 2) can be increased and the air replenishment path can be made tortuous. External moisture is not easy to enter the first channel 510 from the second channel 420 and then enter the accommodating chamber 110 of the pump body 100, thereby reducing the situation in which external moisture enters the interior of the pump body 100 and improving the waterproof performance.

[0033] Referring to Figure 2, specifically, air needs to enter the second channel 420 from the first opening 421 along the direction from the pump body 100 to the pressing head 400, and air needs to flow in the first channel 510 along the direction from the pressing head 400 to the pump body 100. Therefore, in the process of external air from the first opening 421, the second channel 420 to the first channel 510, the external air needs to make at least two turns before entering the first channel 510, while external moisture is difficult to enter the first channel 510 after two turns. The second channel 420 actually plays a role in hindering the passage of moisture, thereby reducing the situation where external moisture enters the interior of the pump body 100.

[0034] In addition, through the above-mentioned arrangement, there is no need to make the first opening 421 smaller to limit the entry of moisture into the first channel 510. The size of the first opening 421 can meet the air replenishment needs while not causing moisture to easily enter the first channel 510. In this way, the press pump provided by the present invention can replenish air smoothly and be easy to operate, while having good waterproof performance.

[0035] Specifically, when the valve stem assembly 300 and the piston 700 thereon move close to the liquid inlet 120, the one-way valve 200 closes the liquid inlet 120, so that the liquid at the bottom of the accommodating chamber 110 is input into the liquid outlet channel 310. At this time, the ventilation hole 130 is connected to the accommodating chamber 110, so that the air outside the container flows through the second channel 420, the first channel 510, the accommodating chamber 110 and the ventilation hole 130 in sequence into the container to achieve air replenishment; in the process of the valve stem assembly 300 and the piston 700 thereon moving away from the liquid inlet 120, the ventilation hole 130 is located between the annular portion 500 and an end face of the piston 700 close to the liquid inlet 120, that is, the piston 700 is at least partially located on the side of the ventilation hole 130 close to the liquid inlet 120, thereby ensuring that a negative pressure is formed between the piston 700 and the liquid inlet 120. At this time, the one-way valve 200 opens the liquid inlet 120, so that the bottom of the accommodating chamber 110 sucks the liquid in the container into it.

[0036] It should be noted that the dotted lines in FIG. 2 and FIG. 3 indicate a portion of the aforementioned air supply path, and the arrows in FIG. 2 and FIG. 3 indicate the flow direction of the air during the air supply process.

[0037] 1 and 2 , it can be imagined that, in some embodiments, there is a first gap between the annular portion 500 and the valve stem assembly 300, and the first channel 510 is the first gap. At this time, the annular portion 500 is sleeved on the valve stem assembly 300. Through the above arrangement, the first channel 510 is easy to process, and it is also convenient for the second channel 420 to communicate with the first channel 510.

[0038] 1 and 2 , it is conceivable that, in some embodiments, the second channel 420 has a second opening 422 located on a side wall of the pressing head 400 near the pump body 100 and inside the annular portion 500, and the second opening 422 is in communication with the first channel 510. Thus, the path of air entering the second channel 420 from the first opening 421 forms an angle with the path of air within the second channel 420, and the flow path of air within the second channel 420 forms an angle with the flow path of air within the first channel 510, thereby increasing resistance to moisture diversion and further reducing the ingress of moisture from the second channel 420 into the first channel 510.

[0039] 2 and 5 , it is conceivable that, in some embodiments, the push head 400 defines a first through hole 420a along the axial direction of the valve stem assembly 300, and a closing cap 600 is installed at the end of the first through hole 420a away from the valve stem assembly 300. The closing cap 600 and the sidewall of the first through hole 420a enclose and form a second channel 420. That is, after the closing cap 600 closes the end of the first through hole 420a away from the valve stem assembly 300, the first through hole 420a forms the aforementioned second channel 420, wherein the annular portion 500 separates the end of the first through hole 420a closer to the pump body 100 into a first opening 421 and a second opening 422. This arrangement facilitates the processing of the second channel 420.

[0040] 2 and 5 , it can be imagined that, in some embodiments, the closing cover 600 is provided with an annular brim 610, and an annular slot 430 is provided on one side wall of the pressing head 400 away from the pump body 100, the first through hole 420a is located inside the slot 430, and the brim 610 is embedded in the slot 430. In this way, the sealing effect between the closing cover 600 and the pressing head 400 can be ensured, and the closing cover 600 can be disassembled. Water-absorbing components such as sponges and activated carbon or breathing membranes can also be installed in the second channel 420, which can facilitate the disassembly and replacement of the water-absorbing components or breathing membranes.

[0041] 1 , it can be imagined that in some embodiments, the pump body 100 includes a tubular body 100a and a locking member 100b embedded in the upper end of the body 100a. A liquid storage chamber 111 is formed within the body 100a below the locking member 100b. A liquid inlet 120 is connected to the lower portion of the liquid storage chamber 111. The locking member 100b defines a mounting chamber 112, which is connected to the liquid storage chamber 111 via a second through hole 113. The accommodating chamber 110 includes the liquid storage chamber 111, the mounting chamber 112, and the second through hole 113. The piston 700 is located in the liquid storage chamber 111. Through the above arrangement, the piston 700 can be confined within the liquid storage chamber 111 by the locking member 100b, and the installation of the piston 700 and the valve stem assembly 300 is facilitated.

[0042] 1 and 3 , it can be imagined that, in some embodiments, a second gap 140 is present between the lower end of the locking member 100b and the inner wall of the main body 100a, and the ventilation hole 130 is located on the upper side of the lower end surface of the locking member 100b and is connected to the second gap 140. In this way, the length of the air supply path can be further increased and the air supply path can be made more tortuous, thereby effectively reducing the situation where moisture enters the interior of the container from the inside of the pump body 100 through the ventilation hole 130. Specifically, the valve stem assembly 300 is sequentially inserted into the mounting cavity 112, the communicating hole and the liquid storage cavity 111. There is a third gap between the valve stem assembly 300 and the side wall of the communicating hole for air to pass through. Therefore, the external air flows through the second channel 420, the first channel 510, the mounting cavity 112, the third gap, the liquid storage cavity 111, the second gap 140 and the ventilation hole 130 in sequence, and then enters the container. At this time, if external moisture enters the pump body 100, it is difficult for the moisture to flow upward from the liquid storage cavity 111 into the second gap 140, thereby reducing the situation where moisture enters the container from the inside of the pump body 100 through the ventilation hole 130.

[0043] 1 and 4 , it is conceivable that, in some embodiments, when the piston 700 is away from the liquid inlet 120, the upper end of the piston 700 can block the second gap 140, thereby disconnecting the ventilation hole 130 from the liquid storage chamber 111. In this way, when there is no need to squeeze liquid out of the container, that is, when the piston 700 is away from the liquid inlet 120, the interior of the container is disconnected from the outside, and external air is prevented from entering the container, which facilitates the long-term storage of the liquid in the container. Specifically, when the piston 700 is away from the liquid inlet 120, the peripheral edge of the upper end of the piston 700 can be embedded in the second gap 140 and block the second gap 140.

[0044] 1 and 5 , it can be imagined that, in some embodiments, a first pushing portion 320 and an annular second pushing portion 330 are provided on the periphery of the valve stem assembly 300, the piston 700 is movably located between the first pushing portion 320 and the second pushing portion 330, the second pushing portion 330 is located below the piston 700, the inlet 311 of the liquid outlet channel 310 is located between the first channel 510 and the second pushing portion 330, and the lower end surface of the piston 700 can be separated from or approached to the second pushing portion 330. When the valve stem assembly 300 moves away from the liquid inlet 120, the lower end surface of the piston 700 contacts the second push portion 330, disconnecting the liquid outlet channel 310 from the liquid storage chamber 111. Simultaneously, the second push portion 330 pushes the piston 700 away from the liquid inlet 120, thereby forming a negative pressure in the liquid storage chamber 111. When the valve stem assembly 300 moves closer to the liquid inlet 120, the first push portion 320 pushes the piston 700 closer to the liquid inlet 120. At this time, the second push portion 330 and the lower end surface of the piston 700 move away from each other, connecting the liquid outlet channel 310 to the liquid storage chamber 111. The liquid in the liquid storage chamber 111 is input into the liquid outlet channel 310 and ejected from the liquid outlet nozzle 410. Through the above arrangement, the piston 700 can control the connection and disconnection between the liquid outlet channel 310 and the liquid storage chamber 111.

[0045] It should be noted that in this field, other settings can also be used to control the connection between the liquid outlet channel 310 and the liquid storage chamber 111. For example, a ball valve is provided in the liquid outlet channel 310. When the valve stem assembly 300 moves close to the liquid inlet, the ball valve opens the liquid outlet channel 310. When the valve stem assembly 300 moves away from the liquid inlet, the ball valve closes the liquid outlet channel 310.

[0046] 1 , it is conceivable that, in some embodiments, a spring 800 is disposed between the push head 400 and the pump body 100 to reset the push head 400. Specifically, the spring 800 is sleeved on the valve stem assembly 300, with one end of the spring 800 located in the mounting cavity 112 and the other end located in the first passage 510.

[0047] The second embodiment of the present invention provides a liquid container comprising the aforementioned press pump, which can reduce the risk of external moisture entering the container through the press pump and causing contamination, thereby improving waterproof performance.

[0048] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A compression pump, characterized in that: include: The pump body (100) is provided with a receiving chamber (110), and a liquid inlet (120) is provided at the bottom of the receiving chamber (110); a one-way valve (200), disposed at the liquid inlet (120); A valve stem assembly (300) is movably arranged in the accommodating chamber (110), and a piston (700) is installed on the valve stem assembly (300). The piston (700) is located in the accommodating chamber (110), and the periphery of the piston (700) is in contact with the inner wall of the accommodating chamber (110). The valve stem assembly (300) is provided with a liquid outlet channel (310) communicating with the accommodating chamber (110). The valve stem assembly (300) and the piston (700) can be raised and lowered relative to the liquid inlet (120); A pressing head (400) is located outside the pump body (100) and connected to one end of the valve stem assembly (300), and the pressing head (400) is provided with a liquid outlet nozzle (410) connected to the liquid outlet channel (310); An annular portion (500) is provided on the outer periphery of one end of the valve stem assembly (300) and is connected to a side wall of the push head (400) close to the pump body (100); the annular portion (500) is inserted into the accommodating cavity (110) and the outer periphery of the annular portion (500) is in sealing contact with the inner wall of the accommodating cavity (110); The annular portion (500) is provided with a first channel (510) communicating with the accommodating chamber (110), or a first channel (510) communicating with the accommodating chamber (110) is provided between the annular portion (500) and the valve stem assembly (300), and the pressing head (400) is provided with a second channel (420) communicating with the first channel (510), and the second channel (420) has a first opening (421), and the first opening (421) is provided on the pressing head (400). ) is close to a side wall of the pump body (100) and is located on the outside of the annular portion (500); a ventilation hole (130) capable of communicating with the accommodating chamber (110) is provided on the periphery of the pump body (100); the ventilation hole (130) is located between the annular portion (500) and an end face of the piston (700) close to the liquid inlet (120); when the piston (700) is close to the liquid inlet (120), the ventilation hole (130) and the accommodating chamber (110) are in a communicating state.

2. The compression pump according to claim 1, wherein: A first gap is defined between the annular portion (500) and the valve stem assembly (300), and the first channel (510) serves as the first gap.

3. The compression pump according to claim 1, wherein: The second channel (420) has a second opening (422) located on a side wall of the pressing head (400) close to the pump body (100) and located inside the annular portion (500), and the second opening (422) is communicated with the first channel (510).

4. The compression pump according to claim 3, wherein: The push head (400) is provided with a first through hole (420a) along the axial direction of the valve stem assembly (300), and a closing cover (600) is installed at one end of the first through hole (420a) away from the valve stem assembly (300), and the closing cover (600) and the side wall of the first through hole (420a) are enclosed to form the second channel (420).

5. The compression pump according to claim 4, wherein: The closure cover (600) is provided with an annular brim (610), and a side wall of the push head (400) away from the pump body (100) is provided with an annular slot (430), the first through hole (420a) is located inside the slot (430), and the brim (610) is embedded in the slot (430).

6. The compression pump according to claim 1, wherein: The pump body (100) includes a tubular main body (100a) and a locking member (100b) embedded in the upper end of the main body (100a); a liquid storage chamber (111) is formed inside the main body (100a) below the locking member (100b); the liquid inlet (120) is communicated with the lower part of the liquid storage chamber (111); the locking member (100b) is provided with an installation chamber (112); the installation chamber (112) is communicated with the liquid storage chamber (111) via a second through hole (113); the accommodating chamber (110) includes the liquid storage chamber (111), the installation chamber (112) and the second through hole (113); and the piston (700) is located in the liquid storage chamber (111).

7. The compression pump according to claim 6, wherein: A second gap (140) exists between the lower end of the locking member (100b) and the inner wall of the body (100a), and the ventilation hole (130) is located on the upper side of the lower end surface of the locking member (100b) and communicates with the second gap (140).

8. The compression pump according to claim 7, wherein: When the piston (700) is away from the liquid inlet (120), the upper end of the piston (700) can block the second gap (140).

9. The compression pump according to claim 6, wherein: The valve stem assembly (300) is provided with a first pushing portion (320) and an annular second pushing portion (330) on its outer periphery; the piston (700) is movably located between the first pushing portion (320) and the second pushing portion (330); the second pushing portion (330) is located below the piston (700); the inlet (311) of the liquid outlet channel (310) is located between the first channel (510) and the second pushing portion (330); and the lower end surface of the piston (700) can be separated from or brought close to the second pushing portion (330).

10. A liquid container, characterized in that: Comprising the pressing pump according to any one of claims 1 to 9.