Liquid injection device

Abstract

The embodiment of the utility model provides a liquid injection device. The liquid injection device comprises a shell assembly and a liquid injection assembly. The shell assembly is provided with a liquid storage cavity and a liquid supply opening, and the liquid storage cavity is communicated with the liquid supply opening. The liquid injection assembly comprises a liquid injection head and a one-way valve, the liquid injection head is provided with a liquid injection opening, the liquid injection head covers the end, provided with the liquid supply opening, of the shell assembly so that a liquid outlet path can be formed between the liquid supply opening and the liquid injection opening, and the one-way valve is arranged between the liquid injection head and the liquid supply opening. Therefore, the liquid outlet path can be switched between connection and disconnection. The liquid injection device provided by the embodiment of the utility model can reduce the risk of liquid leakage.

Description

Technical Field

[0001] The present application relates to the field of liquid injection technology, and in particular to a liquid injection device. Background Art

[0002] The injection device can be used to replenish the atomizing liquid into the electronic atomizing device. In the related art, the injection device can replenish the minoxidil solution into the head atomizing drug delivery device.

[0003] However, during the injection process, the injection device in the related art is prone to leakage. For example, the minoxidil solution inside may leak out due to inversion, thereby wasting the solution and causing pollution. Utility Model Content

[0004] In view of this, the main purpose of the embodiments of the present application is to provide a liquid injection device that can reduce the risk of liquid leakage.

[0005] To achieve the above objectives, the technical solution of the embodiment of the present application is implemented as follows:

[0006] The present invention provides a liquid injection device, comprising:

[0007] A housing assembly having a liquid storage cavity and a liquid supply port, wherein the liquid storage cavity is in communication with the liquid supply port;

[0008] The liquid injection assembly includes a liquid injection head and a one-way valve. The liquid injection head has a liquid injection port, and the liquid injection head cover is arranged at one end of the shell assembly having the liquid supply port to form a liquid outlet path between the liquid supply port and the liquid injection port. The one-way valve is arranged between the liquid injection head and the liquid supply port to switch between opening and closing the liquid outlet path.

[0009] In one embodiment, the one-way valve is arranged at the liquid supply port, and the one-way valve has a valve port respectively connected to the liquid supply port and the liquid injection port, and the valve port is located on the liquid outlet path. Under the action of external force, the one-way valve switches between opening and closing the valve port to switch between opening and closing the liquid outlet path.

[0010] In one embodiment, the one-way valve includes a valve body and a valve nozzle, the valve body cover is arranged at the liquid supply port, and the valve nozzle is located at one end of the valve body close to the liquid injection port, and the valve nozzle includes a first fitting portion and a second fitting portion arranged on the valve body, and at the end of the valve nozzle close to the liquid injection port, at least part of the first fitting portion and the second fitting portion are disconnected and fit together to form a closed valve port, and when the shell assembly is squeezed by external force, under the action of the air pressure difference inside and outside the liquid storage chamber, the disconnected parts of the first fitting portion and the second fitting portion are separated from each other to open the valve port.

[0011] In one embodiment, the cross-sectional dimension of the valve body gradually decreases from the end away from the liquid injection port to the end close to the liquid injection port; and / or,

[0012] The cross-sectional dimension of the valve nozzle gradually decreases from an end away from the liquid injection port to an end close to the liquid injection port.

[0013] In one embodiment, the first fitting portion and the second fitting portion are both inclined surfaces, and from an end away from the liquid injection port to an end close to the liquid injection port, the first fitting portion and the second fitting portion are inclined in a direction toward each other.

[0014] In one embodiment, the valve body has air holes, which are respectively connected to the liquid storage chamber and the outside world, so that an air exchange path flowing through the air holes is formed between the outside world and the liquid storage chamber.

[0015] In one embodiment, the side wall of the liquid supply port protrudes outward from the liquid storage cavity to form a connecting boss, the liquid injection head has an installation cavity connected to the liquid injection port, the one-way valve is arranged in the installation cavity, the liquid injection head cover is arranged on the connecting boss, and the connecting boss extends into the installation cavity so that the one-way valve is squeezed and fixed at the liquid supply port.

[0016] In one embodiment, the connecting boss includes a connecting end surface close to the liquid injection port, and a flange is formed on one end of the one-way valve close to the connecting boss, and the flange is in contact with the connecting end surface.

[0017] In one embodiment, the liquid injection head includes a liquid injection body and a sealing cover, the liquid injection body has the liquid injection port, and the sealing cover is detachably mounted on the liquid injection port.

[0018] In one embodiment, the one-way valve is made of one of silicone and rubber; and / or the hardness of the one-way valve is greater than or equal to Shore A 40 and less than or equal to Shore A 80.

[0019] The embodiment of the present application provides a liquid injection device, which includes a housing assembly and a liquid injection assembly. The housing assembly has a liquid storage chamber and a liquid supply port, and the liquid storage chamber is connected to the liquid supply port. The liquid injection assembly includes a liquid injection head and a one-way valve. The liquid injection head has a liquid injection port, and the liquid injection head cover is provided at one end of the housing assembly having the liquid supply port so that a liquid outlet path is formed between the liquid supply port and the liquid injection port. The one-way valve is provided between the liquid injection head and the liquid supply port to switch between opening and closing the liquid outlet path. Thus, by providing the one-way valve, during the process of the liquid injection device injecting liquid into the electronic atomization device, the one-way valve can open the liquid outlet path so that the atomized liquid in the liquid storage chamber flows out along the liquid outlet path to replenish the atomized liquid in the electronic atomization device. At the same time, after the liquid injection is completed, the one-way valve can close the liquid outlet path to prevent the atomized liquid in the liquid storage chamber from flowing out from the liquid supply port and the liquid injection port, thereby reducing the risk of leakage, preventing the atomized liquid in the liquid storage chamber from being exposed, and thus preventing the problem of solution waste and pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a liquid injection device according to one embodiment of the present application;

[0021] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0022] Figure 3 for Figure 1 Exploded view of the liquid injection device;

[0023] Figure 4 for Figure 3 Schematic diagram of the structure of the one-way valve.

[0024] Description of Reference Numerals

[0025] 10. Shell assembly; 10a. Liquid storage chamber; 10b. Liquid supply port; 11. Connecting boss; 11a. Connecting end face; 20. Liquid injection assembly; 21. Liquid injection head; 21a. Liquid injection port; 21b. Mounting chamber; 211. Liquid injection body; 212. Sealing cover; 22. One-way valve; 22a. Valve port; 221. Valve body; 221a. Air hole; 222. Valve nozzle; 223. First fitting portion; 224. Second fitting portion; 225. Flanging. DETAILED DESCRIPTION

[0026] An embodiment of the present application provides a liquid injection device, see Figure 1 The liquid injection device includes a shell assembly 10 and a liquid injection assembly 20.

[0027] The housing assembly 10 has a liquid storage chamber 10 a and a liquid supply port 10 b , and the liquid storage chamber 10 a is communicated with the liquid supply port 10 b .

[0028] See also Figure 2 The liquid injection assembly 20 includes a liquid injection head 21 and a one-way valve 22. The liquid injection head 21 has a liquid injection port 21a, and the liquid injection head 21 is covered on one end of the shell assembly 10 having a liquid supply port 10b, so that a liquid outlet path is formed between the liquid supply port 10b and the liquid injection port 21a. The one-way valve 22 is arranged between the liquid injection head 21 and the liquid supply port 10b to switch between opening and closing the liquid outlet path.

[0029] Specifically, the liquid injection device is used to replenish the atomized liquid in the electronic atomization device. The electronic atomization device can be any type of atomization device, such as a scalp atomization drug delivery device, where the atomized liquid stored in the electronic atomization device is a medication solution, such as minoxidil solution. Another example is an electronic cigarette, where the atomized liquid stored in the electronic atomization device is tobacco oil.

[0030] The liquid storage chamber 10a is a liquid storage space in the liquid injection device for storing atomized liquid.

[0031] The liquid supply port 10b is a liquid outlet for the atomized liquid in the liquid storage chamber 10a to flow out.

[0032] The liquid injection port 21a is used to allow the atomized liquid from the liquid outlet to flow out of the liquid injection device so as to be replenished into the electronic atomization device.

[0033] The injection head 21 is covered at the liquid supply port 10b, which can facilitate the atomized liquid in the liquid storage chamber 10a to flow out of the injection device through the liquid supply port 10b and the injection port 21a. Thus, a liquid outlet path for the atomized liquid to flow from the liquid supply port 10b to the injection port 21a can be formed.

[0034] The one-way valve 22 is disposed between the injection head 21 and the liquid supply port 10b. In practice, the one-way valve 22 is located on the liquid outlet path. Opening the one-way valve 22 allows communication between the liquid supply port 10b and the injection port 21a, allowing the atomized liquid to flow from the liquid supply port 10b to the injection port 21a and out of the injection device from the injection port 21a. Closing the one-way valve 22 separates the injection head 21 and the liquid supply port 10b, preventing the atomized liquid from flowing from the liquid supply port 10b to the injection port 21a. Thus, opening and closing the one-way valve 22 allows switching between opening and closing the liquid outlet path.

[0035] It is understandable that when the one-way valve 22 opens the liquid outlet path, the one-way valve 22 can only allow the atomized liquid to flow from the liquid supply port 10b to the liquid injection port 21a in one direction, but cannot allow the atomized liquid to flow from the liquid injection port 21a to the liquid supply port 10b.

[0036] The specific material type of the one-way valve 22 is not limited. For example, the material of the one-way valve 22 is one of silicone and rubber. In this way, the one-way valve 22 can have a good sealing effect and elastic deformation ability.

[0037] For another example, the material hardness of the one-way valve 22 is greater than or equal to 40 Shore A and less than or equal to 80 Shore A. For example, 40 Shore A, 60 Shore A, and 80 Shore A. Therefore, using the above-mentioned material hardness for the one-way valve 22 can provide the one-way valve 22 with better structural strength and improved wear resistance.

[0038] The liquid injection device of the embodiment of the present application includes a shell assembly 10 and a liquid injection assembly 20. The shell assembly 10 has a liquid storage chamber 10a and a liquid supply port 10b, and the liquid storage chamber 10a is connected to the liquid supply port 10b. The liquid injection assembly 20 includes a liquid injection head 21 and a one-way valve 22. The liquid injection head 21 has a liquid injection port 21a, and the liquid injection head 21 is covered at one end of the shell assembly 10 having the liquid supply port 10b, so that a liquid outlet path is formed between the liquid supply port 10b and the liquid injection port 21a. The one-way valve 22 is provided between the liquid injection head 21 and the liquid supply port 10b to switch between opening and closing the liquid outlet path. Thus, by providing the one-way valve 22, in the process of the liquid injection device injecting liquid into the electronic atomization device, the one-way valve 22 can open the liquid outlet path, so that the atomized liquid in the liquid storage chamber 10a flows out along the liquid outlet path to replenish the atomized liquid into the electronic atomization device. At the same time, after the injection is completed, the one-way valve 22 can cut off the liquid outlet path to prevent the atomized liquid in the liquid storage chamber 10a from flowing out from the liquid supply port 10b and the injection port 21a, thereby reducing the risk of leakage and preventing the atomized liquid in the liquid storage chamber 10a from being exposed, thereby preventing the problem of solution waste and pollution.

[0039] Moreover, the injection device of the present application can greatly reduce the risk of liquid leakage by providing a one-way valve 22. At the same time, the one-way valve 22 will not have a significant impact on the injection effect of the injection device. Its simple structure makes the cost of the injection device low.

[0040] In one embodiment, please refer to Figure 1 、 Figure 2 and Figure 4 The one-way valve 22 is arranged at the liquid supply port 10b. The one-way valve 22 has a valve port 22a which is respectively connected to the liquid supply port 10b and the liquid injection port 21a. The valve port 22a is located on the liquid outlet path. Under the action of external force, the one-way valve 22 switches the valve port 22a between open and closed to switch between conducting and cutting off the liquid outlet path.

[0041] Specifically, the one-way valve 22 opens the valve port 22a to connect the liquid supply port 10b with the liquid injection port 21a, thereby opening the liquid outlet path. At the same time, the one-way valve 22 closes the valve port 22a to separate the liquid supply port 10b from the liquid injection port 21a, thereby blocking the liquid outlet path.

[0042] Thus, the valve port 22a of the one-way valve 22 can be opened and closed, thereby improving the anti-leakage effect of the liquid injection device and simultaneously not affecting the liquid injection process of the liquid injection device.

[0043] In one embodiment, please refer to Figure 4 The one-way valve 22 includes a valve body 221 and a valve nozzle 222. The valve body 221 covers the liquid supply port 10b, and the valve nozzle 222 is located at the end of the valve body 221 near the liquid inlet 21a. The valve nozzle 222 includes a first abutment portion 223 and a second abutment portion 224 provided on the valve body 221. At the end of the valve nozzle 222 near the liquid inlet 21a, at least portions of the first abutment portion 223 and the second abutment portion 224 are disconnected and abutted against each other, forming a closed valve port 22a. When the housing assembly 10 is squeezed by an external force, the pressure difference between the inside and outside of the liquid storage chamber 10a causes the disconnected portion of the first abutment portion 223 and the second abutment portion 224 to separate, thereby opening the valve port 22a. This significantly simplifies the structure of the one-way valve 22 while ensuring that the one-way valve 22 both opens and closes the liquid outlet path.

[0044] Specifically, the valve nozzle 222 has a valve opening 22a. At the valve opening 22a, the first abutment portion 223 and the second abutment portion 224 are not continuously connected, but rather disconnected. Furthermore, when the user is not squeezing the housing assembly 10, the first abutment portion 223 and the second abutment portion 224 abut against each other, thereby closing the valve opening 22a and blocking the liquid outflow path.

[0045] When the user applies pressure to the housing assembly 10, the liquid storage chamber 10a of the housing assembly 10 is compressed, and the pressure inside the liquid storage chamber 10a is greater than the pressure outside the liquid storage chamber 10a, causing the first and second fitting portions 223 and 224 to separate from each other, and the valve port 22a switches from a closed state to an open state. The atomized liquid in the liquid storage chamber 10a can also flow from the liquid storage chamber 10a to the liquid injection port 21a under the action of the air pressure difference, and then flow out of the liquid injection device.

[0046] It should be noted that the specific structure of the one-way valve 22 can be set according to actual conditions.

[0047] For example, see Figure 4 The cross-sectional dimensions of the valve body 221 gradually decrease from the end facing away from the liquid injection port 21a to the end near the liquid injection port 21a. In other words, the outer dimensions of the valve body 221 gradually decrease as it approaches the liquid injection port 21a. This allows the space within the valve body 221 for the atomized liquid to flow to gradually decrease, thereby directing the atomized liquid toward the liquid injection port 21a, thereby facilitating its outflow from the liquid injection port 21a.

[0048] For another example, the cross-sectional dimensions of the valve nozzle 222 gradually decrease from the end facing away from the liquid injection port 21a to the end near the liquid injection port 21a. Thus, the outer dimensions of the valve nozzle 222 can be gradually reduced toward the liquid injection port 21a, further guiding the atomized liquid toward the liquid injection port 21a.

[0049] In one embodiment, please refer to Figure 4 The first fitting portion 223 and the second fitting portion 224 are both inclined surfaces, and from the end away from the liquid injection port 21a to the end close to the liquid injection port 21a, the first fitting portion 223 and the second fitting portion 224 are inclined in a direction approaching each other.

[0050] Specifically, by configuring the first and second fitting portions 223, 224 as inclined surfaces, the distance between the first and second fitting portions 223, 224 can be gradually reduced from the end facing away from the liquid injection port 21a to the end facing the liquid injection port 21a until the two fit together. Thus, after the external force is removed, the valve openings 22a can be brought into contact with each other, thereby closing the valve openings 22a. Furthermore, because the first and second fitting portions 223, 224 are inclined surfaces that are inclined toward each other, they can guide the atomized liquid toward the liquid injection port 21a.

[0051] In one embodiment, please refer to Figure 4 The valve body 221 has air holes 221a, which are in communication with the liquid storage chamber 10a and the outside world, respectively, so as to form a ventilation path between the outside world and the liquid storage chamber 10a through the air holes 221a. This facilitates external airflow to enter the liquid storage chamber 10a through the air holes 221a, thereby replenishing air in the liquid storage chamber 10a, thereby facilitating subsequent liquid injection by the liquid injection device.

[0052] Specifically, the ventilation path is an airflow path for external air to flow into the liquid storage chamber 10a.

[0053] When a user applies a squeeze force to the housing assembly 10, the one-way valve 22 opens the liquid outlet path, allowing the atomized liquid in the liquid storage chamber 10a to flow from the liquid storage chamber 10a to the liquid injection port 21a and out of the liquid injection device. At this time, because the valve port 22a is located at the end of the valve nozzle 222 near the liquid injection port 21a, and the air hole 221a is located on the valve body 221, the atomized liquid will pass through the one-way valve 22 from the location where it is most likely to flow out, that is, more atomized liquid will pass through the valve port 22a.

[0054] Therefore, most of the atomized liquid can flow to the liquid injection port 21a through the valve port 22a, and only a small part of the atomized liquid can flow to the liquid injection port 21a through the air hole 221a. Alternatively, all of the atomized liquid can flow to the liquid injection port 21a through the valve port 22a, and no atomized liquid can flow to the liquid injection port 21a through the air hole 221a.

[0055] When the user cancels the squeezing force applied to the shell assembly 10, the shell assembly 10 returns to its initial state through elasticity, and gas needs to be replenished from the outside to enter the liquid storage chamber 10a. However, since the squeezing force applied to the shell assembly 10 is canceled, the separation between the first fitting portion 223 and the second fitting portion 224 is reclosed, and external gas cannot be replenished into the liquid storage chamber 10a through the valve port 22a. Therefore, by providing the air hole 221a, external gas can flow along the ventilation path, thereby entering the liquid storage chamber 10a through the air hole 221a, so that the shell assembly 10 can be restored to its initial state. As a result, it is convenient for the user to squeeze the shell assembly 10 again, and the process of re-injecting the liquid by the liquid injection device can be realized.

[0056] In one embodiment, please refer to Figure 2 and Figure 3 The side wall of the liquid supply port 10b protrudes outward from the liquid storage cavity 10a to form a connecting boss 11. The liquid injection head 21 has a mounting cavity 21b connected to the liquid injection port 21a. The one-way valve 22 is arranged in the mounting cavity 21b. The liquid injection head 21 cover is arranged on the connecting boss 11, and the connecting boss 11 extends into the mounting cavity 21b so that the one-way valve 22 is squeezed and fixed at the liquid supply port 10b.

[0057] Specifically, by forming the connecting boss 11, it is possible to facilitate the connection of the liquid injection head 21 and the one-way valve 22 to the housing assembly 10. By covering the liquid injection head 21 on the connecting boss 11, the one-way valve 22 can be pressed against the liquid supply port 10b, thereby improving the installation stability of the one-way valve 22 and reducing the risk of leakage of the atomized liquid from the liquid supply port 10b.

[0058] It should be noted that the liquid injection head 21 and the connecting boss 11 can be connected in a non-detachable manner. Of course, a detachable connection can also be adopted, thereby facilitating the mutual disassembly of the liquid injection head 21 and the connecting boss 11 so as to facilitate the maintenance and replacement of the one-way valve 22.

[0059] For example, an internal thread is formed on the inner wall of the installation cavity 21 b , and an external thread is formed on the outer wall of the connecting boss 11 , thereby enabling the liquid injection head 21 and the connecting boss 11 to be threadedly connected.

[0060] Of course, the liquid injection head 21 and the connecting boss 11 can also be connected in a detachable manner by snapping, plugging or other detachable connection methods.

[0061] In one embodiment, please refer to Figure 3 and Figure 4 The connecting boss 11 includes a connecting end surface 11a close to the liquid injection port 21a. The one-way valve 22 is formed with a flange 225 at one end close to the connecting boss 11. The flange 225 is in contact with the connecting end surface 11a.

[0062] Specifically, the end surface of the one-way valve 22 near the connecting boss 11 extends radially outward to form a flange 225 that is folded relative to the outer peripheral surface of the one-way valve 22. The formation of the flange 225 can facilitate the fit of the one-way valve 22 to the connecting end surface 11a, making the one-way valve 22 more stable under the pressure of the connecting boss 11 and the liquid injection head 21.

[0063] In one embodiment, please refer to Figure 3 The injection head 21 includes an injection body 211 and a sealing cap 212. The injection body 211 has an injection port 21a, and the sealing cap 212 is detachably mounted on the injection port 21a. Thus, the sealing cap 212 seals the injection port 21a, further reducing the risk of leakage of the injection device and improving the sealing performance of the injection device.

[0064] In one embodiment, the liquid injection device is used to replenish the atomized liquid into the electronic atomization device. The electronic atomization device includes an atomizer module and a host module. The atomizer module includes an atomizer body, a sealing component, a nozzle, and an airway. The atomizer body has a liquid storage chamber and a liquid inlet, and the liquid storage chamber is connected to the liquid inlet. The host module includes a power supply assembly and an air compressor. The air compressor is electrically connected to the power supply assembly. The air compressor is connected to one end of the airway, and the nozzle is connected to the other end of the airway and is connected to the liquid storage chamber, so that the airflow from the air compressor atomizes the atomized liquid from the liquid storage chamber to generate an aerosol. The air compressor is electrically connected to the power supply assembly, and the power supply assembly drives the air compressor to provide a high-speed airflow to the nozzle. The atomized liquid in the liquid storage chamber is transmitted to the nozzle and atomized under the action of the high-speed airflow provided by the air compressor to generate an aerosol.

[0065] The air compressor in the embodiment of the present application refers to a device that can compress gas, such as an air pump.

[0066] The injection port 21a of the injection device is connected to the liquid inlet. The user can squeeze the shell assembly 10 to allow the atomized liquid in the injection device to pass through the injection port 21a and the liquid inlet, and then be replenished into the liquid storage chamber of the electronic atomization device, thereby achieving liquid replenishment in the electronic atomization device.

[0067] In the description of this application, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in a specific embodiment", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine different embodiments or examples described in this application and features of different embodiments or examples without contradiction.

[0068] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application are intended to be within the scope of protection of the present application.

Claims

1. A liquid injection device, characterized in that: include: A housing assembly having a liquid storage cavity and a liquid supply port, wherein the liquid storage cavity is in communication with the liquid supply port; The liquid injection assembly includes a liquid injection head and a one-way valve. The liquid injection head has a liquid injection port, and the liquid injection head cover is arranged at one end of the shell assembly having the liquid supply port to form a liquid outlet path between the liquid supply port and the liquid injection port. The one-way valve is arranged between the liquid injection head and the liquid supply port to switch between opening and closing the liquid outlet path.

2. The liquid injection device according to claim 1, characterized in that The one-way valve is arranged at the liquid supply port, and has a valve port respectively connected to the liquid supply port and the liquid injection port. The valve port is located on the liquid outlet path. Under the action of external force, the one-way valve switches between opening and closing the valve port to switch between opening and closing the liquid outlet path.

3. The liquid injection device according to claim 2, characterized in that The one-way valve includes a valve body and a valve nozzle, the valve body cover is arranged at the liquid supply port, and the valve nozzle is located at one end of the valve body close to the liquid injection port. The valve nozzle includes a first fitting portion and a second fitting portion arranged on the valve body. At the end of the valve nozzle close to the liquid injection port, at least part of the first fitting portion and the second fitting portion are disconnected and fitted with each other to form a closed valve port. When the shell assembly is squeezed by external force, under the action of the air pressure difference between the inside and outside of the liquid storage chamber, the disconnected parts of the first fitting portion and the second fitting portion are separated from each other to open the valve port.

4. The liquid injection device according to claim 3, characterized in that The cross-sectional dimension of the valve body gradually decreases from the end away from the liquid injection port to the end close to the liquid injection port; and / or, The cross-sectional dimension of the valve nozzle gradually decreases from an end away from the liquid injection port to an end close to the liquid injection port.

5. The liquid injection device according to claim 3, characterized in that The first fitting portion and the second fitting portion are both inclined surfaces, and are inclined toward each other from an end away from the liquid injection port to an end close to the liquid injection port.

6. The liquid injection device according to claim 3, characterized in that The valve body has air holes, which are respectively connected to the liquid storage cavity and the outside world, so that an air exchange path flowing through the air holes is formed between the outside world and the liquid storage cavity.

7. The liquid injection device according to any one of claims 1 to 6, characterized in that: The side wall of the liquid supply port protrudes outward from the liquid storage cavity to form a connecting boss. The liquid injection head has a mounting cavity connected to the liquid injection port. The one-way valve is arranged in the mounting cavity. The liquid injection head cover is arranged on the connecting boss. The connecting boss extends into the mounting cavity so that the one-way valve is squeezed and fixed at the liquid supply port.

8. The liquid injection device according to claim 7, characterized in that: The connecting boss includes a connecting end surface close to the liquid injection port. The one-way valve is formed with a flange at one end close to the connecting boss, and the flange is in contact with the connecting end surface.

9. The liquid injection device according to any one of claims 1 to 6, characterized in that: The liquid injection head includes a liquid injection body and a sealing cover. The liquid injection body has the liquid injection port. The sealing cover is detachably mounted on the liquid injection port.

10. The liquid injection device according to any one of claims 1 to 6, characterized in that: The one-way valve is made of one of silicone and rubber; and / or The material hardness of the one-way valve is greater than or equal to Shore A40 and less than or equal to Shore A80.

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