Liquid injection device

Abstract

The utility model discloses a liquid injection device. The liquid injection device comprises a seat body and a liquid injection piece; the liquid injection part is arranged in the seat body, the liquid injection part is provided with a liquid injection position and a liquid return position, and in the process that the liquid injection part moves from the liquid injection position to the liquid return position, a liquid storage space formed by the liquid injection part and the seat body is gradually increased so that liquid can be sucked back. Therefore, the liquid injection part and the seat body form the liquid storage space, and the liquid storage space is gradually enlarged in the process that the liquid injection part moves from the liquid injection position to the liquid return position, so that the liquid injection device forms negative pressure in the liquid storage space, the liquid storage space can suck the electrolyte in the liquid injection cavity back to the liquid storage space, the electrolyte in the liquid injection cavity is prevented from dripping, and the liquid injection efficiency is improved. And battery pollution is avoided.

Description

Technical Field

[0001] The utility model relates to the field of battery processing equipment, and particularly relates to a liquid injection device. Background Art

[0002] The existing liquid injection device includes a liquid injection member and a liquid injection rubber pad. The liquid injection member abuts against the outer surface of the battery through the liquid injection rubber pad, and the liquid injection cavity of the liquid injection member communicates with the liquid inlet hole of the battery, so as to inject electrolyte into the battery.

[0003] In this way, after the liquid injection is completed, it is necessary to move the liquid injection rubber pad and the liquid injection member away from the battery. At this time, the remaining electrolyte in the liquid injection member and the liquid injection rubber pad drips, thereby contaminating the battery.

[0004] Therefore, the utility model provides a liquid injection device to at least partially solve the above problems. Summary of the Utility Model

[0005] A series of simplified concepts are introduced in the summary of the utility model, which will be further described in detail in the specific embodiment part. The summary of the utility model does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above technical problems, the utility model provides a liquid injection device, which includes:

[0007] A base body;

[0008] A liquid injection member, which is arranged in the base body. The liquid injection member has a liquid injection position and a liquid return position. During the process of the liquid injection member moving from the liquid injection position towards the liquid return position, the liquid storage space formed by the liquid injection member and the base body gradually increases, so as to be able to suck back the liquid.

[0009] According to the liquid injection device of the utility model, the liquid injection member and the base body form a liquid storage space. During the process of the liquid injection member moving from the liquid injection position to the liquid return position, the liquid storage space gradually increases. In this way, a negative pressure is formed in the liquid storage space of the liquid injection device. Thus, the liquid storage space can suck back the electrolyte located in the liquid injection cavity to the liquid storage space, avoiding the dripping of the electrolyte located in the liquid injection cavity, and further avoiding contaminating the battery.

[0010] Optionally, the base body has a base body cavity;

[0011] The liquid injection member has a liquid injection cavity and a liquid injection port located at one end of the liquid injection member along the setting direction. The liquid injection port communicates with the liquid injection cavity. The liquid injection member is arranged in the base body cavity, so that the end surface of the liquid injection member away from the liquid injection port along the setting direction and the base body cavity form a liquid storage space.

[0012] Optionally, the liquid injection member has a liquid inlet, the liquid inlet communicates with the liquid injection cavity, and the liquid storage space communicates with the liquid inlet.

[0013] Optionally, the liquid injection device further includes a seal, which is located between the liquid injection member and the seat body to seal the gap between the liquid injection member and the seat body.

[0014] Optionally, the liquid injection device further includes a reset elastic member, which is connected to the seat body and the liquid injection member to apply a force to the liquid injection member to move the liquid injection member towards the liquid return position.

[0015] Optionally, the liquid injection device further includes a mounting assembly, which is located on the outer peripheral side of the liquid injection member and connected to the liquid injection member. The reset elastic member is sleeved on the outer periphery of the liquid injection member and connected to the mounting assembly.

[0016] Optionally, the mounting assembly has a protruding portion protruding radially outwards, and the reset elastic member is located between the protruding portion and the seat body.

[0017] Optionally, the protruding portion is configured as an annular flange.

[0018] Optionally, the liquid injection cavity penetrates the liquid injection member along the setting direction.

[0019] Optionally, along the setting direction, there is a gap between one end of the liquid injection member and the seat body cavity away from the liquid injection port.

[0020] Optionally, the seat body cavity penetrates the seat body along the setting direction.

[0021] Optionally, the setting direction extends along the vertical direction.

[0022] Optionally, the liquid injection port is located below the liquid inlet.

[0023] Optionally, the liquid injection device further includes a mounting ferrule, which is sleeved on the seat body and the liquid injection member to form a receiving space. The mounting assembly and the reset elastic member are both located in the receiving space, and / or

[0024] The liquid injection member has a liquid injection port for liquid injection. The liquid injection device further includes a liquid injection rubber pad, which has a liquid injection hole. The liquid injection rubber pad is connected to the liquid injection member, and the liquid injection hole communicates with the liquid injection port. Description of the Drawings

[0025] In order to make the advantages of the present utility model easier to understand, the present utility model briefly described above will be described in more detail by referring to the specific embodiments shown in the drawings. It can be understood that these drawings only depict typical embodiments of the present utility model, and thus should not be considered as limiting its protection scope. The present utility model is described and explained with additional features and details through the drawings.

[0026] Figure 1Schematic cross-sectional view of the front view of the liquid injection device according to a preferred embodiment of the present utility model, where the liquid injection member is in the liquid injection position; and

[0027] Figure 2 is Figure 1 Schematic cross-sectional view of the front view of the liquid injection device, where the liquid injection member is in the liquid return position.

[0028] Description of the reference numerals

[0029] 110: Seat body 111: Seat body cavity

[0030] 120: Liquid injection member 121: Liquid injection cavity

[0031] 122: Liquid inlet 123: Liquid injection port

[0032] 130: Liquid storage space 140: Return elastic member

[0033] 150: Mounting assembly 151: Mounting member

[0034] 152: Mounting body 153: Protrusion

[0035] 154: Mounting snap ring 160: Mounting sleeve

[0036] 161: Accommodating space 170: Liquid injection rubber pad

[0037] 171: Liquid injection hole 180: Sealing member

[0038] 190: End face 191: Connection groove

[0039] 192: Connection protrusion 193: First section

[0040] 194: Second section 195: First section

[0041] 196: Second section 197: Sleeve positioning step

[0042] 198: Mounting interval Detailed implementation manners

[0043] In the following description, a large number of specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the embodiments of the present utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the embodiments of the present utility model, some well-known technical features in the art are not described.

[0044] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower" and similar expressions used herein are for illustrative purposes only and are not limiting.

[0045] In this text, the ordinal numbers such as "first" and "second" cited in the present utility model are only identifiers and do not have any other meanings, such as a specific order, etc.

[0046] In order to thoroughly understand the embodiments of the present utility model, detailed structures will be presented in the following description. Obviously, the implementation of the embodiments of the present utility model is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present utility model are described in detail below. However, in addition to these detailed descriptions, the present utility model may also have other embodiments.

[0047] This embodiment provides a liquid injection device. The liquid injection device is used to inject electrolyte into the battery (liquid injection). After the liquid injection is completed, the liquid injection device can suck back the electrolyte remaining in the liquid injection member 120 to avoid the dripping of the electrolyte, thereby avoiding the contamination of the battery.

[0048] Please refer to Figure 1 and Figure 2 , the liquid injection device includes a base body 110. The base body 110 is a columnar structure. The axial direction of the base body 110 is parallel to the setting direction D. The base body 110 has a base body cavity 111. The cross-sectional shape (this cross-section is perpendicular to the setting direction D) of the base body cavity 111 can be circular. The axial direction of the base body cavity 111 is parallel to the setting direction D.

[0049] Optionally, the base body cavity 111 and the base body 110 are coaxially arranged. Thus, the structure of the base body 110 is simple.

[0050] As Figure 1 and Figure 2 shown, the liquid injection device further includes a liquid injection member 120. The liquid injection member 120 is arranged inside the base body 110. Along the setting direction D, the liquid injection member 120 can move. In this way, the liquid injection member 120 has an injection position (the position of the liquid injection member 120 shown in Figure 1 ) and a liquid return position (the position of the liquid injection member 120 shown in Figure 2 ). When the liquid injection member 120 is in the injection position, the liquid injection member 120 is used for liquid injection. During the process of the liquid injection member 120 moving from the injection position towards the liquid return position, the liquid storage space 130 formed by the liquid injection member 120 and the base body 110 gradually increases to be able to suck back the liquid (electrolyte).

[0051] Specifically, the liquid injection member 120 has a cylindrical structure. The axial direction of the liquid injection member 120 is parallel to the setting direction D. The liquid injection member 120 has a liquid injection cavity 121, a liquid inlet 122, and a liquid injection port 123. Both the liquid inlet 122 and the liquid injection port 123 communicate with the liquid injection cavity 121. The cross-sectional shape of the liquid injection cavity 121 (the cross-section is perpendicular to the setting direction D) can be circular. The liquid injection cavity 121 and the liquid injection member 120 are coaxially arranged. Thus, the structure of the liquid injection member 120 is simple.

[0052] The liquid injection port 123 is located at one end of the liquid injection member 120 along the setting direction D. The liquid injection member 120 is movably arranged in the seat body cavity 111 along the setting direction D. Along the setting direction D, the liquid injection member 120 extends out of the seat body 110. In this way, the end face 190 of the liquid injection member 120 away from the liquid injection port 123 along the setting direction D and the seat body cavity 111 form a liquid storage space 130. The liquid storage space 130 communicates with the liquid injection cavity 121. In this way, the volume of the liquid storage space 130 formed by the end face 190 and the seat body cavity 111 is large.

[0053] Furthermore, the liquid storage space 130 communicates with the liquid inlet 122. In this way, the liquid storage space 130 communicates with the liquid injection cavity 121 through the liquid inlet 122. There is no need to set other channels to make the liquid storage space 130 communicate with the liquid injection cavity 121. Thus, the structure of the liquid injection member 120 is simple.

[0054] It can be understood that in an embodiment not shown, the end face of the liquid injection member at the liquid injection position is flush with the end face of the seat body away from the liquid injection port, and the outer peripheral surface of the liquid injection member and the inner wall surface of the seat body cavity form a liquid storage space. The liquid storage space is a circumferentially closed annular structure.

[0055] Along the setting direction D, the end of the liquid injection member 120 provided with the liquid injection port 123 is located outside the seat body 110. Along the setting direction D, the dimension of the part of the liquid injection member 120 located outside the seat body 110 is the protruding dimension. The protruding dimension of the liquid injection member 120 at the liquid injection position is smaller than the protruding dimension of the liquid injection member 120 at the liquid return position. In this way, since the dimension of the liquid injection member 120 along the setting direction D is fixed. Therefore, during the process of the liquid injection member 120 moving from the liquid injection position to the liquid return position, the liquid storage space 130 gradually increases.

[0056] Please return Figure 1 and Figure 2 , in the case of no liquid injection, the liquid injection member 120 is located at Figure 2The liquid return position. At this time, both the liquid injection member 120 and the liquid injection rubber pad 170 described later leave the battery. When liquid injection is required, the seat body 110 is moved along the first setting direction D1 (downward), so that one end of the liquid injection rubber pad 170 described later along the setting direction D away from the liquid inlet 122 presses against the outer surface of the battery, and the liquid injection hole 171 of the liquid injection rubber pad 170 communicates with the liquid inlet hole of the battery. The seat body 110 is continuously moved along the first setting direction D1, so that the liquid injection member 120 moves relative to the seat body 110 from the liquid return position to the liquid injection position (upward) along the second setting direction D2. The first setting direction D1 and the second setting direction D2 are both parallel to the setting direction D. The first setting direction D1 and the second setting direction D2 are opposite.

[0057] When the liquid injection member 120 is in the liquid injection position, electrolyte can be injected into one end of the seat body cavity 111 away from the liquid injection port 123, so that the electrolyte passes through the seat body cavity 111, the liquid injection port 123 and the liquid injection cavity 121 in sequence, and then flows out of the liquid injection member 120 through the liquid injection port 123 and is injected into the battery. During the liquid injection process, the liquid storage space 130, the liquid injection cavity 121, and the liquid injection holes 171 of the liquid injection rubber pad 170 described later are filled with electrolyte.

[0058] After the liquid injection is completed, the seat body 110 is moved along the second setting direction D2 (upward) so that the liquid injection member 120 moves away from the liquid injection position along the first setting direction D1 (downward). When the liquid injection member 120 leaves the liquid injection position, the liquid injection port 123 communicates with the atmosphere.

[0059] Please continue to refer to Figure 1 and Figure 2 When the liquid injection member 120 moves from the liquid injection position to the liquid return position, the liquid storage space 130 gradually increases. In this way, a negative pressure is formed in the liquid storage space 130 of the liquid injection device. Thus, the liquid storage space 130 can suck back the electrolyte in the liquid injection cavity 121 and the liquid injection holes 171 of the liquid injection rubber pad 170 described later into the liquid storage space 130, avoiding the electrolyte in the liquid injection cavity 121 and the liquid injection holes 171 of the liquid injection rubber pad 170 described later from dripping through the liquid injection holes 171 and further polluting the battery.

[0060] In addition, since the liquid storage space 130 communicates with the liquid injection cavity 121 when the liquid injection member 120 is in the liquid return position, other pipelines can be inserted into the liquid storage space 130 to suck away the electrolyte in the liquid storage space 130.

[0061] In this embodiment, the liquid injection member 120 and the base body 110 form a liquid storage space 130. During the process of the liquid injection member 120 moving from the liquid injection position to the liquid return position, the liquid storage space 130 gradually increases. In this way, a negative pressure is formed in the liquid storage space 130 by the liquid injection device. Thus, the liquid storage space 130 can suck back the electrolyte located in the liquid injection member 120 and in the liquid injection holes 171 of the liquid injection gasket 170 described later into the liquid storage space 130, avoiding the dripping of the electrolyte located in the liquid injection cavity 121, and further avoiding the contamination of the battery.

[0062] Optionally, as Figure 1 and Figure 2 shown, the liquid injection cavity 121 penetrates through the liquid injection member 120 along the setting direction D. Thus, the structure of the liquid injection member 120 is simple and convenient for processing. In addition, after the liquid injection is completed, it is convenient to clean the electrolyte accumulated in the liquid injection cavity 121.

[0063] As Figure 1 and Figure 2 shown, optionally, along the setting direction D, there is a gap between one end of the liquid injection member 120 and the seat body cavity 111 away from the liquid injection port 123. In this way, no matter where the liquid injection member 120 is located, a liquid storage space 130 is formed at this gap. Thus, there is no need to provide an additional installation hole in the seat body 110. The installation hole communicates with the seat body cavity and is used to connect the pipeline for inputting the electrolyte into the seat body cavity. The structure of the liquid injection member 120 is simple.

[0064] As Figure 1 and Figure 2 shown, the seat body cavity 111 penetrates through the seat body 110 along the setting direction D. Thus, it is convenient for the processing of the seat body 110. In addition, due to the fact that the seat body cavity 111 penetrates through the seat body 110 along the setting direction D, the seat body cavity 111 is open. After the liquid injection is completed, it is convenient to clean the electrolyte accumulated in the seat body cavity 111.

[0065] After the liquid injection is completed, the electrolyte accumulated in the seat body cavity 111 and the liquid injection cavity 121 can be cleaned up, avoiding the formation of a mixture by the electrolyte and air accumulated in the seat body cavity 111 and the liquid injection cavity 121, and further avoiding the injection of this mixture into the battery during the next liquid injection.

[0066] Optionally, the seat body cavity 111 includes a first section 193 and a second section 194. The first section 193 communicates with the second section 194. The inner diameter dimension of the first section 193 is larger than that of the second section 194. The second section 194 is closer to the liquid injection port 123 than the first section 193. The liquid injection member 120 is located in the second section 194. Thus, it is convenient to clean the electrolyte accumulated in the seat body cavity 111 and the liquid injection cavity 121 through the first section 193.

[0067] Optionally, the liquid injection cavity 121 includes a third section 195 and a fourth section 196. The third section 195 communicates with the fourth section 196. The inner diameter of the third section 195 is larger than that of the fourth section 196. A liquid injection port 123 is provided at one end of the fourth section 196 away from the third section 195. One end of the third section 195 away from the fourth section 196 communicates with the seat body cavity 111. Thus, it is convenient to clean the accumulated electrolyte in the liquid injection cavity 121 through the third section 195.

[0068] It can be understood that in an embodiment not shown, one end of the part of the seat body forming the seat body cavity away from the liquid injection port is a closed structure. At this time, the seat body has a hole communicating with the seat body cavity for injecting electrolyte into the seat body cavity.

[0069] Optionally, as Figure 1 and Figure 2 shown, the setting direction D extends in the vertical direction. In this way, moving the main body up and down can move the liquid injection member 120 between the liquid injection position and the liquid return position. Thus, the horizontal occupied space of the liquid injection device is small, which is convenient for arranging the production line adopting the liquid injection device.

[0070] In an embodiment not shown, the setting direction D intersects with the vertical direction. For example, the setting direction is parallel to the horizontal direction, or the setting direction forms an angle with the vertical direction.

[0071] Further, the liquid injection port 123 is located below the liquid inlet 122. Thus, when injecting liquid, the electrolyte flows downward, which is convenient for liquid injection.

[0072] In an embodiment not shown, the liquid injection port is located above the liquid inlet.

[0073] Optionally, as Figure 1 and Figure 2 shown, a mounting groove is formed by radially inwardly recessing the outer peripheral surface of the liquid injection member 120. The liquid injection device further includes a sealing member 180. The sealing member 180 can be an annular sealing ring. The sealing member 180 is sleeved in the mounting groove. In this way, the sealing member 180 is located between the liquid injection member 120 and the seat body 110. The sealing member 180 abuts against the inner wall surfaces of the liquid injection member 120 and the seat body cavity 111 to seal the gap between the liquid injection member 120 and the seat body 110. Thus, liquid leakage can be avoided, and further a negative pressure can be formed more effectively.

[0074] Further, there are multiple (for example, two) sealing members 180. The liquid injection member 120 has multiple (for example, two) mounting grooves. The multiple mounting grooves and the multiple sealing members 180 correspond to each other one by one. The sealing members 180 are arranged in the corresponding mounting grooves. Thus, the sealing performance between the liquid injection member 120 and the seat body 110 can be further increased.

[0075] As Figure 1 and Figure 2As shown, optionally, the liquid injection device further includes a reset elastic member 140. The reset elastic member 140 is connected to the seat body 110 and the liquid injection member 120 to apply a force to the liquid injection member 120 to move the liquid injection member 120 toward the liquid return position. In this way, after the liquid injection is completed, when the liquid injection member 120 moves away from the outer surface of the battery along the set direction, the liquid injection member 120 at the liquid injection position automatically returns to the liquid return position, and thus the liquid automatically returns.

[0076] It can be understood that in an embodiment not shown, other driving components (such as a cylinder) can also be provided to drive the liquid injection member to move between the liquid injection position and the liquid return position.

[0077] As Figure 1 As shown, the liquid injection device further includes a mounting assembly 150. The mounting assembly 150 is located on the outer peripheral side of the liquid injection member 120 and is connected to the liquid injection member 120. The reset elastic member 140 is sleeved on the outer periphery of the liquid injection member 120 and is connected to the mounting assembly 150. Thus, the reset elastic member 140 is connected to the mounting assembly 150. By connecting the mounting assembly 150 to the liquid injection member 120, the installation of the reset elastic member 140 can be completed, which is convenient for the installation of the reset elastic member 140.

[0078] Further, the mounting assembly 150 has a protruding portion 153 protruding radially outward. The reset elastic member 140 is sleeved on the outer periphery of the liquid injection member 120 and is located between the protruding portion 153 and the seat body 110.

[0079] Specifically, the mounting assembly 150 includes a mounting member 151 and a mounting circlip 154. The mounting member 151 includes a mounting body 152 and a protruding portion 153. The protruding portion 153 is formed by extending and protruding radially outward along the mounting body 152. The mounting body 152 is sleeved on the outer periphery of the liquid injection member 120. The mounting body 152 is fixedly connected to the liquid injection member 120 through the mounting circlip 154. The reset elastic member 140 can be a cylindrical spring. The reset elastic member 140 is sleeved on the mounting body 152. Along the set direction D, the reset elastic member 140 is located between the protruding portion 153 and the seat body 110. When the liquid injection member 120 is in the liquid return position, the reset elastic member 140 is in a compressed state to be able to apply a force to the protruding portion 153, so that the mounting assembly 150 drives the liquid injection member 120 to move toward the liquid return position. During the process of the liquid injection member 120 moving from the liquid return position toward the liquid injection position, the reset elastic member 140 is further compressed. Thus, by sleeving the reset elastic member 140 on the mounting body 152 and connecting the mounting member 151 to the liquid injection member 120, the installation of the reset elastic member 140 can be completed, which is more convenient for the installation of the reset elastic member 140.

[0080] Further, the protruding portion 153 is configured as an annular flange. Thus, the strength of the mounting member 151 is high. In addition, the reset elastic member 140 is supported more stably.

[0081] like Figure 1 and Figure 2 As shown, optionally, the liquid injection device further includes a liquid injection pad 170. The liquid injection pad 170 is a rubber pad. The liquid injection pad 170 has a liquid injection hole 171. The end of the liquid injection piece 120 away from the liquid inlet 122 extends out of the base 110. The liquid injection pad 170 is snap-connected to the end of the liquid injection piece 120 away from the liquid inlet 122. The liquid injection hole 171 is connected to the liquid injection port 123. Therefore, when liquid is injected, the liquid injection pad 170 is located between the liquid injection piece 120 and the battery, and can seal the gap between the battery and the liquid injection piece 120. In addition, it can avoid scratching the outer surface of the battery.

[0082] Optionally, the inner surface of the injection hole 171 of the injection pad 170 is radially recessed outward to form a connecting groove 191. The outer surface of the injection piece 120 protrudes radially outward to form a connecting protrusion 192. The connecting protrusion 192 extends into the connecting groove 191. Thus, the connection between the injection pad 170 and the injection piece 120 is secure.

[0083] Furthermore, the connecting groove 191 is constructed as an annular groove, while the connecting protrusion 192 is constructed as an annular structure. This eliminates the need to align the connecting protrusion 192 and the connecting groove 191 when connecting the liquid injection pad 170 to the liquid injection piece 120, facilitating installation of the liquid injection pad 170 to the liquid injection piece 120. Furthermore, the large contact area between the connecting protrusion 192 and the connecting groove 191 further enhances the strength of the liquid injection pad 170 and the liquid injection piece 120.

[0084] Optionally, the inner diameter of the inner surface of the injection hole 171 of the injection rubber pad 170 is larger than the outer diameter of the injection piece 120 where it connects to the injection rubber pad 170, so that there is an installation gap 198 between the inner surface of the injection hole 171 and the outer peripheral surface of the injection piece 120 where it connects to the injection rubber pad 170. This facilitates the installation of the connecting protrusion 192 extending into the connecting groove 191.

[0085] The liquid injection device also includes a mounting sleeve 160. The mounting sleeve 160 is a sleeve-shaped structure. One end of the mounting sleeve 160 is sleeved on the base body 110 and connected to the outer periphery of the base body 110. The other end of the mounting sleeve 160 is a necked structure. The other end of the mounting sleeve 160 is sleeved on the connection position of the liquid injection part 120 and the liquid injection rubber pad 170. In this way, the internal space of the mounting sleeve 160, the liquid injection part 120, and the base body 110 form a receiving space 161. The mounting assembly 150 and the reset elastic member 140 are both located in the receiving space 161. In this way, the mounting assembly 150 and the reset elastic member 140 can be protected.

[0086] Furthermore, the mounting sleeve 160 is threadedly connected to the seat body 110. Thus, the mounting sleeve 160 is conveniently assembled and disassembled.

[0087] A ferrule positioning step 197 is provided on the outer peripheral surface of the base body 110. The end surface of the ferrule 160 away from the liquid injection rubber pad 170 abuts against the ferrule positioning step 197. Thus, when the base body 110 is installed on the ferrule 160, it is only necessary to tighten it so that the end surface of the ferrule 160 away from the liquid injection rubber pad 170 abuts against the ferrule positioning step 197, which is convenient for positioning the relative positions of the ferrule 160 and the liquid injection rubber pad 170.

[0088] The present utility model has been described through the above embodiments. However, it should be understood that the above embodiments are only for the purpose of illustration and example, and are not intended to limit the present utility model to the scope of the described embodiments. In addition, those skilled in the art can understand that the present utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present utility model, and these variations and modifications all fall within the scope of protection required by the present utility model. The scope of protection of the present utility model is defined by the appended claims and their equivalent scope.

[0089] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present utility model. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. Terms such as "component" as used herein can represent both a single part and a combination of multiple parts. Terms such as "installation" and "setting" as used herein can represent both a component being directly attached to another component and a component being attached to another component through an intermediate member. Features described in one embodiment herein can be applied alone or in combination with other features to another embodiment, unless the feature is not applicable or otherwise stated in that other embodiment.

Claims

1. A liquid injection device, characterized in that, The liquid injection device includes: A base body; A liquid injection member, which is arranged in the base body. The liquid injection member has a liquid injection position and a liquid return position. During the process of the liquid injection member moving from the liquid injection position towards the liquid return position, the liquid storage space formed by the liquid injection member and the base body gradually increases to be able to suck back liquid.

2. The liquid injection device according to claim 1, wherein The base body has a base body cavity; The liquid injection member has a liquid injection cavity and a liquid injection port located at one end of the liquid injection member along the setting direction. The liquid injection port communicates with the liquid injection cavity. The liquid injection member is arranged in the base body cavity so that the end face of the liquid injection member along the setting direction away from the liquid injection port and the base body cavity form the liquid storage space.

3. The liquid injection device according to claim 2, wherein, The liquid injection member has a liquid inlet, the liquid inlet communicates with the liquid injection cavity, and the liquid storage space communicates with the liquid inlet.

4. The liquid injection device according to claim 1, wherein The liquid injection device further includes a sealing member, which is located between the liquid injection member and the base body to seal the gap between the liquid injection member and the base body.

5. The liquid injection device according to claim 1, wherein The liquid injection device further includes a reset elastic member, which is connected to the base body and the liquid injection member to apply a force to the liquid injection member to make the liquid injection member move towards the liquid return position.

6. The liquid injection device according to claim 5, characterized in that, The liquid injection device further includes an installation assembly, which is located on the outer peripheral side of the liquid injection member and is connected to the liquid injection member. The reset elastic member is sleeved on the outer periphery of the liquid injection member and is connected to the installation assembly.

7. The liquid injection device according to claim 6, wherein The installation assembly has a convex portion protruding radially outwards, and the reset elastic member is located between the convex portion and the base body.

8. The liquid injection device according to claim 7, characterized in that The convex portion is configured as an annular flange.

9. The liquid injection device according to claim 3, wherein The liquid injection cavity penetrates through the liquid injection member along the setting direction.

10. The liquid injection device according to claim 2, characterized in that, Along the setting direction, there is a gap between the liquid injection member and one end of the base body cavity away from the liquid injection port.

11. The liquid injection device according to claim 2, characterized in that, The base body cavity penetrates through the base body along the setting direction.

12. The liquid injection device according to claim 3, wherein The setting direction extends along the vertical direction.

13. The liquid injection device according to claim 12, characterized in that, The liquid injection port is located below the liquid inlet.

14. The liquid injection device according to claim 6, wherein The liquid injection device further includes an installation ferrule, which is sleeved on the base body and the liquid injection member to form an accommodation space. The installation assembly and the reset elastic member are both located in the accommodation space, and / or The liquid injection member has a liquid injection port for liquid injection. The liquid injection device further includes a liquid injection rubber pad, which has a liquid injection hole. The liquid injection rubber pad is connected to the liquid injection member, and the liquid injection hole communicates with the liquid injection port.

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