Needle valve assembly for injecting electrolyte

Abstract

The utility model relates to the field of battery manufacturing, in particular to a needle valve assembly for injecting electrolyte. The needle valve assembly comprises a top cover, a cylinder barrel, a valve body, a valve rod and an electrolyte injection pipe, the top cover is in threaded connection with the top end of the cylinder barrel, a first air hole and a second air hole are formed in the cylinder barrel, the cylinder barrel and the valve body are connected through a screw, a threaded hole is formed in the valve body and used for installing a check valve, the valve body is arranged on the liquid injection pipe in a sleeving mode, and a valve element threaded sleeve is arranged at the connecting position of the liquid injection pipe and the liquid injection nozzle. The liquid injection pipe is in threaded connection with the valve element threaded sleeve, a piston is arranged in the cylinder barrel, a guide piece and a piston sealing ring are installed between the piston and the cylinder barrel, the piston and the valve rod are sleeved with a sealing seat, one end of the valve rod is in threaded connection with the piston, and the other end of the valve rod is connected with an ejector rod. And the liquid injection pipe is sleeved on the valve rod. The needle valve assembly solves the problems that a piston and a cylinder barrel of an existing needle valve assembly for injecting electrolyte are prone to eccentric wear, the service life is shortened, and the needle valve assembly is not easy to assemble.

Description

Technical Field

[0001] The utility model relates to the field of battery manufacturing, in particular to a needle valve assembly for injecting electrolyte. Background Art

[0002] The needle valve assembly for electrolyte injection is a key component specially designed for precise control of the electrolyte injection process. It is widely used in battery manufacturing, especially in the production of lithium-ion batteries and other types of electrochemical energy storage devices. In the manufacturing process of small electronic devices such as mobile phones, the injection of electrolyte is a very critical and delicate step, especially for those devices that use lithium-ion batteries as energy sources. The safety, performance and life of the battery depend largely on the accuracy and non-contamination of the electrolyte injection. Therefore, the needle valve assembly used for this process needs to have extremely high precision and sealing. Due to the small size of the needle valve assembly, advanced micromachining technology is required to ensure the dimensional accuracy and surface finish of the parts.

[0003] The coaxiality between the cylinder and the piston of the existing needle valve assembly for electrolyte injection cannot be guaranteed. When there is a deviation in the coaxiality between the piston and the cylinder, the contact surface between the piston and the cylinder will be uneven during movement, with some points receiving greater pressure and other points receiving less pressure. This uneven force distribution will lead to increased local wear and eccentric wear, which will reduce the service life of the needle valve assembly and fail to meet design expectations. In order to solve the above technical problems, the utility model designs a needle valve assembly for electrolyte injection. Utility Model Content

[0004] The utility model provides a needle valve assembly for electrolyte injection, aiming to solve the problems of easy eccentric wear between the piston and the cylinder of the existing needle valve assembly for electrolyte injection, resulting in reduced service life and difficulty in assembling the needle valve assembly. The technical solution is as follows:

[0005] A needle valve assembly for injecting electrolyte: comprises a top cover, a cylinder, a valve body, a valve stem and a liquid injection tube; the top cover is threadedly connected to the top end of the cylinder, a first air hole and a second air hole are provided on the cylinder, the cylinder and the valve body are connected by screws, a threaded hole is provided on the valve body, the threaded hole is used to install a check valve, the valve body is sleeved on the liquid injection tube, a threaded sleeve is sleeved on the valve body, a sealing member is arranged between the threaded sleeve and the liquid injection tube, the lower end of the liquid injection tube is connected to the liquid injection nozzle, a valve core threaded sleeve is arranged at the connection between the liquid injection tube and the liquid injection nozzle, the liquid injection tube and the valve core threaded sleeve are threadedly connected, a piston is arranged in the cylinder, a guide and a piston sealing ring are installed between the piston and the cylinder, a sealing seat is sleeved on the piston and the valve stem, one end of the valve stem is threadedly connected to the piston, and the other end is connected to the push rod; the liquid injection tube is sleeved on the valve stem.

[0006] Based on the above technical solution, the sealing seat includes an upper sealing seat and a lower sealing seat, a first sealing ring is arranged between the sealing seat and the piston, a second sealing ring is arranged between the upper sealing seat and the cylinder, a third sealing ring is arranged between the lower sealing seat and the valve stem, and a fourth sealing ring is arranged between the lower sealing seat and the valve body.

[0007] Preferably, a special-shaped support member is provided on the top rod.

[0008] Based on the above technical solution, the sealing member includes a first wedge-shaped member and a second wedge-shaped member, the first wedge-shaped member is arranged between the valve body and the liquid injection tube, and the second wedge-shaped member is arranged between the screw sleeve and the liquid injection tube.

[0009] Preferably, the guide member is a wear-resistant member, and the hardness of the guide member is greater than the hardness of the piston sealing ring.

[0010] Beneficial Effects

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the needle valve assembly adopts a split design, which reduces the difficulty of processing a single component. The split design provides the possibility of precise adjustment of key dimensions such as coaxiality and parallelism during the assembly process. When the components of the needle valve assembly are worn or need to be upgraded, only some parts need to be replaced, which greatly reduces maintenance costs and time.

[0012] The guide ensures that the piston always maintains precise alignment with the cylinder during movement, reducing the risk of eccentric wear and leakage, and improving the reliability and durability of the seal. By reducing unnecessary wear, the guide helps protect the piston and cylinder and extend the service life of the entire needle valve assembly. Sealing rings are set in multiple places to ensure sealing. During the electrolyte injection process, high sealing is a guarantee of safety and efficiency, which can effectively prevent electrolyte leakage, avoid environmental pollution and equipment damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the utility model. For ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0014] Figure 1 : A schematic diagram of the structure of the utility model;

[0015] Figure 2 : Figure 1 The enlarged view of point A in the middle;

[0016] Figure 3 : A schematic diagram of the structure of the sealing seat of the utility model;

[0017] Figure 4 : A side view of the utility model;

[0018] Figure 5 : Figure 4 Cross-sectional view at the middle BB.

[0019] Figure 6 : Figure 1 Enlarged view of point C in the middle;

[0020] Figure 7 : Figure 1 The enlarged view of point D in the middle; DETAILED DESCRIPTION

[0021] The utility model is further described below with reference to the accompanying drawings and examples:

[0022] The embodiments of the present invention are described in detail below, and 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore cannot be understood as a limitation on the present invention.

[0025] like Figure 1 and Figure 4As shown, a needle valve assembly for injecting electrolyte is characterized in that it includes a top cover 1, a cylinder 2, a valve body 3, a valve stem 6 and an injection tube 7; the top cover 1 is threadedly connected to the top of the cylinder 2, the cylinder 2 is provided with a first air hole 21 and a second air hole 22, the cylinder 2 and the valve body 3 are connected by screws, the valve body 3 is provided with a threaded hole 23, the threaded hole 23 is used to install a check valve, the valve body 3 is sleeved on the injection tube 7, the valve body 3 is sleeved with a threaded sleeve 61, the threaded sleeve 61 and A sealing member is arranged between the injection tube 7, the lower end of the injection tube 7 is connected to the injection nozzle 9, a valve core screw sleeve 71 is arranged at the connection between the injection tube 7 and the injection nozzle 9, the injection tube 7 and the valve core screw sleeve 71 are threadedly connected, a piston 4 is arranged in the cylinder 2, a guide member 41 and a piston sealing ring 42 are installed between the piston 4 and the cylinder 2, a sealing seat 5 is sleeved on the piston 4 and the valve stem 6, one end of the valve stem 6 is threadedly connected to the piston 4, and the other end is connected to the push rod 8; the injection tube 7 is sleeved on the valve stem 6. A top cover sealing ring 11 is arranged between the top cover 1 and the cylinder 2, and a guide member 41 is arranged on the piston 4, and the guide member 41 is a wear-resistant member. For example, nylon material or polytetrafluoroethylene. The piston sealing ring 42 is an elastic member. For example, rubber material.

[0026] The hardness of the guide member 41 is greater than that of the piston seal ring 42. The piston seal ring 42 and the guide member 41 have different hardnesses. This soft-hard combination design enables the guide member 41 to provide a restraining and guiding function, and the piston seal ring 42 to provide good sealing. On the one hand, the guide member 41 ensures the coaxiality of the piston 4 and the cylinder 2, and on the other hand, the guide member 41 supports the piston 4 to avoid excessive wear of the piston seal ring 42.

[0027] When the coaxiality of the piston 4 in the cylinder 2 deviates, the piston 4 will deviate to one end (one point), compressing one point of the piston seal ring 42, causing excessive wear of the piston seal ring 42, resulting in eccentric wear, further damaging the coaxiality. In order to avoid eccentric wear, a guide member 41 is provided. The guide member 41 corrects the compression amount of the piston seal ring 42 to avoid eccentric wear of the piston seal ring 42, and the guide member 41 also supports and guides the piston 4.

[0028] Furthermore, a guide ring 43 is provided between the piston 4 and the sealing seat 5, and the guide ring 43 is interference fit with the sealing seat 5 and has a clearance fit with the piston 4. The guide member 41 and the guide ring 43 both have guiding and restraining functions, and jointly ensure the coaxiality of the piston 4 and the cylinder 2.

[0029] like Figure 3As shown, the sealing seat 5 includes an upper sealing seat 51 and a lower sealing seat 52, a first sealing ring 511 is arranged between the upper sealing seat 51 and the piston 4, a second sealing ring 512 is arranged between the upper sealing seat 51 and the cylinder 2, a third sealing ring 521 is arranged between the lower sealing seat 52 and the valve stem 6, and a fourth sealing ring 522 is arranged between the lower sealing seat 52 and the valve body 3. The sealing seat 5 is of split type, the upper end of the upper sealing seat 51 and the lower end of the lower sealing seat 52 are both open, which is convenient for assembling sealing rings, and the arrangement of multiple sealing rings on the sealing seat 5 ensures the sealing between the cylinder 2, the valve body 3 and the piston 4.

[0030] like Figure 6 and Figure 7 As shown, the valve stem 6 includes a first spiral section 62, a polished rod section 63 and a second spiral section 64. The first spiral section 62 is threadedly matched with the piston 4, and the polished rod section 63 is gap-matched with the piston 4. The second spiral section 64 is threadedly matched with the ejector rod 8, and the polished rod section 63 is gap-matched with the ejector rod 8. The first spiral section 62 and the second spiral section 64 fix the two ends of the valve stem 6 on the piston 4 and the ejector rod 8, and the polished rod section 63 is gap-matched with the piston 4 and the ejector rod 8. This design can ensure the coaxiality of the valve stem 6, the ejector rod 8 and the piston 4, and reduce or avoid the eccentric wear of the third sealing ring 521.

[0031] like Figure 5 As shown, in order to allow the electrolyte to flow smoothly into the injection nozzle 9, the push rod 8 is provided with a special-shaped support member 81. The special-shaped support member 81 can support the push rod 8 while allowing the electrolyte to flow down from the area a enclosed between the special-shaped support member 81 and the injection tube 7 (if it is in a fully sealed state, the electrolyte cannot flow down). The special-shaped support member 81 plays a guiding role and ensures the coaxiality of the push rod 8 and the injection tube 7.

[0032] like Figure 2 As shown, the sealing member includes a first wedge 611 and a second wedge 612, wherein the first wedge 611 is arranged between the valve body 3 and the injection pipe 7, and the second wedge 612 is arranged between the screw sleeve 61 and the injection pipe 7. The first wedge 611 and the second wedge 612 make the seal between the screw sleeve 61 and the injection pipe 7 tighter.

[0033] The hardness of the push rod 8 is greater than the hardness of the injection nozzle 9. For example, the push rod 8 is made of metal and the injection nozzle 9 is made of non-metallic material. This combination of softness and hardness can make the sealing between the push rod 8 and the injection nozzle 9 better. The annular line seal between the push rod 8 and the injection nozzle 9 prevents the electrolyte from leaking when the needle valve assembly is closed and no electrolyte is injected. The needle valve assembly is provided with multiple sealing rings to perform annular line sealing on the needle valve. The elastic deformation of the sealing ring is close to the sealing surface, eliminating the gap and preventing the leakage of the medium.

[0034] The valve stem 6, ejector rod 8 and injection nozzle 9 inside the cylinder 2 are designed as split parts. For needle valve assemblies with complex structures and small structures, the split part can simplify the shape of individual parts and reduce the difficulty of processing individual parts. The split design provides the possibility of precise adjustment of key dimensions such as coaxiality and parallelism during assembly. By using precise assembly tools and correction devices, the high matching between the components can be ensured during the final assembly, achieving higher overall accuracy.

[0035] The screw sleeve 61 provided at the connection between the valve body 3 and the injection pipe 7, and the valve core screw sleeve 71 provided at the connection between the injection pipe 7 and the injection nozzle 9 are separately provided to ensure the sealing of the entire needle valve assembly and prevent leakage of the electrolyte. The utility model is described above by way of example, but the utility model is not limited to the above specific embodiments, and any changes or modifications made based on the utility model belong to the scope of protection claimed by the utility model.

Claims

1. A needle valve assembly for injecting electrolyte, characterized in that: The invention comprises a top cover (1), a cylinder (2), a valve body (3), a valve stem (6) and a liquid injection pipe (7); the top cover (1) is threadedly connected to the top of the cylinder (2); a first air hole (21) and a second air hole (22) are provided on the cylinder (2); the cylinder (2) and the valve body (3) are connected by screws; a threaded hole (23) is provided on the valve body (3); the threaded hole (23) is used to install a check valve; the valve body (3) is sleeved on the liquid injection pipe (7); a threaded sleeve (61) is sleeved on the valve body (3); a sealing member is provided between the threaded sleeve (61) and the liquid injection pipe (7) The lower end of the injection pipe (7) is connected to the injection nozzle (9), a valve core screw sleeve (71) is arranged at the connection between the injection pipe (7) and the injection nozzle (9), the injection pipe (7) and the valve core screw sleeve (71) are threadedly connected, a piston (4) is arranged in the cylinder (2), a guide member (41) and a piston sealing ring (42) are installed between the piston (4) and the cylinder (2), a sealing seat (5) is sleeved on the piston (4) and the valve stem (6), one end of the valve stem (6) is threadedly connected to the piston (4), and the other end is connected to the push rod (8); the injection pipe (7) is sleeved on the valve stem (6).

2. The needle valve assembly for electrolyte injection according to claim 1, characterized in that: A guide ring (43) is provided between the piston (4) and the sealing seat (5); the guide ring (43) and the sealing seat (5) are interference fit and have a clearance fit with the piston (4).

3. The needle valve assembly for electrolyte injection according to claim 1, characterized in that: The sealing seat (5) comprises an upper sealing seat (51) and a lower sealing seat (52); a first sealing ring (511) is arranged between the upper sealing seat (51) and the piston (4); a second sealing ring (512) is arranged between the upper sealing seat (51) and the cylinder (2); a third sealing ring (521) is arranged between the lower sealing seat (52) and the valve stem (6); and a fourth sealing ring (522) is arranged between the lower sealing seat (52) and the valve body (3).

4. The needle valve assembly for electrolyte injection according to claim 1, characterized in that: The valve stem (6) comprises a first spiral section (62), a smooth rod section (63) and a second spiral section (64); the first spiral section (62) and the piston (4) are threadedly matched and the smooth rod section (63) and the piston (4) are clearance matched; the second spiral section (64) and the push rod (8) are threadedly matched and the smooth rod section (63) and the push rod (8) are clearance matched.

5. The needle valve assembly for electrolyte injection according to claim 1, characterized in that: A special-shaped support member (81) is provided on the top rod (8).

6. The needle valve assembly for electrolyte injection according to claim 1, characterized in that: The sealing member comprises a first wedge-shaped member (611) and a second wedge-shaped member (612); the first wedge-shaped member (611) is arranged between the valve body (3) and the liquid injection pipe (7); and the second wedge-shaped member (612) is arranged between the threaded sleeve (61) and the liquid injection pipe (7).

7. The needle valve assembly for electrolyte injection according to claim 1, characterized in that: The guide member (41) is a wear-resistant member.

8. The needle valve assembly for electrolyte injection according to claim 7, characterized in that: The hardness of the guide member (41) is greater than the hardness of the piston sealing ring (42).

9. The needle valve assembly for electrolyte injection according to claim 1, characterized in that: An annular line seal is formed between the ejector rod (8) and the liquid injection nozzle (9).

10. The needle valve assembly for electrolyte injection according to claim 9, characterized in that: The hardness of the ejector rod (8) is greater than the hardness of the liquid injection nozzle (9).

Images