Vacuum injection device

Abstract

The present invention provides a vacuum liquid injection device, which is used for liquid injection under a vacuum environment, wherein the vacuum liquid injection device comprises: a vacuum chamber, a material chamber, a hydraulic control chamber, a piston assembly and a hydraulic power device, wherein the material chamber, the hydraulic control chamber and the piston assembly are arranged inside the vacuum chamber, and the piston assembly comprises a first piston, a connecting rod and a second piston; the first piston is arranged in the material chamber, the second piston is arranged in the hydraulic control chamber, and the first piston is connected to the second piston through the connecting rod; the hydraulic power device is connected to the hydraulic control chamber to inject control liquid into the hydraulic control chamber, so that the control liquid pushes the second piston to move in the hydraulic control chamber when being injected, so that the first piston follows the movement in the material chamber, so that the material in the material chamber is pushed by the first piston to complete the liquid injection operation under a vacuum environment.

Description

Technical Field

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

[0002] Most of the existing injection pumps use the method of evacuating the air in the cavity to generate a certain negative pressure to transport liquids. To a large extent, they use the pressure difference between the atmospheric pressure and the pump body to transport liquids. There are very few injection pumps that can be used under vacuum conditions without affecting the accuracy. Even if there are some pumps that meet the vacuum conditions, they all have the defects of complex design or high price.

[0003] Therefore, a new vacuum injection scheme is needed. Summary of the invention

[0004] In view of this, the embodiments of the present specification provide a vacuum liquid injection device, which is not affected by the decrease in ambient air pressure, has a stable liquid injection speed, a controllable liquid injection volume, is easy to operate, has a simple structure, and has low use and maintenance costs.

[0005] The embodiment of this specification provides a vacuum liquid injection device, which is implemented by the following technical solution:

[0006] A vacuum liquid injection device, comprising: a vacuum chamber, a material chamber, a hydraulic control chamber, a piston assembly and a hydraulic power device, wherein the material chamber, the hydraulic control chamber and the piston assembly are arranged inside the vacuum chamber, and the piston assembly comprises a first piston, a connecting rod and a second piston;

[0007] The first piston is disposed in the material body chamber, the second piston is disposed in the hydraulic control chamber, and the first piston is connected to the second piston via the connecting rod;

[0008] The hydraulic power device is connected to the hydraulic control chamber to inject control liquid into the hydraulic control chamber, so that the control liquid pushes the second piston to move in the hydraulic control chamber when being injected, so that the first piston follows the movement in the material chamber, so that the first piston pushes the material in the material chamber to complete the injection operation under a vacuum environment.

[0009] In the above structure, the hydraulic power device has a simple structure, is easy to use and maintain, has low use and maintenance costs, and can conveniently control the injection speed and injection amount of the hydraulic power device by controlling the injection speed and injection amount of the control fluid in the hydraulic control chamber.

[0010] The present invention also provides a solution, wherein the hydraulic power device is also used to absorb the control fluid in the hydraulic control chamber, so that when the control fluid is absorbed, it drives the second piston to move in the hydraulic control chamber, so that the first piston follows the movement in the material chamber to suck the material into the material chamber.

[0011] The present invention further provides a solution, wherein the sucking of the material into the material chamber comprises: sucking the material into the material chamber under normal pressure.

[0012] The present invention also provides a solution, wherein the hydraulic power device is located outside the vacuum chamber.

[0013] The present invention also provides a solution, wherein the hydraulic power device comprises a metering pump.

[0014] The present invention also provides a solution, wherein the control fluid includes hydraulic oil or degassed water.

[0015] The present invention also provides a solution, wherein the material body chamber and the hydraulic control chamber are two chambers of different sizes.

[0016] The present invention further provides a solution, wherein the material body chamber and the first piston constitute a first syringe structure;

[0017] And / or, the hydraulic control chamber and the second piston constitute a second syringe structure.

[0018] The present invention also provides a solution, wherein the vacuum liquid injection device also includes a three-way valve, which is arranged in the vacuum chamber, wherein the first port of the three-way valve is connected to a material inlet pipe, the third port of the three-way valve is connected to a material outlet pipe, and the second port of the three-way valve is connected to the material chamber, so that when the material chamber is used to replenish the material, the material is sucked from the material inlet pipe through the first port of the three-way valve, and when the material chamber is used for liquid injection, the material is injected into the material outlet pipe through the third port of the three-way valve.

[0019] The present invention also provides a solution, wherein the vacuum degree of the vacuum chamber is -0.3 MPa to -0.1 MPa.

[0020] Compared with the prior art, at least one of the above-mentioned technical solutions adopted in the embodiments of this specification can achieve at least the following beneficial effects: the vacuum liquid injection device provided by the present invention can be used for liquid injection under a vacuum environment. When liquid is injected under a vacuum environment, that is, in a vacuum chamber, the piston assembly forms a closed and independent chamber with the material chamber and the hydraulic control chamber respectively. At this time, the control liquid can be quantitatively injected into the hydraulic control chamber to push the two pistons in the piston assembly to work together, thereby injecting the material in the material chamber under a vacuum environment, that is, injecting the material into the container or cavity to be injected. It not only has a simple structure, is easy to use and maintain, and has low use and maintenance costs, but also the injection speed, injection volume, etc. are all controllable.

[0021] Furthermore, the present invention can be applied to the transportation (i.e., injection) of sensitive materials (such as colloidal protein liquid) under a vacuum environment, and can well meet the control requirements of sensitive materials for the transportation process. For example, it can avoid the influence of factors such as vibration, shear force, temperature, and pressure changes during the injection process, and can reduce the risk of denaturation during material transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of a double-chamber, double-piston vacuum liquid injection device;

[0024] Figure 2 It is a structural schematic diagram of a single-chamber, double-piston vacuum liquid injection device;

[0025] Figure 3 It is a schematic diagram of the structure of a vacuum liquid injection device with a single chamber and a single piston;

[0026] Figure 4 It is a schematic diagram of the structure of a vacuum liquid injection device in which the material body chamber is larger than the hydraulic control chamber;

[0027] Figure 5 The invention is a structural schematic diagram of a double-chamber and double-piston vacuum liquid injection device including a three-way valve. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0030] It should be noted that in the specification, the same or similar reference numerals represent the same or similar components. The following drawings are intended to illustrate the overall inventive concept of the present invention and should not be construed as a limitation of the present invention. Based on the embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0031] In addition, in the description of this specification, it should be understood that the directional words such as "upper", "lower", "inside", and "outside", and the quantifiers such as "first", "second", and "third" described in the example embodiments of this specification are described from the perspectives shown in the accompanying drawings and should not be understood as limitations on the example embodiments of this specification.

[0032] In various production processes, people sometimes need to inject liquid materials into thin air or an environment with pressure lower than normal atmospheric pressure, that is, vacuum liquid injection operation, to meet the requirements of production process or production safety. For example: in the production process of casting molds, the air inside the mold is pumped out before injecting the material liquid; in the production process of lithium batteries, the air inside the battery shell is pumped out before injecting the electrolyte, etc.

[0033] The inventor found that the vacuum injection pump usually includes a vacuum pump and a liquid injection device. During vacuum injection, the vacuum pump is first connected to extract the air inside the container or cavity to be injected with the material to form a vacuum environment, and then the liquid injection device is connected. Since the air pressure in the liquid injection device is greater than the air pressure in the container or cavity to be injected, the material liquid will enter the container or cavity driven by the air pressure difference to complete the vacuum injection. Due to the existence of the air pressure difference, the injection speed and injection amount of the liquid are difficult to control.

[0034] For example, at the beginning of liquid injection, the air pressure difference is large, the liquid injection speed is high, and the injection amount is large; when the liquid injection is close to the end, the air pressure difference is small, the liquid injection speed is low, and the injection amount is small. Therefore, the liquid injection operation is difficult, and it is difficult to stably and uniformly inject a certain amount of liquid in a vacuum environment, and the accuracy of liquid injection is greatly affected.

[0035] In addition, there are few types of injection pumps that can be used under vacuum conditions and can accurately inject liquid, and the injection pumps that meet vacuum conditions are complex in design and expensive.

[0036] In view of this, the inventor has conducted in-depth analysis and research and explored a vacuum liquid injection device suitable for liquid injection in a vacuum environment. The vacuum liquid injection device includes a material chamber, a hydraulic control chamber, a piston assembly, a hydraulic power device, and a vacuum chamber;

[0037] Injecting a material body through a material body chamber;

[0038] A power source for forming a material body chamber through a hydraulically controlled chamber;

[0039] By connecting the piston assembly of the material chamber and the hydraulic control chamber, the control liquid injection process in the hydraulic control chamber is synchronized with the material injection process in the material chamber (i.e., the process of the material leaving the material chamber);

[0040] A control fluid is quantitatively injected into the hydraulic control chamber through a hydraulic power device to push the piston assembly to move toward the material chamber;

[0041] A vacuum environment for injection is provided by setting a vacuum chamber, and arranging a material chamber, a hydraulic control chamber, and a piston assembly inside the vacuum chamber.

[0042] In some embodiments, Figure 1 As shown, the vacuum liquid injection device includes a vacuum chamber 1, a material chamber 2, a hydraulic control chamber 3, a piston assembly and a hydraulic power device 5; wherein the material chamber 2, the hydraulic control chamber 3 and the piston assembly 4 are arranged inside the vacuum chamber 1; the material chamber 2 is connected to the container to be injected through the material outlet 8; the piston assembly 4 includes a first piston 41, a connecting rod 42 and a second piston 43; the first piston 41 is located in the material chamber 2, the second piston 43 is located in the hydraulic control chamber 3, and the first piston 41 and the second piston 43 are connected by the connecting rod 42; the hydraulic power device 5 is connected to the hydraulic control chamber 3 to inject control liquid into the hydraulic control chamber 3, and when the hydraulic power device 5 injects control liquid into the hydraulic control chamber 3, the following mechanical movement is realized:

[0043] The control fluid is injected into the hydraulic control chamber 3, pushing the second piston 43 to move in the hydraulic control chamber 3. Through the connecting rod 42, the first piston 41 follows the movement in the material chamber 3, pushing the material in the material chamber 3 to complete the injection operation under a vacuum environment.

[0044] The liquid injection operation process using the above vacuum liquid injection device includes:

[0045] Step S1, injecting material into the material chamber 2;

[0046] Step S2, extracting air from the vacuum chamber 1;

[0047] Step S3 , using the hydraulic power device 5 to inject control fluid into the hydraulic control chamber 3 .

[0048] It should be noted that the amount of control fluid injected into the hydraulic control chamber 3 and the speed of injecting the control fluid can be controlled to control the moving distance and speed of the first piston 41 and the second piston 43, thereby controlling the amount of material injected into the material chamber 2 and the speed of injecting the material.

[0049] For example, a syringe with a scale is used as a hydraulic power device, and the amount of control fluid injected into the control chamber 3 is determined by observing the readings of the syringe during the pushing process, and the speed of injecting the material body is controlled by controlling the speed of pushing the syringe.

[0050] For example, a metering pump is used as a hydraulic power device, and the amount of control liquid injected into the control chamber 3 is determined by controlling the operation time of the metering pump, and the speed of injecting the material body is controlled by setting the flow rate of the metering pump.

[0051] For example, an observation window can be provided on the vacuum chamber 1 to understand the completion of the injection, and when the injection amount is reached, the hydraulic power device 5 is stopped; the speed of the injection body can be understood through the observation window to adjust the speed of the injection body.

[0052] It should also be noted that the hydraulic power device 5 can be located outside the vacuum chamber 1 or inside the vacuum chamber 1. Figure 2 and Figure 3 shown.

[0053] The vacuum liquid injection device provided by the present invention can be used for liquid injection under vacuum environment. The container or cavity of the material to be transported is placed in the vacuum chamber 1. In the vacuum environment provided by the vacuum chamber 1, the material in the material chamber 2 is discharged through the hydraulic control chamber 3 and the piston assembly 4 to complete the injection of the material. The vacuum injection device has a simple structure, is easy to use and maintain, and has low use and maintenance costs. Moreover, the speed and amount of the control liquid injected into the hydraulic control chamber 3 by the hydraulic power device 5 can be controlled, thereby controlling the moving speed and moving distance of the first piston 41, thereby achieving the effect that the injection speed and injection amount can be controlled.

[0054] During use, the inventors also found that the vacuum liquid injection device of the present invention can well meet the control requirements of conveying (i.e., liquid injection) sensitive materials in a vacuum environment. Sensitive materials refer to materials that are easily affected by factors such as shock, shear force, temperature, and pressure changes.

[0055] When conveying sensitive materials, use devices and methods similar to those for conveying ordinary materials. First, use a vacuum device to extract the air inside the container where the material is to be injected. The liquid injection device uses switches, pistons and other mechanisms to isolate the sensitive material from the container to be injected. When the required vacuum degree is reached, open the switch, piston and other mechanisms to allow the sensitive liquid to enter the container. After the vacuum operation is completed, open the switch, piston and other mechanisms, and the sensitive material is affected by the sudden change in the air pressure environment and enters a relatively low-pressure air pressure environment. The liquid material is prone to deterioration and denaturation. For example: when a protein solution is injected into a vacuum container, the protein solution will deteriorate and denature due to the sudden change in air pressure, and even agglomerate, blocking the injection pipeline, affecting the product quality of the injected liquid and the injection operation.

[0056] By using the above-mentioned vacuum liquid injection device, sensitive materials are conveyed, and the container of the material to be conveyed is placed in the vacuum chamber 1, and the material outlet 8 is connected to the container of the material to be conveyed. Therefore, the material chamber 2, the material outlet 8, and the container of the material to be conveyed are all in the vacuum chamber 1, so that the material and the container of the material to be conveyed are in the same air pressure environment, and the pressure is reduced together during the vacuum extraction process, thereby avoiding the occurrence of a sharp drop in air pressure, thereby avoiding the occurrence of deterioration and denaturation of sensitive materials during the vacuum liquid injection process, and ensuring the conveying quality of sensitive materials in a vacuum environment.

[0057] In some embodiments, Figure 2As shown, a cavity can be used, and the cavity is divided into two parts on the left and right by two pistons (a first piston and a second piston), respectively forming a material chamber 2 and a hydraulic control chamber 3. The two pistons are connected by a connecting rod 42 to form a piston assembly. The structure and combination of the vacuum chamber 1, the piston assembly and the hydraulic power device 5 can refer to the aforementioned embodiment and will not be repeated here.

[0058] In some embodiments, Figure 3 As shown, on the basis of a cavity being divided into two left and right parts, the first piston 41, the connecting rod 42 and the second piston 43 of the piston assembly can be combined into the first piston 41, and the structure and combination of the vacuum chamber 1 and the hydraulic power device 5 can refer to the aforementioned implementation manner, which will not be repeated here.

[0059] In some embodiments, the hydraulic power device 5 is also used to absorb the control liquid in the hydraulic control chamber 3, for example, a piston pump or a peristaltic pump with a reversing function is used as the hydraulic power device. When the control liquid is absorbed, the control liquid drives the second piston 43 in the hydraulic control chamber 3 to move, so that the first piston 41 moves in the material chamber 2, so that the material is sucked into the material chamber 2. Using the hydraulic power device 5 to absorb the control liquid is convenient for filling the material chamber 2 with the material, and can provide convenience for continuous operation.

[0060] In some embodiments, when the hydraulic power device 5 absorbs the control liquid in the hydraulic control chamber 3, the material chamber 2 absorbs the material under normal pressure. For example: place a container containing the material in the vacuum chamber 1, connect the container containing the material and the material chamber 2, use a syringe as a hydraulic power device, connect the syringe to the hydraulic control chamber 3, and draw the syringe under normal pressure to make the material chamber 2 absorb the material; place the container containing the material outside the vacuum chamber 1, connect the container containing the material and the material chamber 2, use a piston pump or peristaltic pump with a reversing function, connect the piston pump or peristaltic pump to the hydraulic control chamber 3, reverse the piston pump or peristaltic pump, and make the material chamber 2 absorb the material.

[0061] In some embodiments, the hydraulic power device 5 is located outside the vacuum chamber 1. Placing the hydraulic power device 5 outside the vacuum chamber 1 is convenient for controlling the hydraulic power device from the outside, and is also conducive to maintaining and servicing the hydraulic power device, especially when a precision metering pump is used as the hydraulic power device, the service life of the metering pump can be increased.

[0062] In some embodiments, the hydraulic power device 5 includes a quantitative pump, and the quantitative pump includes a plunger pump, a piston pump, a diaphragm pump, a peristaltic pump, and the like.

[0063] It should be noted that the metering pump can be connected to a control device to control the working time and working flow rate of the metering pump. It should also be noted that the connection between the metering pump and the control device is not limited to electrical connection, wireless connection, etc., and any commonly used connection method can be used to achieve the purpose of controlling the operation of the metering pump. Similarly, the control device can also include an information feedback device and / or a display device to receive and / or feedback the operation of the metering pump.

[0064] In some embodiments, the control fluid used in the vacuum injection device includes hydraulic oil or degassed water, and other liquids that are not easily affected by changes in air pressure may also be used.

[0065] In some embodiments, before injecting the control fluid into the hydraulic control chamber 3 , the control fluid in the hydraulic control chamber 3 is drained so that the second piston 43 is closely attached to the side wall of the control fluid injection port of the hydraulic control chamber 3 .

[0066] In some embodiments, Figure 4 As shown, the chamber of the material chamber 2 is larger than the chamber of the hydraulic control chamber 3. With a larger material chamber 2, more material can be injected to improve the injection efficiency. Optionally, the radial area of ​​the first piston 41 of the material chamber 2 is larger than the radial area of ​​the second piston 43 of the hydraulic control chamber 3. A certain amount of material is added to the material chamber 2 under normal pressure, and then injected under vacuum. The hydraulic power device 5 pushes the first piston 41 and the second piston 43 to move the same distance. Since the radial area of ​​the first piston is larger, more material is injected, thereby improving the injection efficiency.

[0067] In some embodiments, the chamber of the material chamber 2 is smaller than the chamber of the hydraulic control chamber 3. Optionally, the radial area of ​​the first piston 41 of the material chamber 2 is smaller than the radial area of ​​the second piston 43 of the hydraulic control chamber 3, and when the first piston 41 and the second piston 43 move simultaneously, the material chamber 2 injects less material to improve the injection accuracy.

[0068] In some embodiments, the material chamber 2 and the first piston 41 constitute a first syringe structure. The radial shape of the piston in the syringe structure is circular, and cooperates with the cylindrical side wall of the material chamber 2 to form a stable and reliable seal, which is conducive to the injection operation in a vacuum environment.

[0069] In some embodiments, the hydraulic control chamber 3 and the second piston 43 constitute a second syringe structure. Further, while constituting the second syringe structure, the material chamber 2 and the first piston 41 constitute a first syringe structure.

[0070] In some embodiments, Figure 5As shown, the vacuum liquid injection device also includes a three-way valve 6, which is located in the vacuum chamber 1. The first port of the three-way valve 6 is connected to the material inlet pipe 9, the third port of the three-way valve is connected to the material outlet pipe 8, the second port of the three-way valve is connected to the material chamber 2, the outlet pipe 8 is connected to the container to be injected, and the inlet pipe 9 is connected to the container containing the material.

[0071] When performing the liquid injection operation, the three-way valve 6 can be operated as follows:

[0072] When injecting the material, that is, when the second port and the third port of the three-way valve are connected, the liquid in the material chamber can be injected into the material outlet pipe 8 through the third port;

[0073] When the material is added, that is, when the second port and the first port of the three-way valve are connected, the material can be added into the material chamber through the inlet pipe 9 connected to the first port.

[0074] In some embodiments, the second port and the third port of the three-way valve 6 are first connected to perform material injection, and then the second port and the first port of the three-way valve 6 are connected, and the control liquid in the hydraulic control chamber 3 is sucked by the hydraulic power device 5, for example, a peristaltic pump or a plunger pump that can be reversed is used to replenish the material chamber with material liquid, completing a cycle of liquid injection and liquid replenishment. Repeating the above cycle process can perform vacuum liquid injection operations for large-capacity containers.

[0075] Optionally, the inlet pipe 9 is connected to a liquid container placed outside the vacuum chamber 1, so that the liquid can be replenished to the material chamber 2 more conveniently.

[0076] Optionally, the three-way valve 6 is located outside the vacuum chamber 1 , which makes it more convenient to select and control the conduction state of the three-way valve 6 .

[0077] In some embodiments, a vacuum pump is used to extract the air in the vacuum chamber 1 to provide the required vacuum degree for the vacuum injection operation.

[0078] Preferably, the vacuum degree of the vacuum chamber 1 is -0.3 MPa, and the liquid injection operation is performed in an air pressure environment of -0.3 MPa;

[0079] Preferably, the vacuum degree of the vacuum chamber 1 is set to -0.1 MPa, and the liquid injection operation is performed in an atmosphere of -0.1 MPa.

[0080] The vacuum liquid injection device of the present invention can be used in an air pressure environment with a high vacuum degree of -0.3MPa to -0.1MPa, and the product has good applicability.

[0081] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the method embodiment described later, since it corresponds to the system, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0082] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A vacuum liquid injection device, characterized in that: Applicable to liquid injection under vacuum environment, the vacuum liquid injection device comprises: a vacuum chamber, a material chamber, a hydraulic control chamber, a piston assembly and a hydraulic power device, wherein the material chamber, the hydraulic control chamber and the piston assembly are arranged inside the vacuum chamber, and the piston assembly comprises a first piston, a connecting rod and a second piston; The first piston is disposed in the material body chamber, the second piston is disposed in the hydraulic control chamber, and the first piston is connected to the second piston via the connecting rod; The hydraulic power device is connected to the hydraulic control chamber to inject control liquid into the hydraulic control chamber, so that the control liquid pushes the second piston to move in the hydraulic control chamber when being injected, so that the first piston follows the movement in the material chamber, so that the first piston pushes the material in the material chamber to complete the injection operation under a vacuum environment.

2. The vacuum liquid injection device according to claim 1, characterized in that: The hydraulic power device is also used to absorb the control fluid in the hydraulic control chamber, so that when the control fluid is absorbed, it drives the second piston to move in the hydraulic control chamber, so that the first piston follows the movement in the material chamber to suck the material into the material chamber.

3. The vacuum liquid injection device according to claim 2, characterized in that: The step of sucking the material into the material chamber includes: sucking the material into the material chamber under normal pressure.

4. The vacuum liquid injection device according to claim 1, characterized in that: The hydraulic power unit is located outside the vacuum chamber.

5. The vacuum liquid injection device according to claim 1, characterized in that: The hydraulic power unit comprises a fixed displacement pump.

6. The vacuum liquid injection device according to claim 1, characterized in that: The control fluid includes hydraulic oil or degassed water.

7. The vacuum liquid injection device according to claim 1, characterized in that: The material body chamber and the hydraulic control chamber are two chambers of different sizes.

8. The vacuum liquid injection device according to claim 1, characterized in that: The material body chamber and the first piston constitute a first syringe structure; And / or, the hydraulic control chamber and the second piston constitute a second syringe structure.

9. The vacuum liquid injection device according to claim 1, characterized in that: The vacuum liquid injection device also includes a three-way valve, which is arranged in the vacuum chamber, the first port of the three-way valve is connected to the material inlet pipeline, the third port of the three-way valve is connected to the material outlet pipeline, and the second port of the three-way valve is connected to the material chamber, so that when the material chamber is used to replenish the material, the material is sucked from the material inlet pipeline through the first port of the three-way valve, and when the material chamber is used for liquid injection, the material is injected into the material outlet pipeline through the third port of the three-way valve.

10. The vacuum liquid injection device according to claim 1, characterized in that: The vacuum degree of the vacuum chamber is -0.3MPa to -0.1MPa.

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