Multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection equipment

Abstract

The invention provides multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection equipment, and relates to the technical field of aluminum electrolytic capacitor liquid injection. The multi-stage negative pressure permeation type aluminum electrolytic capacitor liquid injection equipment comprises a liquid injection operation table, the upper surface of the liquid injection operation table is fixedly connected with a fixed stand column, and the outer surface of the fixed stand column is rotationally connected with a material swinging rotating disc. According to the device, a first driving air cylinder is started, a piston end of the first driving air cylinder drives a second connecting shaft to descend, the second connecting shaft drives a liquid injection barrel to descend, so that a liquid injection pipeline descends to a liquid injection position, then a liquid extraction pump body is started, a liquid injection valve on the liquid injection pipeline is opened, and electrolyte in the liquid injection barrel slowly permeates downwards through a multi-stage permeable membrane; and finally, the electrolyte enters the aluminum electrolytic capacitor through the electrolyte injection pipeline, so that the influence caused by too fast electrolyte injection is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolytic capacitor injection technology, in particular to a multi-stage negative pressure infiltration type electrolytic capacitor injection equipment. BACKGROUND

[0002] As a kind of energy storage components, capacitor has the advantages of high power density, high cycle life and fast charge and discharge, etc. It has the functions of tuning, filtering, coupling and bypass in electronic circuit. With the progress of modern science and technology, capacitor is widely used in electronic products, communication products, automation control, optoelectronic products and other fields.

[0003] The existing aluminum electrolytic capacitor can be divided into solid aluminum electrolytic capacitor and liquid aluminum electrolytic capacitor according to the form of electrolyte. Among them, the liquid aluminum electrolytic capacitor is made by immersing the core in the electrolyte, and then sealing the core containing the electrolyte in the aluminum shell, so that the capacitor has electrolyte inside.

[0004] The traditional aluminum electrolytic capacitor is generally directly injected by injection head when injecting electrolyte, which leads to too fast injection of electrolyte, which may cause electrolyte overflow from the capacitor shell, resulting in environmental pollution and safety hazard. Moreover, the fast injection of electrolyte may cause uneven distribution of electrolyte in the capacitor, affecting the electrical performance and stability of the capacitor. In addition, the electrolyte may not be fully soaked in the electrode material inside the capacitor, resulting in reduced activity of the electrolyte, and thus affecting the service life and performance of the capacitor. SUMMARY

[0005] (I) The technical problem to be solved

[0006] In view of the shortcomings of the prior art, the present application provides a multi-stage negative pressure infiltration type electrolytic capacitor injection equipment, which solves the defects and deficiencies in the prior art.

[0007] (II) Technical scheme

[0008] In order to achieve the above object, the present application is realized by the following technical scheme: a multi-stage negative pressure permeation type aluminum electrolytic capacitor liquid injection equipment, comprising a liquid injection operation table, the upper surface of the liquid injection operation table is fixedly connected with a fixed stand, the outer surface of the fixed stand is rotatably connected with a material swinging rotary disc, the lower surface of the liquid injection operation table is installed with a power assembly for driving the material swinging rotary disc to rotate, the top of the fixed stand is fixedly connected with an upper horizontal mounting plate, one side of the upper surface of the upper horizontal mounting plate is fixedly connected with a supporting mounting stand, the top of the supporting mounting stand is fixedly connected with an electrolyte storage tank, the other side of the upper surface of the upper horizontal mounting plate is connected with a liquid injection cylinder through a lifting assembly, the inside of the liquid injection cylinder is fixedly installed with three permeation membranes, the upper surface of the upper horizontal mounting plate is installed with a liquid supply assembly connected with the liquid injection cylinder, one side of the upper horizontal mounting plate is connected with an air extraction assembly connected with the liquid injection cylinder, the lower surface of the liquid injection operation table is installed with a jacking assembly.

[0009] Preferably, the power assembly comprises a first mounting frame fixedly connected to the lower surface of the liquid injection operation table, the lower surface of the first mounting frame is fixedly connected with a servo motor, the output shaft of the servo motor is fixedly connected with a first connecting shaft, one end of the first connecting shaft away from the servo motor is fixedly connected with a rotary drive gear, the outer surface of the material swinging rotary disc is fixedly connected with a rotary fixed gear ring, and the rotary drive gear is meshingly connected with the rotary fixed gear ring.

[0010] Preferably, the lifting assembly comprises a first drive air cylinder fixedly connected to the upper surface of the upper horizontal mounting plate, the piston end of the first drive air cylinder is fixedly connected with a second connecting shaft, one end of the second connecting shaft away from the first drive air cylinder is fixedly connected with the top of the liquid injection cylinder, the first drive air cylinder is started, the piston end of the first drive air cylinder takes the second connecting shaft down, the second connecting shaft takes the liquid injection cylinder down, and the liquid injection pipeline is lowered to the liquid injection position.

[0011] Preferably, the liquid supply assembly comprises a liquid pumping body fixedly connected to the upper surface of the upper horizontal mounting plate, the inlet of the liquid pumping body is fixedly connected with a first liquid pumping pipeline, one end of the first liquid pumping pipeline away from the liquid pumping body is fixedly connected with the side wall of the electrolyte storage tank, the outlet of the liquid pumping body is fixedly connected with a second liquid pumping pipeline, one end of the second liquid pumping pipeline away from the liquid pumping body is fixedly connected with a first connecting hose, and one end of the first connecting hose away from the second liquid pumping pipeline is fixedly connected with the liquid injection cylinder, the liquid pumping body is started, the liquid pumping body extracts the electrolyte inside the electrolyte storage tank through the first liquid pumping pipeline, then the electrolyte enters the inside of the second liquid pumping pipeline, and then enters the inside of the first connecting hose through the second liquid pumping pipeline, and then enters the inside of the liquid injection cylinder through the first connecting hose.

[0012] Preferably, the air extraction assembly comprises a connecting mount fixedly connected to one side of the upper horizontal mounting plate, the upper surface of the connecting mount is fixedly connected with an air extraction pump body, the inlet of the air extraction pump body is fixedly connected with a first air extraction pipeline, the end of the first air extraction pipeline away from the air extraction pump body is fixedly connected with a second connecting hose, the end of the second connecting hose away from the first air extraction pipeline is fixedly connected with the liquid injection cylinder body, the outlet of the air extraction pump body is fixedly connected with a second air extraction pipeline, the air extraction pump body is started, and the air extraction pump body extracts part of the air in the liquid injection cylinder body through the first air extraction pipeline and the second connecting hose, so that a negative pressure state is formed in the liquid injection cylinder body.

[0013] Preferably, the jacking assembly comprises a second mounting frame fixedly connected to the lower surface of the liquid injection operation table, the lower surface of the second mounting frame is fixedly connected with a second drive cylinder, the piston end of the second drive cylinder is fixedly connected with a jacking rod, the surface of the liquid injection operation table is provided with a first through hole, the jacking rod is matched with the first through hole, the second drive cylinder is started, the piston end of the second drive cylinder carries the jacking rod to rise, the jacking rod enters the second through hole through the first through hole, and the aluminum electrolytic capacitor is jacked up, so that the aluminum electrolytic capacitor is conveniently discharged.

[0014] Preferably, the upper surface of the material placing rotary disc is provided with a plurality of placing grooves, the inside of the placing grooves is provided with a second through hole, and the second through hole is matched with the first through hole.

[0015] Preferably, the bottom of the liquid injection cylinder body is fixedly connected with a liquid injection pipeline, and the outer surface of the liquid injection pipeline is provided with a liquid injection valve.

[0016] (Three) beneficial effects

[0017] The application provides a multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection equipment.

[0018] 1、the application, the first drive cylinder is started, the piston end of the first drive cylinder carries the second connecting shaft to descend, the second connecting shaft carries the liquid injection cylinder body to descend, so that the liquid injection pipeline descends to a liquid injection position, then the liquid pump body is started, the liquid pump body extracts the electrolyte in the electrolyte storage tank through the first liquid extraction pipeline, then the electrolyte enters the inside of the second liquid extraction pipeline, and then enters the first connecting hose through the second liquid extraction pipeline, and finally enters the inside of the liquid injection cylinder body through the first connecting hose, the liquid injection valve on the liquid injection pipeline is opened, the electrolyte in the liquid injection cylinder body slowly penetrates downwards through the multi-stage infiltration membrane, and finally enters the aluminum electrolytic capacitor through the liquid injection pipeline, thereby avoiding the influence caused by too fast injection of the electrolyte.

[0019] 2、The application, start the servo motor, the output shaft of the servo motor rotates with the first connecting shaft, the first connecting shaft rotates with the rotary drive gear, the rotary drive gear rotates with the rotary fixed gear ring, so that the rotary fixed gear ring rotates with the material swinging rotary disc, another aluminum electrolytic capacitor is rotated to the lower side of the liquid injection cylinder, the above operation is repeated, the liquid injection operation of another aluminum electrolytic capacitor is completed, and feeding is convenient.

[0020] 3、The application, start the second drive cylinder, the piston end of the second drive cylinder rises with the jacking rod, the first through hole of the jacking rod enters the second through hole, the aluminum electrolytic capacitor is jacked up, and the aluminum electrolytic capacitor is conveniently discharged. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A first perspective three-dimensional structure schematic view of a multi-stage negative pressure permeation type aluminum electrolytic capacitor liquid injection equipment is provided.

[0022] Figure 2 A second perspective three-dimensional structure schematic view of a multi-stage negative pressure permeation type aluminum electrolytic capacitor liquid injection equipment is provided.

[0023] Figure 3 A third perspective three-dimensional structure schematic view of a multi-stage negative pressure permeation type aluminum electrolytic capacitor liquid injection equipment is provided.

[0024] Figure 4 A side view of a multi-stage negative pressure permeation type aluminum electrolytic capacitor liquid injection equipment is provided.

[0025] Figure 5 A top view of a multi-stage negative pressure permeation type aluminum electrolytic capacitor liquid injection equipment is provided.

[0026] Figure 6 A liquid injection cylinder internal structure schematic view of a multi-stage negative pressure permeation type aluminum electrolytic capacitor liquid injection equipment is provided.

[0027] 1, a liquid injection operation platform; 2, a fixed stand; 3, a material swinging rotary disc; 4, a rotary fixed gear ring; 5, a first mounting frame; 6, a servo motor; 7, a rotary drive gear; 8, an upper horizontal mounting plate; 9, a supporting mounting stand; 10, an electrolyte storage tank; 11, a liquid pumping pump body; 12, a first liquid pumping pipeline; 13, a second liquid pumping pipeline; 14, a first connecting hose; 15, a first drive cylinder; 16, a liquid injection cylinder; 17, a permeation membrane; 18, a liquid injection pipeline; 19, a liquid injection valve; 20, a connecting mounting seat; 21, an air pumping pump body; 22, a first air pumping pipeline; 23, a second connecting hose; 24, a second mounting frame; 25, a second drive cylinder; 26, a first through hole; 27, a placing groove; 28, a second through hole. DETAILED DESCRIPTION

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example:

[0030] like Figures 1-6 As shown, this embodiment of the invention provides a multi-stage negative pressure permeation type aluminum electrolytic capacitor liquid injection device, including an injection operation table 1. A fixed column 2 is fixedly connected to the upper surface of the injection operation table 1. A material-lifting rotating disk 3 is rotatably connected to the outer surface of the fixed column 2. A power component for driving the material-lifting rotating disk 3 to rotate is installed on the lower surface of the injection operation table 1. The power component includes a first mounting bracket 5 fixedly connected to the lower surface of the injection operation table 1. A servo motor 6 is fixedly connected to the lower surface of the first mounting bracket 5. A first connecting shaft is fixedly connected to the output shaft of the servo motor 6. A rotary drive gear 7 is fixedly connected to the end of the first connecting shaft away from the servo motor 6. A rotary fixed gear ring 4 is fixedly connected to the outer surface of the material-lifting rotating disk 3. The rotary drive gear 7 and the rotary fixed gear ring 4 are meshed and connected.

[0031] A horizontal mounting plate 8 is fixedly connected to the top of the fixed column 2. A supporting mounting column 9 is fixedly connected to one side of the upper surface of the upper horizontal mounting plate 8. An electrolyte storage tank 10 is fixedly connected to the top of the supporting mounting column 9. An injection cylinder 16 is connected to the other side of the upper surface of the upper horizontal mounting plate 8 through a lifting assembly. An injection pipe 18 is fixedly connected to the bottom of the injection cylinder 16. An injection valve 19 is installed on the outer surface of the injection pipe 18. The lifting assembly includes a first driving cylinder 15 fixedly connected to the upper surface of the upper horizontal mounting plate 8. A second connecting shaft is fixedly connected to the piston end of the first driving cylinder 15. The end of the second connecting shaft away from the first driving cylinder 15 is fixedly connected to the top of the injection cylinder 16. When the first driving cylinder 15 is activated, the piston end of the first driving cylinder 15 descends with the second connecting shaft. The second connecting shaft descends with the injection cylinder 16, causing the injection pipe 18 to descend to the injection position.

[0032] The inside of the liquid injection cylinder 16 is fixedly provided with three permeable membranes 17, the upper surface of the upper horizontal mounting plate 8 is provided with a liquid supply assembly connected with the liquid injection cylinder 16, the liquid supply assembly comprises a liquid pumping body 11 fixedly connected to the upper surface of the upper horizontal mounting plate 8, the inlet of the liquid pumping body 11 is fixedly connected with a first liquid pumping pipeline 12, the first liquid pumping pipeline 12 is fixedly connected with the side wall of the electrolyte storage tank 10 at the end away from the liquid pumping body 11, the outlet of the liquid pumping body 11 is fixedly connected with a second liquid pumping pipeline 13, the second liquid pumping pipeline 13 is fixedly connected with a first connecting hose 14 at the end away from the liquid pumping body 11, and the first connecting hose 14 is fixedly connected with the liquid injection cylinder 16 at the end away from the second liquid pumping pipeline 13; when the liquid pumping body 11 is started, the liquid pumping body 11 draws the electrolyte in the electrolyte storage tank 10 through the first liquid pumping pipeline 12, then the electrolyte enters the inside of the second liquid pumping pipeline 13, and then enters the first connecting hose 14 through the second liquid pumping pipeline 13, and finally enters the inside of the liquid injection cylinder 16 through the first connecting hose 14;

[0033] The side of the upper horizontal mounting plate 8 is connected with an air pumping assembly connected with the liquid injection cylinder 16, the air pumping assembly comprises a connecting mounting seat 20 fixedly connected to the side of the upper horizontal mounting plate 8, the upper surface of the connecting mounting seat 20 is fixedly connected with an air pumping body 21, the inlet of the air pumping body 21 is fixedly connected with a first air pumping pipeline 22, the first air pumping pipeline 22 is fixedly connected with a second connecting hose 23 at the end away from the air pumping body 21, the second connecting hose 23 is fixedly connected with the liquid injection cylinder 16 at the end away from the first air pumping pipeline 22, and the outlet of the air pumping body 21 is fixedly connected with a second air pumping pipeline; when the air pumping body 21 is started, the air pumping body 21 draws part of the air in the liquid injection cylinder 16 through the first air pumping pipeline 22 and the second connecting hose 23, so that a negative pressure state is formed in the inside of the liquid injection cylinder 16;

[0034] The lower surface of the liquid injection operation table 1 is provided with a jacking assembly, the jacking assembly comprises a second mounting frame 24 fixedly connected to the lower surface of the liquid injection operation table 1, the lower surface of the second mounting frame 24 is fixedly connected with a second drive cylinder 25, the piston end of the second drive cylinder 25 is fixedly connected with a jacking rod, the surface of the liquid injection operation table 1 is provided with a first through hole 26, the jacking rod is matched with the first through hole 26, the upper surface of the material placing rotary disc 3 is provided with a plurality of placing grooves 27, the inside of the placing groove 27 is provided with a second through hole 28, the second through hole 28 is matched with the first through hole 26, and the second drive cylinder 25 is started; the piston end of the second drive cylinder 25 carries the jacking rod to rise, the jacking rod enters the second through hole 28 through the first through hole 26, the aluminum electrolytic capacitor is jacked up, and the aluminum electrolytic capacitor is conveniently discharged.

[0035] Working principle:

[0036] When in use, the aluminum electrolytic capacitor is sequentially placed into the placing slot 27 on the upper surface of the material placing rotary disc 3. Before starting the liquid injection, the air extraction pump body 21 is started first. The air extraction pump body 21 extracts part of the air in the liquid injection cylinder body 16 through the first air extraction pipeline 22 and the second connecting hose 23, so that the inside of the liquid injection cylinder body 16 forms a negative pressure state.

[0037] Then the first driving air cylinder 15 is started. The piston end of the first driving air cylinder 15 descends with the second connecting shaft, the second connecting shaft descends with the liquid injection cylinder body 16, so that the liquid injection pipeline 18 descends to the liquid injection position. Then the liquid extraction pump body 11 is started. The liquid extraction pump body 11 extracts the electrolyte in the electrolyte storage tank 10 through the first liquid extraction pipeline 12. Then the electrolyte enters into the second liquid extraction pipeline 13, and then enters into the first connecting hose 14 through the second liquid extraction pipeline 13, and then enters into the inside of the liquid injection cylinder body 16 through the first connecting hose 14. The liquid injection valve 19 on the liquid injection pipeline 18 is opened. The electrolyte in the liquid injection cylinder body 16 slowly penetrates downwards through the multi-stage permeation membrane 17, and finally enters into the aluminum electrolytic capacitor through the liquid injection pipeline 18.

[0038] The servo motor 6 is started. The output shaft of the servo motor 6 rotates with the first connecting shaft. The first connecting shaft rotates with the rotary driving gear 7. The rotary driving gear 7 rotates with the rotary fixed gear ring 4. The rotary fixed gear ring 4 rotates with the material placing rotary disc 3. Another aluminum electrolytic capacitor is rotated to the lower side of the liquid injection cylinder body 16. The above operation is repeated to complete the liquid injection operation of another aluminum electrolytic capacitor.

[0039] When the aluminum electrolytic capacitor after the liquid injection is rotated to the position of the first through hole 26, the second driving air cylinder 25 is started. The piston end of the second driving air cylinder 25 ascends with the jacking rod. The jacking rod enters into the second through hole 28 through the first through hole 26. The aluminum electrolytic capacitor is jacked up to facilitate the discharging of the aluminum electrolytic capacitor.

[0040] It should be noted that, in the present document, the terms such as first and second, and the like, are used merely to differentiate one entity or action from another, and do not necessarily require or imply any such actual relationship or order between such entities or actions. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by an "including a quoted phrase" does not exclude the existence of additional elements that are the same as those included in the "quoted phrase".

[0041] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection equipment comprising a liquid injection operation table (1), characterized in that: The upper surface of the liquid injection operation platform (1) is fixedly connected with a fixed column (2), the outer surface of the fixed column (2) is rotatably connected with a material swinging rotary disc (3), the lower surface of the liquid injection operation platform (1) is provided with a power assembly for driving the material swinging rotary disc (3) to rotate, the top of the fixed column (2) is fixedly connected with an upper horizontal mounting plate (8), one side of the upper surface of the upper horizontal mounting plate (8) is fixedly connected with a supporting mounting column (9), the top of the supporting mounting column (9) is fixedly connected with an electrolyte storage tank (10), the other side of the upper surface of the upper horizontal mounting plate (8) is connected with a liquid injection cylinder (16) through a lifting assembly, the inside of the liquid injection cylinder (16) is fixedly provided with three osmotic membranes (17), the upper surface of the upper horizontal mounting plate (8) is provided with a liquid supply assembly connected with the liquid injection cylinder (16), one side of the upper horizontal mounting plate (8) is connected with an air extraction assembly connected with the liquid injection cylinder (16), and the lower surface of the liquid injection operation platform (1) is provided with a jacking assembly.

2. The multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection apparatus according to claim 1, characterized by: The power assembly comprises a first mounting frame (5) fixedly connected to the lower surface of the liquid injection operation platform (1), a servo motor (6) fixedly connected to the lower surface of the first mounting frame (5), a first connecting shaft fixedly connected to the output shaft of the servo motor (6), a rotary drive gear (7) fixedly connected to one end of the first connecting shaft away from the servo motor (6), and a rotary fixed gear ring (4) fixedly connected to the outer surface of the material swinging rotary disc (3), wherein the rotary drive gear (7) is in meshing connection with the rotary fixed gear ring (4).

3. The multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection apparatus according to claim 1, characterized by: The lifting assembly comprises a first drive cylinder (15) fixedly connected to the upper surface of the upper horizontal mounting plate (8), a second connecting shaft fixedly connected to the piston end of the first drive cylinder (15), and the top of the liquid injection cylinder (16) is fixedly connected to one end of the second connecting shaft away from the first drive cylinder (15).

4. The multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection apparatus according to claim 1, characterized by: The liquid supply assembly comprises a liquid pumping body (11) fixedly connected to the upper surface of the upper horizontal mounting plate (8), a first liquid pumping pipeline (12) fixedly connected to the inlet of the liquid pumping body (11), a side wall of the electrolyte storage tank (10) fixedly connected to one end of the first liquid pumping pipeline (12) away from the liquid pumping body (11), a second liquid pumping pipeline (13) fixedly connected to the outlet of the liquid pumping body (11), a first connecting hose (14) fixedly connected to one end of the second liquid pumping pipeline (13) away from the liquid pumping body (11), and the liquid injection cylinder (16) fixedly connected to one end of the first connecting hose (14) away from the second liquid pumping pipeline (13).

5. The multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection apparatus according to claim 1, characterized by: The air extraction assembly includes a connecting mounting base (20) fixedly connected to one side of the upper horizontal mounting plate (8), the upper surface of the connecting mounting base (20) is fixedly connected with an air extraction pump body (21), the inlet of the air extraction pump body (21) is fixedly connected with a first air extraction pipeline (22), the end of the first air extraction pipeline (22) away from the air extraction pump body (21) is fixedly connected with a second connecting hose (23), the end of the second connecting hose (23) away from the first air extraction pipeline (22) is fixedly connected with the liquid injection cylinder (16), and the outlet of the air extraction pump body (21) is fixedly connected with a second air extraction pipeline.

6. The multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection apparatus according to claim 1, characterized by: The jacking assembly includes a second mounting frame (24) fixedly connected to the lower surface of the liquid injection operation table (1), the lower surface of the second mounting frame (24) is fixedly connected with a second drive air cylinder (25), the piston end of the second drive air cylinder (25) is fixedly connected with a jacking rod, the surface of the liquid injection operation table (1) is provided with a first through hole (26), and the jacking rod is matched with the first through hole (26).

7. The multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection apparatus according to claim 6, characterized by: The upper surface of the material placing rotary disc (3) is provided with a plurality of placing grooves (27), the inside of the placing groove (27) is provided with a second through hole (28), and the second through hole (28) is matched with the first through hole (26).

8. The multi-stage negative pressure infiltration type aluminum electrolytic capacitor liquid injection apparatus according to claim 1, characterized by: The bottom of the liquid injection cylinder (16) is fixedly connected with a liquid injection pipeline (18), and the outer surface of the liquid injection pipeline (18) is provided with a liquid injection valve (19).

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