Switching liquid supply system

Abstract

The utility model discloses a switching liquid supply system which comprises an air source device, a first liquid storage tank, a second liquid storage tank and a liquid spraying device. A first switching gas circuit is connected between the gas source device and the first liquid storage tank, a first switching switch valve is arranged on the first switching gas circuit, a second switching gas circuit is connected between the gas source device and the second liquid storage tank, and a second switching switch valve is arranged on the second switching gas circuit; a first liquid supply pipeline is arranged between the first liquid storage tank and the liquid spraying device, and a second liquid supply pipeline is arranged between the second liquid storage tank and the liquid spraying device. When the spinning liquid in the first liquid storage tank is used up, the second change-over switch valve and the second liquid supply switch valve are opened, liquid supply air pressure enters the second liquid storage tank to press the spinning liquid to the liquid spraying device, then the first change-over switch valve and the first liquid supply switch valve are closed, and the spinning liquid in the second liquid storage tank can be switched to be used. Therefore, continuous supply of the spinning solution in the liquid spraying device is kept, the liquid spraying device is basically filled with the spinning solution, and the spinning uniformity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrostatic spinning, in particular to a switching liquid supply system. Background Art

[0002] During the electrospinning process, spinning liquid needs to be supplied to the nozzle. Some existing liquid supply methods are to store the spinning liquid in a liquid storage tank, and then introduce air pressure into the liquid storage tank. Under the action of air pressure, the spinning liquid is pressed toward the spinneret and multiple nozzles. The amount of spinning liquid in the liquid storage tank will gradually decrease with production and use. When the spinning liquid is used up, new spinning liquid needs to be added to the liquid storage tank.

[0003] However, when replenishing the spinning solution, the pressure in the liquid storage tank, piping, and nozzle must first be released. Furthermore, the solution at the nozzle drips downward under the action of gravity, causing air to enter the liquid-filled liquid chamber in the spinneret, forming a cavity. When the liquid supply is restarted after the liquid storage tank is fully replenished, the air in the spinneret is difficult to expel from the nozzle, so the air remains in the spinneret, making it difficult to balance the liquid supply pressure and the pressure at the nozzle end, reducing the uniformity of the nozzle spray. Utility Model Content

[0004] The main purpose of this utility model is to propose a switching liquid supply system, which aims to solve the technical problem in the prior art that a cavity is formed in the spinneret when the spinning liquid is replenished to the liquid storage tank, resulting in difficulty in adjusting the balance between the liquid supply air pressure and the liquid spraying pressure when the liquid supply is started again, thereby reducing the uniformity of the liquid spraying from the nozzle.

[0005] To achieve the above-mentioned purpose, the utility model proposes a switching liquid supply system, comprising an air source device, a first liquid storage tank, a second liquid storage tank and a liquid spraying device;

[0006] The air source device is used to provide liquid supply pressure to the first liquid storage tank and the second liquid storage tank. A first switching air path is connected between the air source device and the first liquid storage tank, and a first switching switch valve is provided on the first switching air path. A second switching air path is connected between the air source device and the second liquid storage tank, and a second switching switch valve is provided on the second switching air path.

[0007] The first liquid storage tank and the second liquid storage tank are both connected to the liquid spraying device, and the first liquid storage tank and the second liquid storage tank can supply liquid to the liquid spraying device respectively. A first liquid supply pipeline is provided between the first liquid storage tank and the liquid spraying device, and a first liquid supply switch valve is provided on the first liquid supply pipeline. A second liquid supply pipeline is provided between the second liquid storage tank and the liquid spraying device, and a second liquid supply switch valve is provided on the second liquid supply pipeline.

[0008] The air source device generates liquid supply air pressure. When the spinning solution in the first liquid storage tank is used for production, the first switching switch valve and the first liquid supply switch valve are opened, and the second switching switch valve and the second liquid supply switch valve are closed. The liquid supply air pressure flows through the first switching air path into the first liquid storage tank, and presses the spinning liquid in the first liquid storage tank to the spray device and sprays it out for production; when the spinning solution in the first liquid storage tank is used up and needs to be replenished, the second switching switch valve and the second liquid supply switch valve are opened first, and the liquid supply air pressure flows through the second switching air path into the second liquid storage tank, and presses the spinning liquid in the second liquid storage tank to the spray device, and then the first switching switch valve and the first liquid supply switch valve are closed to replenish the spinning solution to the first liquid storage tank. In this way, the spray device switches to spraying the spinning solution in the second liquid storage tank, thereby achieving a continuous supply of spinning solution in the spray device when replenishing the spinning solution, basically keeping the spray device full of spinning solution, avoiding or reducing the formation of cavities in the spray device when replenishing the spinning solution, which is beneficial to improving the uniformity of spray spinning.

[0009] Preferably, the gas outlet end of the gas source device is connected to a liquid spray pressure regulating branch and a liquid filling pressure regulating branch, the liquid spray pressure regulating branch is provided with a liquid spray pressure regulating valve, and the liquid filling pressure regulating branch is provided with a liquid filling pressure regulating valve;

[0010] There are two first switching air circuits, which are respectively called a first liquid spray switching air circuit and a first liquid filling switching air circuit. The first liquid spray switching air circuit is connected between the liquid spray pressure regulating branch circuit and the first liquid storage tank, and the first liquid filling switching air circuit is connected between the liquid filling pressure regulating branch circuit and the first liquid storage tank.

[0011] The number of the second switching air circuits is two, and the two second switching air circuits are respectively called the second liquid spray switching air circuit and the second liquid filling switching air circuit. The second liquid spray switching air circuit is connected between the liquid spray pressure regulating branch and the second liquid storage tank, and the second liquid filling switching air circuit is connected between the liquid filling pressure regulating branch and the second liquid storage tank. The first liquid spray switching air circuit and the second liquid spray switching air circuit are arranged in parallel, and the first liquid filling switching air circuit and the second liquid filling switching air circuit are arranged in parallel.

[0012] The liquid supply air pressure can enter the liquid spray pressure regulating branch and the liquid filling pressure regulating branch. The air pressure entering the first liquid spray switching air circuit and the second liquid spray switching air circuit can be adjusted by the liquid spray pressure regulating valve. The air pressure entering the first liquid filling switching air circuit and the second liquid filling switching air circuit can be adjusted by the liquid filling pressure regulating valve. The air pressure regulated by the liquid spray pressure regulating valve is the air pressure used for spinning production. The air pressure regulated by the liquid filling pressure regulating valve is greater than the air pressure regulated by the liquid spray pressure regulating valve. The air pressure regulated by the liquid filling pressure regulating valve is used to quickly deliver the spinning liquid to the liquid spray device when switching the first liquid storage tank and the second liquid storage tank, thereby improving switching efficiency.

[0013] Preferably, the liquid spraying device includes a liquid separator and multiple spinnerets. The liquid inlet of the liquid separator is connected to the first liquid supply pipeline and the second liquid supply pipeline. The liquid separator is provided with multiple liquid outlets. The liquid inlets of the multiple spinnerets are connected to the multiple liquid outlets in a one-to-one correspondence. The spinnerets are connected to multiple nozzles. The spinning solution first passes through the liquid separator and then enters the multiple spinnerets respectively. From each spinneret, it is sprayed out through multiple nozzles.

[0014] Preferably, the spinneret is connected to a third pressure relief tank, and the third pressure relief tank is provided with a third pressure relief valve.

[0015] When the spinning solution is fed into the liquid separator and the spinneret before production, the third pressure relief valve is opened, and the spinning solution discharges the air in the spinneret. After the spinning solution fills the spinneret, the third pressure relief valve is closed and production can resume.

[0016] Preferably, one third pressure relief tank is connected to a plurality of the spinnerets. Multiple spinnerets are connected to one third pressure relief tank, so that the pressure in the plurality of spinnerets is the same, making the pressure and the spraying amount of the plurality of nozzles on the plurality of spinnerets more uniform.

[0017] Preferably, a first pressure relief tank is further provided on the first liquid supply pipeline, the first pressure relief tank is arranged on a side of the first liquid supply switching valve close to the first liquid storage tank, and the first pressure relief tank is provided with a first pressure relief valve; a second pressure relief tank is further provided on the second liquid supply pipeline, the second pressure relief tank is arranged on a side of the second liquid supply switching valve close to the second liquid storage tank, and the second pressure relief tank is provided with a second pressure relief valve.

[0018] During liquid filling, when the spinning liquid in the first liquid storage tank flows to the liquid spraying device, the first pressure relief valve is opened to discharge the air in the first liquid supply pipeline, and the first pressure relief valve is closed during production; when the spinning liquid in the second liquid storage tank flows to the liquid spraying device, the second pressure relief valve is opened to discharge the air in the second liquid supply pipeline, and the second pressure relief valve is closed during production to reduce the air entering the spinning seat.

[0019] Preferably, a liquid separation switch valve is provided between the spinneret and the liquid separation row. Before filling and before the spinning solution enters the spinneret before operation, the liquid separation switch valve is first closed, and the corresponding first pressure relief valve or second pressure relief valve is opened to discharge the air in the corresponding first liquid supply pipeline or second liquid supply pipeline and the liquid separation row. Then, the corresponding first pressure relief valve or second pressure relief valve is closed, and the liquid separation switch valve and the third pressure relief valve are opened. After the air in the spinneret is discharged, the third pressure relief valve is closed to discharge more air.

[0020] Preferably, the gas source device includes an air intake source and an air storage tank connected to each other, an air intake pressure regulating valve is provided between the air intake source and the air storage tank, and the air outlet end of the air storage tank is connected to the first switching air path and the second switching air path. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a structural diagram of the switching liquid supply system of the utility model.

[0023] In the figure: 11-air intake source, 12-air storage tank, 13-air intake pressure regulating valve, 2-first liquid storage tank, 21-first liquid supply pipeline, 211-first liquid supply switch valve, 22-first pressure relief tank, 221-first pressure relief valve, 3-second liquid storage tank, 31-second liquid supply pipeline, 311-second liquid supply switch valve, 32-second pressure relief tank, 321-second pressure relief valve, 41-liquid separation row, 42-spinneret , 43-third pressure relief tank, 431-third pressure relief valve, 44-liquid separation switch valve, 51-first switching switch valve, 52-second switching switch valve, 53-liquid spray pressure regulating branch, 531-liquid spray pressure regulating valve, 54-liquid filling pressure regulating branch, 541-liquid filling pressure regulating valve, 55-first liquid spray switching air path, 56-first liquid filling switching air path, 57-second liquid spray switching air path, 58-second liquid filling switching air path.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, and back, the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] like Figure 1 As shown, a switching liquid supply system includes an air source device, a first liquid storage tank 2, a second liquid storage tank 3 and a liquid spraying device. Figure 1 The dotted lines in the figure represent gas paths, and the solid lines represent liquid paths.

[0029] The air source device is used to provide liquid supply air pressure to the first liquid storage tank 2 and the second liquid storage tank 3. A first switching air path is connected between the air source device and the first liquid storage tank 2, and a first switching switch valve 51 is provided on the first switching air path. A second switching air path is connected between the air source device and the second liquid storage tank 3, and a second switching switch valve 52 is provided on the second switching air path.

[0030] The first liquid storage tank 2 and the second liquid storage tank 3 are both connected to the liquid spraying device. The first liquid storage tank 2 and the second liquid storage tank 3 can supply liquid to the liquid spraying device respectively. A first liquid supply pipeline 21 is provided between the first liquid storage tank 2 and the liquid spraying device, and a first liquid supply switch valve 211 is provided on the first liquid supply pipeline 21. A second liquid supply pipeline 31 is provided between the second liquid storage tank 3 and the liquid spraying device, and a second liquid supply switch valve 311 is provided on the second liquid supply pipeline 31.

[0031] The air source device generates liquid supply pressure. When the spinning solution in the first liquid storage tank 2 is used for production, the first switching switch valve 51 and the first liquid supply switch valve 211 are opened, and the second switching switch valve 52 and the second liquid supply switch valve 311 are closed. The liquid supply pressure flows through the first switching air path into the first liquid storage tank 2, and the spinning pressure in the first liquid storage tank 2 is directed to the liquid spraying device and sprayed out for production; when the spinning solution in the first liquid storage tank 2 is used up and needs to be replenished, the second switching switch valve 52 and the second liquid supply switch valve 311 are opened first, and the liquid supply pressure flows through the second switching air path into the second liquid storage tank 3, and the spinning pressure in the second liquid storage tank 3 is directed to the liquid spraying device, and then the first switching switch valve 51 and the first liquid supply switch valve 211 are closed to replenish the spinning solution to the first liquid storage tank 2, so that the liquid spraying device switches to spraying the spinning solution in the second liquid storage tank 3; conversely, when the spinning solution in the second liquid storage tank 3 is used up and needs to be replenished, , first open the first switching switch valve 51 and the first liquid supply switch valve 211, the liquid supply air pressure flows through the first switching air path into the first liquid storage tank 2, and presses the spinning liquid in the first liquid storage tank 2 to the spray device, and then close the second switching switch valve 52 and the second liquid supply switch valve 311 to replenish the second liquid storage tank 3 with spinning liquid, so that the spray device is switched to spraying the spinning liquid in the first liquid storage tank 2; in this way, the first liquid storage tank 2 and the second liquid storage tank 3 are alternately switched to produce and replenish the spinning liquid. The first liquid storage tank 2 and the second liquid storage tank 3 can also be the first liquid storage tank 2 mainly used for production use, and the second liquid storage tank 3 is used to briefly supply spinning liquid when the first liquid storage tank 2 replenishes the solution, so that the continuous supply of spinning liquid in the spray device can be maintained when replenishing the spinning liquid, and the spray device is basically kept full of spinning liquid, avoiding or reducing the formation of cavities in the spray device when replenishing the spinning liquid, which is beneficial to improving the uniformity of spray spinning.

[0032] In some specific embodiments, the gas outlet of the gas source device is connected to a liquid spraying pressure regulating branch 53 and a liquid filling pressure regulating branch 54, the liquid spraying pressure regulating branch 53 is provided with a liquid spraying pressure regulating valve 531, and the liquid filling pressure regulating branch 54 is provided with a liquid filling pressure regulating valve 541;

[0033] There are two first switching air paths, which are respectively called the first liquid spray switching air path 55 and the first liquid filling switching air path 56. The first liquid spray switching air path 55 is connected between the liquid spray pressure regulating branch path 53 and the first liquid storage tank 2, and the first liquid filling switching air path 56 is connected between the liquid filling pressure regulating branch path 54 and the first liquid storage tank 2.

[0034] There are two second switching air circuits, which are respectively called the second liquid spray switching air circuit 57 and the second liquid filling switching air circuit 58. The second liquid spray switching air circuit 57 is connected between the liquid spray pressure regulating branch 53 and the second liquid storage tank 3, and the second liquid filling switching air circuit 58 is connected between the liquid filling pressure regulating branch 54 and the second liquid storage tank 3. The first liquid spray switching air circuit 55 and the second liquid spray switching air circuit 57 are arranged in parallel, and the first liquid filling switching air circuit 56 and the second liquid filling switching air circuit 58 are arranged in parallel.

[0035] The liquid supply air pressure can enter the liquid spray pressure regulating branch 53 and the liquid filling pressure regulating branch 54. The air pressure entering the first liquid spray switching air path 55 and the second liquid spray switching air path 57 can be adjusted through the liquid spray pressure regulating valve 531. The air pressure entering the first liquid filling switching air path 56 and the second liquid filling switching air path 58 can be adjusted through the liquid filling pressure regulating valve 541. The air pressure regulated by the liquid spray pressure regulating valve 531 is the air pressure used for spinning production. The air pressure regulated by the liquid filling pressure regulating valve 541 is greater than the air pressure regulated by the liquid spray pressure regulating valve 531. The air pressure regulated by the liquid filling pressure regulating valve 541 is used to quickly deliver the spinning liquid to the liquid spray device when switching the first liquid storage tank 2 and the second liquid storage tank 3, thereby improving the switching efficiency.

[0036] Taking the switch from the first liquid storage tank 2 to the second liquid storage tank 3 as an example, the specific operation is as follows: when using the spinning solution in the first liquid storage tank 2 for production, the first switching switch valve 51 on the first liquid spray switching air path 55 is opened, and the second switching switch valve 52 on the second liquid spray switching air path 57, the first switching switch valve 51 on the first liquid filling switching air path 56 and the second switching switch valve 52 on the second liquid filling switching air path 58 are all closed.

[0037] When the spinning liquid in the first liquid storage tank 2 is used up and it is necessary to switch to the spinning liquid in the second liquid storage tank 3, first open the second switching valve 52 of the second liquid filling switching air path 58, and the high-pressure air pressure causes the spinning liquid in the second liquid storage tank 3 to be quickly replenished to the second liquid supply pipeline 31; then close the first liquid supply switching valve 211, open the second liquid supply switching valve 311, close the first switching valve 51 on the first liquid spray switching air path 55, the second switching valve 52 on the second liquid filling switching air path 58, and open the second switching valve 52 on the second liquid spray switching air path 57, and then switch to using the spinning liquid in the second liquid storage tank 3. The spinning liquid in the second liquid storage tank 3 is supplied to the liquid spray device for production under normal working air pressure.

[0038] In some specific embodiments, the liquid spraying device includes a liquid separator 41 and multiple spinnerets 42. The liquid inlet of the liquid separator 41 is connected to the first liquid supply line 21 and the second liquid supply line 31. The liquid separator 41 is provided with multiple liquid outlets. The liquid inlets of the multiple spinnerets 42 are connected to the multiple liquid outlets in a one-to-one correspondence. The spinnerets 42 are connected to multiple nozzles. The spinning solution first passes through the liquid separator 41 and then enters the multiple spinnerets 42. From each spinneret 42, it is sprayed out through multiple nozzles.

[0039] Furthermore, a third pressure relief tank 43 is connected to the spinneret 42 , and a third pressure relief valve 431 is provided on the third pressure relief tank 43 .

[0040] When the spinning liquid is fed into the liquid separator 41 and the spinneret 42 before production, the third pressure relief valve 431 is opened, and the spinning liquid discharges the air in the spinneret 42. After the spinning liquid fills the spinneret 42, the third pressure relief valve 431 is closed and production can be resumed.

[0041] Furthermore, a third pressure relief tank 43 is connected to the plurality of spinnerets 42. The plurality of spinnerets 42 are connected to a third pressure relief tank 43, so that the pressure in the plurality of spinnerets 42 is the same, making the pressure and the spraying amount of the plurality of nozzles on the plurality of spinnerets 42 more uniform.

[0042] Furthermore, a first pressure relief tank 22 is provided on the first liquid supply pipeline 21, and the first pressure relief tank 22 is arranged on the side of the first liquid supply switching valve 211 close to the first liquid storage tank 2, and a first pressure relief valve 221 is provided on the first pressure relief tank 22; a second pressure relief tank 32 is also provided on the second liquid supply pipeline 31, and the second pressure relief tank 32 is arranged on the side of the second liquid supply switching valve 311 close to the second liquid storage tank 3, and a second pressure relief valve 321 is provided on the second pressure relief tank 32.

[0043] During liquid filling, when the spinning liquid in the first liquid storage tank 2 flows to the liquid spraying device, the first pressure relief valve 221 is opened to discharge the air in the first liquid supply pipeline 21, and the first pressure relief valve 221 is closed during production; when the spinning liquid in the second liquid storage tank 3 flows to the liquid spraying device, the second pressure relief valve 321 is opened to discharge the air in the second liquid supply pipeline 31, and the second pressure relief valve 321 is closed during production to reduce the air entering the spinning seat.

[0044] Furthermore, a liquid separation switch valve 44 is provided between the spinneret 42 and the liquid separation row 41. Before the liquid is filled and the spinning solution enters the spinneret 42 before operation, the liquid separation switch valve 44 is first closed, and the corresponding first pressure relief valve 221 or second pressure relief valve 321 is opened to discharge the air in the corresponding first liquid supply line 21 or second liquid supply line 31 and the liquid separation row 41. Then, the corresponding first pressure relief valve 221 or second pressure relief valve 321 is closed, and the liquid separation switch valve 44 and the third pressure relief valve 431 are opened. After the air in the spinneret 42 is discharged, the third pressure relief valve 431 is closed to discharge more air.

[0045] In some specific embodiments, the gas source device includes an air inlet source 11 and an air storage tank 12, each connected to the other. An air inlet pressure regulating valve 13 is disposed between the air inlet source 11 and the air storage tank 12. The outlet of the air storage tank 12 is connected to a first switching air path and a second switching air path. Air is introduced through the air inlet source 11, adjusted to a desired pressure by the air inlet pressure regulating valve 13, and then stored in the air storage tank 12, thereby providing a continuous and constant pressure during production.

[0046] The startup and liquid replacement steps of this liquid supply switching system are as follows:

[0047] Startup steps:

[0048] Start the gas source device, open the air inlet pressure regulating valve 13 after setting the value, adjust the air pressure value to the required working pressure, and perform quantitative gas storage;

[0049] Prepare the first liquid storage tank 2 and the second liquid storage tank 3. In this embodiment, the first liquid storage tank 2 is used to supply liquid.

[0050] Set the pressure values of the liquid filling pressure regulating valve 541 and the liquid spraying pressure regulating valve 531. The liquid filling pressure regulating valve 541 is set to a high pressure value for quickly filling the solution; the liquid spraying pressure regulating valve 531 is set to a normal production pressure value for formal spinning.

[0051] Open the first switching valve 51 and the first liquid supply switching valve 211 of the first liquid filling switching gas path 56 to transfer the solution from the first liquid storage tank 2 to the liquid separation drain 41. At this time, it is necessary to open the first pressure relief valve 221 to empty the gas bubbles in the pipeline from the first liquid storage tank 2 to the liquid separation drain 41.

[0052] When the solution is observed to flow to the liquid separation switch valve 44, the first pressure relief valve 221 is closed first and then the liquid separation switch valve 44 is opened, and the solution begins to flow to the spinneret 42. At the same time, the third pressure relief valve 431 is opened to prevent gas cavitation in the pipeline from the liquid separation switch valve 44 to the spinneret 42.

[0053] When solution emerges from the third pressure relief tank 43, close the third pressure relief valve 431, close the first switching valve 51 of the first liquid filling switching gas path 56, open the first switching valve 51 of the first liquid spraying switching gas path 55, turn on the high voltage power supply, and start formal production.

[0054] Medium change steps:

[0055] Turn off the high-voltage power supply, open the second switching valve 52 of the second liquid filling switching gas circuit 58, and transfer the solution from the second liquid storage tank 3 to the second liquid supply switching valve 311. At this time, it is necessary to open the second pressure relief valve 321 to empty the gas bubbles in the pipeline from the second liquid storage tank 3 to the second liquid supply switching valve 311.

[0056] When the solution is observed to flow to the second liquid supply switch valve 311, the first liquid supply switch valve 211 is closed, the second liquid supply switch valve 311 is opened, the first switch switch valve 51 of the first liquid spray switching gas path 55 is closed, the second switch switch valve 52 of the second liquid filling switching gas path 58 is closed, and the second switch switch valve 52 of the second liquid spray switching gas path 57 is opened. The spinning solution supply tank is successfully transferred from the first liquid storage tank 2 to the second liquid storage tank 3.

[0057] The first liquid storage tank 2 is depressurized, the first liquid storage tank 2 is removed, the high-voltage power supply is turned on, and production is continued; liquid is added to the first liquid storage tank 2 in preparation for the next material change.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A switching liquid supply system, characterized in that: It comprises an air source device, a first liquid storage tank (2), a second liquid storage tank (3) and a liquid spraying device; The air source device is used to provide liquid supply pressure to the first liquid storage tank (2) and the second liquid storage tank (3); a first switching air path is connected between the air source device and the first liquid storage tank (2); a first switching switch valve (51) is provided on the first switching air path; a second switching air path is connected between the air source device and the second liquid storage tank (3); a second switching switch valve (52) is provided on the second switching air path; The first liquid storage tank (2) and the second liquid storage tank (3) are both connected to the liquid spraying device. The first liquid storage tank (2) and the second liquid storage tank (3) can respectively supply liquid to the liquid spraying device. A first liquid supply pipeline (21) is provided between the first liquid storage tank (2) and the liquid spraying device, and a first liquid supply switch valve (211) is provided on the first liquid supply pipeline (21). A second liquid supply pipeline (31) is provided between the second liquid storage tank (3) and the liquid spraying device, and a second liquid supply switch valve (311) is provided on the second liquid supply pipeline (31).

2. The switching liquid supply system according to claim 1, characterized in that: The gas outlet end of the gas source device is connected to a liquid spraying pressure regulating branch (53) and a liquid filling pressure regulating branch (54); the liquid spraying pressure regulating branch (53) is provided with a liquid spraying pressure regulating valve (531), and the liquid filling pressure regulating branch (54) is provided with a liquid filling pressure regulating valve (541); The number of the first switching air paths is two, and the two first switching air paths are respectively called a first liquid spray switching air path (55) and a first liquid filling switching air path (56). The first liquid spray switching air path (55) is connected between the liquid spray pressure regulating branch path (53) and the first liquid storage tank (2), and the first liquid filling switching air path (56) is connected between the liquid filling pressure regulating branch path (54) and the first liquid storage tank (2). The number of the second switching air circuits is two, and the two second switching air circuits are respectively called the second liquid spray switching air circuit (57) and the second liquid filling switching air circuit (58). The second liquid spray switching air circuit (57) is connected between the liquid spray pressure regulating branch circuit (53) and the second liquid storage tank (3), and the second liquid filling switching air circuit (58) is connected between the liquid filling pressure regulating branch circuit (54) and the second liquid storage tank (3). The first liquid spray switching air circuit (55) and the second liquid spray switching air circuit (57) are arranged in parallel, and the first liquid filling switching air circuit (56) and the second liquid filling switching air circuit (58) are arranged in parallel.

3. The switching liquid supply system according to claim 1, characterized in that: The liquid spraying device comprises a liquid separation row (41) and a plurality of spinnerets (42), wherein the liquid inlet end of the liquid separation row (41) is connected to the first liquid supply pipeline (21) and the second liquid supply pipeline (31), the liquid separation row (41) is provided with a plurality of liquid outlets, the liquid inlet ends of the plurality of spinnerets (42) are connected to the plurality of liquid outlets in a one-to-one correspondence, and the spinneret (42) is connected to a plurality of nozzles.

4. The switching liquid supply system according to claim 3, characterized in that: The spinneret (42) is connected to a third pressure relief tank (43), and the third pressure relief tank (43) is provided with a third pressure relief valve (431).

5. The switching liquid supply system according to claim 4, characterized in that: One of the third pressure relief tanks (43) is connected to a plurality of the spinnerets (42).

6. The switching liquid supply system according to claim 4, characterized in that: A first pressure relief tank (22) is also provided on the first liquid supply pipeline (21). The first pressure relief tank (22) is provided on a side of the first liquid supply switch valve (211) close to the first liquid storage tank (2). A first pressure relief valve (221) is provided on the first pressure relief tank (22). A second pressure relief tank (32) is also provided on the second liquid supply pipeline (31). The second pressure relief tank (32) is arranged on a side of the second liquid supply switch valve (311) close to the second liquid storage tank (3). A second pressure relief valve (321) is provided on the second pressure relief tank (32).

7. The switching liquid supply system according to claim 6, characterized in that: A liquid separation switch valve (44) is provided between the spinneret (42) and the liquid separation row (41).

8. The switching liquid supply system according to claim 1, wherein: The gas source device comprises an air intake source (11) and an air storage tank (12) connected to each other, an air intake pressure regulating valve (13) is provided between the air intake source (11) and the air storage tank (12), and an air outlet end of the air storage tank (12) is connected to the first switching air path and the second switching air path.

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