Liquid delivery system

Abstract

The utility model relates to a liquid conveying system which comprises at least two liquid storage tanks, a liquid outlet mechanism and a pressurizing mechanism. The liquid outlet mechanism is connected with the at least two liquid storage tanks, the liquid outlet mechanism is provided with a liquid outlet end, the at least two liquid storage tanks can alternately communicate with the liquid outlet end and the pressurizing mechanism, and the pressurizing mechanism can input compressed gas into the liquid storage tanks communicating with the pressurizing mechanism so that liquid in the liquid storage tanks can be discharged through the liquid outlet ends communicating with the liquid storage tanks. Firstly, the pressurizing mechanism and the liquid outlet end are communicated with the same liquid storage tank, and the pressurizing mechanism inputs compressed gas into the liquid storage tank so as to press liquid in the liquid storage tank into the liquid outlet mechanism and discharge the liquid from the liquid outlet end. When the liquid in the liquid storage tank is used up or is about to be used up, the pressurizing mechanism and the liquid outlet end are connected with the other liquid storage tank, and the liquid in the other liquid storage tank is output. In the liquid output process of the other liquid storage tank, liquid can be supplemented into the previous liquid storage tank. In this way, constant-pressure and continuous conveying of liquid can be achieved.

Description

Technical Field

[0001] The present application belongs to the field of liquid delivery technology, and in particular, relates to a liquid delivery system. Background Art

[0002] In the field of liquid transportation, centrifugal pumps, peristaltic pumps or diaphragm pumps are usually used to provide driving pressure for liquid transportation so that the flow rate of liquid transportation is stable. However, in some cases, it is necessary to ensure the stability of the pressure of liquid transportation. If the above-mentioned driving parts are used to directly transport liquids, centrifugal pumps and peristaltic pumps will cause certain damage to the substances in the liquid; peristaltic pumps and diaphragm pumps will produce pressure pulses when working, making it difficult to achieve constant pressure. In addition, the constant pressure working range of the three is small, especially in the low-pressure working range, the pump speed is low, and it is difficult to achieve, which can easily cause unstable system pressure.

[0003] Therefore, when liquid constant pressure delivery is required, gas-driven liquid delivery is usually used, and the constant pressure working range of gas-driven liquid delivery is large and the pressure is relatively stable. However, the existing gas-driven liquid delivery equipment cannot deliver liquid continuously, which affects the delivery efficiency. Utility Model Content

[0004] The technical problem to be solved by the present application is that the existing conveying equipment cannot deliver continuously, and a liquid conveying system that can deliver continuously and improve the delivery efficiency is provided.

[0005] The technical solution proposed in this application is:

[0006] A liquid delivery system, comprising:

[0007] At least two fluid storage tanks;

[0008] A liquid outlet mechanism connected to at least two of the liquid storage tanks, wherein the liquid outlet mechanism has a liquid outlet end, and at least two of the liquid storage tanks can be alternately connected to the liquid outlet end;

[0009] A pressurizing mechanism, wherein at least two of the liquid storage tanks can be alternately connected to the pressurizing mechanism, and the pressurizing mechanism can input compressed gas into the liquid storage tanks connected thereto, so that the liquid in the liquid storage tanks is discharged through the liquid outlet ends connected to the liquid storage tanks;

[0010] The temperature regulating mechanism is used to regulate the temperature of the liquid in at least two of the liquid storage tanks.

[0011] Furthermore, the temperature regulating mechanism includes a heating pool and a heating element, the heating pool stores a heating medium, at least two liquid storage tanks are arranged in the heating pool, and the liquid storage tanks are at least partially immersed in the heating medium, and the heating element is arranged in the heating pool.

[0012] Furthermore, the temperature regulating mechanism also includes a temperature detector, and the temperature detector is arranged in the heating pool.

[0013] Furthermore, the pressurizing mechanism includes an air source and at least two groups of air intake components connected to the air source, and each of the air intake components is connected to a corresponding one of the liquid storage tanks to connect or cut off the air source and the liquid storage tank.

[0014] Furthermore, the air intake assembly includes an air intake pipe and an air intake valve, two ends of the air intake pipe are respectively connected to the air source and the liquid storage tank, and the air intake valve is arranged on the air intake pipe.

[0015] Furthermore, the air intake assembly also includes a pressure reducing valve and a pressure detector, the pressure reducing valve and the pressure detector are both arranged in the air intake pipe, and the pressure detector is arranged between the pressure reducing valve and the liquid storage tank.

[0016] Furthermore, the liquid discharge mechanism includes a liquid collecting pipe and at least two connecting pipes, one end of the at least two connecting pipes is connected to at least two liquid storage tanks one by one, and the other end is connected to the liquid collecting pipe, and the liquid collecting pipe is provided with a liquid outlet for liquid discharge;

[0017] The liquid outlet mechanism further includes at least two liquid outlet valves, and each of the liquid outlet valves is correspondingly arranged on one of the connecting pipes.

[0018] Furthermore, the liquid outlet mechanism also includes a liquid outlet head, one end of which is connected to the liquid collecting pipe and communicated with the liquid outlet.

[0019] Furthermore, it also includes a liquid supply mechanism and at least two exhaust mechanisms, at least two of the liquid storage tanks can be alternately connected to the liquid supply mechanism, and the liquid supply mechanism can input liquid into the liquid storage tanks connected thereto; each of the exhaust mechanisms is connected to a corresponding one of the liquid storage tanks.

[0020] Furthermore, the liquid supply mechanism includes a liquid source, at least two liquid supply pipes and at least two liquid supply valves, both ends of each of the liquid supply pipes are respectively connected to the liquid source and a corresponding liquid storage tank, and each of the liquid supply valves is arranged on a corresponding liquid supply pipe.

[0021] Using the above-mentioned liquid delivery system, the pressurizing mechanism and the liquid outlet are first connected to the same liquid storage tank, and the pressurizing mechanism inputs compressed gas into the liquid storage tank to press the liquid in the liquid storage tank into the liquid outlet mechanism, and discharge it from the liquid outlet connected to the liquid storage tank. When the liquid in the liquid storage tank is exhausted or about to be exhausted, the pressurizing mechanism and the liquid outlet are connected to another liquid storage tank, and the liquid in the other liquid storage tank is output. During the process of outputting liquid from another liquid storage tank, liquid can be added to the previously emptied liquid storage tank, and then the above-mentioned actions can be repeated. In this way, constant pressure and continuous delivery of liquid can be achieved. At the same time, the temperature regulating mechanism can adjust the temperature of the liquid to ensure that the temperature of the liquid meets the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide further understanding of the present application and constitute a part of the specification. They are used to explain the present application together with the embodiments of the present application and do not constitute a limitation of the present application.

[0023] Figure 1 A schematic diagram of the principle of a liquid delivery system provided in one embodiment of the present application;

[0024] Figure 2 for Figure 1 A schematic diagram of the principles of the provided liquid delivery system without the control mechanism.

[0025] Description of labels:

[0026] 100, liquid delivery system; 111, liquid storage tank; 120, pressurizing mechanism; 130, liquid discharge mechanism; 140, temperature regulating mechanism; 121, air inlet pipe; 122, air inlet valve; 123, pressure reducing valve; 124, pressure detector; 150, liquid supply mechanism; 151, liquid supply pipe; 152, liquid supply valve; 153, liquid inlet pipe; 112, liquid level detector; 160, exhaust mechanism; 161, exhaust pipe; 162, exhaust valve; 131, connecting pipe; 132, liquid discharge valve; 133, liquid collecting pipe; 134, liquid discharge head; 141, heating pool; 142, heating element; 143, temperature detector; 170, control mechanism. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In order to facilitate understanding of the technical solution of the present application, the existing gas-driven liquid delivery equipment is described here: In the existing equipment, the liquid is usually stored in a tank, and then gas is input into the tank to press the liquid out of the tank. However, after the liquid in the tank is emptied, it is necessary to replace or add liquid, which leads to interruption of delivery and inability to continue delivery, affecting the delivery efficiency. In addition, when there are requirements for the temperature of the liquid, the temperature of the liquid in the tank will change during the placement process, resulting in the temperature of the liquid no longer meeting the requirements.

[0030] like Figure 1 As shown, an embodiment of the present application provides a liquid delivery system 100, including at least two liquid storage tanks 111, and each liquid storage tank 111 can store liquid.

[0031] Furthermore, the liquid delivery system also includes a pressurizing mechanism 120 , and at least two liquid storage tanks 111 can be alternately connected to the pressurizing mechanism 120 . The pressurizing mechanism 120 can input compressed gas into the liquid storage tanks 111 connected thereto to press out the liquid in the liquid storage tanks 111 .

[0032] The liquid delivery system further includes a liquid outlet mechanism 130, which is connected to at least two liquid storage tanks 111 and has a liquid outlet end, and at least two liquid storage tanks 111 can be alternately connected to the liquid outlet end. The pressurizing mechanism 120 presses the liquid in the liquid storage tank 111 out, so that the liquid in the liquid storage tank 111 is discharged through the liquid outlet end connected to the liquid storage tank 111.

[0033] It should be explained that at least two liquid storage tanks 111 can be alternately connected to the pressurizing mechanism 120 and the liquid outlet, that is, the pressurizing mechanism 120 and the liquid outlet can be connected to the liquid storage tanks 111, and connected to one of the liquid storage tanks 111 each time.

[0034] Furthermore, the liquid delivery system also includes a temperature regulating mechanism 140 , and the temperature regulating mechanism 140 is used to regulate the temperature of the liquid in at least two liquid storage tanks 111 .

[0035] Using the above-mentioned liquid delivery system, the pressurizing mechanism 120 and the liquid outlet are first connected to the same liquid storage tank 111, and the pressurizing mechanism 120 inputs compressed gas into the liquid storage tank 111 to press the liquid in the liquid storage tank 111 into the liquid outlet mechanism 130, and discharge it from the liquid outlet connected to the liquid storage tank 111. When the liquid in the liquid storage tank 111 is exhausted or about to be exhausted, the pressurizing mechanism 120 and the liquid outlet are connected to another liquid storage tank 111, and the liquid in the other liquid storage tank 111 is output. During the process of outputting liquid from another liquid storage tank 111, liquid can be added to the previously emptied liquid storage tank 111, and then the above-mentioned actions can be repeated. In this way, constant pressure and continuous delivery of liquid can be achieved. At the same time, the temperature regulating mechanism 140 can adjust the temperature of the liquid to ensure that the temperature of the liquid meets the requirements.

[0036] Specific to Figure 1 In the illustrated embodiment, there are two liquid storage tanks 111 , which are used alternately, and when one of the liquid storage tanks 111 is connected to the pressurizing mechanism 120 and the liquid outlet, the other liquid storage tank 111 can be replenished with liquid.

[0037] In one embodiment, the pressurizing mechanism 120 includes an air source and at least two groups of air intake components connected to the air source, each air intake component is connected to a corresponding liquid storage tank 111 to connect or disconnect the air source and the liquid storage tank 111, thereby alternately connecting at least two liquid storage tanks 111 to the air source.

[0038] It can be determined that the pressurizing mechanism 120 is connected to the liquid storage tank 111, which means that the gas source is connected to the inside of the liquid storage tank 111, so that compressed gas is input into the liquid storage tank 111. In addition, it should be noted that in this embodiment, the compressed gas is nitrogen, and in other embodiments, the compressed gas can also be other gases that have no effect on the liquid and the system, which is not limited here.

[0039] In one embodiment, the air intake assembly includes an air intake pipe 121 and an air intake valve 122. The two ends of the air intake pipe 121 are respectively connected to the air source and the liquid storage tank 111, that is, the air source and the liquid storage tank 111 are connected. The air intake valve 122 is arranged on the air intake pipe 121 to control the opening and closing of the air intake pipe 121, thereby connecting or cutting off the air source and the liquid storage tank 111.

[0040] Furthermore, the air intake assembly further includes a pressure reducing valve 123 and a pressure detector 124, both of which are arranged in the air intake pipe 121, and the pressure detector 124 is arranged between the pressure reducing valve 123 and the liquid storage tank 111. In this way, the pressure of the compressed gas delivered to the air intake pipe 121 by the air source can be adjusted by the pressure reducing valve 123, and when the air intake pipe 121 is connected to the inside of the liquid storage tank 111, the pressure in the air intake pipe 121 is the same as the pressure in the liquid storage tank 111. At the same time, the pressure detector 124 is arranged downstream of the pressure reducing valve 123, so the pressure detector 124 can detect the pressure in the liquid storage tank 111, and can adjust the pressure in the liquid storage tank 111 according to the detection result of the pressure detector 124 to achieve constant pressure delivery.

[0041] In one embodiment, the liquid delivery system further includes a liquid supply mechanism 150 , and at least two liquid storage tanks 111 can be alternately connected to the liquid supply mechanism 150 . The liquid supply mechanism 150 can input liquid into the liquid storage tanks 111 connected thereto, thereby replenishing the liquid in the liquid storage tanks 111 .

[0042] Furthermore, the liquid supply mechanism 150 includes a liquid source, at least two liquid supply pipes 151 and at least two liquid supply valves 152. The two ends of each liquid supply pipe 151 are respectively connected to the liquid source and a corresponding liquid storage tank 111, that is, the liquid source and the liquid storage tank 111 are connected. Each liquid supply valve 152 is arranged on the corresponding liquid supply pipe 151, which is used to control the connection and disconnection of the liquid supply pipe 151, thereby connecting or disconnecting the liquid source and the liquid storage tank 111.

[0043] Similarly, it can be known that the liquid supply mechanism 150 is connected to the liquid storage tank 111, which means that the liquid originates from the internal connection of the liquid storage tank 111 so as to transport the liquid into the liquid storage tank 111.

[0044] exist Figure 1 In the illustrated embodiment, the liquid supply mechanism 150 further includes a liquid inlet pipe 153, and one end of the two liquid supply pipes 151 away from the liquid storage tank 111 is connected to the liquid inlet pipe 153, and one end of the liquid inlet pipe 153 away from the liquid supply pipe 151 is connected to a liquid source, thereby inputting liquid into at least two liquid storage tanks 111 through one liquid source.

[0045] In one embodiment, the liquid delivery system also includes at least two liquid level detectors 112, each liquid level detector 112 is arranged in a corresponding liquid storage tank 111, and is used to detect the liquid level in the liquid storage tank 111. The liquid supply mechanism 150 can input liquid into the liquid storage tank 111 according to the detection result of the liquid level detector 112.

[0046] In one embodiment, the liquid delivery system further includes at least two exhaust mechanisms 160, each exhaust mechanism 160 is connected to a corresponding liquid storage tank 111, and is used to exhaust the gas in the liquid storage tank 111. In this way, when liquid is added to the liquid storage tank 111 through the liquid supply mechanism 150, in order to facilitate the liquid to enter the liquid storage tank 111, the gas in the liquid storage tank 111 can be exhausted through the exhaust mechanism 160.

[0047] Furthermore, the exhaust mechanism 160 includes an exhaust pipe 161 and an exhaust valve 162. The exhaust pipe 161 is connected to the liquid storage tank 111. The exhaust valve 162 is arranged on the exhaust pipe 161 to control the on and off of the exhaust pipe 161, so as to discharge the gas in the liquid storage tank 111 when the exhaust pipe 161 is on, so as to facilitate the liquid supply mechanism 150 to input liquid into the liquid storage tank 111. At the same time, the sealing of the liquid storage tank 111 can be ensured, so as to prevent foreign impurities from entering the liquid storage tank 111 and ensure the purity of the liquid. Of course, in order to further prevent foreign impurities from entering, a one-way valve can be arranged on the exhaust pipe 161.

[0048] In one embodiment, the liquid outlet mechanism 130 includes at least two connecting tubes 131 and at least two liquid outlet valves 132. One end of each connecting tube 131 is connected to the liquid storage tank 111. Each liquid outlet valve 132 is arranged on a corresponding connecting tube 131 to control the on-off of the connecting tube 131, so as to discharge the liquid in the liquid storage tank 111 when the connecting tube 131 is turned on.

[0049] Furthermore, the liquid outlet mechanism 130 further includes a liquid collecting pipe 133, and the other end of each connecting pipe 131 is connected to the liquid collecting pipe 133, and the liquid collecting pipe 133 is provided with a liquid outlet for liquid discharge. It can be understood that, in this embodiment, the liquid outlet is the above-mentioned liquid outlet end, the liquid storage tank 111 can be connected to the liquid outlet through the connecting pipe 131 and the liquid collecting pipe 133, and the liquid outlet valve 132 can control at least two liquid storage tanks 111 to be alternately connected to the liquid outlet.

[0050] Furthermore, the liquid outlet mechanism 130 further includes a liquid outlet head 134, one end of which is connected to the liquid collecting pipe 133 and communicated with the liquid outlet so that the liquid can be discharged from the liquid outlet head 134, that is, the liquid outlet head 134 is the above-mentioned liquid outlet end. Figure 1 In the illustrated embodiment, there is only one liquid outlet head 134. In other embodiments, in order to realize multi-terminal infusion, multiple liquid outlet heads 134 may be provided, and correspondingly multiple liquid outlets may be opened on the liquid collecting tube 133, and the multiple liquid outlet heads 134 correspond one-to-one to the multiple liquid outlets.

[0051] It can be confirmed that in order to ensure that the compressed gas presses the liquid out of the liquid storage tank 111 and facilitate the input of the liquid, the air inlet pipe 121 and the exhaust pipe 161 are connected to the top of the liquid storage tank 111, the connecting pipe 131 is connected to the bottom of the liquid storage tank 111, and the liquid supply pipe 151 is connected to the side of the liquid storage tank 111, and the liquid supply pipe 151 is also arranged close to the bottom of the liquid storage tank 111 to avoid splashing of liquid when entering.

[0052] In one embodiment, the temperature regulating mechanism 140 includes a heating pool 141 and a heating element 142. The heating pool 141 stores a heating medium. At least two liquid storage tanks 111 are arranged in the heating pool 141, and the liquid storage tanks 111 are at least partially immersed in the heating medium so that the liquid storage tanks 111 are heated by the heating medium, thereby regulating the temperature of the liquid in the liquid storage tanks 111; the heating element 142 is arranged in the heating pool 141, and is used to heat the heating medium in the heating pool 141.

[0053] Specifically, the heating medium may be water or oil. Heating the liquid storage tank 111 in a water bath or an oil bath can ensure heating uniformity and further ensure the stability of the temperature of the liquid in the liquid storage tank 111 .

[0054] Furthermore, the temperature adjustment mechanism 140 further includes a temperature detector 143, which is disposed in the heating pool 141 and is used to detect the temperature of the heating medium, thereby adjusting the action of the heating element 142 according to the detection result of the temperature detector 143. That is, the heating is stopped when the temperature of the heating medium reaches a preset temperature value, and the heating is performed when the temperature of the heating medium is lower than the preset temperature value.

[0055] Of course, in other embodiments, a temperature sensor may be provided on the liquid storage tank 111 to detect the temperature of the liquid in the liquid storage tank 111, so as to further ensure the accuracy of the liquid temperature control. In addition, in other embodiments, the temperature regulating mechanism 140 may also be used to cool the liquid, which is not limited here.

[0056] In one embodiment, the liquid delivery system further includes a control mechanism 170, which is electrically connected to the heating element 142 and the temperature detector 143, and is used to control the action of the heating element 142 according to the detection result of the temperature detector 143. Of course, the control mechanism 170 is also electrically connected to the electrical components in the liquid supply mechanism 150, the pressurizing mechanism 120 and the liquid outlet mechanism 130 to realize the automatic operation of the liquid delivery system.

[0057] In order to facilitate understanding of the technical solution of this application, Figure 2 The working process of the liquid delivery system in the above embodiment is described. At the same time, for the convenience of description, a and b are used to distinguish the same structure:

[0058] Initially, liquid is stored in both the liquid storage tank 111a and the liquid storage tank 111b, and the liquid is at a high liquid level, and all valves are in a closed state.

[0059] First, the liquid in the liquid storage tank 111a is transported. The air intake valve 122a on the air intake pipe 121a connected to the liquid storage tank 111a is opened, and the pressure reducing valve 123a adjusts the air intake pressure according to the detection result of the pressure detector 124a; at the same time, the liquid outlet valve 132a on the connecting pipe 131a is opened to discharge the liquid in the liquid storage tank 111a.

[0060] When the liquid level detector 112a detects that the liquid level in the liquid storage tank 111a is too low, the air intake valve 122b on the air intake pipe 121b connected to the liquid storage tank 111b is opened, and the pressure reducing valve 123b adjusts the air intake pressure according to the detection result of the pressure detector 124b; at the same time, the liquid outlet valve 132b on the connecting pipe 131b is opened to discharge the liquid in the liquid storage tank 111b. At this time, the air intake valve 122a and the liquid outlet valve 132a need to be closed to replace the liquid out of the liquid storage tank 111a with the liquid out of the liquid storage tank 111b.

[0061] During the liquid output process in the liquid storage tank 111b, the liquid supply valve 152a on the liquid supply pipe 151a is opened to allow the liquid source to input liquid into the liquid storage tank 111a; at the same time, the exhaust valve 162a on the exhaust pipe 161a is opened to facilitate the input of liquid into the liquid storage tank 111a. When the liquid level detector 112a detects that the liquid level in the liquid storage tank 111a reaches a high liquid level, the exhaust valve 162a and the liquid supply valve 152a are closed. When the liquid level detector 112b detects that the liquid level in the liquid storage tank 111b is too low, the air inlet valve 122b and the liquid outlet valve 132b are closed, and the above steps are repeated at the same time, the liquid output of the liquid storage tank 111b is replaced by the liquid output of the liquid storage tank 111a, and the liquid supply valve 152b on the liquid supply pipe 151b and the exhaust valve 162b on the exhaust pipe 161b are opened to replenish the liquid in the liquid storage tank 111b.

[0062] It should be explained that in order to avoid pressure fluctuations during the switching of the liquid discharge from the liquid storage tank 111, the liquid discharge from the liquid storage tank 111 can be delayed. In addition, during the operation, the temperature detector 143 will detect the temperature of the heating medium in real time, and the heating element 142 heats the heating medium according to the detection result of the temperature detector 143 to ensure that the liquid temperature meets the requirements.

[0063] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A liquid delivery system, characterized in that: include: At least two fluid storage tanks; A liquid outlet mechanism connected to at least two of the liquid storage tanks, wherein the liquid outlet mechanism has a liquid outlet end, and at least two of the liquid storage tanks can be alternately connected to the liquid outlet end; A pressurizing mechanism, wherein at least two of the liquid storage tanks can be alternately connected to the pressurizing mechanism, and the pressurizing mechanism can input compressed gas into the liquid storage tanks connected thereto, so that the liquid in the liquid storage tanks is discharged through the liquid outlet ends connected to the liquid storage tanks; The temperature regulating mechanism is used to regulate the temperature of the liquid in at least two of the liquid storage tanks.

2. The liquid delivery system according to claim 1, characterized in that: The temperature regulating mechanism comprises a heating pool and a heating element. The heating pool stores a heating medium. At least two liquid storage tanks are arranged in the heating pool, and the liquid storage tanks are at least partially immersed in the heating medium. The heating element is arranged in the heating pool.

3. The liquid delivery system according to claim 2, characterized in that: The temperature adjustment mechanism further includes a temperature detector, which is disposed in the heating pool.

4. The liquid delivery system according to claim 1, characterized in that: The pressurizing mechanism includes an air source and at least two groups of air intake components connected to the air source, and each of the air intake components is connected to a corresponding liquid storage tank to connect or cut off the air source and the liquid storage tank.

5. The liquid delivery system according to claim 4, characterized in that: The air intake assembly comprises an air intake pipe and an air intake valve. Both ends of the air intake pipe are respectively connected to the air source and the liquid storage tank. The air intake valve is arranged on the air intake pipe.

6. The liquid delivery system according to claim 5, characterized in that: The air intake assembly further includes a pressure reducing valve and a pressure detector. The pressure reducing valve and the pressure detector are both arranged in the air intake pipe, and the pressure detector is arranged between the pressure reducing valve and the liquid storage tank.

7. The liquid delivery system according to claim 1, characterized in that: The liquid discharge mechanism includes a liquid collecting pipe and at least two connecting pipes, one end of the at least two connecting pipes is connected to at least two liquid storage tanks in a one-to-one correspondence, and the other end is connected to the liquid collecting pipe, and the liquid collecting pipe is provided with a liquid outlet for liquid discharge; The liquid outlet mechanism further includes at least two liquid outlet valves, and each of the liquid outlet valves is correspondingly arranged on one of the connecting pipes.

8. The liquid delivery system according to claim 7, characterized in that: The liquid outlet mechanism further comprises a liquid outlet head, one end of which is connected to the liquid collecting pipe and communicated with the liquid outlet.

9. The liquid delivery system according to any one of claims 1 to 8, characterized in that: It also includes a liquid supply mechanism and at least two exhaust mechanisms. At least two of the liquid storage tanks can be alternately connected to the liquid supply mechanism, and the liquid supply mechanism can input liquid into the liquid storage tanks connected thereto; each of the exhaust mechanisms is connected to a corresponding liquid storage tank.

10. The liquid delivery system according to claim 9, characterized in that: The liquid supply mechanism includes a liquid source, at least two liquid supply pipes and at least two liquid supply valves. Both ends of each of the liquid supply pipes are respectively connected to the liquid source and a corresponding liquid storage tank. Each of the liquid supply valves is arranged on a corresponding liquid supply pipe.

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