Liquid delivery device

Abstract

The utility model provides a liquid conveying device. The liquid conveying device comprises a plurality of liquid storage tanks; the liquid conveying pipeline is provided with a first liquid inlet and a first liquid outlet, and the first liquid inlet is selectively connected with one of the liquid storage tanks; the detection pipeline is provided with a second liquid inlet and a second liquid outlet, and the second liquid inlet is communicated with the liquid conveying pipeline; the detection part is arranged on the detection pipeline; and the cleaning pipeline is communicated with the detection pipeline and located at the upstream of the detection piece, and the cleaning pipeline is used for cleaning the detection piece. According to the technical scheme, the problem that the detection result of the liquid is affected due to the fact that crystallization is prone to occurring in the detection piece in the related technology is effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of liquid conveying equipment, and more specifically, to a liquid conveying device. Background Art

[0002] When conveying liquid, it is necessary to detect the concentration of the liquid. The liquid conveying device in the related art includes an infusion pipeline, and a detection component is arranged on the infusion pipeline. However, since the liquid is a supersaturated solution, when the external environment changes, such as when the external temperature or external pressure changes, crystallization is likely to occur inside the detection component, resulting in deviation of the detection data of the liquid by the detection component, thereby affecting the detection result of the liquid by the detection component. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide a liquid conveying device to solve the problem that crystallization easily occurs inside the detection component in the related art, affecting the detection result of the liquid.

[0004] To achieve the above purpose, the utility model provides a liquid conveying device, including: a plurality of liquid storage tanks; an infusion pipeline having a first liquid inlet and a first liquid outlet, and the first liquid inlet is selectively connected to one of the plurality of liquid storage tanks; a detection pipeline having a second liquid inlet and a second liquid outlet, and the second liquid inlet is communicated with the infusion pipeline; a detection component arranged on the detection pipeline; a cleaning pipeline communicated with the detection pipeline and located upstream of the detection component, and the cleaning pipeline cleans the detection component.

[0005] Further, the liquid conveying device further includes a reversing valve, and the plurality of liquid storage tanks are all communicated with the first liquid inlet through the reversing valve.

[0006] Further, the liquid conveying device further includes a recovery pipeline communicated with the detection pipeline, and the connection point between the recovery pipeline and the detection pipeline is located between the infusion pipeline and the cleaning pipeline, and the recovery pipeline is used to recover the cleaning liquid inside the detection component.

[0007] Further, the height of the detection component is higher than the height of the third liquid inlet of the recovery pipeline, and the third liquid inlet of the recovery pipeline is the connection port between the recovery pipeline and the detection pipeline.

[0008] Further, the liquid conveying device further includes a waste liquid tank and a waste liquid pump, the waste liquid tank is arranged on the recovery pipeline, and the waste liquid pump conveys the waste liquid in the waste liquid tank to the first liquid outlet.

[0009] Further, the liquid conveying device further includes a first ball valve arranged between the third liquid inlet of the recovery pipeline and the waste liquid tank, and the first ball valve can cut off or conduct the recovery pipeline.

[0010] Further, the liquid delivery device further includes a control member and a first liquid level detection member signal - connected to the control member. The control member is control - connected to the waste liquid pump. The first liquid level detection member is disposed in the waste liquid tank and detects the liquid level of the waste liquid tank. When the liquid level of the waste liquid tank reaches the first preset liquid level of the first liquid level detection member, the first liquid level detection member transmits a first liquid level signal to the control member, and the control member controls the waste liquid pump to start to discharge the liquid in the waste liquid tank.

[0011] Further, the liquid delivery device further includes a second liquid level detection member signal - connected to the control member. The second liquid level detection member is disposed in the waste liquid tank and below the first liquid level detection member. The second liquid level detection member detects the liquid level of the waste liquid tank. When the liquid level of the waste liquid tank reaches the second preset liquid level of the second liquid level detection member, the second liquid level detection member transmits a second liquid level signal to the control member, and the control member controls the waste liquid pump to stop.

[0012] Further, the liquid delivery device further includes a second ball valve disposed on the liquid delivery pipeline. The second ball valve is downstream of the second liquid inlet, and the second ball valve can cut off or conduct the liquid delivery pipeline.

[0013] Further, the liquid delivery device further includes a third ball valve disposed on the detection pipeline. The third ball valve is upstream of the connection between the cleaning pipeline and the detection pipeline, and the third ball valve can cut off or conduct the detection pipeline.

[0014] Applying the technical solution of the present utility model, the liquid delivery device includes: a plurality of liquid storage tanks, a liquid delivery pipeline, a detection pipeline, a detection member, and a cleaning pipeline. The liquid delivery pipeline has a first liquid inlet and a first liquid outlet, and the first liquid inlet is selectively connected to one of the plurality of liquid storage tanks. The detection pipeline has a second liquid inlet and a second liquid outlet, and the second liquid inlet is connected to the liquid delivery pipeline. The detection member is disposed on the detection pipeline. In this way, the liquid delivery pipeline can deliver the liquid in multiple liquid storage tanks, and the detection pipeline can detect the liquid in multiple liquid storage tanks, reducing the cost of liquid delivery and detection. And, by separately setting the liquid delivery pipeline, when the liquid does not need to be detected, the liquid can be delivered through the liquid delivery pipeline. When the liquid needs to be detected, the liquid is delivered to the detection pipeline. This reduces the time for the liquid to pass through the detection pipeline, and thus reduces the time for the liquid to flow through the detection member, reducing the crystallization in the detection member. The cleaning pipeline is connected to the detection pipeline and upstream of the detection member, and the cleaning pipeline cleans the detection member. The setting of the cleaning pipeline can clean the detection member, thereby further reducing the time of the liquid in the detection member and further reducing the crystallization in the detection member. Therefore, the technical solution of the present application effectively solves the problem that crystallization easily occurs in the detection member in the related art, affecting the liquid detection result. Description of the Drawings

[0015] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0016] Figure 1 A connection schematic diagram of an embodiment of a liquid delivery device according to the present utility model is shown.

[0017] Among them, the above-mentioned drawings include the following reference numerals:

[0018] 10. Infusion pipeline; 11. First liquid inlet; 12. First liquid outlet; 13. Second ball valve;

[0019] 20. Detection pipeline; 21. Detection piece; 22. Third ball valve; 23. Second liquid outlet;

[0020] 30. Cleaning pipeline;

[0021] 40. Recovery pipeline; 41. Third liquid inlet; 42. Waste liquid tank; 43. Waste liquid pump; 44. First ball valve; 45. First liquid level detection piece; 46. Second liquid level detection piece;

[0022] 50. Liquid storage tank; 60. Directional valve. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0024] It should be noted that the terms used here are only for describing the specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0026] As Figure 1 shown, applying the technical solution of this embodiment, the liquid delivery device includes: a plurality of liquid storage tanks 50, an infusion pipeline 10, a detection pipeline 20, a detection member 21, and a cleaning pipeline 30. The infusion pipeline 10 has a first liquid inlet 11 and a first liquid outlet 12, and the first liquid inlet 11 is selectively connected to one of the plurality of liquid storage tanks 50. The detection pipeline 20 has a second liquid inlet and a second liquid outlet 23, and the second liquid inlet communicates with the infusion pipeline 10. The detection member 21 is disposed on the detection pipeline 20. The cleaning pipeline 30 communicates with the detection pipeline 20 and is located upstream of the detection member 21, and the cleaning pipeline 30 cleans the detection member 21.

[0027] In this way, the infusion pipeline 10 can deliver the liquid in the plurality of infusion tanks, and the detection pipeline 20 can detect the liquid in the plurality of infusion tanks, reducing the costs of liquid delivery and detection. Moreover, by separately providing the infusion pipeline 10, when the liquid does not need to be detected, the liquid can be delivered through the infusion pipeline 10. When the liquid needs to be detected, the liquid is delivered into the detection pipeline 20. This reduces the time for the liquid to pass through the detection pipeline 20, and thus reduces the time for the liquid to flow through the detection member 21, reducing the occurrence of crystallization in the detection member 21. The cleaning pipeline 30 communicates with the detection pipeline 20 and is located upstream of the detection member 21, and the cleaning pipeline 30 cleans the detection member 21. The provision of the cleaning pipeline 30 can clean the detection member 21, thereby further reducing the time for the liquid in the detection member 21, and further reducing the occurrence of crystallization in the detection member 21. Therefore, the technical solution of this embodiment effectively solves the problem in the related art that crystallization easily occurs in the detection member, affecting the detection result of the liquid.

[0028] The inventor found that in the related art, the liquid storage tanks correspond to the detection components one by one through the liquid infusion pipelines. In this way, when there are many liquid storage tanks, multiple detection components are required to detect the liquids in the multiple liquid storage tanks. Since the cost of the detection components is relatively high, such a setting increases the detection cost.

[0029] Applying the technical solution of this embodiment, the liquids in multiple liquid storage tanks 50 can all be detected by one detection component 21, reducing the number of detection components 21 and lowering the detection cost. In this embodiment, after the liquid in one liquid storage tank 50 enters the detection pipeline 20 for detection, the cleaning pipeline 30 cleans the detection component 21, and then the liquid in other liquid storage tanks 50 is conveyed into the detection pipeline 20 for detection. In this way, before replacing the liquid storage tank 50, cleaning the detection component 21 can flush the residual liquid in the detection component 21 to improve the accuracy during the next liquid detection.

[0030] As Figure 1 shown, the liquid conveying device further includes a reversing valve 60. Multiple liquid storage tanks 50 are all connected to the first liquid inlet 11 through the reversing valve 60. The setting of the reversing valve 60 facilitates the selectively connection between the first liquid inlet 11 and multiple liquid storage tanks 50, which is convenient for operation.

[0031] As Figure 1 shown, the liquid conveying device further includes a recovery pipeline 40 connected to the detection pipeline 20. The connection between the recovery pipeline 40 and the detection pipeline 20 is located between the liquid infusion pipeline 10 and the cleaning pipeline 30. The recovery pipeline 40 is used to recover the cleaning liquid in the detection component 21. The setting of the recovery pipeline 40 can recover the residual liquid when the cleaning pipeline 30 cleans the detection component 21, so that the detection component 21 can better receive the liquid to be detected next time, thereby improving the detection accuracy.

[0032] As Figure 1 shown, the height of the detection component 21 is higher than the height of the third liquid inlet 41 of the recovery pipeline 40. The third liquid inlet 41 of the recovery pipeline 40 is the connection port between the recovery pipeline 40 and the detection pipeline 20. This enables the residual cleaning liquid in the detection component 21 to smoothly enter the recovery pipeline 40, further facilitating the discharge of the residual cleaning liquid in the detection component 21.

[0033] As Figure 1 shown, the liquid conveying device further includes a waste liquid tank 42 and a waste liquid pump 43. The waste liquid tank 42 is arranged on the recovery pipeline 40, and the waste liquid pump 43 conveys the waste liquid in the waste liquid tank 42 to the first liquid outlet 12. The waste liquid tank 42 can recover the cleaning liquid in the recovery pipeline 40, and the waste liquid pump 43 facilitates the discharge of the cleaning liquid in the waste liquid tank 42.

[0034] As Figure 1As shown, the liquid delivery device further includes a first ball valve 44 disposed between the third liquid inlet 41 of the recovery pipeline 40 and the waste liquid tank 42. The first ball valve 44 can cut off or conduct the recovery pipeline 40. When the liquid flows through the detection pipeline 20, the first ball valve 44 cuts off the recovery pipeline 40 to prevent the liquid from entering the waste liquid tank 42 through the recovery pipeline 40. After the detection member 21 is cleaned, the first ball valve 44 conducts the recovery pipeline 40 so that the residual cleaning liquid in the detection member 21 can flow into the waste liquid tank 42 through the detection pipeline 20 and the recovery pipeline 40.

[0035] As Figure 1 shown, the liquid delivery device further includes a control member and a first liquid level detection member 45 signal-connected to the control member. The control member is control-connected to the waste liquid pump 43. The first liquid level detection member 45 is disposed in the waste liquid tank 42 and detects the liquid level of the waste liquid tank 42. When the liquid level of the waste liquid tank 42 reaches the first preset liquid level of the first liquid level detection member 45, the first liquid level detection member 45 transmits a first liquid level signal to the control member, and the control member controls the waste liquid pump 43 to start to discharge the liquid in the waste liquid tank 42. In this way, when the waste liquid in the waste liquid tank 42 reaches the first preset liquid level of the first liquid level detection member 45, the control member can timely start the waste liquid pump 43, reducing the possibility of the waste liquid in the waste liquid tank 42 overflowing. And it reduces the situation of power waste caused by the continuous operation of the waste liquid pump 43.

[0036] As Figure 1 shown, the liquid delivery device further includes a second liquid level detection member 46 signal-connected to the control member. The second liquid level detection member 46 is disposed in the waste liquid tank 42 and is located below the first liquid level detection member 45. The second liquid level detection member 46 detects the liquid level of the waste liquid tank 42. When the liquid level of the waste liquid tank 42 reaches the second preset liquid level of the second liquid level detection member 46, the second liquid level detection member 46 transmits a second liquid level signal to the control member, and the control member controls the waste liquid pump 43 to stop. In this way, when the waste liquid in the waste liquid tank 42 reaches the second preset liquid level of the second liquid level detection member 46, the control member can timely stop the waste liquid pump 43, reducing the situation of the waste liquid pump 43 idling due to the too low liquid level in the waste liquid tank 42 and improving the service life of the waste liquid pump 43.

[0037] As Figure 1 shown, the liquid delivery device further includes a second ball valve 13 disposed on the infusion pipeline 10. The second ball valve 13 is located downstream of the second liquid inlet, and the second ball valve 13 can cut off or conduct the infusion pipeline 10. In this way, when the liquid in the infusion pipeline 10 does not need to be detected, the second ball valve 13 conducts the infusion pipeline 10 so that the liquid in the infusion pipeline 10 can be delivered to the first liquid outlet 12. When the liquid in the infusion pipeline 10 needs to be detected, the second ball valve 13 cuts off the infusion pipeline 10 to facilitate the delivery of the liquid in the infusion pipeline 10 into the detection pipeline 20.

[0038] As Figure 1 shown, the liquid delivery device further includes a third ball valve 22 disposed on the detection pipeline 20. The third ball valve 22 is located upstream of the connection between the cleaning pipeline 30 and the detection pipeline 20, and the third ball valve 22 can cut off or conduct the detection pipeline 20. Thus, when the liquid in the infusion pipeline 10 does not need to be detected, the third ball valve 22 cuts off the detection pipeline 20 to facilitate the delivery of the liquid in the infusion pipeline 10 to the first liquid outlet 12. When the liquid in the infusion pipeline 10 needs to be detected, the third ball valve 22 conducts the detection pipeline 20 so that the liquid in the infusion pipeline 10 can be delivered into the detector 21 through the detection pipeline 20.

[0039] In this embodiment, a fourth ball valve and a first check valve are further disposed on the recovery pipeline 40 downstream of the waste liquid pump 43, and the fourth ball valve is located upstream of the first check valve. The fourth ball valve can cut off or conduct the recovery pipeline 40. A fifth ball valve and a second check valve are further disposed on the detection pipeline 20 downstream of the detector 21, and the fifth ball valve is located upstream of the second check valve. The fifth ball valve can cut off or conduct the detection pipeline 20. A sixth ball valve is disposed on the cleaning pipeline 30, and the sixth ball valve can cut off or conduct the cleaning pipeline 30.

[0040] In this embodiment, the liquid delivery device is used for potassium fertilizer detection. The detector 21 is a mass flowmeter, and the mass flowmeter can measure the mass density of the slurry to calculate the volume concentration of the slurry.

[0041] Crystallization occurs in the mass flowmeter in the related art, which easily causes large fluctuations in the online analysis data of the slurry concentration. The real-time concentration of the slurry cannot be accurately obtained through calculation, which easily affects the production process. Applying the technical solution of this embodiment, by regularly cleaning the mass flowmeter, the data measured online by the mass flowmeter is stable and accurate, and finally the stability and accuracy of the analysis data of the slurry volume concentration are ensured.

[0042] In this embodiment, the plurality of liquid storage tanks 50 include a tank A and a tank B. The control system of the liquid delivery device is divided into two control modes: a manual control mode and an automatic control mode.

[0043] In the manual control mode, the first ball valve 44, the second ball valve 13, the third ball valve 22, the fourth ball valve, and the fifth ball valve can be arbitrarily opened or closed.

[0044] In the automatic control mode, the control system can operate automatically according to the set program. First, select to measure the slurry in Tank A or the slurry in Tank B on the touch screen of the control device. Then start the set program. The reversing valve 60 is connected to Tank A, the first ball valve 44 is closed, the second ball valve 13 is closed, the third ball valve 22 is opened, the sixth ball valve is closed, and the slurry in Tank A is transported through the infusion pipeline 10 into the detecting element 21 of the detecting pipeline 20. After a preset delay time, the detecting element 21 detects the liquid. After the measurement of the slurry in Tank A is completed, close the third ball valve 22, open the sixth ball valve, and flush the mass flowmeter. While opening the sixth ball valve, switch the reversing valve 60 to the position connected to Tank B. After the mass flowmeter is flushed, close the sixth ball valve, open the first ball valve 44, and discharge the residual slurry in the mass flowmeter.

[0045] Since the slurries in Tank A and Tank B need to enter the same measuring pipeline for measurement, to ensure the accuracy and stability of the measurement data, after opening the third ball valve 22, it is necessary to delay for a period of time before reading the data of the mass flowmeter. On the control device, it is possible to select to measure the slurry in Tank A or the slurry in Tank B, and the monitoring value of the mass flowmeter can be displayed in real time, and the on-off states of the first ball valve 44, the second ball valve 13, the third ball valve 22, the fourth ball valve, and the fifth ball valve can be displayed. The control device has a data recording function, which can record the measured values and the relevant data can be queried at any time.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0047] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0048] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0049] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A liquid delivery device, characterized in that, Comprising: A plurality of liquid storage tanks (50); An infusion pipeline (10) having a first liquid inlet (11) and a first liquid outlet (12), and the first liquid inlet (11) is selectively connected to one of the plurality of liquid storage tanks (50); A detection pipeline (20) having a second liquid inlet and a second liquid outlet (23), and the second liquid inlet communicates with the infusion pipeline (10); A detection member (21) provided on the detection pipeline (20); A cleaning pipeline (30) communicating with the detection pipeline (20) and located upstream of the detection member (21), and the cleaning pipeline (30) cleans the detection member (21).

2. The liquid delivery device according to claim 1, wherein The liquid delivery device further includes a reversing valve (60), and the plurality of liquid storage tanks (50) are all communicated with the first liquid inlet (11) through the reversing valve (60).

3. The liquid delivery device according to claim 1, wherein The liquid delivery device further includes a recovery pipeline (40) communicating with the detection pipeline (20), and the connection between the recovery pipeline (40) and the detection pipeline (20) is located between the infusion pipeline (10) and the cleaning pipeline (30), and the recovery pipeline (40) is used to recover the cleaning liquid in the detection member (21).

4. The liquid delivery device according to claim 3, wherein The height of the detection member (21) is higher than the height of the third liquid inlet (41) of the recovery pipeline (40), and the third liquid inlet (41) of the recovery pipeline (40) is the connection port between the recovery pipeline (40) and the detection pipeline (20).

5. The liquid delivery device according to claim 3, wherein, The liquid delivery device further includes a waste liquid tank (42) and a waste liquid pump (43), the waste liquid tank (42) is provided on the recovery pipeline (40), and the waste liquid pump (43) transports the waste liquid in the waste liquid tank (42) to the first liquid outlet (12).

6. The liquid delivery device according to claim 5, characterized in that, The liquid delivery device further includes a first ball valve (44) provided between the third liquid inlet (41) of the recovery pipeline (40) and the waste liquid tank (42), and the first ball valve (44) can cut off or conduct the recovery pipeline (40).

7. The liquid delivery device according to claim 5, wherein The liquid delivery device further includes a control member and a first liquid level detection member (45) signal-connected to the control member, the control member is control-connected to the waste liquid pump (43), and the first liquid level detection member (45) is provided in the waste liquid tank (42) and detects the liquid level of the waste liquid tank (42); when the liquid level of the waste liquid tank (42) reaches the first preset liquid level of the first liquid level detection member (45), the first liquid level detection member (45) transmits a first liquid level signal to the control member, and the control member controls the waste liquid pump (43) to start to discharge the liquid in the waste liquid tank (42).

8. The liquid delivery device according to claim 7, characterized in that, The liquid delivery device further includes a second liquid level detector (46) signal - connected to the control member. The second liquid level detector (46) is disposed in the waste liquid tank (42) and below the first liquid level detector (45), and the second liquid level detector (46) detects the liquid level of the waste liquid tank (42). When the liquid level of the waste liquid tank (42) reaches the second preset liquid level of the second liquid level detector (46), the second liquid level detector (46) transmits a second liquid level signal to the control member, and the control member controls the waste liquid pump (43) to stop.

9. The liquid delivery device according to claim 1, characterized in that, The liquid delivery device further includes a second ball valve (13) disposed on the infusion pipeline (10). The second ball valve (13) is located downstream of the second liquid inlet, and the second ball valve (13) can cut off or conduct the infusion pipeline (10).

10. The liquid delivery device according to claim 1, characterized in that, The liquid delivery device further includes a third ball valve (22) disposed on the detection pipeline (20). The third ball valve (22) is located upstream of the connection between the cleaning pipeline (30) and the detection pipeline (20), and the third ball valve (22) can cut off or conduct the detection pipeline (20).

Images